/* ═══════════════════════════════════════════════════════════
   EEG Research Dashboard — Global Styles
   Author: Sadiq Mansoor
═══════════════════════════════════════════════════════════ */

:root {
  --bg-primary:    #0a0e1a;
  --bg-secondary:  #0f1629;
  --bg-card:       rgba(255,255,255,0.04);
  --bg-card-hover: rgba(255,255,255,0.07);
  --border:        rgba(255,255,255,0.08);
  --border-accent: rgba(99,179,237,0.3);
  --accent-blue:   #63b3ed;
  --accent-cyan:   #4fd1c5;
  --accent-purple: #9f7aea;
  --accent-green:  #68d391;
  --accent-orange: #f6ad55;
  --accent-red:    #fc8181;
  --text-primary:  #e2e8f0;
  --text-secondary:#94a3b8;
  --text-muted:    #64748b;
  --font:          'Inter', -apple-system, sans-serif;
  --radius:        12px;
  --radius-lg:     18px;
  --shadow:        0 4px 24px rgba(0,0,0,0.4);
  --shadow-lg:     0 8px 40px rgba(0,0,0,0.6);
  --transition:    0.2s ease;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
}

/* ── Layout ─────────────────────────────────────────────── */
.layout { display: flex; min-height: 100vh; }

/* ── Sidebar ─────────────────────────────────────────────── */
.sidebar {
  width: 260px;
  min-width: 260px;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 100;
  transition: transform var(--transition);
}

.sidebar-brand {
  padding: 24px 20px 16px;
  border-bottom: 1px solid var(--border);
}

.sidebar-brand .logo {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 8px;
}

.sidebar-brand .logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; color: white;
}

.sidebar-brand h1 {
  font-size: 13px; font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.sidebar-brand .subtitle {
  font-size: 10px; color: var(--text-muted);
  margin-top: 2px;
}

.sidebar-author {
  padding: 10px 20px;
  font-size: 10px; color: var(--text-muted);
  border-bottom: 1px solid var(--border);
}

.sidebar-author span { color: var(--accent-cyan); }

.sidebar-nav { flex: 1; padding: 12px 0; }

.nav-section-label {
  padding: 8px 20px 4px;
  font-size: 9px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1.2px;
  color: var(--text-muted);
}

.nav-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 20px;
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 13px; font-weight: 500;
  border-left: 3px solid transparent;
  transition: all var(--transition);
  cursor: pointer;
}

.nav-item:hover {
  background: var(--bg-card);
  color: var(--text-primary);
  border-left-color: var(--accent-blue);
}

.nav-item.active {
  background: rgba(99,179,237,0.08);
  color: var(--accent-blue);
  border-left-color: var(--accent-blue);
}

.nav-item i { width: 16px; text-align: center; font-size: 12px; }

.sidebar-footer {
  padding: 16px 20px;
  border-top: 1px solid var(--border);
}

.run-btn {
  width: 100%;
  padding: 10px;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border: none; border-radius: var(--radius);
  color: white; font-size: 12px; font-weight: 600;
  cursor: pointer; display: flex; align-items: center;
  justify-content: center; gap: 8px;
  transition: opacity var(--transition);
}

.run-btn:hover { opacity: 0.85; }

/* ── Main Content ────────────────────────────────────────── */
.main {
  margin-left: 260px;
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Top Bar ─────────────────────────────────────────────── */
.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10,14,26,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 12px 32px;
  display: flex; align-items: center; justify-content: space-between;
}

.topbar-title { font-size: 14px; font-weight: 600; color: var(--text-primary); }
.topbar-meta  { font-size: 11px; color: var(--text-muted); }

.topbar-badges { display: flex; gap: 8px; }

.badge {
  padding: 3px 10px;
  border-radius: 20px;
  font-size: 10px; font-weight: 600;
  border: 1px solid;
}

.badge-blue   { color: var(--accent-blue);   border-color: var(--accent-blue);   background: rgba(99,179,237,0.08); }
.badge-green  { color: var(--accent-green);  border-color: var(--accent-green);  background: rgba(104,211,145,0.08); }
.badge-purple { color: var(--accent-purple); border-color: var(--accent-purple); background: rgba(159,122,234,0.08); }
.badge-orange { color: var(--accent-orange); border-color: var(--accent-orange); background: rgba(246,173,85,0.08); }
.badge-red    { color: var(--accent-red);    border-color: var(--accent-red);    background: rgba(252,129,129,0.08); }
.badge-cyan   { color: var(--accent-cyan);   border-color: var(--accent-cyan);   background: rgba(79,209,197,0.08); }

/* ── Page Content ────────────────────────────────────────── */
.page { display: none; padding: 32px; }
.page.active { display: block; }

/* ── Section Headers ─────────────────────────────────────── */
.section-header {
  margin-bottom: 24px;
}

.section-header h2 {
  font-size: 22px; font-weight: 700;
  color: var(--text-primary);
  display: flex; align-items: center; gap: 10px;
}

.section-header h2 i { color: var(--accent-blue); font-size: 18px; }

.section-header p {
  margin-top: 6px;
  font-size: 13px; color: var(--text-secondary);
  max-width: 700px;
}

/* ── Cards ───────────────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color var(--transition), background var(--transition);
}

.card:hover {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.card-title {
  font-size: 12px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.8px;
  color: var(--text-muted);
  margin-bottom: 16px;
  display: flex; align-items: center; gap: 8px;
}

.card-title i { color: var(--accent-blue); }

/* ── KPI Cards ───────────────────────────────────────────── */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 20px;
  position: relative;
  overflow: hidden;
  transition: all var(--transition);
}

.kpi-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
}

.kpi-card.blue::before   { background: var(--accent-blue); }
.kpi-card.cyan::before   { background: var(--accent-cyan); }
.kpi-card.purple::before { background: var(--accent-purple); }
.kpi-card.green::before  { background: var(--accent-green); }
.kpi-card.orange::before { background: var(--accent-orange); }
.kpi-card.red::before    { background: var(--accent-red); }

.kpi-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.kpi-icon {
  width: 36px; height: 36px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 15px; margin-bottom: 12px;
}

.kpi-card.blue   .kpi-icon { background: rgba(99,179,237,0.15);  color: var(--accent-blue); }
.kpi-card.cyan   .kpi-icon { background: rgba(79,209,197,0.15);  color: var(--accent-cyan); }
.kpi-card.purple .kpi-icon { background: rgba(159,122,234,0.15); color: var(--accent-purple); }
.kpi-card.green  .kpi-icon { background: rgba(104,211,145,0.15); color: var(--accent-green); }
.kpi-card.orange .kpi-icon { background: rgba(246,173,85,0.15);  color: var(--accent-orange); }
.kpi-card.red    .kpi-icon { background: rgba(252,129,129,0.15); color: var(--accent-red); }

.kpi-value {
  font-size: 28px; font-weight: 800;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 4px;
}

.kpi-label {
  font-size: 11px; color: var(--text-muted);
  font-weight: 500;
}

.kpi-sub {
  font-size: 10px; color: var(--text-muted);
  margin-top: 6px;
}

/* ── Grid Layouts ────────────────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; }
.grid-auto { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; }

/* ── Tables ──────────────────────────────────────────────── */
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 12px;
}

thead th {
  padding: 10px 14px;
  text-align: left;
  font-size: 10px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 0.8px;
  color: var(--text-muted);
  background: rgba(255,255,255,0.03);
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

tbody td {
  padding: 10px 14px;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  color: var(--text-secondary);
  white-space: nowrap;
}

tbody tr:hover td { background: rgba(255,255,255,0.03); color: var(--text-primary); }

.td-highlight { color: var(--accent-cyan) !important; font-weight: 700; }
.td-best      { color: var(--accent-green) !important; font-weight: 700; }
.td-warn      { color: var(--accent-orange) !important; }
.td-bad       { color: var(--accent-red) !important; }

/* ── Charts ──────────────────────────────────────────────── */
.chart-container {
  position: relative;
  width: 100%;
}

canvas { max-width: 100%; }

/* ── Hero Section ────────────────────────────────────────── */
.hero {
  background: linear-gradient(135deg,
    rgba(99,179,237,0.06) 0%,
    rgba(159,122,234,0.06) 50%,
    rgba(79,209,197,0.06) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  margin-bottom: 28px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%; right: -10%;
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(99,179,237,0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 12px;
  background: rgba(99,179,237,0.1);
  border: 1px solid rgba(99,179,237,0.2);
  border-radius: 20px;
  font-size: 10px; font-weight: 700;
  color: var(--accent-blue);
  text-transform: uppercase; letter-spacing: 1px;
  margin-bottom: 16px;
}

.hero h1 {
  font-size: 28px; font-weight: 800;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 12px;
}

.hero h1 span { color: var(--accent-blue); }

.hero-question {
  font-size: 14px; color: var(--text-secondary);
  font-style: italic;
  border-left: 3px solid var(--accent-blue);
  padding-left: 14px;
  margin-bottom: 20px;
  max-width: 700px;
}

.hero-meta {
  display: flex; gap: 20px; flex-wrap: wrap;
}

.hero-meta-item {
  display: flex; align-items: center; gap: 6px;
  font-size: 12px; color: var(--text-muted);
}

.hero-meta-item i { color: var(--accent-cyan); }

/* ── Pipeline Flow ───────────────────────────────────────── */
.pipeline-flow {
  display: flex; align-items: center; gap: 0;
  flex-wrap: wrap;
  margin: 16px 0;
}

.pipeline-step {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 14px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 12px; font-weight: 500;
  color: var(--text-secondary);
}

.pipeline-step i { color: var(--accent-blue); font-size: 11px; }

.pipeline-arrow {
  padding: 0 8px;
  color: var(--text-muted);
  font-size: 12px;
}

/* ── Hypothesis Cards ────────────────────────────────────── */
.hyp-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}

.hyp-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
}

.hyp-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 10px;
}

.hyp-id {
  font-size: 10px; font-weight: 800;
  color: var(--accent-blue);
  text-transform: uppercase; letter-spacing: 1px;
}

.hyp-result {
  font-size: 10px; font-weight: 700;
  padding: 2px 8px; border-radius: 10px;
}

.hyp-result.rejected  { background: rgba(252,129,129,0.15); color: var(--accent-red); }
.hyp-result.accepted  { background: rgba(104,211,145,0.15); color: var(--accent-green); }
.hyp-result.partial   { background: rgba(246,173,85,0.15);  color: var(--accent-orange); }

.hyp-title { font-size: 13px; font-weight: 600; color: var(--text-primary); margin-bottom: 6px; }
.hyp-desc  { font-size: 11px; color: var(--text-secondary); line-height: 1.5; }
.hyp-pval  { margin-top: 10px; font-size: 11px; color: var(--text-muted); }
.hyp-pval span { color: var(--accent-cyan); font-weight: 600; }

/* ── Equation Block ──────────────────────────────────────── */
.equation-block {
  background: rgba(99,179,237,0.05);
  border: 1px solid rgba(99,179,237,0.15);
  border-radius: var(--radius);
  padding: 20px 24px;
  text-align: center;
  margin: 16px 0;
}

.equation {
  font-size: 18px; font-weight: 700;
  color: var(--text-primary);
  font-family: 'Courier New', monospace;
  letter-spacing: 1px;
}

.equation .eq-term { color: var(--accent-blue); }
.equation .eq-op   { color: var(--text-muted); margin: 0 8px; }

.equation-caption {
  margin-top: 8px;
  font-size: 11px; color: var(--text-muted);
}

/* ── Dataset Cards ───────────────────────────────────────── */
.dataset-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: all var(--transition);
}

.dataset-card:hover {
  border-color: var(--border-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.dataset-header {
  display: flex; align-items: flex-start; justify-content: space-between;
  margin-bottom: 16px;
}

.dataset-icon {
  width: 44px; height: 44px;
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 18px;
}

.dataset-stats {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 10px; margin-top: 16px;
}

.ds-stat {
  background: rgba(255,255,255,0.03);
  border-radius: 8px;
  padding: 10px;
}

.ds-stat-val { font-size: 16px; font-weight: 700; color: var(--text-primary); }
.ds-stat-lbl { font-size: 10px; color: var(--text-muted); margin-top: 2px; }

/* ── Progress Bars ───────────────────────────────────────── */
.progress-bar {
  height: 6px;
  background: rgba(255,255,255,0.08);
  border-radius: 3px;
  overflow: hidden;
  margin-top: 6px;
}

.progress-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 1s ease;
}

/* ── Tabs ────────────────────────────────────────────────── */
.tabs {
  display: flex; gap: 4px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.tab-btn {
  padding: 8px 16px;
  background: none; border: none;
  color: var(--text-muted);
  font-size: 12px; font-weight: 600;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
  font-family: var(--font);
}

.tab-btn:hover { color: var(--text-primary); }
.tab-btn.active { color: var(--accent-blue); border-bottom-color: var(--accent-blue); }

.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ── Expandable ──────────────────────────────────────────── */
.expandable {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 12px;
}

.expandable-header {
  padding: 12px 16px;
  background: rgba(255,255,255,0.03);
  cursor: pointer;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 13px; font-weight: 600;
  color: var(--text-primary);
  transition: background var(--transition);
}

.expandable-header:hover { background: rgba(255,255,255,0.05); }

.expandable-header i.toggle { transition: transform var(--transition); }
.expandable.open .expandable-header i.toggle { transform: rotate(180deg); }

.expandable-body {
  display: none;
  padding: 16px;
  font-size: 12px; color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid var(--border);
}

.expandable.open .expandable-body { display: block; }

/* ── Tooltip ─────────────────────────────────────────────── */
[data-tooltip] { position: relative; cursor: help; }

[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 6px);
  left: 50%; transform: translateX(-50%);
  background: #1e293b;
  border: 1px solid var(--border);
  color: var(--text-primary);
  font-size: 11px; font-weight: 400;
  padding: 6px 10px;
  border-radius: 6px;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition);
  z-index: 999;
}

[data-tooltip]:hover::after { opacity: 1; }

/* ── Scrollbar ───────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.2); }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main { margin-left: 0; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .hero h1 { font-size: 20px; }
}

/* ── Animations ──────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.page.active { animation: fadeIn 0.3s ease; }

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}

.loading { animation: pulse 1.5s infinite; }

/* ── Misc ────────────────────────────────────────────────── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 24px 0;
}

.text-accent-blue   { color: var(--accent-blue); }
.text-accent-cyan   { color: var(--accent-cyan); }
.text-accent-green  { color: var(--accent-green); }
.text-accent-orange { color: var(--accent-orange); }
.text-accent-red    { color: var(--accent-red); }
.text-muted         { color: var(--text-muted); }

.mb-4  { margin-bottom: 4px; }
.mb-8  { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }

.flex { display: flex; }
.flex-center { display: flex; align-items: center; }
.gap-8  { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }

.img-figure {
  width: 100%; border-radius: var(--radius);
  border: 1px solid var(--border);
  display: block;
}

.figure-caption {
  text-align: center;
  font-size: 11px; color: var(--text-muted);
  margin-top: 8px;
}