:root {
  --paper: #fff6f2;
  --paper-deep: #ffe8df;
  --ink: #3a2e2a;
  --muted: #9a8580;
  --line: #f0ddd4;
  --accent: #ff6b7a;
  --accent-deep: #f25568;
  --accent-soft: #ffe0e4;
  --pine: #4daa8b;
  --pine-soft: #ddf3ea;
  --card: #fffff8;
  --shadow: 0 18px 50px rgba(58, 46, 42, 0.08);
  --font-display: "ZCOOL XiaoWei", "Songti SC", "Noto Serif SC", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(900px 520px at 12% -10%, #ffd4c8 0%, transparent 55%),
    radial-gradient(800px 480px at 100% 8%, #c8f0e0 0%, transparent 50%),
    linear-gradient(180deg, var(--paper) 0%, #fff 42%, var(--paper-deep) 100%);
  line-height: 1.6;
}

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

.wrap {
  width: min(1080px, calc(100% - 40px));
  margin: 0 auto;
}

/* —— Hero：一屏一构图 —— */
.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 48px 0 64px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(135deg, rgba(255, 107, 122, 0.12), transparent 42%),
    linear-gradient(320deg, rgba(77, 170, 139, 0.14), transparent 40%);
}

.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(2px);
  opacity: 0.55;
  animation: float 9s ease-in-out infinite;
}

.hero-orb.a {
  width: 220px;
  height: 220px;
  right: 8%;
  top: 18%;
  background: radial-gradient(circle at 30% 30%, #ffb4bc, #ff6b7a 70%);
}

.hero-orb.b {
  width: 160px;
  height: 160px;
  left: 6%;
  bottom: 16%;
  background: radial-gradient(circle at 30% 30%, #b8f0d8, #4daa8b 70%);
  animation-delay: -3s;
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-16px); }
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 28px;
  max-width: 640px;
}

.brand {
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 9vw, 5.4rem);
  letter-spacing: 0.04em;
  line-height: 1.05;
  color: var(--ink);
}

.headline {
  font-size: clamp(1.15rem, 2.6vw, 1.45rem);
  font-weight: 500;
  color: var(--ink);
}

.lead {
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 32em;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
  margin-top: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border: 0;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  border-radius: 999px;
  padding: 14px 28px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.btn-primary {
  color: #fff;
  background: linear-gradient(90deg, var(--accent), var(--accent-deep));
  box-shadow: 0 10px 28px rgba(242, 85, 104, 0.35);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px rgba(242, 85, 104, 0.42);
}

.btn-ghost {
  color: var(--accent-deep);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--line);
  backdrop-filter: blur(8px);
}

.btn-ghost:hover {
  background: #fff;
}

.meta {
  font-size: 0.88rem;
  color: var(--muted);
}

.meta strong {
  color: var(--pine);
  font-weight: 600;
}

/* —— 介绍区 —— */
.section {
  padding: 72px 0 40px;
}

.section h2 {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  margin-bottom: 10px;
}

.section .sub {
  color: var(--muted);
  margin-bottom: 36px;
  max-width: 36em;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.feature {
  padding: 8px 4px 8px 0;
}

.feature .mark {
  width: 42px;
  height: 6px;
  border-radius: 999px;
  background: var(--accent);
  margin-bottom: 16px;
}

.feature:nth-child(2) .mark { background: var(--pine); }
.feature:nth-child(3) .mark { background: #f0a05a; }

.feature h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.feature p {
  color: var(--muted);
  font-size: 0.95rem;
}

.how {
  margin-top: 56px;
  padding: 28px 0 8px;
  border-top: 1px solid var(--line);
}

.how ol {
  margin: 18px 0 0 1.1em;
  color: var(--ink);
}

.how li {
  margin: 10px 0;
  color: var(--muted);
}

.how li strong {
  color: var(--ink);
  font-weight: 600;
}

.download-band {
  margin: 48px 0 24px;
  padding: 28px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
}

.download-band p {
  color: var(--muted);
  max-width: 28em;
}

.footer {
  padding: 28px 0 48px;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--line);
  margin-top: 24px;
}

@media (max-width: 820px) {
  .features {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .hero-orb.a {
    width: 140px;
    height: 140px;
    top: 10%;
  }

  .hero-orb.b {
    width: 110px;
    height: 110px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-orb { animation: none; }
  .btn { transition: none; }
}