@font-face { font-family: 'Inter'; font-style: normal; font-weight: 400; font-display: swap; src: url('../vendor/fonts/Inter-400.ttf') format('truetype'); }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 500; font-display: swap; src: url('../vendor/fonts/Inter-500.ttf') format('truetype'); }
@font-face { font-family: 'Inter'; font-style: normal; font-weight: 600; font-display: swap; src: url('../vendor/fonts/Inter-600.ttf') format('truetype'); }
* { margin: 0; padding: 0; box-sizing: border-box; }

/* ---- Theme Variables (Light) ---- */
:root {
  --bg-primary: #F0EFED;
  --bg-surface: #fff;
  --bg-surface-hover: #f5f4f2;
  --bg-input: #f5f4f2;
  --bg-overlay: rgba(255,255,255,0.95);
  --bg-toolbar: rgba(255,255,255,0.85);
  --bg-logo: #1a1a1a;
  --text-primary: #1a1a1a;
  --text-secondary: #555;
  --text-tertiary: #888;
  --text-quaternary: #999;
  --text-heading: #3d3d3d;
  --border-primary: #e0ddd9;
  --border-secondary: #f0efed;
  --border-tertiary: #f5f4f2;
  --shadow-sm: rgba(0,0,0,0.06);
  --shadow-md: rgba(0,0,0,0.12);
  --shadow-lg: rgba(0,0,0,0.18);
  --btn-primary-bg: #1a1a1a;
  --btn-primary-hover: #333;
  --btn-primary-active: #000;
  --btn-primary-text: #fff;
  --accent-color: #1a1a1a;
  --scrollbar-thumb: #ddd;
  --scene-bg: 0xF0EFED;
  --viewcube-text: #333;
  --viewcube-face-x: #fff5f5;
  --viewcube-face-y: #f5fff5;
  --viewcube-face-z: #f5f5ff;
  color-scheme: light;
}

/* ---- Theme Variables (Dark) ---- */
[data-theme="dark"] {
  --bg-primary: #1a1a1e;
  --bg-surface: #2a2a2e;
  --bg-surface-hover: #333338;
  --bg-input: #333338;
  --bg-overlay: rgba(42,42,46,0.95);
  --bg-toolbar: rgba(42,42,46,0.85);
  --bg-logo: #fff;
  --text-primary: #e8e8ec;
  --text-secondary: #b0b0b8;
  --text-tertiary: #888890;
  --text-quaternary: #707078;
  --text-heading: #c0c0c8;
  --border-primary: #404048;
  --border-secondary: #333338;
  --border-tertiary: #2e2e34;
  --shadow-sm: rgba(0,0,0,0.2);
  --shadow-md: rgba(0,0,0,0.3);
  --shadow-lg: rgba(0,0,0,0.4);
  --btn-primary-bg: #e8e8ec;
  --btn-primary-hover: #d0d0d8;
  --btn-primary-active: #fff;
  --btn-primary-text: #1a1a1e;
  --accent-color: #e8e8ec;
  --scrollbar-thumb: #555;
  --scene-bg: 0x1a1a1e;
  --viewcube-text: #ccc;
  --viewcube-face-x: #3a2828;
  --viewcube-face-y: #283a28;
  --viewcube-face-z: #28283a;
  color-scheme: dark;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary); color: var(--text-primary); overflow: hidden;
}
.container { display: flex; flex-direction: column; height: 100vh; }

/* ---- App Header (always visible) ---- */
.app-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.6rem 1.25rem; background: var(--bg-surface);
  box-shadow: 0 1px 3px var(--shadow-sm);
  z-index: 350; position: relative;
}
.app-header .header-left { display: flex; align-items: center; gap: 0.1rem; }
.app-header h1 { font-size: 0.95rem; font-weight: 600; color: var(--text-primary); letter-spacing: -0.01em; }
.app-header .header-actions { display: flex; align-items: center; gap: 0.5rem; }

/* ---- Logo icon ---- */
.header-logo {
  width: 38px; height: 38px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
}
[data-theme="dark"] .header-logo svg { stroke: #1a1a1e; }
.header-logo svg { width: 18px; height: 18px; }

/* ---- Sidebar toggle (mobile only) ---- */
.sidebar-toggle {
  display: none; width: 36px; height: 36px; border: 1px solid var(--border-primary);
  border-radius: 8px; background: var(--bg-surface); cursor: pointer;
  align-items: center; justify-content: center; flex-shrink: 0;
}
.sidebar-toggle svg { width: 18px; height: 18px; color: var(--text-secondary); }
.sidebar-toggle:hover { background: var(--bg-surface-hover); }

/* ---- Upload button ---- */
.upload-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  background: var(--btn-primary-bg); color: var(--btn-primary-text); border: none; border-radius: 8px;
  font-size: 0.85rem; font-weight: 500; cursor: pointer; user-select: none;
  font-family: inherit;
  box-shadow: 0 2px 8px var(--shadow-md);
  transition: background 0.2s cubic-bezier(0.4,0,0.2,1),
              box-shadow 0.2s cubic-bezier(0.4,0,0.2,1),
              transform 0.2s cubic-bezier(0.4,0,0.2,1);
}
.upload-btn:hover {
  background: var(--btn-primary-hover);
  box-shadow: 0 4px 16px var(--shadow-md);
  transform: translateY(-1px);
}
.upload-btn:active {
  background: var(--btn-primary-active);
  box-shadow: 0 1px 4px var(--shadow-sm);
  transform: translateY(0) scale(0.97);
  transition-duration: 0.1s;
}
.upload-btn:disabled { opacity: 0.4; cursor: not-allowed; box-shadow: none; transform: none; }
.upload-btn svg { width: 16px; height: 16px; }
.upload-btn-sm { height: 36px; padding: 0 0.85rem; font-size: 0.8rem; border-radius: 8px; }

/* ---- Secondary button ---- */
.btn-secondary {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.5rem 1rem;
  background: var(--bg-surface); color: var(--text-primary); border: 1px solid var(--border-primary);
  border-radius: 8px; font-size: 0.85rem; font-weight: 500;
  cursor: pointer; font-family: inherit;
  transition: background 0.2s, border-color 0.2s;
}
.btn-secondary:hover { background: var(--bg-surface-hover); border-color: var(--border-primary); }
.btn-secondary:disabled { opacity: 0.4; cursor: not-allowed; }

/* ---- Main ---- */
.main-content { display: flex; flex: 1; overflow: hidden; position: relative; }

/* ---- Viewport (background matches body for seamless look) ---- */
.viewport { flex: 1; position: relative; background: var(--bg-primary); overflow: hidden; }
#canvas { position: absolute; top: 0; left: 0; width: 100%; height: 100%; display: block; }

/* ---- Viewport overlays (flexbox centering for responsive) ---- */
#emptyState {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  text-align: center; padding: 2rem; gap: 0.5rem;
  color: var(--text-quaternary);
  pointer-events: none; z-index: 10;
}
.upload-icon {
  width: 72px; height: 72px; margin-bottom: 0.5rem;
  opacity: 0.18; filter: invert(0);
}
[data-theme="dark"] .upload-icon { opacity: 0.22; filter: invert(1); }
.upload-title { font-size: 1.05rem; font-weight: 500; color: var(--text-tertiary); margin: 0; }
.upload-formats { font-size: 0.82rem; color: var(--text-quaternary); margin: 0; letter-spacing: 0.01em; }
.upload-limit { font-size: 0.78rem; color: var(--text-quaternary); margin: 0; opacity: 0.75; }
.upload-note { font-size: 0.74rem; color: var(--text-quaternary); margin: 0.25rem 0 0; opacity: 0.6; max-width: 420px; line-height: 1.5; }
#loadingBox {
  position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  display: none; align-items: center; justify-content: center;
  text-align: center; z-index: 15;
}
.loading-inner {
  background: var(--bg-overlay); padding: 2rem 2.5rem;
  border-radius: 16px; pointer-events: auto;
  box-shadow: 0 4px 24px var(--shadow-sm);
}
.progress-status {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 0.35rem; margin-top: 0.5rem;
}
#loadingBox p { color: var(--text-secondary); font-size: 0.9rem; margin: 0; }
.progress-badge-row {
  width: 100%;
  display: flex;
  justify-content: center;
}
.progress-badge-row .analysis-mode-badge {
  margin-left: 0;
}
.spinner {
  width: 36px; height: 36px; border: 3px solid var(--border-primary);
  border-top-color: var(--accent-color); border-radius: 50%;
  animation: spin 0.8s linear infinite; margin: 0 auto 0.75rem;
}
@keyframes spin { to { transform: rotate(360deg); } }
.analysis-mode-badge {
  display: none; font-size: 0.72rem; font-weight: 600; letter-spacing: 0.02em;
  padding: 2px 8px; border-radius: 8px; margin-left: 4px;
  align-items: center;
}
.analysis-mode-badge.mode-local {
  background: #e8f5e9; color: #2e7d32; border: 1px solid #a5d6a7;
}
.analysis-mode-badge.mode-cloud {
  background: #e3f2fd; color: #1565c0; border: 1px solid #90caf9;
}
.analysis-mode-badge.mode-gpu {
  background: #fff3e0; color: #e65100; border: 1px solid #ffcc80;
}
#errorMsg {
  display: none; position: absolute; top: 16px; left: 50%; transform: translateX(-50%);
  background: #DC2626; color: #fff; padding: 0.75rem 1.5rem; border-radius: 8px; z-index: 20;
  max-width: 80%; font-size: 0.85rem; font-weight: 500;
  box-shadow: 0 4px 16px rgba(220,38,38,0.25);
}

/* ---- Sidebar (floating white container) ---- */
.sidebar-backdrop {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.2); z-index: 299;
}
.sidebar {
  width: 300px; flex-shrink: 0;
  background: var(--bg-surface);
  display: flex; flex-direction: column; overflow-y: auto;
  border-radius: 4px;
  margin: 10px 12px 12px 0;
  box-shadow: 0 2px 16px var(--shadow-sm);
  transition: transform 0.25s ease, opacity 0.25s ease;
  z-index: 300;
}
.sidebar::-webkit-scrollbar { width: 4px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 2px; }

/* ---- Sidebar header (logo + title + upload, desktop only) ---- */
.sidebar-header {
  padding: 1.25rem; border-bottom: 1px solid var(--border-secondary);
}
.sidebar-header-top {
  display: flex; align-items: center; gap: 0.75rem;
  margin-bottom: 1rem;
}
.sidebar-header h1 {
  font-size: 1rem; font-weight: 600; color: var(--text-primary);
  letter-spacing: -0.01em;
}
.sidebar-header .upload-btn { width: 100%; }

/* ---- Panels ---- */
.panel { padding: 1.25rem; border-bottom: 1px solid var(--border-secondary); }
.panel:last-child { border-bottom: none; }
.panel h3 {
  font-size: 0.75rem; font-weight: 600; margin-bottom: 0.75rem;
  color: var(--text-heading); text-transform: uppercase; letter-spacing: 0.06em;
}
/* ---- Panel collapse/expand ---- */
.panel-toggle {
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; user-select: none;
}
.panel-arrow {
  width: 14px; height: 14px; flex-shrink: 0; color: var(--text-quaternary);
  transition: transform 0.2s ease;
}
.panel.collapsed .panel-arrow { transform: rotate(-90deg); }
.panel.collapsed .panel-content {
  display: none;
}
.panel.collapsed .panel-toggle { margin-bottom: 0; }

/* ---- Legend ---- */
.legend-wrap { display: flex; flex-direction: column; gap: 0.4rem; }
.legend-bar {
  width: 100%; height: 16px; border-radius: 6px;
  background: linear-gradient(to right, #CC0000 0%, #E07000 50%, #FFB800 100%);
}
.legend-labels {
  display: flex; flex-direction: row; justify-content: space-between;
  font-size: 0.8rem; color: var(--text-tertiary);
}

/* ---- Stats ---- */
.stat {
  display: flex; justify-content: space-between; padding: 0.5rem 0;
  border-bottom: 1px solid var(--border-tertiary);
}
.stat:last-child { border-bottom: none; }
.stat-label { color: var(--text-tertiary); font-size: 0.82rem; }
.stat-label[data-tip] {
  position: relative; cursor: help;
  border-bottom: 1px dashed #ccc;
}
.stat-label[data-tip]::after {
  content: attr(data-tip);
  position: absolute; left: 0; bottom: calc(100% + 6px);
  background: var(--accent-color); color: var(--btn-primary-text); font-size: 0.72rem; font-weight: 400;
  padding: 0.35rem 0.6rem; border-radius: 6px; white-space: nowrap;
  pointer-events: none; opacity: 0; transform: translateY(4px);
  transition: opacity 0.15s, transform 0.15s;
  z-index: 50;
}
.stat-label[data-tip]:hover::after { opacity: 1; transform: translateY(0); }
.stat-value { color: var(--text-primary); font-weight: 600; font-size: 0.82rem; font-variant-numeric: tabular-nums; }
.cloud-consent-file {
  display: inline-block;
  max-width: min(100%, 24rem);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  vertical-align: bottom;
}
.cloud-consent-warning {
  margin: 0.75rem 0 0;
  padding: 0.7rem 0.8rem;
  border-radius: 8px;
  border: 1px solid rgba(180, 83, 9, 0.28);
  background: rgba(245, 158, 11, 0.12);
  color: #9a3412;
  font-size: 0.8rem;
  line-height: 1.45;
}
[data-theme="dark"] .cloud-consent-warning {
  border-color: rgba(251, 191, 36, 0.26);
  background: rgba(245, 158, 11, 0.16);
  color: #fcd34d;
}

/* ---- Simplified notice ---- */
.mi-simplified-notice {
  background: var(--bg-surface-hover);
  border-left: 3px solid #fb8c00;
  padding: 0.4rem 0.6rem;
  margin-bottom: 0.6rem;
  border-radius: 4px;
  font-size: 0.76rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ---- Settings rows ---- */
.setting-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 0.35rem 0;
}
.setting-row label { color: var(--text-secondary); font-size: 0.82rem; }
.setting-input { display: flex; align-items: center; gap: 0.3rem; }
.setting-input input[type="number"] {
  width: 70px; padding: 0.35rem 0.45rem; background: var(--bg-input); border: 1px solid var(--border-primary);
  color: var(--text-primary); border-radius: 6px; font-size: 0.82rem; text-align: right;
  font-family: inherit; font-variant-numeric: tabular-nums;
  transition: border-color 0.15s;
}
.setting-select {
  width: calc(70px + 0.3rem + 1.5rem); padding: 0.35rem 1.65rem 0.35rem 0.45rem;
  background: var(--bg-input); border: 1px solid var(--border-primary);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 12 12' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M3 4.5 6 7.5 9 4.5' fill='none' stroke='%236b7280' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 0.55rem center; background-size: 10px;
  color: var(--text-primary); border-radius: 6px; font-size: 0.82rem;
  font-family: inherit; appearance: none;
  transition: border-color 0.15s;
}
[data-theme="dark"] .setting-select {
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 12 12' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M3 4.5 6 7.5 9 4.5' fill='none' stroke='%239ca3af' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
}
.setting-input input[type="number"]:focus, .setting-select:focus { border-color: var(--accent-color); outline: none; }
.setting-input span { color: var(--text-quaternary); font-size: 0.8rem; min-width: 1.5rem; }

/* ---- Range sliders (styled) ---- */
input[type="range"] {
  -webkit-appearance: none; appearance: none; height: 4px;
  background: var(--border-primary); border-radius: 2px; outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 14px; height: 14px;
  background: var(--accent-color); border-radius: 50%; cursor: pointer;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

/* ---- Unit toggle (segmented) ---- */
.unit-toggle {
  display: inline-flex; background: var(--bg-input); border-radius: 8px;
  padding: 2px; gap: 2px;
}
.unit-btn {
  padding: 0.25rem 0.65rem; border-radius: 8px; border: none;
  background: transparent; color: var(--text-tertiary); cursor: pointer;
  font-size: 0.78rem; font-weight: 500; font-family: inherit;
  transition: background 0.15s, color 0.15s;
}
.unit-btn.active { background: var(--bg-surface); color: var(--text-primary); box-shadow: 0 1px 3px var(--shadow-sm); }

/* ---- Checkbox styled ---- */
.checkbox-row {
  display: flex; align-items: center; gap: 0.4rem;
  color: var(--text-secondary); font-size: 0.82rem; cursor: pointer;
}
.checkbox-row input[type="checkbox"] {
  width: 16px; height: 16px; accent-color: var(--accent-color); cursor: pointer;
}

/* ---- Progress bar ---- */
.progress-track {
  width: 200px; height: 6px; background: #e0ddd9; border-radius: 3px;
  margin: 0 auto 0.5rem; overflow: hidden;
}
.progress-fill {
  width: 0%; height: 100%; border-radius: 3px;
  background: linear-gradient(90deg, var(--accent-color), var(--text-secondary));
  transition: width 0.3s;
}

/* ---- Help icon ---- */
.help-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 16px; height: 16px; border-radius: 50%;
  border: 1.5px solid var(--text-quaternary); background: none; color: var(--text-quaternary);
  font-size: 0.6rem; font-weight: 700; font-family: inherit;
  cursor: pointer; margin-left: 0.3rem; flex-shrink: 0;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
  line-height: 1; padding: 0;
}
.help-icon:hover { border-color: var(--text-primary); color: var(--text-primary); background: var(--bg-input); }

/* ---- Slides popup ---- */
.slides-backdrop {
  display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.4); z-index: 900;
  align-items: center; justify-content: center;
  opacity: 0; transition: opacity 0.2s;
}
.slides-backdrop.open { display: flex; opacity: 1; }
.slides-popup {
  background: var(--bg-surface); border-radius: 16px; width: 420px; max-width: 92vw;
  box-shadow: 0 8px 40px var(--shadow-lg);
  overflow: hidden; position: relative;
  animation: popIn 0.25s cubic-bezier(0.4,0,0.2,1);
}
@keyframes popIn { from { transform: scale(0.92); opacity: 0; } to { transform: scale(1); opacity: 1; } }
.slides-popup-close {
  position: absolute; top: 12px; right: 12px; z-index: 10;
  width: 28px; height: 28px; border-radius: 50%;
  border: none; background: rgba(0,0,0,0.06); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  color: #666; font-size: 1.1rem; line-height: 1;
  transition: background 0.15s;
}
.slides-popup-close:hover { background: rgba(0,0,0,0.12); }
.slides-viewport { position: relative; overflow: hidden; }
.slides-track {
  display: flex; transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
}
.slide-card {
  min-width: 100%; padding: 2rem 2rem 1.25rem; box-sizing: border-box;
}
.slide-card h4 {
  font-size: 0.9rem; font-weight: 600; color: var(--text-primary);
  margin-bottom: 0.75rem; letter-spacing: -0.01em;
}
.slide-card p {
  font-size: 0.78rem; color: var(--text-secondary); line-height: 1.65; margin-bottom: 0.5rem;
}
.slide-card .accent { color: var(--text-primary); font-weight: 600; }
.slide-card .code {
  display: inline; background: var(--bg-input); padding: 0.1rem 0.35rem;
  border-radius: 4px; font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.72rem; color: #c7254e;
}
.slide-card .diagram {
  background: var(--bg-input); border: 1px solid var(--border-primary); border-radius: 8px;
  padding: 1rem; margin: 0.6rem 0; text-align: center;
}
.slide-card .diagram svg { max-width: 100%; height: auto; }
.slide-card .hint {
  background: var(--bg-input); border-radius: 8px; padding: 0.6rem 0.8rem;
  font-size: 0.72rem; color: var(--text-secondary); margin-top: 0.5rem; line-height: 1.55;
}
.slide-card .hint strong { color: var(--text-primary); }
/* Slide enter animation */
.slide-card .reveal-item {
  opacity: 0; transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}
.slide-card.active .reveal-item {
  opacity: 1; transform: translateY(0);
}
.slide-card.active .reveal-item:nth-child(2) { transition-delay: 0.08s; }
.slide-card.active .reveal-item:nth-child(3) { transition-delay: 0.16s; }
.slide-card.active .reveal-item:nth-child(4) { transition-delay: 0.24s; }
.slide-card.active .reveal-item:nth-child(5) { transition-delay: 0.32s; }
/* Navigation bar */
.slides-nav {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.75rem 1.25rem; border-top: 1px solid var(--border-secondary);
}
.slides-dots { display: flex; gap: 6px; }
.slides-dot {
  width: 7px; height: 7px; border-radius: 50%; background: var(--border-primary);
  transition: background 0.2s, transform 0.2s; cursor: pointer; border: none; padding: 0;
}
.slides-dot.active { background: var(--accent-color); transform: scale(1.25); }
.slides-nav-btn {
  border: none; background: none; cursor: pointer; padding: 0.25rem;
  color: #999; transition: color 0.15s;
}
.slides-nav-btn:hover { color: var(--text-primary); }
.slides-nav-btn:disabled { opacity: 0.25; cursor: default; }
.slides-nav-btn svg { width: 18px; height: 18px; }
.slides-counter { font-size: 0.7rem; color: var(--text-quaternary); font-variant-numeric: tabular-nums; }

/* ---- ViewCube ---- */
.viewcube-container {
  position: absolute; bottom: 0px; right: 0px;
  width: 120px; height: 120px; z-index: 50;
  pointer-events: auto;
}
.viewcube-container canvas {
  width: 120px; height: 120px; cursor: pointer;
  border-radius: 8px;
}

/* ---- Viewport toolbar ---- */
.viewport-toolbar {
  position: absolute; top: 10px; left: 20px;
  display: flex; flex-direction: column; flex-wrap: wrap; align-content: flex-start;
  gap: 4px; z-index: 50;
  /* Auto 2-column wrap when buttons don't fit vertically */
  max-height: calc(100vh - 100px);
}
.viewport-toolbar button {
  position: relative;
  width: 36px; height: 36px; border: none; border-radius: 8px;
  background: var(--bg-toolbar); color: var(--text-secondary);
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(6px); transition: background 0.15s, color 0.15s;
  padding: 0;
}
.viewport-toolbar button:hover { background: var(--bg-surface); color: var(--text-primary); }
.viewport-toolbar button.active { background: var(--accent-color); color: var(--btn-primary-text); }
.viewport-toolbar button:disabled { opacity: 0.35; cursor: not-allowed; }
.viewport-toolbar button:disabled:hover { background: var(--bg-toolbar); color: var(--text-secondary); }
.viewport-toolbar button svg { width: 18px; height: 18px; }
/* Toolbar button label on hover */
.viewport-toolbar button::after {
  content: attr(data-label);
  position: absolute; left: calc(100% + 8px); top: 50%; transform: translateY(-50%);
  background: rgba(26,26,26,0.88); color: #fff;
  padding: 4px 8px; border-radius: 4px;
  font-size: 0.7rem; font-weight: 500; white-space: nowrap;
  opacity: 0; pointer-events: none;
  transition: opacity 0.15s;
}
.viewport-toolbar button:hover::after { opacity: 1; }
.viewport-toolbar button:disabled:hover::after { opacity: 0; }

/* ---- Measure mode ---- */
.measure-toggle {
  display: inline-flex; align-items: center; gap: 0.4rem;
  width: 100%; justify-content: center;
  padding: 0.5rem 1rem; margin-top: 0.4rem;
  background: var(--bg-surface); color: var(--text-primary); border: 1px solid var(--border-primary);
  border-radius: 8px; font-size: 0.82rem; font-weight: 500;
  cursor: pointer; font-family: inherit;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.measure-toggle:hover { background: var(--bg-surface-hover); border-color: var(--border-primary); }
.measure-toggle:disabled { opacity: 0.4; cursor: not-allowed; }
.measure-toggle.active {
  background: var(--accent-color); color: var(--btn-primary-text); border-color: var(--accent-color);
}
.measure-toggle.active:hover { background: var(--btn-primary-hover); }
.measure-toggle svg { width: 14px; height: 14px; }
.viewport.measure-cursor, .viewport.distance-cursor { cursor: crosshair; }

/* Measurement marker label (2D overlay) */
.measure-label {
  position: absolute; pointer-events: none; z-index: 25;
  background: rgba(26,26,26,0.92); color: #fff;
  padding: 0.3rem 0.55rem; border-radius: 6px;
  font-size: 0.75rem; font-weight: 600; font-family: inherit;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
  transform: translate(-50%, -100%) translateY(-10px);
  opacity: 0; transition: opacity 0.15s;
}
.measure-label.visible { opacity: 1; }
.measure-label::after {
  content: ''; position: absolute; left: 50%; bottom: -5px;
  transform: translateX(-50%);
  border-left: 5px solid transparent; border-right: 5px solid transparent;
  border-top: 5px solid rgba(26,26,26,0.92);
}

/* Bounding box dimension labels — fixed screen-space size */
.bbox-label {
  position: absolute; pointer-events: none; z-index: 24;
  background: rgba(11,174,232,0.88); color: #fff;
  padding: 0.25rem 0.5rem; border-radius: 6px;
  font-size: 0.75rem; font-weight: 600; font-family: inherit;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
  transform: translate(-50%, -50%);
}

/* Clear measurements button — same shape as measure-toggle, grey palette */
.measure-clear {
  display: none; align-items: center; gap: 0.4rem;
  width: 100%; justify-content: center;
  padding: 0.5rem 1rem; margin-top: 0.3rem;
  background: var(--bg-surface); color: var(--text-tertiary); border: 1px solid var(--border-primary);
  border-radius: 8px; font-size: 0.82rem; font-weight: 500;
  cursor: pointer; font-family: inherit;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.measure-clear svg { width: 14px; height: 14px; }
.measure-clear:hover { background: var(--bg-surface-hover); color: var(--text-secondary); border-color: var(--border-primary); }

/* ---- Desktop: hide sidebar toggle and sidebar header (banner handles it) ---- */
@media (min-width: 1025px) {
  .sidebar-toggle { display: none; }
  .sidebar-header { display: none; }
}

/* ---- Responsive (breakpoint 1024px) ---- */
@media (max-width: 1024px) {
  .sidebar-toggle { display: flex; }
  .sidebar-header-top { display: none; }
  .sidebar-header .upload-btn { display: none; }
  .sidebar {
    position: fixed; top: 0; right: 0; bottom: 0;
    margin: 0; border-radius: 0;
    transform: translateX(100%); opacity: 0;
    box-shadow: -4px 0 24px var(--shadow-md);
  }
  .sidebar.open { transform: translateX(0); opacity: 1; }
  .sidebar-backdrop.open { display: block; }
}

/* ---- Theme controls ---- */
.theme-controls {
  position: relative; display: flex; align-items: center; flex-shrink: 0;
}
.theme-toggle {
  width: 36px; height: 36px; border: 1px solid var(--border-primary);
  border-radius: 8px; background: var(--bg-surface); cursor: pointer;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  transition: background 0.2s, border-color 0.2s;
}
.theme-toggle svg { width: 18px; height: 18px; color: var(--text-secondary); }
.theme-toggle:hover { background: var(--bg-surface-hover); }
.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }
.theme-toggle[data-theme-value="light"] .icon-sun { display: block; }
.theme-toggle[data-theme-value="light"] .icon-moon { display: none; }
.theme-toggle[data-theme-value="dark"] .icon-sun { display: none; }
.theme-toggle[data-theme-value="dark"] .icon-moon { display: block; }
.theme-dropdown {
  display: none; position: absolute; top: calc(100% + 4px); right: 0;
  min-width: 170px; padding: 4px 0; z-index: 1000;
  background: var(--bg-surface); border: 1px solid var(--border-primary);
  border-radius: 8px; box-shadow: 0 4px 12px var(--shadow-md);
}
.theme-dropdown.open { display: block; }
.theme-option {
  width: 100%; border: 0; background: transparent; cursor: pointer;
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 14px; font-size: 14px; font-family: 'Inter', sans-serif;
  color: var(--text-primary); text-align: left;
}
.theme-option:hover { background: var(--bg-surface-hover); }
.theme-option.active {
  color: var(--accent-color); font-weight: 600;
}
.theme-option-check {
  opacity: 0; color: var(--accent-color); margin-left: 10px; font-weight: 700;
}
.theme-option.active .theme-option-check { opacity: 1; }
[dir="rtl"] .theme-option { text-align: right; }
[dir="rtl"] .theme-dropdown { right: auto; left: 0; }
[dir="rtl"] .theme-option-check { margin-left: 0; margin-right: 10px; }
[dir="rtl"] .theme-option {
  flex-direction: row-reverse;
}

/* ---- Smooth theme transition ---- */
body, .app-header, .sidebar, .panel, .viewport,
.viewport-toolbar button, .upload-btn, .btn-secondary,
.measure-toggle, .measure-clear, .slides-popup,
.setting-input input[type="number"], .setting-select, .unit-toggle, .unit-btn,
.help-icon, .theme-toggle, .theme-dropdown, .theme-option, .lang-btn {
  transition-property: background-color, color, border-color, box-shadow;
  transition-duration: 0.2s;
  transition-timing-function: ease;
}

/* ---- Dark mode badge adjustments ---- */
[data-theme="dark"] .analysis-mode-badge.mode-local {
  background: #1b3a1b; color: #66bb6a; border-color: #2e7d32;
}
[data-theme="dark"] .analysis-mode-badge.mode-cloud {
  background: #1a2a3d; color: #64b5f6; border-color: #1565c0;
}
[data-theme="dark"] .analysis-mode-badge.mode-gpu {
  background: #3e2723; color: #ffb74d; border-color: #e65100;
}
[data-theme="dark"] .slides-popup-close {
  background: rgba(255,255,255,0.1); color: #bbb;
}
[data-theme="dark"] .slides-popup-close:hover {
  background: rgba(255,255,255,0.2);
}

/* ---- Language Picker ---- */
.lang-picker { position: relative; }
.lang-btn {
  height: 36px; border: 1px solid var(--border-primary);
  border-radius: 8px; background: var(--bg-surface); cursor: pointer;
  padding: 0 10px; font-size: 13px; font-weight: 600; font-family: 'Inter', sans-serif;
  color: var(--text-secondary); display: flex; align-items: center; gap: 4px;
  transition: background 0.2s, border-color 0.2s; flex-shrink: 0;
}
.lang-btn:hover { background: var(--bg-surface-hover); }
.lang-btn svg { color: var(--text-tertiary); flex-shrink: 0; }
.lang-dropdown {
  display: none; position: absolute; top: calc(100% + 4px); right: 0;
  background: var(--bg-surface); border: 1px solid var(--border-primary);
  border-radius: 8px; box-shadow: 0 4px 12px var(--shadow-md);
  z-index: 1000; min-width: 160px; max-height: 320px;
  overflow-y: auto; padding: 4px 0;
}
.lang-dropdown.open { display: block; }
.lang-option {
  padding: 8px 16px; cursor: pointer; font-size: 14px;
  font-family: 'Inter', sans-serif; white-space: nowrap;
  color: var(--text-primary);
}
.lang-option:hover { background: var(--bg-surface-hover); }
.lang-option.active { font-weight: 600; color: var(--accent-color); }

/* ---- Distance measurement label (interactive, deletable) ---- */
.distance-label {
  position: absolute; z-index: 26;
  background: rgba(30,136,229,0.92); color: #fff;
  padding: 0.28rem 0.5rem 0.28rem 0.55rem; border-radius: 6px;
  font-size: 0.75rem; font-weight: 600; font-family: inherit;
  font-variant-numeric: tabular-nums; white-space: nowrap;
  box-shadow: 0 2px 8px rgba(0,0,0,0.25);
  transform: translate(-50%, -100%) translateY(-10px);
  opacity: 0; transition: opacity 0.15s;
  display: flex; align-items: center; gap: 0.35rem;
  pointer-events: auto; cursor: default;
}
.distance-label.visible { opacity: 1; }
.distance-label::after {
  content: ''; position: absolute; left: 50%; bottom: -5px;
  transform: translateX(-50%);
  border-left: 5px solid transparent; border-right: 5px solid transparent;
  border-top: 5px solid rgba(30,136,229,0.92);
}
.distance-label-close {
  border: none; background: rgba(255,255,255,0.25); cursor: pointer;
  border-radius: 3px; padding: 0 3px; font-size: 0.7rem; line-height: 1.3;
  color: #fff; font-family: inherit; transition: background 0.12s;
}
.distance-label-close:hover { background: rgba(255,255,255,0.45); }

/* ---- Rotate panel (floating, anchored to toolbar) ---- */
.rotate-panel {
  position: absolute; top: 10px; left: 56px;
  width: 220px; background: var(--bg-surface);
  border: 1px solid var(--border-primary); border-radius: 8px;
  box-shadow: 0 4px 20px var(--shadow-md); z-index: 60;
  overflow: hidden; animation: popIn 0.18s cubic-bezier(0.4,0,0.2,1);
}
.rotate-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.65rem 0.85rem 0.5rem;
  font-size: 0.78rem; font-weight: 600; color: var(--text-heading);
  text-transform: uppercase; letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-secondary);
}
.rotate-panel-close {
  border: none; background: none; cursor: pointer;
  font-size: 1.1rem; color: var(--text-tertiary); line-height: 1; padding: 0 2px;
  transition: color 0.15s;
}
.rotate-panel-close:hover { color: var(--text-primary); }
.rotate-panel-body { padding: 0.75rem 0.85rem; }
.rotate-hint {
  font-size: 0.72rem; color: var(--text-tertiary); line-height: 1.5;
  margin: 0 0 0.5rem;
}

/* ---- Scale panel (floating, anchored to toolbar) ---- */
.scale-panel {
  position: absolute; top: 10px; left: 56px;
  width: 240px; background: var(--bg-surface);
  border: 1px solid var(--border-primary); border-radius: 8px;
  box-shadow: 0 4px 20px var(--shadow-md); z-index: 60;
  overflow: hidden; animation: popIn 0.18s cubic-bezier(0.4,0,0.2,1);
}
.scale-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.65rem 0.85rem 0.5rem;
  font-size: 0.78rem; font-weight: 600; color: var(--text-heading);
  text-transform: uppercase; letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border-secondary);
}
.scale-panel-body { padding: 0.75rem 0.85rem; }

/* ---- Mesh Quality Panel ---- */
.mesh-quality-badge {
  display: inline-flex; align-items: center; padding: 2px 8px;
  border-radius: 8px; font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.02em; margin-left: 0; cursor: pointer;
}
.mesh-quality-badge.mq-ok  { background: #e8f5e9; color: #2e7d32; border: 1px solid #a5d6a7; margin-left: 4px; }
.mesh-quality-badge.mq-err { background: #fff3e0; color: #e65100; border: 1px solid #ffcc80; margin-left: 4px; }
[data-theme="dark"] .mesh-quality-badge.mq-ok  { background: #1b5e20; color: #a5d6a7; border-color: #2e7d32; }
[data-theme="dark"] .mesh-quality-badge.mq-err { background: #3e2723; color: #ffb74d; border-color: #e65100; }

.mq-error-row {
  display: flex; align-items: center; gap: 0.45rem;
  padding: 0.28rem 0; font-size: 0.82rem; border-bottom: 1px solid var(--border-secondary);
}
.mq-error-row.clickable { cursor: pointer; }
.mq-error-row.clickable:hover { background: var(--bg-surface-hover); border-radius: 4px; }
.mq-error-row.active { background: rgba(255,160,0,0.12); border-radius: 4px; }
.mq-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 16px; height: 16px; border-radius: 50%;
  font-size: 0.65rem; font-weight: 700; flex-shrink: 0;
}
.mq-icon.mq-warn { background: #ff8f00; color: #fff; }
.mq-icon.mq-info { background: #1e88e5; color: #fff; }
.mq-icon.mq-ok   { background: #43a047; color: #fff; }
.mq-label { flex: 1; color: var(--text-primary); }
.mq-count {
  font-weight: 600; font-size: 0.78rem; color: var(--text-secondary);
  min-width: 24px; text-align: right;
}
.mq-toolbar-badge {
  position: absolute; top: 2px; right: 2px;
  width: 8px; height: 8px; border-radius: 50%;
  background: #ff8f00;
}
#toggleMeshQuality { position: relative; }

.mq-advanced-repair-wrap {
  position: relative;
  margin-top: 0.4rem;
}
.mq-advanced-repair-wrap #mqAdvancedRepairBtn {
  margin-top: 0;
}
.advanced-repair-mode-dropdown {
  display: none;
  position: absolute;
  left: 0;
  right: 0;
  bottom: calc(100% + 8px);
  z-index: 80;
  padding: 0.65rem;
  background: var(--bg-surface);
  border: 1px solid var(--border-primary);
  border-radius: 10px;
  box-shadow: 0 4px 12px var(--shadow-md);
}
.advanced-repair-mode-dropdown.open {
  display: block;
}
.advanced-repair-mode-title {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--text-heading);
}
.advanced-repair-mode-copy {
  margin-top: 0.3rem;
  font-size: 0.72rem;
  line-height: 1.45;
  color: var(--text-secondary);
}
.advanced-repair-mode-action {
  width: 100%;
  margin-top: 0.5rem;
  justify-content: center;
  font-size: 0.76rem;
}

/* ---- RTL Support (Arabic) ---- */
[dir="rtl"] .sidebar { left: auto; right: 0; }
[dir="rtl"] .header-actions { flex-direction: row-reverse; }
[dir="rtl"] .header-left { flex-direction: row-reverse; }
[dir="rtl"] .stat { flex-direction: row-reverse; }
[dir="rtl"] .setting-row { flex-direction: row-reverse; }
[dir="rtl"] .lang-dropdown { right: auto; left: 0; }
[dir="rtl"] .viewport-toolbar { flex-direction: row-reverse; }
[dir="rtl"] input[type="number"] { text-align: left; }
[dir="rtl"] .checkbox-row { flex-direction: row-reverse; }
@media (max-width: 768px) {
  [dir="rtl"] .sidebar { transform: translateX(-100%); }
  [dir="rtl"] .sidebar.open { transform: translateX(0); }
  .app-header h1 { display: none; }
  #emptyState { padding-left: 72px; padding-right: 1rem; }
}