/* ============================================================
   AKDITAL BOURSE — Design System & Global Styles
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  /* Colors — Base */
  --color-bg: #f4f5f7;
  --color-bg-alt: #ebedf0;
  --color-surface: #ffffff;
  --color-surface-hover: #fafbfc;
  --color-border: #dfe1e6;
  --color-border-light: #ebecf0;

  /* Colors — Text */
  --color-text: #172b4d;
  --color-text-secondary: #5e6c84;
  --color-text-muted: #97a0af;
  --color-text-inverse: #ffffff;

  /* Colors — Brand */
  --color-primary: #0052cc;
  --color-primary-dark: #003d99;
  --color-primary-light: #deebff;
  --color-accent: #0891b2;
  --color-accent-light: #e0f7fa;

  /* Colors — Semantic */
  --color-positive: #00875a;
  --color-positive-bg: #e3fcef;
  --color-negative: #de350b;
  --color-negative-bg: #ffebe6;
  --color-warning: #ff991f;
  --color-warning-bg: #fffae6;
  --color-info: #0065ff;
  --color-info-bg: #deebff;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.8125rem;
  --text-base: 0.9375rem;
  --text-lg: 1.125rem;
  --text-xl: 1.3125rem;
  --text-2xl: 1.625rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;

  --leading-tight: 1.25;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(23,43,77,0.04);
  --shadow-sm: 0 1px 3px rgba(23,43,77,0.06), 0 1px 2px rgba(23,43,77,0.04);
  --shadow-md: 0 4px 6px -1px rgba(23,43,77,0.06), 0 2px 4px -2px rgba(23,43,77,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(23,43,77,0.08), 0 4px 6px -4px rgba(23,43,77,0.04);
  --shadow-xl: 0 20px 25px -5px rgba(23,43,77,0.1), 0 8px 10px -6px rgba(23,43,77,0.04);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Layout */
  --container-max: 1200px;
  --sidebar-width: 320px;
  --header-height: 64px;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* Focus styles for accessibility */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.rounded-image {
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-6);
  box-shadow: var(--shadow-sm);
  width: 100%;
  object-fit: cover;
}

.preview-card-img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  margin: -var(--space-5) -var(--space-5) var(--space-4) -var(--space-5);
  width: calc(100% + var(--space-10));
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text);
  line-height: var(--leading-tight);
  font-weight: 700;
}

h1 { font-size: var(--text-3xl); margin-bottom: var(--space-6); }
h2 { font-size: var(--text-2xl); margin-bottom: var(--space-5); }
h3 { font-size: var(--text-xl); margin-bottom: var(--space-4); }
h4 { font-size: var(--text-lg); margin-bottom: var(--space-3); }

p { margin-bottom: var(--space-4); }

.text-sm { font-size: var(--text-sm); }
.text-xs { font-size: var(--text-xs); }
.text-lg { font-size: var(--text-lg); }
.text-muted { color: var(--color-text-secondary); }
.text-mono { font-family: var(--font-mono); }

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.page-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  padding: var(--space-8) 0;
}

@media (min-width: 1024px) {
  .page-layout {
    grid-template-columns: 1fr var(--sidebar-width);
  }
}

.page-content {
  min-width: 0;
}

.sidebar {
  display: none;
}

@media (min-width: 1024px) {
  .sidebar {
    display: block;
  }
}

/* --- Header / Navigation --- */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  box-shadow: var(--shadow-xs);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-lg);
  font-weight: 800;
  color: var(--color-text);
  text-decoration: none;
  letter-spacing: -0.025em;
}
.site-logo:hover { text-decoration: none; color: var(--color-text); }

.logo-icon {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 800;
  font-size: var(--text-sm);
}

.site-logo .logo-accent {
  color: var(--color-accent);
}

.header-independence {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 400;
  display: none;
}

@media (min-width: 768px) {
  .header-independence {
    display: inline;
    margin-left: var(--space-2);
  }
}

/* Main nav */
.main-nav {
  display: none;
}

@media (min-width: 900px) {
  .main-nav {
    display: flex;
    gap: var(--space-1);
    align-items: center;
  }
}

.main-nav a {
  padding: var(--space-2) var(--space-3);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.main-nav a:hover,
.main-nav a.active {
  color: var(--color-primary);
  background: var(--color-primary-light);
  text-decoration: none;
}

/* Mobile menu */
.mobile-menu-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: none;
  color: var(--color-text);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
}
.mobile-menu-btn:hover {
  background: var(--color-bg-alt);
}

@media (min-width: 900px) {
  .mobile-menu-btn { display: none; }
}

.mobile-nav {
  display: none;
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-surface);
  z-index: 99;
  padding: var(--space-6);
  overflow-y: auto;
  animation: slideDown 0.2s ease;
}
.mobile-nav.open { display: block; }

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

.mobile-nav a {
  display: block;
  padding: var(--space-3) var(--space-4);
  color: var(--color-text);
  font-size: var(--text-base);
  font-weight: 500;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-1);
}
.mobile-nav a:hover,
.mobile-nav a.active {
  background: var(--color-primary-light);
  color: var(--color-primary);
  text-decoration: none;
}

/* --- Breadcrumb --- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  padding: var(--space-4) 0;
  flex-wrap: wrap;
}
.breadcrumb a {
  color: var(--color-text-secondary);
}
.breadcrumb-separator {
  color: var(--color-text-muted);
  user-select: none;
}
.breadcrumb-current {
  color: var(--color-text);
  font-weight: 500;
}

/* --- Cards --- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}
.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-5);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid var(--color-border-light);
}

.card-title {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: 0;
}

.card-link {
  font-size: var(--text-sm);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

/* --- Quote Block (Stock price) --- */
.quote-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-8);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--space-8);
}

.quote-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.quote-company {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.quote-ticker {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  background: var(--color-primary-light);
  color: var(--color-primary);
  font-weight: 700;
  font-size: var(--text-sm);
  border-radius: var(--radius-full);
}

.quote-market {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.quote-price-row {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-4);
}

.quote-price {
  font-family: var(--font-mono);
  font-size: var(--text-4xl);
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -0.03em;
  line-height: 1;
}

.quote-currency {
  font-size: var(--text-lg);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.quote-change {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--text-base);
}

.quote-change.positive {
  background: var(--color-positive-bg);
  color: var(--color-positive);
}
.quote-change.negative {
  background: var(--color-negative-bg);
  color: var(--color-negative);
}
.quote-change.neutral {
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
}

.quote-meta {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}

.quote-details {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3) var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-border-light);
}

@media (min-width: 640px) {
  .quote-details {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .quote-details {
    grid-template-columns: repeat(6, 1fr);
  }
}

.quote-detail-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.quote-detail-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.quote-detail-value {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: var(--text-base);
}

/* --- Tables --- */
.table-wrapper {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-light);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

thead {
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 1;
}

th {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-weight: 600;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}

th.text-right, td.text-right {
  text-align: right;
}

td {
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border-light);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  white-space: nowrap;
}

tr:hover td {
  background: var(--color-surface-hover);
}

td.positive { color: var(--color-positive); }
td.negative { color: var(--color-negative); }

/* --- Chart --- */
.chart-container {
  position: relative;
  width: 100%;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
}

.chart-controls {
  display: flex;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
}

.chart-period-btn {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}

.chart-period-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.chart-period-btn.active {
  background: var(--color-primary);
  color: white;
  border-color: var(--color-primary);
}

.chart-canvas-wrapper {
  position: relative;
  width: 100%;
  height: 360px;
}

.chart-canvas-wrapper canvas {
  width: 100% !important;
  height: 100% !important;
}

.chart-tooltip {
  position: absolute;
  pointer-events: none;
  background: var(--color-text);
  color: white;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-family: var(--font-mono);
  white-space: nowrap;
  z-index: 10;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

/* --- Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.badge-positive {
  background: var(--color-positive-bg);
  color: var(--color-positive);
}
.badge-negative {
  background: var(--color-negative-bg);
  color: var(--color-negative);
}
.badge-info {
  background: var(--color-info-bg);
  color: var(--color-info);
}
.badge-warning {
  background: var(--color-warning-bg);
  color: var(--color-warning);
}
.badge-neutral {
  background: var(--color-bg-alt);
  color: var(--color-text-secondary);
}

/* --- Sections --- */
.section {
  margin-bottom: var(--space-8);
}

.section-title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.section-title-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: var(--radius-sm);
  font-size: var(--text-base);
  flex-shrink: 0;
}

/* --- Grid layouts --- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 640px) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
}

.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

@media (min-width: 768px) {
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* --- Stat cards --- */
.stat-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  transition: box-shadow var(--transition-base);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
}

.stat-label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-2);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
}

.stat-sub {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

/* --- FAQ Accordion --- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.faq-item {
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition-base);
}

.faq-item:hover {
  box-shadow: var(--shadow-sm);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  background: var(--color-surface);
  border: none;
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  text-align: left;
  gap: var(--space-4);
}

.faq-question:hover {
  background: var(--color-surface-hover);
}

.faq-icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  transition: transform var(--transition-base);
  color: var(--color-text-muted);
}

.faq-item.open .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.faq-item.open .faq-answer {
  max-height: 500px;
}

.faq-answer-inner {
  padding: 0 var(--space-5) var(--space-5);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: white;
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  color: white;
  text-decoration: none;
}

.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary-light);
  text-decoration: none;
}

.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
}

/* --- Notice / Disclaimer --- */
.notice {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
}

.notice-info {
  background: var(--color-info-bg);
  color: var(--color-primary-dark);
  border: 1px solid #b3d4ff;
}

.notice-warning {
  background: var(--color-warning-bg);
  color: #97570a;
  border: 1px solid #ffe380;
}

.notice-icon {
  flex-shrink: 0;
  font-size: var(--text-lg);
}

/* --- Footer --- */
.site-footer {
  background: var(--color-text);
  color: rgba(255,255,255,0.7);
  padding: var(--space-16) 0 var(--space-8);
  margin-top: var(--space-16);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  margin-bottom: var(--space-10);
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer-brand {
  max-width: 320px;
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-lg);
  font-weight: 800;
  color: white;
  margin-bottom: var(--space-4);
}

.footer-desc {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  color: rgba(255,255,255,0.5);
}

.footer-heading {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: rgba(255,255,255,0.4);
  margin-bottom: var(--space-4);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  color: rgba(255,255,255,0.7);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}
.footer-links a:hover {
  color: white;
  text-decoration: none;
}

.footer-bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-bottom p {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.4);
  margin-bottom: 0;
}

.footer-disclaimer {
  font-size: var(--text-xs);
  color: rgba(255,255,255,0.35);
  line-height: var(--leading-relaxed);
  max-width: 700px;
  margin-top: var(--space-4);
  text-align: center;
}

@media (min-width: 768px) {
  .footer-disclaimer { text-align: left; }
}

/* --- Preview/Teaser cards --- */
.preview-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  transition: all var(--transition-base);
}

.preview-card:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.preview-card-title {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: 0;
}

.preview-card-title a {
  color: var(--color-text);
}

.preview-card-title a:hover {
  color: var(--color-primary);
  text-decoration: none;
}

.preview-card-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: 0;
}

/* --- TOC (table of contents) --- */
.toc {
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  margin-bottom: var(--space-6);
}

.toc-title {
  font-size: var(--text-sm);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.toc-list a {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.toc-list a:hover {
  color: var(--color-primary);
}

/* --- Forms / Inputs for tools --- */
.form-group {
  margin-bottom: var(--space-5);
}

.form-label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.form-input {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-text);
  background: var(--color-surface);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(0,82,204,0.15);
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

.form-result {
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  margin-top: var(--space-4);
}

/* --- Utility --- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border-width: 0;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

/* --- Page title banner --- */
.page-hero {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, var(--color-accent) 100%);
  color: white;
  padding: var(--space-10) 0;
  margin-bottom: var(--space-8);
}

.page-hero h1 {
  color: white;
  margin-bottom: var(--space-3);
}

.page-hero p {
  color: rgba(255,255,255,0.85);
  font-size: var(--text-lg);
  max-width: 700px;
  margin-bottom: 0;
}

/* --- Glossary --- */
.glossary-letter {
  font-size: var(--text-2xl);
  font-weight: 800;
  color: var(--color-primary);
  padding: var(--space-4) 0 var(--space-2);
  border-bottom: 2px solid var(--color-primary-light);
  margin-bottom: var(--space-4);
}

.glossary-term {
  margin-bottom: var(--space-5);
}

.glossary-term dt {
  font-weight: 700;
  font-size: var(--text-base);
  margin-bottom: var(--space-1);
}

.glossary-term dd {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  margin-left: 0;
}

/* --- Calendar/Timeline --- */
.timeline {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  padding-left: var(--space-8);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--color-border);
}

.timeline-item {
  position: relative;
  padding-bottom: var(--space-6);
}

.timeline-dot {
  position: absolute;
  left: calc(-1 * var(--space-8) + 6px);
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-surface);
  box-shadow: 0 0 0 2px var(--color-primary-light);
}

.timeline-date {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.timeline-title {
  font-weight: 700;
  margin-bottom: var(--space-1);
}

.timeline-desc {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* --- Tabs --- */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 2px solid var(--color-border);
  margin-bottom: var(--space-6);
  overflow-x: auto;
}

.tab-btn {
  padding: var(--space-3) var(--space-5);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--transition-fast);
}

.tab-btn:hover {
  color: var(--color-primary);
}

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

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

/* --- Print --- */
@media print {
  .site-header, .mobile-nav, .site-footer, .chart-controls { display: none; }
  body { background: white; }
  .card, .quote-block { box-shadow: none; border: 1px solid #ddd; }
}