:root{
  --bg:#F4F7FF; --surface:#FFFFFF; --ink:#0B1230; --muted:#59627F;
  --line:#E0E6F5; --accent:#2457FF; --accent-ink:#FFFFFF; --accent2:#00B8FF; --accent3:#7B5CFF; --note:#FFD84A;
  --soft:#E9EEFF; --radius-lg:22px; --radius-sm:12px;
  --shadow:0 30px 70px -30px rgba(36,87,255,.38);
  --band1:#080E2E; --band2:#16226B;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#070B1E; --surface:#0F1636; --ink:#EAF0FF; --muted:#93A0C4; --line:#1F2950;
    --accent:#6C8CFF; --accent-ink:#070B1E; --accent2:#33CFFF; --accent3:#9B83FF; --soft:#18214A;
    --shadow:0 30px 70px -30px rgba(0,0,0,.7);
  }
}
:root[data-theme="dark"]{
  --bg:#070B1E; --surface:#0F1636; --ink:#EAF0FF; --muted:#93A0C4; --line:#1F2950;
  --accent:#6C8CFF; --accent-ink:#070B1E; --accent2:#33CFFF; --accent3:#9B83FF; --soft:#18214A;
  --shadow:0 30px 70px -30px rgba(0,0,0,.7);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion: reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
body{
  background:var(--bg); color:var(--ink);
  font-family:"PingFang SC","HarmonyOS Sans SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans SC",system-ui,sans-serif;
  font-size:16px; line-height:1.7; -webkit-font-smoothing:antialiased;
}
a{color:inherit}
:focus-visible{outline:3px solid var(--accent);outline-offset:3px;border-radius:6px}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
section{padding:112px 0}
h1,h2,h3{line-height:1.2;letter-spacing:-.02em}
h2{font-size:clamp(30px,4.6vw,48px);font-weight:900;margin-bottom:14px}
.lead{color:var(--muted);max-width:38em;font-size:18px}
.gt{background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:999px;font-weight:700;text-decoration:none;border:2px solid var(--ink);font-size:16px;cursor:pointer;background:none;color:var(--ink);transition:transform .2s,box-shadow .2s}
.btn.primary{background:linear-gradient(135deg,var(--accent),var(--accent3));border-color:transparent;color:#fff;box-shadow:0 12px 30px -12px var(--accent)}
.btn:hover{transform:translateY(-2px)}

/* nav */
header{position:sticky;top:0;z-index:20;background:color-mix(in srgb,var(--bg) 82%,transparent);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo{display:flex;align-items:center;gap:10px;font-weight:900;font-size:19px;text-decoration:none;letter-spacing:-.01em}
.logo .mark{width:32px;height:32px;display:block}
.links{display:flex;gap:30px;align-items:center}
.links a{text-decoration:none;color:var(--muted);font-size:15px}
.links a:hover{color:var(--ink)}
.links a.cur{color:var(--ink);font-weight:700}
.links .btn{color:#fff;padding:9px 20px;font-size:15px}
.menu-btn{display:none;background:none;border:0;color:var(--ink);font-size:15px;font-weight:700;cursor:pointer}
@media (max-width:860px){
  .menu-btn{display:block}
  .links{display:none;position:absolute;top:72px;left:0;right:0;background:var(--surface);flex-direction:column;align-items:flex-start;padding:18px 24px 24px;gap:16px;border-bottom:1px solid var(--line)}
  .links.open{display:flex}
}
.lang-btn{background:none;border:1px solid var(--line);color:var(--muted);border-radius:999px;padding:4px 12px;font:inherit;font-size:13px;font-weight:700;cursor:pointer}
.lang-btn:hover{color:var(--ink);border-color:var(--ink)}

/* hero */
.hero{position:relative;padding:88px 0 150px;overflow:hidden}
.hero::before,.hero::after{content:"";position:absolute;border-radius:50%;pointer-events:none}
.hero::before{width:820px;height:820px;right:-220px;top:-260px;background:radial-gradient(closest-side,color-mix(in srgb,var(--accent2) 30%,transparent),transparent)}
.hero::after{width:700px;height:700px;left:-260px;bottom:-320px;background:radial-gradient(closest-side,color-mix(in srgb,var(--accent3) 22%,transparent),transparent)}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:1.05fr 1fr;gap:40px;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:700;color:var(--accent);background:var(--soft);padding:6px 16px;border-radius:999px;margin-bottom:24px}
.eyebrow::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--accent2);box-shadow:0 0 0 4px color-mix(in srgb,var(--accent2) 25%,transparent)}
.hero h1{font-size:clamp(40px,6.4vw,76px);font-weight:900;line-height:1.08;letter-spacing:-.035em;margin-bottom:24px}
.hero p{font-size:19px;color:var(--muted);margin-bottom:36px;max-width:30em}
.hero .actions{display:flex;gap:14px;flex-wrap:wrap}
@media (max-width:960px){.hero{padding:56px 0 120px}.hero-grid{grid-template-columns:1fr;gap:24px}}

/* isometric visual */
.iso{position:relative;max-width:540px;margin:0 auto;width:100%}
.iso svg{display:block;width:100%;height:auto;filter:drop-shadow(0 40px 50px color-mix(in srgb,var(--accent) 35%,transparent))}
.float{position:absolute;display:flex;align-items:center;gap:8px;background:var(--surface);border:1px solid var(--line);padding:8px 14px;border-radius:999px;font-size:13px;font-weight:700;box-shadow:0 14px 30px -14px rgba(11,18,48,.35);animation:bob 5s ease-in-out infinite;white-space:nowrap}
.float::before{content:"";width:8px;height:8px;border-radius:50%;background:var(--c,var(--accent))}
.float:nth-of-type(2){animation-delay:-1.2s}.float:nth-of-type(3){animation-delay:-2.4s}.float:nth-of-type(4){animation-delay:-3.6s}
@keyframes bob{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}
@media (max-width:520px){.float{font-size:12px;padding:6px 10px}}

/* stats strip */
.stats{position:relative;z-index:2;margin-top:-84px;padding:0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);box-shadow:var(--shadow)}
.stat{padding:32px 28px;border-right:1px solid var(--line)}
.stat:last-child{border-right:0}
.stat b{display:block;font-size:clamp(28px,3.4vw,40px);font-weight:900;letter-spacing:-.03em;line-height:1.1;background:linear-gradient(90deg,var(--accent),var(--accent2));-webkit-background-clip:text;background-clip:text;color:transparent}
.stat span{font-size:14px;color:var(--muted)}
@media (max-width:760px){.stats-grid{grid-template-columns:1fr 1fr}.stat:nth-child(2){border-right:0}.stat:nth-child(-n+2){border-bottom:1px solid var(--line)}.stat{padding:22px 20px}}

/* dark band (services + why) */
.band{background:linear-gradient(160deg,var(--band1),var(--band2));color:#EAF0FF;position:relative;overflow:hidden}
.band::before{content:"";position:absolute;width:700px;height:700px;right:-240px;top:-240px;border-radius:50%;background:radial-gradient(closest-side,rgba(0,184,255,.22),transparent);pointer-events:none}
.band .wrap{position:relative}
.band h2{background:linear-gradient(90deg,#fff,#9FB6FF 60%,#7FDBFF);-webkit-background-clip:text;background-clip:text;color:transparent}
.band .lead{color:rgba(234,240,255,.72)}
.svc-grid{display:grid;grid-template-columns:repeat(12,1fr);gap:20px;margin-top:56px}
.svc-card{grid-column:span 3;display:flex;flex-direction:column;background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:var(--radius-lg);padding:28px;transition:transform .25s,border-color .25s,background .25s}
.svc-card:nth-child(-n+3){grid-column:span 4}
.svc-card:hover{transform:translateY(-4px);border-color:rgba(0,184,255,.6);background:rgba(255,255,255,.08)}
.svc-card .num{font-size:14px;font-weight:800;color:#7FDBFF;letter-spacing:.08em;margin-bottom:18px}
.svc-card h3{font-size:22px;font-weight:800;margin-bottom:10px}
.svc-card p{font-size:15px;color:rgba(234,240,255,.72);flex:1}
.svc-card .tags{margin-top:16px}
.svc-card .tags span{background:rgba(255,255,255,.1);color:#EAF0FF}
.svc-card .price{margin-top:22px;padding-top:18px;border-top:1px solid rgba(255,255,255,.12);text-align:left;font-size:18px;font-weight:800}
.svc-card .price small{color:rgba(234,240,255,.6);font-size:13px;font-weight:400}
@media (max-width:1000px){.svc-card,.svc-card:nth-child(-n+3){grid-column:span 6}.svc-card:last-child{grid-column:span 12}}
@media (max-width:640px){.svc-card,.svc-card:nth-child(-n+3),.svc-card:last-child{grid-column:span 12}}
.tags{display:flex;flex-wrap:wrap;gap:8px}
.tags span{font-size:13px;background:var(--soft);color:var(--ink);padding:3px 10px;border-radius:6px}
.price small{display:block}

/* case cards */
.filters{display:flex;flex-wrap:wrap;gap:10px;margin-top:36px}
.chip{font:inherit;font-size:15px;font-weight:700;color:var(--muted);background:var(--surface);border:1px solid var(--line);padding:8px 18px;border-radius:999px;cursor:pointer;transition:color .2s,border-color .2s,background .2s}
.chip:hover{color:var(--ink);border-color:var(--ink)}
.chip.on{color:#fff;border-color:transparent;background:linear-gradient(135deg,var(--accent),var(--accent3))}
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:32px}
.case{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);overflow:hidden;transition:transform .25s,box-shadow .25s}
.case:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.case[hidden]{display:none}
.case-vis{height:250px;padding:22px;display:flex;align-items:center;justify-content:center;background:linear-gradient(145deg,var(--soft),color-mix(in srgb,var(--accent3) 14%,var(--bg)));border-bottom:1px solid var(--line);overflow:hidden}
.case-body{padding:24px 26px 28px;display:flex;flex-direction:column;flex:1}
.case-meta{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.case-meta .cat{font-size:13px;font-weight:700;color:var(--accent)}
.case-meta .demo{font-size:11px;font-weight:800;letter-spacing:.06em;color:var(--muted);border:1px solid var(--line);padding:1px 8px;border-radius:999px}
.case h3{font-size:20px;font-weight:800;margin-bottom:8px}
.case p{color:var(--muted);font-size:15px;flex:1}
.case .tags{margin-top:16px}
.case-cta{margin-top:56px;padding:32px 36px;border-radius:var(--radius-lg);background:linear-gradient(160deg,var(--band1),var(--band2));display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}
.case-cta p{color:#EAF0FF;font-size:19px;font-weight:700;margin:0}
@media (max-width:1000px){.case-grid{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.case-grid{grid-template-columns:1fr}.case-vis{height:230px}.case-cta{padding:26px 24px}}


/* case details */
.case-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:18px;padding-top:16px;border-top:1px solid var(--line)}
.case-open{font:inherit;font-size:15px;font-weight:800;color:var(--accent);background:none;border:0;padding:0;cursor:pointer}
.case-open:hover{text-decoration:underline}
.case-demo{font-size:14px;font-weight:700;color:#fff;background:linear-gradient(135deg,var(--accent),var(--accent3));padding:6px 14px;border-radius:999px;text-decoration:none}
.case-demo[hidden],.dlg-demo[hidden]{display:none}
.case-dlg{width:min(680px,calc(100vw - 32px));max-height:calc(100vh - 48px);border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);color:var(--ink);padding:32px 34px;box-shadow:0 40px 90px -20px rgba(0,0,0,.5);overflow:auto;margin:auto}
.case-dlg::backdrop{background:rgba(5,8,24,.62);backdrop-filter:blur(3px)}
.dlg-x{position:absolute;top:14px;right:14px;width:34px;height:34px;border-radius:50%;border:1px solid var(--line);background:var(--bg);color:var(--muted);font-size:15px;cursor:pointer}
.dlg-x:hover{color:var(--ink);border-color:var(--ink)}
.dlg-head{margin-bottom:6px;padding-right:36px}
.dlg-head .cat{font-size:13px;font-weight:700;color:var(--accent)}
.dlg-head h3{font-size:24px;font-weight:900;margin-top:4px}
.case-dlg h4{font-size:13px;font-weight:800;letter-spacing:.06em;color:var(--muted);margin:22px 0 8px}
.case-dlg p{font-size:16px;color:var(--ink)}
.case-dlg ul{list-style:none;display:grid;gap:9px}
.case-dlg li{display:flex;gap:10px;font-size:15px;line-height:1.6}
.case-dlg li::before{content:"✓";flex:none;width:20px;height:20px;margin-top:2px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;font-size:12px;font-weight:800;display:flex;align-items:center;justify-content:center}
.dlg-act{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}
.dlg-act .btn{padding:11px 22px;font-size:15px}
body:has(dialog[open]){overflow:hidden}
@media (max-width:560px){.case-dlg{padding:26px 22px}}

/* shared skeleton line */
.ln{display:block;height:8px;border-radius:4px;background:var(--line)}
.w60{width:60%}.w40{width:40%}
.ln.lt{opacity:.6}

/* phone mock */
.phone{width:150px;height:100%;max-height:210px;background:var(--surface);border:1px solid var(--line);border-radius:22px;padding:12px 12px 0;display:flex;flex-direction:column;gap:9px;overflow:hidden;box-shadow:0 18px 36px -20px rgba(11,18,48,.4)}
.ph-top{display:flex;justify-content:space-between;align-items:center;font-size:12px}
.ph-top i{width:18px;height:18px;border-radius:50%;background:var(--soft)}
.ph-card{border-radius:12px;padding:10px 12px;color:#fff;background:linear-gradient(135deg,var(--accent),var(--accent3));font-size:11px}
.ph-card b{display:block;font-size:20px;line-height:1.2}
.ph-row{display:flex;align-items:center;gap:8px;font-size:11px}
.ph-row i{width:22px;height:22px;border-radius:7px;background:var(--soft);flex:none}
.ph-row .ln{flex:1;width:auto}
.ph-row em{font-style:normal;font-weight:800;color:var(--accent)}
.ph-tabs{margin-top:auto;display:flex;justify-content:space-around;padding:9px 0;border-top:1px solid var(--line)}
.ph-tabs i{width:14px;height:14px;border-radius:5px;background:var(--line)}
.ph-tabs i.on{background:var(--accent)}

/* ledger mock */
.led{width:100%;max-width:290px;background:var(--surface);border:1px solid var(--line);border-radius:16px;padding:12px;display:grid;gap:10px}
.led-bal{border-radius:12px;padding:12px 14px;color:#fff;background:linear-gradient(135deg,var(--accent),var(--accent3));font-size:12px}
.led-bal b{display:block;font-size:24px;line-height:1.2}
.led-row{display:flex;align-items:center;gap:10px;font-size:12px}
.led-row i{width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-style:normal;font-weight:800;flex:none}
.led-row .ln{flex:1;width:auto}
.led-row em{font-style:normal;font-weight:800}
.led-row.in i{background:#DCFCE7;color:#16A34A}.led-row.in em{color:#16A34A}
.led-row.out i{background:#FEE2E2;color:#DC2626}.led-row.out em{color:#DC2626}

/* DNS mock */
.dns{width:100%;max-width:300px;background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden;font-size:12px}
.dns-hd{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:var(--bg);border-bottom:1px solid var(--line)}
.dns-hd em{font-style:normal;font-size:11px;font-weight:800;color:#16A34A;background:#DCFCE7;padding:1px 8px;border-radius:999px}
.dns-row{display:grid;grid-template-columns:50px 36px 1fr 22px;gap:8px;align-items:center;padding:9px 14px;border-bottom:1px solid var(--line)}
.dns-row:last-child{border-bottom:0}
.dns-row .t{font-weight:800;color:var(--accent);font-size:11px}
.dns-row .v{color:var(--muted);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.dns-row i{width:20px;height:12px;border-radius:999px;background:var(--line);position:relative}
.dns-row i::after{content:"";position:absolute;top:2px;left:2px;width:8px;height:8px;border-radius:50%;background:#fff;transition:left .2s}
.dns-row i.on{background:#F6821F}
.dns-row i.on::after{left:10px}

/* aggregate mock */
.agg{width:100%;max-width:300px;background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:12px 14px;display:grid;gap:10px;font-size:12px}
.agg-hd{display:flex;justify-content:space-between;color:var(--muted)}
.agg-hd b{color:var(--ink)}.agg-hd em{font-style:normal}
.agg-row{display:grid;grid-template-columns:48px 1fr 46px;gap:10px;align-items:center;padding:8px 10px;background:var(--bg);border-radius:10px}
.agg-row span{text-align:right;font-weight:800}
.mini{height:26px;display:flex;align-items:flex-end;gap:4px}
.mini i{flex:1;border-radius:3px 3px 0 0;background:linear-gradient(180deg,var(--accent2),var(--accent))}

/* dark-gold app mock */
.phone.dk{background:#121826;border-color:#2A3348;color:#F2F4F8}
.phone.dk .ph-top i{background:#212A3D}
.phone.dk .ph-card{background:linear-gradient(135deg,#F0D08E,#C9964E);color:#3A2A12}
.phone.dk .ph-row i{background:#212A3D}
.phone.dk .ln{background:#2A3348}
.phone.dk .ph-row em{color:#E8C27A}
.phone.dk .ph-tabs{border-color:#2A3348}
.phone.dk .ph-tabs i{background:#2A3348}
.phone.dk .ph-tabs i.on{background:#E8C27A}
.gold-sw{display:grid;gap:8px;margin-left:16px}
.gold-sw i{width:34px;height:34px;border-radius:10px;border:1px solid var(--line)}

/* telegram chat mock */
.tg{width:100%;max-width:340px;background:var(--surface);border-radius:20px;overflow:hidden;border:1px solid var(--line);font-size:14px}
.tg-bar{display:flex;align-items:center;gap:10px;padding:12px 16px;background:linear-gradient(135deg,var(--accent),var(--accent3));color:#fff;font-weight:700}
.tg-bar i{width:30px;height:30px;border-radius:50%;background:rgba(255,255,255,.28);flex:none}
.tg-body{padding:16px;display:grid;gap:10px;background:var(--bg)}
.msg{max-width:84%;padding:9px 13px;border-radius:14px;line-height:1.5;white-space:pre-line}
.msg.me{justify-self:end;background:var(--accent);color:var(--accent-ink);border-bottom-right-radius:4px}
.msg.bot{background:var(--surface);border:1px solid var(--line);border-bottom-left-radius:4px}
.kb{display:grid;grid-template-columns:1fr 1fr;gap:8px;max-width:84%}
.kb span{text-align:center;background:var(--soft);color:var(--accent);font-weight:700;padding:7px;border-radius:10px;font-size:13px}

/* terminal mock */
.term{width:100%;max-width:460px;background:#0A0F24;color:#D5DEFF;border-radius:16px;overflow:hidden;border:1px solid rgba(255,255,255,.1);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:13px}
.term-bar{display:flex;gap:7px;padding:12px 16px;background:#121938}
.term-bar span{width:11px;height:11px;border-radius:50%;background:#35406E}
.term-body{padding:18px 20px;display:grid;gap:6px}
.term .p{color:#7FDBFF}.term .ok{color:#4ADE80}.term .dim{color:#7B88B8}
.pipe{display:flex;gap:8px;padding:0 20px 20px;flex-wrap:wrap}
.pipe span{font-size:12px;padding:4px 12px;border-radius:999px;background:rgba(74,222,128,.14);color:#4ADE80;font-weight:700}

/* dashboard mock */
.dashm{width:100%;max-width:460px;display:grid;grid-template-columns:62px 1fr;gap:12px;background:var(--surface);border:1px solid var(--line);border-radius:18px;padding:14px}
.dashm .side{background:linear-gradient(180deg,var(--accent),var(--accent3));border-radius:12px}
.dashm .main{display:grid;gap:12px}
.dashm .kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.dashm .kpis div{background:var(--bg);border-radius:10px;padding:10px;font-size:11px;color:var(--muted)}
.dashm .kpis b{display:block;font-size:19px;color:var(--ink);line-height:1.2}
.dashm .chart{background:var(--bg);border-radius:12px;height:150px;display:flex;align-items:flex-end;gap:8px;padding:14px}
.dashm .chart i{flex:1;border-radius:5px 5px 0 0;background:linear-gradient(180deg,var(--accent2),var(--accent))}

/* mocks inside case cards */
.case-vis .tg{max-width:250px;font-size:13px}
.case-vis .tg-body{padding:12px;gap:8px}
.case-vis .term{max-width:300px;font-size:12px}
.case-vis .term-body{padding:12px 16px;gap:4px}
.case-vis .pipe{padding:0 16px 14px}
.case-vis .dashm{max-width:300px;grid-template-columns:40px 1fr;padding:10px;gap:10px}
.case-vis .dashm .chart{height:84px;padding:10px;gap:6px}
.case-vis .dashm .kpis b{font-size:15px}

/* who */
.who-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:48px}
.who{padding:28px;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);transition:transform .2s,box-shadow .2s}
.who:hover{transform:translateY(-3px);box-shadow:var(--shadow)}
.who h3{font-size:19px;font-weight:800;margin-bottom:8px}
.who p{font-size:15px;color:var(--muted)}
@media (max-width:900px){.who-grid{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.who-grid{grid-template-columns:1fr}}

/* process */
.steps{display:grid;grid-template-columns:repeat(5,1fr);gap:20px;margin-top:56px;counter-reset:s;list-style:none}
.steps li{position:relative;padding-top:24px;border-top:2px solid var(--line)}
.steps li::before{counter-increment:s;content:counter(s);position:absolute;top:-20px;left:0;width:40px;height:40px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent3));color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center;font-size:16px}
.steps h3{font-size:18px;font-weight:800;margin:8px 0 6px}
.steps p{font-size:14px;color:var(--muted)}
@media (max-width:900px){.steps{grid-template-columns:1fr 1fr;row-gap:44px}}
@media (max-width:520px){.steps{grid-template-columns:1fr}}

/* why (dark band) */
.why-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:56px}
.why-grid>div{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12);border-radius:var(--radius-lg);padding:30px}
.why-grid h3{font-size:22px;margin-bottom:8px;display:flex;gap:12px;align-items:center}
.why-grid h3::before{content:"";width:12px;height:12px;background:linear-gradient(135deg,var(--accent2),var(--accent3));border-radius:3px;flex:none}
.why-grid p{color:rgba(234,240,255,.72);font-size:16px}
@media (max-width:700px){.why-grid{grid-template-columns:1fr}}

/* faq */
.faq{max-width:820px;margin-top:40px}
details{border-bottom:1px solid var(--line);padding:22px 0}
summary{font-weight:700;cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:16px;font-size:18px}
summary::-webkit-details-marker{display:none}
summary::after{content:"+";color:var(--accent);font-size:26px;line-height:1;transition:transform .2s}
details[open] summary::after{transform:rotate(45deg)}
details p{color:var(--muted);margin-top:12px;font-size:16px}

/* contact */
.contact{padding-top:40px}
.panel{background:linear-gradient(135deg,var(--accent),var(--accent3));color:#fff;border-radius:32px;padding:64px clamp(24px,5vw,72px);display:grid;grid-template-columns:.85fr 1.25fr;gap:48px;align-items:center;position:relative;overflow:hidden}
.panel::after{content:"";position:absolute;width:420px;height:420px;right:-120px;top:-160px;border-radius:50%;background:radial-gradient(closest-side,rgba(255,255,255,.28),transparent)}
.panel>*{position:relative;z-index:1}
.panel h2{font-size:clamp(30px,4vw,46px)}
.panel p{opacity:.88;margin-top:8px;font-size:18px}
.ways{display:grid;gap:12px}
.way{display:flex;justify-content:space-between;align-items:center;gap:12px;background:rgba(255,255,255,.16);border:1px solid rgba(255,255,255,.2);border-radius:14px;padding:14px 18px}
.way span{font-size:13px;opacity:.8;display:block}
.way b{font-size:16px;overflow-wrap:anywhere}
.way-info>div{min-width:0}
.way-info{display:flex;align-items:center;gap:14px;min-width:0}
.ico{flex:none;width:42px;height:42px;border-radius:12px;display:flex;align-items:center;justify-content:center}
.ico svg{width:24px;height:24px;display:block}
.way-btns{display:flex;gap:8px;flex:none}
.way-go{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.7);border-radius:999px;padding:6px 14px;font-size:13px;font-weight:700;text-decoration:none}
.way-go:hover{background:rgba(255,255,255,.18)}
.way button{background:#fff;color:#2457FF;border:0;border-radius:999px;padding:7px 14px;font:inherit;font-size:13px;font-weight:700;cursor:pointer;flex:none}
@media (max-width:820px){.panel{grid-template-columns:1fr}}
@media (max-width:560px){.way{flex-wrap:wrap}.way-info{flex:1 1 100%}.way-btns{margin-left:56px}.way button{margin-left:56px}.way-btns button{margin-left:0}}

/* brief form */
.brief-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:64px;align-items:start}
@media (max-width:860px){.brief-grid{grid-template-columns:1fr;gap:28px}}
.brief-notes{margin-top:20px;padding-left:1.2em;color:var(--muted);font-size:15px;display:grid;gap:6px}
.brief{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius-lg);padding:32px;display:grid;gap:18px;box-shadow:var(--shadow)}
.brief fieldset{border:0}
.brief legend,.field>span{font-size:14px;font-weight:700;margin-bottom:8px;display:block}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chips label{cursor:pointer}
.chips input{position:absolute;opacity:0;pointer-events:none}
.chips span{display:inline-block;padding:7px 14px;border:1px solid var(--line);border-radius:999px;font-size:14px;color:var(--muted);background:var(--bg)}
.chips input:checked+span{background:var(--accent);border-color:var(--accent);color:var(--accent-ink)}
.chips input:focus-visible+span{outline:3px solid var(--accent);outline-offset:2px}
.field{display:block}
.field input,.field textarea,.field select{width:100%;font:inherit;font-size:15px;color:var(--ink);background:var(--bg);border:1px solid var(--line);border-radius:var(--radius-sm);padding:11px 13px}
.field textarea{resize:vertical;min-height:110px}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--soft)}
.field .bad{border-color:#E5484D}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media (max-width:520px){.row2{grid-template-columns:1fr}}
.form-msg{font-size:14px;min-height:1em}
.form-msg.err{color:#E5484D}
.form-msg.sending{color:var(--muted)}
.form-msg.sending::before{content:"";display:inline-block;width:12px;height:12px;margin-right:8px;border:2px solid var(--line);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite;vertical-align:-2px}
@keyframes spin{to{transform:rotate(360deg)}}
.btn:disabled{opacity:.6;cursor:wait;transform:none}
.form-msg.ok{color:var(--ink);background:var(--soft);padding:12px 14px;border-radius:var(--radius-sm)}
.brief .btn{justify-self:start}
.consent{font-size:13px;color:var(--muted)}
.hp{position:absolute;left:-9999px;width:1px;height:1px;opacity:0}

/* floating action button */
.fab{position:fixed;right:20px;bottom:20px;z-index:30;padding:13px 22px;border-radius:999px;font-weight:800;font-size:15px;text-decoration:none;color:#fff;background:linear-gradient(135deg,var(--accent),var(--accent3));box-shadow:0 14px 34px -10px var(--accent)}
.fab:hover{transform:translateY(-2px)}

/* footer */
footer{padding:56px 0;color:var(--muted);font-size:14px}
footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}
footer a{text-decoration:none}
footer a:hover{color:var(--ink)}
.theme-btn{background:none;border:1px solid var(--line);color:var(--muted);border-radius:999px;padding:4px 12px;font:inherit;font-size:13px;cursor:pointer}
.foot-co{font-size:13px;margin-top:6px;line-height:1.6}
.foot-right{display:flex;gap:16px;align-items:center;flex-wrap:wrap}

/* legal pages */
.legal{max-width:720px;margin:0 auto;padding:64px 24px}
.legal h1{font-size:36px;margin-bottom:8px}
.legal h2{font-size:20px;margin:28px 0 8px}
.legal p,.legal li{color:var(--muted);font-size:15px}
.legal ul{padding-left:1.3em;display:grid;gap:4px}
.legal .note{background:var(--soft);color:var(--ink);padding:12px 14px;border-radius:var(--radius-sm);margin:16px 0}

/* guestbook */
.guest{max-width:760px;margin:0 auto;padding:64px 24px 96px}
.guest h1{font-size:clamp(30px,4.6vw,44px);font-weight:900;margin-bottom:12px}
.g-form{margin-top:32px;padding:24px;border:1px solid var(--line);border-radius:var(--radius-lg);background:var(--surface);display:grid;gap:16px;box-shadow:var(--shadow)}
.g-row{display:flex;align-items:center;justify-content:space-between;gap:12px}
.g-count{font-size:13px;color:var(--muted)}
.g-hint{font-size:13px;color:var(--muted)}
.g-list{margin-top:36px;display:grid;gap:14px}
.g-item{display:flex;gap:14px;padding:18px 20px;border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface)}
.g-av{flex:none;width:40px;height:40px;border-radius:50%;color:#fff;font-weight:800;display:flex;align-items:center;justify-content:center}
.g-body{min-width:0;flex:1}
.g-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:4px 12px;margin-bottom:4px}
.g-head time{font-size:13px;color:var(--muted)}
.g-body p{white-space:pre-wrap;overflow-wrap:anywhere;font-size:16px}
.g-empty{margin-top:36px;text-align:center;color:var(--muted)}
.g-more{display:flex;margin:24px auto 0}
.g-more[hidden],.g-empty[hidden]{display:none}

/* 验证题 */
.captcha[hidden]{display:none}
.cap-row{display:flex;align-items:center;gap:10px}
.cap-q{font-size:20px;font-variant-numeric:tabular-nums;min-width:96px;letter-spacing:.02em}
.cap-row input{width:110px}
.cap-refresh{width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:var(--bg);color:var(--muted);font-size:18px;cursor:pointer}
.cap-refresh:hover{color:var(--ink);border-color:var(--ink)}