/* Aivy OS 官网 —— 深色、克制、一个强调色。所有颜色与字号集中在这里。 */
:root {
  --bg: #0a0f1c;
  --bg-raise: #111827;
  --ink: #f4f6fa;
  --ink-2: rgba(232, 238, 248, 0.74);
  --ink-3: rgba(232, 238, 248, 0.5);
  --line: rgba(255, 255, 255, 0.08);
  --accent: #4fc3f7;
  --accent-soft: rgba(79, 195, 247, 0.16);
  --radius: 18px;
  --gutter: clamp(16px, 4vw, 48px);
  --maxw: 1180px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Microsoft YaHei UI",
    "Microsoft YaHei", "Noto Sans SC", "Segoe UI", sans-serif;
  color-scheme: dark;
}

*, *::before, *::after { box-sizing: border-box; }
html { background: var(--bg); -webkit-text-size-adjust: 100%; scroll-behavior: smooth; overflow-x: hidden; }
/* 环境光比视口宽：裁掉横向溢出，又不把页面变成滚动容器 */
@supports (overflow: clip) { html, body { overflow-x: clip; } }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, video { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { margin: 0; font-weight: 600; letter-spacing: -0.01em; }
p { margin: 0; }
h1, h2, h3, .lede { word-break: keep-all; overflow-wrap: anywhere; text-wrap: balance; }

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  height: 52px;
  display: flex;
  align-items: center;
  gap: 28px;
  padding: 0 var(--gutter);
  background: rgba(10, 15, 28, 0.86);
  backdrop-filter: saturate(160%) blur(18px);
  -webkit-backdrop-filter: saturate(160%) blur(18px);
  border-bottom: 1px solid var(--line);
  font-size: 13px;
}
.nav__brand { display: flex; align-items: center; gap: 8px; font-weight: 600; font-size: 15px; }
.nav__links { display: flex; gap: 22px; margin-left: auto; color: var(--ink-2); }
.nav__links a:hover { color: var(--ink); }
.nav__cta { padding: 5px 14px; border-radius: 999px; background: var(--ink); color: #000; font-weight: 600; }

/* ---------- 通用排版 ---------- */
.eyebrow { color: var(--accent); font-size: 15px; font-weight: 600; letter-spacing: 0.04em; margin-bottom: 14px; }
.lede { color: var(--ink-2); font-size: clamp(19px, 2.2vw, 26px); line-height: 1.45; }
.fineprint { color: var(--ink-3); font-size: 13px; margin-top: 18px; }
.cta-row { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; margin-top: 30px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 46px; padding: 0 24px; border-radius: 999px;
  font-size: 16px; font-weight: 600;
  transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}
.btn:active { transform: scale(0.98); }
.btn--primary { background: var(--accent); color: #031018; }
.btn--primary:hover { background: #7ad3fb; }
.btn--ghost { color: var(--accent); }
.btn--ghost:hover { color: #9adfff; }
.btn--ghost::after { content: "›"; margin-left: 6px; font-size: 20px; line-height: 1; }
.btn--large { min-height: 56px; padding: 0 34px; font-size: 18px; }

/* ---------- 开场：一打开就播，不用滚动 ---------- */
.hero { position: relative; padding: 132px var(--gutter) clamp(60px, 9vh, 110px); text-align: center; overflow: hidden; }
.stars { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; }
.hero > *:not(.stars) { position: relative; z-index: 1; }
.hero__mark { width: clamp(64px, 6vw, 84px); margin: 0 auto 22px; filter: drop-shadow(0 0 26px rgba(79, 195, 247, 0.45)); }
.hero h1 { font-size: clamp(44px, 7vw, 96px); line-height: 1.04; letter-spacing: -0.02em; }
.hero .lede { margin-top: 16px; }
.hero__film { margin-top: clamp(40px, 7vh, 72px); perspective: 2000px; }
.hero__film .film { transform-origin: 50% 0; }

/* 开场入场：依次淡入上浮；短片从微微后仰的角度落定（时间驱动，与滚动无关） */
@keyframes rise { from { opacity: 0; transform: translateY(26px); } to { opacity: 1; transform: none; } }
@keyframes land { from { opacity: 0; transform: translateY(60px) rotateX(18deg) scale(0.94); } to { opacity: 1; transform: none; } }
.hero__mark, .hero .eyebrow, .hero h1, .hero .lede, .hero .cta-row, .hero .fineprint { animation: rise 1.1s var(--ease) both; }
.hero .eyebrow { animation-delay: 0.08s; } .hero h1 { animation-delay: 0.16s; } .hero .lede { animation-delay: 0.28s; }
.hero .cta-row { animation-delay: 0.38s; } .hero .fineprint { animation-delay: 0.44s; }
.hero__film .film { animation: land 1.6s var(--ease) 0.5s both; }

/* ---------- 短片画框 ---------- */
.film {
  position: relative;
  width: min(1200px, 100%);
  margin: 0 auto;
  aspect-ratio: 16 / 10;
  border-radius: 20px;
  overflow: hidden;
  background: var(--bg);
  box-shadow: 0 50px 120px rgba(0, 0, 0, 0.6), 0 0 80px rgba(79, 195, 247, 0.07);
}
.film video { width: 100%; height: 100%; object-fit: cover; }
.film__play {
  position: absolute; left: 18px; bottom: 18px;
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(10, 14, 22, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--ink); cursor: pointer;
  display: grid; place-items: center;
  opacity: 0; transition: opacity 0.3s ease;
}
.film:hover .film__play, .film__play:focus-visible { opacity: 1; }
.film__play svg { width: 14px; height: 14px; fill: currentColor; }
.film__play .i-pause { display: none; }
.film.is-playing .film__play .i-play { display: none; }
.film.is-playing .film__play .i-pause { display: block; }

/* ---------- 功能一节：标题 → 短片 → 三张会动的卡片 ---------- */
.feature { max-width: var(--maxw); margin: 0 auto; padding: clamp(100px, 16vh, 180px) var(--gutter) 0; }
.feature__head { text-align: center; max-width: 820px; margin: 0 auto clamp(36px, 6vh, 64px); }
.feature__head h2 { font-size: clamp(36px, 5.4vw, 68px); line-height: 1.08; margin-bottom: 18px; }
.feature__head p { color: var(--ink-2); font-size: clamp(17px, 1.7vw, 21px); line-height: 1.6; }
.tiles { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: clamp(28px, 5vh, 48px); }
.tile {
  padding: 18px 20px 24px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.012));
  border: 1px solid var(--line);
}
.tile h3 { font-size: 20px; margin-bottom: 8px; }
.tile p { color: var(--ink-2); font-size: 15px; line-height: 1.65; }

.split { display: grid; grid-template-columns: 1.15fr 1fr; gap: clamp(28px, 4vw, 64px); align-items: center; margin-top: clamp(48px, 8vh, 90px); }
.split .film { border-radius: 16px; }
.split__copy h3 { font-size: clamp(22px, 2.4vw, 30px); line-height: 1.25; margin-bottom: 10px; }
.split__copy p { color: var(--ink-2); margin-bottom: 26px; }
.chips { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin: 0; }
.chips li { padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line); background: rgba(255, 255, 255, 0.03); color: var(--ink-2); font-size: 14px; }

/* ---------- 隐私 / 规格 / 下载 ---------- */
.privacy, .specs, .download { max-width: var(--maxw); margin: 0 auto; padding: clamp(100px, 16vh, 170px) var(--gutter) 0; }
.privacy { text-align: center; }
.privacy h2, .specs h2 { font-size: clamp(32px, 4.4vw, 56px); line-height: 1.1; margin-bottom: clamp(36px, 6vh, 60px); }
.privacy .tiles { text-align: left; }
.note { color: var(--ink-3); font-size: 14px; margin-top: 28px; }
.specs__table { margin: 0; border-top: 1px solid var(--line); }
.specs__table div { display: grid; grid-template-columns: 220px 1fr; gap: 24px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.specs__table dt { color: var(--ink-3); font-weight: 600; }
.specs__table dd { margin: 0; color: var(--ink); }
.download { text-align: center; padding-bottom: clamp(100px, 16vh, 180px); }
.download__mark { margin: 0 auto 28px; width: 96px; filter: drop-shadow(0 0 40px rgba(79, 195, 247, 0.35)); }
.download h2 { font-size: clamp(36px, 5.4vw, 72px); line-height: 1.08; margin-bottom: 16px; }

.footer {
  display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap;
  max-width: var(--maxw); margin: 0 auto; padding: 28px var(--gutter) 40px;
  border-top: 1px solid var(--line); color: var(--ink-3); font-size: 13px;
}
.footer__brand { display: flex; align-items: center; gap: 8px; color: var(--ink-2); font-weight: 600; }

/* 进入视口时淡入（site.js 加 .is-in） */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 1s var(--ease), transform 1s var(--ease); }
.reveal.is-in { opacity: 1; transform: none; }
.tiles .reveal:nth-child(2) { transition-delay: 0.08s; }
.tiles .reveal:nth-child(3) { transition-delay: 0.16s; }

@media (max-width: 1120px) {
  .nav__links { display: none; }
  .nav__cta { margin-left: auto; }
}
@media (max-width: 820px) {
  .hero { padding-top: 104px; }
  .hero h1 { font-size: clamp(30px, 9.4vw, 44px); }
  .tiles { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; }
  .film { border-radius: 12px; }
  .film__play { opacity: 1; }
  .specs__table div { grid-template-columns: 1fr; gap: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero__mark, .hero .eyebrow, .hero h1, .hero .lede, .hero .cta-row, .hero .fineprint, .hero__film .film { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .film__play { opacity: 1; }
}

/* ---------- 底色与环境光（2026-10-02：整页别一片死黑，跟着功能换一点颜色） ---------- */
body {
  background:
    radial-gradient(1400px 900px at 50% -8%, rgba(79, 195, 247, 0.13), transparent 62%),
    radial-gradient(900px 700px at 85% 18%, rgba(120, 100, 255, 0.07), transparent 65%),
    var(--bg);
}
.feature { position: relative; isolation: isolate; }
.feature::before {
  content: "";
  position: absolute;
  z-index: -1;
  left: 50%;
  top: 18%;
  width: 150vw;
  height: 78%;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, rgba(var(--glow), 0.30), rgba(var(--glow), 0.10) 50%, transparent 80%);
  filter: blur(40px);
  pointer-events: none;
}
#do { --glow: 79, 195, 247; }
#voice { --glow: 150, 120, 255; }
#computer { --glow: 79, 195, 247; }
#code { --glow: 90, 220, 150; }
#memory { --glow: 255, 184, 107; }
#wiki { --glow: 255, 211, 107; }
#persona { --glow: 255, 128, 170; }
#proactive { --glow: 79, 195, 247; }
#team { --glow: 150, 120, 255; }
#models { --glow: 79, 195, 247; }
.film { box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.08), 0 50px 120px rgba(0, 0, 0, 0.5), 0 0 90px rgba(79, 195, 247, 0.08); }
.feature .film { box-shadow: 0 0 0 1px rgba(var(--glow), 0.22), 0 40px 110px rgba(0, 0, 0, 0.45), 0 0 120px rgba(var(--glow), 0.20); }

/* 浅色区块：隐私 + 规格。卡片里的小动画保持深色，像摆在浅色桌面上的小屏幕 */
.band--light {
  margin-top: clamp(100px, 16vh, 170px);
  padding-bottom: clamp(90px, 14vh, 150px);
  background: #f5f6f8;
  color: #1d1d1f;
}
.band--light .privacy, .band--light .specs { padding-top: clamp(90px, 14vh, 150px); }
.band--light .eyebrow { color: #0a84c6; }
.band--light .tile { background: #fff; border-color: rgba(0, 0, 0, 0.07); box-shadow: 0 18px 40px rgba(16, 24, 40, 0.06); }
.band--light .tile h3 { color: #1d1d1f; }
.band--light .tile p, .band--light .note { color: #6e6e73; }
.band--light .art { background: radial-gradient(120% 90% at 50% 0%, rgba(79, 195, 247, 0.16), transparent 60%), #0b1120; border-color: rgba(0, 0, 0, 0.1); }
.band--light .specs__table, .band--light .specs__table div { border-color: rgba(0, 0, 0, 0.1); }
.band--light .specs__table dt { color: #6e6e73; }
.band--light .specs__table dd { color: #1d1d1f; }

/* ---------- 三幕的大标题 ---------- */
.act { max-width: var(--maxw); margin: 0 auto; padding: clamp(130px, 22vh, 240px) var(--gutter) 0; text-align: center; }
.act__kicker {
  width: 54px; height: 54px; margin: 0 auto 26px; border-radius: 50%;
  display: grid; place-items: center;
  border: 1px solid rgba(79, 195, 247, 0.35); color: var(--accent);
  font-size: 15px; font-weight: 600; letter-spacing: 0.06em; box-shadow: 0 0 40px rgba(79, 195, 247, 0.18);
}
.act__title {
  font-size: clamp(52px, 9vw, 128px); line-height: 1; letter-spacing: -0.03em;
  background: linear-gradient(180deg, #ffffff 30%, rgba(160, 205, 235, 0.75));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.act__lede { margin: 24px auto 0; max-width: 760px; color: var(--ink-2); font-size: clamp(18px, 2vw, 24px); line-height: 1.55; word-break: keep-all; text-wrap: balance; }

/* ---------- 还有更多 ---------- */
.more { max-width: var(--maxw); margin: 0 auto; padding: clamp(110px, 18vh, 190px) var(--gutter) 0; }
.more__title { font-size: clamp(36px, 5vw, 64px); line-height: 1.08; margin-bottom: clamp(36px, 6vh, 60px); text-align: center; }
.more__grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.more__item { padding: 24px 22px 26px; border-radius: var(--radius); border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.04), rgba(255, 255, 255, 0.012)); }
.more__icon { width: 30px; height: 30px; margin-bottom: 16px; fill: none; stroke: var(--accent); stroke-width: 1.6;
  stroke-linecap: round; stroke-linejoin: round; filter: drop-shadow(0 0 8px rgba(79, 195, 247, 0.35)); }
.more__item h3 { font-size: 18px; margin-bottom: 8px; }
.more__item p { color: var(--ink-2); font-size: 14.5px; line-height: 1.65; }

/* ---------- 页脚链接 ---------- */
.footer__links { display: flex; gap: 22px; flex-wrap: wrap; }
.footer__links a { color: var(--ink-2); }
.footer__links a:hover { color: var(--ink); }

@media (max-width: 1100px) { .more__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { .more__grid { grid-template-columns: 1fr; } }

/* ---------- 2026-10-02 技能一节、为每一个人、补齐的卡片 ---------- */
#skills { --glow: 90, 200, 255; }
.tiles--four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.tiles--one { grid-template-columns: minmax(0, 440px); justify-content: center; }
.tiles-note { max-width: 760px; margin: 22px auto 0; text-align: center; color: var(--ink-3); font-size: 13.5px; line-height: 1.7; }
.privacy--four .tiles { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.alt-dl { color: var(--accent); }
.alt-dl:hover { text-decoration: underline; text-underline-offset: 3px; }

.everyone { position: relative; isolation: isolate; max-width: var(--maxw); margin: 0 auto; padding: clamp(110px, 18vh, 190px) var(--gutter) 0; }
.everyone::before { content: ""; position: absolute; z-index: -1; left: 50%; top: 10%; width: 140vw; height: 80%; transform: translateX(-50%);
  background: radial-gradient(closest-side, rgba(255, 184, 107, .16), rgba(150, 120, 255, .07) 55%, transparent 80%); filter: blur(40px); pointer-events: none; }
.everyone__grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px; }
.story { display: flex; flex-direction: column; border-radius: 20px; overflow: hidden; background: var(--bg-raise); border: 1px solid var(--line);
  box-shadow: 0 30px 70px rgba(0, 0, 0, .35); }
.story__photo { position: relative; margin: 0; aspect-ratio: 16 / 10; overflow: hidden; }
.story__photo img { width: 100%; height: 100%; object-fit: cover; transform: scale(1.06); transition: transform 2.4s var(--ease); }
.story.is-in .story__photo img { transform: scale(1); }
.story__photo::after { content: ""; position: absolute; inset: -1px; background: linear-gradient(180deg, transparent 45%, var(--bg-raise) 99%); }
.story__body { position: relative; display: flex; flex-direction: column; flex: 1; padding: 0 24px 26px; margin-top: -34px; }
.story__who { align-self: flex-start; font-size: 12.5px; font-weight: 600; letter-spacing: .06em; color: #031018; background: var(--accent); padding: 3px 10px; border-radius: 999px; margin-bottom: 12px; }
.story h3 { font-size: 22px; line-height: 1.3; margin-bottom: 14px; }
.story__beats { list-style: none; margin: 0 0 16px; padding: 0; counter-reset: beat; }
.story__beats li { position: relative; counter-increment: beat; padding: 7px 0 7px 30px; color: var(--ink-2); font-size: 15px; line-height: 1.55;
  opacity: 0; transform: translateY(8px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.story__beats li::before { content: counter(beat); position: absolute; left: 0; top: 8px; width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center;
  font-size: 11px; font-weight: 600; color: var(--accent); border: 1px solid rgba(79, 195, 247, .45); }
.story.is-in .story__beats li { opacity: 1; transform: none; }
.story.is-in .story__beats li:nth-child(1) { transition-delay: .35s; }
.story.is-in .story__beats li:nth-child(2) { transition-delay: .75s; }
.story.is-in .story__beats li:nth-child(3) { transition-delay: 1.15s; }
.story__payoff { margin-top: auto; padding-top: 14px; border-top: 1px solid var(--line); font-weight: 600; color: var(--ink); opacity: 0; transition: opacity .8s var(--ease) 1.6s; }
.story.is-in .story__payoff { opacity: 1; }

@media (max-width: 1100px) {
  .everyone__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 820px) {
  .tiles--four, .privacy--four .tiles { grid-template-columns: 1fr; }
  .everyone__grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) {
  .story__beats li, .story__payoff { opacity: 1; transform: none; transition: none; }
  .story__photo img { transform: none; transition: none; }
}

/* ---------- 2026-10-03 「我是艾薇」：艾薇自己写给每个人的一段话（规格之后、下载之前） ---------- */
.letter { position: relative; isolation: isolate; max-width: var(--maxw); margin: 0 auto; padding: clamp(130px, 22vh, 240px) var(--gutter) 0; text-align: center; }
.letter::before { content: ""; position: absolute; z-index: -1; left: 50%; top: 4%; width: 120vw; height: 92%; transform: translateX(-50%);
  background:
    radial-gradient(closest-side at 50% 18%, rgba(79, 195, 247, .20), transparent 70%),
    radial-gradient(closest-side at 50% 70%, rgba(150, 120, 255, .10), transparent 75%);
  filter: blur(30px); pointer-events: none; }
.letter__orb { position: relative; width: 64px; height: 64px; margin: 0 auto 38px; }
.letter__orb span { position: absolute; inset: 0; border-radius: 50%;
  background: radial-gradient(circle at 38% 34%, #ffffff 0%, #bfeaff 18%, #4fc3f7 46%, rgba(79, 195, 247, .25) 72%, transparent 76%);
  box-shadow: 0 0 46px rgba(79, 195, 247, .55), 0 0 120px rgba(150, 120, 255, .25); animation: letter-glow 5.2s ease-in-out infinite; }
.letter__orb::before { content: ""; position: absolute; inset: -20px; border-radius: 50%; border: 1px solid rgba(79, 195, 247, .25);
  animation: letter-breathe 5.2s ease-in-out infinite; }
@keyframes letter-breathe { 0%, 100% { transform: scale(.92); opacity: .35; } 50% { transform: scale(1.08); opacity: .9; } }
@keyframes letter-glow { 0%, 100% { transform: scale(.96); filter: brightness(.92); } 50% { transform: scale(1.03); filter: brightness(1.08); } }
.letter .eyebrow { margin-bottom: 18px; }
.letter__title { font-size: clamp(44px, 7vw, 96px); line-height: 1.06; letter-spacing: -0.03em; word-break: keep-all;
  background: linear-gradient(180deg, #ffffff 30%, rgba(160, 205, 235, .75)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.letter__body { max-width: 760px; margin: clamp(44px, 7vh, 72px) auto 0; }
.letter__line { color: var(--ink-2); font-size: clamp(19px, 2.1vw, 25px); line-height: 1.7; word-break: keep-all; text-wrap: balance; }
.letter__line + .letter__line { margin-top: clamp(14px, 2.2vh, 22px); }
.letter__line.is-gap { margin-top: clamp(30px, 5vh, 48px); }
.letter__line.is-strong { color: var(--ink); }
.letter__body .reveal:nth-child(2) { transition-delay: .08s; } .letter__body .reveal:nth-child(3) { transition-delay: .16s; }
.letter__body .reveal:nth-child(5) { transition-delay: .28s; } .letter__body .reveal:nth-child(6) { transition-delay: .4s; }
.letter__body .reveal:nth-child(8) { transition-delay: .1s; }
.letter__closing { margin-top: clamp(40px, 6vh, 64px); color: var(--ink); font-size: clamp(24px, 3vw, 38px); font-weight: 600; line-height: 1.4; letter-spacing: -0.01em; word-break: keep-all; text-wrap: balance; }
.letter__sign { display: inline-flex; align-items: center; gap: 14px; margin-top: clamp(30px, 5vh, 46px); color: var(--ink-2); font-size: 17px; letter-spacing: .12em; }
.letter__sign::before { content: ""; width: 44px; height: 1px; background: linear-gradient(90deg, transparent, rgba(79, 195, 247, .8)); }
.letter__sign b { color: var(--ink); font-weight: 600; letter-spacing: .18em; }
@media (prefers-reduced-motion: reduce) {
  .letter__orb::before, .letter__orb span { animation: none; }
  .letter__orb::before { opacity: .6; }
}

/* ---------- 2026-10-03 第二章分隔改为「对话列表，Aivy OS 没有。」（数字生命）；隐私第 4 张卡；个性节「她，也可以是他」 ---------- */
.act--life .act__lede { max-width: 820px; }
.art .row .na { margin-left: auto; color: var(--c); font-weight: 600; font-size: 11.5px; letter-spacing: .04em; }
.persona-line { display: block; margin-top: 6px; color: var(--ink); }
@media (max-width: 480px) { .act--life .act__title { font-size: 44px; } }

/* ---------- 2026-10-03 模块之间的动态分割线：从中间画开，一束光沿线走过，中间光点呼吸 ---------- */
.sep { max-width: var(--maxw); margin: clamp(96px, 15vh, 170px) auto 0; padding: 0 var(--gutter); display: flex; align-items: center; gap: 18px;
  font: 600 11.5px/1 ui-monospace, "SF Mono", "Cascadia Mono", Consolas, monospace; letter-spacing: .2em; color: var(--ink-2); }
.sep.reveal { transform: none; }
.sep__l, .sep__r { white-space: nowrap; opacity: 0; transition: opacity .9s var(--ease) .7s; }
.sep__l::before { content: ""; display: inline-block; width: 6px; height: 6px; margin-right: 10px; border-radius: 50%; vertical-align: 1px;
  background: var(--accent); box-shadow: 0 0 10px rgba(79, 195, 247, .8); }
.sep__line { position: relative; flex: 1; height: 1px; transform: scaleX(0); transition: transform 1.5s var(--ease);
  background: linear-gradient(90deg, transparent, rgba(79, 195, 247, .85) 16%, rgba(150, 120, 255, .7) 84%, transparent); }
.sep__line::before { content: ""; position: absolute; left: 10%; right: 10%; top: -14px; height: 29px; pointer-events: none;
  background: radial-gradient(closest-side, rgba(79, 195, 247, .28), rgba(150, 120, 255, .08) 60%, transparent); filter: blur(4px); }
.sep__beam { position: absolute; top: -1px; left: -26%; width: 26%; height: 3px; border-radius: 2px; opacity: 0;
  background: linear-gradient(90deg, transparent, rgba(220, 248, 255, 1) 70%, transparent); box-shadow: 0 0 18px 2px rgba(79, 195, 247, .9), 0 0 42px rgba(150, 120, 255, .5);
  animation: sep-beam 7s cubic-bezier(.45, 0, .2, 1) 1.6s infinite; animation-play-state: paused; }
.sep__node { position: absolute; left: 50%; top: 50%; width: 9px; height: 9px; margin: -4.5px 0 0 -4.5px; border-radius: 50%; background: #c8eeff;
  box-shadow: 0 0 0 4px rgba(79, 195, 247, .14), 0 0 18px rgba(79, 195, 247, .85); opacity: 0; transition: opacity .6s ease .9s;
  animation: sep-node 3.4s ease-in-out infinite; }
.sep.is-in .sep__line { transform: scaleX(1); }
.sep.is-in .sep__l, .sep.is-in .sep__r, .sep.is-in .sep__node { opacity: 1; }
.sep.is-in .sep__beam { animation-play-state: running; }
@keyframes sep-beam { 0% { left: -26%; opacity: 0; } 6% { opacity: 1; } 58% { left: 100%; opacity: 1; } 60%, 100% { left: 100%; opacity: 0; } }
@keyframes sep-node { 0%, 100% { box-shadow: 0 0 0 4px rgba(79, 195, 247, .14), 0 0 14px rgba(79, 195, 247, .7); }
  50% { box-shadow: 0 0 0 9px rgba(79, 195, 247, .06), 0 0 26px rgba(79, 195, 247, 1); } }
.sep + .feature, .sep + .everyone, .sep + .more { padding-top: clamp(56px, 9vh, 104px); }
@media (max-width: 640px) {
  .sep { gap: 12px; font-size: 10.5px; letter-spacing: .14em; }
}
@media (prefers-reduced-motion: reduce) {
  .sep__line { transform: none; transition: none; }
  .sep__beam { display: none; }
  .sep__node { animation: none; }
  .sep__l, .sep__r, .sep__node { opacity: 1; transition: none; }
}

/* ---------- 2026-10-03 实景层次：每节一条通栏实景照片垫在标题区后面（压暗、四边渐隐、滚动视差），标题压在照片上，短片上沿叠住照片下沿 ---------- */
.feature > .scene { position: absolute; z-index: -1; left: 50%; top: 0; width: 100vw; max-width: 1920px; height: clamp(560px, 76vh, 780px); margin: 0;
  pointer-events: none; overflow: hidden; transform: translateX(-50%);
  -webkit-mask-image: linear-gradient(180deg, transparent 0%, #000 16%, #000 56%, transparent 96%), linear-gradient(90deg, transparent 0%, #000 16%, #000 84%, transparent 100%);
  -webkit-mask-composite: source-in;
  mask-image: linear-gradient(180deg, transparent 0%, #000 16%, #000 56%, transparent 96%), linear-gradient(90deg, transparent 0%, #000 16%, #000 84%, transparent 100%);
  mask-composite: intersect; }
.feature > .scene.reveal, .feature > .scene.reveal.is-in { transform: translateX(-50%); }
.feature > .scene.reveal { opacity: 0; transition: opacity 1.8s var(--ease); }
.feature > .scene.reveal.is-in { opacity: 1; }
.feature > .scene img { width: 100%; height: 100%; object-fit: cover; display: block; filter: brightness(.78) saturate(.95); transform: translateY(var(--py, 0px)) scale(1.16); }
.feature > .scene::after { content: ""; position: absolute; inset: 0;
  background: radial-gradient(46% 38% at 50% 30%, rgba(10, 15, 28, .62), rgba(10, 15, 28, .18) 72%, transparent),
    radial-gradient(60% 60% at 50% 70%, rgba(var(--glow, 79, 195, 247), .14), transparent 70%); }
.feature > .scene ~ .feature__head h2, .feature > .scene ~ .feature__head p { text-shadow: 0 2px 24px rgba(4, 8, 18, .65); }
@media (max-width: 820px) {
  .feature > .scene { top: 56px; height: 440px; }
}
@media (prefers-reduced-motion: reduce) {
  .feature > .scene img { transform: scale(1.16); }
}
#team > .scene img { object-position: 50% 18%; }
#computer > .scene img { filter: brightness(1.15) saturate(1); }