:root{
  --bg:#0b0c10; --bg2:#0e0f14; --panel:#14161c; --panel2:#1a1d25;
  --line:#262a33; --txt:#e8eaed; --mut:#9aa0ac; --acc:#6d8bff; --acc2:#8aa0ff;
  --c-text:#38bdf8; --c-image:#f472b6; --c-video:#a78bfa; --c-audio:#34d399; --c-subject:#fbbf24;
  --radius:16px; --max:1180px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  background:var(--bg); color:var(--txt); line-height:1.6;
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,'PingFang SC','Microsoft YaHei',sans-serif;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 22px}
h1,h2,h3,h4{margin:0;font-weight:700;letter-spacing:.2px}
.muted{color:var(--mut)}
.small{font-size:13px}

/* 按钮 */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:10px 18px;border-radius:10px;font-size:14px;font-weight:600;cursor:pointer;border:1px solid transparent;transition:.15s}
.btn:hover{transform:translateY(-1px)}
.btn.primary{background:var(--acc);color:#fff}
.btn.primary:hover{background:var(--acc2)}
.btn.ghost{background:transparent;color:var(--txt);border-color:var(--line)}
.btn.ghost:hover{border-color:var(--acc);color:var(--acc2)}
.btn.danger{background:transparent;color:#ff7b86;border-color:#5a2b30}
.btn.danger:hover{background:#2a1518}
.btn.lg{padding:14px 26px;font-size:15px}
.btn.sm{padding:7px 13px;font-size:13px}
.btn.block{width:100%;margin-top:12px}

/* 导航 */
.nav{position:sticky;top:0;z-index:50;background:rgba(11,12,16,.82);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav-inner{display:flex;align-items:center;gap:26px;height:64px}
.logo{display:flex;align-items:center;gap:8px;font-weight:800;font-size:18px;letter-spacing:.5px}
.logo-mark{color:var(--acc)}
.logo.small{font-size:16px}
.links{display:flex;gap:22px;flex:1}
.links a{color:var(--mut);font-size:14px;font-weight:500;padding:6px 0;position:relative}
.links a:hover,.links a.active{color:var(--txt)}
.links a.active::after{content:"";position:absolute;left:0;right:0;bottom:-21px;height:2px;background:var(--acc)}
.nav-right{display:flex;align-items:center;gap:10px}
.who{color:var(--mut);font-size:13px}
.burger{display:none;background:none;border:0;color:var(--txt);font-size:24px;cursor:pointer}

/* Hero */
.hero{position:relative;padding:96px 0 70px;overflow:hidden;text-align:center}
.hero.mini{padding:64px 0 40px}
.hero-glow{position:absolute;top:-180px;left:50%;transform:translateX(-50%);width:760px;height:520px;background:radial-gradient(closest-side,rgba(109,139,255,.22),transparent);filter:blur(20px);pointer-events:none}
.hero-content{position:relative;max-width:780px;margin:0 auto}
.hero-content.center{text-align:center}
.pill{display:inline-block;padding:7px 14px;border:1px solid var(--line);border-radius:999px;color:var(--mut);font-size:13px;margin-bottom:22px;background:var(--panel)}
.hero h1{font-size:clamp(34px,5vw,56px);line-height:1.1;letter-spacing:-.5px}
.lead{color:var(--mut);font-size:clamp(15px,2vw,18px);max-width:620px;margin:20px auto 0}
.hero-cta{display:flex;gap:14px;justify-content:center;margin-top:32px;flex-wrap:wrap}

/* Section */
.sec-title{font-size:30px;text-align:center;margin-bottom:8px}
.sec-title.left{text-align:left}
.sec-sub{color:var(--mut);text-align:center;margin-bottom:38px}
.sec-sub.left{text-align:left;margin-bottom:18px}

/* 节点卡 */
.grid5{display:grid;grid-template-columns:repeat(5,1fr);gap:16px}
.node-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:22px 18px;transition:.18s}
.node-card:hover{transform:translateY(-4px);border-color:var(--acc)}
.node-ico{width:42px;height:42px;border-radius:11px;display:grid;place-items:center;font-size:20px;font-weight:800;margin-bottom:14px}
.node-card h3{font-size:16px;margin-bottom:8px}
.node-card p{color:var(--mut);font-size:13px;margin:0}
.c-text .node-ico{background:rgba(56,189,248,.15);color:var(--c-text)}
.c-image .node-ico{background:rgba(244,114,182,.15);color:var(--c-image)}
.c-video .node-ico{background:rgba(167,139,250,.15);color:var(--c-video)}
.c-audio .node-ico{background:rgba(52,211,153,.15);color:var(--c-audio)}
.c-subject .node-ico{background:rgba(251,191,36,.15);color:var(--c-subject)}

/* 画布预览 */
.canvas-preview{padding:80px 0;background:linear-gradient(180deg,var(--bg),var(--bg2))}
.canvas-inner{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center}
.feat{list-style:none;padding:0;margin:18px 0 24px}
.feat li{color:var(--mut);padding:7px 0 7px 24px;position:relative;font-size:14px}
.feat li::before{content:"◆";position:absolute;left:0;color:var(--acc);font-size:11px;top:9px}
.canvas-mock{position:relative;height:300px;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.mock-node{position:absolute;background:var(--panel2);border:1px solid var(--line);border-radius:10px;padding:8px 12px;font-size:13px;display:flex;align-items:center;gap:8px;box-shadow:0 8px 24px rgba(0,0,0,.35)}
.mock-node .dot{width:8px;height:8px;border-radius:50%}
.n1{left:24px;top:26px}.n2{left:150px;top:96px}.n3{left:120px;top:170px}.n4{left:250px;top:60px}.n5{left:230px;top:180px}
.mock-edges{position:absolute;inset:0;width:100%;height:100%}
.mock-edges path{fill:none;stroke:var(--acc);stroke-width:1.5;opacity:.55;stroke-dasharray:4 4}

/* CTA band */
.cta-band{text-align:center;padding:70px 0;border-top:1px solid var(--line);background:var(--bg2)}
.cta-band h2{font-size:28px;margin-bottom:8px}

/* 套餐 */
.plans{padding:30px 0 80px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.plan{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:30px 26px;position:relative}
.plan.hot{border-color:var(--acc);box-shadow:0 0 0 1px var(--acc),0 20px 50px rgba(109,139,255,.12)}
.plan .tag{position:absolute;top:-12px;left:26px;background:var(--acc);color:#fff;font-size:12px;padding:4px 12px;border-radius:999px}
.plan h3{font-size:20px;margin-bottom:14px}
.price{font-size:40px;font-weight:800;margin-bottom:4px}
.price .cur{font-size:20px;vertical-align:top;margin-right:2px}
.price .per{font-size:14px;color:var(--mut);font-weight:500;margin-left:4px}
.plan ul{list-style:none;padding:0;margin:18px 0}
.plan li{padding:8px 0 8px 22px;position:relative;color:var(--mut);font-size:14px;border-bottom:1px solid var(--line)}
.plan li::before{content:"✓";position:absolute;left:0;color:var(--acc)}
.faq{padding:30px 0 90px}
.faq-list{max-width:760px;margin:0 auto}
.faq details{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:16px 20px;margin-bottom:12px}
.faq summary{cursor:pointer;font-weight:600}
.faq details p{color:var(--mut);font-size:14px;margin:10px 0 0}

/* 关于 */
.about{padding:30px 0 80px}
.about-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:44px;align-items:center}
.values{display:flex;flex-direction:column;gap:14px;margin-top:18px}
.value{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px 18px}
.value b{display:block;color:var(--acc2);margin-bottom:2px}
.value span{color:var(--mut);font-size:14px}
.stats{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:26px 22px;text-align:center}
.stat b{display:block;font-size:30px;color:var(--acc);margin-bottom:4px}
.stat span{color:var(--mut);font-size:13px}

/* 认证 */
.auth{padding:70px 0 90px;display:grid;place-items:center}
.auth-card{width:400px;max-width:92vw;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:36px}
.auth-card h1{font-size:26px;margin-bottom:6px}
.auth label{display:block;font-size:13px;color:var(--mut);margin:16px 0 6px}
.auth input{width:100%;padding:12px 14px;border-radius:10px;border:1px solid var(--line);background:#0f1116;color:var(--txt);font-size:14px}
.auth input:focus{outline:none;border-color:var(--acc)}
.alt{text-align:center;color:var(--mut);font-size:14px;margin-top:18px}
.alt a{color:var(--acc2)}
.msg{display:none;padding:11px 13px;border-radius:10px;font-size:13px;margin:6px 0 4px}
.msg.err{display:block;background:#3a1d22;border:1px solid #6b2b34;color:#ff9aa6}
.msg.ok{display:block;background:#16301f;border:1px solid #2e6b45;color:#8df0ad}
.msg.info{display:block;background:#15233a;border:1px solid #284a73;color:#9cc4ff}

/* 工作台 */
.dashboard{padding:40px 0 80px;min-height:60vh}
.dash-head{display:flex;justify-content:space-between;align-items:flex-end;margin-bottom:26px}
.dash-head h1{font-size:28px;margin-bottom:4px}
.empty{text-align:center;padding:60px 0;color:var(--mut)}
.empty p{margin-bottom:18px}
.proj-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:18px}
.proj-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:18px}
.proj-thumb{height:120px;border-radius:12px;background:radial-gradient(circle at 30% 30%,rgba(109,139,255,.25),transparent),var(--panel2);display:grid;place-items:center;font-size:40px;color:var(--acc);margin-bottom:14px}
.proj-card h3{font-size:16px;margin-bottom:4px}
.proj-actions{display:flex;gap:10px;margin-top:14px}

/* 页脚 */
.footer{border-top:1px solid var(--line);background:var(--bg2);padding:50px 0 30px;margin-top:40px}
.footer-inner{display:grid;grid-template-columns:1.4fr 2fr;gap:40px}
.footer .logo{margin-bottom:12px}
.footer .muted{font-size:14px;max-width:320px}
.cols{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.cols h4{font-size:14px;margin-bottom:12px;color:var(--txt)}
.cols a{display:block;color:var(--mut);font-size:13px;padding:4px 0}
.cols a:hover{color:var(--acc2)}
.copy{color:var(--mut);font-size:12px;text-align:center;margin-top:34px;padding-top:20px;border-top:1px solid var(--line)}

/* 响应式 */
@media(max-width:980px){
  .grid5{grid-template-columns:repeat(2,1fr)}
  .canvas-inner,.about-grid{grid-template-columns:1fr}
  .grid3{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
}
@media(max-width:680px){
  .links{display:none}
  .burger{display:block;margin-left:auto}
  .nav-right{display:none}
  .grid5{grid-template-columns:1fr}
  .stats{grid-template-columns:1fr 1fr}
  .cols{grid-template-columns:1fr 1fr}
}

/* 管理配置表单 */
.cfg{max-width:640px;margin-top:22px}
.cfg label{display:block;font-size:13px;color:var(--mut);margin:16px 0 6px}
.cfg input,.cfg select{width:100%;padding:11px 13px;border-radius:10px;border:1px solid var(--line);background:#0f1116;color:var(--txt);font-size:14px}
.cfg input:focus,.cfg select:focus{outline:none;border-color:var(--acc)}
.cfg .grid2{display:grid;grid-template-columns:1fr 1fr;gap:0 16px}
.cfg .row{display:flex;gap:12px;margin-top:24px}