:root {
    --bg: #0b0705;
    --bg-2: #150d08;
    --card: rgba(255, 244, 235, .045);
    --card-strong: rgba(255, 244, 235, .075);
    --line: rgba(255, 220, 195, .1);
    --line-strong: rgba(255, 220, 195, .2);
    --text: #f7efe8;
    --text-2: #c4b3a5;
    --text-3: #8a7a6d;
    --a1: #ff7162;
    --a2: #ffbc5f;
    --grad: linear-gradient(115deg, #ff8a70, #ffb56b 55%, #ffd08a);
    --grad-btn: linear-gradient(135deg, #ff7162, #ffbc5f);
    --radius: 20px;
  }
  * { margin: 0; padding: 0; box-sizing: border-box; }
  html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
  body {
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro SC", "SF Pro Text", "PingFang SC", "Helvetica Neue", "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
  }
  ::selection { background: rgba(255, 113, 98, .35); }
  a { color: inherit; text-decoration: none; }
  img { display: block; }
  ::-webkit-scrollbar { width: 10px; }
  ::-webkit-scrollbar-thumb { background: rgba(255, 235, 220, .14); border-radius: 8px; }
  ::-webkit-scrollbar-track { background: transparent; }

  /* ---------- 背景氛围 ---------- */
  .orb { position: absolute; border-radius: 50%; filter: blur(110px); opacity: .45; pointer-events: none; z-index: 0; }
  .orb-1 { width: 560px; height: 560px; background: #a3301c; top: -160px; left: -160px; animation: drift 17s ease-in-out infinite alternate; }
  .orb-2 { width: 480px; height: 480px; background: #b45309; top: -60px; right: -140px; animation: drift 21s ease-in-out infinite alternate-reverse; }
  .orb-3 { width: 340px; height: 340px; background: #7c2d12; top: 460px; left: 42%; opacity: .3; animation: drift 25s ease-in-out infinite alternate; }
  @keyframes drift {
    from { transform: translate3d(0, 0, 0) scale(1); }
    to   { transform: translate3d(60px, 46px, 0) scale(1.12); }
  }
  .grid-bg {
    position: absolute; inset: 0; z-index: 0; pointer-events: none;
    background-image:
      linear-gradient(rgba(255, 224, 195, .045) 1px, transparent 1px),
      linear-gradient(90deg, rgba(255, 224, 195, .045) 1px, transparent 1px);
    background-size: 56px 56px;
    -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 35%, transparent 78%);
            mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 35%, transparent 78%);
  }
  .ember { position: absolute; width: 6px; height: 6px; border-radius: 50%; background: #ffb56b; box-shadow: 0 0 14px 3px rgba(255, 150, 80, .75); opacity: 0; animation: rise 8s linear infinite; pointer-events: none; z-index: 0; }
  @keyframes rise {
    0% { transform: translateY(0) scale(1); opacity: 0; }
    8% { opacity: .9; }
    100% { transform: translateY(-360px) scale(.4); opacity: 0; }
  }
  .hero-wrap { position: relative; overflow: hidden; }

  /* ---------- 导航 ---------- */
  nav { position: sticky; top: 0; z-index: 50; transition: background .3s, border-color .3s; border-bottom: 1px solid transparent; }
  nav.scrolled {
    background: rgba(11, 7, 5, .72);
    -webkit-backdrop-filter: saturate(160%) blur(18px);
    backdrop-filter: saturate(160%) blur(18px);
    border-bottom-color: var(--line);
  }
  .nav-inner { max-width: 1120px; margin: 0 auto; padding: 0 24px; height: 64px; display: flex; align-items: center; gap: 28px; }
  .brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; letter-spacing: -.01em; }
  .brand img { width: 30px; height: 30px; border-radius: 8px; box-shadow: 0 2px 10px rgba(255, 113, 98, .5); }
  .nav-links { display: flex; gap: 26px; margin-left: auto; }
  .nav-links a { font-size: 14px; color: var(--text-2); transition: color .2s; }
  .nav-links a:hover { color: var(--text); }
  .lang-switch { display: flex; gap: 2px; padding: 3px; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.04); }
  .lang-btn {
    border: 0; background: transparent; color: var(--text-2);
    font: 600 12.5px/1 inherit; font-family: inherit;
    padding: 7px 13px; border-radius: 999px; cursor: pointer;
    transition: color .2s, background .2s;
  }
  .lang-btn:hover { color: var(--text); }
  .lang-btn.active { background: var(--grad-btn); color: #1c0d06; }

  /* ---------- Hero ---------- */
  .hero {
    position: relative; z-index: 1;
    max-width: 1120px; margin: 0 auto; padding: 92px 24px 110px;
    display: grid; grid-template-columns: 1.02fr .98fr; gap: 40px; align-items: center;
  }
  .badge {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 13px; font-weight: 500; color: var(--text-2);
    border: 1px solid var(--line-strong); border-radius: 999px;
    padding: 7px 14px; background: rgba(255,255,255,.04);
    margin-bottom: 26px;
  }
  .badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--a1); box-shadow: 0 0 10px var(--a1); animation: pulse 2.2s ease-in-out infinite; }
  @keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .35; } }
  h1 { font-size: clamp(40px, 6.4vw, 72px); line-height: 1.06; font-weight: 800; letter-spacing: -.025em; }
  h1 .grad {
    background: var(--grad);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent; color: transparent;
  }
  .hero-desc { margin-top: 22px; font-size: 18px; color: var(--text-2); max-width: 33em; }
  .hero-cta { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }
  .btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 14px 26px; border-radius: 999px;
    font-size: 15.5px; font-weight: 600; font-family: inherit;
    cursor: pointer; border: 0; transition: transform .2s, box-shadow .2s, opacity .2s;
  }
  .btn svg { flex: 0 0 auto; }
  .btn-primary {
    background: var(--grad-btn); color: #1c0d06;
    box-shadow: 0 8px 28px rgba(255, 120, 80, .4), inset 0 1px 0 rgba(255,255,255,.35);
  }
  .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 34px rgba(255, 120, 80, .52); }
  .btn-primary.soon { filter: saturate(.4) brightness(.8); cursor: default; box-shadow: none; color: #3a2417; }
  .btn-primary.soon:hover { transform: none; }
  .btn-ghost { background: rgba(255,255,255,.05); color: var(--text); border: 1px solid var(--line-strong); }
  .btn-ghost:hover { transform: translateY(-2px); background: rgba(255,255,255,.09); }
  .hero-meta { margin-top: 26px; display: flex; gap: 22px; flex-wrap: wrap; color: var(--text-3); font-size: 13.5px; }
  .hero-meta span { display: inline-flex; align-items: center; gap: 7px; }
  .hero-meta svg { color: var(--a1); }

  /* ---------- Hero 模拟群聊 ---------- */
  .mock-zone { position: relative; min-height: 600px; perspective: 1200px; }
  .girl {
    position: absolute; top: -66px; right: -26px; width: 348px; z-index: 1;
    filter: drop-shadow(0 26px 60px rgba(255, 113, 98, .38));
    -webkit-mask-image: linear-gradient(#000 72%, transparent 97%);
            mask-image: linear-gradient(#000 72%, transparent 97%);
    animation: floaty 7s ease-in-out infinite;
    pointer-events: none;
  }
  @keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
  .chat-card {
    position: absolute; left: 0; right: 4%; top: 208px; z-index: 2;
    background: linear-gradient(165deg, var(--card-strong), var(--card));
    border: 1px solid var(--line); border-radius: 22px;
    padding: 22px 22px 20px;
    box-shadow: 0 24px 60px rgba(0,0,0,.5);
    -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px);
    animation: floaty 6.5s ease-in-out infinite 1.2s;
  }
  .chat-head { display: flex; align-items: center; gap: 10px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
  .chat-head .grp { width: 34px; height: 34px; border-radius: 11px; background: var(--grad-btn); display: flex; align-items: center; justify-content: center; color: #1c0d06; flex: 0 0 auto; }
  .chat-head .t { font-size: 14.5px; font-weight: 700; }
  .chat-head .s { font-size: 12px; color: var(--text-3); }
  .narr {
    margin: 16px 0 4px; padding: 12px 15px; border-radius: 13px;
    background: rgba(255, 188, 95, .08); border: 1px solid rgba(255, 188, 95, .18);
    font-size: 13.5px; font-style: italic; color: #ffd9a3; line-height: 1.6;
  }
  .narr .who { display: block; font-style: normal; font-weight: 700; font-size: 11.5px; letter-spacing: .08em; color: var(--a2); margin-bottom: 3px; }
  .msg { display: flex; gap: 11px; margin-top: 15px; }
  .ava {
    width: 36px; height: 36px; border-radius: 50%; flex: 0 0 auto;
    display: flex; align-items: center; justify-content: center;
    font-size: 14px; font-weight: 800; color: #fff;
    box-shadow: 0 4px 12px rgba(0,0,0,.4);
  }
  .bubble { background: rgba(255,255,255,.06); border: 1px solid var(--line); border-radius: 4px 16px 16px 16px; padding: 10px 14px; max-width: 78%; }
  .bubble .nm { font-size: 12px; font-weight: 700; color: var(--a2); }
  .bubble .tx { font-size: 14px; margin-top: 2px; color: var(--text); }
  .typing { display: inline-flex; gap: 5px; align-items: center; padding: 12px 15px; }
  .typing i { width: 6px; height: 6px; border-radius: 50%; background: #ffb56b; animation: blink 1.2s infinite; }
  .typing i:nth-child(2) { animation-delay: .18s; }
  .typing i:nth-child(3) { animation-delay: .36s; }
  @keyframes blink { 0%,70%,100% { opacity: .25; transform: translateY(0); } 35% { opacity: 1; transform: translateY(-3px); } }
  .float-chip {
    position: absolute; z-index: 3;
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 12.5px; font-weight: 600;
    background: linear-gradient(165deg, var(--card-strong), var(--card));
    border: 1px solid var(--line-strong); border-radius: 999px;
    padding: 9px 15px; color: var(--text-2);
    box-shadow: 0 14px 34px rgba(0,0,0,.45);
    -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
  }
  .float-chip.strategy { top: 176px; right: 0; animation: floaty 5.6s ease-in-out infinite .6s; }
  .float-chip.strategy b { color: var(--a2); }
  .float-chip.join { bottom: 4px; right: 10%; animation: floaty 6.2s ease-in-out infinite 2s; }
  .float-chip .mini { width: 22px; height: 22px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 10px; font-weight: 800; color: #fff; }

  /* ---------- Marquee ---------- */
  .marquee-band { padding: 34px 0 38px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(255,255,255,.015); position: relative; z-index: 1; }
  .marquee-label { text-align: center; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; color: var(--text-3); margin-bottom: 22px; }
  .marquee { overflow: hidden; -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); }
  .marquee-track { display: flex; gap: 14px; width: max-content; animation: scroll 34s linear infinite; }
  .marquee:hover .marquee-track { animation-play-state: paused; }
  @keyframes scroll { to { transform: translateX(-50%); } }
  .chip {
    display: inline-flex; align-items: center; gap: 9px;
    border: 1px solid var(--line); border-radius: 999px;
    padding: 10px 20px; font-size: 14.5px; font-weight: 600; color: var(--text-2);
    background: var(--card); white-space: nowrap;
    transition: border-color .2s, color .2s;
  }
  .chip:hover { border-color: var(--line-strong); color: var(--text); }
  .chip i { width: 8px; height: 8px; border-radius: 50%; }

  /* ---------- 通用版式 ---------- */
  section.block { max-width: 1120px; margin: 0 auto; padding: 96px 24px 0; position: relative; z-index: 1; }
  .eyebrow {
    display: block; text-align: center; font-size: 13px; font-weight: 700;
    letter-spacing: .18em; text-transform: uppercase; margin-bottom: 14px;
    background: var(--grad);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent; color: transparent;
  }
  h2.title { text-align: center; font-size: clamp(30px, 4vw, 44px); font-weight: 800; letter-spacing: -.02em; }
  p.subtitle { text-align: center; color: var(--text-2); font-size: 17px; margin: 14px auto 0; max-width: 40em; }

  /* ---------- 功能卡片 ---------- */
  .grid { margin-top: 54px; display: grid; gap: 18px; grid-template-columns: repeat(3, 1fr); }
  .card {
    position: relative; background: var(--card); border: 1px solid var(--line);
    border-radius: var(--radius); padding: 30px 28px; overflow: hidden;
    transition: transform .3s, border-color .3s, background .3s;
  }
  .card::before {
    content: ""; position: absolute; inset: 0;
    background: radial-gradient(420px 160px at 50% -20%, rgba(255, 140, 90, .13), transparent 70%);
    opacity: 0; transition: opacity .3s;
  }
  .card:hover { transform: translateY(-6px); border-color: rgba(255, 160, 110, .4); background: var(--card-strong); }
  .card:hover::before { opacity: 1; }
  .card .ico {
    width: 48px; height: 48px; border-radius: 14px;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(150deg, rgba(255, 113, 98, .2), rgba(255, 188, 95, .12));
    border: 1px solid rgba(255, 160, 110, .32); color: #ffb98a;
  }
  .card h3 { margin-top: 20px; font-size: 18.5px; font-weight: 700; letter-spacing: -.01em; }
  .card p { margin-top: 9px; font-size: 14.5px; color: var(--text-2); }

  /* ---------- 群聊演绎展示 ---------- */
  .show-band { margin-top: 96px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: linear-gradient(180deg, rgba(255, 113, 98, .05), rgba(255, 188, 95, .04)); position: relative; z-index: 1; }
  .show-inner { max-width: 1120px; margin: 0 auto; padding: 78px 24px 84px; }
  .st-row { margin-top: 40px; display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
  .st-chip {
    display: inline-flex; align-items: center; gap: 9px;
    padding: 13px 24px; border-radius: 999px;
    border: 1px solid var(--line-strong); background: var(--card);
    font-size: 15px; font-weight: 600; color: var(--text-2);
    transition: transform .25s, border-color .25s, color .25s;
  }
  .st-chip:hover { transform: translateY(-3px); border-color: rgba(255,160,110,.5); color: var(--text); }
  .st-chip.hot { border-color: rgba(255, 160, 110, .55); background: linear-gradient(150deg, rgba(255,113,98,.16), rgba(255,188,95,.1)); color: var(--text); }
  .st-chip .n { width: 7px; height: 7px; border-radius: 50%; background: var(--a2); box-shadow: 0 0 8px var(--a2); }
  .show-note { text-align: center; margin-top: 22px; font-size: 14px; color: var(--text-3); }
  .chars { margin-top: 46px; display: grid; gap: 16px; grid-template-columns: repeat(4, 1fr); }
  .char {
    background: var(--card); border: 1px solid var(--line); border-radius: 18px;
    padding: 26px 22px; text-align: center;
    transition: transform .3s, border-color .3s, background .3s;
  }
  .char:hover { transform: translateY(-6px); border-color: rgba(255,160,110,.4); background: var(--card-strong); }
  .char .ava { width: 62px; height: 62px; margin: 0 auto; font-size: 22px; border-radius: 20px; }
  img.ava, img.mini { object-fit: cover; display: block; }
  .char h4 { margin-top: 16px; font-size: 16.5px; font-weight: 700; }
  .char p { margin-top: 6px; font-size: 13px; color: var(--text-2); }

  /* ---------- FAQ ---------- */
  .faq-list { margin-top: 50px; display: grid; gap: 13px; max-width: 840px; margin-left: auto; margin-right: auto; }
  details { background: var(--card); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; transition: border-color .25s, background .25s; }
  details[open] { border-color: rgba(255,160,110,.4); background: var(--card-strong); }
  summary {
    cursor: pointer; list-style: none;
    padding: 21px 24px; font-size: 16.5px; font-weight: 600;
    display: flex; justify-content: space-between; align-items: center; gap: 16px;
  }
  summary::-webkit-details-marker { display: none; }
  summary .plus { position: relative; width: 22px; height: 22px; flex: 0 0 auto; }
  summary .plus::before, summary .plus::after { content: ""; position: absolute; inset: 0; margin: auto; background: var(--text-2); transition: transform .25s; }
  summary .plus::before { width: 14px; height: 2px; }
  summary .plus::after { width: 2px; height: 14px; }
  details[open] .plus::after { transform: rotate(90deg); }
  details .answer { padding: 0 24px 22px; color: var(--text-2); font-size: 15px; }
  details .answer p + p { margin-top: 10px; }

  /* ---------- 联系 ---------- */
  .contact-grid { margin-top: 54px; display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
  .contact-card {
    background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
    padding: 36px 32px; text-align: center;
    transition: transform .3s, border-color .3s;
  }
  .contact-card:hover { transform: translateY(-6px); border-color: rgba(255,160,110,.4); }
  .contact-card .ic {
    width: 52px; height: 52px; margin: 0 auto; border-radius: 16px;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(150deg, rgba(255,113,98,.2), rgba(255,188,95,.14));
    border: 1px solid rgba(255,160,110,.32); color: #ffb98a;
  }
  .contact-card h3 { margin-top: 18px; font-size: 18px; font-weight: 700; }
  .contact-card p { margin-top: 8px; font-size: 14.5px; color: var(--text-2); }
  .contact-card a.mail {
    display: inline-block; margin-top: 18px; font-weight: 600; font-size: 15px;
    padding: 11px 24px; border-radius: 999px;
    background: rgba(255,255,255,.06); border: 1px solid var(--line-strong);
    transition: background .2s, border-color .2s;
  }
  .contact-card a.mail:hover { background: rgba(255,255,255,.1); border-color: rgba(255,160,110,.5); }

  /* ---------- 页脚 ---------- */
  footer { margin-top: 110px; border-top: 1px solid var(--line); padding: 44px 24px 56px; background: rgba(255,255,255,.015); position: relative; z-index: 1; }
  .foot-inner { max-width: 1120px; margin: 0 auto; display: flex; flex-wrap: wrap; gap: 18px; align-items: center; justify-content: space-between; }
  .foot-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 15px; }
  .foot-brand img { width: 26px; height: 26px; border-radius: 7px; }
  .foot-links { display: flex; gap: 22px; font-size: 13.5px; color: var(--text-2); }
  .foot-links a:hover { color: var(--text); }
  .foot-note { margin-top: 22px; padding-top: 22px; border-top: 1px solid var(--line); font-size: 12.5px; color: var(--text-3); max-width: 1120px; margin-left: auto; margin-right: auto; }

  /* ---------- 滚动进场 ---------- */
  .reveal { opacity: 0; transform: translateY(28px); transition: opacity .75s cubic-bezier(.22,.8,.3,1), transform .75s cubic-bezier(.22,.8,.3,1); transition-delay: var(--d, 0s); }
  .reveal.in { opacity: 1; transform: none; }

  @media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation: none !important; transition: none !important; }
    html { scroll-behavior: auto; }
    .reveal { opacity: 1; transform: none; }
  }

  /* ---------- 响应式 ---------- */
  @media (max-width: 980px) {
    .hero { grid-template-columns: 1fr; padding-top: 64px; gap: 12px; }
    .mock-zone { max-width: 560px; margin: 20px auto 0; width: 100%; min-height: 560px; }
    .girl { width: 280px; top: -40px; right: -10px; }
    .chat-card { top: 180px; }
    .grid { grid-template-columns: 1fr 1fr; }
    .chars { grid-template-columns: 1fr 1fr; }
  }
  @media (max-width: 640px) {
    .nav-links { display: none; }
    .nav-inner { height: 58px; }
    .hero { padding: 48px 20px 72px; }
    .grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .mock-zone { min-height: 500px; }
    .girl { width: 216px; top: -26px; right: -6px; }
    .chat-card { top: 150px; padding: 16px 16px 14px; }
    .bubble .tx { font-size: 13px; }
    .narr { font-size: 12.5px; }
    .section-pad { padding-top: 72px !important; }
  }