/* ============================================================
   OpenIM 官网样式 v3 · 深浅色双主题 + 悬浮毛玻璃导航 + Bento 布局
   ============================================================ */

:root {
  --bg: #f5f7fb;
  --bg-soft: #edf1f7;
  --card: #ffffff;
  --card-border: #e2e8f2;
  --card-border-hover: #b9cdf0;
  --text: #16233a;
  --muted: #5d6f88;
  --faint: #8b9ab1;
  --line: #e3e9f2;
  --accent: #2f6bff;
  --accent-strong: #1e54d8;
  --accent-soft: #e9f0ff;
  --cyan: #12b5cb;
  --violet: #7a6bff;
  --nav-bg: rgba(255, 255, 255, .72);
  --nav-border: rgba(255, 255, 255, .65);
  --nav-shadow: 0 8px 30px rgba(22, 42, 84, .1);
  --card-shadow: 0 10px 28px rgba(22, 42, 84, .07);
  --card-shadow-hover: 0 18px 42px rgba(22, 42, 84, .12);
  --meta-bg: #f0f4fa;
  --hero-ink: #16233a;
  --hero-muted: #5d6f88;
  --hero-bg: linear-gradient(160deg, #eef3fb 0%, #f6f9ff 45%, #eef0fe 100%);
  --panel-bg: linear-gradient(150deg, #16233c, #0b1526 65%);
  --panel-border: rgba(148, 197, 255, .25);
  --panel-text: rgba(226, 239, 255, .8);
  --ease: cubic-bezier(.22, .61, .36, 1);
}

html[data-theme="dark"] {
  --bg: #0b1220;
  --bg-soft: #0e1728;
  --card: #121c30;
  --card-border: #22304a;
  --card-border-hover: #33507f;
  --text: #e7eef9;
  --muted: #93a3bd;
  --faint: #6c7d99;
  --line: #1e2c46;
  --accent: #5b8cff;
  --accent-strong: #7aa3ff;
  --accent-soft: rgba(91, 140, 255, .14);
  --cyan: #2fd4c5;
  --violet: #9d8bff;
  --nav-bg: rgba(13, 21, 38, .66);
  --nav-border: rgba(120, 160, 230, .18);
  --nav-shadow: 0 10px 34px rgba(0, 0, 0, .45);
  --card-shadow: 0 12px 30px rgba(0, 0, 0, .35);
  --card-shadow-hover: 0 20px 44px rgba(0, 0, 0, .5);
  --meta-bg: rgba(255, 255, 255, .06);
  --hero-ink: #e7eef9;
  --hero-muted: #93a3bd;
  --hero-bg: linear-gradient(160deg, #0b1322 0%, #0d1830 48%, #101430 100%);
  --panel-bg: linear-gradient(150deg, #142138, #0b1526 65%);
  --panel-border: rgba(120, 170, 245, .28);
  --panel-text: rgba(226, 239, 255, .8);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; background: var(--bg); }
body {
  margin: 0; color: var(--text); background: var(--bg);
  font: 15px/1.65 Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased; overflow-x: hidden;
  transition: background .35s, color .35s;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
::selection { background: color-mix(in oklab, var(--accent) 22%, transparent); }

.site-progress { position: fixed; inset: 0 0 auto; z-index: 100; height: 3px; pointer-events: none; }
.site-progress span { display: block; width: 0; height: 100%; background: linear-gradient(90deg, var(--cyan), var(--accent), var(--violet)); }

/* ---------- 悬浮毛玻璃导航 ---------- */
.site-header {
  position: fixed; z-index: 50; top: 14px; left: 50%; transform: translateX(-50%);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  width: min(1180px, calc(100% - 28px)); height: 64px; padding: 0 12px 0 20px;
  border: 1px solid var(--nav-border); border-radius: 20px;
  color: var(--text); background: var(--nav-bg);
  -webkit-backdrop-filter: blur(22px) saturate(1.6); backdrop-filter: blur(22px) saturate(1.6);
  box-shadow: var(--nav-shadow);
  transition: background .35s, border-color .35s, box-shadow .35s, height .3s var(--ease);
}
.site-header.is-scrolled { height: 58px; background: color-mix(in srgb, var(--nav-bg) 82%, var(--card)); box-shadow: 0 14px 40px rgba(10, 25, 55, .16); }
html[data-theme="dark"] .site-header.is-scrolled { box-shadow: 0 14px 40px rgba(0, 0, 0, .55); }
.site-brand { display: inline-flex; align-items: center; gap: 11px; }
.brand-mark { display: grid; place-items: center; width: 36px; height: 36px; border: 1px solid var(--nav-border); border-radius: 11px; background: color-mix(in srgb, var(--card) 55%, transparent); }
.brand-mark img { width: 22px; height: 22px; object-fit: contain; }
.brand-copy { display: grid; }
.brand-copy strong { font-size: 17px; line-height: 1.1; letter-spacing: -.02em; }
.brand-copy small { color: var(--faint); font-size: 8px; letter-spacing: .2em; }
.site-nav { display: flex; align-items: center; gap: 6px; color: var(--muted); font-size: 13.5px; }
.site-nav > a { padding: 8px 14px; border-radius: 10px; transition: color .25s, background .25s; }
.site-nav > a:hover { color: var(--text); background: color-mix(in srgb, var(--accent) 9%, transparent); }
.site-nav > a.is-active { color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.header-actions { display: flex; align-items: center; gap: 8px; }
.theme-toggle {
  display: grid; place-items: center; width: 38px; height: 38px;
  border: 1px solid var(--card-border); border-radius: 11px;
  color: var(--muted); background: transparent;
  transition: color .25s, border-color .25s, background .25s, transform .25s;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); transform: rotate(15deg); }
.theme-toggle .icon-sun, .theme-toggle .icon-moon { display: none; font-size: 16px; line-height: 1; }
html[data-theme="light"] .theme-toggle .icon-sun { display: block; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
.nav-admin {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 9px 16px; border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent);
  border-radius: 12px; color: var(--accent); background: var(--accent-soft); font-weight: 600;
  transition: background .25s, border-color .25s, transform .25s;
}
.nav-admin b { font-size: 15px; font-weight: 400; }
.nav-admin:hover { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 14%, transparent); transform: translateY(-1px); }
.mobile-menu { display: none; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; min-height: min(920px, 100vh); color: var(--hero-ink); background: var(--hero-bg); }
.hero::after { position: absolute; inset: auto 0 0; height: 140px; content: ""; background: linear-gradient(180deg, transparent, var(--bg)); pointer-events: none; }
.hero-grid-lines {
  position: absolute; inset: 0; opacity: .5;
  background-image: linear-gradient(color-mix(in oklab, var(--accent) 9%, transparent) 1px, transparent 1px), linear-gradient(90deg, color-mix(in oklab, var(--accent) 9%, transparent) 1px, transparent 1px);
  background-size: 88px 88px;
  mask-image: linear-gradient(90deg, #000, transparent 82%);
}
.hero-orbit { position: absolute; border: 1px solid color-mix(in oklab, var(--accent) 20%, transparent); border-radius: 50%; pointer-events: none; animation: orbit-drift 16s ease-in-out infinite alternate; }
.hero-orbit-one { top: -30vw; right: -10vw; width: 74vw; height: 74vw; box-shadow: 0 0 160px color-mix(in oklab, var(--accent) 14%, transparent); }
.hero-orbit-two { right: 22vw; bottom: -38vw; width: 64vw; height: 64vw; border-color: color-mix(in oklab, var(--cyan) 18%, transparent); animation-delay: -6s; }
.hero-inner { position: relative; z-index: 2; display: grid; grid-template-columns: minmax(0, .92fr) minmax(430px, 1.08fr); align-items: center; gap: clamp(30px, 6vw, 100px); width: min(1260px, calc(100% - 48px)); min-height: min(920px, 100vh); margin: 0 auto; padding: 150px 0 100px; }
.hero-copy { max-width: 620px; }
.eyebrow, .section-index { display: inline-flex; align-items: center; gap: 9px; color: var(--accent); font-size: 10px; font-weight: 700; letter-spacing: .17em; }
.eyebrow-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 0 5px color-mix(in srgb, var(--cyan) 16%, transparent), 0 0 18px var(--cyan); animation: pulse 2.2s ease-in-out infinite; }
.hero h1 { margin: 26px 0 22px; font-size: clamp(46px, 5.6vw, 76px); font-weight: 650; line-height: 1.08; letter-spacing: -.03em; }
h1 em, h2 em { color: transparent; font-style: normal; background: linear-gradient(95deg, var(--cyan) 5%, var(--accent) 50%, var(--violet) 95%); -webkit-background-clip: text; background-clip: text; }
.hero-lead { max-width: 530px; margin: 0; color: var(--hero-muted); font-size: 16px; line-height: 1.9; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 13px; margin-top: 34px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 11px; min-height: 48px; padding: 0 22px; border: 1px solid transparent; border-radius: 12px; font-size: 13.5px; font-weight: 600; transition: transform .25s var(--ease), box-shadow .25s, background .25s, border-color .25s; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: #fff; background: linear-gradient(100deg, var(--accent), var(--accent-strong)); box-shadow: 0 12px 30px color-mix(in srgb, var(--accent) 30%, transparent); }
.button-primary:hover { box-shadow: 0 16px 36px color-mix(in srgb, var(--accent) 42%, transparent); }
.button-ghost { color: var(--text); border-color: var(--card-border); background: color-mix(in srgb, var(--card) 70%, transparent); }
.button-ghost:hover { border-color: var(--accent); background: var(--accent-soft); }
.button-play { display: grid; place-items: center; width: 22px; height: 22px; border-radius: 50%; color: var(--accent); background: var(--accent-soft); font-size: 8px; }
.hero-proof { display: flex; flex-wrap: wrap; gap: 22px; margin-top: 42px; color: var(--hero-muted); font-size: 11.5px; }
.hero-proof span { display: inline-flex; align-items: center; gap: 8px; }
.proof-icon { display: grid; place-items: center; width: 20px; height: 20px; border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent); border-radius: 6px; color: var(--accent); background: var(--accent-soft); font-style: normal; font-size: 11px; }

.hero-visual { position: relative; min-height: 510px; perspective: 1000px; }
.visual-glow { position: absolute; inset: 20% 8% 8%; border-radius: 50%; background: radial-gradient(ellipse, color-mix(in srgb, var(--accent) 30%, transparent), transparent 68%); filter: blur(22px); }
.visual-panel { position: absolute; inset: 42px 20px 32px 0; overflow: hidden; border: 1px solid var(--panel-border); border-radius: 22px; background: var(--panel-bg); box-shadow: 26px 32px 70px rgba(4, 14, 32, .38), inset 0 1px 0 rgba(255, 255, 255, .12); transform: rotateY(-6deg) rotateX(3deg); animation: panel-float 7s ease-in-out infinite; -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); }
.visual-panel::before { position: absolute; inset: 0; content: ""; opacity: .22; background-image: linear-gradient(rgba(154, 207, 255, .16) 1px, transparent 1px), linear-gradient(90deg, rgba(154, 207, 255, .16) 1px, transparent 1px); background-size: 36px 36px; mask-image: radial-gradient(circle at 50% 50%, #000, transparent 76%); }
.visual-topline, .visual-footer { position: relative; z-index: 2; display: flex; align-items: center; justify-content: space-between; padding: 22px 24px; color: var(--panel-text); font-size: 8px; letter-spacing: .1em; opacity: .75; }
.traffic { display: flex; gap: 5px; }
.traffic i { width: 6px; height: 6px; border-radius: 50%; background: rgba(255, 255, 255, .28); }
.traffic i:first-child { background: #ff7b86; }
.traffic i:nth-child(2) { background: #ffca6c; }
.traffic i:last-child { background: #75dfb0; }
.visual-signal { color: #6ce4b4; font-size: 8px; }
.visual-center { position: absolute; inset: 82px 0 70px; display: grid; place-items: center; }
.connection-ring { position: absolute; border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent); border-radius: 50%; }
.connection-ring-outer { width: 285px; height: 285px; border-style: dashed; animation: spin 24s linear infinite; }
.connection-ring-inner { width: 185px; height: 185px; border-color: color-mix(in srgb, var(--cyan) 55%, transparent); box-shadow: 0 0 55px color-mix(in srgb, var(--accent) 25%, transparent); animation: spin-reverse 17s linear infinite; }
.connection-core { position: relative; z-index: 2; display: grid; place-items: center; width: 110px; height: 110px; border: 1px solid color-mix(in srgb, var(--accent) 55%, transparent); border-radius: 28px; background: linear-gradient(135deg, color-mix(in srgb, var(--accent) 80%, transparent), color-mix(in srgb, var(--cyan) 45%, transparent)); box-shadow: 0 0 0 12px color-mix(in srgb, var(--accent) 7%, transparent), 0 20px 50px color-mix(in srgb, var(--accent) 38%, transparent); animation: core-breathe 4s ease-in-out infinite; }
.connection-core img { width: 48px; height: 48px; object-fit: contain; filter: brightness(0) invert(1); }
.connection-core span { margin-top: -14px; color: rgba(255, 255, 255, .82); font-size: 8px; letter-spacing: .2em; }
.node { position: absolute; z-index: 3; display: grid; place-items: center; width: 55px; height: 55px; border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent); border-radius: 16px; color: var(--panel-text); background: color-mix(in srgb, var(--accent) 16%, rgba(10, 22, 44, .55)); box-shadow: 0 8px 24px rgba(0, 0, 0, .2); font-size: 10px; }
.node-a { top: 18%; left: 17%; }
.node-b { top: 23%; right: 15%; }
.node-c { right: 13%; bottom: 20%; }
.node-d { bottom: 16%; left: 16%; }
.visual-footer { position: absolute; right: 0; bottom: 0; left: 0; border-top: 1px solid rgba(148, 197, 255, .14); }
.visual-footer span { display: grid; gap: 2px; }
.visual-footer b { color: #d8ecff; font-size: 14px; font-weight: 500; letter-spacing: 0; }
.visual-footer small { color: rgba(206, 228, 249, .5); font-size: 8px; letter-spacing: 0; }
.floating-card { position: absolute; z-index: 5; display: flex; align-items: center; gap: 10px; padding: 12px 15px; border: 1px solid var(--panel-border); border-radius: 14px; color: #fff; background: rgba(13, 30, 58, .72); box-shadow: 0 15px 32px rgba(0, 0, 0, .25); -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px); animation: card-float 5.4s ease-in-out infinite; }
.floating-card-top { top: 5px; right: -7px; }
.floating-card-bottom { bottom: 5px; left: -26px; animation-delay: -2.2s; }
.floating-icon { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 9px; color: var(--cyan); background: color-mix(in srgb, var(--cyan) 16%, transparent); font-size: 18px; }
.floating-card b, .floating-card small { display: block; }
.floating-card b { font-size: 11px; font-weight: 600; }
.floating-card small { margin-top: 1px; color: rgba(210, 231, 251, .5); font-size: 9px; }
.avatar-stack { display: flex; padding-left: 5px; }
.avatar-stack i { display: grid; place-items: center; width: 27px; height: 27px; margin-left: -5px; border: 2px solid #122743; border-radius: 50%; color: #eaf9ff; background: linear-gradient(140deg, #69c7ff, #7774ff); font-size: 8px; font-style: normal; }
.avatar-stack i:nth-child(2) { background: linear-gradient(140deg, #ff9c9c, #c46aff); }
.avatar-stack i:nth-child(3) { color: #6ce9ef; background: #133451; }
.hero-scroll { position: absolute; z-index: 5; bottom: 46px; left: 50%; display: inline-flex; align-items: center; gap: 12px; color: var(--hero-muted); font-size: 10px; letter-spacing: .1em; transform: translateX(-50%); }
.hero-scroll i { display: grid; place-items: center; width: 31px; height: 31px; border: 1px solid var(--card-border); border-radius: 50%; color: var(--accent); font-style: normal; animation: scroll-bob 1.7s ease-in-out infinite; }

/* ---------- 跑马灯 ---------- */
.marquee-strip { position: relative; z-index: 3; margin-top: -1px; overflow: hidden; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); color: var(--muted); background: var(--bg-soft); }
.marquee-track { display: flex; align-items: center; gap: 34px; width: max-content; min-height: 56px; padding: 0 20px; animation: marquee 28s linear infinite; font-size: 10px; font-weight: 700; letter-spacing: .2em; }
.marquee-track b { color: var(--accent); font-size: 14px; }

/* ---------- 统计带 ---------- */
.stats-band {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  width: min(1180px, calc(100% - 48px)); margin: 70px auto 0;
  padding: 26px clamp(20px, 4vw, 46px);
  border: 1px solid var(--card-border); border-radius: 20px;
  background: color-mix(in srgb, var(--card) 60%, transparent);
  -webkit-backdrop-filter: blur(14px); backdrop-filter: blur(14px);
  box-shadow: var(--card-shadow);
}
.stat { display: grid; gap: 2px; justify-items: center; text-align: center; }
.stat b { font-size: clamp(24px, 2.6vw, 34px); font-weight: 650; letter-spacing: -.02em; background: linear-gradient(120deg, var(--accent), var(--cyan)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.stat span { color: var(--muted); font-size: 11px; letter-spacing: .06em; }

/* ---------- Section ---------- */
.section { position: relative; z-index: 1; width: min(1180px, calc(100% - 48px)); margin: 0 auto; padding: 120px 0; }
.section-heading { max-width: 570px; }
.section-index { color: var(--muted); }
.section h2 { margin: 20px 0; color: var(--text); font-size: clamp(34px, 4.4vw, 58px); font-weight: 650; line-height: 1.12; letter-spacing: -.03em; }
.section h2 em { background: linear-gradient(95deg, var(--accent), var(--violet)); -webkit-background-clip: text; background-clip: text; }
.section-heading p, .architecture-copy > p { max-width: 510px; margin: 0; color: var(--muted); line-height: 1.9; }

/* ---------- Bento 能力网格 ---------- */
.bento-grid { display: grid; grid-template-columns: repeat(4, 1fr); grid-auto-rows: minmax(210px, auto); gap: 16px; margin-top: 64px; }
.bento-card {
  position: relative; overflow: hidden; padding: 28px;
  border: 1px solid var(--card-border); border-radius: 20px;
  background: var(--card); box-shadow: var(--card-shadow);
  transition: transform .35s var(--ease), box-shadow .35s, border-color .35s;
}
.bento-card:hover { border-color: var(--card-border-hover); box-shadow: var(--card-shadow-hover); transform: translateY(-4px); }
.bento-card h3 { margin: 0 0 10px; font-size: 19px; font-weight: 650; letter-spacing: -.02em; }
.bento-card p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.8; }
.bento-card a { display: inline-block; margin-top: 14px; color: var(--accent); font-size: 12px; font-weight: 600; }
.bento-card a span { margin-left: 6px; font-size: 15px; }
.card-number { position: absolute; top: 26px; right: 26px; color: var(--faint); font-size: 10px; letter-spacing: .15em; }
.bento-chat { grid-column: span 2; grid-row: span 2; display: grid; grid-template-rows: auto 1fr; gap: 20px; }

/* 聊天气泡 mock */
.chat-mock { display: grid; gap: 12px; align-content: center; padding: 6px 2px 2px; }
.bubble {
  display: flex; align-items: flex-end; gap: 9px; max-width: 78%;
  padding: 11px 15px; border-radius: 16px; font-size: 12.5px; line-height: 1.55;
  animation: bubble-in .5s var(--ease) both;
}
.bubble span { display: grid; gap: 3px; }
.bubble-left { justify-self: start; border-bottom-left-radius: 5px; color: var(--text); background: var(--meta-bg); border: 1px solid var(--line); }
.bubble-right { justify-self: end; border-bottom-right-radius: 5px; color: #fff; background: linear-gradient(120deg, var(--accent), var(--accent-strong)); }
.bubble-left:nth-of-type(3) { animation-delay: .25s; }
.bubble-right:nth-of-type(2) { animation-delay: .12s; }
.mock-avatar { display: grid; place-items: center; flex: 0 0 26px; width: 26px; height: 26px; border-radius: 50%; color: #fff; background: linear-gradient(140deg, #69c7ff, #7774ff); font-size: 11px; font-style: normal; }
.mock-avatar + span { background: var(--card); }
.bubble b { font-size: 12px; }
.bubble small { color: var(--faint); font-size: 10px; }
.bubble-right .bubble-file, .bubble small { letter-spacing: 0; }

/* 音视频 mock：三个头像环 */
.rtc-mock { display: flex; justify-content: center; gap: -10px; margin: 8px 0 18px; }
.rtc-mock i { display: grid; place-items: center; width: 44px; height: 44px; border-radius: 50%; border: 2px solid var(--card); box-shadow: 0 6px 16px rgba(20, 45, 90, .14); font-style: normal; font-size: 10px; font-weight: 700; color: #fff; }
.rtc-mock i:nth-child(1) { background: linear-gradient(140deg, #69c7ff, #4a7dff); z-index: 1; }
.rtc-mock i:nth-child(2) { background: linear-gradient(140deg, #7c74ff, #b56aff); margin-left: -12px; z-index: 2; }
.rtc-mock i:nth-child(3) { background: linear-gradient(140deg, #43d6c5, #2f9dd8); margin-left: -12px; z-index: 3; }
.bento-rtc { background: linear-gradient(170deg, color-mix(in srgb, var(--accent) 7%, var(--card)), var(--card) 65%); }

/* 管理 mock：迷你柱状图 */
.admin-mock { display: flex; align-items: flex-end; gap: 7px; height: 56px; margin: 8px 0 18px; }
.admin-mock b { flex: 1; border-radius: 6px 6px 2px 2px; background: linear-gradient(180deg, var(--accent), color-mix(in srgb, var(--accent) 35%, transparent)); animation: bar-grow 1.2s var(--ease) both; }
.admin-mock b:nth-child(1) { height: 40%; }
.admin-mock b:nth-child(2) { height: 75%; animation-delay: .12s; }
.admin-mock b:nth-child(3) { height: 55%; animation-delay: .24s; }
.admin-mock b:nth-child(4) { height: 92%; animation-delay: .36s; background: linear-gradient(180deg, var(--cyan), color-mix(in srgb, var(--cyan) 35%, transparent)); }

/* 多端 mock：平台胶囊 */
.device-mock { display: flex; flex-wrap: wrap; gap: 8px; margin: 8px 0 18px; }
.device-mock span { padding: 6px 12px; border: 1px solid var(--card-border); border-radius: 999px; color: var(--muted); font-size: 11px; font-weight: 600; }
.device-mock span:nth-child(odd) { border-color: color-mix(in srgb, var(--accent) 30%, transparent); color: var(--accent); background: var(--accent-soft); }

/* 安全 mock */
.security-mock { display: flex; align-items: center; gap: 10px; margin: 8px 0 18px; padding: 11px 14px; border: 1px dashed var(--card-border-hover); border-radius: 12px; color: var(--muted); font-size: 11.5px; }
.security-mock .lock { font-size: 16px; }

/* ---------- 架构 ---------- */
.architecture { display: grid; grid-template-columns: .85fr 1.15fr; align-items: center; gap: clamp(50px, 9vw, 130px); padding-top: 70px; }
.architecture-copy { max-width: 460px; }
.architecture-points { display: grid; gap: 15px; margin-top: 32px; color: var(--muted); font-size: 12.5px; }
.architecture-points span { display: flex; align-items: center; gap: 11px; }
.architecture-points i { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 12%, transparent); }
.architecture-map { position: relative; min-height: 520px; overflow: hidden; border: 1px solid var(--card-border); border-radius: 22px; background: linear-gradient(150deg, color-mix(in srgb, var(--card) 88%, var(--bg)), var(--card) 55%, color-mix(in srgb, var(--violet) 5%, var(--card))); box-shadow: inset 0 0 60px color-mix(in srgb, var(--accent) 5%, transparent), var(--card-shadow); }
.architecture-map::before { position: absolute; inset: 0; content: ""; opacity: .4; background-image: linear-gradient(color-mix(in oklab, var(--accent) 8%, transparent) 1px, transparent 1px), linear-gradient(90deg, color-mix(in oklab, var(--accent) 8%, transparent) 1px, transparent 1px); background-size: 40px 40px; mask-image: radial-gradient(circle at center, #000 0, transparent 75%); }
.map-line { position: absolute; z-index: 1; height: 1px; transform-origin: left center; background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 70%, transparent), color-mix(in srgb, var(--cyan) 12%, transparent)); }
.map-line-one { top: 50%; left: 50%; width: 34%; transform: rotate(-31deg); }
.map-line-two { top: 50%; left: 50%; width: 36%; transform: rotate(25deg); }
.map-line-three { top: 50%; left: 50%; width: 33%; transform: rotate(166deg); }
.map-node { position: absolute; z-index: 2; display: grid; place-items: center; width: 104px; height: 104px; border: 1px solid var(--card-border-hover); border-radius: 22px; color: var(--text); background: var(--card); box-shadow: 0 14px 30px rgba(20, 45, 90, .1); }
.map-node span { margin-top: 3px; font-size: 12px; font-weight: 700; }
.map-node small { color: var(--faint); font-size: 7px; letter-spacing: .1em; }
.map-node b { color: var(--accent); font-size: 22px; font-weight: 400; }
.map-node-core { top: 40%; left: 41%; width: 122px; height: 122px; border-color: var(--accent); color: #fff; background: linear-gradient(145deg, var(--accent), var(--violet)); box-shadow: 0 16px 36px color-mix(in srgb, var(--accent) 34%, transparent); }
.map-node-core span { font-size: 14px; letter-spacing: .08em; }
.map-node-core small { color: rgba(255, 255, 255, .68); }
.map-node-core::after { position: absolute; inset: -12px; border: 1px dashed color-mix(in srgb, var(--accent) 52%, transparent); border-radius: 30px; content: ""; animation: spin 14s linear infinite; }
.map-node-message { top: 13%; left: 8%; }
.map-node-storage { top: 11%; right: 8%; }
.map-node-rtc { right: 8%; bottom: 12%; }
.map-tag { position: absolute; z-index: 3; padding: 5px 9px; border: 1px solid var(--card-border); border-radius: 6px; color: var(--muted); background: var(--card); font-size: 7px; letter-spacing: .13em; }
.tag-flutter { bottom: 19%; left: 12%; }
.tag-api { top: 52%; right: 9%; }
.tag-cloud { right: 14%; bottom: 24%; }

/* ---------- 下载 ---------- */
.downloads { padding-top: 100px; }
.downloads-heading { display: grid; grid-template-columns: 1fr .75fr; gap: 60px; align-items: end; }
.downloads-heading p { max-width: 380px; margin: 0 0 8px; color: var(--muted); font-size: 13px; line-height: 1.9; }
.software-public-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 60px; }
.public-loading, .public-empty { grid-column: 1 / -1; display: flex; align-items: center; justify-content: center; min-height: 180px; gap: 14px; border: 1px dashed var(--card-border-hover); border-radius: 18px; color: var(--faint); background: var(--card); font-size: 13px; }
.loading-orbit { width: 19px; height: 19px; border: 2px solid var(--card-border); border-top-color: var(--accent); border-radius: 50%; animation: spin 1s linear infinite; }
.public-software-card { position: relative; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 17px; min-height: 156px; padding: 25px; border: 1px solid var(--card-border); border-radius: 18px; background: var(--card); box-shadow: var(--card-shadow); transition: transform .3s var(--ease), box-shadow .3s, border-color .3s; }
.public-software-card:hover { border-color: var(--card-border-hover); box-shadow: var(--card-shadow-hover); transform: translateY(-4px); }
.software-platform-icon { display: grid; place-items: center; width: 52px; height: 52px; border-radius: 15px; color: #fff; background: linear-gradient(145deg, var(--accent), var(--cyan)); font-size: 19px; font-weight: 700; }
.software-platform-icon.ios { background: linear-gradient(145deg, #596d8a, #14283f); }
.public-software-card h3 { margin: 0 0 3px; font-size: 16px; letter-spacing: -.02em; }
.public-software-card p { overflow: hidden; max-width: 350px; margin: 0; color: var(--muted); font-size: 11px; text-overflow: ellipsis; white-space: nowrap; }
.software-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 9px; color: var(--muted); font-size: 10px; }
.software-meta span { padding: 3px 7px; border-radius: 5px; background: var(--meta-bg); }
.public-download { display: inline-flex; align-items: center; gap: 6px; color: var(--accent); font-size: 12px; font-weight: 700; white-space: nowrap; }
.public-download span { font-size: 16px; }
.downloads-note { display: flex; align-items: center; gap: 12px; margin-top: 18px; padding: 13px 16px; border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent); border-radius: 12px; color: var(--muted); background: var(--accent-soft); font-size: 11px; }
.downloads-note p { flex: 1; margin: 0; }
.note-mark { display: grid; flex: 0 0 20px; place-items: center; width: 20px; height: 20px; border-radius: 50%; color: var(--accent); background: color-mix(in srgb, var(--accent) 16%, transparent); font-family: Georgia, serif; font-size: 13px; font-style: italic; }
.downloads-note a { color: var(--accent); font-weight: 600; white-space: nowrap; }
.downloads-note a span { margin-left: 5px; }

/* ---------- CTA & 页脚 ---------- */
.final-cta { position: relative; z-index: 1; width: min(1180px, calc(100% - 48px)); min-height: 380px; margin: 20px auto 120px; overflow: hidden; padding: 68px clamp(30px, 8vw, 100px); border: 1px solid color-mix(in srgb, var(--accent) 26%, transparent); border-radius: 24px; color: #fff; background: linear-gradient(130deg, var(--accent-strong), var(--accent) 45%, var(--violet)); box-shadow: 0 26px 60px color-mix(in srgb, var(--accent) 28%, transparent); }
.final-cta::before { position: absolute; inset: 0; content: ""; opacity: .3; background-image: linear-gradient(rgba(255, 255, 255, .14) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, .14) 1px, transparent 1px); background-size: 42px 42px; mask-image: linear-gradient(90deg, #000, transparent); }
.final-cta > *:not(.cta-orb) { position: relative; z-index: 2; }
.final-cta .section-index { color: rgba(255, 255, 255, .72); }
.final-cta h2 { margin: 20px 0 12px; color: #fff; font-size: clamp(32px, 4.8vw, 54px); line-height: 1.12; letter-spacing: -.02em; }
.final-cta h2 em { color: var(--cyan); background: none; -webkit-text-fill-color: currentColor; }
.final-cta p { margin: 0 0 26px; color: rgba(255, 255, 255, .66); font-size: 13px; }
.button-light { color: var(--accent-strong); background: #f4fbff; }
.button-light:hover { box-shadow: 0 10px 26px rgba(255, 255, 255, .3); }
.cta-orb { position: absolute; top: -180px; right: -30px; width: 480px; height: 480px; border: 1px solid rgba(255, 255, 255, .25); border-radius: 50%; box-shadow: 0 0 0 35px rgba(255, 255, 255, .05), inset 0 0 70px rgba(255, 255, 255, .12); animation: orbit-drift 13s ease-in-out infinite alternate; }
.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 30px; width: min(1180px, calc(100% - 48px)); margin: 0 auto; padding: 0 0 38px; color: var(--muted); font-size: 11px; }
.footer-brand { display: inline-flex; align-items: center; gap: 12px; color: var(--text); }
.footer-brand .brand-mark { border-color: var(--card-border); background: var(--card); }
.footer-brand small, .footer-brand .brand-copy small { color: var(--faint); }
.footer-links { display: flex; gap: 26px; }
.footer-links a:hover { color: var(--accent); }
.footer-copy { color: var(--faint); }

/* ---------- 动画 ---------- */
[data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity .8s var(--ease), transform .8s var(--ease); transition-delay: var(--reveal-delay, 0ms); }
[data-reveal].is-visible { opacity: 1; transform: none; }
@keyframes pulse { 0%, 100% { opacity: .65; transform: scale(.9); } 50% { opacity: 1; transform: scale(1.1); } }
@keyframes orbit-drift { from { transform: translate3d(-1%, -1%, 0) rotate(-4deg); } to { transform: translate3d(2%, 2%, 0) rotate(5deg); } }
@keyframes panel-float { 0%, 100% { transform: rotateY(-6deg) rotateX(3deg) translateY(0); } 50% { transform: rotateY(-3deg) rotateX(2deg) translateY(-11px); } }
@keyframes card-float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }
@keyframes core-breathe { 0%, 100% { box-shadow: 0 0 0 12px color-mix(in srgb, var(--accent) 7%, transparent), 0 20px 50px color-mix(in srgb, var(--accent) 34%, transparent); } 50% { box-shadow: 0 0 0 19px color-mix(in srgb, var(--accent) 5%, transparent), 0 24px 70px color-mix(in srgb, var(--cyan) 42%, transparent); } }
@keyframes spin { to { transform: rotate(360deg); } }
@keyframes spin-reverse { to { transform: rotate(-360deg); } }
@keyframes scroll-bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(4px); } }
@keyframes marquee { to { transform: translateX(-50%); } }
@keyframes bubble-in { from { opacity: 0; transform: translateY(10px) scale(.96); } to { opacity: 1; transform: none; } }
@keyframes bar-grow { from { transform: scaleY(0); transform-origin: bottom; } to { transform: scaleY(1); } }

/* ---------- 响应式 ---------- */
@media (max-width: 1000px) {
  .bento-grid { grid-template-columns: repeat(2, 1fr); }
  .bento-chat { grid-column: span 2; }
}
@media (max-width: 900px) {
  .stats-band { grid-template-columns: repeat(2, 1fr); gap: 18px; padding: 22px 18px; }
  .nav-admin { padding: 8px 12px; white-space: nowrap; font-size: 12.5px; }
  .site-header { top: 10px; height: 58px; padding: 0 10px 0 16px; }
  .site-nav {
    position: absolute; top: 66px; right: 10px; left: 10px;
    display: none; grid-column: auto; gap: 2px; padding: 12px;
    border: 1px solid var(--nav-border); border-radius: 16px; color: var(--text); background: var(--nav-bg);
    -webkit-backdrop-filter: blur(24px) saturate(1.6); backdrop-filter: blur(24px) saturate(1.6);
    box-shadow: 0 24px 50px rgba(8, 20, 45, .25);
  }
  .site-header.menu-open .site-nav { display: grid; }
  .site-nav > a { padding: 12px 14px; }
  .nav-admin { justify-content: space-between; }
  .mobile-menu {
    display: grid; gap: 5px; width: 38px; height: 38px; place-content: center;
    border: 1px solid var(--card-border); border-radius: 10px;
    color: var(--text); background: transparent; cursor: pointer;
  }
  .mobile-menu span { display: block; width: 17px; height: 1px; background: currentColor; transition: transform .25s; }
  .site-header.menu-open .mobile-menu span:first-child { transform: translateY(3px) rotate(45deg); }
  .site-header.menu-open .mobile-menu span:last-child { transform: translateY(-3px) rotate(-45deg); }
  .hero-inner { grid-template-columns: 1fr; width: min(720px, calc(100% - 48px)); padding-top: 150px; }
  .hero-copy { max-width: 650px; }
  .hero-visual { width: min(620px, 100%); min-height: 460px; margin: 0 auto; }
  .visual-panel { inset: 25px 15px 28px 0; }
  .architecture { grid-template-columns: 1fr; }
  .architecture-map { min-height: 480px; }
  .downloads-heading { grid-template-columns: 1fr; gap: 0; }
  .downloads-heading p { max-width: 520px; margin-top: 4px; }
  .site-footer { flex-wrap: wrap; }
  .footer-copy { width: 100%; order: 3; }
}
@media (max-width: 620px) {
  .hero-inner, .section, .final-cta, .site-footer { width: min(100% - 32px, 560px); }
  /* 头部防挤压：品牌副标题隐藏、按钮不换行 */
  .nav-admin { padding: 8px 10px; font-size: 12px; gap: 6px; }
  .nav-admin b { display: none; }
  .brand-copy small { display: none; }
  .brand-copy strong { font-size: 15px; }
  .theme-toggle { width: 34px; height: 34px; }
  .site-header { gap: 8px; }
  /* 下载卡片：描述允许换行，卡片不允许横向溢出 */
  .capability-grid, .software-public-grid { grid-template-columns: 1fr; }
  .software-public-grid { min-width: 0; }
  .public-software-card { max-width: 100%; min-width: 0; overflow: hidden; }
  .public-software-card p { white-space: normal; max-width: 100%; }
  .software-meta span { white-space: nowrap; }
  .hero { min-height: 880px; }
  .hero-inner { min-height: 880px; padding-top: 130px; padding-bottom: 80px; }
  .hero h1 { margin-top: 20px; font-size: 44px; }
  .hero-lead { font-size: 14px; }
  .hero-proof { gap: 12px; margin-top: 30px; }
  .hero-visual { min-height: 375px; margin-top: 5px; }
  .visual-panel { inset: 22px 0 25px; border-radius: 18px; }
  .visual-center { inset: 55px 0 58px; }
  .connection-ring-outer { width: 215px; height: 215px; }
  .connection-ring-inner { width: 140px; height: 140px; }
  .connection-core { width: 84px; height: 84px; border-radius: 22px; }
  .connection-core img { width: 36px; height: 36px; }
  .node { width: 44px; height: 44px; border-radius: 12px; font-size: 8px; }
  .node-a { left: 10%; }
  .node-b { right: 10%; }
  .node-c { right: 9%; }
  .node-d { left: 9%; }
  .floating-card { padding: 9px 10px; }
  .floating-card-top { top: 2px; right: -5px; }
  .floating-card-bottom { bottom: 0; left: -6px; }
  .hero-scroll { bottom: 33px; }
  .bento-grid { grid-template-columns: 1fr; }
  .bento-chat { grid-column: span 1; }
  .section { padding: 90px 0; }
  .section h2 { font-size: 38px; }
  .capability-grid { margin-top: 42px; }
  .architecture { padding-top: 40px; }
  .architecture-map { min-height: 390px; }
  .map-node { width: 75px; height: 75px; border-radius: 18px; }
  .map-node-core { width: 92px; height: 92px; left: 37%; }
  .map-node-message { left: 5%; }
  .map-node-storage { right: 5%; }
  .map-node-rtc { right: 5%; }
  .downloads { padding-top: 50px; }
  .public-software-card { grid-template-columns: auto 1fr; padding: 19px; }
  .public-download { grid-column: 2; justify-self: start; }
  .downloads-note { align-items: flex-start; flex-wrap: wrap; }
  .downloads-note p { flex-basis: calc(100% - 34px); }
  .downloads-note a { margin-left: 32px; }
  .final-cta { min-height: 350px; margin-bottom: 75px; padding: 45px 27px; }
  .final-cta h2 { font-size: 36px; }
  .cta-orb { top: -110px; right: -180px; width: 380px; height: 380px; }
  .stats-band { grid-template-columns: repeat(2, 1fr); }
  .site-footer { gap: 20px; }
  .footer-links { gap: 15px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
}