/* ============ Tokens ============ */
:root{
  --bg:#FBFAF8;
  --surface:#FFFFFF;
  --surface-2:#F4F1EB;
  --ink:#16181D;
  --ink-2:#3D424B;
  --muted:#71787F;
  --line:#E7E3DC;
  --line-2:#D8D3C9;
  --accent:#0ABAB5;
  --accent-2:#067F7C;
  --accent-soft:#DFF3F2;
  --warm:#C2643A;
  --warm-soft:#FBEEE6;
  --dark:#081A1E;
  --dark-2:#0E262B;
  --r-s:10px; --r-m:16px; --r-l:24px;
  --sh-1:0 1px 2px rgba(22,24,29,.05), 0 4px 14px rgba(22,24,29,.04);
  --sh-2:0 10px 34px rgba(22,24,29,.09);
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --serif:"Songti SC","Source Han Serif SC","Noto Serif SC",Georgia,"Times New Roman",serif;
  --nav-h:68px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--bg);color:var(--ink);
  font-family:var(--sans);font-size:16px;line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
img,svg,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3{font-family:var(--serif);font-weight:700;letter-spacing:.01em;line-height:1.25;margin:0}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
button{font:inherit;cursor:pointer;border:none;background:none;color:inherit}
code{font-family:ui-monospace,"SFMono-Regular",Consolas,monospace;font-size:.86em}
::selection{background:var(--accent);color:#fff}

.wrap{width:min(1200px,100% - 48px);margin:0 auto}
.center{text-align:center;margin-top:38px}
.is-hidden{display:none !important}

/* ============ Buttons ============ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:100px;font-weight:600;font-size:15px;
  transition:.22s cubic-bezier(.4,0,.2,1);white-space:nowrap;
}
.btn-sm{padding:8px 16px;font-size:14px}
.btn-lg{padding:15px 30px;font-size:16px}
.btn-primary{background:var(--accent);color:#fff;box-shadow:0 4px 16px rgba(6,127,124,.22)}
.btn-primary:hover{background:#0D3D42;transform:translateY(-2px);box-shadow:0 8px 24px rgba(6,127,124,.3)}
.btn-ghost{border:1.5px solid var(--line-2);color:var(--ink);background:transparent}
.btn-ghost:hover{border-color:var(--accent);color:var(--accent);background:#fff}
.btn-outline{border:1.5px solid var(--accent);color:var(--accent);background:transparent}
.btn-outline:hover{background:var(--accent);color:#fff}
.btn-light{border:1px solid rgba(255,255,255,.28);color:#fff;background:rgba(255,255,255,.06)}
.btn-light:hover{background:rgba(255,255,255,.16)}
.dot{width:7px;height:7px;border-radius:50%;background:var(--warm);box-shadow:0 0 0 4px rgba(194,100,58,.18)}

/* ============ Nav ============ */
.nav{
  position:sticky;top:0;z-index:80;height:var(--nav-h);
  background:rgba(251,250,248,.82);backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;transition:.25s;
}
.nav.is-stuck{border-bottom-color:var(--line);box-shadow:0 2px 20px rgba(22,24,29,.05)}
.nav-inner{
  width:min(1200px,100% - 48px);margin:0 auto;height:100%;
  display:flex;align-items:center;gap:28px;
}
.brand{display:flex;align-items:center;gap:11px;margin-right:auto}
.brand-mark{
  width:36px;height:36px;border-radius:10px;background:var(--accent);color:#fff;
  display:grid;place-items:center;font-family:var(--serif);font-weight:700;font-size:19px;
}
.brand-text{display:flex;flex-direction:column;line-height:1.25}
.brand-text strong{font-size:15.5px;letter-spacing:.02em}
.brand-text em{font-style:normal;font-size:12px;color:var(--muted);letter-spacing:.06em}
.nav-links{display:flex;gap:26px;font-size:14.5px;color:var(--ink-2)}
.nav-links a{position:relative;padding:4px 0;transition:.2s}
.nav-links a::after{
  content:"";position:absolute;left:0;right:100%;bottom:0;height:1.5px;
  background:var(--accent);transition:right .25s;
}
.nav-links a:hover{color:var(--accent)}
.nav-links a:hover::after{right:0}
.nav-toggle{display:none;font-size:22px}

/* ============ Hero ============ */
.hero{position:relative;padding:76px 0 84px;overflow:hidden}
.hero-bg{
  position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(900px 480px at 88% 8%, var(--accent-soft) 0%, transparent 62%),
    radial-gradient(700px 420px at 6% 92%, var(--warm-soft) 0%, transparent 60%);
}
.hero-inner{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.eyebrow{
  display:inline-block;font-size:12.5px;letter-spacing:.16em;color:var(--accent);
  font-weight:700;text-transform:uppercase;margin-bottom:16px;
}
.display{font-size:clamp(34px,4.4vw,58px);letter-spacing:-.01em}
.display .hl{
  color:var(--accent);
  background:linear-gradient(180deg,transparent 68%,rgba(47,127,115,.18) 68%);
}
.lede{margin-top:22px;font-size:17px;color:var(--ink-2);max-width:56ch}
.lede strong{color:var(--ink);font-weight:700}
.hero-actions{display:flex;gap:14px;margin-top:32px;flex-wrap:wrap}
.hero-try{display:flex;align-items:center;gap:8px;flex-wrap:wrap;margin-top:26px}
.hero-try li span{font-size:13px;color:var(--muted);margin-right:2px}
.chip{
  padding:7px 15px;border-radius:100px;border:1px solid var(--line-2);
  background:#fff;font-size:13.5px;color:var(--ink-2);transition:.2s;
}
.chip:hover{border-color:var(--accent);color:var(--accent);transform:translateY(-1px)}
.chip-quiet{background:transparent}
.hero-stats{
  display:flex;gap:34px;margin-top:40px;padding-top:28px;border-top:1px solid var(--line);
}
.hero-stats div{display:flex;flex-direction:column}
.hero-stats b{font-family:var(--serif);font-size:28px;line-height:1.1;color:var(--accent)}
.hero-stats span{font-size:12.5px;color:var(--muted);margin-top:4px}

/* --- 数字人卡片 --- */
.hero-human{position:relative}
.human-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-l);
  box-shadow:var(--sh-2);overflow:hidden;
}
.human-stage{
  position:relative;aspect-ratio:3/4;background:linear-gradient(165deg,#EFF4F5,#E1EAEB);
  display:grid;place-items:center;overflow:hidden;
}
.human-media{width:100%;height:100%;object-fit:cover}
.human-fallback{width:56%;opacity:.5}
.human-live{
  position:absolute;top:14px;left:14px;display:flex;align-items:center;gap:7px;
  background:rgba(255,255,255,.92);backdrop-filter:blur(6px);
  padding:6px 13px;border-radius:100px;font-size:12.5px;font-weight:600;color:var(--accent);
}
.pulse{width:7px;height:7px;border-radius:50%;background:var(--warm);animation:pulse 1.8s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(194,100,58,.5)}70%{box-shadow:0 0 0 10px rgba(194,100,58,0)}100%{box-shadow:0 0 0 0 rgba(194,100,58,0)}}
.human-tip{
  position:absolute;left:14px;right:14px;bottom:14px;
  background:rgba(18,26,24,.78);color:#fff;backdrop-filter:blur(6px);
  padding:11px 14px;border-radius:14px;font-size:13.5px;line-height:1.55;
}
.human-meta{
  padding:18px 20px;display:flex;align-items:center;gap:14px;justify-content:space-between;
}
.human-meta strong{display:block;font-size:15px}
.human-meta span{display:block;font-size:12.5px;color:var(--muted);line-height:1.5;margin-top:2px}
.human-note{margin-top:12px;font-size:12.5px;color:var(--muted);text-align:center}

/* ============ Sections ============ */
.section{padding:96px 0}
.section-tint{background:var(--surface-2)}
.section-dark{background:var(--dark);color:#F0F4F4}
.sec-head{max-width:720px;margin-bottom:52px}
.h2{font-size:clamp(26px,3vw,38px)}
.h2 strong{color:var(--accent)}
.section-dark .h2 strong{color:#7CD8D4}
.sec-sub{margin-top:16px;font-size:16.5px;color:var(--muted)}
.section-dark .sec-sub{color:#99A7AB}
.section-dark .eyebrow{color:#7CD8D4}
.sec-head-light{margin-bottom:44px}

/* ============ Cards ============ */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
/* 文章列表为奇数篇时，最后一篇跨两列，避免尾部留空 */
.post-wide{grid-column:1/-1}
.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-m);
  padding:30px 28px;transition:.28s cubic-bezier(.4,0,.2,1);
}
.card-lift:hover{transform:translateY(-5px);box-shadow:var(--sh-2);border-color:var(--line-2)}
.card-ic{font-size:26px;margin-bottom:16px}
.card h3{font-size:20px;margin-bottom:10px}
.card p{font-size:14.8px;color:var(--ink-2)}
.mini{margin-top:16px;display:flex;flex-direction:column;gap:7px}
.mini li{
  font-size:13.6px;color:var(--muted);padding-left:16px;position:relative;
}
.mini li::before{
  content:"";position:absolute;left:0;top:10px;width:6px;height:6px;
  border-radius:2px;background:var(--accent-2);opacity:.55;
}

/* ============ Ask bar ============ */
.askbar{margin-top:44px}
.askbar-inner{
  display:flex;align-items:center;gap:14px;background:var(--surface);
  border:1px solid var(--line);border-radius:100px;padding:9px 9px 9px 26px;
  box-shadow:var(--sh-1);flex-wrap:wrap;
}
.askbar-label{font-size:13.5px;color:var(--muted);white-space:nowrap}
.askbar-inner input{
  flex:1;min-width:200px;border:none;outline:none;background:transparent;
  font:inherit;font-size:15px;color:var(--ink);
}
.askbar-inner input::placeholder{color:#A8AEB4}

/* ============ Courses ============ */
.course{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-m);
  padding:26px;display:flex;flex-direction:column;transition:.26s;
}
.course:hover{transform:translateY(-4px);box-shadow:var(--sh-2)}
.course-free{background:linear-gradient(165deg,#fff,#EAF6F5);border-color:var(--accent-2)}
.course-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.tag{
  padding:4px 11px;border-radius:6px;font-size:12px;font-weight:700;letter-spacing:.03em;
}
.tag-a{background:var(--accent-soft);color:var(--accent)}
.tag-b{background:#F2F0FA;color:#5B4A8C}
.tag-c{background:var(--warm-soft);color:var(--warm)}
.tag-d{background:#EAF0F8;color:#3B5B8C}
.tag-e{background:#F7EFE6;color:#8A6A2F}
.tag-f{background:var(--accent);color:#fff}
.course-lv{font-size:12.5px;color:var(--muted)}
.course h3{font-size:19px;margin-bottom:10px}
.course p{font-size:14.5px;color:var(--ink-2);flex:1}
.course .mini{margin-top:14px}
.course-foot{
  margin-top:20px;padding-top:16px;border-top:1px solid var(--line);
  display:flex;align-items:center;justify-content:space-between;
}
.course-foot b{font-family:var(--serif);font-size:22px;color:var(--accent)}

/* ============ Posts ============ */
.post{
  display:block;background:var(--surface);border:1px solid var(--line);
  border-radius:var(--r-m);padding:28px 30px;transition:.26s;
}
.post:hover{border-color:var(--accent);transform:translateY(-3px);box-shadow:var(--sh-2)}
.post-cover{margin:-28px -30px 20px;height:168px;overflow:hidden;border-radius:var(--r-m) var(--r-m) 0 0;background:var(--surface-2)}
.post-cover img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .35s}
.post:hover .post-cover img{transform:scale(1.03)}
.post-wide .post-cover{height:230px}
.post-meta{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.post-meta time{font-size:12.5px;color:var(--muted)}
.post h3{font-size:21px;margin-bottom:10px;line-height:1.4}
.post p{font-size:14.8px;color:var(--ink-2)}
.more{display:inline-block;margin-top:16px;font-size:14px;font-weight:600;color:var(--accent)}

/* ============ Pyramid / 知识体系 ============ */
.pyramid{display:flex;flex-direction:column;gap:14px}
.pyr{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-m);
  padding:26px 30px;transition:.26s;position:relative;overflow:hidden;
}
.pyr::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:var(--accent);
  opacity:calc(0.25 + var(--o,1) * 0.15);
}
.pyr[data-lvl="1"]{--o:4}.pyr[data-lvl="2"]{--o:3}.pyr[data-lvl="3"]{--o:2}.pyr[data-lvl="4"]{--o:1}
.pyr:hover{transform:translateX(4px);box-shadow:var(--sh-1)}
.pyr-h{display:flex;align-items:center;gap:14px;margin-bottom:10px}
.pyr-n{
  font-family:var(--serif);font-size:13px;font-weight:700;letter-spacing:.05em;
  color:var(--accent);background:var(--accent-soft);padding:3px 10px;border-radius:6px;
}
.pyr-h h3{font-size:19px}
.pyr p{font-size:14.6px;color:var(--ink-2)}
.pyr-tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
.pyr-tags span{
  font-size:12.5px;color:var(--muted);background:var(--surface-2);
  padding:4px 11px;border-radius:100px;
}

/* ============ Apps ============ */
.appgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.app{
  display:flex;align-items:center;gap:16px;background:var(--surface);
  border:1px solid var(--line);border-radius:var(--r-m);padding:20px 22px;transition:.24s;
}
.app:hover{transform:translateY(-3px);box-shadow:var(--sh-2);border-color:var(--line-2)}
.app-ic{width:44px;height:44px;border-radius:12px;display:grid;place-items:center;font-size:20px;flex-shrink:0}
.app h3{font-size:16px;margin-bottom:3px;font-family:var(--sans);font-weight:700}
.app p{font-size:13.2px;color:var(--muted);line-height:1.55}
.app-fit{
  margin-left:auto;font-size:12px;color:var(--accent);background:var(--accent-soft);
  padding:4px 10px;border-radius:100px;white-space:nowrap;flex-shrink:0;
}

/* ============ Agents ============ */
.agent-tabs{display:flex;gap:10px;margin-bottom:28px;flex-wrap:wrap}
.atab{
  padding:9px 20px;border-radius:100px;border:1px solid rgba(255,255,255,.2);
  color:#C2DEE0;font-size:14px;transition:.22s;
}
.atab:hover{color:#fff;border-color:rgba(255,255,255,.45)}
.atab.is-on{background:#7CD8D4;color:#0E191B;border-color:#7CD8D4;font-weight:600}
.agent-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.agent{
  background:var(--dark-2);border:1px solid rgba(255,255,255,.09);
  border-radius:var(--r-m);padding:24px 26px;transition:.24s;
}
.agent:hover{border-color:rgba(124,216,212,.5);transform:translateY(-3px)}
.agent-h{display:flex;align-items:center;gap:12px;margin-bottom:10px}
.agent-h h3{font-size:18px;color:#fff;font-family:var(--sans);font-weight:700}
.badge{
  font-size:11.5px;padding:3px 9px;border-radius:5px;background:rgba(124,216,212,.16);color:#7CD8D4;
}
.agent p{font-size:14.3px;color:#A0C9CD}
.agent-foot{
  margin-top:18px;padding-top:14px;border-top:1px solid rgba(255,255,255,.09);
  display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;
}
.agent-foot code{color:#7D8B8E;background:rgba(255,255,255,.05);padding:4px 9px;border-radius:5px}
.agent-foot span{display:flex;gap:8px}

.install{
  margin-top:44px;background:rgba(255,255,255,.04);border:1px dashed rgba(255,255,255,.16);
  border-radius:var(--r-m);padding:28px 30px;
}
.install h3{font-size:18px;color:#fff;margin-bottom:18px;font-family:var(--sans)}
.install ol{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.install li{display:flex;flex-direction:column;gap:4px}
.install li b{color:#7CD8D4;font-size:15px}
.install li span{font-size:13.6px;color:#99A7AB}
.install-note{margin-top:20px;font-size:13px;color:#7D8B8E}

/* ============ About ============ */
.about{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:start}
.about-role{margin:10px 0 20px;font-size:15px;color:var(--accent);font-weight:600}
.about-copy p{color:var(--ink-2);font-size:16px}
.about-keys{margin-top:22px;display:flex;flex-direction:column;gap:9px}
.about-keys li{
  font-size:14.5px;color:var(--ink-2);padding-left:24px;position:relative;
}
.about-keys li::before{content:"✓";position:absolute;left:0;color:var(--accent);font-weight:700}
.about-cta{display:flex;gap:14px;margin-top:30px;flex-wrap:wrap}
.about-card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-l);
  padding:22px;box-shadow:var(--sh-1);
}
.about-photo{
  aspect-ratio:1/1;border-radius:var(--r-m);background:var(--surface-2);
  display:grid;place-items:center;color:var(--muted);font-size:14px;
  border:1px dashed var(--line-2);margin-bottom:18px;
}
.about-contact{display:flex;flex-direction:column}
.about-contact div{
  display:flex;justify-content:space-between;align-items:center;
  padding:13px 4px;border-bottom:1px solid var(--line);font-size:14.5px;
}
.about-contact div:last-child{border-bottom:none}
.about-contact span{color:var(--muted)}
.about-contact b{font-weight:600}

/* ============ Footer ============ */
.footer{border-top:1px solid var(--line);padding:30px 0;background:var(--surface)}
.footer-inner{display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.icp{margin-left:10px;color:var(--muted);font-size:12.5px}
.footer-inner div{font-size:13.5px;color:var(--muted)}
.footer nav{display:flex;gap:22px;font-size:13.5px;color:var(--muted)}
.footer nav a:hover{color:var(--accent)}

/* ============ Chat drawer ============ */
.chat-mask{
  position:fixed;inset:0;background:rgba(18,26,24,.42);backdrop-filter:blur(3px);
  opacity:0;pointer-events:none;transition:opacity .28s;z-index:100;
}
.chat-mask.is-on{opacity:1;pointer-events:auto}
.chat{
  position:fixed;top:0;right:0;bottom:0;width:min(430px,100%);z-index:101;
  background:var(--surface);display:flex;flex-direction:column;
  transform:translateX(102%);transition:transform .34s cubic-bezier(.4,0,.2,1);
  box-shadow:-14px 0 44px rgba(22,24,29,.15);
}
.chat.is-on{transform:translateX(0)}
.chat-h{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:16px 20px;border-bottom:1px solid var(--line);
}
.chat-who{display:flex;align-items:center;gap:12px}
.chat-av{width:42px;height:42px;border-radius:50%;overflow:hidden;flex-shrink:0;background:var(--accent-soft)}
.chat-av img{width:100%;height:100%;object-fit:cover;display:block}
.chat-who strong{display:block;font-size:15px}
.chat-who span{display:block;font-size:12px;color:var(--muted)}
.chat-close{font-size:18px;color:var(--muted);width:32px;height:32px;border-radius:50%}
.chat-close:hover{background:var(--surface-2);color:var(--ink)}
.chat-body{flex:1;overflow-y:auto;padding:22px 20px;display:flex;flex-direction:column;gap:14px}
.msg{display:flex;gap:9px;align-items:flex-end}
.msg-ai{justify-content:flex-start}
.msg-me{justify-content:flex-end}
.msg-avatar{
  width:34px;height:34px;flex-shrink:0;border-radius:50%;object-fit:cover;
  border:1px solid var(--line);background:var(--surface-2);margin-bottom:1px;
}
.bubble{
  max-width:78%;padding:13px 16px;border-radius:16px;font-size:14.6px;line-height:1.7;
  background:var(--surface-2);color:var(--ink);border-top-left-radius:5px;
}
.speak{
  display:inline-flex;align-items:center;gap:5px;margin-top:10px;
  padding:4px 11px;border-radius:999px;background:transparent;font-family:inherit;
  border:1px solid var(--line-2);color:var(--muted);font-size:12.2px;
  cursor:pointer;transition:.18s;
}
.speak:hover{border-color:var(--accent);color:var(--accent);background:var(--surface)}
.speak.on{border-color:var(--accent);color:var(--accent);background:var(--surface)}
.speak.off{opacity:.5;cursor:not-allowed}
.speak svg{flex-shrink:0}
.msg-me .bubble{background:var(--accent);color:#fff;border-top-left-radius:16px;border-top-right-radius:5px}
.bubble b{font-weight:700}
.bubble ul{margin:8px 0 0;display:flex;flex-direction:column;gap:5px}
.bubble li{padding-left:15px;position:relative}
.bubble li::before{content:"·";position:absolute;left:3px;font-weight:700}
/* ── Markdown 渲染（模型回复）────────────────── */
.bubble p{margin:0 0 8px}
.bubble p:last-of-type{margin-bottom:0}
.bubble h3,.bubble h4,.bubble h5{font-size:14.6px;font-weight:700;margin:12px 0 6px}
.bubble h3:first-child,.bubble h4:first-child{margin-top:0}
.bubble ol{margin:8px 0 0;display:flex;flex-direction:column;gap:5px;padding-left:19px;list-style:decimal}
.bubble ol li{padding-left:0}
.bubble ol li::before{content:none}
.bubble code{padding:1px 5px;border-radius:5px;background:var(--surface);font-size:13px}
.md-table{margin:10px 0;overflow-x:auto;-webkit-overflow-scrolling:touch}
.md-table table{border-collapse:collapse;width:100%;font-size:13.4px}
.md-table th,.md-table td{border:1px solid var(--line-2);padding:6px 9px;text-align:left;vertical-align:top}
.md-table th{background:var(--surface);font-weight:700;white-space:nowrap}
.md-table td b{font-weight:700}
.bubble.streaming::after{
  content:"";display:inline-block;width:6px;height:14px;margin-left:2px;
  background:var(--accent);vertical-align:-2px;animation:blink .9s steps(2) infinite;
}
@keyframes blink{0%,50%{opacity:1}51%,100%{opacity:0}}
.typing{display:flex;gap:4px;padding:15px 16px}
.typing i{width:6px;height:6px;border-radius:50%;background:var(--muted);animation:tp 1.3s infinite}
.typing i:nth-child(2){animation-delay:.18s}.typing i:nth-child(3){animation-delay:.36s}
@keyframes tp{0%,60%,100%{opacity:.28;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}
.chat-chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:2px}
.chat-chips .chip{font-size:13px;padding:6px 13px}
.chat-input{
  display:flex;gap:8px;align-items:flex-end;padding:14px 16px;border-top:1px solid var(--line);
}
.chat-input textarea{
  flex:1;resize:none;border:1px solid var(--line-2);border-radius:14px;padding:11px 14px;
  font:inherit;font-size:14.6px;line-height:1.6;outline:none;max-height:130px;background:var(--surface);
}
.chat-input textarea:focus{border-color:var(--accent)}
/* 麦克风：语音优先输入 */
.mic{
  width:44px;height:44px;flex-shrink:0;border-radius:50%;border:1px solid var(--line-2);
  background:var(--surface);color:var(--accent);display:flex;align-items:center;justify-content:center;
  transition:.2s;
}
.mic svg{width:21px;height:21px}
.mic:hover{border-color:var(--accent);background:rgba(6,127,124,.06)}
.mic.is-on{background:var(--accent);border-color:var(--accent);color:#fff;animation:pulse 1.3s infinite}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(6,127,124,.34)}50%{box-shadow:0 0 0 9px rgba(6,127,124,0)}}
/* 语音状态条 */
.voice-bar{
  display:flex;align-items:center;gap:9px;padding:9px 16px;font-size:13.4px;color:var(--accent);
  background:rgba(6,127,124,.06);border-top:1px solid var(--line);
}
.voice-bar[hidden]{display:none}
.vdot{width:8px;height:8px;border-radius:50%;background:var(--accent);animation:pulse 1.3s infinite;flex-shrink:0}
.voice-bar button{
  margin-left:auto;background:transparent;border:none;color:var(--muted);font-size:13px;
  cursor:pointer;font-family:inherit;
}
.voice-bar button:hover{color:var(--ink)}
.send{
  padding:11px 18px;border-radius:14px;background:var(--accent);color:#fff;
  font-weight:600;font-size:14px;flex-shrink:0;transition:.2s;
}
.send:hover{background:#0D3D42}
/* 开场题的选项：比普通 chip 更突出一点 */
.chat-chips.opts{margin-top:10px}
.chat-chips.opts .chip{
  background:var(--accent);color:#fff;border-color:var(--accent);font-weight:600;font-size:13.4px;
  padding:8px 15px;
}
.chat-chips.opts .chip:hover{background:#0D3D42;color:#fff;transform:translateY(-1px)}
.chat-foot{
  padding:9px 16px 12px;font-size:11.5px;color:var(--muted);text-align:center;
  border-top:1px solid var(--line);
}
.chat-foot code{background:var(--surface-2);padding:1px 5px;border-radius:4px}

.chat-fab{
  position:fixed;right:24px;bottom:24px;z-index:90;
  display:flex;align-items:center;gap:9px;padding:13px 22px;border-radius:100px;
  background:var(--accent);color:#fff;font-weight:600;font-size:15px;
  box-shadow:0 8px 26px rgba(6,127,124,.32);transition:.24s;
}
.chat-fab svg{width:20px;height:20px}
.chat-fab:hover{transform:translateY(-3px);box-shadow:0 12px 32px rgba(6,127,124,.4)}

/* ============ Reveal ============ */
.rv{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s cubic-bezier(.4,0,.2,1)}
.rv.in{opacity:1;transform:none}

/* ============ Responsive ============ */
@media (max-width:1080px){
  .hero-inner{grid-template-columns:1fr;gap:44px}
  .hero-human{max-width:420px;margin:0 auto}
  .grid-3,.appgrid{grid-template-columns:repeat(2,1fr)}
  .about{grid-template-columns:1fr;gap:40px}
}
@media (max-width:860px){
  .nav-links{display:none}
  .nav-toggle{display:block}
  .grid-3,.grid-2,.appgrid,.agent-list{grid-template-columns:1fr}
  .install ol{grid-template-columns:1fr}
  .section{padding:70px 0}
  .hero{padding:52px 0 60px}
  .hero-stats{gap:22px;flex-wrap:wrap}
  .wrap{width:min(1200px,100% - 32px)}
  .nav-inner{width:min(1200px,100% - 32px)}
  .chat-fab span{display:none}
  .chat-fab{padding:15px;border-radius:50%}
}