/* ============================================================
   :root — Design tokens
   ============================================================ */
:root {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-border: #30363d;
  --color-accent: #00d4a0;
  --color-accent-hover: #00e6b0;
  --color-accent-light: rgba(0, 212, 160, 0.08);
  --color-card-hover: #1c2128;
  --color-tag-bg: #21262d;
  --color-text-primary: #eef3f7;
  --color-text-secondary: #cbdae6;
  --color-positive: #3fb950;
  --color-negative: #f85149;
  --color-warning: #ffa657;
  --color-purple: #bc8cff;
  --color-strat-3sig: #79c0ff;
  --color-strat-6sig: #e3b341;
  --color-strat-9sig: #58a6ff;
  --color-strat-hfea: #f0883e;
  --color-strat-ftlt: #3fb950;
  --color-strat-grail: #bc8cff;
  --font-ui: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'SF Mono', 'Consolas', 'Liberation Mono', 'Courier New', monospace;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-ui);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  color: var(--color-accent-hover);
}

a:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

ul {
  list-style: none;
}

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

/* ============================================================
   Layout grid (sidebar + content)
   ============================================================ */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  padding: 8px 16px;
  background: var(--color-accent);
  color: var(--color-bg);
  font-weight: 600;
  font-size: 0.875rem;
  z-index: 1000;
  border-radius: 0 0 6px 0;
  transform: translateY(-100%);
  transition: transform 0.15s;
}

.skip-link:focus {
  transform: translateY(0);
}

.layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  align-items: start;
  min-height: 100vh;
}

.content-wrap {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 100vh;
}

main {
  flex: 1;
  max-width: 820px;
  padding: 32px 28px;
}

/* ============================================================
   Sidebar and top-bar nav
   ============================================================ */
.sidebar {
  width: 220px;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  padding: 24px 0 20px;
  flex-shrink: 0;
}

.sidebar-logo {
  padding: 0 20px 20px;
  border-bottom: 1px solid var(--color-border);
  margin-bottom: 8px;
}

.logo-text {
  display: block;
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.3px;
}

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

.site-label {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-top: 3px;
}

.sidebar-nav {
  flex: 1;
  padding: 8px 0;
}

.nav-link {
  display: block;
  padding: 7px 20px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color 0.15s;
  border-left: 3px solid transparent;
}

.nav-link:hover {
  color: var(--color-text-primary);
}

.nav-link.active {
  color: var(--color-accent);
  font-weight: 600;
  border-left-color: var(--color-accent);
}

.on-this-page {
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

.on-this-page-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  padding: 0 20px 6px;
  display: block;
}

.anchor-link {
  display: block;
  padding: 5px 20px 5px 28px;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  transition: color 0.15s;
  border-left: 3px solid transparent;
}

.anchor-link:hover {
  color: var(--color-text-primary);
}

.anchor-link.is-active {
  color: var(--color-accent);
}

.sidebar-disclaimer {
  padding: 16px 20px 0;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border);
  line-height: 1.5;
}

/* Top bar — mobile only, hidden on desktop */
.top-bar {
  display: none;
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(22, 27, 34, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.top-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
}

.nav-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.top-bar-nav {
  border-top: 1px solid var(--color-border);
  padding: 8px 0 12px;
}

.top-bar-nav .nav-link {
  border-left: none;
  padding: 9px 20px;
}

.top-bar-nav .nav-link.active {
  border-left: none;
  border-bottom: 2px solid var(--color-accent);
}

/* ============================================================
   Typography
   ============================================================ */
h1 {
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.3px;
  line-height: 1.2;
}

h2 {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  margin-top: 2.5rem;
}

h2::before {
  content: '';
  display: block;
  width: 3px;
  height: 1.1em;
  background: var(--color-accent);
  border-radius: 2px;
  flex-shrink: 0;
}

h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 0.5rem;
  margin-top: 1.5rem;
}

p {
  margin-bottom: 1rem;
}

p:last-child {
  margin-bottom: 0;
}

.lead {
  font-size: 1.0625rem;
  line-height: 1.65;
}

.caption {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
}

.num {
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.ticker {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-accent);
}

/* ============================================================
   Hero (badge, title, sub)
   ============================================================ */
.hero {
  margin-bottom: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-tag-bg);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 4px 12px;
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  margin-bottom: 14px;
}

.hero-badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.hero h1 {
  margin-bottom: 12px;
}

.hero .lead {
  color: var(--color-text-primary);
}

/* ============================================================
   Strategy cards (index)
   ============================================================ */
.strategies-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 1rem;
}

.strategy-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  transition: background 0.15s, transform 0.15s, box-shadow 0.15s;
}

.strategy-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  opacity: 0;
  transition: opacity 0.15s;
}

.strategy-card:hover {
  background: var(--color-card-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 18px rgba(0, 212, 160, 0.07);
}

.strategy-card:hover::before {
  opacity: 1;
}

.strat-3sig::before  { background: var(--color-strat-3sig); }
.strat-6sig::before  { background: var(--color-strat-6sig); }
.strat-9sig::before  { background: var(--color-strat-9sig); }
.strat-hfea::before  { background: var(--color-strat-hfea); }
.strat-ftlt::before  { background: var(--color-strat-ftlt); }
.strat-grail::before { background: var(--color-strat-grail); }

.card-body {
  flex: 1;
}

.card-title {
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--color-accent);
  margin-bottom: 8px;
  margin-top: 0;
}

.card-summary {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.55;
  margin-bottom: 0;
}

.card-footer {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
}

.card-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-accent);
}

.card-link:hover {
  color: var(--color-accent-hover);
}

/* ============================================================
   Placeholder blocks
   ============================================================ */
.placeholder {
  border: 1px dashed var(--color-border);
  border-radius: 8px;
  padding: 24px;
  color: var(--color-text-secondary);
  font-style: italic;
  text-align: center;
  font-size: 0.9rem;
}

/* ============================================================
   Tables
   ============================================================ */
.table-wrap {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

thead th {
  background: var(--color-card-hover);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-text-secondary);
  padding: 10px 14px;
  text-align: left;
}

tbody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.02);
}

tbody tr:hover {
  background: var(--color-accent-light);
}

td {
  padding: 10px 14px;
  color: var(--color-text-primary);
  border-top: 1px solid var(--color-border);
}

td.num {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

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

/* ============================================================
   Callout boxes (info, risk)
   ============================================================ */
.callout {
  border-radius: 0 6px 6px 0;
  padding: 14px 18px;
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
  line-height: 1.6;
}

.callout strong {
  display: block;
  margin-bottom: 4px;
  font-weight: 600;
}

.callout-info {
  background: var(--color-accent-light);
  border-left: 3px solid var(--color-accent);
  color: var(--color-text-primary);
}

.callout-risk {
  background: rgba(255, 166, 87, 0.08);
  border-left: 3px solid var(--color-warning);
  color: var(--color-text-primary);
}

/* ============================================================
   Badges and ticker tags
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 3px 10px;
  font-size: 0.75rem;
  font-weight: 500;
  border: 1px solid;
}

.badge-neutral {
  background: var(--color-tag-bg);
  color: var(--color-text-secondary);
  border-color: var(--color-border);
}

.badge-caution {
  background: rgba(255, 166, 87, 0.12);
  color: var(--color-warning);
  border-color: rgba(255, 166, 87, 0.3);
}

.badge-negative {
  background: rgba(248, 81, 73, 0.12);
  color: var(--color-negative);
  border-color: rgba(248, 81, 73, 0.3);
}

.badge-positive {
  background: rgba(63, 185, 80, 0.12);
  color: var(--color-positive);
  border-color: rgba(63, 185, 80, 0.3);
}

.ticker-tag {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-tag-bg);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 1px 7px;
  transition: background 0.15s, border-color 0.15s;
}

.ticker-tag:hover {
  background: var(--color-accent-light);
  border-color: var(--color-accent);
}

/* ============================================================
   Footer
   ============================================================ */
footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
  text-align: center;
  padding: 28px 32px;
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

footer p + p {
  margin-top: 6px;
}

footer a {
  color: var(--color-accent);
}

footer a:hover {
  color: var(--color-accent-hover);
}

/* ============================================================
   Media queries
   ============================================================ */
@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    display: none;
  }

  .top-bar {
    display: block;
  }

  main {
    padding: 24px 20px;
  }

  footer {
    padding: 20px;
  }
}

@media (max-width: 768px) {
  .strategies-grid {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 1.5rem;
  }

  h2 {
    font-size: 1.2rem;
  }

  main {
    padding: 20px;
  }

  .table-wrap {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* ============================================================
   Reduced motion
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .strategy-card,
  .strategy-card::before,
  .anchor-link,
  .skip-link {
    transition: none;
  }
}