/* ==================================
   LaTeX Editor — Rich Light (documents: amber, used sparingly)
   ================================== */

/* Page accent scope — root-level (spec §D) */
:root {
    --pg: var(--cat-doc);
    --pg-hover: #b45309;
    --pg-text: var(--cat-doc-text);
    --pg-subtle: var(--cat-doc-bg);
    --pg-border: var(--cat-doc-border);
    --pg-ring: rgba(217, 119, 6, 0.14);
}

/* Full height layout */
.latex-page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Toolbar — docked app bar "lid"; navbar (60px) + toolbar (48px) = one 108px chrome unit.
   Stays fixed (page-specific docking); lid shadow per §C.12. */
.latex-toolbar {
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    height: 48px;
    background: #fff;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
    margin: 0;
    box-shadow: 0 1px 8px rgba(30, 27, 75, 0.04);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px;
    z-index: 90;
}

.toolbar-left,
.toolbar-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* .toolbar-btn — ghost sm, fully inherited from the shared system in style.css */

.toolbar-divider {
    width: 1px;
    height: 20px;
    background: var(--border);
    margin: 0 6px;
}

/* Export Group */
.export-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.filename-input {
    width: 140px;
    height: 32px;
    padding: 0 12px;
    border: 1px solid var(--border-strong);
    border-radius: var(--r-sm);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-variant-numeric: tabular-nums;
    color: var(--text-primary);
    background: #fff;
    transition: border-color var(--t-fast), box-shadow var(--t-fast);
}

.filename-input::placeholder {
    color: var(--text-disabled);
}

.filename-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: var(--focus-ring);
}

/* Format Dropdown */
.format-dropdown {
    position: relative;
}

/* Dropdown trigger — secondary sm (§C.2) */
.format-dropdown-btn {
    display: inline-flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    height: 32px;
    padding: 0 12px;
    border: 1px solid var(--border-strong);
    border-radius: var(--r-sm);
    background: linear-gradient(180deg, #fff, #fafbff);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    user-select: none;
    min-width: 90px;
    box-shadow: 0 1px 2px rgba(30, 27, 75, 0.06);
    transition: background var(--t-fast), border-color var(--t-fast), color var(--t-fast),
                transform var(--t-lift), box-shadow var(--t-lift);
}

.format-dropdown-btn:hover {
    border-color: #c3c7dd;
    box-shadow: var(--e1);
    transform: translateY(-1px);
}

.format-dropdown-btn:active {
    background: var(--bg-inset);
    transform: translateY(0);
    box-shadow: 0 1px 2px rgba(30, 27, 75, 0.06);
}

.format-dropdown-btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.format-dropdown-btn svg {
    color: var(--text-muted);
    flex-shrink: 0;
}

/* Dropdown menu (§C.8) */
.format-dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 4px;
    background: #fff;
    border: 1px solid var(--border-lifted);
    border-radius: var(--r-md);
    box-shadow: var(--e2);
    padding: 5px;
    min-width: 140px;
    z-index: 100;
    display: none;
}

.format-dropdown-menu.show {
    display: block;
}

.format-option {
    display: block;
    width: 100%;
    padding: 7px 10px;
    border: none;
    border-radius: var(--r-xs);
    background: none;
    text-align: left;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    color: var(--text-primary);
    cursor: pointer;
    transition: background var(--t-fast), color var(--t-fast);
}

.format-option:hover {
    background: rgba(99, 102, 241, 0.08);
    color: var(--text-primary);
}

.format-option:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* Selection in dropdowns is brand indigo, never amber (§E4) */
.format-option.active {
    background: var(--accent-subtle);
    color: var(--accent-text);
    font-weight: 600;
    box-shadow: inset 0 0 0 1px rgba(79, 70, 229, 0.15);
}

/* #export-btn — inherits the gradient primary recipe from style.css; no local overrides */

/* Main Layout — faint amber page wash (whisper-level) */
.latex-main {
    flex: 1;
    margin-top: 108px; /* navbar (60px) + toolbar (48px) */
    padding: 20px;
    background:
        radial-gradient(80% 55% at 50% 0%, rgba(217, 119, 6, 0.045) 0%, transparent 65%),
        #f4f5f8;
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 108px - 120px); /* Subtract navbar+toolbar and footer */
}

/* Container floats as one instrument */
.latex-container {
    display: flex;
    gap: 0;
    flex: 1;
    background: #fff;
    border: 1px solid var(--border-lifted);
    border-radius: var(--r-lg);
    box-shadow: var(--e3);
    overflow: hidden;
    min-height: 500px;
}

/* Panel Styles */
.editor-panel,
.preview-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-width: 0;
}

.editor-panel {
    border-right: 1px solid var(--border);
}

.panel-header {
    height: 40px;
    padding: 0 14px;
    background: var(--wash-panel);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
}

.panel-label {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.07em;
    line-height: 1.3;
}

.panel-label::before {
    content: '';
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--pg);
    box-shadow: 0 0 0 3px var(--pg-ring);
}

/* Preview panel's dot goes green — live output */
.preview-panel .panel-label::before {
    background: linear-gradient(135deg, #10b981, #059669);
    box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.12);
}

/* Resize Handle — full hit area, centered painted line */
.resize-handle {
    width: 5px;
    background: linear-gradient(var(--border), var(--border)) center / 1px 100% no-repeat;
    cursor: col-resize;
    transition: background var(--t-fast);
}

.resize-handle:hover {
    background: linear-gradient(180deg, #4f46e5, #7c3aed) center / 2px 100% no-repeat;
}

/* Editor Wrapper */
.editor-wrapper {
    flex: 1;
    display: flex;
    overflow: hidden;
    min-height: 0;
    position: relative; /* positioning context for the error-line overlay */
}

.line-numbers {
    padding: 12px 8px;
    background: #f8f9fc;
    border-right: 1px solid var(--border);
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.75rem;
    /* 1.3rem = 0.8125rem x 1.6 — pixel-matches the textarea line height so rows stay aligned */
    line-height: 1.3rem;
    font-variant-numeric: tabular-nums;
    color: var(--text-muted);
    user-select: none;
    text-align: right;
    min-width: 40px;
    overflow-y: auto;
    overflow-x: hidden;
}

.line-numbers span {
    display: block;
}

.latex-textarea {
    flex: 1;
    padding: 12px 16px;
    border: none;
    resize: none;
    font-family: var(--font-mono);
    font-weight: 400;
    font-size: 0.8125rem;
    line-height: 1.6;
    color: var(--text-primary);
    caret-color: var(--accent);
    background: #fff;
    outline: none;
    overflow: auto;
}

.latex-textarea::selection {
    background: rgba(79, 70, 229, 0.14);
}

.latex-textarea::placeholder {
    color: var(--text-disabled);
}

/* Preview Panel — paper sheet on a desk */
.preview-wrapper {
    flex: 1;
    overflow: auto;
    padding: 24px;
    background: #f4f5f8;
    min-height: 0;
}

.preview-content {
    background: #fff;
    max-width: 720px;
    margin: 0 auto;
    min-height: 240px;
    padding: 40px 48px;
    border-radius: 6px;
    box-shadow: 0 1px 3px rgba(30, 27, 75, 0.08), 0 8px 24px rgba(30, 27, 75, 0.07);
    font-family: 'Times New Roman', Times, serif;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-primary);
}

.preview-placeholder {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-style: normal;
    text-align: center;
    padding: 48px 16px;
}

.preview-loading {
    color: var(--text-muted);
    font-size: 0.875rem;
    font-style: normal;
    text-align: center;
    padding: 48px 16px;
}

.preview-error {
    color: var(--error);
    background: var(--error-subtle);
    border: 1px solid var(--error-border);
    padding: 12px 16px;
    border-radius: var(--r-sm);
    font-size: 0.875rem;
}

.fallback-preview {
    color: var(--text-primary);
}

/* Status Message — white card with colored edge (§C.9), never a solid slab */
.status-message {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: #fff;
    border: 1px solid var(--border-lifted);
    border-left-width: 3px;
    border-radius: var(--r-md);
    box-shadow: var(--e3);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 12px 16px 12px 14px;
    z-index: 1000;
    animation: slideUp 0.3s var(--ease);
}

.status-message.success {
    border-left-color: var(--success);
}

.status-message.error {
    border-left-color: var(--error-strong);
}

.status-message.info {
    border-left-color: var(--accent);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(250, 251, 252, 0.88);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
}

.loading-spinner {
    width: 28px;
    height: 28px;
    border: 2.5px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 16px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-text {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

/* Responsive */
@media (max-width: 768px) {
    .latex-toolbar {
        padding: 8px 16px;
        height: auto;
        min-height: 48px;
        flex-wrap: wrap;
        gap: 8px;
    }

    .toolbar-left,
    .toolbar-right {
        flex-wrap: wrap;
    }

    .latex-main {
        margin-top: 118px;
    }

    .latex-container {
        flex-direction: column;
    }

    .editor-panel {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

    .editor-panel,
    .preview-panel {
        flex: none;
        height: 50%;
    }

    .resize-handle {
        display: none;
    }

    .filename-input {
        width: 80px;
    }

    .preview-wrapper {
        padding: 12px;
    }

    .preview-content {
        padding: 24px 20px;
    }

    .snippet-bar {
        padding: 6px 8px;
    }

    .template-grid {
        grid-template-columns: 1fr;
    }
}

/* ==================================
   Snippet toolbar
   ================================== */
.snippet-bar {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 6px 12px;
    background: var(--wash-panel);
    border-bottom: 1px solid var(--border);
    overflow-x: auto;
    overflow-y: visible;
    scrollbar-width: thin;
    flex-wrap: nowrap;
}

.snippet-bar::-webkit-scrollbar {
    height: 6px;
}

.snippet-bar::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 3px;
}

.snippet-group {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
}

.snippet-divider {
    width: 1px;
    height: 18px;
    background: var(--border);
    margin: 0 4px;
    flex-shrink: 0;
}

.snippet-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 28px;
    min-width: 30px;
    padding: 0 8px;
    border: 1px solid var(--border-strong);
    border-radius: var(--r-sm);
    background: #fff;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 500;
    line-height: 1;
    cursor: pointer;
    white-space: nowrap;
    user-select: none;
    transition: background var(--t-fast), border-color var(--t-fast),
                color var(--t-fast), transform var(--t-lift), box-shadow var(--t-lift);
}

.snippet-btn:hover {
    border-color: var(--pg-border);
    background: var(--pg-subtle);
    color: var(--pg-text);
    transform: translateY(-1px);
    box-shadow: var(--e1);
}

.snippet-btn:active {
    transform: translateY(0);
    box-shadow: none;
}

.snippet-btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* Greek / symbols popover */
.greek-wrap {
    position: relative;
    flex-shrink: 0;
}

/* Fixed positioning (placed by JS) so the scrolling snippet-bar can't clip it */
.greek-popover {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 220;
    display: none;
    grid-template-columns: repeat(6, 1fr);
    gap: 4px;
    width: 260px;
    max-width: 78vw;
    padding: 8px;
    background: #fff;
    border: 1px solid var(--border-lifted);
    border-radius: var(--r-md);
    box-shadow: var(--e3);
}

.greek-popover.show {
    display: grid;
}

.greek-key {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    height: 30px;
    padding: 0 2px;
    border: 1px solid transparent;
    border-radius: var(--r-xs);
    background: none;
    color: var(--text-primary);
    font-family: 'Times New Roman', Times, serif;
    font-size: 1rem;
    cursor: pointer;
    transition: background var(--t-fast), border-color var(--t-fast);
}

.greek-key:hover {
    background: var(--accent-subtle);
    border-color: rgba(79, 70, 229, 0.2);
}

.greek-key:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* ==================================
   Error highlighting — code pane
   ================================== */
.editor-error-overlay {
    position: absolute;
    pointer-events: none;
    overflow: hidden;
    z-index: 2;
}

.error-line-band {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    display: none;
    background: rgba(217, 45, 32, 0.09);
    border-left: 3px solid var(--error-strong);
    box-shadow: inset 0 0 0 1px rgba(217, 45, 32, 0.12);
    will-change: transform;
}

/* Gutter: error line marker */
.line-numbers span.ln-error {
    color: #fff;
    background: var(--error-strong);
    border-radius: 3px;
    font-weight: 600;
    cursor: pointer;
    padding-right: 2px;
}

/* Compile error bar (bottom of editor panel) */
.editor-error-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    background: var(--error-subtle);
    border-top: 1px solid var(--error-border);
    color: var(--error);
    font-size: 0.8125rem;
    font-weight: 500;
}

.editor-error-bar[hidden] {
    display: none;
}

.editor-error-bar .err-ico {
    flex-shrink: 0;
    color: var(--error-strong);
}

.editor-error-bar .err-text {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-family: var(--font-mono);
}

.error-jump-btn {
    flex-shrink: 0;
    height: 26px;
    padding: 0 10px;
    border: 1px solid var(--error-border);
    border-radius: var(--r-sm);
    background: #fff;
    color: var(--error);
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--t-fast), border-color var(--t-fast);
}

.error-jump-btn:hover {
    background: var(--error-strong);
    border-color: var(--error-strong);
    color: #fff;
}

.error-jump-btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.error-jump-btn[hidden] {
    display: none;
}

.error-dismiss-btn {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: var(--r-xs);
    background: none;
    color: var(--error);
    font-size: 1.1rem;
    line-height: 1;
    cursor: pointer;
    transition: background var(--t-fast);
}

.error-dismiss-btn:hover {
    background: rgba(217, 45, 32, 0.1);
}

.error-dismiss-btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* ==================================
   Template gallery
   ================================== */
.template-intro {
    margin: 0 0 16px;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.template-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.template-card {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 14px;
    text-align: left;
    border: 1px solid var(--border-lifted);
    border-radius: var(--r-md);
    background: #fff;
    cursor: pointer;
    transition: border-color var(--t-fast), box-shadow var(--t-lift),
                transform var(--t-lift), background var(--t-fast);
}

.template-card:hover {
    border-color: var(--pg-border);
    background: var(--pg-subtle);
    transform: translateY(-2px);
    box-shadow: var(--e2);
}

.template-card:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

.template-card-icon {
    flex-shrink: 0;
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--r-sm);
    background: var(--pg-subtle);
    color: var(--pg-text);
    border: 1px solid var(--pg-border);
}

.template-card-icon svg {
    width: 20px;
    height: 20px;
}

.template-card-body {
    min-width: 0;
}

.template-card-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0 0 3px;
}

.template-card-desc {
    font-size: 0.8125rem;
    color: var(--text-muted);
    line-height: 1.4;
    margin: 0;
}