/* =========================================================
   BITBANK — design tokens
   Clean, light, single theme.
   ========================================================= */

:root{
  --font-display: 'Space Grotesk', sans-serif;
  --font-stamp: 'Big Shoulders Stencil', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --radius: 14px;
  --wrap: 1120px;

  --dur: 480ms;
  --ease: cubic-bezier(.65,0,.35,1);

  --bg: #FFFFFF;
  --bg-alt: #F7F4EC;
  --surface: #FBFAF6;
  --surface-2: #FFFFFF;
  --border: #E6E0D0;
  --text: #17160F;
  --text-dim: #6B6558;
  --accent: #2F6FB0;
  --accent-hi: #4A90D9;
  --accent-text: #FFFFFF;
  --stamp-red: #E0472A;
  --ledger-green: #2F7A52;
  --btn-radius: 10px;
  --btn-font: var(--font-display);
  --shadow: 0 1px 0 rgba(255,255,255,.6) inset, 0 14px 30px -18px rgba(23,22,15,.25);
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  line-height: 1.5;
  overflow-x: hidden;
}
img{ max-width:100%; display:block; }
a{ color: inherit; text-decoration: none; }
.wrap{ max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }
.mono{ font-family: var(--font-mono); }

@media (prefers-reduced-motion: reduce){
  *{ animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
}

/* faint warm wash */
.grain{
  position: fixed; inset: 0; pointer-events: none; z-index: 1;
  background-image:
    radial-gradient(circle at 15% 10%, rgba(47,111,176,.05), transparent 40%),
    radial-gradient(circle at 85% 55%, rgba(47,122,82,.04), transparent 45%);
}

/* =========================================================
   HEADER
   ========================================================= */
.site-header{
  position: sticky; top:0; z-index: 40;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner{
  display:flex; align-items:center; justify-content:space-between;
  height: 72px; gap: 24px;
}
.logo{ display:flex; align-items:center; gap:10px; flex-shrink:0; }
.logo-mark{
  width: 34px; height:34px; border-radius: 8px;
  display:flex; align-items:center; justify-content:center;
  font-family: var(--font-display); font-weight:700; font-size: 18px;
  background: linear-gradient(160deg, var(--accent-hi), var(--accent));
  color: var(--accent-text);
  box-shadow: var(--shadow);
}
.logo-word{
  font-family: var(--font-display); font-weight:700; font-size: 19px; letter-spacing:-.01em;
}

.site-nav{ display:flex; gap: 28px; }
.site-nav a{
  font-size: 14.5px; font-weight:500; color: var(--text-dim);
  transition: color .2s;
}
.site-nav a:hover{ color: var(--text); }

/* =========================================================
   BUTTONS
   ========================================================= */
.btn{
  display:inline-flex; align-items:center; justify-content:center;
  font-family: var(--btn-font); font-weight:600; font-size: 15px;
  padding: 12px 22px; border-radius: var(--btn-radius);
  border: 1px solid transparent;
  cursor:pointer; transition: transform .15s var(--ease), box-shadow .2s, background .3s, border-color .3s;
  white-space: nowrap;
}
.btn:active{ transform: translateY(1px) scale(.99); }
.btn-primary{
  background: linear-gradient(160deg, var(--accent-hi), var(--accent));
  color: var(--accent-text); box-shadow: var(--shadow);
}
.btn-primary:hover{ filter: brightness(1.06); }
.btn-ghost{
  background: transparent; color: var(--text); border-color: var(--border);
}
.btn-ghost:hover{ border-color: var(--accent); color: var(--accent-hi); }
.btn-lg{ padding: 15px 28px; font-size: 16px; }

/* =========================================================
   TICKER
   ========================================================= */
.ticker{
  background: var(--stamp-red); color: #fff; overflow:hidden;
  border-bottom: 1px solid var(--border);
}
.ticker-track{
  display:flex; gap: 14px; white-space:nowrap; width: max-content;
  font-family: var(--font-mono); font-size: 12.5px; font-weight:600; letter-spacing:.04em;
  padding: 7px 0;
  animation: scroll-left 38s linear infinite;
}
.ticker-track span{ padding: 0 4px; }
@keyframes scroll-left{
  from{ transform: translateX(0); }
  to{ transform: translateX(-50%); }
}

/* =========================================================
   HERO
   ========================================================= */
.hero{ padding: 96px 0 76px; position:relative; z-index: 2; }
.hero-inner{
  display:grid; grid-template-columns: .95fr 1.15fr; gap: 48px; align-items:center;
}
.hero-copy{ min-width:0; }
.eyebrow{
  font-family: var(--font-stamp); font-weight:700; font-size: 13px;
  letter-spacing:.14em; color: var(--accent); margin: 0 0 18px;
}
.eyebrow-center{ text-align:center; }
.hero-title{
  font-family: var(--font-display); font-weight:700;
  font-size: clamp(2.6rem, 6vw, 5rem);
  line-height: 1.02; letter-spacing:-.02em; margin: 0 0 28px;
  max-width: 900px;
}
.hero-strike{ position:relative; color: var(--text-dim); }
.hero-strike::after{
  content:''; position:absolute; left:-2%; right:-2%; top:48%;
  height: .09em; background: var(--stamp-red); transform: rotate(-2deg);
}
.hero-sub{
  font-size: 19px; color: var(--text-dim); max-width: 640px; margin: 0 0 36px;
}
.hero-sub strong{ color: var(--text); }
.hero-cta{ display:flex; gap:16px; flex-wrap:wrap; margin-bottom: 18px; }
.hero-disclaimer{ font-size: 12.5px; color: var(--text-dim); opacity:.7; }

.hero-evidence{ display:flex; flex-direction:column; gap:24px; min-width:0; }
.hero-card{ margin:0; display:flex; flex-direction:column; gap:10px; width:97%; }
.hero-card-tag{
  font-family: var(--font-stamp); font-weight:700; font-size: 11.5px;
  letter-spacing:.08em; color: var(--stamp-red);
}
.hero-card-a{ align-self:flex-start; }
.hero-card-b{ align-self:flex-end; }
@media (min-width: 641px){
  .hero-card-a{ transform: rotate(-2.5deg); }
  .hero-card-b{ transform: rotate(2deg); }
}
@media (min-width: 901px){
  .hero-card-b{ margin-top:-14px; }
}
.hero-card-frame{
  border-radius: var(--radius); overflow:hidden;
  border: 1px solid var(--border); box-shadow: var(--shadow); background: var(--surface-2);
}
.hero-card-frame img{ width:100%; }
.hero-card-frame-tweet{ background:#000; padding:4px; }

/* =========================================================
   SECTION SHARED
   ========================================================= */
section{ padding: 88px 0; position:relative; z-index:2; }
.section-title{
  font-family: var(--font-display); font-weight:700;
  font-size: clamp(1.9rem, 3.4vw, 2.75rem);
  text-align:center; letter-spacing:-.01em; margin: 0 0 12px;
}
.section-sub{
  text-align:center; color: var(--text-dim); max-width: 560px; margin: 0 auto 56px;
  font-size: 16px;
}

.lore{ background: var(--bg-alt); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

/* =========================================================
   EXHIBITS
   ========================================================= */
.exhibits{ display:grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.exhibit{ margin:0; }
.exhibit-frame{
  border-radius: var(--radius); overflow:hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  background: var(--surface-2);
}
.browser-bar{
  display:flex; align-items:center; gap:8px;
  padding: 9px 12px; background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.dot{ width:9px; height:9px; border-radius:50%; }
.dot-r{ background:#ff5f57; } .dot-y{ background:#febc2e; } .dot-g{ background:#28c840; }
.browser-url{
  margin-left: 10px; font-family: var(--font-mono); font-size: 11.5px; color: var(--text-dim);
  background: var(--bg); padding: 3px 10px; border-radius: 4px; flex:1;
}
.tweet-frame{ background: #000; padding: 4px; }
.exhibit figcaption{
  margin-top: 16px; font-size: 14px; color: var(--text-dim); line-height:1.6;
}
.exhibit-tag{
  display:inline-block; font-family: var(--font-stamp); font-weight:700;
  font-size: 12px; letter-spacing:.08em; color: var(--stamp-red);
  border: 1.5px solid var(--stamp-red); border-radius: 4px;
  padding: 2px 7px; margin-right: 8px; transform: rotate(-2deg);
}

/* =========================================================
   TIMELINE
   ========================================================= */
.timeline{ list-style:none; margin: 0 auto; padding:0; max-width: 720px; position:relative; }
.timeline::before{
  content:''; position:absolute; left: 74px; top:8px; bottom:8px; width:2px;
  background: var(--border);
}
.tl-item{ display:flex; gap: 28px; padding: 0 0 44px; position:relative; }
.tl-item:last-child{ padding-bottom:0; }
.tl-year{
  font-family: var(--font-stamp); font-weight:800; font-size: 15px;
  color: var(--accent-text); background: var(--accent);
  width: 64px; height: 64px; border-radius:50%;
  display:flex; align-items:center; justify-content:center;
  flex-shrink:0; z-index:1; box-shadow: var(--shadow);
}
.tl-body h3{ margin: 8px 0 8px; font-family: var(--font-display); font-size: 19px; }
.tl-body p{ margin:0; color: var(--text-dim); font-size: 15px; max-width: 520px; }

/* =========================================================
   WARNING STRIP
   ========================================================= */
.warning-strip{
  max-width: 720px; margin: 0 auto; text-align:center;
  font-size: 13.5px; color: var(--stamp-red); line-height:1.6;
  border: 1px dashed var(--stamp-red); border-radius: 10px; padding: 14px 20px;
}

/* =========================================================
   FAQ
   ========================================================= */
.accordion{ max-width: 720px; margin: 0 auto; }
.acc-item{
  border-bottom: 1px solid var(--border); padding: 20px 0;
}
.acc-item summary{
  cursor:pointer; font-family: var(--font-display); font-weight:600; font-size: 17px;
  list-style:none; display:flex; justify-content:space-between; align-items:center;
}
.acc-item summary::-webkit-details-marker{ display:none; }
.acc-item summary::after{
  content:'+'; font-size: 22px; color: var(--accent); flex-shrink:0; margin-left: 16px;
  transition: transform .25s var(--ease);
}
.acc-item[open] summary::after{ transform: rotate(45deg); }
.acc-item p{ color: var(--text-dim); font-size: 15px; margin: 14px 0 0; max-width: 620px; }

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer{ background: var(--bg-alt); border-top: 1px solid var(--border); padding: 56px 0 28px; }
.footer-inner{
  display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap;
  gap: 24px; padding-bottom: 36px; margin-bottom: 28px; border-bottom: 1px solid var(--border);
}
.footer-brand{ display:flex; align-items:center; gap:10px; }
.footer-links{ display:flex; gap: 22px; }
.footer-links a{ font-size: 14px; color: var(--text-dim); }
.footer-links a:hover{ color: var(--text); }
.footer-fine p{
  font-size: 12px; color: var(--text-dim); opacity:.65; line-height:1.7; max-width: 900px;
  margin: 0 0 10px;
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 900px){
  .hero-inner{ grid-template-columns: 1fr; gap: 44px; }
  .hero-evidence{ margin-top: 8px; }
}
@media (max-width: 860px){
  .site-nav{ display:none; }
  .exhibits{ grid-template-columns: 1fr; }
  .timeline::before{ left: 30px; }
  .tl-year{ width:52px; height:52px; font-size:12.5px; }
}
@media (max-width: 640px){
  .hero-card{ width:100%; }
  .hero-card-a, .hero-card-b{ align-self:center; }
}
@media (max-width: 540px){
  .hero{ padding: 64px 0 56px; }
  section{ padding: 64px 0; }
  .hero-evidence{ gap: 18px; }
}