/* BTC 21M — landing page styles */
:root {
  --paper: #F2F4F1;
  --paper-2: #FAFBF9;
  --ink: #17201C;
  --ink-2: #4A5650;
  --line: #CBD3CE;
  --forest: #0E5A47;
  --forest-2: #0A4536;
  --forest-tint: #DCE8E2;
  --amber: #C98200;
  --amber-bright: #F0A818;
  --alarm: #B3361F;
  --alarm-tint: #F6E1DC;
  --watch-tint: #F8EBCF;
  --display: "Bricolage Grotesque", "Helvetica Neue", Arial, sans-serif;
  --text: "Instrument Sans", "Helvetica Neue", Arial, sans-serif;
  --wrap: 1120px;
  --gutter: clamp(16px, 5vw, 48px);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 400 1.0625rem/1.6 var(--text);
  text-rendering: optimizeLegibility;
}
img, svg { display: block; }
a { color: var(--forest); text-underline-offset: 3px; }
a:hover { color: var(--forest-2); }
:focus-visible { outline: 3px solid var(--amber-bright); outline-offset: 3px; border-radius: 4px; }

.skip { position: absolute; left: -9999px; top: 8px; background: var(--ink); color: var(--paper); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }

h1, h2, h3 { font-family: var(--display); color: var(--ink); margin: 0; }
h2 { font-weight: 600; font-size: clamp(1.75rem, 3.6vw, 2.75rem); line-height: 1.08; letter-spacing: -0.015em; max-width: 22ch; }
h3 { font-weight: 600; font-size: 1.25rem; line-height: 1.25; }
p { margin: 0 0 1em; }

/* Header */
.top {
  max-width: var(--wrap); margin: 0 auto; padding: 20px var(--gutter);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); font: 800 1.125rem/1 var(--display); }
.brand-mark { width: 32px; height: 32px; }
.brand-mark circle { fill: var(--amber-bright); }
.brand-mark text { font: 800 13px var(--display); fill: var(--ink); }
.top-nav { display: flex; gap: 24px; align-items: center; font-size: 0.9375rem; }
.top-nav a { color: var(--ink-2); text-decoration: none; }
.top-nav a:hover { color: var(--ink); text-decoration: underline; }
.top-nav .lang { border: 1px solid var(--line); padding: 4px 10px; border-radius: 999px; }
@media (max-width: 720px) { .top-nav a:not(.lang) { display: none; } }

/* Hero */
main { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--gutter); }
.hero {
  display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: clamp(32px, 6vw, 80px);
  align-items: end; padding: clamp(40px, 8vw, 104px) 0 clamp(56px, 9vw, 112px);
}
.hero h1 {
  font-weight: 800; font-size: clamp(2.6rem, 7vw, 5.25rem); line-height: 0.98; letter-spacing: -0.03em;
  font-variation-settings: "opsz" 96; max-width: 13ch;
}
.lede { font-size: clamp(1.0625rem, 1.6vw, 1.25rem); color: var(--ink-2); max-width: 54ch; margin: 28px 0 32px; }

.supply { margin: 0; border-left: 2px solid var(--ink); padding-left: clamp(16px, 2.5vw, 28px); }
.supply-row { display: grid; gap: 4px; }
.supply-row + .supply-row { margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--line); }
.supply-num { font: 800 clamp(2.4rem, 5.6vw, 4.25rem)/1 var(--display); letter-spacing: -0.03em; font-variant-numeric: tabular-nums; }
.supply-btc .supply-num { color: var(--amber); }
.supply-fiat .supply-num { color: var(--ink-2); font-weight: 400; }
.supply-cap { color: var(--ink-2); max-width: 30ch; }
.inf { display: inline-block; animation: grow 2.4s cubic-bezier(.2,.7,.2,1) .4s both; transform-origin: left center; }
@keyframes grow { from { transform: scale(.35); opacity: 0; } to { transform: scale(1); opacity: 1; } }

/* Forms */
.signup { max-width: 520px; }
.signup label:first-child { display: block; font-weight: 600; margin-bottom: 8px; }
.signup-row { display: flex; gap: 8px; flex-wrap: wrap; }
.signup input[type="email"] {
  flex: 1 1 220px; min-width: 0; font: inherit; padding: 14px 16px; border: 1.5px solid var(--ink);
  border-radius: 10px; background: #fff; color: var(--ink);
}
button, .button {
  font: 600 1rem/1 var(--text); padding: 15px 22px; border: 0; border-radius: 10px; cursor: pointer;
  background: var(--forest); color: #fff; text-decoration: none; display: inline-block;
}
button:hover, .button:hover { background: var(--forest-2); color: #fff; }
button[disabled] { opacity: .6; cursor: progress; }
.fineprint { font-size: 0.875rem; color: var(--ink-2); margin-top: 10px; }
.form-status { font-weight: 600; margin: 10px 0 0; min-height: 1.6em; }
.form-status[data-kind="ok"] { color: var(--forest); }
.form-status[data-kind="err"] { color: var(--alarm); }
.consent { display: flex; gap: 10px; align-items: flex-start; font-size: 0.9375rem; color: var(--ink-2); margin-top: 14px; font-weight: 400; }
.consent input { margin-top: 5px; width: 18px; height: 18px; accent-color: var(--forest); flex: none; }

/* Sections */
.block { padding: clamp(56px, 8vw, 104px) 0; border-top: 1px solid var(--line); }
.block > h2 { margin-bottom: 28px; }
.prose { max-width: 62ch; font-size: 1.125rem; }
.prose p:last-child { margin-bottom: 0; }

/* Simulator */
.sim-intro { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 24px 64px; align-items: end; margin-bottom: 32px; }
.sim-intro p { color: var(--ink-2); margin: 0; max-width: 48ch; }
.sim-panel {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 6fr); background: var(--paper-2);
  border: 1.5px solid var(--ink); border-radius: 16px; overflow: hidden;
}
.sim-controls { padding: clamp(20px, 3vw, 36px); display: grid; gap: 26px; align-content: start; border-right: 1px solid var(--line); }
.field label { display: flex; justify-content: space-between; gap: 12px; font-weight: 600; margin-bottom: 10px; }
.field output { font: 800 1.125rem/1 var(--display); font-variant-numeric: tabular-nums; }
.field input[type="number"] { width: 100%; font: 600 1.125rem var(--text); padding: 12px 14px; border: 1.5px solid var(--line); border-radius: 10px; background: #fff; color: var(--ink); }
.field input[type="range"] { width: 100%; accent-color: var(--forest); height: 28px; }
.sim-controls .fineprint { margin: 0; }

.sim-result { padding: clamp(20px, 3vw, 36px); transition: background-color .3s; }
.sim-result[data-state="safe"] { background: var(--forest-tint); }
.sim-result[data-state="watch"] { background: var(--watch-tint); }
.sim-result[data-state="danger"], .sim-result[data-state="liquidated"] { background: var(--alarm-tint); }
.gauge-track { position: relative; height: 14px; border-radius: 999px; background: #fff; border: 1px solid var(--line); overflow: hidden; }
.gauge-fill { position: absolute; inset: 0 auto 0 0; width: 25%; background: var(--forest); transition: width .25s ease, background-color .25s; }
.sim-result[data-state="watch"] .gauge-fill { background: var(--amber); }
.sim-result[data-state="danger"] .gauge-fill, .sim-result[data-state="liquidated"] .gauge-fill { background: var(--alarm); }
.gauge-mark { position: absolute; top: 0; bottom: 0; left: 86%; width: 2px; background: var(--alarm); }
.gauge-scale { display: flex; justify-content: space-between; font-size: 0.8125rem; color: var(--ink-2); margin: 6px 0 22px; }
.gauge-scale span:last-child { margin-right: 6%; color: var(--alarm); font-weight: 600; }
.sim-figures { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px 24px; margin: 0 0 22px; }
.sim-figures div { border-top: 1px solid rgba(23, 32, 28, .15); padding-top: 8px; }
.sim-figures dt { font-size: 0.875rem; color: var(--ink-2); }
.sim-figures dd { margin: 2px 0 0; font: 600 clamp(1.25rem, 2.4vw, 1.625rem)/1.2 var(--display); font-variant-numeric: tabular-nums; }
#r-hf { font-weight: 800; }
.sim-verdict { font-weight: 600; margin: 0; max-width: 46ch; }

/* Path */
.steps { list-style: none; margin: 0; padding: 0; counter-reset: step; display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 300px), 1fr)); gap: 0 48px; }
.steps li { counter-increment: step; position: relative; padding: 0 0 30px 64px; }
.steps li::before {
  content: counter(step); position: absolute; left: 0; top: -4px; width: 40px; height: 40px; border-radius: 50%;
  display: grid; place-items: center; font: 800 1.125rem/1 var(--display); background: var(--paper); color: var(--forest); border: 2px solid var(--forest);
}
.steps li::after { content: ""; position: absolute; left: 20px; top: 40px; bottom: 0; width: 2px; background: var(--forest-tint); }
.steps li:last-child::after { display: none; }
.steps li:last-child::before { background: var(--forest); color: #fff; }
.steps p { color: var(--ink-2); margin: 6px 0 0; max-width: 40ch; }

/* Challenge — the one dark block */
.challenge {
  background: var(--forest-2); color: #E9F1EC; border-radius: 20px; border-top: 0;
  padding-inline: clamp(24px, 6vw, 72px); margin: clamp(24px, 4vw, 40px) 0;
}
.challenge h2 { color: #fff; font-size: clamp(2.25rem, 6vw, 4rem); font-weight: 800; letter-spacing: -0.025em; }
.challenge-sub { font: 400 clamp(1.125rem, 2vw, 1.375rem)/1.35 var(--display); color: var(--amber-bright); margin: 12px 0 28px; }
.challenge .prose { color: #E9F1EC; }
.includes { list-style: none; padding: 0; margin: 28px 0 36px; display: flex; flex-wrap: wrap; gap: 10px; }
.includes li { border: 1px solid rgba(255,255,255,.35); border-radius: 999px; padding: 8px 14px; font-size: 0.9375rem; }
.challenge .button { background: var(--amber-bright); color: var(--ink); }
.challenge .button:hover { background: #fff; color: var(--ink); }
.challenge + .block { border-top: 0; }

/* Fit */
.fit { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr)); gap: 48px; }
.fit h2 { font-size: clamp(1.5rem, 2.6vw, 2rem); margin-bottom: 20px; }
.ticks, .crosses { list-style: none; padding: 0; margin: 0; display: grid; gap: 14px; }
.ticks li, .crosses li { position: relative; padding-left: 32px; max-width: 48ch; }
.ticks li::before, .crosses li::before { position: absolute; left: 0; top: 0; font-weight: 800; font-family: var(--display); }
.ticks li::before { content: "✓"; color: var(--forest); }
.crosses li::before { content: "✕"; color: var(--alarm); }

/* FAQ */
.faq details { border-top: 1px solid var(--line); max-width: 760px; }
.faq details:last-of-type { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; list-style: none; padding: 20px 40px 20px 0; position: relative; font: 600 1.1875rem/1.35 var(--display); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 16px; font-size: 1.5rem; color: var(--forest); transition: transform .2s; }
.faq details[open] summary::after { transform: rotate(45deg); }
.faq details p { color: var(--ink-2); max-width: 62ch; margin: 0 0 22px; }

/* Final */
.final h2 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; letter-spacing: -0.025em; max-width: 20ch; margin-bottom: 36px; }

/* Footer */
.foot { max-width: var(--wrap); margin: 0 auto; padding: 40px var(--gutter) 56px; border-top: 1px solid var(--line); font-size: 0.875rem; color: var(--ink-2); }
.disclaimer { max-width: 90ch; }
.foot-links { display: flex; flex-wrap: wrap; gap: 8px 24px; margin: 0; }

/* Responsive */
@media (max-width: 860px) {
  .hero, .sim-intro, .sim-panel { grid-template-columns: minmax(0, 1fr); }
  .hero { align-items: start; }
  .sim-controls { border-right: 0; border-bottom: 1px solid var(--line); }
}
@media (max-width: 420px) {
  .sim-figures { grid-template-columns: minmax(0, 1fr); }
  .signup button { width: 100%; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}