/* 千问 · 知识星图 —— 星图体裁(群青蓝 + 星青渐变 + 琥珀亮星) */
:root{
  --paper:#F6F8FD;      /* 浅蓝白底 */
  --paper2:#EEF2FB;     /* 分区浅蓝灰 */
  --paper3:#FFFFFF;
  --ink:#1F2437;        /* 深靛灰文字 */
  --ink-soft:#3A4158;
  --muted:#8A90A8;
  --brand:#3346D6;      /* 群青蓝主色 */
  --brand2:#0EA5E9;     /* 星青 */
  --brand-deep:#2636B0; /* 深群青 */
  --amber:#F59E0B;      /* 琥珀亮星 */
  --brand-soft:rgba(51,70,214,.07);
  --brand-softer:rgba(51,70,214,.14);
  --line:#E2E7F4;
  --line2:#C7CFE6;
  --deep:#1F2437;       /* 深靛灰页脚 */
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --wrap:1120px;
  --shadow:0 18px 40px -26px rgba(31,36,55,.30);
  --r:16px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.8;font-size:16px;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}

/* ============ hero 内搜索栏 ============ */
.hero-search{margin-top:26px;width:100%}
.hero-search form{display:flex;align-items:center;gap:10px;background:var(--paper3);border:1px solid var(--line2);border-radius:14px;padding:6px 6px 6px 18px;box-shadow:var(--shadow)}
.hero-search form:focus-within{border-color:var(--brand);box-shadow:0 0 0 4px var(--brand-soft)}
.hero-search-ico{color:var(--brand);display:flex;flex:none}
.hero-search-ico svg{width:20px;height:20px}
.hero-search input{flex:1;border:none;outline:none;background:transparent;color:var(--ink);font-size:15px;min-width:0;padding:8px 0}
.hero-search input::placeholder{color:var(--muted)}
.hero-search button{flex:none;background:linear-gradient(120deg,var(--brand),var(--brand2));color:#fff;font-weight:700;padding:10px 20px;border-radius:10px;border:none;cursor:pointer;font-size:14px}
.hero-search button:hover{background:var(--brand-deep)}

/* ============ 站内搜索结果 ============ */
.search-results{list-style:none;text-align:left;margin-top:26px;display:flex;flex-direction:column;gap:10px}
.search-results li{background:var(--paper3);border:1px solid var(--line);border-radius:12px}
.search-results li a{display:block;padding:14px 18px;color:var(--ink-soft);font-weight:600}
.search-results li a:hover{color:var(--brand)}

/* ============ 顶部吸顶导航(下划线 + 圆点指示) ============ */
.topbar{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.9);backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:11px;font-weight:800;font-size:20px;letter-spacing:.5px}
.brand-logo{width:34px;height:34px;border-radius:9px}
.brand-sub{font-size:12px;color:var(--muted);font-weight:500;margin-left:2px;padding:2px 9px;border:1px solid var(--line2);border-radius:999px}
.nav-links{display:flex;align-items:center;gap:4px}
.nav-links a{font-size:15px;font-weight:500;color:var(--ink-soft);padding:8px 15px;border-radius:10px;transition:.16s;position:relative}
.nav-links a:hover{color:var(--brand);background:var(--brand-soft)}
.nav-links a.on{color:var(--brand);font-weight:700;background:var(--brand-soft)}
.nav-links a.on::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--amber);margin-right:7px;vertical-align:2px}
.nav-links a.on::after{content:"";position:absolute;left:15px;right:15px;bottom:3px;height:2px;background:var(--brand);border-radius:1px}
.nav-cta{background:linear-gradient(120deg,var(--brand),var(--brand2));color:#fff!important;font-weight:700;box-shadow:0 6px 18px -8px rgba(51,70,214,.6)}
.nav-cta:hover{background:var(--brand-deep)!important;color:#fff!important}
@media(max-width:860px){.nav-links{display:none}}

/* ============ hero:左文右星图分屏 ============ */
.hero{position:relative;padding:64px 0 76px;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(900px 460px at 18% -10%,rgba(51,70,214,.12),transparent 58%),radial-gradient(600px 360px at 88% 10%,rgba(14,165,233,.10),transparent 60%)}
.hero .wrap{position:relative}
.hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:44px;align-items:center}
.hero-copy{display:flex;flex-direction:column;align-items:flex-start}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:var(--paper3);border:1px solid var(--line);color:var(--brand);font-size:13px;font-weight:600;padding:6px 16px;border-radius:999px;margin-bottom:22px;box-shadow:var(--shadow)}
.hero h1{font-size:clamp(34px,5.6vw,58px);font-weight:800;letter-spacing:-1px;line-height:1.1;margin-bottom:18px}
.hero h1 .hl{color:var(--brand);position:relative}
.hero h1 .hl::after{content:"";position:absolute;left:0;right:0;bottom:5px;height:10px;background:linear-gradient(90deg,rgba(51,70,214,.16),rgba(14,165,233,.16));border-radius:3px}
.hero-sub{font-size:17.5px;color:var(--ink-soft);max-width:520px;margin-bottom:30px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap}
.hero-note{font-size:13px;color:var(--muted);margin-top:18px}
.hero-visual{display:flex;justify-content:center}
.constellation{width:100%;max-width:400px;height:auto}

/* ============ 按钮 ============ */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:13px 28px;font-size:15px;font-weight:700;border-radius:12px;transition:.18s;cursor:pointer;border:1px solid transparent}
.btn-primary{background:linear-gradient(120deg,var(--brand),var(--brand2));color:#fff;box-shadow:0 14px 30px -14px rgba(51,70,214,.7)}
.btn-primary:hover{background:var(--brand-deep);transform:translateY(-1px)}
.btn-ghost{background:var(--paper3);border-color:var(--line2);color:var(--ink)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}
.btn-lg{padding:15px 34px;font-size:16px;border-radius:14px}

/* ============ 通用区块 ============ */
.section{padding:66px 0}
.section.alt{background:var(--paper2);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{max-width:720px;margin:0 auto 40px;text-align:center}
.kicker{display:inline-flex;align-items:center;gap:10px;font-size:13px;font-weight:700;letter-spacing:2px;text-transform:uppercase;color:var(--brand);margin-bottom:12px}
.kicker::before,.kicker::after{content:"";width:24px;height:2px;background:linear-gradient(90deg,var(--brand),var(--brand2));border-radius:1px}
.sec-title{font-size:clamp(24px,3.6vw,34px);font-weight:800;letter-spacing:-.5px;line-height:1.25;margin-bottom:12px}
.sec-sub{font-size:15.5px;color:var(--muted)}

/* ============ 高频问答卡(招牌区,替代对话流) ============ */
.qa-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;max-width:900px;margin:0 auto}
.qa-card{background:var(--paper3);border:1px solid var(--line);border-radius:var(--r);padding:26px;position:relative;transition:.2s;overflow:hidden}
.qa-card::before{content:"";position:absolute;left:0;top:0;bottom:0;width:4px;background:linear-gradient(180deg,var(--brand),var(--brand2))}
.qa-card h3{font-size:17px;font-weight:700;margin-bottom:9px;color:var(--ink)}
.qa-card h3::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--amber);margin-right:9px;vertical-align:2px}
.qa-card p{font-size:14.5px;color:var(--muted)}
.qa-card:hover{border-color:var(--brand2);transform:translateY(-3px);box-shadow:var(--shadow)}
@media(max-width:720px){.qa-grid{grid-template-columns:1fr}}

/* ============ bento 功能网格 ============ */
.bento{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.bento-card{background:var(--paper3);border:1px solid var(--line);border-radius:var(--r);padding:26px;transition:.2s;position:relative}
.bento-card:hover{border-color:var(--brand2);transform:translateY(-3px);box-shadow:var(--shadow)}
.bento-card .ico{width:46px;height:46px;border-radius:12px;background:var(--brand-soft);color:var(--brand);display:flex;align-items:center;justify-content:center;margin-bottom:16px}
.bento-card .ico svg{width:24px;height:24px}
.bento-card h3{font-size:17px;font-weight:700;margin-bottom:7px}
.bento-card p{font-size:14px;color:var(--muted)}
.bento-card.big{grid-column:span 2}
@media(max-width:820px){.bento{grid-template-columns:1fr 1fr}.bento-card.big{grid-column:span 2}}
@media(max-width:560px){.bento{grid-template-columns:1fr}.bento-card.big{grid-column:span 1}}

/* ============ 下载卡片 ============ */
.dl-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.dl-card{background:var(--paper3);border:1px solid var(--line);border-radius:var(--r);padding:24px 18px;text-align:center;transition:.2s}
.dl-card:hover{border-color:var(--brand2);transform:translateY(-3px);box-shadow:var(--shadow)}
.dl-card .ico{width:52px;height:52px;border-radius:14px;background:var(--brand-soft);color:var(--brand);display:flex;align-items:center;justify-content:center;margin:0 auto 14px}
.dl-card .ico svg{width:26px;height:26px}
.dl-card .name{font-size:16px;font-weight:700;margin-bottom:5px}
.dl-card .sub{font-size:12.5px;color:var(--muted);margin-bottom:14px}
.dl-card .meta{font-size:12px;color:var(--muted)}
@media(max-width:900px){.dl-grid{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.dl-grid{grid-template-columns:1fr}}

/* ============ 步骤时间线 ============ */
.steps{max-width:760px;margin:0 auto;position:relative}
.steps::before{content:"";position:absolute;left:26px;top:12px;bottom:12px;width:2px;background:var(--brand-softer)}
.step{position:relative;padding:0 0 32px 72px}
.step:last-child{padding-bottom:0}
.step-num{position:absolute;left:0;top:0;width:54px;height:54px;border-radius:50%;background:linear-gradient(120deg,var(--brand),var(--brand2));color:#fff;font-weight:800;font-size:17px;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 20px -8px rgba(51,70,214,.6)}
.step h3{font-size:17px;font-weight:700;margin-bottom:6px}
.step p{font-size:14.5px;color:var(--muted)}

/* ============ 对比表格 ============ */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r);background:var(--paper3)}
table{width:100%;border-collapse:collapse;font-size:15px}
th,td{text-align:left;padding:13px 18px;border-bottom:1px solid var(--line);color:var(--ink-soft)}
thead th{background:linear-gradient(120deg,var(--brand),var(--brand2));color:#fff;font-weight:700;border-bottom:none}
thead th:first-child{border-top-left-radius:var(--r)}
thead th:last-child{border-top-right-radius:var(--r)}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover td{background:var(--brand-soft)}

/* ============ 内页 hero ============ */
.page-hero{background:linear-gradient(180deg,rgba(51,70,214,.08),rgba(14,165,233,.05));border-bottom:1px solid var(--line);padding:52px 0 42px;text-align:center}
.page-hero h1{font-size:clamp(28px,4.6vw,42px);font-weight:800;letter-spacing:-.5px;margin:14px 0 12px}
.page-hero .lead{font-size:16.5px;color:var(--ink-soft);max-width:720px;margin:0 auto}
.page-hero .kicker{color:var(--brand)}
.crumb{font-size:13px;color:var(--muted);margin-bottom:6px}
.crumb a{color:var(--brand)}
.crumb a:hover{text-decoration:underline}
.crumb .sep{margin:0 8px;color:var(--line2)}

/* ============ 文章双栏 ============ */
.article-layout{display:grid;grid-template-columns:240px 1fr;gap:40px;align-items:start;padding:46px 0}
.toc{position:sticky;top:84px;background:var(--paper3);border:1px solid var(--line);border-radius:var(--r);padding:20px}
.toc h4{font-size:12px;font-weight:700;letter-spacing:2px;text-transform:uppercase;color:var(--muted);margin-bottom:12px;padding-bottom:10px;border-bottom:1px solid var(--line)}
.toc a{display:block;font-size:13.5px;color:var(--ink-soft);padding:7px 0;border-bottom:1px dashed var(--line)}
.toc a:last-child{border-bottom:none}
.toc a:hover{color:var(--brand)}
@media(max-width:880px){.article-layout{grid-template-columns:1fr}.toc{position:static}}
.prose{max-width:760px;color:var(--ink-soft)}
.prose h2{font-size:23px;font-weight:800;color:var(--ink);margin:36px 0 14px;padding-left:14px;border-left:4px solid var(--brand2);line-height:1.35}
.prose h2:first-child{margin-top:6px}
.prose h3{font-size:18px;font-weight:700;color:var(--ink);margin:24px 0 10px}
.prose p{margin-bottom:16px}
.prose > p:first-of-type{font-size:17px;color:var(--ink)}
.prose ul,.prose ol{margin:0 0 18px 22px}
.prose li{margin-bottom:8px}
.prose a{color:var(--brand);border-bottom:1px solid var(--brand-softer)}
.prose a:hover{opacity:.85}
.prose figure{margin:26px 0}
.prose figure img{border:1px solid var(--line);border-radius:var(--r);width:100%}
.prose figcaption{font-size:13px;color:var(--muted);text-align:center;margin-top:8px}
.lead-fig img{aspect-ratio:16/8;object-fit:cover}
.tip{padding:18px 20px;margin:0 0 18px;background:var(--brand-soft);border-left:4px solid var(--brand);border-radius:0 var(--r) var(--r) 0;font-size:15px}
.tip::before{content:"提示";display:block;font-size:12px;font-weight:700;letter-spacing:1px;color:var(--brand);margin-bottom:6px}
.tip p{margin:0}
.callout{padding:18px 20px;margin:0 0 18px;background:var(--deep);border-left:4px solid var(--brand2);border-radius:0 var(--r) var(--r) 0;color:var(--paper)}
.callout::before{content:"结论";display:block;font-size:12px;font-weight:700;letter-spacing:1px;color:var(--brand2);margin-bottom:6px}
.callout p{margin:0;color:var(--paper)}

/* ============ 相关卡片 ============ */
.rel-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.rel-card{background:var(--paper3);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:.2s}
.rel-card:hover{border-color:var(--brand2);transform:translateY(-3px)}
.rel-card a{display:block;padding:22px}
.rel-card .t{font-size:16px;font-weight:700;margin-bottom:6px;color:var(--ink)}
.rel-card .d{font-size:13.5px;color:var(--muted)}
@media(max-width:820px){.rel-grid{grid-template-columns:1fr}}

/* ============ FAQ ============ */
.faq-block{max-width:820px;margin:0 auto}
details{background:var(--paper3);border:1px solid var(--line);border-radius:var(--r);margin-bottom:12px;overflow:hidden}
summary{cursor:pointer;padding:18px 20px;font-weight:700;font-size:16px;list-style:none;display:flex;justify-content:space-between;align-items:center}
summary::after{content:"+";font-size:22px;color:var(--brand);font-weight:600}
details[open] summary{color:var(--brand)}
details[open] summary::after{content:"−"}
details .a{padding:0 20px 18px;color:var(--ink-soft);font-size:15px}

/* ============ CTA 横幅 ============ */
.cta-band{text-align:center;background:var(--deep);color:var(--paper);padding:56px 32px;border-radius:var(--r);position:relative;overflow:hidden}
.cta-band::before{content:"";position:absolute;inset:0;background:radial-gradient(600px 300px at 50% 0,rgba(14,165,233,.35),transparent 70%)}
.cta-band > *{position:relative}
.cta-title{font-size:clamp(22px,3vw,30px);font-weight:800;margin-bottom:12px}
.cta-band p{color:rgba(246,248,253,.75);max-width:560px;margin:0 auto 26px}
.cta-band .btn-primary{background:linear-gradient(120deg,var(--brand),var(--brand2))}

/* ============ 页脚 ============ */
.pfoot{margin-top:60px;background:var(--deep);color:var(--paper);border-top:3px solid var(--brand2)}
.pfoot-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:34px 24px;flex-wrap:wrap}
.pfoot-brand{font-weight:800;font-size:18px;display:flex;align-items:center;gap:12px}
.pfoot-brand img{width:26px;height:26px;border-radius:7px}
.pfoot-brand em{font-style:normal;font-weight:500;font-size:12px;letter-spacing:2px;color:rgba(246,248,253,.6);padding:3px 10px;border:1px solid rgba(246,248,253,.3);border-radius:999px}
.pfoot-star{color:var(--amber);width:20px;height:20px}
.pfoot-star svg{width:16px;height:16px}
.pfoot-copy{color:rgba(246,248,253,.6);font-size:13px}

/* ============ backtop / 其他 ============ */
.backtop{position:fixed;right:22px;bottom:22px;width:46px;height:46px;border-radius:50%;background:linear-gradient(120deg,var(--brand),var(--brand2));color:#fff;font-size:18px;cursor:pointer;opacity:0;visibility:hidden;transition:.25s;z-index:40;border:none;box-shadow:0 10px 24px -10px rgba(51,70,214,.6)}
.backtop.show{opacity:1;visibility:visible}
.backtop:hover{background:var(--brand-deep)}
.notfound{text-align:center;padding:60px 0}
.notfound .big{font-size:90px;font-weight:800;color:var(--line2);letter-spacing:8px;margin-bottom:10px}
.notfound p{color:var(--muted);margin-bottom:26px}
.search-box{display:flex;gap:12px;max-width:560px;margin:22px auto 0}
.search-input{flex:1;background:var(--paper3);border:1px solid var(--line2);border-radius:12px;padding:13px 18px;color:var(--ink);font-size:15px;outline:none}
.search-input:focus{border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
.search-input::placeholder{color:var(--muted)}
.split{display:grid;grid-template-columns:1.1fr 1fr;gap:40px;align-items:center}
.split .img-frame{background:var(--paper2);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
.split .img-frame img{width:100%;aspect-ratio:16/10;object-fit:cover}
.split h2{font-size:clamp(22px,3vw,30px);font-weight:800;margin:10px 0 14px}
.split p{color:var(--ink-soft);margin-bottom:14px}
@media(max-width:820px){.split{grid-template-columns:1fr}}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.gallery-card{background:var(--paper3);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;transition:.2s}
.gallery-card:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.gallery-card img{width:100%;aspect-ratio:16/11;object-fit:cover}
.gallery-card figcaption{padding:15px 18px;border-top:2px solid var(--brand2)}
.gallery-card figcaption b{display:block;font-size:15px;margin-bottom:3px}
.gallery-card figcaption span{font-size:13px;color:var(--muted)}
@media(max-width:820px){.gallery{grid-template-columns:1fr 1fr}}
@media(max-width:540px){.gallery{grid-template-columns:1fr}}

/* 响应式 hero */
@media(max-width:820px){.hero-grid{grid-template-columns:1fr}.hero-visual{order:-1;max-width:320px;margin:0 auto}}