/* ============================================================
   落地页（暗色）：颜色/圆角/按钮来自 tokens.css，body 上挂 theme-dark
   ============================================================ */

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body.landing {
  margin: 0; overflow-x: hidden;
  background: var(--bg); color: var(--text);
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}
.landing { position: relative; }
/* 全页环境光：蓝紫弥散，固定铺底，不跟着滚动 */
.landing::before {
  content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(900px 620px at 10% 4%, rgba(91, 75, 255, .30), transparent 62%),
    radial-gradient(820px 560px at 92% 26%, rgba(168, 85, 247, .24), transparent 64%),
    radial-gradient(760px 520px at 50% 108%, rgba(56, 189, 248, .12), transparent 66%);
}
.landing > * { position: relative; z-index: 1; }
.landing a { color: inherit; text-decoration: none; }
.landing img, .landing video { display: block; }

/* ---------- 顶栏 ---------- */
.l-header {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  display: flex; align-items: center; gap: var(--s-6);
  height: 64px; padding: 0 var(--s-7);
  border-bottom: 1px solid transparent;
  transition: background .3s ease, border-color .3s ease, backdrop-filter .3s ease;
}
.l-header.solid {
  background: rgba(7, 7, 11, .42);
  backdrop-filter: saturate(180%) blur(22px);
  -webkit-backdrop-filter: saturate(180%) blur(22px);
  border-bottom-color: rgba(255, 255, 255, .08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .06);
}
.l-brand { font-weight: 800; letter-spacing: .2px; font-size: 16px; color: var(--text); }
.l-brand span { color: var(--brand); }
.l-nav { display: flex; gap: var(--s-5); font-size: 14px; }
.l-nav a { color: var(--muted); transition: color .2s; }
.l-nav a:hover { color: var(--text); }
.l-header .spacer { flex: 1; }

/* ---------- Hero ---------- */
.hero {
  position: relative; min-height: 100vh; min-height: 760px;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  padding: 130px var(--s-6) 300px; text-align: center; overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: -10% -5%; pointer-events: none;
  background:
    radial-gradient(760px 480px at 50% -12%, rgba(124, 92, 255, .52), transparent 62%),
    radial-gradient(640px 440px at 86% 14%, rgba(217, 70, 239, .30), transparent 63%),
    radial-gradient(600px 420px at 6% 34%, rgba(59, 130, 246, .30), transparent 65%),
    radial-gradient(520px 380px at 64% 78%, rgba(168, 85, 247, .20), transparent 68%);
  animation: glowDrift 20s ease-in-out infinite alternate;
}
@keyframes glowDrift {
  from { transform: translate3d(-12px, 0, 0) scale(1); }
  to   { transform: translate3d(12px, -10px, 0) scale(1.05); }
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .5;
  background-image:
    linear-gradient(to right, rgba(255, 255, 255, .045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, .045) 1px, transparent 1px);
  background-size: 88px 88px;
  mask-image: radial-gradient(720px 460px at 50% 32%, #000 10%, transparent 72%);
  -webkit-mask-image: radial-gradient(720px 460px at 50% 32%, #000 10%, transparent 72%);
}
.hero-inner { position: relative; z-index: 2; max-width: 880px; }

.pill {
  display: inline-flex; align-items: center; gap: var(--s-2);
  height: var(--h-sm); padding: 0 var(--s-4);
  border: 1px solid rgba(139, 123, 255, .35); border-radius: var(--r-pill);
  background: rgba(139, 123, 255, .10); color: #cfc9ff;
  font-size: 13px; backdrop-filter: blur(8px);
}
.pill i {
  width: 6px; height: 6px; border-radius: 50%; background: var(--brand);
  box-shadow: 0 0 12px var(--brand); animation: blink 2.2s infinite;
}
@keyframes blink { 0%, 100% { opacity: 1 } 50% { opacity: .35 } }

.hero h1 {
  margin: var(--s-6) 0 var(--s-5);
  font-size: clamp(46px, 7.2vw, 86px);
  line-height: 1.02; letter-spacing: -.035em; font-weight: 820;
  overflow-wrap: anywhere;
}
.hero h1 em,
.final h2 em {
  font-style: normal;
  background: linear-gradient(100deg, #a78bfa 0%, #f0abfc 48%, #67e8f9 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
  filter: drop-shadow(0 0 26px rgba(168, 85, 247, .32));
}
.hero p.lead { margin: 0 auto; max-width: 560px; color: var(--muted); font-size: 17px; line-height: 1.85; }
.hero-cta { display: flex; gap: var(--s-3); justify-content: center; margin-top: var(--s-7); flex-wrap: wrap; }
.hero-meta { display: flex; gap: var(--s-5); justify-content: center; flex-wrap: wrap; margin-top: var(--s-7); color: #6f7488; font-size: 13px; }
.hero-meta b { color: #d9dbe6; font-weight: 650; }
.hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
.hero-meta span:not(:first-child)::before {
  content: ""; width: 4px; height: 4px; border-radius: 50%; background: #3d3f52;
}
.hero-meta span:first-child::before { display: none; }

/* ---------- 视频带 ---------- */
.strip {
  position: absolute; left: 50%; bottom: -40px; z-index: 1;
  width: 150%; height: 300px; overflow: hidden;
  transform: translateX(-50%) rotate(-3deg);
  mask-image: linear-gradient(to bottom, transparent 0%, #000 34%, #000 76%, transparent 100%),
              linear-gradient(to right, transparent 0%, #000 12%, #000 88%, transparent 100%);
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, #000 34%, #000 76%, transparent 100%),
              linear-gradient(to right, transparent 0%, #000 12%, #000 88%, transparent 100%);
  mask-composite: intersect; -webkit-mask-composite: source-in;
}
.strip-track { display: flex; gap: var(--s-4); width: max-content; animation: marquee 64s linear infinite; }
.strip:hover .strip-track { animation-play-state: paused; }
@keyframes marquee { from { transform: translateX(0) } to { transform: translateX(-50%) } }
.strip-item {
  position: relative; width: 152px; aspect-ratio: 9 / 16;
  border-radius: var(--r-lg); overflow: hidden;
  background: var(--surface-2); border: 1px solid var(--line);
  box-shadow: 0 20px 40px rgba(0, 0, 0, .45);
}
.strip-item img, .strip-item video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.strip-item video { opacity: 0; transition: opacity .5s; }
.strip-item.playing video { opacity: 1; }
.strip-item .tag {
  position: absolute; left: 9px; bottom: 9px; z-index: 2;
  background: rgba(0, 0, 0, .55); color: #fff;
  font-size: 11px; padding: 2px 8px; border-radius: var(--r-pill);
}
.hero-fade {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2; height: 110px; pointer-events: none;
  background: linear-gradient(to bottom, transparent, var(--bg) 96%);
}

/* ---------- 段落 ---------- */
.section-l { position: relative; max-width: 1120px; margin: 0 auto; padding: 110px var(--s-7); }
.kicker { color: var(--brand); font-size: 12.5px; font-weight: 750; letter-spacing: .14em; text-transform: uppercase; }
.section-l h2 {
  margin: var(--s-3) 0 var(--s-4);
  font-size: clamp(30px, 4vw, 48px); line-height: 1.15; letter-spacing: -.025em; font-weight: 780;
}
.section-l p.lead { margin: 0; max-width: 560px; color: var(--muted); font-size: 16px; line-height: 1.9; }

/* ---------- 展示 ---------- */
.showcase { display: grid; grid-template-columns: minmax(0, 1fr) 420px; gap: 70px; align-items: center; }
.show-stage { position: relative; display: grid; place-items: center; }
.show-stage::before {
  content: ""; position: absolute; width: 420px; height: 420px; border-radius: 50%;
  background: radial-gradient(circle, rgba(139, 123, 255, .28), transparent 62%);
  filter: blur(20px);
}
.phone-frame {
  position: relative; width: 300px; aspect-ratio: 9 / 16;
  border: 7px solid #17171f; border-radius: 34px; overflow: hidden;
  background: #0b0b10;
  box-shadow: 0 40px 90px rgba(0, 0, 0, .65), 0 0 0 1px rgba(255, 255, 255, .06) inset;
  animation: float 7s ease-in-out infinite;
}
.phone-frame video { width: 100%; height: 100%; object-fit: cover; }
.phone-frame .badge-l {
  position: absolute; left: var(--s-3); bottom: var(--s-3);
  background: rgba(0, 0, 0, .5); color: #fff;
  font-size: 12px; padding: 3px 10px; border-radius: var(--r-pill);
  backdrop-filter: blur(6px);
}
@keyframes float { 0%, 100% { transform: translateY(0) } 50% { transform: translateY(-12px) } }

.facts { display: flex; flex-wrap: wrap; gap: var(--s-3); margin-top: var(--s-6); }
.fact {
  flex: 1; min-width: 200px;
  padding: var(--s-4) var(--s-5);
  border: 1px solid var(--line); border-radius: var(--r-md);
  background: var(--surface);
}
.fact b { display: block; margin-bottom: var(--s-1); font-size: 15px; }
.fact span { color: var(--muted); font-size: 13px; }

/* ---------- 三步 ---------- */
.steps-l { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); }
.step-l { padding: var(--s-7) var(--s-7) 0 0; }
.step-l + .step-l { padding-left: var(--s-7); border-left: 1px solid var(--line); }
.step-l .num {
  font-size: 40px; font-weight: 800; line-height: 1; letter-spacing: -.04em;
  background: linear-gradient(180deg, rgba(255, 255, 255, .55), rgba(255, 255, 255, .08));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.step-l h3 { margin: var(--s-4) 0 var(--s-2); font-size: 17px; font-weight: 700; }
.step-l p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.85; }

/* ---------- FAQ ---------- */
#faq { display: flex; flex-direction: column; }
#faq > * { width: 100%; max-width: 760px; margin-left: auto; margin-right: auto; }
.faq-l { border-top: 1px solid var(--line); }
.faq-l details { border-bottom: 1px solid var(--line); padding: var(--s-5) 0; }
.faq-l summary {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s-5);
  font-size: 16px; font-weight: 650; list-style: none; cursor: pointer;
}
.faq-l summary::-webkit-details-marker { display: none; }
.faq-l summary::after { content: "+"; color: var(--muted); font-size: 20px; font-weight: 400; }
.faq-l details[open] summary::after { content: "−"; }
.faq-l p { margin: var(--s-3) 0 0; color: var(--muted); font-size: 14.5px; line-height: 1.9; }

/* ---------- 收尾 ---------- */
.final { position: relative; padding: 120px var(--s-6) 130px; text-align: center; overflow: hidden; border-top: 1px solid var(--line); }
.final::before {
  content: ""; position: absolute; inset: 0;
  background: radial-gradient(760px 420px at 50% 112%, rgba(139, 123, 255, .38), transparent 66%);
}
.final h2 { position: relative; margin: 0 0 var(--s-6); font-size: clamp(30px, 4.4vw, 52px); letter-spacing: -.03em; font-weight: 800; }
.final .btn { position: relative; }

.l-footer {
  display: flex; align-items: center; gap: var(--s-5); flex-wrap: wrap;
  padding: var(--s-6) var(--s-7);
  border-top: 1px solid var(--line);
  color: var(--muted); font-size: 13px;
}
.l-footer .spacer { flex: 1; }
.l-footer a { color: var(--muted); }
.l-footer a:hover { color: var(--text); }

/* ---------- 入场 ---------- */
[data-reveal] { opacity: 0; transform: translateY(22px); transition: opacity .8s ease, transform .8s cubic-bezier(.2, .7, .2, 1); }
[data-reveal].in { opacity: 1; transform: none; }

.section-l, .final { scroll-margin-top: 84px; }

@media (prefers-reduced-motion: reduce) {
  .strip-track, .phone-frame, .hero::before { animation: none; }
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

@media (max-width: 900px) {
  .l-header { height: 58px; padding: 0 var(--s-4); gap: var(--s-2); }
  .l-nav { display: none; }
  .hero { padding: 110px var(--s-5) 260px; }
  .hero p.lead { font-size: 15.5px; }
  .strip { width: 180%; height: 220px; }
  .strip-item { width: 120px; }
  .showcase { grid-template-columns: 1fr; gap: var(--s-7); }
  .phone-frame { width: 250px; }
  .steps-l { grid-template-columns: 1fr; }
  .step-l { padding: var(--s-5) 0 0 !important; border-left: 0 !important; }
  .step-l + .step-l { margin-top: var(--s-5); border-top: 1px solid var(--line); }
  .section-l { padding: 72px var(--s-5); }
}
@media (max-width: 560px) {
  .hero { padding: 104px var(--s-4) 235px; }
  .hero h1 { font-size: 42px; letter-spacing: -.02em; }
  .hero p.lead { font-size: 15px; line-height: 1.75; }
  .hero-cta { flex-direction: column; align-items: stretch; gap: 10px; }
  .hero-cta .btn { width: 100%; }
  .hero-meta { gap: var(--s-2) var(--s-4); }
  .strip { width: 230%; height: 200px; }
  .strip-item { width: 108px; }
  .showcase { gap: 34px; }
  .phone-frame { width: 230px; }
  .final { padding: 90px var(--s-4) 100px; }
  .l-footer { padding: var(--s-6) var(--s-4); }
}


@media (max-width: 560px) {
  /* 小屏上光斑占比更大，压一档，避免变成整块紫色底 */
  .landing::before { opacity: .72; }
  .hero::before { opacity: .8; }
}