/* 印签 AI Sign — 共享设计系统（沿用 interstar 母品牌暗色太空风） */
:root{
  --bg:#07090f;
  --bg-2:#0b0e18;
  --panel:rgba(255,255,255,.03);
  --ink:#f2f5ff;
  --body:#aab2c9;
  --mut:#6d7692;
  --line:rgba(255,255,255,.09);
  --line-2:rgba(255,255,255,.17);
  --ind:#4f7cff;
  --vio:#7a5bff;
  --cyn:#35d0e0;
  --ok:#38e1a5;
  --warn:#ffb454;
  --err:#ff6b7a;
  --grad:linear-gradient(110deg,#4f7cff,#7a5bff 60%,#9b5bff);
  --grad-soft:linear-gradient(110deg,rgba(79,124,255,.16),rgba(122,91,255,.16));
  --shadow:0 24px 60px -28px rgba(0,0,0,.7);
  --r:20px;
  --max:1200px;
  --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
  --mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,monospace;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);
  line-height:1.75;letter-spacing:.004em;font-size:16px;-webkit-font-smoothing:antialiased;overflow-x:hidden;min-height:100vh;
}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{margin:0;letter-spacing:-.02em}
::selection{background:rgba(122,91,255,.4)}
.wrap{position:relative;z-index:1;max-width:var(--max);margin:0 auto;padding:0 clamp(20px,4vw,44px)}

/* backdrop */
.stars{position:fixed;inset:0;z-index:0;pointer-events:none}
.aurora{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.blob{position:absolute;border-radius:50%;filter:blur(80px);opacity:.5}
.blob.b1{width:560px;height:560px;top:-200px;right:-140px;background:radial-gradient(circle,rgba(79,124,255,.4),transparent 66%)}
.blob.b2{width:480px;height:480px;top:12%;left:-200px;background:radial-gradient(circle,rgba(122,91,255,.34),transparent 66%)}
.blob.b3{width:640px;height:640px;top:46%;left:55%;background:radial-gradient(circle,rgba(53,208,224,.16),transparent 66%)}

/* header */
header{
  position:sticky;top:0;z-index:50;background:rgba(7,9,15,.6);
  backdrop-filter:blur(16px) saturate(150%);-webkit-backdrop-filter:blur(16px) saturate(150%);border-bottom:1px solid transparent;
}
header.stuck{border-bottom-color:var(--line)}
.bar{display:flex;align-items:center;gap:14px;height:66px}
.logo{display:flex;align-items:center;gap:11px;font-size:15px;font-weight:650}
.mark{
  width:34px;height:34px;flex:0 0 auto;border-radius:11px;display:grid;place-items:center;color:#fff;
  background:var(--grad);box-shadow:0 10px 26px -8px rgba(79,124,255,.7);position:relative;
}
.mark::after{content:"";position:absolute;inset:-3px;border-radius:14px;border:1px solid rgba(255,255,255,.22)}
.logo b{font-weight:680}
.markimg{width:34px;height:34px;flex:0 0 auto;display:block;object-fit:contain}
.logo small{color:var(--mut);font-weight:500}
nav{margin-left:auto;display:flex;gap:26px;font-size:14px;color:var(--body);align-items:center}
nav a{position:relative;transition:color .2s}
nav a:hover{color:var(--ink)}
nav a::after{content:"";position:absolute;left:0;right:100%;bottom:-7px;height:2px;border-radius:2px;background:var(--grad);transition:right .25s}
nav a:hover::after{right:0}
.lang{display:flex;gap:2px;border:1px solid var(--line);border-radius:999px;padding:3px;background:var(--panel)}
.lang a{padding:5px 11px;border-radius:999px;font-size:12.5px;color:var(--body);transition:.2s}
.lang a.on{background:var(--grad);color:#fff}
@media(max-width:820px){nav{display:none}}

/* buttons */
.btn{
  display:inline-flex;align-items:center;gap:9px;padding:12px 24px;font-size:15px;font-weight:600;border-radius:999px;
  border:1px solid transparent;transition:transform .16s,box-shadow .2s,background .2s,border-color .2s;cursor:pointer;font-family:inherit;
}
.btn.primary{background:var(--grad);color:#fff;box-shadow:0 16px 36px -12px rgba(79,124,255,.6)}
.btn.primary:hover{transform:translateY(-2px);box-shadow:0 22px 48px -14px rgba(122,91,255,.65)}
.btn.ghost{color:var(--ink);border-color:var(--line-2);background:var(--panel)}
.btn.ghost:hover{border-color:rgba(255,255,255,.35);transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn.sm{padding:9px 18px;font-size:14px}
.btn.block{width:100%;justify-content:center}

/* sections */
section{padding:76px 0;position:relative}
.head{max-width:720px;margin-bottom:48px}
h2{font-size:clamp(26px,3.6vw,42px);line-height:1.18;font-weight:720}
.lead{margin:18px 0 0;color:var(--body);font-size:15.5px;line-height:1.9;max-width:60ch}
.pill{
  display:inline-flex;align-items:center;gap:8px;font-size:12.5px;font-weight:650;letter-spacing:.1em;text-transform:uppercase;
  color:#9fb4ff;background:var(--grad-soft);border:1px solid rgba(79,124,255,.2);border-radius:999px;padding:6px 14px;margin-bottom:18px;
}
.g{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* cards / tiles */
.grid{display:grid;gap:18px}
.g3{grid-template-columns:repeat(3,1fr)}
.g2{grid-template-columns:repeat(2,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:920px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.g3,.g2,.g4{grid-template-columns:1fr}}
.card{
  background:var(--panel);border:1px solid var(--line);border-radius:var(--r);padding:28px 26px;
  transition:transform .2s,border-color .25s,box-shadow .25s;position:relative;overflow:hidden;
}
.card:hover{transform:translateY(-4px);border-color:var(--line-2);box-shadow:var(--shadow)}
.card h3{margin:0 0 10px;font-size:17px;font-weight:680}
.card p{margin:0;color:var(--body);font-size:14px;line-height:1.85}
.card .tag{font-size:12px;letter-spacing:.1em;color:#9fb4ff;text-transform:uppercase}
.ptile{
  background:var(--panel);border:1px solid var(--line);border-radius:24px;padding:34px 30px;position:relative;overflow:hidden;
  transition:transform .22s,border-color .25s,box-shadow .25s;display:flex;flex-direction:column;gap:14px;
}
.ptile:hover{transform:translateY(-6px);border-color:var(--line-2);box-shadow:var(--shadow)}
.ptile::before{content:"";position:absolute;left:0;top:0;right:0;height:3px;background:var(--grad);opacity:.85}
.ptile .ic{width:52px;height:52px;border-radius:15px;background:var(--grad-soft);display:grid;place-items:center;font-size:24px}
.ptile h3{font-size:22px;font-weight:730}
.ptile p{color:var(--body);font-size:14.5px;line-height:1.85;margin:0}
.ic svg{width:26px;height:26px;display:block}
.shot{position:relative;border-radius:var(--r);overflow:hidden;border:1px solid var(--line);background:var(--panel);margin:0}
.shot img{width:100%;aspect-ratio:16/9;object-fit:cover;display:block;transition:transform .5s cubic-bezier(.16,1,.3,1)}
.shot:hover img{transform:scale(1.05)}
.shot figcaption{padding:14px 18px;font-size:13px;color:var(--body);line-height:1.6}
.shot figcaption b{display:block;color:var(--ink);font-size:15px;font-weight:680;margin-bottom:3px}

/* footer */
footer{border-top:1px solid var(--line);padding:48px 0 56px;margin-top:40px}
footer .desc{color:var(--body);font-size:14px;max-width:360px;line-height:1.85}
.brandrow{margin-top:28px;padding-top:22px;border-top:1px solid var(--line);display:flex;gap:16px;flex-wrap:wrap;justify-content:space-between;color:var(--mut);font-size:13px}
footer h5{margin:0 0 14px;font-size:13px;letter-spacing:.1em;text-transform:uppercase;color:var(--mut)}
footer a{display:block;color:var(--body);font-size:14px;padding:4px 0;transition:color .2s}
footer a:hover{color:var(--ink)}

/* ---- 表单 ---- */
.field{margin-bottom:18px;text-align:left}
.field label{display:block;font-size:13px;color:var(--body);margin-bottom:7px;font-weight:600}
.field .hint{font-size:12px;color:var(--mut);margin-top:5px}
.input,textarea.input,select.input{
  width:100%;background:rgba(255,255,255,.04);border:1px solid var(--line);border-radius:12px;padding:12px 14px;
  color:var(--ink);font-size:15px;font-family:inherit;transition:border-color .2s,background .2s,box-shadow .2s;
}
.input:focus{outline:none;border-color:var(--ind);background:rgba(255,255,255,.06);box-shadow:0 0 0 3px rgba(79,124,255,.14)}
textarea.input{resize:vertical;min-height:96px;line-height:1.7}
.input::placeholder{color:var(--mut)}
.auth{max-width:430px;margin:0 auto}
.auth .card{padding:36px 32px}
.auth h1{font-size:24px;font-weight:740}
.auth .alt{margin-top:20px;text-align:center;font-size:14px;color:var(--body)}
.auth .alt a{color:#9fb4ff;font-weight:600}

/* ---- 提示 / 状态 ---- */
.note{font-size:13.5px;line-height:1.7;border-radius:12px;padding:12px 14px;margin:14px 0}
.note.ok{color:#c9ffe8;background:rgba(56,225,165,.09);border:1px solid rgba(56,225,165,.28)}
.note.err{color:#ffd6db;background:rgba(255,107,122,.09);border:1px solid rgba(255,107,122,.28)}
.note.warn{color:#ffe6c2;background:rgba(255,180,84,.09);border:1px solid rgba(255,180,84,.28)}

/* ---- 代码 / 哈希 ---- */
.code{
  font-family:var(--mono);font-size:12.5px;color:#9fb4ff;background:rgba(79,124,255,.08);
  border:1px solid rgba(79,124,255,.16);border-radius:10px;padding:8px 12px;word-break:break-all;line-height:1.6;
}

/* ---- 工作台 ---- */
.dash-head{display:flex;align-items:flex-end;gap:20px;justify-content:space-between;flex-wrap:wrap;margin-bottom:32px}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:40px}
@media(max-width:640px){.stats{grid-template-columns:1fr}}
.stat{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:22px 24px}
.stat .n{font-size:34px;font-weight:780;letter-spacing:-.02em}
.stat .l{font-size:13px;color:var(--mut);margin-top:2px;letter-spacing:.04em}
.list{display:flex;flex-direction:column;gap:12px}
.row{
  display:flex;align-items:center;gap:16px;background:var(--panel);border:1px solid var(--line);
  border-radius:14px;padding:16px 18px;transition:border-color .2s;
}
.row:hover{border-color:var(--line-2)}
.row .ri{flex:1 1 auto;min-width:0}
.row .rt{font-weight:640;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.row .rm{font-size:12.5px;color:var(--mut);margin-top:3px;font-family:var(--mono);word-break:break-all}
.row .rs{flex:0 0 auto;font-size:12px;color:var(--mut)}
.row .btns{flex:0 0 auto;display:flex;gap:8px}
.chip{font-size:11.5px;padding:3px 10px;border-radius:999px;border:1px solid var(--line-2);color:var(--body);white-space:nowrap}
.chip.ok{color:#c9ffe8;border-color:rgba(56,225,165,.4);background:rgba(56,225,165,.08)}
.empty{padding:46px 24px;text-align:center;color:var(--mut);border:1px dashed var(--line-2);border-radius:16px;font-size:14px}
.empty a{color:#9fb4ff}

/* ---- 证书 ---- */
.cert{
  background:linear-gradient(160deg,rgba(79,124,255,.06),rgba(122,91,255,.05)),var(--panel);
  border:1px solid var(--line-2);border-radius:24px;padding:clamp(28px,4vw,56px);position:relative;overflow:hidden;
}
.cert::before{content:"";position:absolute;inset:0;background:radial-gradient(90% 60% at 50% 0%,rgba(79,124,255,.12),transparent 60%);pointer-events:none}
.cert .seal{
  width:74px;height:74px;border-radius:50%;margin:0 auto 22px;background:var(--grad);display:grid;place-items:center;
  color:#fff;box-shadow:0 14px 40px -10px rgba(122,91,255,.7);position:relative;
}
.cert .seal::after{content:"";position:absolute;inset:-6px;border-radius:50%;border:1px solid rgba(255,255,255,.28)}
.cert .seal svg{width:34px;height:34px}
.cert h1{text-align:center;font-size:clamp(24px,3vw,34px)}
.cert .sub{text-align:center;color:var(--mut);font-size:13px;margin-top:6px}
.cert .kv{margin-top:30px;display:flex;flex-direction:column;gap:14px}
.cert .kvd{display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding-bottom:12px}
.cert .kvd .k{color:var(--mut);font-size:13px;white-space:nowrap}
.cert .kvd .v{font-size:14px;text-align:right;word-break:break-all}
@media print{
  body{background:#fff;color:#111}
  header,footer,.aurora,.stars,.no-print{display:none!important}
  .cert{background:#fff;border:1px solid #ddd}
  .cert .kvd .k,.cert .sub,.cert .kvd .v{color:#333}
}

/* reveal */
.rv{opacity:0;transform:translateY(18px);transition:opacity .7s cubic-bezier(.16,1,.3,1),transform .7s cubic-bezier(.16,1,.3,1)}
.rv.in{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){
  .rv{opacity:1;transform:none;transition:none}
  html{scroll-behavior:auto}
  .btn:hover,.card:hover,.ptile:hover{transform:none}
}

/* ---- RTL（阿拉伯语）---- */
[dir="rtl"] .bar{direction:rtl}
[dir="rtl"] nav{margin-right:auto;margin-left:0}
[dir="rtl"] .kvd .v{text-align:left}
[dir="rtl"] .kvd .k{text-align:right}
[dir="rtl"] body{letter-spacing:0}