/* ===== Custom Properties ===== */
:root {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-sidebar: #0f172a;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: rgba(99, 102, 241, 0.15);
  --border: #334155;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --radius: 12px;
  --radius-sm: 8px;
  --sidebar-width: 240px;
  --mobile-header-height: 56px;
  --transition: 200ms ease;
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-sidebar: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --border: #e2e8f0;
  --accent-light: rgba(99, 102, 241, 0.1);
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== Offline Banner ===== */
.offline-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--warning);
  color: #0f172a;
  text-align: center;
  padding: 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  z-index: 1000;
  transform: translateY(0);
  transition: transform var(--transition);
}

.offline-banner.hidden {
  transform: translateY(-100%);
}

/* ===== App Layout ===== */
.app {
  display: flex;
  min-height: 100vh;
}

/* ===== Sidebar ===== */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transition: transform var(--transition);
}

.sidebar-header {
  padding: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--text-primary);
}

.nav-list {
  list-style: none;
  padding: 0.75rem;
  flex: 1;
  overflow-y: auto;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: all var(--transition);
}

.nav-link:hover {
  background: var(--accent-light);
  color: var(--text-primary);
}

.nav-link.active {
  background: var(--accent-light);
  color: var(--accent);
  font-weight: 600;
}

.sidebar-footer {
  padding: 1rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* ===== Theme Toggle ===== */
.theme-toggle {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  padding: 0.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--accent);
}

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

/* ===== Install Button ===== */
.install-btn {
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.625rem 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
}

.install-btn:hover {
  background: var(--accent-hover);
}

/* ===== Mobile Header ===== */
.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--mobile-header-height);
  background: var(--bg-sidebar);
  border-bottom: 1px solid var(--border);
  padding: 0 1rem;
  align-items: center;
  justify-content: space-between;
  z-index: 90;
}

.mobile-title {
  font-weight: 700;
  font-size: 1.125rem;
}

.menu-toggle {
  background: none;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 0.25rem;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 99;
}

.sidebar-overlay.active {
  display: block;
}

/* ===== Main Content ===== */
.content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 2rem;
  max-width: 900px;
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
  animation: fadeIn 200ms ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

h1 {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 0.25rem;
  letter-spacing: -0.02em;
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1.0625rem;
  margin-bottom: 1.5rem;
}

/* ===== Cards ===== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.card h3 {
  font-size: 1.0625rem;
  margin-bottom: 0.5rem;
}

.card p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
  margin-bottom: 0.75rem;
}

/* ===== Status ===== */
.status {
  font-size: 0.8125rem;
  color: var(--text-muted);
  padding: 0.375rem 0.75rem;
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  display: inline-block;
}

.status-large {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.status-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--danger);
}

.status-dot.online {
  background: var(--success);
}

/* ===== Buttons ===== */
.btn {
  background: var(--accent);
  color: white;
  border: none;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-sm);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: background var(--transition);
  margin-top: 0.5rem;
}

.btn:hover {
  background: var(--accent-hover);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.btn-secondary:hover {
  border-color: var(--accent);
}

.btn-danger {
  background: var(--danger);
}

.btn-danger:hover {
  background: #dc2626;
}

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

/* ===== Forms ===== */
.form-group {
  margin-bottom: 0.75rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--text-secondary);
}

input[type="text"],
textarea {
  width: 100%;
  padding: 0.625rem 0.875rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9375rem;
  font-family: inherit;
  transition: border-color var(--transition);
}

input[type="text"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent);
}

/* ===== Output ===== */
.output {
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.875rem;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.8125rem;
  color: var(--text-secondary);
  margin-top: 0.75rem;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 300px;
  overflow-y: auto;
}

/* ===== Feature List ===== */
.feature-list {
  list-style: none;
  margin-bottom: 1rem;
}

.feature-list li {
  padding: 0.375rem 0;
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

.feature-list li::before {
  content: "→ ";
  color: var(--accent);
  font-weight: bold;
}

/* ===== Camera ===== */
.camera-container {
  position: relative;
  background: #000;
  border-radius: var(--radius-sm);
  overflow: hidden;
  aspect-ratio: 16 / 9;
  display: flex;
  align-items: center;
  justify-content: center;
}

#camera-feed {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

#photo-img {
  width: 100%;
  border-radius: var(--radius-sm);
}

/* ===== Toast Notification ===== */
.toast {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  min-width: 280px;
  max-width: 380px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
  z-index: 2000;
  transform: translateX(calc(100% + 2rem));
  transition: transform 300ms ease;
}

.toast.show {
  transform: translateX(0);
}

.toast-title {
  font-weight: 700;
  font-size: 0.9375rem;
  margin-bottom: 0.25rem;
}

.toast-body {
  font-size: 0.8125rem;
  color: var(--text-secondary);
}

/* ===== Hidden ===== */
.hidden {
  display: none !important;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .mobile-header {
    display: flex;
  }

  .content {
    margin-left: 0;
    padding: 1rem;
    padding-top: calc(var(--mobile-header-height) + 1rem);
  }

  h1 {
    font-size: 1.5rem;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }
}