/* ===== FOUNDATIONS ===== */
:root {
  --font-ui: "Plus Jakarta Sans", "Manrope", "SF Pro Text", "SF Pro Display", -apple-system, BlinkMacSystemFont, "Roboto", "Noto Sans", "Ubuntu", "Cantarell", "Helvetica Neue", Arial, sans-serif;
  --layout-top-pad: 32px;
  --layout-content-x: 48px;
  --sidebar-gutter: 12px;
  --sidebar-icon-hit: 40px;
  --sidebar-item-gap: 9px;
  --sidebar-stack-offset: 4px;
  --bg-body: #0c0e14;
  --bg-sidebar: #111318;
  --bg-card: rgba(22, 27, 38, 0.85);
  --bg-card-hover: rgba(30, 37, 52, 0.9);
  --border-subtle: rgba(255, 255, 255, 0.06);
  --text-primary: #f0f2f5;
  --text-secondary: #8b95a8;
  --text-muted: #555e6e;
  --accent-blue: #4f8ff7;
  --accent-green: #34d399;
  --accent-purple: #a78bfa;
  --accent-amber: #fbbf24;
  --accent-red: #f87171;
  --accent-cyan: #22d3ee;
  --accent-pink: #f472b6;
  --sidebar-width: 250px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 22px;
  --shadow-card: 0 4px 30px rgba(0, 0, 0, 0.35);
  --shadow-glow-blue: 0 0 20px rgba(79, 143, 247, 0.15);
}

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

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

/* ===== SIDEBAR ===== */
.sidebar {
  position: fixed;
  left: 0; top: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  z-index: 100;
  padding: var(--layout-top-pad) 0 12px;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

.sidebar.collapsed {
  width: 68px;
}

.sidebar.collapsed .sidebar-text {
  opacity: 0;
  width: 0;
  overflow: hidden;
  white-space: nowrap;
  pointer-events: none;
}

.sidebar.collapsed .sidebar-toggle svg {
  transform: translateX(-1px) rotate(180deg);
}

.sidebar.collapsed .sidebar-top {
  justify-content: center;
  padding: 0;
  margin-bottom: var(--sidebar-item-gap);
}

.sidebar.collapsed .nav-link {
  width: var(--sidebar-icon-hit);
  height: var(--sidebar-icon-hit);
  min-height: var(--sidebar-icon-hit);
  justify-content: center;
  padding: 0;
  border-left: none;
}

.sidebar.collapsed .nav-icon {
  font-size: 1.2rem;
}

.sidebar.collapsed .sidebar-brand {
  width: var(--sidebar-icon-hit);
  min-width: var(--sidebar-icon-hit);
  justify-content: center;
}

.sidebar.collapsed .nav-links {
  align-items: center;
  gap: var(--sidebar-item-gap);
  padding: var(--sidebar-stack-offset) 0 0;
}

.sidebar.collapsed .nav-collapse {
  display: flex;
  justify-content: center;
  margin-top: 6px;
}

.sidebar.collapsed .nav-collapse .sidebar-toggle {
  width: var(--sidebar-icon-hit);
  height: var(--sidebar-icon-hit);
  min-width: var(--sidebar-icon-hit);
  justify-content: center;
  padding: 0;
}

.sidebar.collapsed .sidebar-footer {
  opacity: 0;
  pointer-events: none;
  height: 0;
  padding: 0;
  overflow: hidden;
}

.sidebar-top {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 0 var(--sidebar-gutter);
  margin-bottom: 12px;
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.sidebar-text {
  transition: opacity 0.2s ease, width 0.2s ease;
  white-space: nowrap;
}

.brand-icon {
  font-size: 1.5rem;
  width: var(--sidebar-icon-hit);
  height: var(--sidebar-icon-hit);
  min-width: var(--sidebar-icon-hit);
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
  border-radius: var(--radius-sm);
}

.sidebar-brand span {
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.2;
  letter-spacing: -0.3px;
}

.sidebar-toggle {
  background: none;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  width: 100%;
  min-height: var(--sidebar-icon-hit);
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
  padding: 0 12px;
  line-height: 0;
  transition: all 0.2s ease;
}

.sidebar-toggle:hover {
  background: rgba(79, 143, 247, 0.06);
  color: var(--text-primary);
  border-color: rgba(79, 143, 247, 0.3);
}

.sidebar-toggle:focus-visible {
  outline: 2px solid var(--accent-blue);
  outline-offset: 2px;
}

.sidebar-toggle svg {
  display: block;
  transform: translateX(-1px);
  transition: transform 0.3s ease;
}

.nav-links {
  list-style: none;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: var(--sidebar-stack-offset) var(--sidebar-gutter) 0;
}

.nav-collapse {
  list-style: none;
  margin-top: 6px;
}

.nav-section-label {
  padding: 10px 10px 2px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  opacity: 0.9;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: var(--sidebar-icon-hit);
  padding: 9px 12px;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.9rem;
  transition: all 0.2s ease;
  border-left: 3px solid transparent;
  border-radius: var(--radius-sm);
}

.nav-link:hover {
  color: var(--text-primary);
  background: rgba(79, 143, 247, 0.06);
  border-left-color: rgba(79, 143, 247, 0.28);
}

.nav-link.active {
  color: var(--accent-blue);
  background: linear-gradient(90deg, rgba(79, 143, 247, 0.18), rgba(79, 143, 247, 0.08));
  border-left-color: var(--accent-blue);
  box-shadow: inset 0 0 0 1px rgba(79, 143, 247, 0.18);
}

.nav-icon {
  font-size: 1.15rem;
  width: 22px;
  text-align: center;
  transition: transform 0.2s ease, filter 0.2s ease;
}

.nav-link:hover .nav-icon {
  transform: translateX(1px);
}

.nav-link.active .nav-icon {
  transform: scale(1.08);
  filter: drop-shadow(0 0 6px rgba(79, 143, 247, 0.35));
}

.sidebar-footer {
  margin-top: auto;
  padding: 14px 20px;
  border-top: 1px solid var(--border-subtle);
  background: linear-gradient(180deg, rgba(79, 143, 247, 0), rgba(79, 143, 247, 0.03));
}

.sidebar-footer p {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.sidebar-footer .term-range {
  color: var(--accent-blue);
  font-weight: 600;
  margin-top: 4px;
}

/* ===== MAIN CONTENT ===== */
.main-content {
  margin-left: var(--sidebar-width);
  padding: var(--layout-top-pad) var(--layout-content-x) 40px;
  min-height: 100vh;
  transition: margin-left 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar.collapsed ~ .main-content {
  margin-left: 68px;
}

.page { display: none; }
.page.active { display: block; animation: fadeIn 0.35s ease; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-header {
  margin-bottom: 36px;
}

.page-header h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.page-header .subtitle {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-top: 6px;
}

/* ===== KPI CARDS ===== */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 18px;
  margin-bottom: 36px;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  transition: transform 0.2s, box-shadow 0.2s;
}

.kpi-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow-blue);
}

.kpi-card .kpi-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  font-weight: 600;
  margin-bottom: 10px;
}

.kpi-card .kpi-value {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -1px;
}

.kpi-card .kpi-sub {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-top: 4px;
}

.kpi-card.red .kpi-value { color: var(--accent-red); }
.kpi-card.green .kpi-value { color: var(--accent-green); }
.kpi-card.blue .kpi-value { color: var(--accent-blue); }
.kpi-card.amber .kpi-value { color: var(--accent-amber); }
.kpi-card.purple .kpi-value { color: var(--accent-purple); }
.kpi-card.cyan .kpi-value { color: var(--accent-cyan); }

/* ===== CHART CARDS ===== */
.charts-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 24px;
  margin-bottom: 30px;
}

.chart-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-card);
}

.chart-card.full-width {
  grid-column: 1 / -1;
}

.chart-card h2 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
  letter-spacing: -0.3px;
}

.chart-container {
  position: relative;
  height: 350px;
}

.chart-container.tall {
  height: 500px;
}

/* ===== DATA TABLES ===== */
.data-table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.88rem;
}

.data-table thead th {
  background: rgba(79, 143, 247, 0.08);
  color: var(--accent-blue);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 1px;
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
  position: sticky;
  top: 0;
}

.data-table thead th:first-child { border-radius: var(--radius-sm) 0 0 0; }
.data-table thead th:last-child { border-radius: 0 var(--radius-sm) 0 0; }

.data-table tbody tr {
  transition: background 0.15s;
}

.data-table tbody tr:hover {
  background: rgba(79, 143, 247, 0.04);
}

.data-table tbody td {
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-secondary);
}

.ga-comparison-table-wrapper,
.hack-table-wrapper,
.difficulty-table-wrapper {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-card);
  margin-bottom: 30px;
  overflow-x: auto;
}

.hack-table-wrapper h2,
.difficulty-table-wrapper h2 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 20px;
}

/* ===== GA SELECTOR BUTTONS ===== */
.ga-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 30px;
}

.ga-btn {
  padding: 8px 20px;
  border-radius: 50px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.2s;
}

.ga-btn:hover {
  background: var(--bg-card-hover);
  color: var(--text-primary);
}

.ga-btn.active {
  background: var(--accent-blue);
  color: #fff;
  border-color: var(--accent-blue);
  box-shadow: 0 0 14px rgba(79, 143, 247, 0.3);
}

/* ===== ROE CARDS ===== */
.roe-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
  margin-bottom: 36px;
}

.roe-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}

.roe-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-red), var(--accent-amber));
}

.roe-card .roe-term {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  font-weight: 700;
}

.roe-card .roe-avg {
  font-size: 2rem;
  font-weight: 800;
  margin: 10px 0 4px;
}

.roe-card .roe-honest {
  font-size: 0.88rem;
  color: var(--accent-green);
}

.roe-card .roe-hack {
  font-size: 0.82rem;
  color: var(--accent-red);
  margin-top: 8px;
}

/* ===== HACK SUMMARY ===== */
.hack-summary-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
  margin-bottom: 36px;
}

.hack-stat {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px 24px;
  text-align: center;
  box-shadow: var(--shadow-card);
}

.hack-stat .hack-number {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--accent-red);
}

.hack-stat .hack-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-top: 6px;
}

/* ===== DIFFICULTY BADGES ===== */
.badge {
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-brutal { background: rgba(248, 113, 113, 0.15); color: var(--accent-red); }
.badge-hard { background: rgba(251, 191, 36, 0.15); color: var(--accent-amber); }
.badge-medium { background: rgba(79, 143, 247, 0.15); color: var(--accent-blue); }
.badge-easy { background: rgba(52, 211, 153, 0.15); color: var(--accent-green); }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .sidebar { width: 68px; }
  .sidebar .sidebar-text { opacity: 0; width: 0; overflow: hidden; }
  .sidebar .nav-collapse { display: none; }
  .sidebar .sidebar-top {
    justify-content: center;
    padding: 0;
    margin-bottom: var(--sidebar-item-gap);
  }
  .sidebar .sidebar-brand {
    justify-content: center;
    width: var(--sidebar-icon-hit);
    min-width: var(--sidebar-icon-hit);
  }
  .sidebar .nav-links {
    align-items: center;
    gap: 8px;
    padding: 0;
  }
  .sidebar .nav-section-label { display: none; }
  .sidebar .nav-link {
    width: var(--sidebar-icon-hit);
    height: var(--sidebar-icon-hit);
    min-height: var(--sidebar-icon-hit);
    justify-content: center;
    padding: 0;
    border-left: none;
  }
  .main-content { margin-left: 68px; padding: var(--layout-top-pad) 24px 24px; }
  .charts-row { grid-template-columns: 1fr; }
}

/* ===== FILTER ROW ===== */
.filter-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  margin-bottom: 30px;
}

.filter-row .ga-selector {
  flex: 1;
  margin-bottom: 0;
}

.term-filter {
  display: flex;
  align-items: center;
  gap: 10px;
}

.term-filter label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  white-space: nowrap;
}

.term-select {
  font-family: var(--font-ui);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 50px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
  color: var(--text-primary);
  cursor: pointer;
  outline: none;
  appearance: none;
  -webkit-appearance: none;
  transition: all 0.2s;
}

.term-select:hover {
  border-color: var(--accent-blue);
}

.term-select:focus {
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(79, 143, 247, 0.15);
}

.term-select option {
  background: var(--bg-sidebar);
  color: var(--text-primary);
}

/* ===== INSIGHT CARDS ===== */
.ga-insights, .roe-insights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.insight-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  box-shadow: var(--shadow-card);
  border-left: 4px solid var(--accent-blue);
  transition: transform 0.2s;
}

.insight-card:hover {
  transform: translateY(-3px);
}

.insight-card.brutal { border-left-color: var(--accent-red); }
.insight-card.warning { border-left-color: var(--accent-amber); }
.insight-card.success { border-left-color: var(--accent-green); }
.insight-card.info { border-left-color: var(--accent-cyan); }
.insight-card.hack { border-left-color: var(--accent-pink); }

.insight-card .insight-icon {
  font-size: 1.4rem;
  margin-bottom: 8px;
}

.insight-card .insight-title {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.insight-card .insight-body {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ===== METHODOLOGY NOTE ===== */
.methodology-note {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: rgba(79, 143, 247, 0.04);
  border: 1px solid rgba(79, 143, 247, 0.12);
  border-radius: var(--radius-md);
  padding: 22px 26px;
  margin-top: 30px;
}

.methodology-note .methodology-icon {
  font-size: 1.5rem;
  min-width: 32px;
  margin-top: 2px;
}

.methodology-note .methodology-title {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--accent-blue);
  margin-bottom: 8px;
}

.methodology-note p {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin: 0;
}

.methodology-note code {
  background: rgba(79, 143, 247, 0.1);
  color: var(--accent-cyan);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.82rem;
  font-family: 'Fira Code', 'Consolas', monospace;
}