/* =========================================================
   齐大校园智学助手 · 智能体展示页
   ========================================================= */

:root{
  --ink:#0d1a30;
  --ink-2:#22334f;
  --muted:#5c6c86;
  --muted-2:#8595ad;
  --line:#e4eaf3;
  --bg:#f5f7fb;
  --bg-alt:#edf1f8;
  --card:#ffffff;
  --brand:#2f6bff;
  --teal:#14b8a6;
  --violet:#7c5cff;
  --amber:#f59e0b;
  --grad:linear-gradient(120deg,#2f6bff,#14b8a6);
  --radius:18px;
  --shadow-sm:0 1px 2px rgba(13,26,48,.05),0 10px 26px -14px rgba(13,26,48,.14);
  --shadow-md:0 22px 46px -24px rgba(13,26,48,.28);
  --font:"MiSans","HarmonyOS Sans SC","PingFang SC","Microsoft YaHei UI","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --serif:Georgia,"Times New Roman",serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px}
body{
  margin:0;
  font-family:var(--font);
  color:var(--ink);
  background:var(--bg);
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
img,svg{display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none;margin:0;padding:0}
h1,h2,h3,h4{margin:0;line-height:1.32;font-weight:800}
p{margin:0}
::selection{background:rgba(47,107,255,.2)}

.container{width:min(1140px,92%);margin:0 auto}

.skip-link{
  position:absolute;left:-9999px;top:0;z-index:99;
  background:#fff;color:var(--ink);padding:10px 16px;border-radius:0 0 10px 0;
}
.skip-link:focus{left:0}

/* ================= 导航 ================= */
.nav{
  position:fixed;inset:0 0 auto 0;z-index:60;
  transition:background .3s ease,box-shadow .3s ease,backdrop-filter .3s ease;
  background:transparent;
}
.nav.scrolled{
  background:rgba(8,17,32,.88);
  backdrop-filter:blur(14px);
  box-shadow:0 12px 34px -20px rgba(8,17,32,.75);
}
.nav-inner{display:flex;align-items:center;gap:22px;height:68px}
.brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800;white-space:nowrap}
.brand-mark{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;
  background:var(--grad);font-size:17px;flex:none;
}
.brand-name{font-size:15.5px;letter-spacing:.02em}
.nav-menu-wrap{margin-left:auto}
.nav-menu{display:flex;gap:2px}
.nav-menu a{
  color:rgba(255,255,255,.78);font-size:14.5px;padding:8px 12px;border-radius:10px;
  transition:background .2s ease,color .2s ease;
}
.nav-menu a:hover{color:#fff;background:rgba(255,255,255,.08)}
.nav-menu a.active{color:#fff;background:rgba(255,255,255,.13)}
.nav-cta{margin-left:6px}

.nav-toggle{
  display:none;width:40px;height:40px;padding:0;border-radius:11px;cursor:pointer;
  border:1px solid rgba(255,255,255,.22);background:rgba(255,255,255,.06);
  place-items:center;gap:0;
}
.nav-toggle span{
  display:block;width:18px;height:2px;border-radius:2px;background:#fff;
  transition:transform .25s ease,opacity .25s ease;margin:2.5px auto;
}
.nav.open .nav-toggle span:nth-child(1){transform:translateY(4.5px) rotate(45deg)}
.nav.open .nav-toggle span:nth-child(2){opacity:0}
.nav.open .nav-toggle span:nth-child(3){transform:translateY(-4.5px) rotate(-45deg)}

/* ================= 按钮 ================= */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font);font-weight:700;border-radius:12px;border:1px solid transparent;
  cursor:pointer;transition:transform .18s ease,box-shadow .18s ease,background .2s ease,color .2s ease;
  white-space:nowrap;
}
.btn-sm{font-size:14px;padding:9px 16px}
.btn-lg{font-size:15.5px;padding:14px 26px}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 14px 30px -14px rgba(47,107,255,.7)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 20px 38px -16px rgba(47,107,255,.8)}
.btn-ghost{background:rgba(255,255,255,.06);border-color:rgba(255,255,255,.26);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.14);transform:translateY(-2px)}
.btn-light{background:#fff;color:#0d1a30;box-shadow:0 18px 38px -18px rgba(0,0,0,.55)}
.btn-light:hover{transform:translateY(-2px)}
.btn:focus-visible{outline:2px solid #7fb0ff;outline-offset:2px}

/* ================= Hero ================= */
.hero{
  position:relative;overflow:hidden;color:#fff;
  padding:158px 0 100px;
  background:
    radial-gradient(1200px 620px at 78% -12%,#16375f 0%,transparent 62%),
    linear-gradient(165deg,#081226 0%,#0d2140 52%,#0a2c3f 100%);
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:radial-gradient(900px 560px at 68% 6%,#000 26%,transparent 76%);
  mask-image:radial-gradient(900px 560px at 68% 6%,#000 26%,transparent 76%);
}
.orb{position:absolute;border-radius:50%;filter:blur(72px);opacity:.55;pointer-events:none}
.orb-a{width:430px;height:430px;background:rgba(47,107,255,.5);top:-150px;left:-130px;animation:float1 15s ease-in-out infinite}
.orb-b{width:390px;height:390px;background:rgba(20,184,166,.4);bottom:-170px;right:-90px;animation:float2 18s ease-in-out infinite}
.orb-c{width:260px;height:260px;background:rgba(245,158,11,.2);top:34%;right:22%;animation:float1 22s ease-in-out infinite reverse}
@keyframes float1{50%{transform:translate3d(32px,-26px,0)}}
@keyframes float2{50%{transform:translate3d(-38px,26px,0)}}

.hero-grid{
  position:relative;z-index:2;
  display:grid;grid-template-columns:1.08fr .92fr;gap:54px;align-items:center;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-size:12.5px;font-weight:700;letter-spacing:.15em;text-transform:uppercase;
  color:#5d7fab;
}
.eyebrow::before{
  content:"";width:26px;height:2px;border-radius:2px;background:var(--grad);flex:none;
}
.hero .eyebrow{color:#8fc6ff}
.hero-title{
  font-size:clamp(34px,4.6vw,56px);
  margin-top:16px;letter-spacing:.01em;
}
.grad-text{
  background:linear-gradient(120deg,#6ea8ff,#3fe0c5);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.hero-lead{
  margin-top:18px;max-width:560px;
  color:rgba(255,255,255,.82);font-size:16.5px;
}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.badge-pill{
  font-size:13px;padding:6px 13px;border-radius:999px;color:rgba(255,255,255,.86);
  border:1px solid rgba(255,255,255,.18);background:rgba(255,255,255,.06);
  backdrop-filter:blur(6px);
}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:30px}
.hero-stats{
  display:grid;grid-template-columns:repeat(4,auto);gap:34px;
  margin-top:46px;padding-top:26px;border-top:1px solid rgba(255,255,255,.12);
}
.stat{display:flex;flex-direction:column}
.stat-num{font-size:24px;font-weight:800;letter-spacing:.02em}
.stat-label{margin-top:4px;font-size:12.5px;color:rgba(255,255,255,.62)}

/* 主视觉聊天卡 */
.chat-card--dark{
  background:rgba(12,23,43,.74);
  border:1px solid rgba(255,255,255,.12);
  border-radius:22px;overflow:hidden;
  backdrop-filter:blur(14px);
  box-shadow:0 34px 74px -32px rgba(0,0,0,.7);
  animation:bob 10s ease-in-out infinite;
}
@keyframes bob{50%{transform:translateY(-10px)}}
.chat-head{
  display:flex;align-items:center;gap:10px;
  padding:14px 18px;border-bottom:1px solid rgba(255,255,255,.09);
  background:rgba(255,255,255,.03);
}
.dots{display:flex;gap:6px;flex:none}
.dots i{width:10px;height:10px;border-radius:50%;background:#ff5f57}
.dots i:nth-child(2){background:#febc2e}
.dots i:nth-child(3){background:#28c840}
.chat-title{font-size:13.5px;font-weight:600;color:rgba(255,255,255,.86);margin-left:4px}
.live{
  display:inline-flex;align-items:center;gap:6px;margin-left:auto;
  font-size:12px;color:#7ef0c9;
}
.live i{
  width:7px;height:7px;border-radius:50%;background:#34d399;
  animation:pulse 2.2s ease-out infinite;
}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(52,211,153,.55)}70%{box-shadow:0 0 0 9px rgba(52,211,153,0)}100%{box-shadow:0 0 0 0 rgba(52,211,153,0)}}
.chat-body{padding:20px;display:flex;flex-direction:column;gap:14px}
.bubble{
  max-width:88%;padding:11px 15px;border-radius:15px;
  font-size:13.5px;line-height:1.7;
}
.bubble.user{
  align-self:flex-end;color:#fff;
  background:linear-gradient(135deg,#2f6bff,#2f8fff);
  border-bottom-right-radius:6px;
}
.bubble.bot{
  align-self:flex-start;
  background:rgba(255,255,255,.08);
  border:1px solid rgba(255,255,255,.1);
  color:rgba(255,255,255,.92);
  border-bottom-left-radius:6px;
}
.chat-foot{padding:14px 18px 18px;border-top:1px solid rgba(255,255,255,.09)}
.input-mock{
  display:flex;align-items:center;gap:10px;
  padding:10px 14px;border-radius:12px;font-size:13px;
  color:rgba(255,255,255,.45);
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.12);
}
.input-mock .send{
  margin-left:auto;width:28px;height:28px;border-radius:9px;flex:none;
  display:grid;place-items:center;color:#fff;font-size:13px;
  background:var(--grad);
}

/* ================= 通用区块 ================= */
.section{padding:96px 0}
.section-alt{background:var(--bg-alt)}
.section-head{max-width:760px;margin-bottom:46px}
.section-title{font-size:clamp(26px,3vw,36px);margin-top:14px}
.section-sub{margin-top:14px;color:var(--muted);font-size:16px}

/* ================= 核心能力 ================= */
.feature-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.feature-card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;box-shadow:var(--shadow-sm);
  transition:transform .25s ease,box-shadow .25s ease,border-color .25s ease;
}
.feature-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md);border-color:#cfdcf2}
.icon-tile{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;margin-bottom:18px}
.tile-blue{background:rgba(47,107,255,.12);color:#2f6bff}
.tile-teal{background:rgba(20,184,166,.14);color:#0d9488}
.tile-violet{background:rgba(124,92,255,.13);color:#6d4df0}
.tile-amber{background:rgba(245,158,11,.16);color:#d97706}
.feature-card h3{font-size:18.5px}
.feature-desc{margin-top:10px;color:var(--muted);font-size:14.5px}
.feature-list{margin-top:16px;display:grid;gap:8px}
.feature-list li{position:relative;padding-left:20px;font-size:14px;color:var(--ink-2)}
.feature-list li::before{
  content:"";position:absolute;left:2px;top:.6em;width:6px;height:6px;border-radius:2px;
  background:var(--grad);transform:rotate(45deg);
}

/* ================= 解答方法 ================= */
.steps-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.step-card{
  background:#fff;border:1px solid var(--line);border-radius:16px;padding:22px 20px;
  transition:transform .25s ease,box-shadow .25s ease;
}
.step-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.step-num{
  font-family:var(--serif);font-style:italic;font-weight:700;font-size:26px;
  color:#b9c9e4;
}
.step-card h3{font-size:15.5px;margin-top:10px}
.step-card p{margin-top:8px;font-size:13.5px;color:var(--muted)}
.note-strip{
  margin-top:26px;padding:16px 20px;border-radius:14px;
  background:#fff;border:1px dashed #c9d6ea;
  font-size:14px;color:var(--ink-2);
}
.note-strip strong{color:var(--brand)}

/* ================= 工作流程 ================= */
.flow{display:flex;flex-direction:column;align-items:center}
.flow-node{
  background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:13px 28px;font-weight:700;font-size:15px;
  box-shadow:var(--shadow-sm);
}
.flow-node.detect{background:linear-gradient(120deg,#12233f,#0f3350);color:#fff;border-color:transparent}
.flow-arrow-v{
  width:2px;height:26px;position:relative;
  background:linear-gradient(#b9cbe6,#dfe8f5);
}
.flow-arrow-v::after{
  content:"";position:absolute;left:50%;bottom:-1px;transform:translateX(-50%);
  border:5px solid transparent;border-top-color:#b9cbe6;
}
.flow-branches{
  width:100%;margin-top:24px;
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;
}
.flow-card{
  background:#fff;border:1px solid var(--line);border-radius:18px;
  border-top:4px solid transparent;padding:24px;
  box-shadow:var(--shadow-sm);
  transition:transform .25s ease,box-shadow .25s ease;
}
.flow-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.flow-card.campus{border-top-color:var(--brand)}
.flow-card.weather{border-top-color:var(--teal)}
.flow-card.material{border-top-color:var(--violet)}
.flow-tag{
  display:inline-block;font-size:12px;font-weight:700;
  padding:4px 11px;border-radius:999px;
}
.tag-blue{background:#eef4ff;color:#2456d6}
.tag-teal{background:#e8faf6;color:#0d9488}
.tag-violet{background:#f1edff;color:#6d4df0}
.flow-card h3{margin-top:12px;font-size:16.5px}
.flow-path{margin-top:14px;display:grid;gap:9px}
.flow-path li{
  display:flex;gap:8px;align-items:flex-start;
  font-size:13.5px;color:var(--muted);
}
.flow-path li::before{content:"→";color:#9fb4d6;flex:none}
.flow-out{
  margin-top:14px;padding:12px 14px;border-radius:12px;
  background:#f6f9ff;border:1px solid #e2ecff;
  font-size:13.5px;color:var(--ink-2);
}
.reliability{
  margin-top:34px;
  display:grid;grid-template-columns:repeat(3,1fr);gap:16px;
}
.reliability li{
  display:flex;gap:10px;align-items:flex-start;
  background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:16px 18px;font-size:13.5px;color:var(--ink-2);
}
.tag-i{
  flex:none;width:22px;height:22px;border-radius:7px;display:grid;place-items:center;
  background:rgba(245,158,11,.16);color:#d97706;font-size:12px;font-weight:800;
  margin-top:2px;
}

/* ================= 在线体验 ================= */
.demo-grid{display:grid;grid-template-columns:1.52fr 1fr;gap:26px;align-items:start}
.chat-window{
  display:flex;flex-direction:column;overflow:hidden;
  background:#fff;border:1px solid var(--line);border-radius:20px;
  box-shadow:var(--shadow-md);
}
.cw-head{
  display:flex;align-items:center;gap:10px;
  padding:14px 18px;border-bottom:1px solid var(--line);background:#fbfcfe;
}
.cw-title{font-weight:700;font-size:14.5px}
.cw-tag{
  margin-left:auto;font-size:12px;font-weight:600;color:#b45309;
  background:#fef3c7;border-radius:999px;padding:4px 11px;
}
.chat-log{
  flex:1;padding:22px 20px;display:flex;flex-direction:column;gap:16px;
  min-height:360px;max-height:480px;overflow-y:auto;
  scroll-behavior:smooth;
}
.msg{display:flex;gap:10px;align-items:flex-start;animation:msgIn .35s ease both}
.msg.user{flex-direction:row-reverse}
@keyframes msgIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.avatar{
  flex:none;width:34px;height:34px;border-radius:11px;
  display:grid;place-items:center;font-size:16px;
  background:linear-gradient(135deg,rgba(47,107,255,.14),rgba(20,184,166,.18));
}
.msg.user .avatar{background:#0d1a30;color:#fff}
.bubble-l{
  max-width:80%;padding:12px 16px;font-size:14px;color:var(--ink-2);
  background:#f4f7fc;border:1px solid #e6edf7;
  border-radius:14px;border-top-left-radius:5px;
}
.msg.user .bubble-l{
  background:linear-gradient(135deg,#2f6bff,#3187ff);color:#fff;border:none;
  border-radius:14px;border-top-right-radius:5px;
}
.bubble-l h4{font-size:14.5px;margin-bottom:8px;color:var(--ink)}
.bubble-l p + p{margin-top:8px}
.bubble-l ul{margin:8px 0 0;display:grid;gap:6px}
.bubble-l ul li{position:relative;padding-left:15px;font-size:13.5px}
.bubble-l ul li::before{
  content:"";position:absolute;left:1px;top:.62em;width:5px;height:5px;border-radius:2px;
  background:#9fb8de;transform:rotate(45deg);
}
.bubble-l .strong-line{color:var(--ink)}
.typing{display:inline-flex;gap:5px;padding:4px 2px}
.typing i{
  width:7px;height:7px;border-radius:50%;background:#b9c9e4;
  animation:blink 1.2s infinite both;
}
.typing i:nth-child(2){animation-delay:.15s}
.typing i:nth-child(3){animation-delay:.3s}
@keyframes blink{0%,80%,100%{opacity:.3;transform:translateY(0)}40%{opacity:1;transform:translateY(-3px)}}

/* 天气卡 */
.wx-card{
  min-width:min(400px,100%);
  border-radius:14px;border:1px solid #d9e8ff;padding:16px;
  background:linear-gradient(160deg,#f2f8ff,#eefcf9);
}
.wx-head{display:flex;align-items:center;gap:12px}
.wx-emoji{font-size:26px}
.wx-place{font-weight:800;color:var(--ink);font-size:14.5px}
.wx-sub{display:block;font-size:12px;color:var(--muted-2);font-weight:500}
.wx-temp{font-size:22px;font-weight:800;color:var(--ink);margin-top:10px}
.wx-list{margin-top:8px;display:grid;gap:4px}
.wx-list li{font-size:13px;color:var(--ink-2);padding-left:0}
.wx-list li::before{content:none}
.wx-tip{
  margin-top:10px;padding:10px 12px;border-radius:10px;
  background:#fff;border:1px dashed #c7dcff;
  font-size:13px;color:#2b4a7d;
}
.demo-note{
  display:inline-block;margin-top:10px;padding:3px 9px;border-radius:999px;
  font-size:11.5px;font-weight:600;color:#b45309;background:#fef3c7;
}

/* 报告 / 导师点评 */
.report h4{font-size:14.5px;margin-bottom:8px}
.mentor{
  margin-top:12px;padding:12px 14px;border-radius:0 12px 12px 0;
  border-left:3px solid var(--teal);background:#f0fdfa;
}
.mentor strong{display:block;color:#0f766e;margin-bottom:6px;font-size:13.5px}
.mentor ul{margin:0}
.mentor ul li::before{background:#2dd4bf}

.chips{
  display:flex;flex-wrap:wrap;gap:10px;
  padding:14px 18px;border-top:1px solid var(--line);background:#fbfcfe;
}
.chip{
  font-family:var(--font);font-size:13px;color:#2b4a7d;
  padding:8px 14px;border-radius:999px;cursor:pointer;
  background:#fff;border:1px solid #d7e2f5;
  transition:transform .18s ease,border-color .18s ease,color .18s ease,background .18s ease;
}
.chip:hover:not(:disabled){border-color:var(--brand);color:var(--brand);background:#f4f8ff;transform:translateY(-1px)}
.chip:disabled{opacity:.5;cursor:default}
.chat-inputrow{padding:0 18px 18px;background:#fbfcfe}
.cir{
  display:flex;align-items:center;gap:10px;
  padding:11px 14px;border-radius:12px;font-size:13.5px;color:var(--muted-2);
  background:#fff;border:1px solid #d7e2f5;
}
.cir .send{
  margin-left:auto;width:28px;height:28px;border-radius:9px;flex:none;
  display:grid;place-items:center;color:#fff;font-size:13px;background:var(--grad);
}

.demo-side .side-card{
  background:#fff;border:1px solid var(--line);border-radius:20px;
  padding:26px;box-shadow:var(--shadow-sm);
}
.side-card h3{font-size:17px}
.side-list{margin-top:16px;display:grid;gap:11px}
.side-list li{
  display:flex;gap:10px;align-items:flex-start;
  font-size:13.5px;color:var(--muted);
}
.dot-i{
  flex:none;width:8px;height:8px;border-radius:50%;margin-top:.55em;
  background:var(--grad);
}
.side-actions{margin-top:22px;display:grid;gap:10px}

/* ================= 使用场景 ================= */
.scenario-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.scenario-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px;box-shadow:var(--shadow-sm);
  transition:transform .25s ease,box-shadow .25s ease;
}
.scenario-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-md)}
.scenario-emoji{
  display:grid;place-items:center;width:44px;height:44px;border-radius:13px;
  background:#f2f6fd;font-size:21px;margin-bottom:16px;
}
.scenario-card h3{font-size:17px}
.scenario-card p{margin-top:9px;font-size:14px;color:var(--muted)}

/* ================= FAQ ================= */
.faq-list{display:grid;gap:14px;max-width:880px}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:16px;
  overflow:hidden;box-shadow:var(--shadow-sm);
}
.faq-item summary{
  list-style:none;cursor:pointer;display:flex;align-items:center;gap:14px;
  padding:20px 24px;font-weight:700;font-size:15.5px;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:"+";margin-left:auto;font-size:22px;font-weight:400;color:#8fa6c9;
  transition:transform .25s ease;line-height:1;
}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-body{padding:0 24px 22px;font-size:14.5px;color:var(--muted)}

/* ================= CTA ================= */
.cta-band{
  padding:88px 0;text-align:center;color:#fff;
  background:
    radial-gradient(800px 400px at 18% 0%,rgba(47,107,255,.38),transparent 62%),
    radial-gradient(700px 420px at 86% 100%,rgba(20,184,166,.32),transparent 62%),
    #0a1730;
}
.cta-band h2{font-size:clamp(24px,3vw,34px)}
.cta-band p{margin-top:14px;color:rgba(255,255,255,.74)}
.cta-band .btn{margin-top:30px}

/* ================= 页脚 ================= */
.footer{background:#081220;color:rgba(255,255,255,.62);padding:54px 0 30px;font-size:14px}
.footer-top{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap}
.footer-brand{display:flex;align-items:center;gap:10px;color:#fff;font-weight:800}
.footer-links{display:flex;gap:22px;flex-wrap:wrap}
.footer-links a{transition:color .2s ease}
.footer-links a:hover{color:#fff}
.footer-bottom{
  margin-top:34px;padding-top:22px;border-top:1px solid rgba(255,255,255,.1);
  display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;
  font-size:12.5px;color:rgba(255,255,255,.42);
}

/* ================= 入场动画 ================= */
.reveal{
  opacity:0;transform:translateY(22px);
  transition:opacity .7s cubic-bezier(.2,.7,.3,1),transform .7s cubic-bezier(.2,.7,.3,1);
}
.reveal.in{opacity:1;transform:none}

/* 截图 / 预览模式：跳过入场动画与平滑滚动 */
html.shot{scroll-behavior:auto}
html.shot .reveal{opacity:1;transform:none;transition:none}
html.shot .msg{animation:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .orb,.chat-card--dark,.live i{animation:none}
  .msg{animation:none}
}

/* ================= 响应式 ================= */
@media (max-width:1100px){
  .steps-grid{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:1024px){
  .hero{padding:140px 0 84px}
  .hero-grid{grid-template-columns:1fr;gap:46px}
  .feature-grid{grid-template-columns:1fr 1fr}
  .flow-branches{grid-template-columns:1fr 1fr}
  .demo-grid{grid-template-columns:1fr}
  .reliability{grid-template-columns:1fr}
}
@media (max-width:860px){
  .nav-toggle{display:grid}
  .nav-menu-wrap{margin-left:auto}
  .nav-menu{display:none}
  .nav.open .nav-menu{
    display:flex;flex-direction:column;gap:4px;
    position:absolute;left:0;right:0;top:68px;
    padding:12px 4% 22px;
    background:rgba(8,17,32,.98);
    box-shadow:0 34px 56px -22px rgba(0,0,0,.65);
    border-bottom:1px solid rgba(255,255,255,.08);
  }
  .nav-menu a{display:block;padding:12px 14px;font-size:15px}
  .hero-stats{grid-template-columns:repeat(2,1fr);gap:24px}
  .scenario-grid{grid-template-columns:1fr}
  .footer-top{flex-direction:column;gap:24px}
}
@media (max-width:640px){
  .section{padding:72px 0}
  .nav-cta{display:none}
  .hero-title{font-size:clamp(30px,8vw,40px)}
  .feature-grid{grid-template-columns:1fr}
  .steps-grid{grid-template-columns:1fr}
  .flow-branches{grid-template-columns:1fr}
  .bubble-l{max-width:88%}
  .chat-log{max-height:420px}
  .wx-card{min-width:0}
}

/* =========================================================
   校史知识库板块
   ========================================================= */

/* ---- 时间轴 ---- */
.timeline{
  position:relative;max-width:920px;margin:0 auto;
}
.timeline::before{
  content:"";position:absolute;left:99px;top:10px;bottom:14px;width:2px;
  background:linear-gradient(#c9d8ef,#e4ebf6);border-radius:2px;
}
.tl-item{
  position:relative;display:grid;grid-template-columns:84px 1fr;gap:32px;
  padding-bottom:22px;
}
.tl-item::before{
  content:"";position:absolute;left:94px;top:16px;
  width:12px;height:12px;border-radius:50%;
  background:#fff;border:3px solid var(--brand);
  box-shadow:0 0 0 4px rgba(47,107,255,.14);
  z-index:1;
}
.tl-year{
  font-family:var(--serif);font-style:italic;font-weight:700;
  font-size:15px;color:#3b5a8c;text-align:right;padding-top:13px;
  white-space:nowrap;letter-spacing:.01em;
}
.tl-card{
  background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:18px 22px;box-shadow:var(--shadow-sm);
  transition:transform .25s ease,box-shadow .25s ease;
}
.tl-card:hover{transform:translateX(4px);box-shadow:var(--shadow-md)}
.tl-card h3{font-size:15.5px}
.tl-card p{margin-top:7px;font-size:13.8px;color:var(--muted)}
.tl-note{
  margin:10px auto 0;max-width:920px;
  font-size:13px;color:var(--muted-2);text-align:center;
}

/* ---- 齐大精神 ---- */
.culture-grid{
  display:grid;grid-template-columns:1.05fr 1.95fr;gap:20px;
  margin-top:56px;
}
.culture-main{
  border-radius:var(--radius);padding:28px;color:#fff;
  background:
    radial-gradient(420px 220px at 90% -10%,rgba(20,184,166,.35),transparent 65%),
    linear-gradient(150deg,#10233f,#0e3350);
}
.culture-main h3{font-size:17px;color:rgba(255,255,255,.85)}
.motto{
  margin-top:14px;font-size:clamp(19px,2vw,23px);font-weight:800;letter-spacing:.1em;
  background:linear-gradient(120deg,#7db4ff,#3fe0c5);
  -webkit-background-clip:text;background-clip:text;color:transparent;
}
.culture-main p:last-child{margin-top:12px;font-size:13.8px;color:rgba(255,255,255,.76)}
.culture-mini{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.culture-item,.fact{
  background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:18px 20px;box-shadow:var(--shadow-sm);
}
.mini-label{
  display:block;font-size:12px;font-weight:800;letter-spacing:.12em;
  color:var(--muted-2);
}
.mini-value{
  display:block;margin-top:7px;font-size:15.5px;font-weight:800;color:var(--ink-2);
}
.facts-row{
  margin-top:20px;display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
}
.fact{border-style:dashed;border-color:#c9d6ea;box-shadow:none;background:rgba(255,255,255,.7)}
.fact .mini-value{font-size:14.5px}

/* ---- 场馆与文化名片 ---- */
.museum-grid{margin-top:40px;display:grid;grid-template-columns:1fr 1fr;gap:18px}
.museum-card{
  background:#fff;border:1px solid var(--line);border-radius:18px;
  padding:24px;box-shadow:var(--shadow-sm);
  transition:transform .25s ease,box-shadow .25s ease;
}
.museum-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.museum-card.wide{grid-column:1/-1}
.museum-emoji{font-size:22px;line-height:1}
.museum-card h3{margin-top:10px;font-size:16.5px}
.museum-card p{margin-top:8px;font-size:13.8px;color:var(--muted)}
.museum-list{margin-top:12px;display:grid;gap:7px}
.museum-list li{position:relative;padding-left:16px;font-size:13.5px;color:var(--ink-2)}
.museum-list li::before{
  content:"";position:absolute;left:1px;top:.62em;width:5px;height:5px;border-radius:2px;
  background:var(--grad);transform:rotate(45deg);
}

/* ---- 知识库规范 ---- */
.kb-rules{
  margin-top:34px;display:grid;grid-template-columns:repeat(4,1fr);gap:16px;
}
.kb-rules li{
  background:#fff;border:1px solid var(--line);border-radius:14px;
  padding:14px 16px;font-size:13px;color:var(--ink-2);line-height:1.6;
}

/* ---- 条目示例表 ---- */
.kb-table-wrap{
  margin-top:26px;background:#fff;border:1px solid var(--line);
  border-radius:18px;padding:22px 22px 18px;box-shadow:var(--shadow-sm);
  overflow-x:auto;
}
.kb-table{width:100%;border-collapse:collapse;min-width:640px}
.kb-table caption{
  text-align:left;font-size:13.5px;font-weight:800;color:var(--ink-2);
  padding-bottom:14px;
}
.kb-table th{
  text-align:left;font-size:12.5px;font-weight:800;letter-spacing:.08em;
  color:var(--muted-2);padding:10px 14px;border-bottom:1px solid var(--line);
  white-space:nowrap;
}
.kb-table td{
  font-size:13.5px;color:var(--ink-2);padding:12px 14px;
  border-bottom:1px solid #eef2f8;vertical-align:top;
}
.kb-table tr:last-child td{border-bottom:none}
.kb-table td:first-child{
  font-family:ui-monospace,Consolas,"Courier New",monospace;
  font-weight:700;color:var(--brand);
}
.kb-table td:nth-child(3),.kb-table td:nth-child(4){color:var(--muted);font-size:13px;white-space:nowrap}
.kb-table-note{margin-top:12px;font-size:12.5px;color:var(--muted-2)}

/* ---- 对话中的来源标注 ---- */
.kb-src{
  margin-top:10px;padding-top:8px;border-top:1px dashed #dbe6f7;
  font-size:12px;color:var(--muted-2);line-height:1.6;
}

/* ---- 校史板块响应式 ---- */
@media (max-width:1024px){
  .culture-grid{grid-template-columns:1fr}
  .facts-row{grid-template-columns:1fr 1fr}
  .kb-rules{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  .timeline::before{display:none}
  .tl-item{grid-template-columns:1fr;gap:8px;padding-bottom:18px}
  .tl-item::before{display:none}
  .tl-year{text-align:left;padding-top:0;color:var(--brand);font-size:14px}
  .culture-mini{grid-template-columns:1fr}
  .facts-row{grid-template-columns:1fr}
  .museum-grid{grid-template-columns:1fr}
  .kb-rules{grid-template-columns:1fr}
}

/* =========================================================
   独立运行版：对话输入、知识库命中、来源标注
   ========================================================= */
.cw-reset{
  margin-left:10px;padding:4px 11px;border-radius:999px;cursor:pointer;
  font-family:var(--font);font-size:12px;color:#5d729b;
  background:#fff;border:1px solid #d7e2f5;
  transition:border-color .18s,color .18s;
}
.cw-reset:hover{border-color:var(--brand);color:var(--brand)}

.chat-inputrow{
  display:flex;align-items:center;gap:10px;
  padding:14px 18px 18px;background:#fbfcfe;
}
.chat-input{
  flex:1;min-width:0;outline:none;
  font-family:var(--font);font-size:14px;color:var(--ink);
  padding:12px 16px;border-radius:12px;
  border:1px solid #d7e2f5;background:#fff;
  transition:border-color .2s,box-shadow .2s;
}
.chat-input:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(47,107,255,.12)}
.chat-input::placeholder{color:#9aabc4}
.chat-input:disabled{background:#f4f7fc;color:var(--muted-2)}
.chat-send{
  flex:none;width:44px;height:44px;border-radius:12px;border:none;cursor:pointer;
  background:var(--grad);color:#fff;font-size:15px;
  display:grid;place-items:center;font-family:var(--font);
  transition:transform .18s,box-shadow .18s;
}
.chat-send:hover{transform:translateY(-1px);box-shadow:0 12px 24px -12px rgba(47,107,255,.7)}
.chat-send:disabled{opacity:.55;cursor:default;transform:none;box-shadow:none}

.side-link{display:block;font-size:12.5px;color:var(--muted-2);text-align:center;line-height:1.6}
.side-link:hover{color:var(--brand)}

.engine-status{
  display:flex;align-items:center;gap:8px;
  margin-top:16px;padding:10px 12px;border-radius:10px;
  font-size:12.5px;color:var(--muted);
  background:#f6f9fe;border:1px dashed #d7e2f5;
}
.engine-status::before{
  content:"";flex:none;width:8px;height:8px;border-radius:50%;background:#cbd5e1;
}
.engine-status.ready{color:#0f766e;background:#f0fdfa;border-color:#b7ead9}
.engine-status.ready::before{background:#22c55e;box-shadow:0 0 0 3px rgba(34,197,94,.18)}
.engine-status.off{color:#2b4a7d;background:#f4f8ff;border-color:#d7e2f5}
.engine-status.off::before{background:var(--brand);box-shadow:0 0 0 3px rgba(47,107,255,.14)}

.cta-actions{display:flex;justify-content:center;gap:14px;flex-wrap:wrap;margin-top:30px}
.cta-actions .btn{margin-top:0}

/* 知识库命中卡片 */
.kb-hit{
  margin-top:10px;padding:14px 16px;border-radius:12px;
  background:#f8fbff;border:1px solid #e2ecff;
}
.kb-hit-h{display:flex;gap:8px;align-items:baseline;font-weight:800;font-size:14px;color:var(--ink)}
.kb-id{
  font-family:ui-monospace,Consolas,"Courier New",monospace;
  font-size:12.5px;color:var(--brand);background:#eaf2ff;border-radius:6px;padding:2px 7px;
}
.kb-hit p{margin-top:8px;font-size:13.5px;color:var(--ink-2)}
.kb-meta{margin-top:8px;font-size:12px;color:var(--muted-2)}
.verify{background:#fef3c7;color:#b45309;border-radius:6px;padding:1px 6px;font-size:12.5px}
.src-note{
  display:inline-block;margin-top:10px;padding:3px 9px;border-radius:999px;
  font-size:11.5px;color:#5d729b;background:#eef3fb;
}

@media (max-width:640px){
  .cw-tag{display:none}
  .chat-inputrow{padding:12px 14px 14px}
}