*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ===== DARK THEME (default) ===== */
:root, [data-theme="dark"] {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #1c2333;
  --bg-hover: #1f2937;
  --border-color: #30363d;
  --border-focus: #58a6ff;
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent: #58a6ff;
  --accent-hover: #79c0ff;
  --accent-glow: rgba(88, 166, 255, 0.15);
  --green: #3fb950;
  --green-glow: rgba(63, 185, 80, 0.15);
  --orange: #d29922;
  --red: #f85149;
  --purple: #bc8cff;
  --bar-bg: rgba(22, 27, 34, 0.92);
  --bar-bg-solid: rgba(22, 27, 34, 0.95);
  --sheet-bg: #161b22;
  --overlay-bg: rgba(0,0,0,0.5);
  --card-shadow: rgba(0,0,0,0.6);
  --editor-bg: #0d1117;
}

/* ===== LIGHT THEME ===== */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f6f8fa;
  --bg-tertiary: #eaeef2;
  --bg-hover: #d0d7de;
  --border-color: #d0d7de;
  --border-focus: #0969da;
  --text-primary: #1f2328;
  --text-secondary: #656d76;
  --text-muted: #8c959f;
  --accent: #0969da;
  --accent-hover: #0550ae;
  --accent-glow: rgba(9, 105, 218, 0.1);
  --green: #1a7f37;
  --green-glow: rgba(26, 127, 55, 0.1);
  --orange: #9a6700;
  --red: #cf222e;
  --purple: #8250df;
  --bar-bg: rgba(246, 248, 250, 0.92);
  --bar-bg-solid: rgba(246, 248, 250, 0.95);
  --sheet-bg: #f6f8fa;
  --overlay-bg: rgba(0,0,0,0.3);
  --card-shadow: rgba(0,0,0,0.15);
  --editor-bg: #ffffff;
}

:root {
  --font-mono: 'SF Mono', 'Fira Code', 'Cascadia Code', 'JetBrains Mono', Consolas, monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  --radius: 8px; --radius-sm: 6px; --radius-lg: 12px; --radius-xl: 16px;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

html, body { height: 100%; font-family: var(--font-sans); background: var(--bg-primary); color: var(--text-primary); overflow: hidden; -webkit-tap-highlight-color: transparent; -webkit-touch-callout: none; transition: background 0.3s ease, color 0.3s ease; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

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

.toolbar { display: flex; align-items: center; justify-content: space-between; padding: 0 16px; height: 52px; background: var(--bg-secondary); border-bottom: 1px solid var(--border-color); flex-shrink: 0; gap: 12px; z-index: 10; transition: background 0.3s ease; }
.toolbar-left { display: flex; align-items: center; gap: 14px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; letter-spacing: -0.5px; user-select: none; }
.logo-icon { width: 28px; height: 28px; background: linear-gradient(135deg, var(--accent), var(--purple)); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 800; color: #fff; font-family: var(--font-mono); }
.logo span { color: var(--accent); }
.toolbar-right { display: flex; align-items: center; gap: 8px; }

.toolbar-mobile-stats { display: none; align-items: center; font-size: 12px; font-weight: 500; color: var(--text-muted); background: var(--bg-tertiary); padding: 4px 12px; border-radius: 12px; border: 1px solid var(--border-color); }

.view-toggles { display: flex; align-items: center; gap: 4px; background: var(--bg-tertiary); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 2px; }
.view-toggles button { background: none; border: none; color: var(--text-secondary); font-size: 12px; font-weight: 500; padding: 6px 14px; border-radius: var(--radius-sm); cursor: pointer; transition: all var(--transition); font-family: var(--font-sans); white-space: nowrap; }
.view-toggles button:hover { color: var(--text-primary); background: var(--bg-hover); }
.view-toggles button.active { background: var(--accent); color: #fff; box-shadow: 0 1px 3px rgba(88, 166, 255, 0.3); }

.format-group { display: flex; align-items: center; gap: 2px; background: var(--bg-tertiary); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 2px; }
.fmt-btn { background: none; border: none; color: var(--text-secondary); font-family: var(--font-mono); font-size: 13px; font-weight: 600; padding: 5px 10px; border-radius: var(--radius-sm); cursor: pointer; transition: all var(--transition); line-height: 1; user-select: none; }
.fmt-btn:hover { color: var(--text-primary); background: var(--bg-hover); }
.fmt-btn:active { transform: scale(0.95); }

.theme-toggle { background: none; border: 1px solid var(--border-color); border-radius: var(--radius); padding: 5px 10px; cursor: pointer; color: var(--text-secondary); font-size: 16px; display: flex; align-items: center; justify-content: center; transition: all var(--transition); line-height: 1; }
.theme-toggle:hover { color: var(--text-primary); background: var(--bg-hover); }

.btn { display: inline-flex; align-items: center; gap: 6px; padding: 7px 16px; border: 1px solid var(--border-color); border-radius: var(--radius); background: var(--bg-tertiary); color: var(--text-primary); font-size: 13px; font-weight: 500; cursor: pointer; transition: all var(--transition); font-family: var(--font-sans); white-space: nowrap; }
.btn:hover { background: var(--bg-hover); border-color: var(--text-muted); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 600; }
.btn-primary:hover { background: var(--accent-hover); border-color: var(--accent-hover); }

.main { flex: 1; display: flex; overflow: hidden; position: relative; }

.editor-pane { flex: 1; display: flex; flex-direction: column; min-width: 0; position: relative; }
.pane-header { display: flex; align-items: center; justify-content: space-between; padding: 8px 16px; background: var(--bg-secondary); border-bottom: 1px solid var(--border-color); font-size: 12px; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 0.5px; flex-shrink: 0; transition: background 0.3s ease; }
.pane-header .indicator { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 6px var(--green); animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.editor-wrapper { flex: 1; position: relative; overflow: hidden; }
#editor { width: 100%; height: 100%; background: var(--editor-bg); color: var(--text-primary); border: none; outline: none; resize: none; padding: 20px 24px 150px 24px; font-family: var(--font-mono); font-size: 14px; line-height: 1.7; tab-size: 2; white-space: pre-wrap; word-wrap: break-word; overflow-wrap: break-word; overflow: auto; transition: background 0.3s ease, color 0.3s ease; }

.divider { width: 1px; background: var(--border-color); cursor: col-resize; position: relative; flex-shrink: 0; z-index: 5; transition: background var(--transition); }
.divider::after { content: ''; position: absolute; top: 50%; left: -4px; width: 9px; height: 40px; transform: translateY(-50%); border-radius: 4px; }
.divider:hover, .divider.active { background: var(--accent); box-shadow: 0 0 8px var(--accent-glow); }

.preview-pane { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.preview-content { flex: 1; overflow: auto; padding: 24px 32px; background: var(--bg-primary); transition: background 0.3s ease; }
.preview-content:focus, .markdown-body:focus { outline: none; }

.markdown-body { color: var(--text-primary); font-family: var(--font-sans); font-size: 15px; line-height: 1.75; max-width: 820px; margin: 0 auto; }
.markdown-body h1 { font-size: 2em; font-weight: 700; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; margin: 0.8em 0 0.5em; }
.markdown-body h2 { font-size: 1.5em; font-weight: 600; border-bottom: 1px solid var(--border-color); padding-bottom: 0.3em; margin: 1em 0 0.5em; }
.markdown-body h3 { font-size: 1.25em; font-weight: 600; margin: 1em 0 0.5em; }
.markdown-body h4 { font-size: 1em; font-weight: 600; margin: 1em 0 0.5em; }
.markdown-body p { margin: 0 0 1em; }
.markdown-body a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color var(--transition); }
.markdown-body a:hover { border-bottom-color: var(--accent); }
.markdown-body strong { color: var(--text-primary); font-weight: 600; }
.markdown-body em { color: var(--accent-hover); }
.markdown-body del { color: var(--text-muted); }
.markdown-body code { background: var(--bg-tertiary); padding: 2px 7px; border-radius: 4px; font-family: var(--font-mono); font-size: 0.875em; color: var(--orange); border: 1px solid var(--border-color); }
.markdown-body pre { background: var(--bg-secondary); border-radius: var(--radius); padding: 16px 20px; overflow-x: auto; margin: 0 0 1em; border: 1px solid var(--border-color); }
.markdown-body pre code { background: none; padding: 0; border-radius: 0; font-size: 0.875em; color: var(--text-primary); border: none; line-height: 1.6; }
.markdown-body blockquote { border-left: 4px solid var(--accent); padding: 0.5em 1em; margin: 0 0 1em; color: var(--text-secondary); background: var(--accent-glow); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
.markdown-body blockquote p { margin-bottom: 0; }
.markdown-body ul, .markdown-body ol { padding-left: 2em; margin: 0 0 1em; }
.markdown-body li { margin: 0.25em 0; }
.markdown-body li::marker { color: var(--accent); }
.markdown-body hr { border: none; height: 1px; background: var(--border-color); margin: 2em 0; }
.markdown-body table { width: 100%; border-collapse: collapse; margin: 0 0 1em; font-size: 0.9em; }
.markdown-body thead th { background: var(--bg-secondary); padding: 10px 14px; text-align: left; font-weight: 600; border: 1px solid var(--border-color); }
.markdown-body tbody td { padding: 8px 14px; border: 1px solid var(--border-color); }
.markdown-body tbody tr:nth-child(even) { background: var(--bg-secondary); }
.markdown-body img { max-width: 100%; border-radius: var(--radius); }
.markdown-body input[type="checkbox"] { accent-color: var(--accent); margin-right: 6px; }

.markdown-body .katex-display { display: block !important; margin: 0 auto !important; overflow-x: auto; overflow-y: hidden; padding: 0; text-align: center; }
.markdown-body .katex-display > .katex { text-align: center; font-size: 1.35em; }
.markdown-body .katex-display > .katex > .katex-html { display: block !important; text-align: center; }
.markdown-body .katex-display > .katex > .katex-html > .base { display: inline-block; }
.markdown-body p:has(> .katex-display) { text-align: center; margin: 1.6em 0 2.4em; }
.markdown-body p > .katex-display { margin: 0 auto !important; }
.markdown-body .katex { font-size: 1.25em; }
.markdown-body p > .katex:not(.katex-display) { display: inline; }
.markdown-body .katex-error { color: var(--red); font-size: 0.9em; font-family: var(--font-mono); background: rgba(248,81,73,0.1); padding: 2px 6px; border-radius: 4px; }
[data-theme="dark"] .markdown-body .katex .mord, [data-theme="dark"] .markdown-body .katex .mbin, [data-theme="dark"] .markdown-body .katex .mrel, [data-theme="dark"] .markdown-body .katex .mop, [data-theme="dark"] .markdown-body .katex .mpunct, [data-theme="dark"] .markdown-body .katex .mopen, [data-theme="dark"] .markdown-body .katex .mclose, [data-theme="dark"] .markdown-body .katex .minner { color: var(--text-primary); }

.markdown-body .mermaid-wrapper { margin: 0 0 1em; text-align: center; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 20px 16px; overflow-x: auto; }
.markdown-body .mermaid-wrapper svg { max-width: 100%; height: auto; }
.markdown-body .mermaid-error { color: var(--red); font-family: var(--font-mono); font-size: 13px; text-align: left; white-space: pre-wrap; }

.statusbar { display: flex; align-items: center; justify-content: space-between; padding: 0 16px; height: 28px; background: var(--bg-secondary); border-top: 1px solid var(--border-color); font-size: 11px; color: var(--text-muted); flex-shrink: 0; gap: 16px; transition: background 0.3s ease; }
.statusbar-left, .statusbar-right { display: flex; align-items: center; gap: 16px; }
.status-item { display: flex; align-items: center; gap: 4px; }
.status-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--green); }

.toast { position: fixed; bottom: 48px; right: 24px; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 12px 20px; font-size: 13px; color: var(--text-primary); box-shadow: 0 8px 32px rgba(0,0,0,0.4); transform: translateY(20px); opacity: 0; transition: all 0.3s ease; z-index: 100000; display: flex; align-items: center; gap: 8px; }
.toast.show { transform: translateY(0); opacity: 1; }
.toast-icon { font-size: 16px; display: flex; align-items: center; }

.dropdown { position: relative; }
.dropdown-menu { position: absolute; top: calc(100% + 6px); right: 0; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 4px; min-width: 180px; box-shadow: 0 8px 32px var(--card-shadow); z-index: 100; display: none; animation: dropdownIn 0.15s ease; }
.dropdown-menu.open { display: block; }
@keyframes dropdownIn { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: translateY(0); } }
.dropdown-item { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-radius: var(--radius-sm); font-size: 13px; color: var(--text-primary); cursor: pointer; transition: background var(--transition); border: none; background: none; width: 100%; text-align: left; font-family: var(--font-sans); }
.dropdown-item:hover { background: var(--bg-hover); }
.dropdown-item .shortcut { margin-left: auto; color: var(--text-muted); font-size: 11px; font-family: var(--font-mono); }

.sidebar-overlay { display: none; position: fixed; inset: 0; background: var(--overlay-bg); z-index: 100000; backdrop-filter: blur(2px); opacity: 0; transition: opacity 0.3s ease; }
.sidebar-overlay.open { display: block; opacity: 1; }
.sidebar { position: fixed; top: 0; left: 0; bottom: 0; width: 280px; max-width: 85vw; background: var(--bg-secondary); z-index: 100001; transform: translateX(-100%); transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1); display: flex; flex-direction: column; border-right: 1px solid var(--border-color); box-shadow: 4px 0 24px rgba(0,0,0,0.3); }
.sidebar.open { transform: translateX(0); }
.sidebar-header { padding: 16px; display: flex; align-items: center; gap: 8px; border-bottom: 1px solid var(--border-color); background: var(--bg-tertiary); }
.new-file-btn { flex: 1; display: flex; align-items: center; justify-content: center; gap: 8ps; background: var(--bg-primary); border: 1px solid var(--border-color); color: var(--text-primary); padding: 10px 14px; border-radius: var(--radius); cursor: pointer; font-size: 14px; font-weight: 500; transition: all 0.2s; }
.new-file-btn:hover { background: var(--bg-hover); border-color: var(--text-muted); }
.close-sidebar { background: none; border: none; color: var(--text-muted); padding: 8px; cursor: pointer; display: flex; border-radius: var(--radius-sm); transition: all 0.2s; }
.close-sidebar:hover { background: var(--bg-hover); color: var(--text-primary); }
@media (min-width: 769px) { .close-sidebar { display: none; } }
.sidebar-body { flex: 1; overflow-y: auto; padding: 16px; display: flex; flex-direction: column; gap: 16px; }
.sidebar-section-title { font-size: 11px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: -8px; }
.file-save-row { display: flex; gap: 6px; }
.file-save-row input { flex: 1; background: var(--bg-primary); border: 1px solid var(--border-color); color: var(--text-primary); padding: 8px 12px; border-radius: var(--radius); font-family: var(--font-sans); outline: none; font-size: 13px; min-width: 0; transition: border-color 0.2s; }
.file-save-row input:focus { border-color: var(--accent); }
.file-save-row button { background: var(--accent); color: #fff; border: none; padding: 0 14px; border-radius: var(--radius); cursor: pointer; display: flex; align-items: center; justify-content: center; transition: background 0.2s; }
.file-save-row button:hover { background: var(--accent-hover); }
.sidebar-file-list { list-style: none; display: flex; flex-direction: column; gap: 2px; margin: 0; padding: 0; }
.sidebar-file-item { display: flex; align-items: center; justify-content: space-between; padding: 10px 12px; border-radius: var(--radius); cursor: pointer; color: var(--text-primary); font-size: 13px; transition: all 0.2s; gap: 8px; }
.sidebar-file-item:hover { background: var(--bg-hover); }
.sidebar-file-item.active { background: var(--accent-glow); color: var(--accent); font-weight: 500; border-left: 2px solid var(--accent); border-radius: 0 var(--radius) var(--radius) 0; }
.sidebar-file-name-wrap { display: flex; align-items: center; gap: 10px; flex: 1; overflow: hidden; }
.sidebar-file-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sidebar-file-actions { display: none; flex-shrink: 0; gap: 4px; }
.sidebar-file-item:hover .sidebar-file-actions { display: flex; }
@media (max-width: 768px) { .sidebar-file-actions { display: flex; opacity: 0.7; } }
.sidebar-file-actions button { background: none; border: none; color: var(--text-muted); padding: 4px; border-radius: 4px; cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.2s; }
.sidebar-file-actions button:hover { color: var(--red); background: rgba(248,81,73,0.1); }

.modal-overlay { display: none; position: fixed; inset: 0; background: var(--overlay-bg); z-index: 100000; align-items: center; justify-content: center; backdrop-filter: blur(4px); }
.modal-overlay.open { display: flex; }
.modal-content { background: var(--bg-secondary); width: 90%; max-width: 440px; border-radius: var(--radius-lg); border: 1px solid var(--border-color); box-shadow: 0 10px 40px var(--card-shadow); display: flex; flex-direction: column; overflow: hidden; animation: dropdownIn 0.2s ease; }
.modal-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; border-bottom: 1px solid var(--border-color); background: var(--bg-tertiary); }
.modal-header h3 { font-size: 16px; font-weight: 600; margin: 0; color: var(--text-primary); }
.modal-header button { background: none; border: none; color: var(--text-muted); cursor: pointer; padding: 4px; display: flex; }
.modal-header button:hover { color: var(--text-primary); }

.share-modal-body { padding: 20px; display: flex; flex-direction: column; gap: 24px; }
.share-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
@media (max-width: 400px) { .share-grid { grid-template-columns: repeat(3, 1fr); } }
.share-btn { display: flex; flex-direction: column; align-items: center; gap: 8px; background: none; border: none; cursor: pointer; color: var(--text-primary); font-size: 11px; font-weight: 500; font-family: var(--font-sans); transition: all 0.2s; }
.share-icon-wrap { width: 48px; height: 48px; border-radius: 50%; display: flex; align-items: center; justify-content: center; background: var(--bg-tertiary); color: var(--text-primary); transition: all 0.2s; border: 1px solid transparent; }
.share-icon-wrap .icon { width: 20px; height: 20px; }
.share-btn:hover .share-icon-wrap { transform: translateY(-3px); box-shadow: 0 4px 12px var(--card-shadow); }

.share-btn.github:hover .share-icon-wrap { background: #333; color: #fff; border-color: #333; }
[data-theme="light"] .share-btn.github:hover .share-icon-wrap { background: #24292e; color: #fff; border-color: #24292e; }
.share-btn.whatsapp:hover .share-icon-wrap { background: #25D366; color: #fff; border-color: #25D366; }
.share-btn.twitter:hover .share-icon-wrap { background: #000; color: #fff; border-color: #333; }
[data-theme="light"] .share-btn.twitter:hover .share-icon-wrap { background: #000; color: #fff; border-color: #000; }
.share-btn.facebook:hover .share-icon-wrap { background: #1877F2; color: #fff; border-color: #1877F2; }
.share-btn.telegram:hover .share-icon-wrap { background: #229ED9; color: #fff; border-color: #229ED9; }
.share-btn.reddit:hover .share-icon-wrap { background: #FF4500; color: #fff; border-color: #FF4500; }
.share-btn.linkedin:hover .share-icon-wrap { background: #0A66C2; color: #fff; border-color: #0A66C2; }
.share-btn.email:hover .share-icon-wrap { background: var(--orange); color: #fff; border-color: var(--orange); }
.share-btn.copy:hover .share-icon-wrap { background: var(--text-secondary); color: #fff; border-color: var(--text-secondary); }
.share-btn.print:hover .share-icon-wrap { background: var(--purple); color: #fff; border-color: var(--purple); }
.share-btn.native:hover .share-icon-wrap { background: var(--accent); color: #fff; border-color: var(--accent); }

.tour-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.6); z-index: 100000; mix-blend-mode: hard-light; pointer-events: none; transition: all 0.3s ease; }
.tour-overlay.active { display: block; }
.tour-highlight { z-index: 100003 !important; pointer-events: auto; background: var(--bg-secondary) !important; border-radius: var(--radius); box-shadow: 0 0 0 4px var(--accent); }
.tour-static-fix { position: relative !important; }
.tour-tooltip { display: none; position: fixed; z-index: 100005; background: var(--bg-secondary); border: 1px solid var(--border-color); width: 280px; max-width: calc(100vw - 30px); border-radius: var(--radius-lg); box-shadow: 0 10px 30px rgba(0,0,0,0.6); padding: 16px; flex-direction: column; gap: 10px; transition: top 0.3s ease, left 0.3s ease, transform 0.3s ease; }
.tour-tooltip.active { display: flex; }
.tour-title { font-weight: 700; font-size: 15px; color: var(--accent); }
.tour-text { font-size: 13px; color: var(--text-primary); line-height: 1.5; }
.tour-nav { display: flex; justify-content: space-between; align-items: center; margin-top: 8px; border-top: 1px solid var(--border-color); padding-top: 12px; gap: 8px; }
.tour-nav button { background: var(--bg-tertiary); border: 1px solid var(--border-color); color: var(--text-primary); padding: 6px 12px; border-radius: var(--radius); cursor: pointer; font-size: 12px; font-weight: 500; transition: all 0.2s; }
.tour-nav button:hover { background: var(--bg-hover); }
.tour-nav button.primary { background: var(--accent); color: #fff; border: none; }
.tour-nav button.primary:hover { background: var(--accent-hover); }
.tour-step-ind { font-size: 11px; color: var(--text-muted); font-weight: 600; }

.editor-only .preview-pane, .editor-only .divider { display: none; }
.preview-only .editor-pane, .preview-only .divider { display: none; }
.export-loading { position: fixed; inset: 0; background: rgba(0,0,0,0.7); z-index: 99999; display: none; align-items: center; justify-content: center; backdrop-filter: blur(12px); }
.export-loading.active { display: flex; }
.spinner { width: 48px; height: 48px; border: 3px solid var(--border-color); border-top-color: var(--accent); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.export-loading span { margin-top: 16px; color: var(--text-secondary); font-size: 14px; }
.export-loading-inner { display: flex; flex-direction: column; align-items: center; }

@media print {
  body * { visibility: hidden; }
  #previewPane, #previewPane * { visibility: visible; }
  #previewPane { position: absolute; left: 0; top: 0; width: 100%; height: auto; display: block !important; padding: 0 !important; }
  .pane-header, .statusbar, .toolbar, .mobile-tab-bar, .mobile-format-bar { display: none !important; }
  .preview-content { overflow: visible !important; height: auto !important; padding: 0 !important; }
  .markdown-body { max-width: 100% !important; padding: 20px !important; }
}

.mobile-tab-bar { display: none; position: fixed; bottom: 0; left: 0; right: 0; height: calc(56px + var(--safe-bottom)); padding-bottom: var(--safe-bottom); background: var(--bar-bg); backdrop-filter: blur(20px) saturate(180%); -webkit-backdrop-filter: blur(20px) saturate(180%); border-top: 1px solid var(--border-color); z-index: 50; align-items: center; justify-content: space-around; padding-left: 8px; padding-right: 8px; }
.mobile-tab { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; background: none; border: none; color: var(--text-muted); font-size: 10px; font-weight: 600; font-family: var(--font-sans); padding: 6px 4px; border-radius: var(--radius); cursor: pointer; transition: all var(--transition); -webkit-tap-highlight-color: transparent; min-width: 52px; position: relative; }
.mobile-tab .icon { width: 15px; height: 15px; transition: all var(--transition); }
.mobile-tab.active { color: var(--accent); }
.mobile-tab.active::before { content: ''; position: absolute; top: -1px; left: 50%; transform: translateX(-50%); width: 20px; height: 3px; background: var(--accent); border-radius: 0 0 3px 3px; }

.mobile-format-bar { display: none; position: fixed; bottom: calc(56px + var(--safe-bottom)); left: 0; right: 0; height: 44px; background: var(--bar-bg-solid); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-top: 1px solid var(--border-color); z-index: 55; align-items: stretch; padding: 0; }
.mobile-format-scroll { display: flex; align-items: center; overflow-x: auto; -webkit-overflow-scrolling: touch; flex: 1; min-width: 0; scrollbar-width: none; padding: 0 2px 0 4px; }
.mobile-format-scroll::-webkit-scrollbar { display: none; }
.mfmt-btn { background: none; border: none; color: var(--text-secondary); font-family: var(--font-mono); font-size: 16px; font-weight: 700; padding: 8px 10px; border-radius: var(--radius-sm); cursor: pointer; min-width: 40px; min-height: 44px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.mfmt-fab { background: var(--accent); border: none; color: #fff; cursor: pointer; display: flex; align-items: center; justify-content: center; width: 44px; flex-shrink: 0; border-radius: 0; }
.mfmt-theme-fixed { background: none; border: none; color: var(--text-secondary); cursor: pointer; display: flex; align-items: center; justify-content: center; width: 44px; flex-shrink: 0; border-left: 1px solid var(--border-color); }

.heading-picker-wrap { position: relative; }
.heading-picker { display: none; position: absolute; bottom: calc(100% + 6px);  background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 4px; box-shadow: 0 4px 16px var(--card-shadow); z-index: 200; min-width: 130px; animation: dropdownIn 0.15s ease; }
.heading-picker.open { display: block; }
.heading-picker-item { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-radius: var(--radius-sm); font-size: 13px; font-weight: 600; color: var(--text-primary); cursor: pointer; border: none; background: none; width: 100%; text-align: left; transition: background var(--transition); font-family: var(--font-sans); }
.heading-picker-item:hover { background: var(--bg-hover); }
.heading-picker-item span { font-weight: 400; color: var(--text-muted); font-size: 11px; margin-left: auto; }
.heading-picker-mobile-fixed { display: none; position: fixed; background: var(--bg-secondary); border: 1px solid var(--border-color); border-radius: var(--radius); padding: 4px; box-shadow: 0 4px 16px var(--card-shadow); z-index: 200; min-width: 120px; animation: dropdownIn 0.15s ease; }
.heading-picker-mobile-fixed.open { display: block; }
.fmt-btn-wrap { position: relative; }
.fmt-btn-wrap .heading-picker { bottom: auto; top: calc(100% + 6px); }

.fab-backdrop { display: none; position: fixed; inset: 0; background: var(--overlay-bg); backdrop-filter: blur(4px); -webkit-backdrop-filter: blur(4px); z-index: 58; opacity: 0; transition: opacity 0.3s ease; }
.fab-backdrop.open { opacity: 1; }
.fab-card { display: none; position: fixed; bottom: calc(104px + var(--safe-bottom)); right: 12px; left: 12px; background: var(--sheet-bg); border: 1px solid var(--border-color); border-radius: var(--radius-xl); padding: 20px 12px 16px; z-index: 59; box-shadow: 0 8px 40px var(--card-shadow); transform: translateY(20px) scale(0.95); opacity: 0; transition: all 0.3s cubic-bezier(0.32, 0.72, 0, 1); }
.fab-card.open { transform: translateY(0) scale(1); opacity: 1; }
.fab-card-title { font-size: 13px; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.8px; margin-bottom: 12px; text-align: center; }
.fab-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 6px; }
.fab-grid-item { display: flex; flex-direction: column; align-items: center; gap: 4px; padding: 10px 4px 8px; border-radius: var(--radius-lg); background: var(--bg-tertiary); border: none; cursor: pointer; transition: all 0.2s ease; font-family: var(--font-sans); }
.fab-grid-icon { width: 32px; height: 32px; border-radius: 10px; display: flex; align-items: center; justify-content: center; }
.fab-grid-label { font-size: 10px; font-weight: 600; color: var(--text-secondary); text-align: center; line-height: 1.2; }

.mobile-sheet-overlay { display: none; position: fixed; inset: 0; background: var(--overlay-bg); z-index: 200; opacity: 0; transition: opacity 0.3s ease; }
.mobile-sheet-overlay.open { display: block; opacity: 1; }
.mobile-sheet { position: fixed; bottom: 0; left: 0; right: 0; background: var(--sheet-bg); border-radius: var(--radius-xl) var(--radius-xl) 0 0; padding: 0 20px calc(20px + var(--safe-bottom)); z-index: 201; transform: translateY(100%); transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1); }
.mobile-sheet.open { transform: translateY(0); }
.sheet-handle { width: 36px; height: 5px; background: var(--border-color); border-radius: 3px; margin: 10px auto 16px; }
.sheet-title { font-size: 18px; font-weight: 700; margin-bottom: 16px; color: var(--text-primary); }
.sheet-actions { display: flex; flex-direction: column; gap: 4px; }
.sheet-action { display: flex; align-items: center; gap: 14px; padding: 14px 12px; border-radius: var(--radius-lg); background: none; border: none; color: var(--text-primary); font-size: 16px; font-weight: 500; cursor: pointer; width: 100%; text-align: left; }
.sheet-action-icon { width: 36px; height: 36px; border-radius: 10px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.sheet-action-text { display: flex; flex-direction: column; gap: 2px; }
.sheet-action-label { font-weight: 600; font-size: 15px; }
.sheet-action-desc { font-size: 12px; color: var(--text-muted); font-weight: 400; }

.editor-pane, .preview-pane { transition: transform 0.35s cubic-bezier(0.32, 0.72, 0, 1), opacity 0.25s ease; }

@media (max-width: 768px) {
  .toolbar-right, .statusbar, .divider, .format-group, .dropdown { display: none; }
  .mobile-tab-bar { display: flex; }
  .mobile-format-bar { display: flex; }
  .toolbar-mobile-stats { display: flex; }
  .main { flex-direction: column; padding-top: 40px; padding-bottom: calc(100px + var(--safe-bottom)); }
  .editor-pane, .preview-pane { position: absolute; inset: 0; flex: none; width: 100%; height: 100%; }
  .editor-pane { transform: translateX(0); z-index: 2; }
  .preview-pane { transform: translateX(100%); z-index: 1; }
  .app.mobile-editor .editor-pane { transform: translateX(0); opacity: 1; pointer-events: auto; }
  .app.mobile-editor .preview-pane { transform: translateX(100%); opacity: 0; pointer-events: none; }
  .app.mobile-preview .editor-pane { transform: translateX(-30%); opacity: 0; pointer-events: none; }
  .app.mobile-preview .preview-pane { transform: translateX(0); opacity: 1; pointer-events: auto; }
  .app.mobile-split .editor-pane { position: absolute; top: 0; left: 0; right: 0; flex: none; width: 100%; height: 50%; transform: none; opacity: 1; pointer-events: auto; z-index: 2; border-bottom: 1px solid var(--border-color); }
  .app.mobile-split .preview-pane { position: absolute; top: 50%; left: 0; right: 0; bottom: 0; flex: none; width: 100%; height: 50%; transform: none; opacity: 1; pointer-events: auto; z-index: 1; }
  .app.mobile-split .preview-pane .pane-header, .app.mobile-split .editor-pane .pane-header { display: none; }
  .pane-header { padding: 6px 16px; font-size: 11px; }
  #editor { padding: 16px 16px 200px 16px; font-size: 15px; }
  .preview-content { padding: 16px 20px; padding-bottom: 96px; }
  .markdown-body { font-size: 16px; }
  .toast { bottom: calc(112px + var(--safe-bottom)); right: 16px; left: 16px; text-align: center; justify-content: center; }
}

@media (min-width: 769px) {
  .mobile-tab-bar, .fab-backdrop, .fab-card, .mobile-format-bar, .mobile-sheet-overlay, .mobile-sheet, .heading-picker-mobile-fixed { display: none !important; }
}

.icon { display: inline-block; vertical-align: middle; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; width: 13px; height: 13px; }
.fmt-btn .icon, .mfmt-btn .icon, .theme-toggle .icon, .fab-grid-icon .icon { width: 13px; height: 13px; }
.btn .icon, .toast-icon .icon { width: 12px; height: 12px; }
.mobile-tab .icon { width: 15px; height: 15px; transition: all var(--transition); }
.sheet-action-icon .icon { width: 14px; height: 14px; }
/* ===== IMPORT MODAL DROPZONE ===== */
#dropZone.drag-over { 
  border-color: var(--accent); 
  background: var(--accent-glow); 
}