@import url("assets/fonts/xiangkaile-wenkai/font.css");

:root {
  --ink: #18231f;
  --muted: #65736e;
  --fog: #e9f0ed;
  --paper: #f8faf8;
  --line: rgba(40, 72, 62, 0.17);
  --green: #2f7668;
  --green-dark: #21584f;
  --coral: #c86e52;
  --glass: rgba(255, 255, 255, 0.62);
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans CJK SC", sans-serif;
  --display: "LXGW WenKai Screen", "Kaiti SC", serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { display: block; max-width: 100%; }

.site-head {
  position: absolute;
  z-index: 20;
  inset: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: min(1180px, calc(100% - 40px));
  min-height: 72px;
  margin: 0 auto;
}
.brand { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; text-decoration: none; font-weight: 650; }
.brand img { border-radius: 9px; box-shadow: 0 7px 18px rgba(42, 54, 48, 0.14); }
.head-link { display: inline-flex; align-items: center; min-height: 44px; color: var(--muted); text-underline-offset: 4px; }

.hero {
  position: relative;
  display: grid;
  align-items: center;
  min-height: 92svh;
  padding: 112px max(20px, calc((100vw - 1180px) / 2)) 76px;
  overflow: hidden;
  background:
    linear-gradient(90deg, rgba(233, 240, 237, 0.98) 0 48%, rgba(233, 240, 237, 0.72) 66%, rgba(233, 240, 237, 0.9) 100%),
    var(--fog);
}
.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: var(--line);
}
.hero-copy { position: relative; z-index: 5; width: min(590px, 54vw); }
.kicker { margin: 0 0 14px; color: var(--green); font-size: 14px; font-weight: 700; }
h1, h2 { font-family: var(--display); font-weight: 500; letter-spacing: 0; }
h1 { margin: 0; font-size: clamp(68px, 8vw, 118px); line-height: 0.98; }
.hero-line { margin: 28px 0 8px; font-size: clamp(26px, 3vw, 42px); font-weight: 650; }
.hero-detail { max-width: 520px; margin: 0; color: var(--muted); font-size: clamp(17px, 1.7vw, 21px); line-height: 1.75; }
.hero-actions { display: flex; align-items: center; gap: 18px; margin-top: 30px; }
.hero-actions span { color: var(--muted); font-size: 13px; }
.download-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 21px;
  border-radius: 7px;
  color: #fff;
  background: var(--green-dark);
  box-shadow: 0 14px 30px rgba(31, 84, 74, 0.2);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  transition: transform 160ms ease, background 160ms ease, box-shadow 160ms ease;
}
.download-button:focus-visible, .head-link:focus-visible, .brand:focus-visible, .next-cue:focus-visible {
  outline: 3px solid rgba(200, 110, 82, 0.54);
  outline-offset: 4px;
}
.letter-fragment { margin: 34px 0 0; padding: 17px 0 0 18px; border-left: 2px solid var(--coral); }
.letter-fragment span { color: var(--coral); font-size: 12px; font-weight: 700; }
.letter-fragment p { max-width: 470px; margin: 8px 0 0; font-family: var(--display); font-size: 18px; line-height: 1.7; }
.product-scene { position: absolute; z-index: 2; inset: 68px max(20px, calc((100vw - 1180px) / 2)) 0 52%; pointer-events: none; }
.scene-rule { position: absolute; inset: 18% -14vw auto 10%; height: 1px; background: var(--line); transform: rotate(-8deg); }
.phone-shot {
  position: absolute;
  width: clamp(270px, 29vw, 420px);
  border: 7px solid rgba(255,255,255,0.56);
  border-radius: 42px 42px 0 0;
  box-shadow: 0 30px 80px rgba(33, 55, 48, 0.24);
}
.phone-shot-main { z-index: 2; top: 2%; right: 0; transform: rotate(2deg); }
.phone-shot-back { z-index: 1; top: 16%; right: 31%; opacity: 0.44; transform: rotate(-7deg); filter: saturate(0.72); }
.next-cue { position: absolute; z-index: 5; left: 50%; bottom: 18px; transform: translateX(-50%); min-height: 44px; color: var(--muted); font-size: 13px; text-decoration: none; }

.plain-section, .product-band, .perspective-section, .download-close, footer { width: min(1100px, calc(100% - 40px)); margin-inline: auto; }
.plain-section { display: grid; grid-template-columns: 0.8fr 1.4fr; gap: 80px; padding: 100px 0; }
.section-intro h2, .band-copy h2, .perspective-section h2, .download-close h2 { margin: 0; font-size: clamp(34px, 4vw, 55px); line-height: 1.2; }
.process-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.process-list li { display: grid; grid-template-columns: 130px 1fr; gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--line); }
.process-list span { color: var(--green); font-weight: 750; }
.process-list p { margin: 0; color: var(--muted); line-height: 1.75; }

.product-band { display: grid; grid-template-columns: 1.1fr 0.9fr; align-items: center; gap: 76px; padding: 80px 64px; background: #15231f; color: #f2f6f3; }
.band-copy > p:not(.kicker), .perspective-section > div > p:not(.kicker) { color: rgba(242, 246, 243, 0.7); font-size: 17px; line-height: 1.8; }
.quiet-list { margin: 30px 0 0; padding: 0; list-style: none; border-top: 1px solid rgba(255,255,255,0.14); }
.quiet-list li { padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,0.14); color: rgba(242,246,243,0.74); }
.band-media { margin: 0; }
.band-media img { max-height: 660px; margin: 0 auto; border-radius: 30px; box-shadow: 0 30px 72px rgba(0,0,0,0.35); }
.band-media figcaption { margin-top: 12px; color: rgba(242,246,243,0.48); font-size: 12px; text-align: center; }

.perspective-section { display: grid; grid-template-columns: 0.86fr 1.14fr; align-items: center; gap: 84px; padding: 110px 0; }
.perspective-section figure { margin: 0; }
.perspective-section figure img { max-height: 680px; margin: 0 auto; border-radius: 30px; box-shadow: 0 30px 76px rgba(40, 71, 61, 0.17); }
.perspective-section > div > p:not(.kicker) { color: var(--muted); }

.download-close { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 28px; padding: 52px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.download-close img { border-radius: 18px; box-shadow: 0 14px 34px rgba(42,54,48,0.15); }
.download-close h2 { font-size: clamp(28px, 3.4vw, 43px); }
.download-close p:not(.kicker) { max-width: 680px; margin-bottom: 0; color: var(--muted); font-size: 13px; line-height: 1.7; }
footer { display: flex; justify-content: space-between; align-items: center; min-height: 100px; color: var(--muted); font-size: 13px; }
footer nav { display: flex; gap: 20px; }
footer a { min-width: 44px; min-height: 44px; display: inline-flex; align-items: center; justify-content: center; }

@media (hover: hover) and (pointer: fine) {
  .download-button:hover { transform: translateY(-2px); background: var(--green); box-shadow: 0 18px 34px rgba(31,84,74,0.25); }
  .head-link:hover, footer a:hover { color: var(--green); }
}
.download-button:active { transform: scale(0.98); }

@media (max-width: 760px) {
  .site-head { width: calc(100% - 32px); }
  .hero { display: block; min-height: 900px; padding: 112px 20px 70px; }
  .hero-copy { width: 100%; }
  h1 { font-size: 72px; }
  .hero-line { margin-top: 22px; font-size: 29px; }
  .hero-detail { font-size: 17px; }
  .hero-actions { align-items: flex-start; flex-direction: column; gap: 10px; }
  .product-scene { inset: 515px 0 0 0; height: 420px; }
  .phone-shot { width: 238px; border-radius: 28px 28px 0 0; }
  .phone-shot-main { right: 2%; }
  .phone-shot-back { right: 43%; }
  .letter-fragment { margin-top: 24px; }
  .next-cue { display: none; }
  .plain-section, .product-band, .perspective-section, .download-close { width: calc(100% - 32px); }
  .plain-section { grid-template-columns: 1fr; gap: 40px; padding: 72px 0; }
  .process-list li { grid-template-columns: 88px 1fr; gap: 16px; }
  .product-band { grid-template-columns: 1fr; gap: 46px; padding: 56px 24px; }
  .band-media img { max-height: 520px; }
  .perspective-section { grid-template-columns: 1fr; gap: 44px; padding: 76px 0; }
  .perspective-section figure { order: 2; }
  .perspective-section figure img { max-height: 560px; }
  .download-close { grid-template-columns: auto 1fr; gap: 18px; }
  .download-close .download-button { grid-column: 1 / -1; width: 100%; }
  footer { width: calc(100% - 32px); align-items: flex-start; flex-direction: column; justify-content: center; gap: 4px; padding: 28px 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .download-button { transition: none; }
}