:root {
  --ink: #1a2a33;
  --ink-soft: rgba(26, 42, 51, 0.72);
  --mute: rgba(26, 42, 51, 0.55);
  --sky-top: #9fd4ef;
  --sky-mid: #d9eef8;
  --sky-low: #f3f7f2;
  --sun: #f2b86a;
  --sun-soft: rgba(242, 184, 106, 0.45);
  --hill-a: #7eb39a;
  --hill-b: #5f9a86;
  --hill-c: #3f7a6a;
  --ground: #2f5f54;
  --paper: #f7faf8;
  --line: rgba(26, 42, 51, 0.1);
  --accent: #2f7d6d;
  --font-display: "Fraunces", "Songti SC", "Noto Serif SC", serif;
  --font-body: "Sora", "PingFang SC", "HarmonyOS Sans SC", "Hiragino Sans GB", sans-serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --pad-x: clamp(1.5rem, 5vw, 4.5rem);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-body);
  font-size: 1.0625rem;
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

.mono {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.95em;
}

.page {
  overflow-x: clip;
}

/* —— top —— */
.top {
  position: fixed;
  inset: 0 0 auto;
  z-index: 20;
  display: flex;
  align-items: center;
  padding: 1.2rem var(--pad-x);
  pointer-events: none;
}

.mark {
  pointer-events: auto;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: lowercase;
  color: rgba(26, 42, 51, 0.7);
  opacity: 0;
  transform: translateY(-8px);
  animation: fade-down 0.9s var(--ease) 0.15s forwards;
}

/* —— hero —— */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  align-items: end;
  overflow: hidden;
}

.hero-sky {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.sky-wash {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 55% 40% at 72% 22%, var(--sun-soft), transparent 60%),
    linear-gradient(180deg, var(--sky-top) 0%, var(--sky-mid) 48%, var(--sky-low) 78%, #e8f0e8 100%);
}

.sun {
  position: absolute;
  top: 14%;
  right: 18%;
  width: clamp(5.5rem, 14vw, 9rem);
  height: clamp(5.5rem, 14vw, 9rem);
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #ffe2a8 0%, var(--sun) 55%, #e89a45 100%);
  box-shadow: 0 0 0 18px rgba(242, 184, 106, 0.12);
  animation: sun-breathe 10s ease-in-out infinite;
}

.hills {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 12%;
  width: 100%;
  height: min(42vh, 420px);
  display: block;
}

.hill {
  fill: var(--hill-a);
}

.hill-a {
  fill: var(--hill-a);
  animation: hill-drift 18s ease-in-out infinite alternate;
}

.hill-b {
  fill: var(--hill-b);
  animation: hill-drift 14s ease-in-out infinite alternate-reverse;
}

.hill-c {
  fill: var(--hill-c);
}

.ground {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 14%;
  background: linear-gradient(180deg, var(--ground) 0%, #234840 100%);
}

.hero-copy {
  position: relative;
  z-index: 1;
  max-width: 40rem;
  padding: 0 var(--pad-x) clamp(5.5rem, 12vh, 8rem);
  color: #f4faf7;
}

.brand {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: clamp(3.4rem, 11vw, 6.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.02;
  opacity: 0;
  transform: translateY(22px);
  animation: rise 1s var(--ease) 0.2s forwards;
}

.headline {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.2vw, 1.85rem);
  font-weight: 500;
  letter-spacing: 0.02em;
  line-height: 1.35;
  color: rgba(244, 250, 247, 0.92);
  opacity: 0;
  transform: translateY(18px);
  animation: rise 1s var(--ease) 0.35s forwards;
}

.lede {
  margin: 1rem 0 0;
  max-width: 26rem;
  font-size: clamp(0.98rem, 2vw, 1.1rem);
  font-weight: 300;
  line-height: 1.7;
  color: rgba(244, 250, 247, 0.78);
  opacity: 0;
  transform: translateY(18px);
  animation: rise 1s var(--ease) 0.5s forwards;
}

.cta-group {
  margin-top: 1.75rem;
  opacity: 0;
  transform: translateY(18px);
  animation: rise 1s var(--ease) 0.65s forwards;
}

.cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.4rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ink);
  background: rgba(247, 250, 248, 0.92);
  border: 1px solid rgba(255, 255, 255, 0.35);
  transition: transform 0.25s var(--ease), background 0.25s var(--ease);
}

.cta:hover {
  transform: translateY(-2px);
  background: #fff;
}

/* —— sections —— */
.about,
.note {
  position: relative;
  padding: clamp(4.5rem, 10vh, 7rem) var(--pad-x);
  background: var(--paper);
}

.about-inner,
.note-inner {
  max-width: 42rem;
  margin: 0 auto;
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.about-inner.is-in,
.note-inner.is-in {
  opacity: 1;
  transform: translateY(0);
}

.eyebrow {
  margin: 0 0 0.85rem;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.about-title,
.note-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 4vw, 2.6rem);
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.about-text,
.note-text {
  margin: 1.25rem 0 0;
  max-width: 36rem;
  color: var(--ink-soft);
  font-weight: 300;
}

.facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.25rem 1rem;
  margin: 2.5rem 0 0;
  padding: 1.75rem 0 0;
  border-top: 1px solid var(--line);
}

.facts dt {
  margin: 0 0 0.3rem;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mute);
}

.facts dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 600;
}

.note {
  border-top: 1px solid var(--line);
  background:
    linear-gradient(180deg, #f0f6f3 0%, var(--paper) 100%);
}

/* —— footer —— */
.foot {
  padding: 2rem var(--pad-x) 2.5rem;
  border-top: 1px solid var(--line);
  background: #eef4f1;
}

.foot-main {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  font-size: 0.875rem;
  color: var(--ink-soft);
}

.foot-main a {
  color: var(--mute);
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.foot-main a:hover {
  color: var(--accent);
  border-color: rgba(47, 125, 109, 0.35);
}

.foot-copy {
  margin: 0.85rem 0 0;
  font-size: 0.75rem;
  color: var(--mute);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-down {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes sun-breathe {
  0%, 100% {
    transform: scale(1);
    opacity: 0.95;
  }
  50% {
    transform: scale(1.04);
    opacity: 1;
  }
}

@keyframes hill-drift {
  from {
    transform: translateX(0);
  }
  to {
    transform: translateX(-1.5%);
  }
}

@media (max-width: 720px) {
  .facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-copy {
    padding-bottom: clamp(4.5rem, 16vh, 6.5rem);
  }

  .sun {
    top: 12%;
    right: 10%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }

  .mark,
  .brand,
  .headline,
  .lede,
  .cta-group,
  .about-inner,
  .note-inner {
    opacity: 1;
    transform: none;
  }
}