/* ──────────────────────────────────────────────
   THEME VARIABLES
   ────────────────────────────────────────────── */
:root {
  --bg-primary: #0b0d13;
  --bg-secondary: #0a0c11;
  --bg-tertiary: #080a0f;
  --surface: rgba(255,255,255,0.035);
  --surface-hover: rgba(255,255,255,0.06);
  --surface-alt: rgba(255,255,255,0.025);
  --border: rgba(255,255,255,0.07);
  --border-light: rgba(255,255,255,0.04);
  --text-primary: #ffffff;
  --text-secondary: #e4e4e7;
  --text-tertiary: rgba(255,255,255,0.5);
  --text-muted: rgba(255,255,255,0.35);
  --text-faint: rgba(255,255,255,0.2);
  --accent: #6366f1;
  --accent-hover: #818cf8;
  --accent-deep: #4f46e5;
  --accent-surface: rgba(99,102,241,0.1);
  --accent-border: rgba(99,102,241,0.15);
  --accent-glow: rgba(99,102,241,0.25);
  --shadow: rgba(0,0,0,0.2);
  --shadow-heavy: rgba(0,0,0,0.3);
  --input-bg: #16181f;
  --sidebar-bg: rgba(11,13,19,0.97);
  --sidebar-top: rgba(30,27,75,0.12);
  --scrollbar-thumb: rgba(255,255,255,0.08);
  --scrollbar-thumb-hover: rgba(255,255,255,0.14);
  --danger: #ef4444;
  --success: #22c55e;
  --warning: #f59e0b;
  --chart-grid: rgba(30,27,75,0.15);
  --chart-text: #71717a;
  --plot-bg: rgba(0,0,0,0);
  --upload-hover-shadow: rgba(99,102,241,0.08);
  --loading-bg: rgba(6,6,10,0.85);
  --table-cell-border: rgba(255,255,255,0.04);
  --card-bg-tint: rgba(255,255,255,0.035);
}

[data-theme="light"] {
  --bg-primary: #eef0f7;
  --bg-secondary: #e6e8f2;
  --bg-tertiary: #dfe2ee;
  --surface: #ffffff;
  --surface-hover: #f6f7fb;
  --surface-alt: #f0f1f8;
  --border: #c7cad6;
  --border-light: #dddfe8;
  --text-primary: #111827;
  --text-secondary: #374151;
  --text-tertiary: #5b6078;
  --text-muted: #8b90a5;
  --text-faint: #b5b8c8;
  --accent: #4f46e5;
  --accent-hover: #6366f1;
  --accent-deep: #4338ca;
  --accent-surface: rgba(79,70,229,0.07);
  --accent-border: rgba(79,70,229,0.25);
  --accent-glow: rgba(79,70,229,0.15);
  --shadow: rgba(55,48,120,0.08);
  --shadow-heavy: rgba(55,48,120,0.14);
  --input-bg: #ffffff;
  --sidebar-bg: rgba(255,255,255,0.97);
  --sidebar-top: rgba(79,70,229,0.12);
  --scrollbar-thumb: rgba(79,70,229,0.12);
  --scrollbar-thumb-hover: rgba(79,70,229,0.25);
  --danger: #dc2626;
  --success: #16a34a;
  --warning: #d97706;
  --chart-grid: rgba(79,70,229,0.08);
  --chart-text: #4b5563;
  --plot-bg: rgba(0,0,0,0);
  --upload-hover-shadow: rgba(79,70,229,0.15);
  --loading-bg: rgba(238,240,247,0.94);
  --table-cell-border: #c7cad6;
  --card-bg-tint: rgba(79,70,229,0.025);
}
/* ──────────────────────────────────────────────
   RESET & BASE
   ────────────────────────────────────────────── */
*, *::before, *::after {
  margin: 0; padding: 0; box-sizing: border-box;
}
html {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 14px;
  color: var(--text-secondary);
  background: var(--bg-primary);
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background 0.3s ease, color 0.3s ease;
}
body {
  overflow-x: hidden;
  background:
    radial-gradient(ellipse 70% 50% at 15% 5%, var(--accent-glow) 0%, transparent 50%),
    radial-gradient(ellipse 60% 40% at 85% 15%, var(--accent-surface) 0%, transparent 50%),
    radial-gradient(ellipse 50% 50% at 50% 90%, var(--sidebar-top) 0%, transparent 50%),
    linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 50%, var(--bg-tertiary) 100%);
  min-height: 100vh;
  transition: background 0.3s ease;
}

/* ──────────────────────────────────────────────
   SCROLLBAR
   ────────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-thumb-hover, rgba(255,255,255,0.14)); }

/* ──────────────────────────────────────────────
   ANIMATIONS
   ────────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes cardIn {
  from { opacity: 0; transform: translateY(16px) scale(0.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.4; }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
@keyframes glowPulse {
  0%, 100% { box-shadow: 0 0 20px rgba(99,102,241,0.15); }
  50% { box-shadow: 0 0 35px rgba(99,102,241,0.25); }
}

/* ──────────────────────────────────────────────
   LAYOUT
   ────────────────────────────────────────────── */
.sidebar {
  position: fixed; left: 0; top: 0; bottom: 0;
  width: 220px; z-index: 100;
  background: linear-gradient(180deg, var(--sidebar-top) 0%, var(--sidebar-bg) 40%, var(--sidebar-bg) 100%);
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column;
  padding: 28px 16px 20px;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}
.sidebar::after {
  content: '';
  position: absolute; bottom: 0; left: 16px; right: 16px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-border), transparent);
}
.main-content {
  margin-left: 220px;
  min-height: 100vh;
  padding: 36px 40px 60px;
}

/* ──────────────────────────────────────────────
   SIDEBAR
   ────────────────────────────────────────────── */
.sidebar-logo {
  font-size: 22px; font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--text-primary);
  padding: 0 8px 28px;
  display: flex; align-items: center;
  position: relative;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 50%, #a78bfa 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.sidebar-logo::before {
  content: '';
  position: absolute; left: -4px; top: -6px;
  width: 30px; height: 30px; border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  filter: blur(10px);
  pointer-events: none;
}
.sidebar-nav { display: flex; flex-direction: column; gap: 4px; }
.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-radius: 10px;
  font-size: 13.5px; font-weight: 500;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all 0.2s ease;
  text-decoration: none;
  border: 1px solid transparent;
}
.nav-item:hover {
  color: var(--text-secondary);
  background: var(--surface-alt);
}
.nav-item.active {
  color: var(--text-primary);
  background: var(--accent-surface);
  border-color: var(--accent-border);
  box-shadow: 0 0 20px var(--accent-glow);
}
.nav-item.active svg { color: var(--accent); }
.nav-item svg {
  width: 18px; height: 18px;
  color: var(--text-muted);
  transition: color 0.2s ease;
  flex-shrink: 0;
}

/* ──────────────────────────────────────────────
   SECTIONS
   ────────────────────────────────────────────── */
.section { display: none; }
.section.active { display: block; animation: fadeIn 0.35s ease; }
.section-title {
  font-size: 24px; font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary); margin-bottom: 6px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-hover) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.section-subtitle {
  font-size: 13px; font-weight: 400;
  color: var(--text-muted);
  margin-bottom: 28px;
}

/* ──────────────────────────────────────────────
   CARD (GLASSMORPHISM)
   ────────────────────────────────────────────── */
.card {
  background: var(--surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 24px;
  transition: all 0.25s ease;
  animation: cardIn 0.4s ease both;
}
.card:hover {
  border-color: var(--accent-border);
  box-shadow: 0 8px 32px var(--shadow-heavy), 0 0 0 1px rgba(99,102,241,0.05);
}
.card + .card { margin-top: 20px; }
.card-label {
  font-size: 10px; font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  margin-bottom: 6px;
}
.card-value {
  font-size: 28px; font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

/* ──────────────────────────────────────────────
   METRICS GRID
   ────────────────────────────────────────────── */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 24px;
}
.metrics-grid .card {
  text-align: center; padding: 20px 14px;
  position: relative;
  overflow: hidden;
}
.metrics-grid .card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, #6366f1, #818cf8);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.metrics-grid .card:hover::before { opacity: 1; }
.metrics-grid .card:nth-child(1) { animation-delay: 0.05s; }
.metrics-grid .card:nth-child(2) { animation-delay: 0.1s; }
.metrics-grid .card:nth-child(3) { animation-delay: 0.15s; }
.metrics-grid .card:nth-child(4) { animation-delay: 0.2s; }
.metrics-grid .card:nth-child(1):hover::before { background: linear-gradient(90deg, #6366f1, #818cf8); }
.metrics-grid .card:nth-child(2):hover::before { background: linear-gradient(90deg, #4f46e5, #6366f1); }
.metrics-grid .card:nth-child(3):hover::before { background: linear-gradient(90deg, #1e1b4b, #4f46e5); }
.metrics-grid .card:nth-child(4):hover::before { background: linear-gradient(90deg, #818cf8, #6366f1); }

/* ──────────────────────────────────────────────
   UPLOAD AREA
   ────────────────────────────────────────────── */
.upload-area {
  border: 2px dashed var(--text-faint);
  border-radius: 14px;
  padding: 48px 24px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  background: var(--surface-alt);
  margin-bottom: 24px;
  position: relative;
}
.upload-area:hover, .upload-area.dragover {
  border-color: var(--accent);
  background: var(--accent-surface);
  box-shadow: 0 0 40px var(--upload-hover-shadow), inset 0 0 40px rgba(99,102,241,0.02);
}
.upload-area svg {
  width: 40px; height: 40px;
  color: var(--text-faint);
  margin-bottom: 14px;
  transition: all 0.3s ease;
}
.upload-area:hover svg, .upload-area.dragover svg {
  color: var(--accent);
  transform: translateY(-2px);
}
.upload-area-title {
  font-size: 14px; font-weight: 600; color: var(--text-primary);
  margin-bottom: 4px;
}
.upload-area-sub {
  font-size: 12px; color: var(--text-muted);
}
.upload-area input[type="file"] { display: none; }

/* ──────────────────────────────────────────────
   TABS
   ────────────────────────────────────────────── */
.tab-bar {
  display: flex; gap: 4px;
  padding: 4px;
  background: var(--surface-alt);
  border-radius: 10px;
  margin-bottom: 20px;
  border: 1px solid var(--border);
  flex-wrap: wrap;
}
.tab-btn {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 12.5px; font-weight: 500;
  color: var(--text-tertiary);
  cursor: pointer;
  transition: all 0.2s ease;
  border: none; background: none;
  white-space: nowrap;
}
.tab-btn:hover { color: var(--text-secondary); }
.tab-btn.active {
  background: var(--accent);
  color: #fff; font-weight: 600;
  box-shadow: 0 1px 4px var(--accent-glow);
}
.tab-panel { display: none; }
.tab-panel.active { display: block; animation: fadeIn 0.25s ease; }

/* ──────────────────────────────────────────────
   TABLE
   ────────────────────────────────────────────── */
.table-wrap {
  overflow-x: auto; border-radius: 10px;
  border: 1px solid var(--border);
}
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12.5px;
}
.data-table th {
  padding: 10px 14px;
  text-align: left;
  font-weight: 600; font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  background: var(--surface-alt);
  border-bottom: 2px solid var(--border);
  position: sticky; top: 0;
  white-space: nowrap;
}
.data-table td {
  padding: 9px 14px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text-secondary);
  white-space: nowrap;
  max-width: 220px; overflow: hidden;
  text-overflow: ellipsis;
}
.data-table tbody tr {
  transition: all 0.15s ease;
}
.data-table tbody tr:hover {
  background: var(--accent-surface);
}
.data-table tbody tr:first-child {
  background: var(--accent-surface);
}
.data-table tbody tr:first-child td:first-child {
  border-left: 2px solid var(--accent);
}
.data-table tbody tr:last-child td { border-bottom: none; }

/* ──────────────────────────────────────────────
   BUTTONS
   ────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 22px; border-radius: 10px;
  font-family: inherit; font-size: 13px; font-weight: 600;
  cursor: pointer; border: none;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.btn:active { transform: scale(0.97); }
.btn-primary {
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%); color: #fff;
  box-shadow: 0 2px 8px rgba(99,102,241,0.25), 0 1px 2px rgba(0,0,0,0.2);
  position: relative;
  overflow: hidden;
}
.btn-primary::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.15) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.2s ease;
}
.btn-primary:hover::before { opacity: 1; }
.btn-primary:hover {
  box-shadow: 0 4px 24px rgba(99,102,241,0.4), 0 1px 3px rgba(0,0,0,0.3);
  transform: translateY(-1px);
}
.btn-primary:disabled {
  opacity: 0.4; cursor: not-allowed;
  transform: none; box-shadow: none;
}
.btn-primary:disabled::before { display: none; }
.btn-secondary {
  background: var(--surface);
  color: var(--text-secondary);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-surface);
  transform: translateY(-1px);
}
.btn-sm { padding: 7px 14px; font-size: 12px; border-radius: 8px; }

/* ──────────────────────────────────────────────
   FORM ELEMENTS
   ────────────────────────────────────────────── */
.form-group { margin-bottom: 18px; }
.form-label {
  display: block; font-size: 12px; font-weight: 500;
  color: var(--text-tertiary);
  margin-bottom: 6px;
}
.form-select, .form-input {
  width: 100%; padding: 9px 12px;
  background: var(--input-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-secondary);
  font-family: inherit; font-size: 13px;
  transition: all 0.2s ease;
  appearance: none;
  outline: none;
}
.form-select:focus, .form-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-select {
  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='%2371717a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 32px;
}
.form-select option { background: var(--input-bg); color: var(--text-secondary); }
.form-select optgroup { background: var(--surface-alt); color: var(--text-muted); font-style: normal; font-weight: 600; font-size: 11px; letter-spacing: 0.04em; text-transform: uppercase; }
.form-select optgroup option { color: var(--text-secondary); font-weight: 400; font-size: 13px; text-transform: none; letter-spacing: 0; padding-left: 8px; }

/* Range slider */
.range-wrap { display: flex; align-items: center; gap: 12px; }
.range-wrap input[type="range"] {
  flex: 1; height: 4px;
  -webkit-appearance: none; appearance: none;
  background: var(--border);
  border-radius: 2px; outline: none;
}
.range-wrap input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent); cursor: pointer;
  border: 2px solid var(--bg-primary);
  transition: box-shadow 0.2s ease;
  box-shadow: 0 1px 3px var(--shadow);
}
.range-wrap input[type="range"]::-webkit-slider-thumb:hover {
  box-shadow: 0 0 0 4px var(--accent-glow);
}
.range-val {
  font-size: 13px; font-weight: 600;
  color: var(--text-primary); min-width: 32px;
  text-align: right;
}

/* ──────────────────────────────────────────────
   CHECKBOX GRID
   ────────────────────────────────────────────── */
.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.checkbox-item {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 12px;
  border-radius: 8px;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 12.5px; font-weight: 500;
  color: var(--text-tertiary);
}
.checkbox-item:hover {
  border-color: var(--accent-border);
  color: var(--text-primary);
}
.checkbox-item input[type="checkbox"] {
  -webkit-appearance: none; appearance: none;
  width: 16px; height: 16px;
  border-radius: 4px;
  border: 1.5px solid var(--text-faint);
  background: var(--input-bg);
  cursor: pointer;
  transition: all 0.2s ease;
  flex-shrink: 0;
  position: relative;
}
.checkbox-item input[type="checkbox"]:checked {
  background: #6366f1;
  border-color: #6366f1;
}
.checkbox-item input[type="checkbox"]:checked::after {
  content: '';
  position: absolute;
  left: 4px; top: 1px;
  width: 5px; height: 9px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}

/* ──────────────────────────────────────────────
   TASK BADGE
   ────────────────────────────────────────────── */
.task-badge {
  display: inline-flex; align-items: center;
  padding: 4px 12px; border-radius: 20px;
  font-size: 11.5px; font-weight: 600;
  letter-spacing: 0.02em;
  background: var(--accent-surface);
  color: var(--accent);
  border: 1px solid var(--accent-border);
}

/* ──────────────────────────────────────────────
   RADIO GROUP
   ────────────────────────────────────────────── */
.radio-group { display: flex; gap: 8px; margin-bottom: 18px; }
.radio-item {
  padding: 9px 20px; border-radius: 8px;
  font-size: 13px; font-weight: 500;
  color: var(--text-tertiary);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s ease;
}
.radio-item:hover { border-color: var(--accent-border); color: var(--text-secondary); }
.radio-item.active {
  background: var(--accent-surface);
  border-color: var(--accent-border);
  color: var(--accent); font-weight: 600;
}
.radio-item input { display: none; }

/* ──────────────────────────────────────────────
   COLLAPSIBLE
   ────────────────────────────────────────────── */
.collapsible-header {
  display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; padding: 14px 0;
  font-size: 13px; font-weight: 600; color: var(--text-primary);
  user-select: none;
}
.collapsible-header svg {
  width: 16px; height: 16px;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}
.collapsible-header.open svg { transform: rotate(180deg); }
.collapsible-body {
  max-height: 0; overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s ease;
}
.collapsible-body.open {
  max-height: 600px;
  padding-bottom: 16px;
}

/* ──────────────────────────────────────────────
   LOADING OVERLAY
   ────────────────────────────────────────────── */
.loading-overlay {
  position: absolute; inset: 0;
  background: var(--loading-bg, rgba(6,6,10,0.85));
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  border-radius: 14px;
  z-index: 50;
  gap: 16px;
}
.loading-overlay.hidden { display: none; }
.spinner {
  width: 36px; height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-right-color: var(--accent-glow);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  box-shadow: 0 0 16px var(--accent-glow);
}
.loading-text {
  font-size: 13px; font-weight: 500;
  color: var(--text-tertiary);
  animation: pulse 1.5s ease-in-out infinite;
}

/* ──────────────────────────────────────────────
   PLOT GRID
   ────────────────────────────────────────────── */
.plot-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}
.plot-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.25s ease;
}
.plot-card:hover {
  border-color: var(--accent-border);
  box-shadow: 0 4px 20px var(--shadow-heavy);
  transform: translateY(-2px);
}
.plot-card-title {
  padding: 12px 16px 8px;
  font-size: 12px; font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.plot-card img {
  width: 100%; display: block;
  padding: 0 8px 8px;
}

/* ──────────────────────────────────────────────
   DOWNLOAD ROW
   ────────────────────────────────────────────── */
.download-row {
  display: flex; gap: 14px;
  flex-wrap: wrap;
}

/* ──────────────────────────────────────────────
   CHART CONTAINER
   ────────────────────────────────────────────── */
.chart-container {
  width: 100%;
  min-height: 380px;
  border-radius: 10px;
  overflow: hidden;
}

/* ──────────────────────────────────────────────
   INLINE FLEX HELPERS
   ────────────────────────────────────────────── */
.flex-row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.flex-col { display: flex; flex-direction: column; }
.gap-sm { gap: 8px; }
.gap-md { gap: 14px; }
.mt-sm { margin-top: 12px; }
.mt-md { margin-top: 20px; }
.mt-lg { margin-top: 32px; }
.mb-md { margin-bottom: 20px; }
.w-auto { width: auto; }
.relative { position: relative; }

/* ──────────────────────────────────────────────
   TARGET ROW
   ────────────────────────────────────────────── */
.target-row {
  display: flex; align-items: center; gap: 14px;
  padding: 16px 0;
}
.target-row .form-select { width: 260px; }

/* ──────────────────────────────────────────────
   SUMMARY GRID
   ────────────────────────────────────────────── */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-bottom: 24px;
}

/* ──────────────────────────────────────────────
   INSIGHT CARDS
   ────────────────────────────────────────────── */
.insights-grid {
  display: flex; flex-direction: column; gap: 8px;
  margin-bottom: 20px;
}
.insight-card {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 12px 16px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  border-left: 3px solid var(--text-faint);
  animation: fadeIn 0.3s ease both;
}
.insight-card.success { border-left-color: var(--success); }
.insight-card.warning { border-left-color: var(--warning); }
.insight-card.info { border-left-color: var(--accent); }
.insight-icon {
  width: 18px; height: 18px; flex-shrink: 0; margin-top: 1px;
}
.insight-card.success .insight-icon { color: var(--success); }
.insight-card.warning .insight-icon { color: var(--warning); }
.insight-card.info .insight-icon { color: var(--accent); }
.insight-title {
  font-size: 12.5px; font-weight: 600; color: var(--text-primary);
  margin-bottom: 2px;
}
.insight-detail {
  font-size: 12px; color: var(--text-tertiary);
  line-height: 1.5;
}

/* ──────────────────────────────────────────────
   TRAINING SUMMARY
   ────────────────────────────────────────────── */
.summary-banner {
  padding: 20px 24px;
  background: linear-gradient(135deg, var(--accent-surface) 0%, var(--surface) 100%);
  border: 1px solid var(--accent-border);
  border-radius: 14px;
  margin-bottom: 20px;
}
.summary-text {
  font-size: 13px; color: var(--text-tertiary);
  line-height: 1.6; margin-top: 12px;
}
.summary-stats {
  display: flex; gap: 24px; margin-top: 14px; flex-wrap: wrap;
}
.summary-stat {
  display: flex; flex-direction: column; gap: 2px;
}
.summary-stat-label {
  font-size: 10px; font-weight: 700; text-transform: uppercase;
  letter-spacing: 0.06em; color: var(--text-muted);
}
.summary-stat-value {
  font-size: 18px; font-weight: 700; color: var(--text-primary);
}
.feature-pill {
  display: inline-flex; align-items: center;
  padding: 3px 10px; border-radius: 20px;
  font-size: 11px; font-weight: 500;
  background: var(--accent-surface);
  color: var(--accent-hover);
  border: 1px solid var(--accent-border);
  margin-right: 6px; margin-top: 4px;
}

/* ──────────────────────────────────────────────
   THEME TOGGLE BUTTON
   ────────────────────────────────────────────── */
.theme-toggle {
  position: fixed; top: 16px; right: 20px;
  z-index: 200;
  width: 38px; height: 38px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: all 0.25s ease;
  color: var(--text-tertiary);
}
.theme-toggle:hover {
  border-color: var(--accent-border);
  color: var(--accent);
  box-shadow: 0 2px 12px var(--shadow);
  transform: translateY(-1px);
}
.theme-toggle svg { width: 18px; height: 18px; transition: transform 0.3s ease; }
.theme-toggle:hover svg { transform: rotate(15deg); }

/* ──────────────────────────────────────────────
   LIGHT THEME OVERRIDES
   ────────────────────────────────────────────── */

/* ── Body: strong indigo-tinted ambient background ── */
[data-theme="light"] body {
  background:
    radial-gradient(ellipse 80% 60% at 10% 0%, rgba(79,70,229,0.1) 0%, transparent 55%),
    radial-gradient(ellipse 60% 50% at 90% 10%, rgba(99,102,241,0.06) 0%, transparent 50%),
    radial-gradient(ellipse 50% 50% at 50% 95%, rgba(79,70,229,0.05) 0%, transparent 50%),
    linear-gradient(180deg, #eef0f7 0%, #e6e8f2 40%, #dfe2ee 100%);
}

/* ── Sidebar: visible indigo background ── */
[data-theme="light"] .sidebar {
  background: linear-gradient(180deg, #c7c2f0 0%, #d4d0f4 35%, #dfdcf6 65%, #e8e6f8 100%);
  border-right: 1px solid rgba(79,70,229,0.2);
  backdrop-filter: none; -webkit-backdrop-filter: none;
  box-shadow: 3px 0 16px rgba(55,48,120,0.08);
}
[data-theme="light"] .sidebar::after {
  background: linear-gradient(90deg, transparent, rgba(79,70,229,0.2), transparent);
}

/* ── Cards: indigo-tinted surface + STRONG shadow for depth ── */
[data-theme="light"] .card {
  background: linear-gradient(135deg, rgba(79,70,229,0.025) 0%, #ffffff 100%);
  border: 1px solid rgba(79,70,229,0.12);
  box-shadow:
    0 1px 2px rgba(55,48,120,0.06),
    0 4px 12px rgba(55,48,120,0.08),
    0 8px 28px rgba(55,48,120,0.06);
  backdrop-filter: none; -webkit-backdrop-filter: none;
}
[data-theme="light"] .card:hover {
  border-color: rgba(79,70,229,0.3);
  box-shadow:
    0 2px 4px rgba(55,48,120,0.08),
    0 8px 24px rgba(55,48,120,0.12),
    0 16px 40px rgba(55,48,120,0.08),
    0 0 0 1px rgba(79,70,229,0.08);
  transform: translateY(-1px);
}

/* ── Metrics cards: slightly stronger tint ── */
[data-theme="light"] .metrics-grid .card {
  background: linear-gradient(135deg, rgba(79,70,229,0.04) 0%, #ffffff 100%);
}

/* ── Table: VISIBLE column borders + colored header ── */
[data-theme="light"] .table-wrap {
  border: 1px solid rgba(79,70,229,0.12);
  box-shadow:
    0 2px 8px rgba(55,48,120,0.06),
    0 6px 20px rgba(55,48,120,0.05);
  border-radius: 12px;
}
[data-theme="light"] .data-table th {
  background: linear-gradient(180deg, #e8e9f4 0%, #f0f1f8 100%);
  color: #374151;
  border-bottom: 2px solid #b4b7cc;
  border-right: 1px solid #d0d3e0;
}
[data-theme="light"] .data-table th:last-child { border-right: none; }
[data-theme="light"] .data-table td {
  border-bottom: 1px solid #dddfe8;
  border-right: 1px solid #e8eaf0;
  color: #374151;
}
[data-theme="light"] .data-table td:last-child { border-right: none; }
[data-theme="light"] .data-table tbody tr:hover { background: rgba(79,70,229,0.05); }
[data-theme="light"] .data-table tbody tr:nth-child(even) { background: rgba(79,70,229,0.02); }

/* ── Plot cards: indigo-tinted + depth shadow ── */
[data-theme="light"] .plot-card {
  background: linear-gradient(135deg, rgba(79,70,229,0.025) 0%, #ffffff 100%);
  border: 1px solid rgba(79,70,229,0.12);
  box-shadow:
    0 1px 2px rgba(55,48,120,0.06),
    0 4px 12px rgba(55,48,120,0.08),
    0 8px 28px rgba(55,48,120,0.05);
}
[data-theme="light"] .plot-card:hover {
  box-shadow:
    0 4px 12px rgba(55,48,120,0.1),
    0 12px 32px rgba(55,48,120,0.08);
  transform: translateY(-2px);
}

/* ── Tab bar: tinted ── */
[data-theme="light"] .tab-bar {
  background: #e8e9f4;
  border: 1px solid #c7cad6;
}
[data-theme="light"] .tab-btn.active {
  box-shadow: 0 2px 6px rgba(79,70,229,0.2);
}

/* ── Insight cards: tinted + shadow ── */
[data-theme="light"] .insight-card {
  background: linear-gradient(135deg, rgba(79,70,229,0.025) 0%, #ffffff 100%);
  border: 1px solid rgba(79,70,229,0.1);
  box-shadow: 0 2px 8px rgba(55,48,120,0.06), 0 4px 16px rgba(55,48,120,0.04);
}

/* ── Summary banner: tinted + shadow ── */
[data-theme="light"] .summary-banner {
  background: linear-gradient(135deg, rgba(79,70,229,0.07) 0%, rgba(255,255,255,0.95) 100%);
  border: 1px solid rgba(79,70,229,0.15);
  box-shadow:
    0 2px 6px rgba(55,48,120,0.06),
    0 6px 20px rgba(55,48,120,0.05);
}

/* ── Upload area: shadow ── */
[data-theme="light"] .upload-area {
  background: linear-gradient(135deg, rgba(79,70,229,0.02) 0%, #ffffff 100%);
  border: 2px dashed #b5b8c8;
  box-shadow: 0 2px 8px rgba(55,48,120,0.05), 0 4px 16px rgba(55,48,120,0.04);
}
[data-theme="light"] .upload-area:hover {
  box-shadow: 0 4px 16px rgba(79,70,229,0.12), 0 8px 28px rgba(55,48,120,0.06);
}

/* ── Checkbox items: tinted + subtle shadow ── */
[data-theme="light"] .checkbox-item {
  background: linear-gradient(135deg, rgba(79,70,229,0.02) 0%, #ffffff 100%);
  box-shadow: 0 1px 3px rgba(55,48,120,0.06);
}
[data-theme="light"] .checkbox-item:hover {
  box-shadow: 0 2px 8px rgba(79,70,229,0.1);
}

/* ── Best model card ── */
[data-theme="light"] #best-model-card {
  border-left: 3px solid #4f46e5 !important;
  background: linear-gradient(135deg, rgba(79,70,229,0.08) 0%, #ffffff 100%) !important;
  box-shadow: 0 2px 8px rgba(55,48,120,0.1), 0 6px 24px rgba(55,48,120,0.08) !important;
}

/* ── Theme toggle button ── */
[data-theme="light"] .theme-toggle {
  background: #ffffff;
  border: 1px solid rgba(79,70,229,0.15);
  box-shadow: 0 2px 8px rgba(55,48,120,0.1), 0 4px 16px rgba(55,48,120,0.06);
}

/* ── Inline white text safety ── */
[data-theme="light"] span[style*="color:#fff"],
[data-theme="light"] span[style*="color: #fff"],
[data-theme="light"] div[style*="color:#fff"],
[data-theme="light"] div[style*="color: #fff"] { color: #111827 !important; }


/* ──────────────────────────────────────────────
   RESPONSIVE
   ────────────────────────────────────────────── */
@media (max-width: 900px) {
  .sidebar { width: 60px; padding: 20px 8px; }
  .sidebar-logo span { display: none; }
  .nav-item span { display: none; }
  .nav-item { justify-content: center; padding: 10px; }
  .main-content { margin-left: 60px; padding: 24px 16px; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .checkbox-grid { grid-template-columns: repeat(2, 1fr); }
  .plot-grid { grid-template-columns: 1fr; }
  .summary-grid { grid-template-columns: 1fr; }
}