/* =========================================
   MD2PDF — Stylesheet
   ========================================= */

/* ----- Variables & Theming ----- */

:root {
    --font-ui: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;

    --toolbar-h: 54px;
    --pane-header-h: 38px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --t-fast: 120ms var(--ease);
    --t-normal: 220ms var(--ease);
}

[data-theme="dark"] {
    --bg-app: #0d1117;
    --bg-surface: #161b22;
    --bg-raised: #1c2128;
    --bg-overlay: rgba(1, 4, 9, 0.72);

    --border: #30363d;
    --border-subtle: #21262d;

    --text-1: #e6edf3;
    --text-2: #8b949e;
    --text-3: #484f58;

    --accent: #f0883e;
    --accent-hover: #f4a261;
    --accent-subtle: rgba(240, 136, 62, 0.12);

    --btn-primary-bg: #f0883e;
    --btn-primary-fg: #0d1117;
    --btn-primary-hover: #f4a261;
    --btn-ghost-hover: rgba(255, 255, 255, 0.06);

    --scrollbar-track: transparent;
    --scrollbar-thumb: #30363d;
    --scrollbar-thumb-h: #484f58;

    --shadow: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] {
    --bg-app: #ffffff;
    --bg-surface: #f6f8fa;
    --bg-raised: #eaeef2;
    --bg-overlay: rgba(255, 255, 255, 0.78);

    --border: #d0d7de;
    --border-subtle: #e1e4e8;

    --text-1: #1f2328;
    --text-2: #656d76;
    --text-3: #8b949e;

    --accent: #cf222e;
    --accent-hover: #a40e26;
    --accent-subtle: rgba(207, 34, 46, 0.08);

    --btn-primary-bg: #1f2328;
    --btn-primary-fg: #ffffff;
    --btn-primary-hover: #32383f;
    --btn-ghost-hover: rgba(0, 0, 0, 0.05);

    --scrollbar-track: transparent;
    --scrollbar-thumb: #d0d7de;
    --scrollbar-thumb-h: #afb8c1;

    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* ----- Reset ----- */

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; overflow: hidden; }

body {
    font-family: var(--font-ui);
    background: var(--bg-app);
    color: var(--text-1);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background var(--t-normal), color var(--t-normal);
}

/* ----- Scrollbars ----- */

::-webkit-scrollbar { width: 7px; height: 7px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-thumb-h); }

/* ----- App Layout ----- */

.app { display: flex; flex-direction: column; height: 100vh; }

/* =========================================
   Toolbar
   ========================================= */

.toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--toolbar-h);
    padding: 0 16px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    gap: 12px;
    flex-shrink: 0;
    transition: background var(--t-normal), border-color var(--t-normal);
}

.toolbar-section { display: flex; align-items: center; gap: 10px; }
.toolbar-left { flex: 1; }
.toolbar-center { flex: 0 1 auto; }
.toolbar-right { flex: 1; justify-content: flex-end; }

.logo { display: flex; align-items: center; gap: 10px; user-select: none; }
.logo-icon { color: var(--accent); transition: color var(--t-normal); }
.logo-text { font-size: 17px; font-weight: 700; letter-spacing: -0.4px; }
.logo-accent { color: var(--accent); transition: color var(--t-normal); }

.file-name {
    font-size: 12px;
    font-family: var(--font-mono);
    font-weight: 500;
    color: var(--text-2);
    padding: 3px 12px;
    background: var(--bg-raised);
    border-radius: 20px;
    max-width: 260px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: background var(--t-normal), color var(--t-normal);
}

/* =========================================
   Buttons
   ========================================= */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 600;
    padding: 7px 14px;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--t-fast);
    white-space: nowrap;
    line-height: 1;
    outline: none;
}

.btn:focus-visible { box-shadow: 0 0 0 2px var(--accent); }
.btn:active { transform: scale(0.96); }

.btn-primary {
    background: var(--btn-primary-bg);
    color: var(--btn-primary-fg);
}
.btn-primary:hover { background: var(--btn-primary-hover); box-shadow: var(--shadow); }
.btn-primary.loading { opacity: 0.6; pointer-events: none; }

.btn-ghost {
    background: transparent;
    color: var(--text-2);
    padding: 7px;
    border-radius: var(--radius-sm);
}
.btn-ghost:hover { background: var(--btn-ghost-hover); color: var(--text-1); }

.btn-sm { font-size: 12px; padding: 4px 10px; }

[data-theme="dark"] .icon-sun  { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun  { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* =========================================
   View Toggle
   ========================================= */

.view-toggle {
    display: flex;
    align-items: center;
    background: var(--bg-raised);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 2px;
    gap: 2px;
}

.view-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 24px;
    border: none;
    border-radius: 4px;
    background: transparent;
    color: var(--text-3);
    cursor: pointer;
    transition: all var(--t-fast);
}

.view-btn:hover { color: var(--text-1); }

.view-btn.active {
    background: var(--bg-surface);
    color: var(--accent);
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

/* Preview-only mode */

.workspace.preview-only .editor-pane,
.workspace.preview-only .resize-handle { display: none; }

.workspace.preview-only .preview-pane { flex: 1; }

/* =========================================
   Fullscreen Button
   ========================================= */

.icon-compress { display: none; }
.icon-expand { display: block; }
:fullscreen .icon-compress { display: block; }
:fullscreen .icon-expand { display: none; }

/* =========================================
   Find & Replace Panel
   ========================================= */

.find-panel {
    display: none;
    padding: 6px 12px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    gap: 4px;
    flex-direction: column;
    animation: dropdown-in 120ms var(--ease);
}

.find-panel.open { display: flex; }

.find-row, .replace-row {
    display: flex;
    align-items: center;
    gap: 4px;
}

.replace-row { display: none; padding-top: 4px; }
.replace-row.open { display: flex; }

.find-input {
    flex: 1;
    min-width: 0;
    padding: 4px 8px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-1);
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color var(--t-fast);
}

.find-input:focus { border-color: var(--accent); }

.find-count {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-3);
    white-space: nowrap;
    min-width: 50px;
    text-align: center;
}

.find-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 24px;
    height: 24px;
    border: none;
    border-radius: 4px;
    background: transparent;
    color: var(--text-2);
    font-size: 11px;
    cursor: pointer;
    transition: all var(--t-fast);
    padding: 0 4px;
}

.find-btn:hover { background: var(--btn-ghost-hover); color: var(--text-1); }

.find-btn-text {
    font-family: var(--font-ui);
    font-size: 11px;
    font-weight: 600;
    padding: 0 8px;
}

/* =========================================
   Dropdowns
   ========================================= */

.dropdown { position: relative; }

.dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 160px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 100;
    padding: 4px;
    animation: dropdown-in 120ms var(--ease);
}

.dropdown-menu-wide { min-width: 190px; }

.dropdown.open > .dropdown-menu { display: block; }

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 8px 12px;
    font-family: var(--font-ui);
    font-size: 13px;
    font-weight: 500;
    color: var(--text-1);
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-align: left;
    transition: background var(--t-fast);
}

.dropdown-item:hover { background: var(--btn-ghost-hover); }

.dropdown-divider {
    height: 1px;
    background: var(--border);
    margin: 4px 8px;
}

@keyframes dropdown-in {
    from { opacity: 0; transform: translateY(-4px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* =========================================
   Workspace
   ========================================= */

.workspace { display: flex; flex: 1; overflow: hidden; }

.pane {
    display: flex;
    flex-direction: column;
    min-width: 0;
    overflow: hidden;
}

.editor-pane { flex: 1; }
.preview-pane { flex: 1; }

.pane-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--pane-header-h);
    padding: 0 16px;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    transition: background var(--t-normal), border-color var(--t-normal);
}

.pane-label {
    display: flex;
    align-items: center;
    gap: 7px;
    font-size: 11px;
    font-weight: 700;
    color: var(--text-2);
    text-transform: uppercase;
    letter-spacing: 0.6px;
}

.pane-actions {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* =========================================
   Counter
   ========================================= */

.counter {
    font-size: 11px;
    font-family: var(--font-mono);
    color: var(--text-3);
    white-space: nowrap;
    padding-right: 4px;
}

/* =========================================
   Style Select
   ========================================= */

.style-select {
    font-family: var(--font-ui);
    font-size: 12px;
    font-weight: 600;
    color: var(--text-2);
    background: var(--bg-raised);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 3px 8px;
    cursor: pointer;
    outline: none;
    transition: border-color var(--t-fast);
}

.style-select:hover,
.style-select:focus { border-color: var(--accent); }

/* =========================================
   Custom CSS Panel
   ========================================= */

.custom-css-panel {
    display: none;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

.custom-css-panel.open { display: block; }

.custom-css-panel textarea {
    width: 100%;
    height: 120px;
    padding: 12px 16px;
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.6;
    color: var(--text-1);
    background: var(--bg-app);
    border: none;
    outline: none;
    resize: vertical;
    transition: background var(--t-normal), color var(--t-normal);
}

.custom-css-panel textarea::placeholder { color: var(--text-3); }

/* =========================================
   Editor
   ========================================= */

.editor-container {
    position: relative;
    flex: 1;
    overflow: hidden;
}

#editor {
    width: 100%;
    height: 100%;
    padding: 24px;
    font-family: var(--font-mono);
    font-size: 13.5px;
    line-height: 1.75;
    color: var(--text-1);
    background: var(--bg-app);
    border: none;
    outline: none;
    resize: none;
    tab-size: 4;
    transition: background var(--t-normal), color var(--t-normal);
}

#editor::placeholder { color: var(--text-3); }

/* =========================================
   Drop Zone
   ========================================= */

.drop-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-overlay);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--t-normal);
    z-index: 10;
}

.drop-overlay.active { opacity: 1; pointer-events: all; }

.drop-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    padding: 44px 56px;
    border: 2px dashed var(--accent);
    border-radius: var(--radius-lg);
    color: var(--accent);
    animation: pulse-border 2.2s ease-in-out infinite;
}

.drop-content p { font-size: 15px; font-weight: 500; }

@keyframes pulse-border {
    0%, 100% { border-color: var(--accent); opacity: 1; }
    50% { border-color: var(--text-3); opacity: 0.7; }
}

/* =========================================
   Resize Handle
   ========================================= */

.resize-handle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 5px;
    cursor: col-resize;
    background: var(--bg-surface);
    border-left: 1px solid var(--border);
    border-right: 1px solid var(--border);
    flex-shrink: 0;
    transition: background var(--t-fast);
}

.resize-handle:hover,
.resize-handle.active { background: var(--accent-subtle); }

.resize-line {
    width: 2px;
    height: 28px;
    background: var(--border);
    border-radius: 1px;
    transition: background var(--t-fast);
}

.resize-handle:hover .resize-line,
.resize-handle.active .resize-line { background: var(--accent); }

/* =========================================
   Preview
   ========================================= */

.preview-container {
    flex: 1;
    overflow-y: auto;
    background: var(--bg-app);
    transition: background var(--t-normal);
}

.preview-container .markdown-body {
    padding: 32px;
    max-width: 960px;
    margin: 0 auto;
    min-height: 100%;
}

.preview-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    min-height: 280px;
    color: var(--text-3);
    font-style: italic;
    font-size: 14px;
}

/* =========================================
   Footer
   ========================================= */

.app-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 34px;
    padding: 0 16px;
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
    transition: background var(--t-normal), border-color var(--t-normal);
}

.footer-brand { font-size: 11px; color: var(--text-3); }
.footer-brand a {
    color: var(--text-2);
    text-decoration: none;
    font-weight: 600;
    transition: color var(--t-fast);
}
.footer-brand a:hover { color: var(--accent); }

.footer-links { display: flex; align-items: center; gap: 10px; }
.footer-links a {
    display: flex;
    align-items: center;
    color: var(--text-3);
    transition: color var(--t-fast), transform 80ms ease;
}
.footer-links a:hover { color: var(--accent); transform: scale(1.15); }

.star-link {
    font-size: 11px;
    font-weight: 600;
    gap: 5px;
    padding: 2px 8px;
    border: 1px solid var(--border);
    border-radius: 20px;
    transform: none !important;
}

.star-link:hover {
    color: #f0883e !important;
    border-color: #f0883e;
    transform: none !important;
}

/* =========================================
   Export Overlay
   ========================================= */

.export-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-overlay);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--t-normal);
}

.export-overlay.active { opacity: 1; pointer-events: all; }

.export-modal {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 18px;
    padding: 36px 52px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.export-spinner {
    width: 28px;
    height: 28px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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

.export-modal p { font-size: 13px; font-weight: 600; color: var(--text-2); }

/* =========================================
   Share Modal
   ========================================= */

.share-overlay {
    position: fixed;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-overlay);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--t-normal);
}

.share-overlay.active { opacity: 1; pointer-events: all; }

.share-modal {
    width: 480px;
    max-width: 90vw;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 20px;
    animation: dropdown-in 150ms var(--ease);
}

.share-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.share-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-1);
}

.share-url-row {
    display: flex;
    gap: 8px;
    margin-bottom: 12px;
}

.share-url-input {
    flex: 1;
    min-width: 0;
    padding: 8px 12px;
    font-family: var(--font-mono);
    font-size: 12px;
    color: var(--text-1);
    background: var(--bg-app);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
}

.share-url-input:focus { border-color: var(--accent); }

.share-hint {
    font-size: 11px;
    color: var(--text-3);
}

/* =========================================
   Toast
   ========================================= */

.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%) translateY(80px);
    padding: 10px 20px;
    background: var(--bg-surface);
    color: var(--text-1);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    font-size: 13px;
    font-weight: 500;
    z-index: 2000;
    opacity: 0;
    pointer-events: none;
    transition: transform 300ms var(--ease), opacity 300ms var(--ease);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* =========================================
   Responsive (< 768px)
   ========================================= */

@media (max-width: 768px) {
    .toolbar { padding: 0 12px; }
    .toolbar-center { display: none; }

    .workspace { flex-direction: column; }

    .resize-handle {
        width: 100%;
        height: 5px;
        cursor: row-resize;
        border: none;
        border-top: 1px solid var(--border);
        border-bottom: 1px solid var(--border);
    }

    .resize-line { width: 28px; height: 2px; }

    .btn-primary span { display: none; }
    .btn-primary { padding: 7px; }

    .counter { display: none; }

    #editor { padding: 16px; font-size: 13px; }
    .preview-container .markdown-body { padding: 20px; }
}

/* =========================================
   Print / PDF
   ========================================= */

@media print {
    .toolbar, .editor-pane, .resize-handle, .pane-header, .export-overlay, .app-footer, .custom-css-panel, .toast { display: none !important; }
    .workspace { display: block; }
    .preview-pane { width: 100% !important; flex: none !important; }
    .preview-container { overflow: visible; }
}