/* ============================================================
   ItemVision AI — Design System
   Dark tech theme · Mobile-first · Responsive
   ============================================================ */

:root {
  --color-primary: #00d4ff;
  --color-primary-hover: #00b8e6;
  --color-primary-glow: rgba(0, 212, 255, 0.3);
  --color-secondary: #7c3aed;
  --color-secondary-hover: #6d28d9;
  --color-bg: #0a0a1a;
  --color-surface: #12122a;
  --color-surface-2: #1a1a3e;
  --color-border: #2a2a4a;
  --color-border-light: #3a3a5a;
  --color-text: #e2e8f0;
  --color-text-secondary: #94a3b8;
  --color-text-muted: #64748b;
  --color-success: #00ff88;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  --color-detection-object: #00d4ff;
  --color-detection-face: #00ff88;
  --color-detection-motion: #ffcc00;
  --color-detection-tracked: #ef4444;
  --space-1: 0.25rem; --space-2: 0.5rem; --space-3: 0.75rem; --space-4: 1rem;
  --space-5: 1.25rem; --space-6: 1.5rem; --space-8: 2rem; --space-10: 2.5rem;
  --space-12: 3rem; --space-16: 4rem;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'Consolas', monospace;
  --text-xs: 0.75rem; --text-sm: 0.8125rem; --text-base: 0.9375rem;
  --text-lg: 1.125rem; --text-xl: 1.375rem; --text-2xl: 1.75rem;
  --radius-sm: 6px; --radius-md: 10px; --radius-lg: 16px; --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px var(--color-primary-glow);
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --header-height: 56px;
  --controls-height: 52px;
  --footer-height: 48px;
  --panel-width: 320px;
}

[data-theme="light"] {
  --color-bg: #f0f2f5;
  --color-surface: #ffffff;
  --color-surface-2: #f8fafc;
  --color-border: #e2e8f0;
  --color-border-light: #cbd5e1;
  --color-text: #0f172a;
  --color-text-secondary: #475569;
  --color-text-muted: #94a3b8;
}

*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }
html { font-size:16px; -webkit-text-size-adjust:100%; }
body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

#app { display:flex; flex-direction:column; min-height:100dvh; max-width:100vw; }

/* Header */
#header {
  display:flex; align-items:center; justify-content:space-between;
  height:var(--header-height); padding:0 var(--space-4);
  background:var(--color-surface); border-bottom:1px solid var(--color-border);
  position:sticky; top:0; z-index:100;
  -webkit-backdrop-filter:blur(12px); backdrop-filter:blur(12px);
}
.logo { display:flex; align-items:center; gap:var(--space-2); }
.logo-icon { color:var(--color-primary); filter:drop-shadow(0 0 6px var(--color-primary-glow)); }
.logo-text { font-size:var(--text-lg); font-weight:700; letter-spacing:-0.02em; }
.logo-accent { color:var(--color-primary); }
.header-center { display:none; }
@media (min-width:768px) { .header-center { display:flex; align-items:center; } }
.status-badge {
  display:inline-flex; align-items:center; gap:var(--space-1);
  padding:2px 10px; border-radius:var(--radius-full);
  font-size:var(--text-xs); font-weight:600; text-transform:uppercase; letter-spacing:0.05em;
}
.status-offline { background:rgba(239,68,68,0.15); color:var(--color-error); }
.status-loading { background:rgba(245,158,11,0.15); color:var(--color-warning); animation:pulse-badge 1.5s infinite; }
.status-online { background:rgba(0,255,136,0.15); color:var(--color-success); }
@keyframes pulse-badge { 0%,100%{opacity:1} 50%{opacity:0.6} }
.header-right { display:flex; align-items:center; gap:var(--space-2); }

/* Controls */
#controls {
  display:flex; align-items:center; gap:var(--space-2);
  padding:var(--space-2) var(--space-3);
  background:var(--color-surface); border-bottom:1px solid var(--color-border);
  min-height:var(--controls-height); overflow-x:auto;
  -webkit-overflow-scrolling:touch; position:sticky; top:var(--header-height); z-index:99;
}
#controls::-webkit-scrollbar { display:none; }
.controls-group { display:flex; align-items:center; gap:var(--space-2); flex-shrink:0; }
.controls-group+.controls-group { margin-left:auto; }

/* Buttons */
.btn {
  display:inline-flex; align-items:center; gap:var(--space-1);
  padding:7px 14px; border:none; border-radius:var(--radius-md);
  font-size:var(--text-sm); font-weight:600; cursor:pointer;
  transition:all var(--transition-fast); white-space:nowrap;
  min-height:36px; font-family:var(--font-sans);
}
.btn:disabled { opacity:0.4; cursor:not-allowed; }
.btn:active:not(:disabled) { transform:scale(0.97); }
.btn-primary {
  background:var(--color-primary); color:#000;
  box-shadow:0 0 12px var(--color-primary-glow);
}
.btn-primary:hover:not(:disabled) { background:var(--color-primary-hover); box-shadow:0 0 20px var(--color-primary-glow); }
.btn-secondary { background:var(--color-surface-2); color:var(--color-text); border:1px solid var(--color-border); }
.btn-secondary:hover:not(:disabled) { background:var(--color-border); border-color:var(--color-border-light); }
.btn-ghost { background:transparent; color:var(--color-text-secondary); padding:4px 10px; }
.btn-ghost:hover { color:var(--color-text); background:var(--color-surface-2); }
.btn-sm { padding:4px 10px; font-size:var(--text-xs); min-height:28px; }
.btn-icon {
  display:inline-flex; align-items:center; justify-content:center;
  width:36px; height:36px; padding:0; border:none; border-radius:var(--radius-md);
  background:transparent; color:var(--color-text-secondary); cursor:pointer;
  transition:all var(--transition-fast); min-width:36px;
}
.btn-icon:hover { background:var(--color-surface-2); color:var(--color-text); }
.btn-icon-svg { flex-shrink:0; }

/* Toggle */
.toggle-group { display:inline-flex; background:var(--color-surface-2); border-radius:var(--radius-md); padding:2px; gap:1px; }
.toggle-btn {
  display:inline-flex; align-items:center; justify-content:center;
  padding:5px 12px; border:none; border-radius:calc(var(--radius-md)-2px);
  background:transparent; color:var(--color-text-muted);
  font-size:var(--text-xs); font-weight:600; cursor:pointer;
  transition:all var(--transition-fast); white-space:nowrap;
  min-height:30px; font-family:var(--font-sans);
}
.toggle-btn.active { background:var(--color-primary); color:#000; box-shadow:0 0 10px var(--color-primary-glow); }
.toggle-btn:not(.active):hover { color:var(--color-text); }

.select-input {
  display:inline-flex; align-items:center;
  padding:5px 30px 5px 10px; border:1px solid var(--color-border);
  border-radius:var(--radius-md); background:var(--color-surface-2);
  color:var(--color-text); font-size:var(--text-sm); font-family:var(--font-sans);
  cursor:pointer; min-height:36px;
  -webkit-appearance:none; appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat:no-repeat; background-position:right 10px center;
}
.select-input:disabled { opacity:0.4; cursor:not-allowed; }
.select-input:focus { outline:none; border-color:var(--color-primary); }

/* Main */
#mainContent { display:flex; flex-direction:column; flex:1; gap:0; overflow:hidden; }
@media (min-width:1024px) { #mainContent { flex-direction:row; } }

/* Camera */
#cameraSection { flex:1; position:relative; min-height:300px; background:#000; }
#cameraContainer { position:relative; width:100%; height:100%; min-height:300px; overflow:hidden; background:#000; }
#video { width:100%; height:100%; object-fit:contain; display:block; position:relative; z-index:1; }
#overlay {
  position:absolute; top:0; left:0; width:100%; height:100%;
  pointer-events:none; z-index:5;
}

/* Crosshair */
.crosshair {
  position:absolute; top:50%; left:50%;
  transform:translate(-50%,-50%); pointer-events:none; z-index:10;
}
.crosshair.hidden { display:none; }
.crosshair-ring {
  position:absolute; top:50%; left:50%;
  width:80px; height:80px; transform:translate(-50%,-50%);
  border:2px solid var(--color-detection-tracked); border-radius:50%;
  animation:crosshair-pulse 1.5s ease-in-out infinite;
  box-shadow:0 0 15px rgba(239,68,68,0.4);
}
.crosshair-dot {
  position:absolute; top:50%; left:50%;
  width:4px; height:4px; transform:translate(-50%,-50%);
  background:var(--color-detection-tracked); border-radius:50%;
}
.crosshair-line-h,.crosshair-line-v { position:absolute; background:var(--color-detection-tracked); opacity:0.5; }
.crosshair-line-h { top:50%; left:50%; width:40px; height:1px; transform:translate(-50%,-50%); }
.crosshair-line-v { top:50%; left:50%; width:1px; height:40px; transform:translate(-50%,-50%); }
@keyframes crosshair-pulse {
  0%,100%{transform:translate(-50%,-50%) scale(1);opacity:1}
  50%{transform:translate(-50%,-50%) scale(1.1);opacity:0.7}
}

/* Status overlay */
.status-overlay {
  position:absolute; inset:0; display:flex; align-items:center; justify-content:center;
  background:rgba(10,10,26,0.95); z-index:20; transition:opacity var(--transition-slow);
}
.status-overlay.hidden { opacity:0; pointer-events:none; }
.status-content { text-align:center; max-width:320px; padding:var(--space-6); }
.status-spinner { margin-bottom:var(--space-4); display:flex; justify-content:center; }
.spinner-ring {
  width:48px; height:48px; border:3px solid var(--color-border);
  border-top-color:var(--color-primary); border-radius:50%;
  animation:spin 0.8s linear infinite; box-shadow:0 0 20px var(--color-primary-glow);
}
@keyframes spin { to { transform:rotate(360deg); } }
.status-message { font-size:var(--text-lg); font-weight:600; margin-bottom:var(--space-3); color:var(--color-text); }
.status-detail { font-size:var(--text-sm); color:var(--color-text-muted); margin-top:var(--space-2); }
.progress-container { width:100%; height:4px; background:var(--color-border); border-radius:var(--radius-full); overflow:hidden; margin-top:var(--space-3); }
.progress-bar { height:100%; width:0%; background:linear-gradient(90deg,var(--color-primary),var(--color-secondary)); border-radius:var(--radius-full); transition:width .3s; }
.retry-btn { margin-top:var(--space-4); }
.retry-btn.hidden { display:none; }
.status-overlay.error .status-spinner { display:none; }
.status-overlay.error .status-message { color:var(--color-error); }
.status-overlay.error .status-detail { color:var(--color-error); opacity:0.8; }

/* Mode badge */
.mode-badge {
  position:absolute; top:var(--space-3); left:var(--space-3); z-index:10;
  display:inline-flex; align-items:center; gap:var(--space-1);
  padding:4px 12px; background:rgba(0,0,0,0.7); -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px); border:1px solid var(--color-border);
  border-radius:var(--radius-full); font-size:var(--text-xs); font-weight:600;
  pointer-events:none;
}
.mode-badge.hidden { display:none; }

/* FPS */
.fps-counter {
  position:absolute; top:var(--space-3); right:var(--space-3); z-index:10;
  padding:4px 10px; background:rgba(0,0,0,0.7); -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px); border:1px solid var(--color-border);
  border-radius:var(--radius-full); font-family:var(--font-mono);
  font-size:var(--text-xs); color:var(--color-text-secondary); pointer-events:none;
}
.fps-counter.hidden { display:none; }

/* Results panel */
.results-panel {
  width:100%; background:var(--color-surface);
  border-top:1px solid var(--color-border);
  display:flex; flex-direction:column; max-height:300px; overflow:hidden;
}
@media (min-width:1024px) {
  .results-panel { width:var(--panel-width); max-height:none; border-top:none; border-left:1px solid var(--color-border); height:calc(100dvh - var(--header-height) - var(--controls-height)); }
}
.panel-header { display:flex; align-items:center; justify-content:space-between; padding:var(--space-3) var(--space-4); border-bottom:1px solid var(--color-border); flex-shrink:0; }
.panel-title { font-size:var(--text-sm); font-weight:700; text-transform:uppercase; letter-spacing:0.05em; color:var(--color-text-secondary); }
.result-count { display:inline-flex; align-items:center; justify-content:center; min-width:22px; height:22px; padding:0 6px; background:var(--color-primary); color:#000; font-size:var(--text-xs); font-weight:700; border-radius:var(--radius-full); }

.stats-row { display:flex; gap:1px; background:var(--color-border); flex-shrink:0; }
.stat-item { flex:1; display:flex; flex-direction:column; align-items:center; gap:2px; padding:var(--space-2); background:var(--color-surface); text-align:center; }
.stat-label { font-size:var(--text-xs); color:var(--color-text-muted); text-transform:uppercase; letter-spacing:0.04em; font-weight:600; }
.stat-value { font-family:var(--font-mono); font-size:var(--text-xl); font-weight:700; color:var(--color-text); min-height:1.5em; }

.detection-list { flex:1; overflow-y:auto; padding:var(--space-2); }
.detection-list::-webkit-scrollbar { width:4px; }
.detection-list::-webkit-scrollbar-track { background:transparent; }
.detection-list::-webkit-scrollbar-thumb { background:var(--color-border); border-radius:var(--radius-full); }

.empty-state { display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; padding:var(--space-8) var(--space-4); color:var(--color-text-muted); }
.empty-icon { margin-bottom:var(--space-3); opacity:0.5; }
.empty-title { font-size:var(--text-base); font-weight:600; color:var(--color-text-secondary); margin-bottom:var(--space-1); }
.empty-desc { font-size:var(--text-sm); max-width:240px; }

.detection-card { display:flex; align-items:center; gap:var(--space-3); padding:var(--space-2) var(--space-3); border-radius:var(--radius-md); cursor:pointer; transition:all var(--transition-fast); margin-bottom:2px; min-height:44px; }
.detection-card:hover { background:var(--color-surface-2); }
.detection-card.active { background:var(--color-surface-2); border:1px solid var(--color-detection-tracked); }
.detection-card .card-color { width:4px; height:28px; border-radius:2px; flex-shrink:0; }
.detection-card .card-info { flex:1; min-width:0; }
.detection-card .card-label { font-size:var(--text-sm); font-weight:600; white-space:nowrap; overflow:hidden; text-overflow:ellipsis; }
.detection-card .card-sub { font-size:var(--text-xs); color:var(--color-text-muted); }
.detection-card .card-confidence { font-family:var(--font-mono); font-size:var(--text-sm); font-weight:600; flex-shrink:0; }
.detection-card .card-badge { display:inline-flex; align-items:center; padding:1px 6px; border-radius:var(--radius-sm); font-size:10px; font-weight:700; text-transform:uppercase; letter-spacing:0.04em; flex-shrink:0; }
.badge-object { background:rgba(0,212,255,0.15); color:var(--color-detection-object); }
.badge-face { background:rgba(0,255,136,0.15); color:var(--color-detection-face); }

.follow-info { display:flex; align-items:center; justify-content:space-between; padding:var(--space-2) var(--space-4); background:var(--color-surface-2); border-top:1px solid var(--color-border); flex-shrink:0; }
.follow-info.hidden { display:none; }
.follow-indicator { display:flex; align-items:center; gap:var(--space-2); font-size:var(--text-sm); color:var(--color-detection-tracked); }
.follow-pulse { width:8px; height:8px; border-radius:50%; background:var(--color-detection-tracked); animation:pulse-dot 1s ease-in-out infinite; }
@keyframes pulse-dot { 0%,100%{opacity:1;transform:scale(1)} 50%{opacity:0.5;transform:scale(1.3)} }

#footer { display:flex; flex-direction:column; align-items:center; justify-content:center; gap:2px; padding:var(--space-2) var(--space-4); height:var(--footer-height); background:var(--color-surface); border-top:1px solid var(--color-border); text-align:center; flex-shrink:0; }
.footer-text { font-size:var(--text-xs); color:var(--color-text-muted); font-weight:600; }
.footer-hint { font-size:11px; color:var(--color-text-muted); opacity:0.7; }

.toast-container {
  position:fixed; bottom:calc(var(--footer-height) + var(--space-4));
  left:50%; transform:translateX(-50%); z-index:200;
  display:flex; flex-direction:column; align-items:center; gap:var(--space-2); pointer-events:none;
}
@media (min-width:1024px) { .toast-container { bottom:var(--space-6); } }
.toast {
  display:inline-flex; align-items:center; gap:var(--space-2);
  padding:var(--space-2) var(--space-4); background:var(--color-surface);
  border:1px solid var(--color-border); border-radius:var(--radius-md);
  box-shadow:var(--shadow-lg); font-size:var(--text-sm);
  pointer-events:auto; animation:toast-in .3s ease; max-width:360px;
}
.toast.toast-out { animation:toast-out .3s ease forwards; }
.toast-success { border-color:var(--color-success); }
.toast-error { border-color:var(--color-error); }
.toast-info { border-color:var(--color-info); }
@keyframes toast-in { from{opacity:0;transform:translateY(10px)} to{opacity:1;transform:translateY(0)} }
@keyframes toast-out { from{opacity:1;transform:translateY(0)} to{opacity:0;transform:translateY(10px)} }

.modal-overlay { position:fixed; inset:0; z-index:300; display:flex; align-items:center; justify-content:center; background:rgba(0,0,0,0.7); -webkit-backdrop-filter:blur(4px); backdrop-filter:blur(4px); padding:var(--space-4); }
.modal-overlay.hidden { display:none; }
.modal-content { background:var(--color-surface); border:1px solid var(--color-border); border-radius:var(--radius-lg); max-width:480px; width:100%; max-height:80vh; overflow-y:auto; box-shadow:var(--shadow-lg); }
.modal-header { display:flex; align-items:center; justify-content:space-between; padding:var(--space-4) var(--space-5); border-bottom:1px solid var(--color-border); }
.modal-header h2 { font-size:var(--text-lg); font-weight:700; }
.modal-body { padding:var(--space-4) var(--space-5); }
.modal-body h3 { font-size:var(--text-base); font-weight:700; margin-top:var(--space-4); margin-bottom:var(--space-2); color:var(--color-primary); }
.modal-body p { font-size:var(--text-sm); color:var(--color-text-secondary); line-height:1.6; margin-bottom:var(--space-2); }
.modal-body ul { font-size:var(--text-sm); color:var(--color-text-secondary); padding-left:var(--space-5); line-height:1.7; }
.modal-body li { margin-bottom:var(--space-1); }
.modal-body strong { color:var(--color-text); }

/* Responsive */
@media (max-width:374px) {
  .btn-text,.flip-text { display:none; }
  #controls { padding:var(--space-1) var(--space-2); gap:var(--space-1); }
  .controls-group+.controls-group { margin-left:0; }
}
@media (max-width:639px) {
  .controls-group+.controls-group { margin-left:0; }
  #controls { flex-wrap:wrap; gap:var(--space-1); }
  .toggle-btn { padding:5px 10px; font-size:11px; }
  .select-input { max-width:130px; font-size:var(--text-xs); padding:5px 24px 5px 8px; }
}
@media (min-width:640px) and (max-width:1023px) { #cameraSection { min-height:400px; } }
@media (min-width:1024px) {
  #cameraSection { min-height:calc(100dvh - var(--header-height) - var(--controls-height) - var(--footer-height)); }
  #controls { padding:var(--space-2) var(--space-4); }
  .controls-group+.controls-group { margin-left:auto; }
}
@media (min-width:1440px) { :root { --panel-width:360px; } }

:focus-visible { outline:2px solid var(--color-primary); outline-offset:2px; }

@media (prefers-reduced-motion:reduce) {
  *,*::before,*::after { animation-duration:.01ms!important; animation-iteration-count:1!important; transition-duration:.01ms!important; }
}