:root{
  --blue:#1668FF;
  --blue-dark:#0F52D6;
  --blue-deep:#0A2A66;
  --teal:#00D2B8;
  --teal-dark:#00A896;
  --ink:#0F1B2D;
  --ink-2:#3D4A5C;
  --ink-3:#6B7889;
  --line:#E8ECF3;
  --line-2:#DCE3EE;
  --bg:#FFFFFF;
  --bg-2:#F2F6FF;            /* 浅蓝 tint，用于模块色差 */
  --bg-3:#EEF3FA;
  --radius:16px;
  --radius-s:10px;
  --shadow:0 2px 8px rgba(15,27,45,.05);
  --shadow-l:0 12px 32px rgba(15,27,45,.10);
  --max:1200px;
  --nav-h:64px;
  --sec:64px;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Roboto Mono",monospace;
  --font:"HarmonyOS Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 12px);scrollbar-gutter:stable}
body{font-family:var(--font);color:var(--ink);background:var(--bg);line-height:1.7;-webkit-font-smoothing:antialiased;font-size:16px}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,select{font-family:inherit;font-size:15px}
ul{list-style:none}

/* top tech bar + scroll progress */
body::before{content:"";position:fixed;top:0;left:0;right:0;height:3px;z-index:300;background:linear-gradient(90deg,var(--blue),var(--teal),var(--blue));background-size:200% 100%;animation:flow 6s linear infinite}
@keyframes flow{from{background-position:0 0}to{background-position:200% 0}}
.scroll-bar{position:fixed;top:0;left:0;height:3px;width:0;z-index:301;background:linear-gradient(90deg,var(--teal),var(--blue));box-shadow:0 0 10px rgba(22,104,255,.6);transition:width .08s linear}

.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}
.section{padding:var(--sec) 0}
.section--alt{background:var(--bg-2);border-top:1px solid var(--line)}
.section--deep{background:var(--blue-deep);color:#fff;overflow:hidden;position:relative}
.section--deep::before{content:"";position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.04) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.04) 1px,transparent 1px);background-size:46px 46px;pointer-events:none}
.section--deep .eyebrow{color:#9FE1CB;background:rgba(0,210,184,.14)}
.section--deep .h2{color:#fff}
.section--deep .h2::after{background:linear-gradient(90deg,var(--teal),var(--blue))}
.section--deep .lead{color:rgba(255,255,255,.72)}
.section--deep > .wrap{position:relative;z-index:2}
/* 深蓝带内的卡片改为半透明玻璃卡，文字统一用浅色，避免白字压白底看不见 */
.section--deep .card{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.14);color:#fff;backdrop-filter:blur(6px)}
.section--deep .card:hover{background:rgba(255,255,255,.1);border-color:rgba(0,210,184,.45);box-shadow:0 16px 40px rgba(0,0,0,.35)}
.section--deep .card h3{color:#fff}
.section--deep .card p{color:rgba(255,255,255,.72)}
.section--deep .card__ico{background:rgba(0,210,184,.16)}
.section--deep .card__ico svg{stroke:#5FE9D2}

/* section header */
.center{text-align:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:500;letter-spacing:.06em;color:var(--blue);background:rgba(22,104,255,.08);padding:6px 14px;border-radius:99px;margin-bottom:16px}
.eyebrow--light{color:#8FE6DA;background:rgba(0,210,184,.14)}
.h2{font-size:32px;line-height:1.3;font-weight:600;letter-spacing:-.01em}
.center .h2{position:relative;display:inline-block}
.center .h2::after{content:"";display:block;width:46px;height:3px;margin:15px auto 0;border-radius:99px;background:linear-gradient(90deg,var(--blue),var(--teal))}
.lead{font-size:16px;color:var(--ink-3);margin-top:11px;max-width:720px;line-height:1.7}
.center .lead{margin-left:auto;margin-right:auto}
/* consistent spacing between section header and content */
.center + *{margin-top:34px}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 24px;border-radius:10px;font-size:15px;font-weight:500;transition:.2s;white-space:nowrap}
.btn--primary{background:var(--blue);color:#fff}
.btn--primary:hover{background:var(--blue-dark);transform:translateY(-2px);box-shadow:0 8px 20px rgba(22,104,255,.28)}
.btn--teal{background:var(--teal);color:#04231F}
.btn--teal:hover{background:var(--teal-dark);color:#fff;transform:translateY(-2px)}
.btn--ghost{border:1px solid var(--line-2);background:#fff;color:var(--ink)}
.btn--ghost:hover{border-color:var(--blue);color:var(--blue)}
.btn--ghost-light{border:1px solid rgba(255,255,255,.35);color:#fff}
.btn--ghost-light:hover{border-color:#fff;background:rgba(255,255,255,.08)}
.btn--sm{height:36px;padding:0 15px;font-size:14px;border-radius:8px}
.btn--block{width:100%}
.btn-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:26px}
.center .btn-row{justify-content:center}

/* nav */
.nav{position:sticky;top:0;z-index:100;height:var(--nav-h);background:rgba(255,255,255,.92);backdrop-filter:blur(12px);border-bottom:1px solid transparent;transition:.25s}
.nav.is-stuck{border-bottom-color:var(--line);box-shadow:0 2px 12px rgba(15,27,45,.05)}
.nav__in{height:var(--nav-h);display:flex;align-items:center;gap:32px}
.logo{display:flex;align-items:center;gap:10px;font-size:18px;font-weight:600;flex-shrink:0}
.logo__mark{width:30px;height:30px;border-radius:8px;background:linear-gradient(135deg,var(--blue),var(--teal));display:flex;align-items:center;justify-content:center;color:#fff;font-size:15px;font-weight:600}
.nav__links{display:flex;gap:26px;font-size:15px;color:var(--ink-2);flex:1}
.nav__links a{transition:.2s;position:relative}
.nav__links a::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:2px;background:var(--blue);transform:scaleX(0);transition:.2s;transform-origin:center}
.nav__links a:hover{color:var(--blue)}
.nav__links a:hover::after{transform:scaleX(1)}
.nav__acts{display:flex;gap:10px;align-items:center}
.nav__toggle{display:none;width:40px;height:40px;align-items:center;justify-content:center}
.nav__toggle span{display:block;width:20px;height:1.5px;background:var(--ink);position:relative}
.nav__toggle span::before,.nav__toggle span::after{content:"";position:absolute;left:0;width:20px;height:1.5px;background:var(--ink)}
.nav__toggle span::before{top:-6px}.nav__toggle span::after{top:6px}

/* hero */
.hero{background:var(--blue-deep);color:#fff;padding:60px 0 72px;position:relative;overflow:hidden;
  background-image:
    linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:42px 42px}
.hero::before{content:"";position:absolute;width:620px;height:620px;border-radius:50%;background:rgba(0,210,184,.10);top:-260px;right:-160px}
.hero::after{content:"";position:absolute;width:460px;height:460px;border-radius:50%;background:rgba(22,104,255,.16);bottom:-260px;left:-140px}
.hero__in{position:relative;display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:center;z-index:1}
.hero h1{font-size:50px;line-height:1.22;font-weight:600;letter-spacing:-.02em}
.hero h1 em{font-style:normal;color:var(--teal)}
.hero__sub{font-size:16.5px;color:rgba(255,255,255,.8);margin-top:16px;max-width:560px;line-height:1.75}
.hero__tags{display:flex;flex-wrap:wrap;gap:9px;margin-top:22px}
.hero__tags span{font-size:13px;padding:6px 13px;border-radius:99px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.14);color:rgba(255,255,255,.9)}
.hero__note{font-size:13px;color:rgba(255,255,255,.55);margin-top:18px}
/* hero floating node decoration */
.hero__nodes{position:absolute;z-index:0;opacity:.5;pointer-events:none}
.hero__glow{position:absolute;width:520px;height:520px;border-radius:50%;background:radial-gradient(circle,rgba(0,210,184,.22),transparent 65%);left:var(--gx,0);top:var(--gy,0);transform:translate(-50%,-50%);z-index:0;pointer-events:none;transition:opacity .3s;opacity:0}
.hero:hover .hero__glow{opacity:1}

/* phone mock */
.phone{width:340px;margin:0 auto;background:#0B1730;border-radius:36px;padding:12px;box-shadow:0 30px 60px rgba(0,0,0,.38);position:relative}
.phone__screen{background:#fff;border-radius:26px;overflow:hidden}
.phone__bar{background:#F4F7FB;padding:12px 16px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}
.phone__who{display:flex;align-items:center;gap:10px}
.avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--teal));display:flex;align-items:center;justify-content:center;color:#fff;font-size:13px;font-weight:600}
.phone__name{font-size:14px;font-weight:600;line-height:1.3}
.phone__state{font-size:11px;color:var(--ink-3)}
.phone__timer{font-size:13px;font-variant-numeric:tabular-nums;color:var(--blue);font-weight:600}
.engine-tab{display:flex;gap:6px;padding:10px 12px;background:#F4F7FB;border-bottom:1px solid var(--line)}
.engine-tab button{flex:1;height:32px;border-radius:8px;font-size:13px;font-weight:500;color:var(--ink-3);transition:.2s}
.engine-tab button.on{background:#fff;color:var(--blue);box-shadow:var(--shadow)}
.engine-tab button.on.warn{color:#D0463A}
.chat{padding:16px;height:296px;overflow-y:auto;display:flex;flex-direction:column;gap:12px;background:#fff}
.bubble{max-width:82%;padding:10px 13px;border-radius:14px;font-size:13.5px;line-height:1.6;animation:pop .3s ease}
@keyframes pop{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.bubble--ai{background:var(--bg-3);color:var(--ink);border-bottom-left-radius:4px;align-self:flex-start}
.bubble--me{background:var(--blue);color:#fff;border-bottom-right-radius:4px;align-self:flex-end}
.bubble--fail{background:#FDECEA;color:#A32D2D;border-bottom-left-radius:4px;align-self:flex-start}
.typing{display:inline-flex;gap:3px;align-items:center;height:14px}
.typing i{width:5px;height:5px;border-radius:50%;background:var(--ink-3);animation:blink 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}.typing i:nth-child(3){animation-delay:.4s}
@keyframes blink{0%,80%,100%{opacity:.25}40%{opacity:1}}
.phone__foot{padding:12px 16px;border-top:1px solid var(--line);background:#fff;display:flex;align-items:center;justify-content:space-between;gap:10px}
.wave{display:flex;gap:2px;align-items:flex-end;height:20px;flex:1}
.wave i{flex:1;background:var(--teal);border-radius:2px;animation:wv 1s ease-in-out infinite}
@keyframes wv{0%,100%{height:4px}50%{height:18px}}
.result{margin:0 12px 12px;padding:12px;border-radius:12px;background:linear-gradient(135deg,rgba(22,104,255,.08),rgba(0,210,184,.10));border:1px solid rgba(22,104,255,.16)}
.result__top{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}
.badge{font-size:11px;font-weight:600;padding:3px 9px;border-radius:99px;background:var(--blue);color:#fff}
.badge--c{background:#98A2B3}
.result__txt{font-size:12.5px;color:var(--ink-2);line-height:1.7}
.result__txt b{color:var(--ink);font-weight:600}

/* cards */
.grid{display:grid;gap:18px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px;transition:.25s;position:relative;overflow:hidden}
.card::before{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:linear-gradient(90deg,var(--blue),var(--teal));transition:width .35s ease;border-radius:var(--radius) var(--radius) 0 0}
.card:hover::before{width:100%}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-l);border-color:rgba(22,104,255,.25)}
.card--flat{background:var(--bg-2);border-color:transparent}
.card--flat:hover{background:#fff;border-color:rgba(22,104,255,.25)}
.card__ico{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:20px;margin-bottom:14px;background:rgba(22,104,255,.09)}
.card__ico svg{width:22px;height:22px;stroke:var(--blue);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.card h3{font-size:18px;font-weight:600;margin-bottom:8px}
.card p{font-size:14.5px;color:var(--ink-3);line-height:1.7}

/* access (saas/api) */
.access{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.access__card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;position:relative;overflow:hidden;transition:.25s}
.access__card::before{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:linear-gradient(90deg,var(--blue),var(--teal));transition:width .35s ease}
.access__card:hover::before{width:100%}
.access__card:hover{transform:translateY(-4px);box-shadow:var(--shadow-l)}
.access__card--api{border-color:rgba(22,104,255,.28);background:linear-gradient(180deg,rgba(22,104,255,.04),#fff)}
.access__tag{display:inline-block;font-size:12px;font-weight:600;letter-spacing:.08em;padding:5px 11px;border-radius:6px;margin-bottom:14px}
.access__tag--s{background:rgba(0,210,184,.14);color:var(--teal-dark)}
.access__tag--a{background:rgba(22,104,255,.10);color:var(--blue)}
.access__card h3{font-size:23px;font-weight:600;margin-bottom:10px}
.access__card > p{font-size:15px;color:var(--ink-3);margin-bottom:20px}
.feat{display:flex;flex-direction:column;gap:11px;margin-bottom:24px}
.feat li{display:flex;gap:10px;font-size:14.5px;color:var(--ink-2);line-height:1.6}
.feat li::before{content:"";flex-shrink:0;width:18px;height:18px;margin-top:3px;border-radius:50%;background:rgba(22,104,255,.10);background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231668FF' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><path d='M20 6L9 17l-5-5'/></svg>");background-size:12px;background-repeat:no-repeat;background-position:center}
.code{background:#0B1730;border-radius:10px;padding:15px;font-family:var(--mono);font-size:12.5px;color:#9FE1CB;line-height:1.8;margin-bottom:20px;overflow-x:auto;border:1px solid rgba(0,210,184,.18)}
.code .c{color:#5C7392}
.code .k{color:#85B7EB}

/* employees */
.emp-illo{display:flex;justify-content:center;margin:-6px auto 30px}
.emp-illo svg{max-width:340px;width:100%;height:auto}
.tabs{display:flex;flex-wrap:wrap;gap:9px;justify-content:center;margin:0 0 26px}
.tabs button{height:36px;padding:0 18px;border-radius:99px;font-size:14px;border:1px solid var(--line-2);background:#fff;color:var(--ink-2);transition:.2s}
.tabs button:hover{border-color:var(--blue);color:var(--blue)}
.tabs button.on{background:var(--blue);border-color:var(--blue);color:#fff}
.emp{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:22px;display:flex;flex-direction:column;transition:.25s;position:relative;overflow:hidden}
.emp::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:linear-gradient(180deg,var(--blue),var(--teal));transform:scaleY(0);transform-origin:top;transition:transform .3s ease}
.emp:hover::before{transform:scaleY(1)}
.emp:hover{transform:translateY(-4px);box-shadow:var(--shadow-l);border-color:rgba(22,104,255,.25)}
.emp__top{display:flex;align-items:center;gap:12px;margin-bottom:12px}
.emp__ico{width:40px;height:40px;border-radius:10px;background:var(--bg-3);display:flex;align-items:center;justify-content:center;font-size:19px;flex-shrink:0}
.emp__name{font-size:16px;font-weight:600}
.emp__desc{font-size:14px;color:var(--ink-3);line-height:1.7;flex:1;margin-bottom:16px}
.emp__acts{display:flex;flex-wrap:wrap;gap:10px}
.emp__acts .btn{order:1;flex:1}

/* 试听迷你音频播放器（带 播放/暂停 标签 + 进度条 + 可拖拽播放头） */
.audio-player{order:2;flex:1 1 100%;display:flex;align-items:center;gap:10px;padding:8px 12px;border:1px solid var(--line-2);border-radius:12px;background:#fff;transition:border-color .2s,box-shadow .2s,background .2s}
.audio-player:hover{border-color:rgba(22,104,255,.35);box-shadow:var(--shadow)}
.audio-player.playing{border-color:rgba(22,104,255,.4);background:linear-gradient(135deg,rgba(22,104,255,.04),rgba(0,210,184,.04))}
.audio-player__btn{width:34px;height:34px;flex:0 0 auto;border-radius:50%;background:linear-gradient(135deg,var(--blue),var(--teal));display:flex;align-items:center;justify-content:center;cursor:pointer;transition:transform .15s,box-shadow .2s}
.audio-player__btn:hover{transform:scale(1.06)}
.audio-player__btn svg{width:15px;height:15px;fill:#fff}
.audio-player__btn .ic-pause{display:none}
.audio-player.playing .ic-play{display:none}
.audio-player.playing .ic-pause{display:block}
.audio-player.playing .audio-player__btn{box-shadow:0 0 0 4px rgba(22,104,255,.16);animation:ply-pulse 1.6s ease-in-out infinite}
@keyframes ply-pulse{0%,100%{box-shadow:0 0 0 4px rgba(22,104,255,.16)}50%{box-shadow:0 0 0 7px rgba(22,104,255,.07)}}
.audio-player__label{flex:0 0 auto;min-width:34px;font-size:13px;font-weight:600;color:var(--blue);cursor:pointer;user-select:none}
.audio-player.unavailable .audio-player__label{color:var(--ink-3);font-weight:500;cursor:default}
.audio-player__bar{position:relative;flex:1;min-width:40px;height:6px;border-radius:99px;background:var(--line-2);cursor:pointer;touch-action:none}
.audio-player__fill{position:absolute;left:0;top:0;height:100%;width:0;background:linear-gradient(90deg,var(--blue),var(--teal));border-radius:99px;transition:width .05s linear}
.audio-player__knob{position:absolute;top:50%;left:0;width:12px;height:12px;border-radius:50%;background:#fff;border:2px solid var(--blue);transform:translate(-50%,-50%);box-shadow:0 1px 3px rgba(0,0,0,.2);pointer-events:none;transition:left .05s linear}
.audio-player__time{flex:0 0 auto;font-size:11px;color:var(--ink-3);font-variant-numeric:tabular-nums;font-family:var(--mono);white-space:nowrap}
.audio-player__time .cur{color:var(--ink);font-weight:600}
.audio-player.unavailable{opacity:.7}
.audio-player.unavailable .audio-player__btn{background:#B6C0D0;animation:none}
.audio-player.unavailable .audio-player__time{color:#C25B5B}
.emp.hide{display:none}

/* takeover */
.takeover{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;background:#fff}
.takeover__side{padding:28px}
.takeover__side--bad{background:#FAFBFD;border-right:1px solid var(--line)}
.takeover__head{display:flex;align-items:center;gap:10px;margin-bottom:18px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.tk-ico{width:30px;height:30px;border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.tk-ico svg{width:18px;height:18px;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;fill:none}
.tk-ico--g{background:rgba(0,210,184,.16)}.tk-ico--g svg{stroke:var(--teal-dark)}
.tk-ico--r{background:rgba(208,70,58,.12)}.tk-ico--r svg{stroke:#D0463A}
.takeover__dot{width:8px;height:8px;border-radius:50%}
.takeover__dot--r{background:#D0463A}
.takeover__dot--g{background:var(--teal)}
.takeover__head h3{font-size:17px;font-weight:600}
.tline{display:flex;gap:12px;padding:10px 0;border-bottom:1px dashed var(--line);font-size:14px;line-height:1.6}
.tline:last-child{border-bottom:none}
.tline__role{flex-shrink:0;width:34px;font-size:12px;font-weight:600;color:var(--ink-3);padding-top:2px}
.tline__txt{color:var(--ink-2)}
.tline--bad .tline__txt{color:#8A4A42}
.takeover__verdict{margin-top:16px;font-size:14px;font-weight:500;padding:12px 14px;border-radius:10px}
.takeover__verdict--r{background:#FDECEA;color:#A32D2D}
.takeover__verdict--g{background:rgba(0,210,184,.12);color:#0F6E56}

/* abilities */
.abil{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.abil__item{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:24px 18px;text-align:center;transition:.25s;position:relative;overflow:hidden}
.abil__item::before{content:"";position:absolute;left:0;top:0;height:3px;width:0;background:linear-gradient(90deg,var(--blue),var(--teal));transition:width .35s ease}
.abil__item:hover::before{width:100%}
.abil__item:hover{transform:translateY(-4px);box-shadow:var(--shadow-l);border-color:rgba(22,104,255,.3)}
.abil__ico{width:46px;height:46px;border-radius:13px;margin:0 auto 12px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,rgba(22,104,255,.10),rgba(0,210,184,.12))}
.abil__ico svg{width:24px;height:24px;stroke:var(--blue);fill:none;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.abil__char{font-size:26px;font-weight:600;line-height:1;margin-bottom:9px;background:linear-gradient(135deg,var(--blue),var(--teal));-webkit-background-clip:text;background-clip:text;color:transparent;font-family:var(--mono)}
.abil__item h3{font-size:16.5px;font-weight:600;margin-bottom:8px}
.abil__item p{font-size:13.5px;color:var(--ink-3);line-height:1.65}

/* tech (deep band) illustration */
.tech-illo{position:absolute;right:-40px;top:50%;transform:translateY(-50%);width:380px;max-width:42%;opacity:.5;pointer-events:none;z-index:0}

/* steps */
.steps{display:grid;grid-template-columns:repeat(6,1fr);gap:14px;margin-top:40px;position:relative}
.step{text-align:center;position:relative;opacity:.35;transition:.5s}
.step.on{opacity:1}
.step__dot{width:40px;height:40px;border-radius:50%;background:#fff;border:1px solid var(--line-2);display:flex;align-items:center;justify-content:center;margin:0 auto 12px;font-size:14px;font-weight:600;color:var(--ink-3);transition:.4s;position:relative;z-index:2}
.step.on .step__dot{background:var(--blue);border-color:var(--blue);color:#fff;box-shadow:0 0 0 5px rgba(22,104,255,.12)}
.step::before{content:"";position:absolute;top:20px;left:50%;width:100%;height:1px;background:var(--line-2);z-index:1}
.step:last-child::before{display:none}
.step h4{font-size:13.5px;font-weight:600;margin-bottom:5px;line-height:1.4}
.step p{font-size:12px;color:var(--ink-3);line-height:1.55}

/* table */
.tbl-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius);background:#fff}
table{width:100%;border-collapse:collapse;min-width:680px}
th,td{padding:15px 20px;text-align:left;font-size:14.5px;border-bottom:1px solid var(--line)}
thead th{background:var(--bg-2);font-weight:600;font-size:14px;color:var(--ink-2)}
thead th.hi{background:linear-gradient(180deg,rgba(22,104,255,.10),rgba(0,210,184,.06));color:var(--blue)}
tbody td.hi{background:rgba(22,104,255,.03);font-weight:500}
tbody tr:last-child td{border-bottom:none}
td .yes{color:var(--teal-dark);font-weight:600}
td .no{color:#B4232A}

/* scenes icons */
.scene-ico{width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center;margin-bottom:14px;background:linear-gradient(135deg,rgba(22,104,255,.10),rgba(0,210,184,.12))}
.scene-ico svg{width:22px;height:22px;stroke:var(--blue);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}

/* why icons */
.why-ico{width:40px;height:40px;border-radius:11px;display:flex;align-items:center;justify-content:center;margin-bottom:13px;background:rgba(22,104,255,.09)}
.why-ico svg{width:21px;height:21px;stroke:var(--blue);fill:none;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}

/* certs */
.certs{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.cert{border:1px solid var(--line);border-radius:var(--radius-s);padding:16px;text-align:center;background:#fff;transition:.25s;position:relative;overflow:hidden}
.cert::before{content:"";position:absolute;left:0;top:0;height:2px;width:0;background:linear-gradient(90deg,var(--blue),var(--teal));transition:width .3s ease}
.cert:hover::before{width:100%}
.cert:hover{border-color:var(--blue);transform:translateY(-3px)}
.cert__n{font-size:21px;font-weight:600;line-height:1.2;font-variant-numeric:tabular-nums;background:linear-gradient(135deg,var(--blue),var(--teal));-webkit-background-clip:text;background-clip:text;color:transparent}
.cert__n small{font-size:14px;-webkit-text-fill-color:var(--blue);color:var(--blue)}
.cert__t{font-size:13px;color:var(--ink-3);margin-top:6px}

/* form */
.form-box{background:#fff;border:1px solid var(--line);border-radius:20px;padding:40px;max-width:600px;margin:0 auto;box-shadow:var(--shadow-l)}
.form-row{display:flex;gap:12px;margin-top:22px}
.form-row .btn{height:50px;flex-shrink:0}
.form-row select,.form-row input{flex:1;height:50px;border:1px solid var(--line-2);border-radius:10px;padding:0 15px;background:#fff;color:var(--ink);outline:none;transition:.2s}
.form-row select:focus,.form-row input:focus{border-color:var(--blue);box-shadow:0 0 0 3px rgba(22,104,255,.10)}
.form-box .btn{height:50px;flex-shrink:0}
.form-tips{display:flex;gap:20px;justify-content:center;margin-top:20px;font-size:13px;color:var(--ink-3);flex-wrap:wrap}
.form-tips span::before{content:"✓";color:var(--teal);font-weight:600;margin-right:5px}
.form-msg{margin-top:16px;font-size:14px;text-align:center;min-height:22px}
.form-msg.ok{color:#0F6E56}
.form-msg.err{color:#B4232A}

/* faq */
.faq{max-width:820px;margin:0 auto}
.faq__item{border-bottom:1px solid var(--line)}
.faq__q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:18px 0;text-align:left;font-size:16px;font-weight:500;transition:.2s}
.faq__q:hover{color:var(--blue)}
.faq__i{flex-shrink:0;width:22px;height:22px;position:relative}
.faq__i::before,.faq__i::after{content:"";position:absolute;background:var(--ink-3);transition:.25s}
.faq__i::before{top:10px;left:0;width:22px;height:1.5px}
.faq__i::after{left:10px;top:0;width:1.5px;height:22px}
.faq__item.on .faq__i::after{transform:rotate(90deg);opacity:0}
.faq__item.on .faq__q{color:var(--blue)}
.faq__a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq__a p{padding:0 0 18px;font-size:14.5px;color:var(--ink-3);line-height:1.8}

/* footer */
.footer{background:var(--blue-deep);color:rgba(255,255,255,.7);padding:48px 0 26px;font-size:14px;position:relative;overflow:hidden}
.footer::before{content:"";position:absolute;width:400px;height:400px;border-radius:50%;background:rgba(0,210,184,.07);top:-200px;right:-120px}
.footer__in{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:36px;padding-bottom:30px;border-bottom:1px solid rgba(255,255,255,.12);position:relative}
.footer h4{color:#fff;font-size:15px;font-weight:600;margin-bottom:14px}
.footer li{margin-bottom:9px}
.footer a:hover{color:var(--teal)}
.footer .beian-link{text-decoration:underline;text-underline-offset:3px;white-space:nowrap}
.footer .beian-link:hover{text-decoration:none}
.footer__btm{padding-top:20px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:rgba(255,255,255,.45);position:relative}
/* 仅供搜索引擎/无障碍阅读的可爬取文本（视觉隐藏） */
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* modal */
.modal{position:fixed;inset:0;z-index:150;display:none;align-items:center;justify-content:center;padding:20px}
.modal.open{display:flex}
.modal__mask{position:absolute;inset:0;background:rgba(10,42,102,.55);backdrop-filter:blur(3px);-webkit-backdrop-filter:blur(3px);will-change:backdrop-filter}
@keyframes fade{from{opacity:0}to{opacity:1}}
.modal__box{position:relative;width:100%;max-width:460px;max-height:92vh;overflow-y:auto;background:#fff;border-radius:20px;padding:32px;box-shadow:0 24px 60px rgba(0,0,0,.24);animation:rise .26s cubic-bezier(.2,.8,.3,1);will-change:transform,opacity}
.modal__box.voice-box{max-width:400px}
@keyframes rise{from{opacity:0;transform:translateY(18px) scale(.98)}to{opacity:1;transform:none}}
.modal__x{position:absolute;top:14px;right:16px;width:32px;height:32px;border-radius:8px;font-size:22px;line-height:1;color:var(--ink-3);transition:.2s;z-index:3}
.modal__x:hover{background:var(--bg-2);color:var(--ink)}
html.modal-open{overflow:hidden}

.sip-host{position:absolute;width:0;height:0;overflow:hidden;opacity:0;pointer-events:none}

/* WebRTC 语音测试面板 */
.vcall{display:flex;flex-direction:column;align-items:center;min-height:460px;padding:8px 4px 0}
.vcall__head{width:100%;padding:4px 28px 16px 0;margin-bottom:8px;border-bottom:1px solid #eef2ff}
.vcall__name{font-size:17px;font-weight:600;color:var(--ink);line-height:1.4}
.vcall__tag{display:inline-flex;align-items:center;gap:6px;margin-top:8px;padding:4px 12px;border-radius:99px;font-size:12px;color:#1668FF;background:linear-gradient(90deg,rgba(22,104,255,.08),rgba(0,210,184,.1));border:1px solid rgba(22,104,255,.16)}
.vcall__tag i{width:6px;height:6px;border-radius:50%;background:linear-gradient(135deg,#1668FF,#00D2B8)}
.vcall__body{flex:1;width:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:8px 0 16px}
.vcall__ring{width:156px;height:156px;border-radius:50%;padding:3px;background:linear-gradient(135deg,#1668FF 0%,#5ac8fa 48%,#00D2B8 100%);box-shadow:0 0 40px rgba(22,104,255,.22),0 0 80px rgba(0,210,184,.1);animation:vcall-breathe 3s ease-in-out infinite}
.vcall__ring.is-ringing{animation:vcall-ring-pulse 1.2s ease-in-out infinite}
.vcall__ring.is-active{animation:vcall-breathe 2.4s ease-in-out infinite}
.vcall__ring-inner{width:100%;height:100%;border-radius:50%;background:radial-gradient(circle at 50% 38%,#fff 0%,#f8fafc 58%,#f1f5f9 100%);display:flex;align-items:center;justify-content:center}
.vcall__core{width:72px;height:72px;border-radius:50%;background:radial-gradient(circle at 35% 30%,rgba(255,255,255,.95) 0%,rgba(22,104,255,.18) 55%,rgba(0,210,184,.22) 100%)}
.vcall__timer{margin-top:24px;font-size:30px;font-weight:600;letter-spacing:3px;color:var(--ink);font-variant-numeric:tabular-nums}
.vcall__status{margin-top:12px;min-height:22px;font-size:14px;color:var(--ink-3);text-align:center;line-height:1.5;padding:4px 14px;border-radius:99px}
.vcall__status.is-incoming{color:#2563eb;background:rgba(37,99,235,.08);border:1px solid rgba(37,99,235,.14)}
.vcall__status.is-active{color:#047857;background:rgba(16,185,129,.08);border:1px solid rgba(16,185,129,.16)}
.vcall__bars{display:flex;align-items:flex-end;justify-content:center;gap:5px;margin-top:20px;height:18px}
.vcall__bars i{width:7px;height:7px;border-radius:2px;background:rgba(22,104,255,.16)}
.vcall.is-active .vcall__bars i{animation:vcall-level 1s ease-in-out infinite}
.vcall.is-active .vcall__bars i:nth-child(2){animation-delay:.12s}
.vcall.is-active .vcall__bars i:nth-child(3){animation-delay:.24s}
.vcall.is-active .vcall__bars i:nth-child(4){animation-delay:.36s}
.vcall.is-active .vcall__bars i:nth-child(5){animation-delay:.48s}
.vcall.is-active .vcall__bars i:nth-child(6){animation-delay:.6s}
.vcall__acts{width:100%;display:flex;align-items:center;justify-content:center;gap:52px;padding:14px 0 8px}
.vcall__btn{display:flex;flex-direction:column;align-items:center;gap:8px;border:0;background:transparent;cursor:pointer;padding:0;color:var(--ink-3);font-size:12px;font-weight:500}
.vcall__ico{width:58px;height:58px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:transform .2s,box-shadow .2s}
.vcall__ico svg{width:24px;height:24px;fill:#fff}
.vcall__btn--answer .vcall__ico{background:linear-gradient(135deg,rgba(34,197,94,.85),rgba(22,163,74,.9));box-shadow:0 4px 16px rgba(34,197,94,.28)}
.vcall__btn--answer.is-highlight .vcall__ico{background:linear-gradient(135deg,#34d399,#22c55e);box-shadow:0 6px 24px rgba(34,197,94,.45),0 0 0 3px rgba(34,197,94,.15);animation:vcall-answer-glow 1.2s ease-in-out infinite}
.vcall__btn--answer:disabled{cursor:not-allowed;opacity:.72}
.vcall__btn--answer:disabled .vcall__ico{background:#e2e8f0;box-shadow:none;animation:none}
.vcall__btn--answer:disabled .vcall__ico svg{fill:#94a3b8}
.vcall__btn--hangup .vcall__ico{background:linear-gradient(135deg,#fb7185,#ef4444);box-shadow:0 4px 16px rgba(239,68,68,.32)}
.vcall__ico--hang{transform:rotate(135deg)}
.vcall__btn:not(:disabled):hover .vcall__ico{transform:translateY(-2px)}
.vcall__btn--hangup:not(:disabled):hover .vcall__ico{transform:rotate(135deg) translateY(-2px)}
.vcall__foot{margin-top:8px;font-size:11px;color:#94a3b8;text-align:center}
@keyframes vcall-breathe{0%,100%{transform:scale(1)}50%{transform:scale(1.03)}}
@keyframes vcall-ring-pulse{0%,100%{transform:scale(1);box-shadow:0 0 40px rgba(22,104,255,.22),0 0 80px rgba(0,210,184,.1)}50%{transform:scale(1.05);box-shadow:0 0 56px rgba(22,104,255,.4),0 0 96px rgba(0,210,184,.18)}}
@keyframes vcall-answer-glow{0%,100%{box-shadow:0 6px 24px rgba(34,197,94,.45),0 0 0 3px rgba(34,197,94,.15)}50%{box-shadow:0 8px 32px rgba(34,197,94,.6),0 0 0 5px rgba(34,197,94,.1)}}
@keyframes vcall-level{0%,100%{height:7px;background:rgba(22,104,255,.22)}50%{height:16px;background:linear-gradient(180deg,#5ac8fa,#1668FF)}}

/* toast */
#toast{position:fixed;left:50%;bottom:40px;transform:translate(-50%,20px);background:var(--ink);color:#fff;font-size:14px;padding:12px 22px;border-radius:10px;opacity:0;pointer-events:none;transition:.25s;z-index:200;max-width:90vw;text-align:center}
#toast.show{opacity:1;transform:translate(-50%,0)}

/* reveal + stagger */
.rv{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s ease}
.rv.in{opacity:1;transform:none}
.js-stag > *{opacity:0;transform:translateY(20px);transition:opacity .55s ease,transform .55s ease}
.js-stag.in > *{opacity:1;transform:none}
.js-stag.in > *:nth-child(1){transition-delay:.00s}
.js-stag.in > *:nth-child(2){transition-delay:.06s}
.js-stag.in > *:nth-child(3){transition-delay:.12s}
.js-stag.in > *:nth-child(4){transition-delay:.18s}
.js-stag.in > *:nth-child(5){transition-delay:.24s}
.js-stag.in > *:nth-child(6){transition-delay:.30s}
.js-stag.in > *:nth-child(7){transition-delay:.36s}
.js-stag.in > *:nth-child(8){transition-delay:.42s}
.js-stag.in > *:nth-child(9){transition-delay:.48s}

/* 3D tilt + cursor spotlight */
.tilt{transform-style:preserve-3d;will-change:transform}
.tilt::after{content:"";position:absolute;inset:0;border-radius:inherit;background:radial-gradient(circle at var(--mx,50%) var(--my,50%),rgba(22,104,255,.12),transparent 45%);opacity:0;transition:opacity .3s;pointer-events:none;z-index:1}
.tilt:hover::after{opacity:1}

/* responsive */
@media(max-width:1080px){
  .hero__in{grid-template-columns:1fr;gap:40px}
  .hero h1{font-size:42px}
  .abil{grid-template-columns:repeat(3,1fr)}
  .certs{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(3,1fr);gap:22px 12px}
  .step:nth-child(3n)::before{display:none}
  .footer__in{grid-template-columns:1fr 1fr}
  .tech-illo{opacity:.25}
}
@media(max-width:860px){
  :root{--sec:48px}
  .nav__links{display:none}
  .nav__toggle{display:flex}
  .nav.is-open .nav__links{display:flex;flex-direction:column;position:absolute;top:var(--nav-h);left:0;right:0;background:#fff;padding:16px 24px 22px;gap:16px;border-bottom:1px solid var(--line);box-shadow:0 10px 24px rgba(15,27,45,.08)}
  .nav__acts .btn--sm:first-child{display:none}
  .section{padding:var(--sec) 0}
  .h2{font-size:26px}
  .center .h2::after{margin-top:12px}
  .hero{padding:44px 0 56px}
  .hero h1{font-size:32px}
  .g2,.g3,.g4,.access,.takeover{grid-template-columns:1fr}
  .takeover__side--bad{border-right:none;border-bottom:1px solid var(--line)}
  .abil{grid-template-columns:repeat(2,1fr)}
  .abil__item:last-child{grid-column:1/-1}
  .steps{grid-template-columns:repeat(2,1fr)}
  .step:nth-child(n)::before{display:none}
  .form-row{flex-direction:column}
  .footer__in{grid-template-columns:1fr;gap:26px}
  .phone{width:100%;max-width:340px}
  .tech-illo{display:none}
  .hero__glow{display:none}
}

/* ============================================================
   站点统一顶部导航（与首页 site-header 视觉一致）
   作用域限定在 .site-header 内，避免与落地页自有的 .nav/.hero/.container 等类名冲突
   ============================================================ */
html{scroll-padding-top:92px}
.site-header{
  --blue:#0057c1; --cyan:#16b3ff; --muted:#414755; --ink:#191c1e;
  --line:#d9dee8; --soft:#f7f9fc;
  position:sticky; top:0; z-index:120;
  height:80px;
  background:rgba(247,249,252,.78);
  backdrop-filter:blur(16px);
  border-bottom:1px solid rgba(217,222,232,.8);
  box-shadow:0 10px 30px rgba(22,34,51,.04);
}
.site-header .container{width:min(1200px,calc(100% - 48px));margin:0 auto}
.site-header .sh-row{display:grid;grid-template-columns:168px 1fr 118px;align-items:center;height:80px;gap:24px}
.site-header .brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:24px;color:var(--ink)}
.site-header .brand-mark{display:grid;place-items:center;width:36px;height:36px;color:#fff;background:linear-gradient(135deg,var(--blue),var(--cyan));border-radius:8px;font-size:13px;box-shadow:0 8px 22px rgba(0,87,193,.28)}
.site-header .nav-links{display:flex;justify-content:center;gap:22px;color:var(--muted);font-size:15px;white-space:nowrap}
.site-header .nav-links a{position:relative;padding:4px 0}
.site-header .nav-links a:hover,
.site-header .nav-links a.active{color:var(--blue)}
.site-header .nav-dropdown{position:relative;display:inline-flex;align-items:center}
.site-header .nav-dropdown-toggle{display:inline-flex;align-items:center;gap:6px;cursor:pointer}
.site-header .nav-dropdown-toggle::after{content:"";width:6px;height:6px;border-right:1.5px solid currentColor;border-bottom:1.5px solid currentColor;transform:translateY(-2px) rotate(45deg);transition:transform .2s ease}
.site-header .nav-dropdown:hover .nav-dropdown-toggle,
.site-header .nav-dropdown:focus-within .nav-dropdown-toggle,
.site-header .nav-dropdown.active .nav-dropdown-toggle{color:var(--blue)}
.site-header .nav-dropdown:hover .nav-dropdown-toggle::after,
.site-header .nav-dropdown:focus-within .nav-dropdown-toggle::after{transform:translateY(1px) rotate(225deg)}
.site-header .nav-dropdown-menu{position:absolute;left:50%;top:calc(100% + 18px);z-index:30;display:grid;gap:6px;min-width:210px;padding:10px;border:1px solid rgba(193,198,215,.75);border-radius:12px;background:rgba(255,255,255,.96);box-shadow:0 22px 46px rgba(22,34,51,.16);opacity:0;pointer-events:none;transform:translate(-50%,8px);transition:opacity .2s ease,transform .2s ease;backdrop-filter:blur(16px)}
.site-header .nav-dropdown-menu::before{content:"";position:absolute;left:0;right:0;top:-18px;height:18px}
.site-header .nav-dropdown:hover .nav-dropdown-menu,
.site-header .nav-dropdown:focus-within .nav-dropdown-menu{opacity:1;pointer-events:auto;transform:translate(-50%,0)}
.site-header .nav-dropdown-menu a{display:block;padding:11px 12px;border-radius:8px;color:var(--muted)}
.site-header .nav-dropdown-menu a:hover{color:var(--blue);background:#edf5ff}
.site-header .nav-links>a.active::after{content:"";position:absolute;left:0;right:0;bottom:-8px;height:2px;border-radius:999px;background:linear-gradient(90deg,var(--blue),var(--cyan))}
.site-header .nav-dropdown.active .nav-dropdown-toggle::before{content:"";position:absolute;left:0;right:0;bottom:-8px;height:2px;border-radius:999px;background:linear-gradient(90deg,var(--blue),var(--cyan))}
.site-header .nav-cta{justify-self:end;padding:11px 22px;color:#fff;background:var(--blue);border-radius:8px;font-weight:700;transition:transform .22s ease,box-shadow .22s ease,background .22s ease}
.site-header .nav-cta:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(0,87,193,.22);background:#0068df}
.site-header .nav-toggle{display:none}

@media(max-width:920px){
  .site-header .container{width:min(100% - 32px,720px)}
  .site-header .sh-row{grid-template-columns:1fr auto}
  .site-header .nav-toggle{display:inline-grid;gap:5px;width:42px;height:42px;place-content:center;border:1px solid var(--line);background:#fff;border-radius:8px}
  .site-header .nav-toggle span{display:block;width:18px;height:2px;background:var(--ink)}
  .site-header .nav-links,
  .site-header .nav-cta{display:none}
  .site-header .nav-links.open{position:absolute;left:16px;right:16px;top:72px;display:grid;gap:10px;padding:18px;background:#fff;border:1px solid var(--line);border-radius:12px;box-shadow:0 18px 40px rgba(22,34,51,.14)}
  .site-header .nav-dropdown{display:grid;gap:8px}
  .site-header .nav-dropdown-toggle{width:100%}
  .site-header .nav-dropdown-menu{position:static;display:grid;min-width:0;padding:6px 0 6px 14px;border:0;border-left:2px solid #d9e2ff;border-radius:0;background:transparent;box-shadow:none;opacity:1;pointer-events:auto;transform:none;backdrop-filter:none}
  .site-header .nav-dropdown-menu::before,
  .site-header .nav-dropdown.active .nav-dropdown-toggle::before{display:none}
  .site-header .nav-dropdown-menu a{padding:8px 10px;background:#f7f9fc}
  .site-header .nav-links>a.active::after{display:none}
}