/* ── 海大叔 · AI新媒体IP智慧生态 · 暖色干净主题 ── */
:root{
  --bg:#FBF6EE; --bg2:#F5E9D8; --card:#ffffff; --card2:#FBF7F1;
  --ink:#2B2119; --ink2:#4A3A2B; --dim:#7C6A57; --dim2:#A8998A;
  --brand:#C2571C; --brand-d:rgba(194,87,28,.10); --brand-dd:rgba(194,87,28,.20);
  --cyan:#D99A2B; --violet:#B5703E; --gold:#E0892B; --green:#2F9E6B; --red:#C0392B;
  --line:rgba(140,95,50,.14); --line2:rgba(140,95,50,.08);
  --shadow:0 8px 28px -14px rgba(120,70,30,.20);
  --shadow-lg:0 18px 50px -22px rgba(180,100,30,.34);
  --sans:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{background:linear-gradient(160deg,#FDF9F3 0%,#F8EEE1 52%,#F3E5D2 100%) fixed;color:var(--ink);font-family:var(--sans);line-height:1.7;-webkit-font-smoothing:antialiased;overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;
  background:radial-gradient(900px 520px at 12% -6%,rgba(224,150,60,.12),transparent 60%),
             radial-gradient(760px 480px at 96% 0%,rgba(194,87,28,.07),transparent 60%)}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.wrap{width:min(1100px,100% - 44px);margin-inline:auto}
::selection{background:var(--brand-dd);color:#fff}

/* ── 导航 ── */
.nav{position:sticky;top:0;z-index:80;background:rgba(253,249,243,.88);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:14px;height:62px}
.brand{display:flex;align-items:center;gap:10px;min-width:0}
.logo{width:34px;height:34px;border-radius:10px;background:linear-gradient(135deg,#E08A2A,#C2571C);color:#fff;display:grid;place-items:center;font-weight:800;font-size:17px;box-shadow:var(--shadow)}
.brand-t b{font-size:15px;font-weight:700;display:block;line-height:1.15}
.brand-t i{font-style:normal;font-size:10.5px;color:var(--dim);letter-spacing:.04em}
.nav-links{margin-left:auto;display:flex;align-items:center;gap:4px}
.nav-links a{font-size:14px;color:var(--dim);padding:8px 12px;border-radius:9px;transition:.18s;white-space:nowrap}
.nav-links a:hover{color:var(--ink);background:rgba(194,87,28,.07)}
.nav-links a.active{color:var(--brand);background:var(--brand-d);font-weight:600}
.nav-cta{margin-left:6px;padding:8px 16px;border-radius:9px;background:var(--brand);color:#fff;font-size:13.5px;font-weight:600;transition:.18s;box-shadow:var(--shadow)}
.nav-cta:hover{transform:translateY(-1px);box-shadow:var(--shadow-lg)}
.nav-burger{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:9px;width:40px;height:38px;font-size:20px;color:var(--ink);cursor:pointer}
@media(max-width:860px){
  .nav-burger{display:block}
  .nav-cta{display:none}
  .nav-links{position:absolute;top:62px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);flex-direction:column;align-items:stretch;gap:0;padding:8px 22px 14px;display:none;box-shadow:var(--shadow)}
  .nav-links.open{display:flex}
  .nav-links a{padding:12px 8px;border-radius:8px;font-size:15px}
  .nav-links a.active{background:var(--brand-d)}
}

/* ── 通用区块 ── */
section{padding:64px 0}
.eyebrow{font-family:var(--mono);font-size:11px;letter-spacing:.22em;color:var(--brand);text-transform:uppercase;margin-bottom:12px;display:inline-block}
.h2{font-size:clamp(24px,3.6vw,34px);line-height:1.25;font-weight:800;letter-spacing:-.02em}
.lead{margin-top:14px;color:var(--dim);font-size:clamp(14px,1.6vw,16px);max-width:42em}
.center{text-align:center}
.center .lead{margin-inline:auto}

/* ── 按钮 ── */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:11px;font-size:14.5px;font-weight:600;transition:.18s;border:1px solid transparent;cursor:pointer}
.btn-primary{background:linear-gradient(100deg,#E08A2A,#C2571C);color:#fff;box-shadow:var(--shadow)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}
.btn-ghost{background:#fff;color:var(--ink);border-color:var(--line)}
.btn-ghost:hover{border-color:var(--brand-dd);color:var(--brand)}
.btn-row{display:flex;gap:12px;flex-wrap:wrap;margin-top:24px}

/* ── 卡片栅格 ── */
.grid{display:grid;gap:18px}
.grid.c2{grid-template-columns:repeat(2,1fr)}
.grid.c3{grid-template-columns:repeat(3,1fr)}
.grid.c4{grid-template-columns:repeat(4,1fr)}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:22px;box-shadow:var(--shadow);transition:.2s}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--brand-dd)}
.card h3{font-size:17px;margin-bottom:8px;display:flex;align-items:center;gap:9px}
.card p{color:var(--dim);font-size:13.5px}
.card .ic{font-size:22px}
.card .arrow{margin-top:14px;color:var(--brand);font-weight:600;font-size:13.5px}

/* ── 徽标 ── */
.badge{display:inline-flex;align-items:center;gap:6px;font-size:11.5px;font-weight:600;padding:4px 11px;border-radius:999px}
.badge.live{background:rgba(47,158,107,.12);color:#1F7A50}
.badge.live::before{content:"";width:6px;height:6px;border-radius:50%;background:#2F9E6B;box-shadow:0 0 7px #2F9E6B}
.badge.pro{background:var(--brand-d);color:var(--brand)}
.badge.soon{background:rgba(192,57,43,.12);color:#A93226}
.badge.apk{background:rgba(47,158,107,.12);color:#1F7A50}
.badge.apk::before{content:"";width:6px;height:6px;border-radius:50%;background:#2F9E6B}

/* ── 九模块（一套班子） ── */
.mods{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.mod{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px;box-shadow:var(--shadow);transition:.2s;display:flex;flex-direction:column}
.mod:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg);border-color:var(--brand-dd)}
.mod .num{font-family:var(--mono);font-size:12px;color:var(--brand);font-weight:700}
.mod h3{font-size:16.5px;margin:6px 0 6px;display:flex;align-items:center;gap:8px}
.mod p{color:var(--dim);font-size:13px;flex:1}
.mod .links{margin-top:14px;display:flex;gap:8px;flex-wrap:wrap}
.mod .links a{font-size:12.5px;font-weight:600;padding:6px 12px;border-radius:8px;border:1px solid var(--line)}
.mod .links a.try{background:var(--brand);color:#fff;border-color:var(--brand)}
.mod .links a.case{background:var(--card2);color:var(--brand)}
@media(max-width:760px){.mods{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.mods{grid-template-columns:1fr}}

/* ── 问答 UI ── */
.chat{background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);overflow:hidden;max-width:760px;margin-inline:auto}
.chat-log{height:340px;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:14px}
.chat-empty{color:var(--dim2);font-size:13.5px;text-align:center;margin:auto;line-height:1.9}
.msg{display:flex;gap:10px;align-items:flex-start}
.msg .who{flex:none;width:30px;height:30px;border-radius:9px;display:grid;place-items:center;font-size:11px;font-weight:700;color:#fff}
.msg.u{flex-direction:row-reverse}
.msg.u .who{background:linear-gradient(135deg,#E08A2A,#C2571C)}
.msg.a .who{width:auto;height:24px;padding:0 9px;border-radius:7px;margin-top:3px;
  font-size:10.5px;letter-spacing:.03em;white-space:nowrap;background:#3a2e22}
.msg .body{background:var(--card2);border:1px solid var(--line2);border-radius:12px;padding:10px 14px;font-size:14px;line-height:1.75;max-width:80%;color:var(--ink2)}
.msg.u .body{background:var(--brand-d);border-color:var(--brand-dd);color:var(--ink)}
.msg .body b{color:var(--ink)}
.chips{display:flex;flex-wrap:wrap;gap:8px;padding:0 20px 12px}
.chips .chip{font-size:12.5px;padding:7px 13px;border-radius:999px;border:1px solid var(--line);background:var(--card2);color:var(--ink2);cursor:pointer;transition:.15s}
.chips .chip:hover{border-color:var(--brand-dd);color:var(--brand)}
.inrow{display:flex;gap:10px;padding:14px 16px;border-top:1px solid var(--line);background:var(--card)}
.inrow input{flex:1;min-width:0;height:46px;padding:0 14px;border-radius:10px;border:1px solid var(--line);background:var(--card2);font-size:14.5px;color:var(--ink)}
.inrow input:focus{outline:none;border-color:var(--brand-dd);background:#fff;box-shadow:0 0 0 3px var(--brand-d)}
.inrow button{flex:none;height:46px;padding:0 22px;border-radius:10px;border:0;background:linear-gradient(100deg,#E08A2A,#C2571C);color:#fff;font-size:14.5px;font-weight:600;cursor:pointer}
.inrow button:disabled{opacity:.6;cursor:default}
@media(max-width:520px){.chat-log{height:300px}}

/* ── 素材封面 ── */
.mt-cover{width:100%;aspect-ratio:16/10;border-radius:12px;overflow:hidden;border:1px solid var(--line2);margin-bottom:12px;background:var(--card2)}
.mt-cover img,.mt-cover svg{width:100%;height:100%;display:block;object-fit:cover}

/* ── 页脚 ── */
footer{border-top:1px solid var(--line);background:rgba(255,255,255,.6);margin-top:30px}
.foot-in{padding:40px 0;display:flex;flex-wrap:wrap;gap:20px;justify-content:space-between;align-items:center}
.foot-in .brand-t b{color:var(--ink)}
.foot-meta{font-size:12.5px;color:var(--dim2)}
.foot-links{display:flex;gap:18px;flex-wrap:wrap;font-size:13px}
.foot-links a{color:var(--dim)}
.foot-links a:hover{color:var(--brand)}

@media(max-width:760px){
  section{padding:48px 0}
  .grid.c3,.grid.c4{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:520px){
  .grid.c2,.grid.c3,.grid.c4{grid-template-columns:1fr}
}

/* ── 智脑三张可点的卡 ── */
.askcard{cursor:pointer;transition:transform .2s,box-shadow .25s,border-color .2s}
.askcard:hover{transform:translateY(-3px);box-shadow:0 12px 28px rgba(150,100,50,.14)}
.askcard .asktip{display:block;margin-top:10px;font-size:11.5px;font-weight:800;
  color:var(--brand);opacity:.62;transition:opacity .2s}
.askcard:hover .asktip{opacity:1}