:root{
  --primary:#245D68; --primary-hover:#194B55;
  --ink:#162A30; --muted:#53666D;
  --canvas:#F7F9F8; --surface:#FFFFFF; --soft:#EAF2F1; --border:#D5E0E0;
  --warm:#F4EFEC;
  --ok:#246047; --ok-bg:#E9F3ED; --err:#A22D35; --err-bg:#F9ECEE;
  --tbd:#80621C; --tbd-bg:#faf3dd; --tbd-line:#e8d9a8;
  --navy:#34487a; --paper:#fdfbf7; --mauve:#ab847f; --cream:#fbf6ec;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:Inter,"PingFang SC","Noto Sans SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,BlinkMacSystemFont,sans-serif;font-size:18px;line-height:1.7;color:var(--ink);background:var(--surface)}
a{color:var(--primary);text-decoration:none}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}


.topbar{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.95);backdrop-filter:blur(8px);border-bottom:1px solid var(--border)}
.topbar .wrap{display:flex;align-items:center;justify-content:space-between;height:80px}
.wordmark{font-size:22px;font-weight:700;color:var(--ink);letter-spacing:.5px}
.wordmark span{color:var(--primary)}
.nav{display:flex;gap:26px;font-size:15px;align-items:center}
.nav a{color:var(--muted);padding:8px 2px}
.nav a:hover{color:var(--primary)}
.nav a.active{color:var(--primary);font-weight:600;border-bottom:2px solid var(--primary)}
.nav .lang{border:1px solid var(--border);border-radius:12px;padding:6px 14px;font-size:14px;color:var(--ink)}
.nav .lang:hover{border-color:var(--primary);color:var(--primary)}
.nav .btn-nav{background:var(--primary);color:#fff;border-radius:12px;padding:9px 18px;font-weight:600}
.nav .btn-nav:hover{background:var(--primary-hover);color:#fff}
.burger{display:none;background:none;border:1px solid var(--border);border-radius:12px;width:44px;height:44px;font-size:18px;color:var(--ink);cursor:pointer}
.mobile-menu{display:none;border-bottom:1px solid var(--border);background:#fff;padding:12px 24px 20px}
.mobile-menu.open{display:block}
.mobile-menu a{display:block;padding:12px 0;font-size:16px;color:var(--ink);border-bottom:1px dashed var(--border);min-height:44px}
.mobile-menu a:last-child{border-bottom:none}
@media(max-width:900px){.topbar .wrap{height:64px}.nav{display:none}.burger{display:block}}


.s-head{padding:96px 0;border-bottom:1px solid var(--border)}
.s-head .kicker{display:inline-block;font-size:13px;font-weight:600;letter-spacing:2px;color:var(--primary);border:1px solid var(--primary);border-radius:999px;padding:4px 16px;margin-bottom:28px}
.s-head h1{font-size:52px;line-height:1.3;font-weight:700;color:var(--ink);max-width:820px}
html[lang=en] .s-head h1{font-size:56px;line-height:1.14}
.s-head .sub{margin-top:24px;font-size:18px;color:var(--muted);max-width:720px}
.s-head .cta{margin-top:36px;display:flex;gap:14px;flex-wrap:wrap}
.s-head-grid,.hero-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:48px;align-items:center}
.hero-grid>div{min-width:0}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr;gap:32px}.hero-visual-m{order:2}}
@media(max-width:900px){.s-head{padding:56px 0}.s-head h1,html[lang=en] .s-head h1{font-size:32px;line-height:1.35}.s-head-grid{grid-template-columns:1fr;gap:32px}.s-head-visual-m{order:2}}

.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:12px 28px;border-radius:12px;font-size:16px;font-weight:600;cursor:pointer;border:1px solid transparent;font-family:inherit}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-hover)}
.btn-ghost{border-color:var(--border);color:var(--ink);background:#fff}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}


.relvis{background:var(--canvas);border:1px solid var(--border);border-radius:20px;padding:24px}
.relvis canvas{width:100%;height:auto;display:block}
.relvis .alt{margin-top:12px;font-size:12.5px;color:var(--muted);border-top:1px dashed var(--border);padding-top:10px}
.relvis .sim{display:inline-block;font-size:12px;font-weight:600;color:var(--tbd);background:var(--tbd-bg);border:1px solid var(--tbd-line);border-radius:999px;padding:1px 10px;margin-bottom:10px}


section{padding:96px 0}
.sec-soft{background:var(--canvas);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.sec-warm{background:var(--warm);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.sec-head{margin-bottom:48px}
.sec-head .q{font-size:13px;font-weight:600;letter-spacing:2px;color:var(--primary);margin-bottom:10px}
.sec-head h2{font-size:36px;font-weight:700;color:var(--ink);line-height:1.4;max-width:860px}
.sec-head p{margin-top:14px;color:var(--muted);max-width:760px}
@media(max-width:900px){section{padding:56px 0}.sec-head{margin-bottom:32px}.sec-head h2{font-size:26px}}

.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:28px}
@media(max-width:900px){.grid3,.grid4,.grid2{grid-template-columns:1fr}}
.card{background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:28px 24px}
.card .who{font-size:12px;font-weight:600;letter-spacing:1px;color:var(--primary);margin-bottom:8px}
.card h3{font-size:19px;font-weight:600;color:var(--ink);margin-bottom:8px}
.card p{font-size:15px;color:var(--muted)}
.card .num{font-size:13px;font-weight:700;color:var(--primary);letter-spacing:1px;margin-bottom:8px}
.note-line{margin-top:20px;font-size:13px;color:var(--muted)}


.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;counter-reset:step}
@media(max-width:900px){.steps{grid-template-columns:1fr}}
.step{background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:24px;position:relative}
.step .no{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:50%;background:var(--soft);color:var(--primary);font-weight:700;font-size:15px;margin-bottom:14px}
.step h3{font-size:17px;font-weight:600;margin-bottom:6px}
.step p{font-size:14px;color:var(--muted)}
.step .io{margin-top:12px;font-size:12.5px;color:var(--muted);border-top:1px dashed var(--border);padding-top:10px}


.project{background:var(--surface);border:1px solid var(--border);border-radius:20px;padding:44px 40px;display:grid;grid-template-columns:1.25fr 1fr;gap:36px}
.project>div{min-width:0}
@media(max-width:900px){.project{grid-template-columns:1fr;padding:32px 24px}}
.project .badge{display:inline-block;font-size:12px;letter-spacing:1.5px;color:var(--primary);border:1px solid var(--primary);border-radius:999px;padding:3px 14px;margin-bottom:18px}
.project h3{font-size:28px;font-weight:700;color:var(--ink);margin-bottom:6px}
.project .sub2{font-size:16px;color:var(--muted);margin-bottom:16px}
.project p{font-size:15.5px;color:var(--muted);margin-bottom:14px}
.project .credit{margin-top:24px;padding-top:20px;border-top:1px solid var(--border);font-size:14.5px;color:var(--ink)}
.project .credit strong{color:var(--primary);font-weight:600}
.boundary{margin-top:16px;font-size:13px;color:var(--muted);background:var(--canvas);border:1px solid var(--border);border-radius:12px;padding:10px 14px}
.placeholder{background:var(--canvas);border:2px dashed var(--border);border-radius:20px;min-height:280px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:var(--muted);font-size:14px;text-align:center;padding:20px}
.placeholder .tag{font-size:12px;font-weight:600;color:var(--tbd);background:var(--tbd-bg);border:1px solid var(--tbd-line);border-radius:999px;padding:2px 12px}
.feat{list-style:none;margin-top:8px}
.feat li{font-size:14.5px;color:var(--muted);padding:9px 0;border-bottom:1px dashed var(--border);display:flex;justify-content:space-between;gap:12px}
.feat li:last-child{border-bottom:none}
.feat .st{font-size:12px;color:var(--tbd);background:var(--tbd-bg);border-radius:999px;padding:1px 10px;white-space:normal;max-width:55%;height:fit-content}


.form-wrap{max-width:680px}
.proto-badge{display:inline-block;font-size:12px;font-weight:600;color:var(--tbd);background:var(--tbd-bg);border:1px solid var(--tbd-line);border-radius:999px;padding:3px 12px;margin-bottom:20px}
.field{margin-bottom:20px}
.field label{display:block;font-size:15px;font-weight:600;color:var(--ink);margin-bottom:6px}
.field .req{color:var(--err)}
.field .opt{font-weight:400;color:var(--muted);font-size:13px}
.field input,.field textarea,.field select{width:100%;border:1px solid var(--border);border-radius:12px;padding:12px 14px;font-size:16px;font-family:inherit;color:var(--ink);background:#fff;min-height:48px}
.field textarea{min-height:110px;resize:vertical}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--primary)}
.field.err input,.field.err textarea{border-color:var(--err)}
.field .msg{display:none;font-size:13px;color:var(--err);margin-top:5px}
.field.err .msg{display:block}
.form-state{margin-top:18px;font-size:15px;border-radius:12px;padding:13px 16px;display:none}
.form-state.show{display:block}
.form-state.submitting{background:var(--canvas);color:var(--muted);border:1px solid var(--border)}
.form-state.success{background:var(--ok-bg);color:var(--ok);border:1px solid #c8e2d2}
.form-state.failure{background:var(--err-bg);color:var(--err);border:1px solid #eccfd2}
.state-preview{margin-top:26px;padding-top:18px;border-top:1px dashed var(--border);font-size:12.5px;color:var(--muted)}
.state-preview button{font-size:12px;border:1px solid var(--border);background:#fff;border-radius:999px;padding:4px 14px;margin:4px 0 0 6px;cursor:pointer;color:var(--muted);min-height:32px}
.state-preview button:hover{border-color:var(--primary);color:var(--primary)}
.privacy-link{font-size:13px;color:var(--muted);margin-top:14px}


.draft-banner{background:var(--tbd-bg);border:1px solid var(--tbd-line);border-radius:12px;padding:14px 18px;font-size:14px;color:var(--tbd);font-weight:600;margin-bottom:28px}
.policy h3{font-size:18px;font-weight:600;color:var(--ink);margin:26px 0 8px}
.policy p{font-size:15px;color:var(--muted)}
.tbd{display:inline-block;font-size:12px;font-weight:600;color:var(--tbd);background:var(--tbd-bg);border:1px solid var(--tbd-line);border-radius:999px;padding:1px 10px;margin-left:8px;vertical-align:middle;white-space:normal;max-width:calc(100% - 8px)}


.internal{background:var(--cream);border-top:1px solid var(--border);padding:64px 0}
.internal .sec-head .q{color:var(--mauve)}
.internal .sec-head h2{font-size:24px}
.ledger{background:var(--paper);border:1px solid var(--border);border-radius:12px;padding:22px;font-size:13px}
.ledger li{margin-bottom:8px;list-style:none;color:var(--muted);word-break:break-all}
.ledger code{color:var(--navy);font-size:12px}
.ledger h4{font-size:14px;font-weight:600;color:var(--navy);margin:14px 0 8px}
.ledger .note{font-size:12.5px;color:var(--mauve);margin-top:10px}


.footer{background:#162A30;color:#b9c6cb;padding:64px 0 40px}
.footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px}
@media(max-width:900px){.footer .cols{grid-template-columns:1fr}}
.footer h4{font-size:14px;font-weight:600;color:#fff;margin-bottom:12px;letter-spacing:1px}
.footer p,.footer a{font-size:14px;color:#9fb0b6}
.footer a:hover{color:#fff}
.footer .brand{font-size:22px;font-weight:700;color:#fff;margin-bottom:10px}
.footer .entity{font-size:12.5px;color:#8fa0a6;margin-top:10px}
.footer .bottom{margin-top:44px;padding-top:20px;border-top:1px solid rgba(255,255,255,.12);font-size:12px;color:#7e9097;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

@media(max-width:430px){body{font-size:16px;line-height:1.65}.wrap{padding:0 20px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}


.field input,.field textarea,.field select,.burger,.nav .lang{border-color:var(--muted)}
.state-preview button{min-height:44px}
.footer .bottom{color:#9fb0b6}
.footer .bottom span{max-width:100%;overflow-wrap:anywhere}
a:focus-visible,button:focus-visible{outline:3px solid var(--primary);outline-offset:4px}
@media(max-width:900px){html[lang=en] .s-head h1{font-size:36px;line-height:44px}}