:root {
  --warm-white: #fffbf5;
  --warm-wash: #f8f1e6;
  --coin: #f0c014;
  --coin-deep: #d4a50a;
  --ink: #1c1814;
  --ink-soft: #5c5348;
  --line: #e7ddd0;
  --shadow: rgba(80, 55, 10, 0.12);

  --font-display: "Young Serif", Georgia, serif;
  --font-body: "Figtree", system-ui, sans-serif;

  --pad: clamp(1.25rem, 4vw, 2.5rem);
  --max: 42rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.55;
  background:
    radial-gradient(
      120% 80% at 50% -10%,
      rgba(240, 192, 20, 0.18),
      transparent 55%
    ),
    linear-gradient(180deg, var(--warm-white) 0%, var(--warm-wash) 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.grain {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 50;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* Header */
.top {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem var(--pad);
  background: linear-gradient(
    180deg,
    rgba(255, 251, 245, 0.92),
    rgba(255, 251, 245, 0)
  );
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.brand-mark img {
  width: 1.5rem;
  height: 1.5rem;
}

.x-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 0.95rem;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--ink);
  color: var(--warm-white);
  font-size: 0.9rem;
  font-weight: 500;
  transition:
    transform 0.25s ease,
    background 0.25s ease,
    color 0.25s ease;
}

.x-btn:hover {
  transform: translateY(-1px);
  background: transparent;
  color: var(--ink);
}

.x-btn:focus-visible {
  outline: 2px solid var(--coin-deep);
  outline-offset: 3px;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 6.5rem var(--pad) 4rem;
  overflow: hidden;
}

.hero-coin {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  pointer-events: none;
}

.coin-glow {
  position: absolute;
  width: min(70vw, 28rem);
  height: min(70vw, 28rem);
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(240, 192, 20, 0.45) 0%,
    rgba(240, 192, 20, 0.1) 45%,
    transparent 70%
  );
  filter: blur(8px);
  animation: pulse 5.5s ease-in-out infinite;
}

.coin {
  position: relative;
  width: min(72vw, 26rem);
  height: auto;
  filter: drop-shadow(0 28px 40px var(--shadow));
  animation: float 6s ease-in-out infinite;
  opacity: 0.95;
}

.hero-copy {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 28rem;
  margin-top: min(42vw, 15rem);
  padding: 1.25rem 1rem 0;
  animation: rise 0.9s ease both;
}

.hero-copy::before {
  content: "";
  position: absolute;
  inset: -10% -20% -20%;
  z-index: -1;
  background: radial-gradient(
    ellipse at 50% 30%,
    rgba(255, 251, 245, 0.88) 0%,
    rgba(255, 251, 245, 0.55) 45%,
    transparent 72%
  );
}

.brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 8vw, 4.5rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.lede {
  margin: 1rem auto 1.6rem;
  max-width: 24rem;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 2.4vw, 1.2rem);
  text-wrap: pretty;
}

.x-btn-hero {
  background: var(--warm-white);
  color: var(--ink);
  border-color: var(--ink);
  box-shadow: 0 10px 30px var(--shadow);
}

.x-btn-hero:hover {
  background: var(--ink);
  color: var(--warm-white);
}

/* Sections */
.problem,
.fix,
.close {
  padding: clamp(4rem, 10vw, 7rem) var(--pad);
}

.problem,
.fix {
  max-width: calc(var(--max) + 2 * var(--pad));
  margin: 0 auto;
}

.section-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 5vw, 2.8rem);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.section-support {
  margin: 0.9rem 0 0;
  max-width: 34rem;
  color: var(--ink-soft);
  font-size: 1.1rem;
  text-wrap: pretty;
}

.stat-stack {
  display: grid;
  gap: 2.25rem;
  margin-top: 2.75rem;
  padding-top: 2.25rem;
  border-top: 1px solid var(--line);
}

.stat-num {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 7vw, 3.6rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--coin-deep);
}

.stat-text {
  margin: 0.7rem 0 0;
  max-width: 28rem;
  font-size: 1.15rem;
  color: var(--ink);
}

/* Thesis */
.thesis {
  list-style: none;
  margin: 2.75rem 0 0;
  padding: 2.25rem 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  gap: 1.75rem;
}

.thesis li {
  display: grid;
  gap: 0.35rem;
}

.thesis-verb {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.5vw, 1.7rem);
  letter-spacing: -0.02em;
}

.thesis-note {
  color: var(--ink-soft);
  font-size: 1.05rem;
}

/* Close */
.close {
  text-align: center;
  display: grid;
  justify-items: center;
  gap: 0.85rem;
  padding-bottom: 5rem;
}

.close-coin {
  width: 5.5rem;
  height: 5.5rem;
  margin-bottom: 0.4rem;
  filter: drop-shadow(0 12px 20px var(--shadow));
  animation: float 6s ease-in-out infinite;
}

.brand-close {
  font-size: clamp(2rem, 6vw, 3rem);
}

.close-line {
  margin: 0 0 0.75rem;
  color: var(--ink-soft);
  font-size: 1.1rem;
  max-width: 22rem;
}

.foot {
  padding: 1.5rem var(--pad) 2.5rem;
  text-align: center;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

.foot p {
  margin: 0;
  font-family: var(--font-display);
}

/* Reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.7s ease,
    transform 0.7s ease;
}

.reveal.is-in {
  opacity: 1;
  transform: none;
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes pulse {
  0%,
  100% {
    opacity: 0.7;
    transform: scale(1);
  }
  50% {
    opacity: 1;
    transform: scale(1.05);
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@media (min-width: 820px) {
  .coin {
    width: min(58vw, 30rem);
  }

  .coin-glow {
    width: min(62vw, 34rem);
    height: min(62vw, 34rem);
  }

  .hero-copy {
    margin-top: 14rem;
    max-width: 32rem;
  }

  .brand {
    font-size: clamp(3.2rem, 6vw, 5rem);
  }
}

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

  .coin,
  .close-coin,
  .coin-glow,
  .hero-copy {
    animation: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .x-btn {
    transition: none;
  }
}