/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #F1F5F9;
  --surface: #FFFFFF;
  --surface-2: #F8FAFC;
  --border: #E2E8F0;
  --border-hover: #CBD5E1;
  --primary: #2563EB;
  --primary-light: #EFF6FF;
  --primary-dark: #1D4ED8;
  --text-primary: #0F172A;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;
  --green: #16A34A;
  --green-bg: #F0FDF4;
  --amber: #D97706;
  --amber-bg: #FFFBEB;
  --red: #DC2626;
  --red-bg: #FEF2F2;
  --sidebar-w: 240px;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
}

html, body {
  height: 100%;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  font-size: 14px;
  color: var(--text-primary);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

/* ===== Layout ===== */
body { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-w);
  min-height: 100vh;
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 0;
  flex-shrink: 0;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 100;
}

.main {
  flex: 1;
  margin-left: var(--sidebar-w);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* ===== Sidebar Logo ===== */
.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--border);
}
.logo-icon {
  width: 36px; height: 36px;
  background: var(--primary-light);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.logo-text {
  font-size: 15px; font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

/* ===== Sidebar Nav ===== */
.sidebar-nav {
  padding: 12px 10px 8px;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 13.5px;
  transition: all 0.15s;
}
.nav-item:hover {
  background: var(--bg);
  color: var(--text-primary);
}
.nav-item.active {
  background: var(--primary-light);
  color: var(--primary);
}

/* ===== Sidebar Sections ===== */
.sidebar-section {
  padding: 16px 16px 12px;
  border-top: 1px solid var(--border);
}
.section-label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  margin-bottom: 10px;
}

/* VLM setting extras */
.setting-tag {
  display: inline-block;
  font-size: 9.5px; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.04em;
  padding: 1px 6px; margin-left: 6px;
  border-radius: 6px;
  background: var(--border); color: var(--text-muted);
  vertical-align: middle;
}
.setting-hint {
  font-size: 11px; line-height: 1.45;
  color: var(--text-muted); margin-top: 8px;
}

/* Toggle */
.toggle-label {
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer;
  font-size: 13.5px; font-weight: 500;
  color: var(--text-secondary);
}
.toggle { position: relative; display: inline-block; width: 36px; height: 20px; }
.toggle input { opacity: 0; width: 0; height: 0; }
.toggle-slider {
  position: absolute; inset: 0;
  background: var(--border);
  border-radius: 20px;
  transition: 0.2s;
  cursor: pointer;
}
.toggle-slider::before {
  content: '';
  position: absolute;
  width: 14px; height: 14px;
  left: 3px; top: 3px;
  background: white;
  border-radius: 50%;
  transition: 0.2s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}
.toggle input:checked + .toggle-slider { background: var(--primary); }
.toggle input:checked + .toggle-slider::before { transform: translateX(16px); }

/* Sliders */
.slider-group { margin-bottom: 14px; }
.slider-row {
  display: flex; justify-content: space-between; align-items: center;
  margin-bottom: 5px;
}
.slider-label { font-size: 12.5px; color: var(--text-secondary); font-weight: 500; }
.slider-val { font-size: 12px; font-weight: 600; color: var(--primary); }
.slider {
  width: 100%; height: 4px;
  -webkit-appearance: none;
  background: var(--border);
  border-radius: 4px;
  outline: none;
  cursor: pointer;
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  background: var(--primary);
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--primary-light);
}
.slider:hover { background: var(--border-hover); }

/* Footer badges */
.sidebar-footer {
  margin-top: auto;
  padding: 14px 16px 20px;
  border-top: 1px solid var(--border);
}
.tech-badges { display: flex; flex-wrap: wrap; gap: 6px; }
.badge {
  font-size: 11px; font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
  padding: 3px 8px;
  border-radius: 20px;
  letter-spacing: 0.3px;
}

/* ===== Topbar ===== */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px 28px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.topbar-left { display: flex; flex-direction: column; gap: 2px; }
.page-title { font-size: 20px; font-weight: 700; letter-spacing: -0.4px; }
.page-subtitle { font-size: 12.5px; color: var(--text-muted); }
.topbar-right { display: flex; align-items: center; gap: 8px; }
.status-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: #94A3B8;
  transition: background 0.3s;
}
.status-dot.ready { background: var(--green); }
.status-dot.running { background: var(--amber); animation: pulse 1s infinite; }
.status-dot.error { background: var(--red); }
.status-text { font-size: 12.5px; font-weight: 500; color: var(--text-secondary); }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

/* ===== Upload Section ===== */
.upload-section {
  padding: 24px 28px 20px;
}

.upload-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.upload-card {
  background: var(--surface);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  min-height: 200px;
  position: relative;
  cursor: pointer;
  transition: border-color 0.2s, box-shadow 0.2s;
  overflow: hidden;
}
.upload-card:hover, .upload-card.drag-over {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
.upload-card.has-file {
  border-style: solid;
  border-color: var(--border);
  cursor: default;
}

.upload-inner {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  height: 200px; gap: 10px;
  padding: 20px;
}
.upload-icon { color: var(--text-muted); }
.upload-label { font-size: 14px; font-weight: 600; color: var(--text-secondary); }
.upload-hint { font-size: 12.5px; color: var(--text-muted); }
.file-input {
  position: absolute; inset: 0;
  opacity: 0; cursor: pointer;
  width: 100%; height: 100%;
}

.upload-preview {
  height: 200px;
  display: flex; align-items: center; justify-content: center;
  position: relative;
}
.upload-preview img {
  max-width: 100%; max-height: 180px;
  object-fit: contain;
  border-radius: 8px;
}
.clear-btn {
  position: absolute; top: 10px; right: 10px;
  width: 26px; height: 26px;
  background: rgba(0,0,0,0.5);
  color: white;
  border: none; border-radius: 50%;
  cursor: pointer; font-size: 16px; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s;
}
.clear-btn:hover { background: rgba(0,0,0,0.75); }

/* Run button row */
.run-row {
  display: flex; justify-content: center;
  margin-top: 18px;
}

.run-btn {
  display: flex; align-items: center; gap: 8px;
  padding: 11px 28px;
  background: var(--primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
  box-shadow: 0 2px 8px rgba(37,99,235,0.35);
  letter-spacing: 0.2px;
}
.run-btn:hover:not(:disabled) {
  background: var(--primary-dark);
  box-shadow: 0 4px 12px rgba(37,99,235,0.45);
  transform: translateY(-1px);
}
.run-btn:active:not(:disabled) { transform: translateY(0); }
.run-btn:disabled {
  background: #CBD5E1;
  box-shadow: none;
  cursor: not-allowed;
}

/* ===== Stats Row ===== */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  padding: 0 28px 20px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
}
.stat-value {
  font-size: 26px; font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.5px;
  line-height: 1;
  margin-bottom: 5px;
}
.stat-label {
  font-size: 12px; font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
}

/* ===== Results Section ===== */
.results-section { padding: 0 28px 32px; }

.results-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 16px;
}

.result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}
.card-title {
  font-size: 13.5px; font-weight: 600;
  color: var(--text-primary);
}
.card-count {
  font-size: 12px; font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 20px;
}

.download-btn {
  display: flex; align-items: center; gap: 5px;
  padding: 5px 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 12px; font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
}
.download-btn:hover {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
}

/* Visualization */
.viz-container {
  padding: 16px;
  display: flex; justify-content: center;
  background: var(--surface-2);
}
.viz-container img {
  max-width: 100%;
  border-radius: 8px;
  box-shadow: var(--shadow-md);
}

/* Detection cards list */
.detections-list {
  padding: 10px;
  display: flex; flex-direction: column; gap: 8px;
  max-height: 600px;
  overflow-y: auto;
}
.detections-list::-webkit-scrollbar { width: 4px; }
.detections-list::-webkit-scrollbar-track { background: transparent; }
.detections-list::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.detection-item {
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  border: 1px solid var(--border);
  transition: box-shadow 0.15s;
  cursor: default;
}
.detection-item:hover { box-shadow: var(--shadow-md); }

.detection-item.high { background: var(--green-bg); border-color: #BBF7D0; }
.detection-item.mid  { background: #EFF6FF; border-color: #BFDBFE; }
.detection-item.low  { background: var(--red-bg); border-color: #FECACA; }

.detection-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 8px;
}
.detection-num {
  font-size: 12px; font-weight: 700;
  display: flex; align-items: center; gap: 6px;
}
.detection-num .num-badge {
  width: 22px; height: 22px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; color: white;
}
.detection-item.high .num-badge { background: var(--green); }
.detection-item.mid  .num-badge { background: var(--primary); }
.detection-item.low  .num-badge { background: var(--red); }

.detection-conf {
  font-size: 13px; font-weight: 700;
}
.detection-item.high .detection-conf { color: var(--green); }
.detection-item.mid  .detection-conf { color: var(--primary); }
.detection-item.low  .detection-conf { color: var(--red); }

.detection-meta {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 4px;
}
.meta-row {
  font-size: 11.5px; color: var(--text-secondary);
  display: flex; align-items: center; gap: 4px;
}
.meta-row span { color: var(--text-muted); }

.conf-bar-wrap {
  margin-top: 8px;
  height: 3px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}
.conf-bar {
  height: 100%; border-radius: 3px;
  transition: width 0.4s ease;
}
.detection-item.high .conf-bar { background: var(--green); }
.detection-item.mid  .conf-bar { background: var(--primary); }
.detection-item.low  .conf-bar { background: var(--red); }

/* Empty state */
.empty-state {
  display: flex; flex-direction: column; align-items: center;
  justify-content: center; gap: 8px;
  padding: 40px 20px;
  color: var(--text-muted);
  text-align: center;
}
.empty-state svg { opacity: 0.4; }
.empty-state p { font-size: 13px; }

/* ===== Loading Overlay ===== */
.loading-overlay {
  position: fixed; inset: 0;
  background: rgba(15,23,42,0.55);
  display: flex; align-items: center; justify-content: center;
  z-index: 200;
  backdrop-filter: blur(3px);
}
.loading-card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 36px 48px;
  text-align: center;
  box-shadow: 0 20px 40px rgba(0,0,0,0.2);
  display: flex; flex-direction: column; align-items: center; gap: 12px;
}
.spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.loading-title { font-size: 16px; font-weight: 700; }
.loading-sub { font-size: 13px; color: var(--text-muted); }

/* ===== Error toast ===== */
.toast {
  position: fixed; bottom: 24px; right: 24px;
  background: #1E293B;
  color: white;
  padding: 14px 20px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.25);
  z-index: 300;
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.25s, transform 0.25s;
  max-width: 360px;
}
.toast.show { opacity: 1; transform: translateY(0); }
.toast.error { border-left: 3px solid var(--red); }
.toast.success { border-left: 3px solid var(--green); }

/* ===== ABOUT PAGE ===== */
.about-page {
  padding: 40px 56px;
  max-width: 1200px;
  margin: 0 auto;
  animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

.about-hero {
  text-align: center;
  margin-bottom: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.about-hero-icon {
  width: 60px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: 12px;
  margin: 0 auto 16px;
  color: var(--primary);
}

.about-title {
  font-size: 2.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.about-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.about-badges {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
}

.about-badge {
  display: inline-block;
  padding: 6px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 40px;
}

.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: all 0.2s;
}

.about-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.about-card-wide {
  grid-column: 1 / -1;
}

.about-card-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.about-card-title svg {
  color: var(--primary);
}

/* Pipeline steps */
.pipeline-steps {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 8px 0;
  align-items: center;
  flex-wrap: wrap;
}

.pipe-step {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  min-width: fit-content;
  flex-shrink: 0;
}

.pipe-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  color: white;
  flex-shrink: 0;
}

.pipe-body {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.pipe-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
}

.pipe-desc {
  font-size: 11px;
  color: var(--text-secondary);
}

.pipe-time {
  font-size: 10px;
  color: var(--amber);
  font-weight: 500;
  white-space: nowrap;
}

.pipe-arrow {
  color: var(--text-muted);
  font-size: 18px;
  flex-shrink: 0;
}

/* Lists */
.about-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.about-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  font-size: 13.5px;
  color: var(--text-primary);
  line-height: 1.5;
}

.about-list svg {
  flex-shrink: 0;
  margin-top: 2px;
}

/* Tech table */
.tech-table {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tech-row {
  display: grid;
  grid-template-columns: 90px 1fr;
  gap: 12px;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 13px;
}

.tech-row:last-child {
  border-bottom: none;
}

.tech-layer {
  font-weight: 500;
  color: var(--primary);
  font-size: 12px;
  text-transform: uppercase;
}

.tech-val {
  color: var(--text-primary);
}

.tech-val code {
  background: var(--surface-2);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 11px;
  font-family: 'Monaco', 'Courier New', monospace;
  color: var(--primary);
}

/* Spec card */
.about-spec-card {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--primary-light) 0%, #F0FDF4 100%);
  border-color: var(--primary);
}

.about-spec-desc {
  font-size: 13.5px;
  color: var(--text-primary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.about-spec-meta {
  display: block;
  font-size: 12px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.spec-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  background: var(--primary);
  color: white;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s;
  border: none;
  cursor: pointer;
}

.spec-link-btn:hover {
  background: var(--primary-dark);
  transform: translateX(2px);
}

.spec-link-btn svg {
  width: 14px;
  height: 14px;
}

/* Footer */
.about-footer {
  text-align: center;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-secondary);
}

.about-footer a {
  color: var(--primary);
  text-decoration: none;
}

.about-footer a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .about-grid { grid-template-columns: 1fr; }
  .about-card-wide { grid-column: 1; }
  .about-page { padding: 24px 16px; }
  .about-title { font-size: 1.6rem; }
  .pipeline-steps { flex-direction: column; }
}