/* ===== ECG-PPG Platform — Light Theme ===== */

:root {
  --bg-color: #f4f6fb;
  --bg-gradient: linear-gradient(135deg, #e8ecf4 0%, #f4f6fb 40%, #faf8ff 100%);
  --panel-bg: rgba(255, 255, 255, 0.88);
  --panel-border: rgba(99, 102, 241, 0.10);
  --panel-shadow: 0 2px 12px rgba(99, 102, 241, 0.07);
  --text-main: #1e1e2e;
  --text-secondary: #374151;
  --text-muted: #6b7280;
  --accent-color: #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: #eef2ff;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --success-color: #10b981;
  --success-light: #ecfdf5;
  --danger-color: #ef4444;
  --danger-light: #fef2f2;
  --warning-color: #f59e0b;
  --warning-light: #fffbeb;
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --glass-blur: blur(16px);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --transition: all 0.2s ease;

  /* Chart colors */
  --color-ecg: #10b981;
  --color-ppg: #f59e0b;
  --color-pat: #6366f1;
  --color-rr: #06b6d4;
  --color-pp: #f97316;
}

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

body {
  background: var(--bg-gradient);
  color: var(--text-main);
  font-family: var(--font-family);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  line-height: 1.5;
}

/* ===== Glassmorphism Panels ===== */
.glass-panel {
  background: var(--panel-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--panel-shadow);
  transition: var(--transition);
}

.glass-panel:hover {
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.10);
}

/* ===== Typography ===== */
h1, h2, h3, h4 {
  color: var(--text-main);
  font-weight: 600;
  margin-bottom: 16px;
  letter-spacing: -0.3px;
}
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.15rem; }
h4 { font-size: 0.95rem; color: var(--text-muted); font-weight: 500; margin-bottom: 8px; }
p { color: var(--text-secondary); line-height: 1.6; margin-bottom: 12px; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  text-decoration: none;
  font-family: var(--font-family);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-hover) 100%);
  color: #fff;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.25);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.35);
}
.btn-primary:active { transform: translateY(0); }

.btn-outline {
  background: transparent;
  border: 1.5px solid var(--panel-border);
  color: var(--text-secondary);
}
.btn-outline:hover {
  background: var(--accent-light);
  border-color: var(--accent-color);
  color: var(--accent-color);
}

.btn-danger {
  background: linear-gradient(135deg, var(--danger-color) 0%, #dc2626 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(239, 68, 68, 0.25);
}
.btn-danger:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(239, 68, 68, 0.35);
}

.btn-success {
  background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
  color: white;
  box-shadow: 0 2px 8px rgba(16, 185, 129, 0.25);
}

.btn-sm {
  padding: 5px 12px;
  font-size: 0.8rem;
}

.btn-icon {
  padding: 6px;
  border-radius: 6px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition);
}
.btn-icon:hover {
  background: var(--accent-light);
  color: var(--accent-color);
}

/* ===== Forms ===== */
.form-group {
  margin-bottom: 18px;
}
.form-group label {
  display: block;
  margin-bottom: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
}
.form-control {
  width: 100%;
  padding: 10px 14px;
  background: #f9fafb;
  border: 1.5px solid #e5e7eb;
  border-radius: var(--radius-sm);
  color: var(--text-main);
  font-family: var(--font-family);
  font-size: 0.9rem;
  transition: var(--transition);
}
.form-control:focus {
  outline: none;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-glow);
  background: #fff;
}
.form-control::placeholder {
  color: #9ca3af;
}

/* ===== Navbar ===== */
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 32px;
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid rgba(99, 102, 241, 0.08);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.nav-brand {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--accent-color);
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-brand svg {
  stroke: var(--accent-color);
}
.nav-links {
  display: flex;
  gap: 8px;
  align-items: center;
}
.nav-links a {
  color: var(--text-muted);
  text-decoration: none;
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  font-size: 0.9rem;
  font-weight: 500;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--accent-color);
  background: var(--accent-light);
}

/* ===== Layout ===== */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 32px 24px;
  width: 100%;
}

/* ===== Utility ===== */
.hidden { display: none !important; }
.text-center { text-align: center; }
.mt-2 { margin-top: 8px; }
.mt-4 { margin-top: 16px; }
.mb-2 { margin-bottom: 8px; }
.mb-4 { margin-bottom: 16px; }
.gap-2 { gap: 8px; }
.gap-4 { gap: 16px; }

/* ===== Tables ===== */
.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
}
.data-table th, .data-table td {
  padding: 12px 16px;
  text-align: left;
  border-bottom: 1px solid #f0f0f5;
}
.data-table th {
  color: var(--text-muted);
  font-weight: 500;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: #fafafd;
}
.data-table tr:hover td {
  background: var(--accent-light);
}
.data-table tr:last-child td {
  border-bottom: none;
}

/* ===== Cards & Badges ===== */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: 99px;
  font-size: 0.75rem;
  font-weight: 500;
}
.badge-accent {
  background: var(--accent-light);
  color: var(--accent-color);
}
.badge-success {
  background: var(--success-light);
  color: var(--success-color);
}
.badge-danger {
  background: var(--danger-light);
  color: var(--danger-color);
}
.badge-warning {
  background: var(--warning-light);
  color: var(--warning-color);
}

/* ===== Metrics Section ===== */
.metrics-section {
  border-left: 3px solid var(--accent-color);
  padding-left: 14px;
  margin-bottom: 18px;
}
.metrics-section.ecg-metrics { border-color: var(--color-ecg); }
.metrics-section.ppg-metrics { border-color: var(--color-ppg); }
.metrics-section.pat-metrics { border-color: var(--color-pat); }

.metrics-section h5 {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-secondary);
}

.metrics-row {
  display: flex;
  justify-content: space-between;
  padding: 4px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.metrics-row .value {
  font-weight: 600;
  color: var(--text-main);
}

/* ===== Annotations List ===== */
.annotation-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  background: var(--danger-light);
  border: 1px solid rgba(239, 68, 68, 0.15);
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
  font-size: 0.85rem;
}
.annotation-item .time-range {
  color: var(--danger-color);
  font-weight: 500;
}

/* ===== Checkbox Toggles ===== */
.metric-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
  font-size: 0.85rem;
  cursor: pointer;
}
.metric-toggle input[type="checkbox"] {
  accent-color: var(--accent-color);
  width: 16px;
  height: 16px;
}

/* ===== Loader ===== */
@keyframes spin {
  100% { transform: rotate(360deg); }
}
.loader-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid #e5e7eb;
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 20px auto;
}

/* ===== Modal ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
}
.modal-panel {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 440px;
  width: 90%;
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.15);
}
.modal-panel h3 {
  margin-bottom: 12px;
}

/* ===== Plotly Overrides ===== */
.js-plotly-plot .plotly .bg {
  fill: transparent !important;
}

/* ===== Language Toggle ===== */
.btn-lang {
  padding: 4px 10px;
  border-radius: 6px;
  background: var(--accent-light);
  border: 1.5px solid var(--accent-color);
  color: var(--accent-color);
  cursor: pointer;
  font-family: var(--font-family);
  font-size: 0.8rem;
  font-weight: 600;
  transition: var(--transition);
  letter-spacing: 0.5px;
}
.btn-lang:hover {
  background: var(--accent-color);
  color: #fff;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .container {
    padding: 16px;
  }
}