/* ============================================================
   RequestKit Design System
   Modern dev-tool CSS with --rk- variable prefix
   ============================================================ */

/* --- Root Variables --- */
:root {
    --rk-primary: #2563EB;
    --rk-primary-hover: #1D4FD7;
    --rk-primary-light: #EFF6FF;
    --rk-text: #1E293B;
    --rk-text-secondary: #64748B;
    --rk-text-muted: #64748B;
    --rk-border: #E2E8F0;
    --rk-surface: #F8FAFC;
    --rk-white: #FFFFFF;
    --rk-success: #16A34A;
    --rk-success-light: #F0FDF4;
    --rk-error: #DC2626;
    --rk-error-light: #FEF2F2;
    --rk-warning: #D97706;
    --rk-warning-light: #FFFBEB;
    --rk-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --rk-shadow-md: 0 6px 16px rgba(0, 0, 0, 0.1);
    --rk-shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.15);
    --rk-radius-sm: 0;
    --rk-radius-md: 0;
    --rk-radius-lg: 0;
    --rk-font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --rk-font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
    font-family: var(--rk-font-sans);
    font-size: 14px;
    color: var(--rk-text);
    background: var(--rk-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
::selection { background: var(--rk-primary); color: var(--rk-white); }
:focus-visible { outline: 2px solid var(--rk-primary); outline-offset: 1px; }
.rk-route-focus:focus,
.rk-route-focus:focus-visible { outline: none; }

/* --- App Shell --- */
.rk-app { display: flex; flex-direction: column; height: 100vh; }
.rk-body { flex: 1; min-height: 0; overflow: auto; position: relative; }

/* --- Top Bar --- */
.rk-topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: 78px;
    padding: 12px 16px;
    border-bottom: 1px solid var(--rk-border);
    background: linear-gradient(180deg, #FFFEFB 0%, #FFFFFF 100%);
    z-index: 100;
}
.rk-topbar-left,
.rk-topbar-right {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
}
.rk-topbar-left {
    flex: 0 1 320px;
}
.rk-topbar-right {
    flex: 1;
    justify-content: flex-end;
}
.rk-topbar-center {
    display: flex;
    align-items: stretch;
    gap: 2px;
    padding: 4px;
    border: 1px solid var(--rk-border);
    background: rgba(248, 250, 252, 0.92);
    box-shadow: var(--rk-shadow-sm);
}
.rk-brand-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0;
    border: none;
    background: transparent;
    color: inherit;
    cursor: pointer;
    text-align: left;
    font-family: var(--rk-font-sans);
}
.rk-logo-mark {
    width: 42px;
    height: 42px;
    display: block;
    object-fit: cover;
    box-shadow: var(--rk-shadow-sm);
    flex-shrink: 0;
}
.rk-logo-stack {
    display: flex;
    flex-direction: column;
    gap: 3px;
    min-width: 0;
}
.rk-logo {
    font-size: 18px;
    font-weight: 800;
    color: var(--rk-text);
    letter-spacing: -0.04em;
    line-height: 1;
}
.rk-logo-subtitle {
    font-size: 12px;
    color: var(--rk-text-secondary);
    line-height: 1.3;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.rk-mode-tab {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    min-width: 116px;
    padding: 9px 14px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 13px;
    font-weight: 500;
    color: var(--rk-text-secondary);
    border-radius: var(--rk-radius-md);
    transition: all 0.15s ease;
    font-family: var(--rk-font-sans);
}
.rk-mode-tab:hover { color: var(--rk-text); background: var(--rk-white); }
.rk-mode-tab.active {
    color: var(--rk-text);
    background: var(--rk-white);
    box-shadow: var(--rk-shadow-md);
    font-weight: 600;
}
.rk-mode-tab-label {
    font-size: 13px;
    font-weight: 700;
    line-height: 1.2;
}
.rk-mode-tab-hint {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--rk-text-muted);
}
.rk-mode-tab.active .rk-mode-tab-hint {
    color: var(--rk-primary);
}
.rk-topbar-status {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border: 1px solid var(--rk-border);
    background: var(--rk-surface);
    font-size: 12px;
    font-weight: 600;
    color: var(--rk-text-secondary);
    white-space: nowrap;
}
.rk-topbar-status.is-ready {
    background: #F8FAFC;
}
.rk-topbar-status.is-saving {
    background: #DBEAFE;
    color: var(--rk-primary);
    border-color: rgba(37, 99, 235, 0.18);
}
.rk-topbar-status.is-dirty {
    background: #FEF3C7;
    color: #92400E;
    border-color: rgba(217, 119, 6, 0.2);
}
.rk-topbar-status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--rk-success);
    flex-shrink: 0;
}
.rk-topbar-status.is-saving .rk-topbar-status-dot {
    background: var(--rk-primary);
}
.rk-topbar-status.is-dirty .rk-topbar-status-dot {
    background: var(--rk-warning);
}
.rk-topbar-workspace {
    display: flex;
    flex-direction: column;
    gap: 4px;
    flex: 0 1 260px;
    min-width: 220px;
}
.rk-topbar-field-label {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--rk-text-muted);
}
.rk-topbar-workspace-input {
    min-width: 0;
    font-weight: 600;
}
.rk-topbar-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

/* --- Status Bar --- */
.rk-statusbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    min-height: 44px;
    padding: 8px 16px;
    border-top: 1px solid var(--rk-border);
    background: linear-gradient(180deg, #FFFFFF 0%, #F8FAFC 100%);
    font-size: 12px;
    color: var(--rk-text-muted);
    flex-wrap: wrap;
}
.rk-statusbar-left,
.rk-statusbar-center,
.rk-statusbar-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    min-width: 0;
}
.rk-statusbar-right {
    justify-content: flex-end;
}
.rk-status-pill,
.rk-status-chip {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 10px;
    border: 1px solid var(--rk-border);
    background: var(--rk-white);
    white-space: nowrap;
}
.rk-status-pill {
    font-weight: 700;
    color: var(--rk-text-secondary);
}
.rk-status-pill.is-ready {
    background: #F8FAFC;
}
.rk-status-pill.is-saving {
    background: #DBEAFE;
    color: var(--rk-primary);
    border-color: rgba(37, 99, 235, 0.18);
}
.rk-status-pill.is-dirty {
    background: #FEF3C7;
    color: #92400E;
    border-color: rgba(217, 119, 6, 0.2);
}
.rk-status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--rk-success);
    flex-shrink: 0;
}
.rk-status-pill.is-saving .rk-status-dot {
    background: var(--rk-primary);
}
.rk-status-pill.is-dirty .rk-status-dot {
    background: var(--rk-warning);
}
.rk-status-chip {
    color: var(--rk-text-secondary);
}
.rk-sep { color: var(--rk-border); }

/* --- Workbench Layout --- */
.rk-workbench { display: flex; flex-direction: row; height: 100%; min-height: 0; }
.rk-sidebar {
    width: 280px; min-width: 280px; border-right: 1px solid var(--rk-border);
    background: var(--rk-surface); display: flex; flex-direction: column; overflow: hidden;
}
.rk-main {
    flex: 1; min-width: 0; display: flex; flex-direction: column; overflow: hidden;
    background-image: radial-gradient(circle, var(--rk-border) 1px, transparent 1px);
    background-size: 24px 24px; background-position: 12px 12px;
}
.rk-panel {
    width: 320px; min-width: 320px; border-left: 1px solid var(--rk-border);
    background: var(--rk-white); display: flex; flex-direction: column; overflow: hidden;
}

/* --- Buttons --- */
.rk-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 9px 18px; border: 1px solid var(--rk-border); border-radius: var(--rk-radius-md);
    background: var(--rk-white); color: var(--rk-text); font-size: 13px; font-weight: 600;
    cursor: pointer; transition: all 0.15s ease; font-family: var(--rk-font-sans);
    box-shadow: var(--rk-shadow-sm); white-space: nowrap;
}
.rk-btn:hover { border-color: #CBD5E1; box-shadow: var(--rk-shadow-md); transform: translateY(-1px); }
.rk-btn:active { transform: translateY(0); box-shadow: var(--rk-shadow-sm); }
.rk-btn-primary {
    background: var(--rk-primary); border-color: var(--rk-primary); color: var(--rk-white);
}
.rk-btn-primary:hover { background: var(--rk-primary-hover); border-color: var(--rk-primary-hover); }
.rk-btn-danger { background: var(--rk-error); border-color: var(--rk-error); color: var(--rk-white); }
.rk-btn-danger:hover { background: #B91C1C; border-color: #B91C1C; }
.rk-btn-sm { padding: 6px 12px; font-size: 12px; }
.rk-btn-lg { padding: 12px 24px; font-size: 15px; }
.rk-btn-icon {
    padding: 6px; width: 36px; height: 36px; border: none; background: transparent;
    color: var(--rk-text-secondary); border-radius: var(--rk-radius-sm);
    box-shadow: none; cursor: pointer; display: inline-flex; align-items: center; justify-content: center;
}
.rk-btn-icon:hover { background: var(--rk-surface); color: var(--rk-text); transform: none; box-shadow: none; }

/* --- Inputs --- */
.rk-input, .rk-select, .rk-textarea {
    padding: 9px 12px; border: 1px solid var(--rk-border); border-radius: var(--rk-radius-md);
    background: var(--rk-white); color: var(--rk-text); font-size: 13px;
    font-family: var(--rk-font-sans); transition: border-color 0.15s, box-shadow 0.15s;
    width: 100%;
}
.rk-input:focus, .rk-select:focus, .rk-textarea:focus {
    outline: none; border-color: var(--rk-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12), 0 0 0 2px rgba(99, 102, 241, 0.3);
}
.rk-input::placeholder, .rk-textarea::placeholder { color: var(--rk-text-muted); }
.rk-textarea { resize: vertical; min-height: 100px; font-family: var(--rk-font-mono); font-size: 13px; }
.rk-select { cursor: pointer; appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' stroke='%2394A3B8' fill='none' stroke-width='1.5'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 8px center; padding-right: 28px; }

/* --- Method Badges --- */
.rk-method { font-size: 11px; font-weight: 700; letter-spacing: 0.5px; padding: 3px 8px; border-radius: 0; font-family: var(--rk-font-mono); text-transform: uppercase; }
.rk-method-get { color: #16A34A; background: #F0FDF4; }
.rk-method-post { color: #2563EB; background: #EFF6FF; }
.rk-method-put { color: #D97706; background: #FFFBEB; }
.rk-method-patch { color: #7C3AED; background: #F5F3FF; }
.rk-method-delete { color: #DC2626; background: #FEF2F2; }
.rk-method-head { color: #64748B; background: #F1F5F9; }
.rk-method-options { color: #64748B; background: #F1F5F9; }

/* --- URL Bar --- */
.rk-url-bar {
    display: flex; align-items: center; gap: 0;
    border: 1px solid var(--rk-border); border-radius: var(--rk-radius-lg);
    background: var(--rk-white); box-shadow: var(--rk-shadow-sm);
    overflow: hidden;
}
.rk-url-bar .rk-select {
    width: auto; min-width: 100px; border: none; border-right: 1px solid var(--rk-border);
    border-radius: 0; font-weight: 600; font-size: 13px; font-family: var(--rk-font-mono);
    box-shadow: none;
}
.rk-url-bar .rk-select:focus { box-shadow: none; }
.rk-url-bar .rk-input {
    flex: 1; border: none; border-radius: 0; font-family: var(--rk-font-mono);
    font-size: 14px; box-shadow: none;
}
.rk-url-bar .rk-input:focus { box-shadow: none; }
.rk-url-bar .rk-btn {
    border: none; border-left: 1px solid var(--rk-border); border-radius: 0;
    min-width: 84px; height: 100%; box-shadow: none;
}

/* --- Key-Value Editor --- */
.rk-kv-row {
    display: flex; align-items: center; gap: 4px; padding: 4px 0;
    border-bottom: 1px solid var(--rk-surface);
}
.rk-kv-key, .rk-kv-value {
    flex: 1; padding: 7px 10px; border: 1px solid transparent; border-radius: var(--rk-radius-sm);
    font-size: 13px; font-family: var(--rk-font-mono); background: transparent;
    color: var(--rk-text); transition: border-color 0.15s;
}
.rk-kv-key:focus, .rk-kv-value:focus { border-color: var(--rk-primary); outline: none; box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.3); }
.rk-kv-key::placeholder, .rk-kv-value::placeholder { color: var(--rk-text-muted); }
.rk-kv-toggle { width: 16px; height: 16px; accent-color: var(--rk-primary); cursor: pointer; }
.rk-kv-delete {
    width: 24px; height: 24px; border: none; background: transparent;
    color: var(--rk-text-muted); cursor: pointer; border-radius: var(--rk-radius-sm);
    display: flex; align-items: center; justify-content: center; font-size: 14px;
}
.rk-kv-delete:hover { color: var(--rk-error); background: var(--rk-error-light); }

/* --- Tab Panels --- */
.rk-tab-bar {
    display: flex; align-items: center; gap: 0;
    border-bottom: 1px solid var(--rk-border); padding: 0 12px;
    background: var(--rk-white);
}
.rk-tab {
    padding: 12px 18px; border: none; background: transparent; cursor: pointer;
    font-size: 13px; font-weight: 500; color: var(--rk-text-secondary);
    border-bottom: 2px solid transparent; transition: all 0.15s ease;
    font-family: var(--rk-font-sans);
}
.rk-tab:hover { color: var(--rk-text); }
.rk-tab.active { color: var(--rk-primary); border-bottom-color: var(--rk-primary); font-weight: 700; }
.rk-tab-content { padding: 16px; overflow: auto; flex: 1; }

/* --- Collection Sidebar --- */
.rk-collection-tree { flex: 1; overflow-y: auto; padding: 8px; }
.rk-tree-item {
    display: flex; align-items: center; gap: 6px; padding: 8px 10px;
    border-radius: var(--rk-radius-sm); cursor: pointer; font-size: 13px;
    transition: background 0.1s; user-select: none;
    border: none; background: transparent; text-align: left; width: 100%;
    font-family: inherit; color: inherit;
}
.rk-tree-item:hover { background: var(--rk-white); }
.rk-tree-item.active { background: var(--rk-primary-light); color: var(--rk-primary); }
.rk-tree-folder { font-weight: 600; color: var(--rk-text); }
.rk-tree-request { color: var(--rk-text-secondary); padding-left: 20px; }

/* --- History Panel --- */
.rk-history-item {
    display: flex; align-items: center; gap: 8px; padding: 10px 14px;
    border: none; cursor: pointer;
    font-size: 13px; transition: background 0.1s;
    background: transparent; text-align: left; width: 100%; flex: 1;
    font-family: inherit; color: inherit;
}
.rk-history-item:hover { background: var(--rk-surface); }
.rk-history-item .rk-method { flex-shrink: 0; }
.rk-history-item .rk-history-url {
    flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
    color: var(--rk-text-secondary); font-family: var(--rk-font-mono); font-size: 12px;
}

/* --- CORS Notice --- */
.rk-cors-notice {
    display: flex; align-items: center; gap: 8px; padding: 8px 12px;
    background: var(--rk-primary-light); border: 1px solid #BFDBFE;
    border-radius: var(--rk-radius-md); font-size: 12px; color: var(--rk-primary);
    margin: 8px;
}

/* --- Monaco Editor Container --- */
.rk-editor-container { position: absolute; inset: 0; }

/* --- Home Page --- */
.rk-home {
    display: flex;
    flex-direction: column;
    gap: 28px;
    max-width: 1180px;
    margin: 0 auto;
    padding: 48px 32px 72px;
}
.rk-home-title {
    font-size: clamp(40px, 6vw, 68px);
    line-height: 0.96;
    font-weight: 900;
    color: var(--rk-text);
    letter-spacing: -0.06em;
}
.rk-home-subtitle {
    max-width: 56ch;
    font-size: 17px;
    color: var(--rk-text-secondary);
    margin-top: 14px;
    line-height: 1.7;
}
.rk-home-kicker {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border: 1px solid #bfdbfe;
    background: #eff6ff;
    font-size: 11px;
    font-weight: 800;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: #1d4ed8;
}
.rk-home-hero {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
    gap: 20px;
    align-items: stretch;
}
.rk-home-hero-copy,
.rk-home-hero-panel {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--rk-border);
    background: var(--rk-white);
    box-shadow: var(--rk-shadow-sm);
}
.rk-home-hero-copy {
    padding: 30px 32px 34px;
    background:
        radial-gradient(circle at top right, rgba(37, 99, 235, 0.14), transparent 34%),
        linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
}
.rk-home-hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 22px;
}
.rk-home-hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 20px;
}
.rk-home-meta-pill {
    padding: 7px 10px;
    border: 1px solid var(--rk-border);
    background: rgba(255, 255, 255, 0.92);
    font-size: 12px;
    font-weight: 700;
    color: var(--rk-text-secondary);
}
.rk-home-hero-panel {
    padding: 20px;
    background: linear-gradient(180deg, #f8fbff 0%, #ffffff 100%);
}
.rk-home-hero-panel-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
}
.rk-home-panel-label {
    font-size: 12px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--rk-text);
}
.rk-home-panel-caption {
    font-size: 12px;
    color: var(--rk-text-muted);
}
.rk-home-flow-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.rk-home-flow-step {
    padding: 16px;
    border: 1px solid var(--rk-border);
    background: var(--rk-white);
}
.rk-home-flow-step-api { border-left: 4px solid #2563eb; }
.rk-home-flow-step-regex { border-left: 4px solid #7c3aed; }
.rk-home-flow-step-diff { border-left: 4px solid #d97706; }
.rk-home-flow-step-head {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}
.rk-home-flow-badge {
    min-width: 30px;
    padding: 3px 6px;
    background: var(--rk-surface);
    border: 1px solid var(--rk-border);
    font-family: var(--rk-font-mono);
    font-size: 11px;
    font-weight: 700;
    color: var(--rk-text-secondary);
    text-align: center;
}
.rk-home-flow-title {
    font-size: 15px;
    font-weight: 800;
    color: var(--rk-text);
}
.rk-home-flow-step p {
    font-size: 13px;
    line-height: 1.6;
    color: var(--rk-text-secondary);
}
.rk-home-shell {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
    gap: 20px;
    align-items: start;
}
.rk-home-workspaces,
.rk-home-features-panel {
    border: 1px solid var(--rk-border);
    background: var(--rk-white);
    box-shadow: var(--rk-shadow-sm);
    min-width: 0;
}
.rk-home-workspaces {
    padding: 20px;
}
.rk-home-features-panel {
    padding: 20px;
    background: linear-gradient(180deg, #ffffff 0%, #fbfdff 100%);
}
.rk-home-section-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 16px;
}
.rk-home-section-copy {
    margin-top: 4px;
    font-size: 13px;
    line-height: 1.6;
    color: var(--rk-text-secondary);
}
.rk-home-empty-panel {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 20px;
    border: 1px dashed var(--rk-border);
    background: linear-gradient(180deg, #fbfdff 0%, #f8fafc 100%);
}
.rk-home-empty-title {
    font-size: 15px;
    font-weight: 800;
    color: var(--rk-text);
}
.rk-home-empty-copy {
    font-size: 13px;
    line-height: 1.6;
    color: var(--rk-text-secondary);
}
.rk-home-workspace-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.rk-section-header {
    font-size: 12px; font-weight: 600; color: var(--rk-text-muted);
    text-transform: uppercase; letter-spacing: 0.5px; padding: 16px 0 4px;
}
.rk-workspace-card {
    width: 100%;
    padding: 0;
    border: 1px solid var(--rk-border); border-radius: var(--rk-radius-lg);
    background: var(--rk-white); cursor: pointer; transition: all 0.15s ease;
    box-shadow: var(--rk-shadow-sm);
    text-align: left;
    font-family: inherit;
}
.rk-workspace-card:hover { border-color: var(--rk-primary); box-shadow: var(--rk-shadow-md); transform: translateY(-1px); }
.rk-workspace-name { font-size: 15px; font-weight: 600; color: var(--rk-text); }
.rk-workspace-meta { font-size: 13px; color: var(--rk-text-muted); margin-top: 4px; }
.rk-home-logo-large { margin-bottom: 16px; }
.rk-home-logo-large svg { filter: drop-shadow(0 4px 12px rgba(37, 99, 235, 0.3)); }
.rk-home-features {
    display: grid;
    grid-template-columns: 1fr;
    gap: 14px;
    width: 100%;
}
.rk-feature-card {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    padding: 20px;
    border: 1px solid var(--rk-border);
    border-radius: var(--rk-radius-lg);
    background: var(--rk-white);
    transition: all 0.2s ease;
}
.rk-feature-card:hover {
    border-color: var(--rk-primary);
    box-shadow: var(--rk-shadow-md);
    transform: translateY(-2px);
}
.rk-feature-icon {
    width: 44px;
    height: 44px;
    border-radius: var(--rk-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.rk-feature-icon-api { background: #EFF6FF; color: #2563EB; }
.rk-feature-icon-regex { background: #F5F3FF; color: #7C3AED; }
.rk-feature-icon-diff { background: #FFF7ED; color: #D97706; }
.rk-feature-info { flex: 1; min-width: 0; }
.rk-feature-name { font-size: 15px; font-weight: 700; color: var(--rk-text); margin-bottom: 4px; }
.rk-feature-desc { font-size: 13px; color: var(--rk-text-secondary); line-height: 1.5; }
.rk-workspace-card-inner {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 20px;
}
.rk-workspace-icon {
    width: 40px;
    height: 40px;
    border-radius: var(--rk-radius-md);
    background: var(--rk-surface);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--rk-text-secondary);
    flex-shrink: 0;
}
.rk-workspace-card:hover .rk-workspace-icon { color: var(--rk-primary); background: var(--rk-primary-light); }
.rk-home-workspace-date {
    margin-left: auto;
    flex-shrink: 0;
    font-size: 12px;
    font-weight: 700;
    color: var(--rk-text-muted);
    font-variant-numeric: tabular-nums;
}

/* --- Modals --- */
.rk-modal-overlay {
    position: fixed; inset: 0; background: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(4px); display: flex; align-items: center; justify-content: center;
    z-index: 1000; animation: rk-fade-in 0.15s ease;
}
.rk-modal {
    background: var(--rk-white); border-radius: var(--rk-radius-lg);
    box-shadow: var(--rk-shadow-lg); padding: 28px; min-width: 400px; max-width: 560px;
    width: 90%; animation: rk-scale-in 0.2s ease;
}
@keyframes rk-fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes rk-scale-in { from { opacity: 0; transform: scale(0.95); } to { opacity: 1; transform: scale(1); } }

/* --- Dropdown --- */
.rk-dropdown { position: relative; display: inline-block; }
.rk-dropdown-menu {
    position: absolute; top: 100%; left: 0; margin-top: 4px; min-width: 160px;
    background: var(--rk-white); border: 1px solid var(--rk-border);
    border-radius: var(--rk-radius-md); box-shadow: var(--rk-shadow-md);
    z-index: 500; padding: 4px; animation: rk-fade-in 0.1s ease;
}
.rk-dropdown-item {
    display: flex; align-items: center; gap: 8px; padding: 7px 10px;
    border: none; background: transparent; width: 100%; text-align: left;
    font-size: 12px; color: var(--rk-text); cursor: pointer; border-radius: var(--rk-radius-sm);
    font-family: var(--rk-font-sans);
}
.rk-dropdown-item:hover { background: var(--rk-surface); }

/* --- Loading Spinner --- */
.rk-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 24px;
    flex: 1;
    min-height: 0;
}
.rk-loading-spinner {
    width: 28px; height: 28px; border: 3px solid var(--rk-border);
    border-top-color: var(--rk-primary); border-radius: 50%;
    animation: rk-spin 0.6s linear infinite;
}
@keyframes rk-spin { to { transform: rotate(360deg); } }

/* --- Error Banner --- */
.rk-error-banner {
    display: flex; align-items: center; gap: 8px; padding: 12px 16px;
    background: var(--rk-error-light); border: 1px solid #FECACA;
    border-radius: var(--rk-radius-md); color: var(--rk-error);
    font-size: 13px; margin: 8px;
}

/* --- Empty State --- */
.rk-empty-state {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    padding: 48px 24px; color: var(--rk-text-muted); font-size: 15px;
    text-align: center; height: 100%;
}

/* --- Scrollbar --- */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--rk-border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--rk-text-muted); }

/* --- API Client Layout --- */
.rk-api-client-layout {
    display: flex;
    flex: 1;
    width: 100%;
    height: 100%;
    min-width: 0;
    min-height: 0;
    padding: 16px;
    overflow: hidden;
    background:
        linear-gradient(180deg, #FFFDF8 0%, #F8FAFC 38%, #FFFFFF 100%);
}
.rk-api-shell {
    display: flex;
    flex: 1;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    gap: 12px;
}
.rk-api-shell-hero {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
    padding: 20px 22px;
    border: 1px solid var(--rk-border);
    background: linear-gradient(135deg, #EFF6FF 0%, #FFFFFF 54%, #FFF7ED 100%);
    box-shadow: var(--rk-shadow-sm);
}
.rk-api-shell-copy {
    max-width: 760px;
}
.rk-api-shell-kicker,
.rk-api-pane-kicker,
.rk-api-shell-stat-label {
    display: inline-flex;
    align-items: center;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}
.rk-api-shell-kicker,
.rk-api-pane-kicker {
    color: var(--rk-primary);
}
.rk-api-shell-title,
.rk-api-pane-title {
    letter-spacing: -0.03em;
    color: var(--rk-text);
}
.rk-api-shell-title {
    margin-top: 8px;
    font-size: 30px;
    line-height: 1.1;
    max-width: 19ch;
}
.rk-api-shell-text,
.rk-api-pane-text {
    color: var(--rk-text-secondary);
    line-height: 1.6;
}
.rk-api-shell-text {
    margin-top: 10px;
    max-width: 66ch;
}
.rk-api-shell-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 12px;
    min-width: 360px;
}
.rk-api-shell-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px;
}
.rk-api-shell-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(180px, 1fr));
    gap: 10px;
    width: 100%;
}
.rk-api-shell-stat {
    display: flex;
    flex-direction: column;
    gap: 6px;
    padding: 14px 16px;
    border: 1px solid rgba(226, 232, 240, 0.9);
    background: rgba(255, 255, 255, 0.92);
    box-shadow: var(--rk-shadow-sm);
    min-width: 0;
}
.rk-api-shell-stat-label {
    color: var(--rk-text-muted);
}
.rk-api-shell-stat strong {
    font-size: 18px;
    line-height: 1.2;
    color: var(--rk-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.rk-api-shell-stat-meta {
    font-size: 12px;
    color: var(--rk-text-secondary);
    line-height: 1.5;
}
.rk-api-shell-body {
    display: flex;
    flex: 1;
    min-width: 0;
    min-height: 0;
    gap: 12px;
}
.rk-api-client {
    display: flex;
    flex: 1;
    width: 100%;
    height: 100%;
    min-width: 0;
    min-height: 0;
    gap: 12px;
    background: transparent;
}
.rk-api-sidebar-shell,
.rk-api-request-shell,
.rk-api-response-shell {
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    border: 1px solid var(--rk-border);
    background: var(--rk-white);
    box-shadow: var(--rk-shadow-sm);
}
.rk-api-sidebar-shell {
    width: 300px;
    min-width: 300px;
}
.rk-api-request-shell,
.rk-api-response-shell {
    flex: 1;
}
.rk-api-pane-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 14px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--rk-border);
    background: linear-gradient(180deg, #FFFDF8 0%, #FFFFFF 100%);
}
.rk-api-pane-header > div:first-child {
    flex: 1;
    min-width: 0;
}
.rk-api-pane-header-sidebar {
    background: linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);
}
.rk-api-pane-title {
    margin-top: 4px;
    font-size: 22px;
    line-height: 1.15;
}
.rk-api-pane-text {
    margin-top: 8px;
    font-size: 13px;
}
.rk-api-pane-meta-group {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
    max-width: 240px;
    min-width: 0;
}
.rk-api-pane-chip {
    display: inline-flex;
    align-items: center;
    padding: 5px 10px;
    border: 1px solid var(--rk-border);
    background: var(--rk-surface);
    color: var(--rk-text);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    white-space: nowrap;
}
.rk-api-pane-chip.is-neutral {
    background: #F8FAFC;
    color: var(--rk-text-secondary);
}
.rk-api-pane-chip.is-active {
    background: #DBEAFE;
    color: var(--rk-primary);
    border-color: rgba(37, 99, 235, 0.18);
}
.rk-api-pane-chip.is-success {
    background: #DCFCE7;
    color: #166534;
    border-color: rgba(22, 163, 74, 0.18);
}
.rk-api-pane-chip.is-warning {
    background: #FEF3C7;
    color: #92400E;
    border-color: rgba(217, 119, 6, 0.2);
}
.rk-api-pane-chip.is-error {
    background: #FEE2E2;
    color: #991B1B;
    border-color: rgba(220, 38, 38, 0.18);
}
.rk-api-pane-meta {
    font-size: 12px;
    color: var(--rk-text-secondary);
    line-height: 1.5;
    text-align: right;
}
.rk-request-section,
.rk-response-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    background: var(--rk-white);
}
.rk-request-section {
    overflow: hidden;
}
.rk-response-section {
    overflow: hidden;
}

/* --- Response Viewer --- */
.rk-response-viewer {
    display: flex;
    flex-direction: column;
    height: 100%;
    position: relative;
    min-height: 0;
}
.rk-response-content {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
}
.rk-response-content.is-loading {
    overflow: hidden;
}
.rk-response-loading-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: stretch;
    justify-content: stretch;
    background: rgba(248, 250, 252, 0.78);
    backdrop-filter: blur(1.5px);
    z-index: 2;
    pointer-events: all;
}
.rk-response-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    border-bottom: 1px solid var(--rk-border);
}
.rk-status-badge {
    padding: 5px 12px;
    border-radius: 0;
    font-size: 13px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}
.rk-status-success { background: #DCFCE7; color: #166534; }
.rk-status-redirect { background: #FEF3C7; color: #92400E; }
.rk-status-client-error { background: #FEE2E2; color: #991B1B; }
.rk-status-server-error { background: #FEE2E2; color: #991B1B; }
.rk-status-error { background: #F1F5F9; color: #64748B; }
.rk-response-meta { font-size: 12px; color: var(--rk-text-secondary); font-variant-numeric: tabular-nums; }
.rk-response-actions {
    display: flex;
    gap: 6px;
    padding: 8px 16px;
    border-bottom: 1px solid var(--rk-border);
    background: var(--rk-surface);
}
.rk-response-body { flex: 1; overflow: hidden; min-height: 200px; }
.rk-response-body-fallback {
    overflow: auto;
    padding: 16px;
    background: var(--rk-white);
}
.rk-response-pre {
    margin: 0;
    white-space: pre-wrap;
    word-break: break-word;
    font-family: var(--rk-font-mono);
    font-size: 13px;
    line-height: 1.6;
    color: var(--rk-text);
}
.rk-response-headers-list { flex: 1; overflow: auto; }
.rk-header-row {
    display: flex;
    gap: 16px;
    padding: 6px 16px;
    border-bottom: 1px solid var(--rk-border-light, #F1F5F9);
    font-size: 12px;
}
.rk-header-key { font-weight: 600; color: var(--rk-text); min-width: 160px; }
.rk-header-value { color: var(--rk-text-secondary); word-break: break-all; }

/* --- Shared Utility --- */
.rk-tab-bar-sm .rk-tab { padding: 7px 12px; font-size: 11px; }
.rk-field { margin-bottom: 12px; }
.rk-label {
    display: block;
    font-size: 12px;
    font-weight: 600;
    color: var(--rk-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    margin-bottom: 4px;
}
.rk-body-editor { display: flex; flex-direction: column; height: 100%; }
.rk-body-textarea { flex: 1; min-height: 160px; resize: none; }
.rk-auth-panel { padding: 4px 0; }
.rk-kv-editor { padding: 4px 0; }
.rk-settings-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.rk-settings-section {
    display: flex;
    flex-direction: column;
    gap: 12px;
    border: 1px solid var(--rk-border);
    padding: 16px;
    background: var(--rk-surface);
}
.rk-settings-section-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}
.rk-settings-actions {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}
.rk-settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
}
.rk-settings-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--rk-text);
}
.rk-settings-subtitle {
    margin-top: 4px;
    font-size: 12px;
    color: var(--rk-text-secondary);
    line-height: 1.5;
}
.rk-settings-subtitle code {
    font-family: var(--rk-font-mono);
    font-size: 12px;
}
.rk-settings-checkbox {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--rk-text);
}
.rk-settings-note {
    font-size: 12px;
    color: var(--rk-text-secondary);
    line-height: 1.5;
}
.rk-env-variable-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 8px;
}
.rk-env-variable-row {
    display: grid;
    grid-template-columns: auto minmax(120px, 1fr) minmax(160px, 1.2fr) auto auto;
    gap: 6px;
    align-items: center;
}
.rk-env-toggle {
    width: 16px;
    height: 16px;
    accent-color: var(--rk-primary);
}
.rk-env-key,
.rk-env-value {
    font-family: var(--rk-font-mono);
    font-size: 13px;
}
.rk-method-select {
    width: auto;
    min-width: 100px;
    border: none;
    border-right: 1px solid var(--rk-border);
    border-radius: 0;
    font-weight: 600;
    font-size: 12px;
    font-family: var(--rk-font-mono);
    padding: 7px 10px;
    cursor: pointer;
    background: var(--rk-white);
    color: var(--rk-text);
}
.rk-url-input {
    flex: 1;
    border: none;
    border-radius: 0;
    font-family: var(--rk-font-mono);
    font-size: 13px;
    padding: 7px 10px;
    color: var(--rk-text);
}
.rk-url-input:focus { outline: 2px solid var(--rk-primary); outline-offset: -2px; }
.rk-url-bar .rk-send-btn {
    border: none;
    border-left: 1px solid var(--rk-border);
    border-radius: 0;
    width: 120px;
    min-width: 120px;
    flex-basis: 120px;
    justify-content: center;
    gap: 8px;
    flex-shrink: 0;
    padding-left: 14px;
    padding-right: 14px;
}
.rk-send-btn.is-loading {
    background: var(--rk-primary);
    border-color: var(--rk-border);
    color: var(--rk-white);
}
.rk-send-btn.is-loading:hover {
    background: var(--rk-primary-hover);
    border-color: var(--rk-border);
}
.rk-send-spinner {
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255, 255, 255, 0.35);
    border-top-color: var(--rk-white);
    border-radius: 50%;
    animation: rk-spin 0.6s linear infinite;
    flex-shrink: 0;
    margin-left: 2px;
}

/* --- API Client Layout with Sidebar --- */
.rk-api-sidebar {
    width: 100%;
    min-width: 0;
    height: 100%;
    background: var(--rk-surface);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.rk-sidebar-tab-bar {
    display: flex;
    border-bottom: 1px solid var(--rk-border);
    background: #FCFDFF;
    flex-shrink: 0;
}
.rk-sidebar-tab {
    flex: 1;
    padding: 11px 14px;
    border: none;
    background: transparent;
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    color: var(--rk-text-secondary);
    border-bottom: 2px solid transparent;
    transition: all 0.15s ease;
    font-family: var(--rk-font-sans);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}
.rk-sidebar-tab:hover { color: var(--rk-text); }
.rk-sidebar-tab.active {
    color: var(--rk-primary);
    border-bottom-color: var(--rk-primary);
}
.rk-sidebar-content {
    flex: 1;
    overflow-y: auto;
    min-height: 0;
    background: linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);
}
.rk-sidebar-toggle {
    flex-shrink: 0;
}
.rk-request-toolbar {
    display: flex;
    align-items: center;
    padding: 10px 12px;
    border-bottom: 1px solid var(--rk-border);
    gap: 8px;
    background: linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);
}
.rk-request-toolbar-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    margin-left: auto;
}
.rk-request-name-input {
    min-width: 0;
    max-width: 320px;
    font-size: 13px;
    font-weight: 600;
}
.rk-request-section > .rk-url-bar {
    margin: 12px;
}
.rk-request-drawer {
    display: flex;
    flex-direction: column;
    gap: 12px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--rk-border);
    background: linear-gradient(180deg, #FDFEFF 0%, #F4F8FF 100%);
}
.rk-request-drawer-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
}
.rk-request-drawer-actions {
    display: flex;
    gap: 8px;
}
.rk-curl-textarea {
    min-height: 172px;
    font-family: var(--rk-font-mono);
    line-height: 1.6;
}
.rk-inline-banner {
    margin: 0;
}
.rk-api-onboarding {
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 20px;
    flex: 1;
    min-height: 0;
    overflow: auto;
    background:
        radial-gradient(circle at top right, rgba(37, 99, 235, 0.08), transparent 34%),
        linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
}
.rk-api-onboarding-hero {
    padding: 28px;
    border: 1px solid var(--rk-border);
    background:
        linear-gradient(135deg, rgba(37, 99, 235, 0.06), rgba(14, 165, 233, 0.02)),
        var(--rk-white);
    box-shadow: var(--rk-shadow-sm);
}
.rk-api-onboarding-eyebrow {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--rk-primary);
}
.rk-api-onboarding-title {
    margin-top: 12px;
    font-size: 28px;
    line-height: 1.1;
    letter-spacing: -0.04em;
    color: var(--rk-text);
}
.rk-api-onboarding-copy {
    max-width: 58ch;
    margin-top: 10px;
    font-size: 14px;
    line-height: 1.6;
    color: var(--rk-text-secondary);
}
.rk-api-onboarding-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
}
.rk-api-onboarding-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
}
.rk-api-onboarding-card {
    min-height: 132px;
    padding: 18px;
    border: 1px solid var(--rk-border);
    background: var(--rk-white);
    box-shadow: var(--rk-shadow-sm);
}
.rk-api-onboarding-card-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--rk-text);
}
.rk-api-onboarding-card-copy {
    margin-top: 8px;
    font-size: 13px;
    line-height: 1.6;
    color: var(--rk-text-secondary);
}
.rk-api-onboarding-card code {
    font-family: var(--rk-font-mono);
    font-size: 12px;
}

/* --- Collections Sidebar --- */
.rk-collections-sidebar {
    display: flex;
    flex-direction: column;
    height: 100%;
}
.rk-sidebar-actions {
    display: flex;
    gap: 6px;
    padding: 8px;
    border-bottom: 1px solid var(--rk-border);
    flex-shrink: 0;
}
.rk-sidebar-actions .rk-btn-sm {
    flex: 1;
    text-align: center;
    font-size: 12px;
}
.rk-sidebar-selection-bar {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 10px 8px;
    border-bottom: 1px solid var(--rk-border);
    background: var(--rk-white);
}
.rk-sidebar-selection-title {
    font-size: 12px;
    font-weight: 700;
    color: var(--rk-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.rk-sidebar-selection-controls {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    gap: 6px;
    align-items: center;
}
.rk-select-sm {
    min-width: 0;
    padding-top: 6px;
    padding-bottom: 6px;
    font-size: 12px;
}
.rk-sidebar-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 32px 16px;
    color: var(--rk-text-muted);
    font-size: 12px;
    text-align: center;
}
.rk-tree-collection {
    margin-bottom: 2px;
}
.rk-tree-row {
    display: flex;
    align-items: center;
    gap: 4px;
}
.rk-tree-row .rk-tree-item {
    flex: 1;
}
.rk-tree-chevron {
    display: inline-block;
    width: 12px;
    font-size: 10px;
    color: var(--rk-text-muted);
    transition: transform 0.15s ease;
    flex-shrink: 0;
}
.rk-tree-chevron.expanded {
    transform: rotate(90deg);
}
.rk-tree-folder-icon {
    font-size: 15px;
    flex-shrink: 0;
}
.rk-tree-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.rk-tree-count {
    font-size: 10px;
    color: var(--rk-text-muted);
    background: var(--rk-white);
    padding: 1px 6px;
    border-radius: 0;
    border: 1px solid var(--rk-border);
    flex-shrink: 0;
}
.rk-tree-request .rk-method {
    flex-shrink: 0;
}
.rk-tree-actions {
    display: flex;
    align-items: center;
    gap: 4px;
    padding-right: 4px;
    flex-shrink: 0;
}
.rk-tree-action {
    min-width: 28px;
    height: 28px;
    border: 1px solid var(--rk-border);
    background: var(--rk-white);
    color: var(--rk-text-secondary);
    font-size: 11px;
    font-weight: 700;
    font-family: var(--rk-font-mono);
    cursor: pointer;
}
.rk-tree-action:hover {
    color: var(--rk-primary);
    border-color: var(--rk-primary);
}

/* --- History Panel --- */
.rk-history-panel {
    display: flex;
    flex-direction: column;
    height: 100%;
}
.rk-history-list {
    flex: 1;
    overflow-y: auto;
}
.rk-history-row {
    display: flex;
    align-items: stretch;
    border-bottom: 1px solid var(--rk-surface);
}
.rk-history-details {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 3px;
}
.rk-history-actions {
    display: flex;
    align-items: center;
    padding: 8px 8px 8px 0;
}
.rk-history-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 11px;
    color: var(--rk-text-muted);
}
.rk-history-status {
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}
.rk-status-code-success { color: var(--rk-success); }
.rk-status-code-redirect { color: var(--rk-warning); }
.rk-status-code-client-error { color: var(--rk-error); }
.rk-status-code-server-error { color: var(--rk-error); }
.rk-status-code-none { color: var(--rk-text-muted); }
.rk-history-time {
    font-variant-numeric: tabular-nums;
}
.rk-history-timestamp {
    margin-left: auto;
}

/* --- Response Viewer Extended --- */
.rk-response-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 8px 16px;
    border-bottom: 1px solid var(--rk-border);
    background: var(--rk-white);
}
.rk-response-view-tabs {
    display: flex;
    align-items: center;
}
.rk-response-view-tabs .rk-tab {
    padding: 8px 12px;
}
.rk-response-search {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
    flex: 1;
    justify-content: flex-end;
}
.rk-response-search-input {
    max-width: 280px;
}
.rk-response-search-meta {
    font-size: 12px;
    color: var(--rk-text-muted);
    white-space: nowrap;
}
.rk-response-pre mark,
.rk-json-tree mark {
    background: #fef08a;
    color: inherit;
}
.rk-response-preview {
    display: flex;
    flex-direction: column;
    min-height: 0;
    background: var(--rk-white);
}
.rk-response-preview-frame {
    width: 100%;
    flex: 1;
    min-height: 260px;
    border: none;
    background: var(--rk-white);
}
.rk-response-preview-note {
    padding: 8px 16px;
    border-bottom: 1px solid var(--rk-border);
    font-size: 12px;
    color: var(--rk-text-secondary);
    background: var(--rk-warning-light);
}
.rk-preview-empty {
    background: linear-gradient(180deg, #fff 0%, #f8fafc 100%);
}
.rk-json-tree {
    overflow: auto;
    padding: 16px;
    font-family: var(--rk-font-mono);
    font-size: 13px;
    line-height: 1.6;
}
.rk-json-line {
    white-space: pre-wrap;
    word-break: break-word;
}
.rk-json-key {
    color: #1d4ed8;
}
.rk-json-string {
    color: #047857;
}
.rk-json-number {
    color: #b45309;
}
.rk-json-boolean {
    color: #7c3aed;
}
.rk-json-null {
    color: var(--rk-text-muted);
}
.rk-json-brace,
.rk-json-punctuation {
    color: var(--rk-text-secondary);
}

/* --- Diff Viewer --- */
.rk-diff-workbench {
    flex: 1;
    display: flex;
    flex-direction: column;
    width: 100%;
    height: 100%;
    min-height: 0;
    min-width: 0;
    gap: 12px;
    padding: 16px;
    overflow: hidden;
    background:
        linear-gradient(180deg, #FFFCF5 0%, #F8FAFC 42%, #FFFFFF 100%);
}
.rk-diff-hero {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
    padding: 20px 22px;
    border: 1px solid var(--rk-border);
    background: linear-gradient(135deg, #FFF7ED 0%, #FFFFFF 54%, #EFF6FF 100%);
    box-shadow: var(--rk-shadow-sm);
}
.rk-diff-hero-copy {
    max-width: 760px;
}
.rk-diff-hero-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 12px;
    min-width: 360px;
}
.rk-diff-kicker,
.rk-diff-output-kicker,
.rk-diff-empty-kicker {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--rk-warning);
}
.rk-diff-hero-title,
.rk-diff-output-title,
.rk-diff-empty-title {
    letter-spacing: -0.03em;
}
.rk-diff-hero-title {
    margin-top: 8px;
    font-size: 30px;
    line-height: 1.1;
    max-width: 18ch;
    color: var(--rk-text);
}
.rk-diff-hero-text {
    margin-top: 10px;
    max-width: 68ch;
    color: var(--rk-text-secondary);
    line-height: 1.6;
}
.rk-diff-hero-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    align-content: flex-start;
    gap: 8px;
    min-width: 240px;
}
.rk-diff-hero-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(180px, 1fr));
    gap: 10px;
    width: 100%;
}
.rk-diff-hero-stat {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
    padding: 14px 16px;
    border: 1px solid rgba(226, 232, 240, 0.9);
    background: rgba(255, 255, 255, 0.92);
    box-shadow: var(--rk-shadow-sm);
}
.rk-diff-hero-stat-label {
    display: inline-flex;
    align-items: center;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--rk-text-muted);
}
.rk-diff-hero-stat strong {
    font-size: 18px;
    line-height: 1.2;
    color: var(--rk-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.rk-diff-hero-stat-meta {
    font-size: 12px;
    color: var(--rk-text-secondary);
    line-height: 1.5;
}
.rk-diff-inputs {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
    flex-shrink: 0;
}
.rk-diff-input-col {
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    background: var(--rk-white);
    border: 1px solid var(--rk-border);
    box-shadow: var(--rk-shadow-sm);
}
.rk-diff-input-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px 10px;
    border-bottom: 1px solid var(--rk-surface);
}
.rk-diff-input-meta {
    font-size: 12px;
    color: var(--rk-text-muted);
}
.rk-diff-input-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 6px;
}
.rk-diff-textarea {
    flex: 1;
    min-height: 220px;
    max-height: none;
    resize: none;
    margin: 0;
    font-family: var(--rk-font-mono);
    font-size: 13px;
    line-height: 1.5;
    border: none;
    border-radius: 0;
    padding: 14px 16px;
    color: var(--rk-text);
    background: transparent;
    tab-size: 4;
}
.rk-diff-textarea:focus {
    outline: none;
    box-shadow: inset 0 0 0 1px rgba(37, 99, 235, 0.2);
    background: #FCFEFF;
}
.rk-diff-input-footer {
    padding: 10px 16px 14px;
    border-top: 1px solid var(--rk-surface);
    font-size: 12px;
    color: var(--rk-text-muted);
    background: #FBFDFF;
}

/* --- Diff Controls --- */
.rk-diff-controls {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    border: 1px solid var(--rk-border);
    background: rgba(255, 255, 255, 0.9);
    box-shadow: var(--rk-shadow-sm);
    flex-shrink: 0;
    gap: 12px;
    flex-wrap: wrap;
}
.rk-diff-controls-left,
.rk-diff-controls-right,
.rk-diff-controls-center {
    display: flex;
    align-items: center;
    gap: 6px;
}
.rk-diff-controls-center {
    flex: 1;
    justify-content: center;
    min-width: 260px;
    gap: 10px;
}
.rk-diff-controls-right {
    justify-content: flex-end;
    flex-wrap: wrap;
}
.rk-diff-live-pill {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border: 1px solid rgba(37, 99, 235, 0.16);
    background: rgba(37, 99, 235, 0.08);
    color: var(--rk-primary);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.rk-diff-live-note {
    color: var(--rk-text-secondary);
    font-size: 12px;
    line-height: 1.4;
}
.rk-diff-view-toggle {
    display: flex;
    gap: 0;
    background: var(--rk-white);
    border: 1px solid var(--rk-border);
    border-radius: var(--rk-radius-md);
    overflow: hidden;
}
.rk-diff-view-toggle .rk-btn-sm {
    border: none;
    border-radius: 0;
    box-shadow: none;
}
.rk-diff-view-toggle .rk-btn-sm + .rk-btn-sm {
    border-left: 1px solid var(--rk-border);
}

/* --- Diff Stats --- */
.rk-diff-stats {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    font-size: 11px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}
.rk-diff-stat-added { color: var(--rk-success); }
.rk-diff-stat-removed { color: var(--rk-error); }
.rk-diff-stat-modified { color: var(--rk-warning); }
.rk-diff-stat-unchanged { color: var(--rk-text-muted); }

/* --- Diff Output --- */
.rk-diff-output-shell {
    flex: 1;
    min-height: 0;
    display: flex;
    flex-direction: column;
    border: 1px solid var(--rk-border);
    background: var(--rk-white);
    box-shadow: var(--rk-shadow-sm);
}
.rk-diff-output-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 16px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--rk-border);
    background: linear-gradient(180deg, #FFFDF8 0%, #FFFFFF 100%);
}
.rk-diff-output-title {
    margin-top: 4px;
    font-size: 22px;
    line-height: 1.15;
    color: var(--rk-text);
}
.rk-diff-output-summary {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    flex-wrap: wrap;
    gap: 8px;
    color: var(--rk-text-secondary);
    font-size: 12px;
}
.rk-diff-output-mode,
.rk-diff-empty-badge {
    display: inline-flex;
    align-items: center;
    padding: 5px 10px;
    background: var(--rk-surface);
    border: 1px solid var(--rk-border);
    color: var(--rk-text);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}
.rk-diff-output {
    flex: 1;
    overflow: auto;
    min-height: 0;
    background: rgba(255, 255, 255, 0.96);
}
.rk-diff-empty-state {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 14px;
    min-height: 100%;
    padding: 28px;
}
.rk-diff-empty-state-starter {
    background:
        linear-gradient(180deg, rgba(255, 250, 240, 0.55) 0%, rgba(255, 255, 255, 0.96) 100%);
}
.rk-diff-empty-state-match {
    align-items: center;
    text-align: center;
}
.rk-diff-empty-copy {
    max-width: 640px;
}
.rk-diff-empty-text {
    color: var(--rk-text-secondary);
    line-height: 1.6;
}
.rk-diff-empty-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
}
.rk-diff-starter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}
.rk-diff-starter-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    min-height: 180px;
    padding: 16px;
    border: 1px solid var(--rk-border);
    background: var(--rk-white);
    color: var(--rk-text);
    text-align: left;
    box-shadow: var(--rk-shadow-sm);
    cursor: pointer;
    transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
    font-family: var(--rk-font-sans);
}
.rk-diff-starter-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--rk-shadow-md);
    border-color: #CBD5E1;
}
.rk-diff-starter-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 46px;
    height: 30px;
    padding: 0 10px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}
.rk-diff-starter-icon-json {
    background: #EFF6FF;
    color: var(--rk-primary);
}
.rk-diff-starter-icon-config {
    background: #FFFBEB;
    color: var(--rk-warning);
}
.rk-diff-starter-icon-doc {
    background: #F0FDF4;
    color: var(--rk-success);
}
.rk-diff-starter-icon-response {
    background: #F1F5F9;
    color: var(--rk-text-secondary);
}
.rk-diff-starter-title {
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.02em;
}
.rk-diff-starter-text {
    color: var(--rk-text-secondary);
    line-height: 1.5;
}
.rk-diff-view {
    display: flex;
    flex-direction: column;
    min-height: 100%;
    font-family: var(--rk-font-mono);
    font-size: 13px;
    line-height: 1.6;
}

/* --- Side-by-Side View --- */
.rk-diff-sbs-header {
    display: flex;
    border-bottom: 1px solid var(--rk-border);
    background: var(--rk-surface);
    position: sticky;
    top: 0;
    z-index: 1;
}
.rk-diff-sbs-col-header {
    flex: 1;
    padding: 6px 12px;
    font-size: 11px;
    font-weight: 600;
    color: var(--rk-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    font-family: var(--rk-font-sans);
}
.rk-diff-sbs-col-header + .rk-diff-sbs-col-header {
    border-left: 1px solid var(--rk-border);
}
.rk-diff-sbs-body {
    flex: 1;
    overflow: auto;
    min-height: 0;
}
.rk-diff-sbs-row {
    display: flex;
    border-bottom: 1px solid var(--rk-surface);
}
.rk-diff-sbs-cell {
    flex: 1;
    display: flex;
    padding: 0 8px;
    min-width: 0;
    white-space: pre;
    overflow-x: auto;
}
.rk-diff-sbs-cell + .rk-diff-sbs-cell {
    border-left: 1px solid var(--rk-border);
}

/* --- Unified View --- */
.rk-diff-unified-body {
    flex: 1;
    overflow: auto;
    min-height: 0;
}
.rk-diff-unified-header {
    padding: 6px 12px;
    font-size: 11px;
    font-weight: 600;
    color: var(--rk-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    font-family: var(--rk-font-sans);
    border-bottom: 1px solid var(--rk-border);
    background: var(--rk-surface);
    position: sticky;
    top: 0;
    z-index: 1;
}
.rk-diff-unified-line {
    display: flex;
    padding: 0 8px;
    border-bottom: 1px solid var(--rk-surface);
    white-space: pre;
}

/* --- Shared Diff Line Styles --- */
.rk-diff-line-num {
    display: inline-block;
    min-width: 36px;
    padding: 0 6px;
    text-align: right;
    color: var(--rk-text-muted);
    user-select: none;
    flex-shrink: 0;
    font-size: 12px;
}
.rk-diff-line-prefix {
    display: inline-block;
    width: 16px;
    text-align: center;
    flex-shrink: 0;
    user-select: none;
    font-weight: 700;
}
.rk-diff-line-text {
    flex: 1;
    min-width: 0;
}

/* --- Diff Line Colors --- */
.rk-diff-added {
    background: #F0FDF4;
}
.rk-diff-added .rk-diff-line-prefix { color: var(--rk-success); }
.rk-diff-removed {
    background: #FEF2F2;
}
.rk-diff-removed .rk-diff-line-prefix { color: var(--rk-error); }
.rk-diff-modified-left {
    background: #FEF2F2;
}
.rk-diff-modified-left .rk-diff-line-prefix { color: var(--rk-error); }
.rk-diff-modified-right {
    background: #F0FDF4;
}
.rk-diff-modified-right .rk-diff-line-prefix { color: var(--rk-success); }
.rk-diff-unchanged {
    background: var(--rk-white);
}

/* --- Inline Change Highlights --- */
mark.rk-diff-inline-removed {
    background: #FECACA;
    color: var(--rk-error);
    border-radius: 0;
    padding: 0 1px;
}
mark.rk-diff-inline-added {
    background: #BBF7D0;
    color: #166534;
    border-radius: 0;
    padding: 0 1px;
}

/* --- Regex Builder --- */
.rk-regex-builder {
    display: flex;
    flex: 1;
    flex-direction: column;
    width: 100%;
    height: 100%;
    min-width: 0;
    min-height: 0;
    gap: 12px;
    padding: 16px;
    overflow: hidden;
    background: linear-gradient(180deg, #F7FBFF 0%, #F8FAFC 38%, #FFFFFF 100%);
}
.rk-regex-hero {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 18px;
    padding: 20px 22px;
    border: 1px solid var(--rk-border);
    background: linear-gradient(135deg, #EFF6FF 0%, #FFFFFF 54%, #F0FDF4 100%);
    box-shadow: var(--rk-shadow-sm);
}
.rk-regex-hero-copy {
    max-width: 760px;
}
.rk-regex-kicker,
.rk-regex-pane-kicker,
.rk-regex-hero-stat-label {
    display: inline-flex;
    align-items: center;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}
.rk-regex-kicker,
.rk-regex-pane-kicker {
    color: var(--rk-primary);
}
.rk-regex-hero-title,
.rk-regex-pane-title {
    letter-spacing: -0.03em;
    color: var(--rk-text);
}
.rk-regex-hero-title {
    margin-top: 8px;
    font-size: 30px;
    line-height: 1.1;
    max-width: 18ch;
}
.rk-regex-hero-text,
.rk-regex-pane-text {
    color: var(--rk-text-secondary);
    line-height: 1.6;
}
.rk-regex-hero-text {
    margin-top: 10px;
    max-width: 66ch;
}
.rk-regex-hero-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 12px;
    min-width: 360px;
}
.rk-regex-hero-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px;
}
.rk-regex-hero-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(180px, 1fr));
    gap: 10px;
    width: 100%;
}
.rk-regex-hero-stat {
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-width: 0;
    padding: 14px 16px;
    border: 1px solid rgba(226, 232, 240, 0.9);
    background: rgba(255, 255, 255, 0.92);
    box-shadow: var(--rk-shadow-sm);
}
.rk-regex-hero-stat-label {
    color: var(--rk-text-muted);
}
.rk-regex-hero-stat strong {
    font-size: 18px;
    line-height: 1.2;
    color: var(--rk-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.rk-regex-hero-stat-meta {
    font-size: 12px;
    color: var(--rk-text-secondary);
    line-height: 1.5;
}
.rk-regex-shell-body {
    display: flex;
    flex: 1;
    min-width: 0;
    min-height: 0;
    gap: 12px;
}
.rk-regex-sidebar-shell,
.rk-regex-main-shell,
.rk-regex-results-shell {
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    border: 1px solid var(--rk-border);
    background: var(--rk-white);
    box-shadow: var(--rk-shadow-sm);
}
.rk-regex-sidebar-shell {
    width: 280px;
    min-width: 280px;
}
.rk-regex-results-shell {
    width: 340px;
    min-width: 340px;
}
.rk-regex-main-shell {
    flex: 1;
}
.rk-regex-pane-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 14px;
    padding: 14px 16px;
    border-bottom: 1px solid var(--rk-border);
    background: linear-gradient(180deg, #FFFDF8 0%, #FFFFFF 100%);
}
.rk-regex-pane-header > div:first-child {
    flex: 1;
    min-width: 0;
}
.rk-regex-pane-header-sidebar {
    background: linear-gradient(180deg, #F8FAFC 0%, #FFFFFF 100%);
}
.rk-regex-pane-title {
    margin-top: 4px;
    font-size: 22px;
    line-height: 1.15;
}
.rk-regex-pane-text {
    margin-top: 8px;
    font-size: 13px;
}
.rk-regex-pane-meta-group {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 8px;
    max-width: 240px;
    min-width: 0;
}
.rk-regex-pane-chip {
    display: inline-flex;
    align-items: center;
    padding: 5px 10px;
    border: 1px solid var(--rk-border);
    background: var(--rk-surface);
    color: var(--rk-text);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    white-space: nowrap;
}
.rk-regex-pane-chip.is-neutral {
    background: #F8FAFC;
    color: var(--rk-text-secondary);
}
.rk-regex-pane-chip.is-active {
    background: #DBEAFE;
    color: var(--rk-primary);
    border-color: rgba(37, 99, 235, 0.18);
}
.rk-regex-pane-chip.is-success {
    background: #DCFCE7;
    color: #166534;
    border-color: rgba(22, 163, 74, 0.18);
}
.rk-regex-pane-chip.is-warning {
    background: #FEF3C7;
    color: #92400E;
    border-color: rgba(217, 119, 6, 0.2);
}
.rk-regex-pane-chip.is-error {
    background: #FEE2E2;
    color: #991B1B;
    border-color: rgba(220, 38, 38, 0.18);
}
.rk-regex-pane-meta {
    font-size: 12px;
    color: var(--rk-text-secondary);
    line-height: 1.5;
    text-align: right;
}
.rk-regex-sidebar {
    width: 100%;
    min-width: 0;
    height: 100%;
    background: var(--rk-surface);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.rk-regex-sidebar .rk-tab-content {
    overflow-y: auto;
    flex: 1;
}
.rk-regex-main {
    flex: 1;
    min-width: 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background: var(--rk-white);
}
.rk-regex-results {
    width: 100%;
    min-width: 0;
    height: 100%;
    background: var(--rk-white);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
.rk-regex-results .rk-tab-content {
    overflow-y: auto;
    flex: 1;
    background: linear-gradient(180deg, #FBFDFF 0%, #FFFFFF 100%);
}

/* --- Pattern Input --- */
.rk-regex-input-area {
    padding: 12px;
    border-bottom: 1px solid var(--rk-border);
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-shrink: 0;
    background: linear-gradient(180deg, #FBFDFF 0%, #FFFFFF 100%);
}
.rk-regex-pattern-row {
    display: flex;
    align-items: center;
    gap: 0;
    border: 1px solid var(--rk-border);
    border-radius: var(--rk-radius-lg);
    background: var(--rk-white);
    box-shadow: var(--rk-shadow-sm);
    overflow: hidden;
}
.rk-regex-slash {
    padding: 7px 6px;
    font-family: var(--rk-font-mono);
    font-size: 18px;
    font-weight: 600;
    color: var(--rk-primary);
    user-select: none;
    flex-shrink: 0;
}
.rk-regex-pattern-input {
    flex: 1;
    border: none !important;
    border-radius: 0 !important;
    box-shadow: none !important;
    font-family: var(--rk-font-mono);
    font-size: 15px;
    padding: 8px 4px;
}
.rk-regex-pattern-input:focus {
    box-shadow: none !important;
}
.rk-regex-pipe-btn {
    align-self: flex-start;
}

/* --- Flags Bar --- */
.rk-flags-bar {
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 0 6px;
    flex-shrink: 0;
}
.rk-flag-btn {
    width: 32px;
    height: 32px;
    border: 1px solid transparent;
    border-radius: var(--rk-radius-sm);
    background: transparent;
    color: var(--rk-text-muted);
    font-family: var(--rk-font-mono);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.12s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}
.rk-flag-btn:hover {
    background: var(--rk-surface);
    color: var(--rk-text);
}
.rk-flag-btn.active {
    background: var(--rk-primary-light);
    color: var(--rk-primary);
    border-color: var(--rk-primary);
}

/* --- Test String Area --- */
.rk-regex-test-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 12px;
    gap: 8px;
    min-height: 0;
    overflow: hidden;
}
.rk-regex-test-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
    flex-shrink: 0;
}
.rk-regex-test-input {
    flex: 1;
    resize: none;
    font-family: var(--rk-font-mono);
    font-size: 13px;
    line-height: 1.6;
    min-height: 120px;
    tab-size: 4;
}
.rk-match-count-badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    background: var(--rk-success-light);
    color: var(--rk-success);
    font-size: 11px;
    font-weight: 600;
    border-radius: 0;
    border: 1px solid #BBF7D0;
}
.rk-match-count-badge-sm {
    padding: 1px 6px;
    font-size: 10px;
    margin-left: 4px;
}

/* --- Highlighted Matches --- */
.rk-regex-highlight-area {
    padding: 0 12px 12px;
    flex-shrink: 0;
    max-height: 160px;
    overflow-y: auto;
}
.rk-regex-highlight-output {
    font-family: var(--rk-font-mono);
    font-size: 13px;
    line-height: 1.6;
    padding: 10px 12px;
    background: var(--rk-surface);
    border: 1px solid var(--rk-border);
    border-radius: var(--rk-radius-md);
    white-space: pre-wrap;
    word-break: break-all;
}
.rk-regex-highlight-empty {
    padding: 14px 12px;
    border: 1px dashed var(--rk-border);
    background: var(--rk-surface);
    font-size: 13px;
    line-height: 1.5;
    color: var(--rk-text-secondary);
}
mark.rk-regex-hl {
    background: #FDE68A;
    color: var(--rk-text);
    border-radius: 0;
    padding: 0 1px;
}

/* --- Match Details --- */
.rk-match-details {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 12px;
}
.rk-match-empty {
    color: var(--rk-text-muted);
    font-size: 12px;
    padding: 18px 12px;
    text-align: center;
}
.rk-match-item {
    border: 1px solid var(--rk-border);
    border-radius: var(--rk-radius-md);
    overflow: hidden;
}
.rk-match-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6px 10px;
    background: var(--rk-surface);
    border-bottom: 1px solid var(--rk-border);
}
.rk-match-badge {
    font-size: 11px;
    font-weight: 600;
    color: var(--rk-primary);
}
.rk-match-pos {
    font-size: 10px;
    color: var(--rk-text-muted);
    font-variant-numeric: tabular-nums;
}
.rk-match-value {
    padding: 6px 10px;
    font-family: var(--rk-font-mono);
    font-size: 12px;
    color: var(--rk-text);
    background: var(--rk-white);
    word-break: break-all;
}
.rk-match-groups {
    border-top: 1px solid var(--rk-border);
    background: var(--rk-surface);
}
.rk-match-group-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 4px 10px;
    font-size: 11px;
    border-bottom: 1px solid var(--rk-border);
}
.rk-match-group-row:last-child {
    border-bottom: none;
}
.rk-group-label {
    font-weight: 600;
    color: var(--rk-text-secondary);
    min-width: 80px;
    flex-shrink: 0;
}
.rk-group-value {
    font-family: var(--rk-font-mono);
    color: var(--rk-text);
    word-break: break-all;
}

/* --- Explanation Panel --- */
.rk-explanation-panel {
    font-size: 12px;
    padding: 12px;
}
.rk-explanation-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--rk-white);
    border: 1px solid var(--rk-border);
}
.rk-explanation-table th {
    text-align: left;
    padding: 6px 10px;
    font-size: 11px;
    font-weight: 600;
    color: var(--rk-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.3px;
    background: var(--rk-surface);
    border-bottom: 1px solid var(--rk-border);
    position: sticky;
    top: 0;
}
.rk-explanation-table td {
    padding: 5px 10px;
    border-bottom: 1px solid var(--rk-surface);
}
.rk-explanation-token {
    font-family: var(--rk-font-mono);
    font-size: 12px;
    font-weight: 600;
    color: var(--rk-primary);
    background: var(--rk-primary-light);
    padding: 1px 5px;
    border-radius: 0;
}
.rk-explanation-desc {
    color: var(--rk-text-secondary);
}

/* --- Common Patterns Panel --- */
.rk-common-patterns {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 8px;
}
.rk-pattern-category {
    margin-bottom: 4px;
}
.rk-pattern-card {
    padding: 10px 12px;
    cursor: pointer;
    border-radius: var(--rk-radius-sm);
    border: 1px solid transparent;
    transition: background 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}
.rk-pattern-card:hover {
    background: var(--rk-white);
    border-color: var(--rk-border);
    box-shadow: var(--rk-shadow-sm);
    transform: translateY(-1px);
}
.rk-pattern-card-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--rk-text);
}
.rk-pattern-card-sample {
    font-size: 12px;
    font-family: var(--rk-font-mono);
    color: var(--rk-text-muted);
    margin-top: 2px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* --- Blazor Error UI --- */
#blazor-error-ui {
    display: none; position: fixed; bottom: 0; left: 0; right: 0;
    padding: 8px 16px; background: var(--rk-error); color: var(--rk-white);
    font-size: 13px; z-index: 9999;
}

/* --- Disabled Buttons --- */
.rk-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
}

/* --- Error Panel (Workbench ErrorBoundary) --- */
.rk-error-panel {
    padding: 24px;
    text-align: center;
    color: var(--rk-error);
    font-size: 13px;
    font-weight: 500;
}

/* Responsive: tablet */
@media (max-width: 1024px) {
    .rk-sidebar {
        width: 220px;
        min-width: 220px;
    }
    .rk-panel {
        width: 260px;
        min-width: 260px;
    }
    .rk-topbar {
        align-items: flex-start;
    }
    .rk-topbar-left,
    .rk-topbar-center,
    .rk-topbar-right {
        width: 100%;
    }
    .rk-topbar-right {
        justify-content: flex-start;
    }
    .rk-topbar-workspace {
        flex: 1 1 260px;
    }
    .rk-statusbar-right {
        justify-content: flex-start;
    }
    .rk-diff-hero {
        flex-direction: column;
    }
    .rk-diff-hero-right,
    .rk-diff-hero-actions,
    .rk-diff-output-summary {
        align-items: flex-start;
        justify-content: flex-start;
        min-width: 0;
        width: 100%;
    }
    .rk-diff-hero-stats {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .rk-diff-controls-center {
        justify-content: flex-start;
        min-width: 100%;
    }
    .rk-api-shell-hero,
    .rk-api-shell-body,
    .rk-api-client {
        flex-direction: column;
    }
    .rk-api-shell-right,
    .rk-api-shell-actions {
        align-items: flex-start;
        justify-content: flex-start;
        min-width: 0;
        width: 100%;
    }
    .rk-api-shell-stats {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .rk-api-sidebar-shell {
        width: 100%;
        min-width: 0;
        max-height: 320px;
    }
    .rk-api-pane-meta-group {
        align-items: flex-start;
        max-width: none;
    }
    .rk-api-pane-meta {
        text-align: left;
    }
    .rk-regex-hero,
    .rk-regex-shell-body {
        flex-direction: column;
    }
    .rk-regex-hero-right,
    .rk-regex-hero-actions {
        align-items: flex-start;
        justify-content: flex-start;
        min-width: 0;
        width: 100%;
    }
    .rk-regex-hero-stats {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
    .rk-regex-sidebar-shell,
    .rk-regex-results-shell {
        width: 100%;
        min-width: 0;
        max-height: 320px;
    }
    .rk-regex-pane-meta-group {
        align-items: flex-start;
        max-width: none;
    }
    .rk-regex-pane-meta {
        text-align: left;
    }
}

/* Responsive: mobile */
@media (max-width: 768px) {
    .rk-app {
        flex-direction: column;
        overflow: auto;
    }
    .rk-sidebar {
        width: 100%;
        min-width: unset;
        max-height: 40vh;
        overflow-y: auto;
        border-right: none;
        border-bottom: 1px solid var(--rk-border);
    }
    .rk-panel {
        width: 100%;
        min-width: unset;
        max-height: 40vh;
        overflow-y: auto;
        border-left: none;
        border-top: 1px solid var(--rk-border);
    }
    .rk-main {
        min-height: auto;
    }
    .rk-topbar {
        padding: 12px;
        gap: 10px;
    }
    .rk-topbar-center {
        overflow-x: auto;
    }
    .rk-topbar-right {
        flex-direction: column;
        align-items: stretch;
    }
    .rk-topbar-status,
    .rk-topbar-workspace,
    .rk-topbar-actions {
        width: 100%;
    }
    .rk-topbar-actions .rk-btn {
        flex: 1 1 calc(33.333% - 6px);
    }
    .rk-url-bar {
        flex-wrap: wrap;
    }
    .rk-settings-section-header {
        flex-direction: column;
    }
    .rk-env-variable-row {
        grid-template-columns: auto 1fr;
    }
    .rk-env-variable-row .rk-env-value {
        grid-column: 1 / -1;
    }
    .rk-api-client-layout {
        padding: 12px;
    }
    .rk-api-shell-hero,
    .rk-api-pane-header {
        padding: 16px;
    }
    .rk-api-shell-title {
        font-size: 24px;
    }
    .rk-api-shell-stats {
        grid-template-columns: 1fr;
    }
    .rk-regex-builder {
        padding: 12px;
    }
    .rk-regex-hero,
    .rk-regex-pane-header {
        padding: 16px;
    }
    .rk-regex-hero-title {
        font-size: 24px;
    }
    .rk-regex-hero-stats {
        grid-template-columns: 1fr;
    }
    .rk-regex-hero-right,
    .rk-regex-hero-actions {
        width: 100%;
        justify-content: flex-start;
    }
    .rk-regex-pane-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .rk-regex-pane-meta-group {
        width: 100%;
    }
    .rk-regex-sidebar-shell,
    .rk-regex-results-shell {
        max-height: none;
    }
    .rk-api-shell-actions .rk-btn,
    .rk-request-toolbar-actions .rk-btn {
        flex: 1 1 auto;
    }
    .rk-api-pane-header,
    .rk-request-toolbar {
        flex-direction: column;
        align-items: flex-start;
    }
    .rk-api-pane-meta-group,
    .rk-request-toolbar-actions {
        width: 100%;
    }
    .rk-request-name-input {
        max-width: none;
        width: 100%;
    }
    .rk-request-section > .rk-url-bar {
        margin: 12px;
    }
    .rk-api-onboarding-grid {
        grid-template-columns: 1fr;
    }
    .rk-home-hero,
    .rk-home-shell {
        grid-template-columns: 1fr;
    }
    .rk-home-features {
        grid-template-columns: 1fr;
    }
    .rk-home-workspace-date {
        margin-left: 0;
    }
    .rk-diff-workbench {
        padding: 12px;
    }
    .rk-diff-inputs {
        grid-template-columns: 1fr;
    }
    .rk-diff-hero,
    .rk-diff-output-header {
        padding: 16px;
    }
    .rk-diff-hero-title {
        font-size: 24px;
    }
    .rk-diff-hero-stats {
        grid-template-columns: 1fr;
    }
    .rk-diff-controls {
        align-items: flex-start;
    }
    .rk-diff-hero-right,
    .rk-diff-controls-left,
    .rk-diff-controls-center,
    .rk-diff-controls-right,
    .rk-diff-hero-actions,
    .rk-diff-output-summary {
        width: 100%;
        justify-content: flex-start;
    }
    .rk-diff-empty-state {
        padding: 20px;
    }
}

/* Responsive: small mobile */
@media (max-width: 480px) {
    .rk-topbar {
        padding: 6px 8px;
    }
    .rk-mode-tab {
        min-width: 0;
        flex: 1;
        padding: 8px 10px;
        font-size: 12px;
        align-items: center;
        text-align: center;
    }
    .rk-mode-tab-hint {
        font-size: 9px;
    }
    .rk-topbar-actions .rk-btn {
        width: 100%;
        flex-basis: 100%;
    }
    .rk-home {
        padding: 24px 16px;
    }
    .rk-home-hero-copy,
    .rk-home-hero-panel,
    .rk-home-workspaces,
    .rk-home-features-panel {
        padding: 16px;
    }
    .rk-home-hero-copy {
        padding: 22px 18px 24px;
    }
    .rk-home-title {
        font-size: 34px;
    }
    .rk-home-hero-actions {
        flex-direction: column;
    }
    .rk-home-features {
        gap: 10px;
    }
    .rk-feature-card {
        padding: 14px;
    }
    .rk-workspace-card-inner {
        flex-wrap: wrap;
        padding: 14px;
    }
    .rk-api-shell-actions .rk-btn,
    .rk-request-toolbar-actions .rk-btn,
    .rk-api-onboarding-actions .rk-btn,
    .rk-regex-hero-actions .rk-btn {
        width: 100%;
    }
    .rk-diff-hero-actions .rk-btn,
    .rk-diff-controls-left .rk-btn,
    .rk-diff-controls-right .rk-btn {
        width: 100%;
    }
    .rk-diff-starter-grid {
        grid-template-columns: 1fr;
    }
    .rk-diff-starter-card {
        min-height: 0;
    }
}