/* Base styles — Binance dark canvas */
* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-canvas);
  color: var(--color-body);
  font-family: var(--font-body);
  font-size: var(--fs-body-md);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

a { color: var(--color-primary); text-decoration: none; }
a:hover { color: var(--color-primary-active); }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-on-dark);
  margin: 0 0 var(--sp-md);
  line-height: 1.15;
  letter-spacing: -0.3px;
}
h1 { font-size: var(--fs-hero-display); font-weight: 700; letter-spacing: -1px; }
h2 { font-size: var(--fs-display-md); font-weight: 600; }
h3 { font-size: var(--fs-title-lg); font-weight: 600; }
h4 { font-size: var(--fs-title-md); font-weight: 600; }

p { margin: 0 0 var(--sp-md); }

ul, ol { margin: 0 0 var(--sp-md); padding-left: 1.25rem; }

code, pre, .num {
  font-family: var(--font-number);
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--sp-lg);
}

.section { padding: var(--sp-section) 0; }

/* Top nav */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 14, 17, 0.92);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid var(--color-hairline-on-dark);
}
.top-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--sp-lg);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-xs);
  color: var(--color-primary);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.3px;
  text-decoration: none;
}
.brand:hover { color: var(--color-primary-active); }
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-xl);
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  color: var(--color-body);
  font-size: var(--fs-nav);
  font-weight: 500;
  padding: 8px 4px;
}
.nav-links a:hover { color: var(--color-on-dark); }
.nav-links a.active { color: var(--color-primary); }

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--color-hairline-on-dark);
  color: var(--color-on-dark);
  padding: 8px 12px;
  border-radius: var(--rad-md);
  cursor: pointer;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-xs);
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-button);
  line-height: 1;
  height: 40px;
  padding: 0 var(--sp-lg);
  border: 0;
  border-radius: var(--rad-md);
  text-decoration: none;
  transition: background var(--motion-fast) var(--easing-standard);
  cursor: pointer;
}
.btn-primary:hover { background: var(--color-primary-active); color: var(--color-on-primary); }

.btn-primary-pill {
  height: 48px;
  padding: 0 var(--sp-xl);
  border-radius: var(--rad-pill);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-xs);
  background: var(--color-surface-card);
  color: var(--color-on-dark);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-button);
  height: 40px;
  padding: 0 var(--sp-lg);
  border: 0;
  border-radius: var(--rad-md);
  text-decoration: none;
  transition: background var(--motion-fast) var(--easing-standard);
  cursor: pointer;
}
.btn-secondary:hover { background: var(--color-surface-elevated); }

/* Pill modifier — matches .btn-primary-pill geometry so paired CTAs align */
.btn-secondary-pill {
  height: 48px;
  padding: 0 var(--sp-xl);
  border-radius: var(--rad-pill);
  border: 1px solid var(--color-hairline-on-dark);
}
.btn-secondary-pill:hover { background: var(--color-surface-elevated); }

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-xs);
  color: var(--color-body);
  font-size: var(--fs-button);
  font-weight: 500;
  padding: 8px 12px;
  border-radius: var(--rad-md);
  text-decoration: none;
}
.btn-ghost:hover { color: var(--color-on-dark); }

/* Cards */
.card {
  background: var(--color-surface-card);
  border-radius: var(--rad-xl);
  padding: var(--sp-lg);
  border: 1px solid var(--color-hairline-on-dark);
}
.card-elevated {
  background: var(--color-surface-elevated);
}

/* Stat / hero */
.eyebrow {
  display: inline-block;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-caption);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--sp-md);
}
.lead {
  color: var(--color-muted-strong);
  font-size: var(--fs-title-md);
  line-height: 1.5;
  max-width: 56ch;
}

/* Grid */
.grid {
  display: grid;
  gap: var(--sp-lg);
}
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-auto-220 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.grid-auto-280 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* Muted / body helpers */
.muted { color: var(--color-muted); }
.muted-strong { color: var(--color-muted-strong); }
.small { font-size: var(--fs-body-sm); }
.center { text-align: center; }

/* Tags / chips */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: var(--rad-pill);
  font-size: var(--fs-caption);
  font-weight: 600;
  letter-spacing: 0.04em;
  background: rgba(252, 213, 53, 0.12);
  color: var(--color-primary);
  border: 1px solid rgba(252, 213, 53, 0.32);
}
.chip-muted {
  background: var(--color-surface-elevated);
  color: var(--color-muted-strong);
  border-color: var(--color-hairline-on-dark);
}

/* Curation filter tabs */
.tabbar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-sm);
  margin-bottom: var(--sp-xl);
}
.tab {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-xs);
  padding: 8px 14px;
  border-radius: var(--rad-pill);
  font-family: var(--font-display);
  font-size: var(--fs-body-sm);
  font-weight: 600;
  letter-spacing: 0.02em;
  background: var(--color-surface-elevated);
  color: var(--color-muted-strong);
  border: 1px solid var(--color-hairline-on-dark);
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--motion-fast) var(--easing-standard),
              color var(--motion-fast) var(--easing-standard),
              border-color var(--motion-fast) var(--easing-standard);
}
.tab:hover { color: var(--color-on-dark); }
.tab.active {
  background: rgba(252, 213, 53, 0.12);
  color: var(--color-primary);
  border-color: rgba(252, 213, 53, 0.32);
}
.tab .count { opacity: 0.7; font-weight: 500; }
.tab.active .count { opacity: 0.85; }

@media (max-width: 768px) {
  .tabbar {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    margin-left: calc(var(--sp-lg) * -1);
    margin-right: calc(var(--sp-lg) * -1);
    padding: 0 var(--sp-lg) 4px;
  }
  .tabbar::-webkit-scrollbar { display: none; }
}

/* Footer (light, per DESIGN.md) */
.footer {
  background: var(--color-surface-soft-light);
  color: var(--color-body-on-light);
  padding: 64px var(--sp-lg);
  border-top: 1px solid var(--color-hairline-on-light);
}
.footer-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--sp-xl);
}
.footer h5 {
  font-size: var(--fs-title-sm);
  color: var(--color-ink);
  margin: 0 0 var(--sp-md);
}
.footer ul { list-style: none; margin: 0; padding: 0; }
.footer li { margin-bottom: 8px; }
.footer a {
  color: var(--color-muted);
  font-size: var(--fs-body-md);
}
.footer a:hover { color: var(--color-ink); }
.footer .brand-block .brand { color: var(--color-ink); }
.footer .copy {
  margin-top: var(--sp-xl);
  padding-top: var(--sp-md);
  border-top: 1px solid var(--color-hairline-on-light);
  font-size: var(--fs-body-sm);
  color: var(--color-muted);
}

/* Forms */
input[type="search"], input[type="text"], input[type="email"] {
  background: var(--color-surface-card);
  color: var(--color-on-dark);
  border: 1px solid var(--color-hairline-on-dark);
  border-radius: var(--rad-lg);
  height: 40px;
  padding: 0 var(--sp-md);
  font-family: var(--font-body);
  font-size: var(--fs-body-md);
  outline: none;
}
input:focus { box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.4); border-color: var(--color-info); }

/* AdSense slot placeholder */
.ad-slot {
  display: block;
  width: 100%;
  margin: var(--sp-xl) auto;
  min-height: 90px;
  border-radius: var(--rad-lg);
  border: 1px dashed var(--color-hairline-on-dark);
  background: var(--color-surface-card);
  color: var(--color-muted);
  font-size: var(--fs-caption);
  display: flex;
  align-items: center;
  justify-content: center;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* Scroll reveal animations
   Activated only when <html> has .has-reveal (set by inline head script).
   Excluded automatically on blog detail pages (no_reveal flag). */
html.has-reveal main .section > .container > h1,
html.has-reveal main .section > .container > h2,
html.has-reveal main .section > .container > h3,
html.has-reveal main .section > .container > h4,
html.has-reveal main .section > .container > .eyebrow,
html.has-reveal main .section > .container > .lead,
html.has-reveal main .section > .container > p,
html.has-reveal main .section > .container > div,
html.has-reveal main .section > .container > .card,
html.has-reveal main .grid > *,
html.has-reveal main > .ad-slot,
html.has-reveal main .section > .container > .ad-slot {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms cubic-bezier(0.2, 0.7, 0.2, 1),
              transform 700ms cubic-bezier(0.2, 0.7, 0.2, 1);
  will-change: opacity, transform;
}
html.has-reveal .reveal-in {
  opacity: 1 !important;
  transform: none !important;
}
/* Stagger grid children */
html.has-reveal main .grid > *:nth-child(2) { transition-delay: 80ms; }
html.has-reveal main .grid > *:nth-child(3) { transition-delay: 160ms; }
html.has-reveal main .grid > *:nth-child(4) { transition-delay: 240ms; }
html.has-reveal main .grid > *:nth-child(5) { transition-delay: 320ms; }
html.has-reveal main .grid > *:nth-child(6) { transition-delay: 400ms; }

@media (prefers-reduced-motion: reduce) {
  html.has-reveal main .section > .container > h1,
  html.has-reveal main .section > .container > h2,
  html.has-reveal main .section > .container > h3,
  html.has-reveal main .section > .container > h4,
  html.has-reveal main .section > .container > .eyebrow,
  html.has-reveal main .section > .container > .lead,
  html.has-reveal main .section > .container > p,
  html.has-reveal main .section > .container > div,
  html.has-reveal main .section > .container > .card,
  html.has-reveal main .grid > *,
  html.has-reveal main > .ad-slot,
  html.has-reveal main .section > .container > .ad-slot {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* Responsive */
@media (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
  :root {
    --fs-hero-display: 40px;
    --fs-display-lg: 32px;
    --fs-display-md: 28px;
    --fs-display-sm: 24px;
    --sp-section: 56px;
  }
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-canvas);
    border-bottom: 1px solid var(--color-hairline-on-dark);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--sp-md) var(--sp-lg);
  }
  .nav-links.open li { padding: 12px 0; border-bottom: 1px solid var(--color-hairline-on-dark); }
  .nav-links.open li:last-child { border-bottom: 0; }
  .nav-toggle { display: inline-flex; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
}