/* ===== Gogo Portal · Design System v3（实色 / 单行口号 / 双引擎） ===== */
:root{
  --bg:#F5F7FB; --surface:#FFFFFF; --surface-2:#EEF2F9; --text:#0F172A; --text-sub:#4A5B76;
  --border:#E3E9F2; --shadow:0 8px 30px rgba(15,23,42,.08);
  --blue:#0B57E8; --blue-soft:rgba(11,87,232,.08);
  --purple:#6D28D9; --purple-soft:rgba(109,40,217,.08);
  --radius:16px; --font-sans:"Inter","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",Consolas,monospace;
}
[data-theme="dark"]{
  --bg:#0A0F1E; --surface:#131A2C; --surface-2:#1A2236; --text:#F2F6FD; --text-sub:#A8B6CF;
  --border:#243150; --shadow:0 8px 30px rgba(0,0,0,.45);
  --blue:#4C8DFF; --blue-soft:rgba(76,141,255,.12);
  --purple:#A97BFF; --purple-soft:rgba(169,123,255,.12);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-sans);background:var(--bg);color:var(--text);line-height:1.6;transition:background .3s,color .3s;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
.wrap{max-width:1200px;margin:0 auto;padding:0 20px}
img{max-width:100%}

/* NAV */
nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(12px);background:color-mix(in srgb,var(--surface) 85%,transparent);border-bottom:1px solid var(--border)}
.nav-in{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;letter-spacing:.5px}
.logo .dot{width:10px;height:10px;border-radius:50%;background:var(--blue);box-shadow:0 0 10px var(--blue)}
.logo .dot2{background:var(--purple);box-shadow:0 0 10px var(--purple)}
.nav-links{display:flex;gap:22px;align-items:center;font-size:15px;font-weight:500}
.nav-links a{color:var(--text-sub);transition:color .2s;display:flex;align-items:center;gap:6px;padding:6px 2px}
.nav-links a:hover,.nav-links a.active{color:var(--text);font-weight:600}
.tag-dot{width:7px;height:7px;border-radius:50%}
.nav-right{display:flex;align-items:center;gap:12px}
.btn{border:none;cursor:pointer;font-family:inherit;font-weight:700;border-radius:10px;padding:10px 18px;font-size:14px;transition:transform .15s,box-shadow .2s;display:inline-flex;align-items:center;gap:8px}
.btn-ghost{background:var(--surface-2);color:var(--text);border:1px solid var(--border)}
.btn-solid{background:var(--blue);color:#fff}
.btn-purple{background:var(--purple);color:#fff}
[data-theme="dark"] .btn-solid,[data-theme="dark"] .btn-purple{color:#0A0F1E}
.btn:hover{transform:translateY(-2px)}
.theme-toggle{width:40px;height:40px;border-radius:50%;border:1px solid var(--border);background:var(--surface);cursor:pointer;font-size:18px;display:grid;place-items:center;color:var(--text)}
.hamburger{display:none;background:none;border:none;color:var(--text);font-size:24px;cursor:pointer}
.mobile-menu{display:none;flex-direction:column;gap:4px;padding:10px 20px 16px;border-bottom:1px solid var(--border);background:var(--surface)}
.mobile-menu a{padding:10px 4px;color:var(--text-sub);border-bottom:1px solid var(--border)}
.mobile-menu a:last-child{border-bottom:none}
.mobile-menu .mm-roles{display:flex;flex-direction:column}
.mobile-menu .mm-role{display:flex;align-items:center;gap:8px;padding:10px 4px;color:var(--text-sub);border-bottom:1px solid var(--border);background:none;border-left:none;border-right:none;border-top:none;font:inherit;cursor:pointer;text-align:left}
.mobile-menu .mm-role .ic{font-size:18px}

/* 注册登陆 下拉 */
.login-wrap{position:relative}
.login-drop{position:absolute;right:0;top:calc(100% + 10px);width:280px;background:var(--surface);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow);padding:10px;display:none;z-index:60}
.login-drop.open{display:block}
.login-drop .drop-hint{font-size:13px;font-weight:700;color:var(--text);padding:6px 8px 10px}
.login-drop .drop-role{display:flex;align-items:center;gap:10px;width:100%;background:none;border:none;font:inherit;font-size:14px;color:var(--text-sub);padding:10px 10px;border-radius:10px;cursor:pointer;text-align:left;transition:.15s}
.login-drop .drop-role:hover{background:var(--surface-2);color:var(--text)}
.login-drop .drop-role .ic{width:34px;height:34px;border-radius:10px;display:grid;place-items:center;font-size:17px;flex:0 0 auto}
.login-drop .drop-role b{display:block;font-size:14px;font-weight:700;color:var(--text)}
.login-drop .drop-role span{display:block;font-size:12px;line-height:1.45}

/* 角色弹窗 */
.modal-mask{position:fixed;inset:0;background:rgba(4,8,20,.62);backdrop-filter:blur(4px);display:none;place-items:center;z-index:100;padding:20px}
.modal-mask.open{display:grid}
.modal{background:var(--surface);border:1px solid var(--border);border-radius:18px;box-shadow:var(--shadow);max-width:420px;width:100%;padding:30px 28px;position:relative;text-align:center;animation:pop .25s ease}
@keyframes pop{from{opacity:0;transform:translateY(14px) scale(.97)}to{opacity:1;transform:none}}
.modal .m-ic{width:60px;height:60px;border-radius:16px;display:grid;place-items:center;font-size:30px;margin:0 auto 14px}
.modal h4{font-size:19px;font-weight:800;margin-bottom:8px}
.modal p{font-size:14px;color:var(--text-sub);margin-bottom:20px}
.modal .m-actions{display:flex;flex-direction:column;gap:10px}
.modal .m-actions .btn{justify-content:center}
.modal-x{position:absolute;top:12px;right:14px;background:none;border:none;font-size:22px;color:var(--text-sub);cursor:pointer;line-height:1}
.modal-x:hover{color:var(--text)}

/* HERO —— 口号强制单行 */
.hero{position:relative;overflow:hidden;padding:84px 0 64px;text-align:center}
.hero::before{content:"";position:absolute;inset:-40% -10% auto -10%;height:520px;background:radial-gradient(60% 60% at 30% 20%,var(--blue-soft),transparent),radial-gradient(60% 60% at 75% 30%,var(--purple-soft),transparent);filter:blur(20px);animation:flow 14s ease-in-out infinite alternate}
@keyframes flow{0%{background-position:0 0,100% 0;transform:translateX(-3%)}100%{background-position:30% 20%,70% 10%;transform:translateX(3%)}}
.hero h1{font-size:clamp(19px,4.6vw,52px);font-weight:800;line-height:1.2;white-space:nowrap;position:relative;margin:0 auto;letter-spacing:.01em}
.hero h1 .slogan-word{display:inline-block;opacity:0;transform:translateY(22px);animation:wordIn .6s cubic-bezier(.2,.7,.3,1) forwards}
.hero h1 .slogan-word .word-in{display:inline-block;color:var(--wcolor,var(--text));animation:glowPulse 3.2s ease-in-out infinite;animation-delay:var(--wdelay,0s)}
.hero h1 .slogan-word .word-in.w-blue{--wcolor:var(--blue)}
.hero h1 .slogan-word .word-in.w-purple{--wcolor:var(--purple)}
@keyframes wordIn{to{opacity:1;transform:none}}
@keyframes glowPulse{0%,100%{text-shadow:0 0 0 transparent}50%{text-shadow:0 0 22px color-mix(in srgb,var(--wcolor,var(--text)) 55%,transparent)}}
.hero p.sub{font-size:clamp(15px,2vw,18px);color:var(--text-sub);max-width:760px;margin:20px auto 0;position:relative;opacity:0;animation:fadeUp .8s ease .5s forwards}
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.hero .cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:32px;position:relative;opacity:0;animation:fadeUp .8s ease .8s forwards}

/* SECTIONS */
.section{padding:60px 0}
.sec-head{text-align:center;margin-bottom:36px}
.sec-kicker{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--text-sub);margin-bottom:10px}
.sec-kicker .bar{width:26px;height:3px;border-radius:2px}
.sec-kicker.blue .bar{background:var(--blue)} .sec-kicker.purple .bar{background:var(--purple)}
.sec-title{text-align:center;font-size:clamp(24px,3vw,34px);font-weight:800;margin-bottom:8px}
.sec-sub{text-align:center;color:var(--text-sub);margin-bottom:0}

/* 双引擎（整块，非左右卡） */
.engine{background:var(--surface);border:1px solid var(--border);border-radius:20px;box-shadow:var(--shadow);overflow:hidden;margin-bottom:26px}
.engine .ebar{height:6px}
.engine.blue .ebar{background:var(--blue)} .engine.purple .ebar{background:var(--purple)}
.engine .ehead{padding:28px 30px 0;display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:12px}
.engine .ehead h3{font-size:clamp(20px,2.4vw,26px);font-weight:800}
.engine.blue .ehead h3{color:var(--blue)} .engine.purple .ehead h3{color:var(--purple)}
.engine .ehead .esub{font-size:14.5px;color:var(--text-sub);font-weight:600}
.engine .etag{font-size:13.5px;color:var(--text-sub);padding:8px 30px 0}
.engine .etag b{color:var(--text)}
.sitechips{display:flex;gap:12px;flex-wrap:wrap;padding:16px 30px 0}
.sitechip{display:inline-flex;align-items:center;gap:8px;padding:9px 16px;border-radius:12px;font-size:13.5px;font-weight:700;border:1px solid var(--border);background:var(--surface-2);color:var(--text);transition:.2s}
.sitechip .dom{font-family:var(--font-mono);font-size:12px;font-weight:500;color:var(--text-sub)}
.sitechip:hover{transform:translateY(-2px)}
.sitechip.blue{border-color:var(--blue);background:var(--blue-soft)} .sitechip.blue .dom{color:var(--blue)}
.sitechip.purple{border-color:var(--purple);background:var(--purple-soft)} .sitechip.purple .dom{color:var(--purple)}
.engine .tabs{display:flex;gap:8px;padding:18px 30px 0;overflow-x:auto;scrollbar-width:none}
.engine .tabs::-webkit-scrollbar{display:none}
.tab{flex:0 0 auto;padding:8px 14px;border-radius:10px;font-size:13.5px;font-weight:700;cursor:pointer;background:var(--surface-2);color:var(--text-sub);border:1px solid transparent;white-space:nowrap;transition:.2s}
.engine.blue .tab.active{background:var(--blue-soft);color:var(--blue);border-color:var(--blue)}
.engine.purple .tab.active{background:var(--purple-soft);color:var(--purple);border-color:var(--purple)}
.panel{padding:18px 30px 28px;display:none;animation:fade .35s ease}
.panel.active{display:block}
@keyframes fade{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.panel h4{font-size:16.5px;font-weight:800;margin-bottom:10px}
.panel ul{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:8px 26px}
.panel li{font-size:14px;color:var(--text-sub);padding-left:20px;position:relative}
.panel li::before{content:"";position:absolute;left:0;top:9px;width:7px;height:7px;border-radius:50%}
.engine.blue .panel li::before{background:var(--blue)} .engine.purple .panel li::before{background:var(--purple)}
.panel .go{display:inline-block;margin-top:16px;font-weight:800;font-size:14px}
.engine.blue .panel .go{color:var(--blue)} .engine.purple .panel .go{color:var(--purple)}

/* 特性卡（内页与资讯） */
.cardgrid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:8px}
.cardgrid.cols2{grid-template-columns:repeat(2,1fr)}
.fcard{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);transition:.2s;position:relative;overflow:hidden}
.fcard:hover{transform:translateY(-4px)}
.fcard .topbar{position:absolute;top:0;left:0;right:0;height:4px}
.fcard.blue .topbar{background:var(--blue)} .fcard.purple .topbar{background:var(--purple)}
.fcard .fic{font-size:24px;margin-bottom:10px}
.fcard h4{font-size:16.5px;font-weight:800;margin-bottom:8px}
.fcard.blue h4{color:var(--blue)} .fcard.purple h4{color:var(--purple)}
.fcard p{font-size:13.5px;color:var(--text-sub)}
.fcard ul{list-style:none;margin-top:10px;display:flex;flex-direction:column;gap:6px}
.fcard ul li{font-size:13px;color:var(--text-sub);padding-left:16px;position:relative}
.fcard ul li::before{content:"";position:absolute;left:0;top:8px;width:6px;height:6px;border-radius:50%;background:var(--text-sub)}
.fcard .tags{margin-top:12px;display:flex;flex-wrap:wrap;gap:8px}
.fcard .tag{font-size:12px;padding:4px 10px;border-radius:20px;font-weight:600}
.fcard.blue .tag{background:var(--blue-soft);color:var(--blue)}
.fcard.purple .tag{background:var(--purple-soft);color:var(--purple)}

/* PAGE HERO（内页） */
.page-hero{padding:60px 0 30px;text-align:center;position:relative;overflow:hidden}
.page-hero .bar{height:5px;width:80px;margin:0 auto 18px;border-radius:4px}
.page-hero.blue .bar{background:var(--blue)} .page-hero.purple .bar{background:var(--purple)}
.page-hero h1{font-size:clamp(26px,4vw,40px);font-weight:800}
.page-hero.blue h1{color:var(--blue)} .page-hero.purple h1{color:var(--purple)}
.page-hero p{color:var(--text-sub);max-width:760px;margin:14px auto 0}

/* NEWS */
.news-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.news{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);transition:.2s;display:flex;flex-direction:column}
.news:hover{transform:translateY(-4px)}
.news .ntype{font-size:11px;font-weight:700;padding:3px 9px;border-radius:6px;align-self:flex-start;margin-bottom:10px}
.news.ai .ntype{background:var(--purple-soft);color:var(--purple)}
.news.community .ntype{background:var(--blue-soft);color:var(--blue)}
.news h4{font-size:16px;font-weight:700;line-height:1.4}
.news p{font-size:13.5px;color:var(--text-sub);margin:10px 0 14px;flex:1}
.news .go{font-weight:700;font-size:13px;color:var(--text-sub)}
.filterbar{display:flex;gap:10px;justify-content:center;margin-bottom:26px;flex-wrap:wrap}
.filterbar a{padding:8px 16px;border-radius:20px;font-size:13.5px;font-weight:700;background:var(--surface-2);color:var(--text-sub);border:1px solid var(--border)}
.filterbar a.active{background:var(--blue);color:#fff;border-color:var(--blue)}
[data-theme="dark"] .filterbar a.active{color:#0A0F1E}

/* FOOTER */
footer{border-top:1px solid var(--border);background:var(--surface);padding:46px 0 24px;margin-top:46px}
.foot-rows{display:flex;flex-direction:column;gap:18px;margin-bottom:30px}
.foot-row{display:flex;gap:14px;align-items:baseline;flex-wrap:wrap}
.foot-row .fr-label{font-size:13.5px;font-weight:800;color:var(--text);flex:0 0 auto;min-width:130px}
.foot-row .fr-links{display:flex;gap:8px 22px;flex-wrap:wrap}
.foot-row .fr-links a{font-size:13.5px;color:var(--text-sub);transition:.15s;position:relative}
.foot-row .fr-links a:hover{color:var(--text);text-decoration:underline}
.foot-row .fr-links a .dom{font-family:var(--font-mono);font-size:11.5px;color:var(--text-sub);opacity:.85;margin-left:3px}
.foot-row.qual-links .fr-links a::before{content:"·";margin-right:6px;color:var(--text-sub)}
.foot-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;border-top:1px solid var(--border);padding-top:28px}
.foot-col h5{font-size:14px;font-weight:800;margin-bottom:14px}
.foot-col a,.foot-col span{display:block;font-size:13px;color:var(--text-sub);margin-bottom:8px}
.foot-col a:hover{color:var(--text)}
.foot-bottom{border-top:1px solid var(--border);margin-top:30px;padding-top:18px;font-size:12.5px;color:var(--text-sub);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
.foot-bottom a{color:var(--text-sub)}
.foot-bottom a:hover{text-decoration:underline}

.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s,transform .6s}
.reveal.in{opacity:1;transform:none}

/* RESPONSIVE */
@media(max-width:1024px){
  .nav-links{display:none}.hamburger{display:block}
  .panel ul{grid-template-columns:1fr}
  .cardgrid,.news-list{grid-template-columns:repeat(2,1fr)}
  .cardgrid.cols2{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:repeat(2,1fr)}
  .foot-row .fr-label{min-width:100%}
}
@media(max-width:560px){
  .cardgrid,.news-list,.foot-grid{grid-template-columns:1fr}
  .hero{padding:56px 0 44px}
  .hero h1{white-space:normal;font-size:clamp(21px,6.4vw,26px)}
  .hero h1 .slogan-word{display:inline}
  .engine .ehead,.engine .etag,.sitechips,.engine .tabs,.panel{padding-left:20px;padding-right:20px}
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}.reveal,.hero p.sub,.hero .cta{opacity:1;transform:none}.slogan-word,.hero h1 .slogan-word{opacity:1;transform:none}}