/* 随心说官网：声息感 · 凉雾纸面 · 青绿强调 */
* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --ink: #12151c;
  --ink-soft: #2c3340;
  --muted: #5c6578;
  --line: rgba(18, 21, 28, 0.12);
  --paper: #e8eef4;
  --teal: #0a6f6b;
  --teal-deep: #055754;
  --coral: #d63f30;
  --got: #0a5c3c;
  --font-display: "Noto Serif SC", "Songti SC", "SimSun", serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max: 880px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.65;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background: linear-gradient(168deg, #dfe8f1 0%, #e8eef4 45%, #f0ebe4 100%);
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(72px);
  opacity: 0.65;
  animation: drift 18s ease-in-out infinite;
}
.orb-a {
  width: min(70vw, 720px);
  height: min(70vw, 720px);
  top: -18%;
  left: 18%;
  background: radial-gradient(circle, rgba(10, 111, 107, 0.32), transparent 68%);
}
.orb-b {
  width: min(50vw, 520px);
  height: min(50vw, 520px);
  bottom: 5%;
  right: -8%;
  background: radial-gradient(circle, rgba(214, 63, 48, 0.14), transparent 70%);
  animation-delay: -7s;
}
.grain {
  position: absolute;
  inset: 0;
  opacity: 0.04;
  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");
}

@keyframes drift {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50% { transform: translate3d(-1.5%, 2.5%, 0) scale(1.05); }
}

.top, main, footer { position: relative; z-index: 1; }

.top {
  max-width: var(--max);
  margin: 0 auto;
  padding: 22px 28px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand-mini {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--ink);
  opacity: 0.4;
}
.btn-ghost {
  font-size: 13.5px;
  font-weight: 600;
  color: var(--teal-deep);
  text-decoration: none;
  padding: 8px 14px;
  border: 1px solid rgba(10, 111, 107, 0.4);
  border-radius: 999px;
  transition: background 0.2s;
}
.btn-ghost:hover { background: rgba(10, 111, 107, 0.08); }

/* ── Hero：品牌 + 一句主张 + CTA + 全宽产品瞬间 ── */
.hero {
  max-width: var(--max);
  margin: 0 auto;
  min-height: calc(100vh - 64px);
  padding: 56px 28px 64px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.brand {
  font-family: var(--font-display);
  font-size: clamp(52px, 9vw, 84px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0.06em;
  color: var(--ink);
  margin-bottom: 20px;
  animation: rise 0.85s cubic-bezier(0.22, 1, 0.36, 1) both;
}
h1 {
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 500;
  line-height: 1.4;
  color: var(--ink-soft);
  max-width: 18em;
  animation: rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.06s both;
}
.lead {
  margin: 16px 0 28px;
  font-size: 16px;
  color: var(--muted);
  max-width: 32em;
  animation: rise 0.95s cubic-bezier(0.22, 1, 0.36, 1) 0.1s both;
}

.cta {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  animation: rise 1s cubic-bezier(0.22, 1, 0.36, 1) 0.14s both;
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  border-radius: 999px;
  background: var(--teal);
  color: #fff;
  font-size: 15.5px;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.18s, background 0.18s, box-shadow 0.18s;
  box-shadow: 0 12px 32px rgba(10, 111, 107, 0.3);
}
.btn-primary:hover {
  background: var(--teal-deep);
  transform: translateY(-1px);
}
.version { color: var(--muted); font-size: 13.5px; }
.invite {
  margin-top: 12px;
  font-size: 13.5px;
  color: var(--muted);
  animation: rise 1s cubic-bezier(0.22, 1, 0.36, 1) 0.16s both;
}

.hero-visual {
  margin-top: 48px;
  padding-top: 36px;
  border-top: 1px solid var(--line);
  animation: rise 1.1s cubic-bezier(0.22, 1, 0.36, 1) 0.2s both;
}

.capsule-demo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px 10px 14px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(18, 21, 28, 0.08);
  box-shadow: 0 14px 40px rgba(18, 21, 28, 0.08);
  margin-bottom: 22px;
  animation: pulse-soft 2.4s ease-in-out infinite;
}
.rec-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--coral);
  animation: rec 1.6s ease-out infinite;
}
.wave {
  display: flex;
  align-items: center;
  gap: 3px;
  height: 18px;
}
.wave i {
  display: block;
  width: 3px;
  border-radius: 2px;
  background: var(--teal);
  animation: bar 1.1s ease-in-out infinite;
}
.wave i:nth-child(1) { height: 6px; animation-delay: 0s; }
.wave i:nth-child(2) { height: 12px; animation-delay: 0.12s; }
.wave i:nth-child(3) { height: 18px; animation-delay: 0.24s; }
.wave i:nth-child(4) { height: 10px; animation-delay: 0.36s; }
.wave i:nth-child(5) { height: 7px; animation-delay: 0.48s; }
.capsule-label {
  font-size: 12.5px;
  font-weight: 600;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

.transform { max-width: 520px; }
.said {
  font-size: 16.5px;
  line-height: 1.7;
  color: var(--muted);
  animation: fade-cycle 7s ease-in-out infinite;
}
.said em {
  font-style: normal;
  color: var(--coral);
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}
.transform-arrow {
  margin: 12px 0;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--teal);
}
.got {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 22px;
  line-height: 1.5;
  color: var(--got);
  animation: got-cycle 7s ease-in-out infinite;
}

@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse-soft {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.02); }
}
@keyframes rec {
  0% { box-shadow: 0 0 0 0 rgba(214, 63, 48, 0.45); }
  70% { box-shadow: 0 0 0 10px rgba(214, 63, 48, 0); }
  100% { box-shadow: 0 0 0 0 rgba(214, 63, 48, 0); }
}
@keyframes bar {
  0%, 100% { transform: scaleY(0.55); opacity: 0.7; }
  50% { transform: scaleY(1); opacity: 1; }
}
@keyframes fade-cycle {
  0%, 18% { opacity: 1; }
  35%, 55% { opacity: 0.4; }
  70%, 100% { opacity: 1; }
}
@keyframes got-cycle {
  0%, 22% { opacity: 0.3; transform: translateY(3px); }
  40%, 62% { opacity: 1; transform: translateY(0); }
  80%, 100% { opacity: 0.4; transform: translateY(2px); }
}

.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: 88px 28px 0;
}
.section h2 {
  font-family: var(--font-display);
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.02em;
  margin-bottom: 12px;
}
.section-lead {
  font-size: 16.5px;
  color: var(--muted);
  margin-bottom: 36px;
  max-width: 34em;
}

.beats {
  list-style: none;
  border-top: 1px solid var(--line);
}
.beats li {
  display: grid;
  grid-template-columns: 8.5em 1fr;
  gap: 20px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line);
  align-items: baseline;
}
.beats strong {
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
}
.beats span {
  font-size: 15px;
  color: var(--muted);
}

.handoff .scene {
  margin: 8px 0 18px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.scene-said {
  font-size: 17px;
  color: var(--ink-soft);
  margin-bottom: 18px;
  line-height: 1.7;
}
.scene-result {
  font-size: 15.5px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.scene-result span {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--teal-deep);
  border-bottom: 2px solid rgba(10, 111, 107, 0.35);
  padding-bottom: 1px;
}
.scene-note {
  font-size: 13.5px;
  color: var(--muted);
}

.trust p {
  font-size: 15.5px;
  color: var(--muted);
  max-width: 36em;
}

footer {
  max-width: var(--max);
  margin: 96px auto 0;
  padding: 28px;
  display: flex;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.06em;
}

@media (max-width: 640px) {
  .hero { padding-top: 40px; min-height: auto; }
  .beats li {
    grid-template-columns: 1fr;
    gap: 6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .orb, .capsule-demo, .wave i, .rec-dot, .said, .got,
  .brand, h1, .lead, .cta, .invite, .hero-visual {
    animation: none !important;
  }
  .got { opacity: 1; }
}