/* ===== 海岸线信息科技 · 深色主题 ===== */
:root{
  --bg:#0a0f1c;
  --bg-2:#0e1626;
  --surface:#121d33;
  --surface-2:#16223c;
  --border:rgba(148,163,184,.14);
  --border-strong:rgba(148,163,184,.28);
  --text:#e8eef7;
  --muted:#94a3b8;
  --brand:#38bdf8;
  --brand-2:#2dd4bf;
  --brand-grad:linear-gradient(135deg,#38bdf8,#2dd4bf);
  --ok:#34d399;
  --warn:#fbbf24;
  --radius:14px;
  --maxw:1140px;
  --shadow:0 12px 34px rgba(0,0,0,.4);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--text);background:var(--bg);line-height:1.75;-webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{display:block}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 22px}
.brand-name::after,.org-name::after{content:attr(data-name)}

/* ===== Header ===== */
header{
  position:sticky;top:0;z-index:50;background:rgba(10,15,28,.82);
  backdrop-filter:saturate(180%) blur(12px);border-bottom:1px solid var(--border);
}
.nav{display:flex;align-items:center;justify-content:space-between;height:66px;gap:18px}
.logo{display:flex;align-items:center;gap:11px;font-weight:700;font-size:17px}
.logo img{width:36px;height:36px;border-radius:10px}
.nav-menu{display:flex;align-items:center;gap:6px;list-style:none}
.nav-menu a{
  color:var(--muted);font-size:15px;padding:8px 14px;border-radius:9px;transition:.2s;
}
.nav-menu a:hover{color:var(--text);background:var(--surface)}
.nav-menu a.active{color:var(--text);background:var(--surface-2);box-shadow:inset 0 0 0 1px var(--border-strong)}
.menu-btn{display:none;background:none;border:1px solid var(--border);border-radius:9px;width:40px;height:38px;
  font-size:20px;cursor:pointer;color:var(--text)}

/* ===== Hero ===== */
.hero{
  position:relative;overflow:hidden;padding:96px 0 80px;
  background:
    radial-gradient(900px 380px at 78% -12%,rgba(56,189,248,.18),transparent 60%),
    radial-gradient(700px 320px at 12% 8%,rgba(45,212,191,.14),transparent 55%),
    var(--bg-2);
  border-bottom:1px solid var(--border);
}
.hero .tag{display:inline-flex;align-items:center;gap:8px;color:var(--brand);background:rgba(56,189,248,.1);
  padding:6px 14px;border-radius:999px;font-size:13.5px;font-weight:600;margin-bottom:20px;border:1px solid rgba(56,189,248,.25)}
.hero h1{font-size:42px;line-height:1.22;letter-spacing:-.5px;max-width:780px}
.hero h1 .grad{background:var(--brand-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.lead{color:var(--muted);font-size:18px;max-width:720px;margin-top:18px}
.hero .cta{margin-top:32px;display:flex;gap:14px;flex-wrap:wrap}
.btn{padding:12px 22px;border-radius:10px;font-weight:600;font-size:15px;cursor:pointer;border:1px solid transparent;transition:.2s;display:inline-flex;align-items:center;gap:8px}
.btn-primary{background:var(--brand-grad);color:#04121f}
.btn-primary:hover{filter:brightness(1.08);transform:translateY(-1px)}
.btn-ghost{border-color:var(--border-strong);color:var(--text);background:var(--surface)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand)}

/* ===== Sections ===== */
section{padding:74px 0}
section.alt{background:var(--bg-2);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
.sec-head{margin-bottom:38px;max-width:760px}
.sec-head .kicker{color:var(--brand);font-weight:700;font-size:13px;letter-spacing:1.5px;text-transform:uppercase}
.sec-head h2{font-size:29px;margin-top:8px;letter-spacing:-.3px}
.sec-head p{color:var(--muted);margin-top:10px;font-size:16px}
.lead-text{color:var(--muted);font-size:17px;max-width:840px}

/* ===== Cards ===== */
.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);transition:.2s;position:relative;overflow:hidden}
.card:hover{transform:translateY(-3px);border-color:var(--border-strong)}
.card .ico{width:46px;height:46px;border-radius:12px;background:rgba(56,189,248,.12);color:var(--brand);
  display:grid;place-items:center;font-size:20px;font-weight:800;margin-bottom:14px;border:1px solid rgba(56,189,248,.2)}
.card h3{font-size:18px;margin-bottom:8px}
.card p{color:var(--muted);font-size:15px}
.card .meta{margin-top:14px;font-size:13px;color:var(--brand-2);font-weight:600}

/* ===== About ===== */
.about-grid{display:grid;grid-template-columns:1.4fr 1fr;gap:40px;align-items:start}
.stat-row{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:8px}
.stat{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:16px}
.stat .n{font-size:26px;font-weight:800;background:var(--brand-grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.stat .l{color:var(--muted);font-size:13px;margin-top:4px}

/* ===== API docs ===== */
.api-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}
.endpoint{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.ep-head{display:flex;align-items:center;gap:10px;margin-bottom:12px}
.method{font-size:12px;font-weight:800;padding:4px 10px;border-radius:7px;letter-spacing:.5px}
.m-get{background:rgba(52,211,153,.16);color:#34d399}
.m-post{background:rgba(56,189,248,.16);color:#38bdf8}
.m-delete{background:rgba(248,113,113,.16);color:#f87171}
.ep-path{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:14.5px;color:var(--text)}
.ep-desc{color:var(--muted);font-size:14.5px;margin-bottom:12px}
.code{background:#070c16;color:#dbeafe;border-radius:12px;padding:16px 18px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:13px;line-height:1.85;overflow:auto;border:1px solid var(--border)}
.code .c{color:#7dd3fc}
.code .s{color:#a7f3d0}
.code .m{color:#fca5a5}
.code .k{color:#fcd34d}
table.doc{width:100%;border-collapse:collapse;margin-top:10px;font-size:14px}
table.doc th,table.doc td{text-align:left;padding:10px 12px;border-bottom:1px solid var(--border)}
table.doc th{color:var(--muted);font-weight:600;font-size:13px}
table.doc td code{background:var(--surface-2);padding:2px 7px;border-radius:6px;font-size:12.5px;color:var(--brand-2)}
.note{display:flex;gap:12px;background:rgba(251,191,36,.08);border:1px solid rgba(251,191,36,.3);border-radius:12px;padding:16px 18px;color:#fde68a;font-size:14.5px;margin-top:18px}

/* ===== Compliance ===== */
.compliance{border:1px solid var(--border);border-left:4px solid var(--ok);background:var(--surface);border-radius:var(--radius);padding:26px 28px;box-shadow:var(--shadow);max-width:880px}
.compliance h3{font-size:18px;margin-bottom:10px;display:flex;align-items:center;gap:10px}
.compliance h3 .badge{background:var(--ok);color:#04121f;font-size:12px;padding:3px 10px;border-radius:999px;font-weight:800}
.compliance p{color:var(--muted);font-size:15.5px}

/* ===== Footer ===== */
footer{background:#070c16;color:#94a3b8;padding:34px 0;border-top:1px solid var(--border)}
footer .wrap{display:flex;flex-wrap:wrap;gap:14px;justify-content:space-between;align-items:center}
footer .copy{font-size:14px}
footer .icp a{color:#cbd5e1;font-size:14px;border-bottom:1px dashed #475569;padding-bottom:2px}
footer .icp a:hover{color:#fff}

/* ===== Responsive ===== */
@media (max-width:880px){
  .menu-btn{display:block}
  .nav-menu{position:absolute;top:66px;left:0;right:0;background:var(--bg-2);border-bottom:1px solid var(--border);
    flex-direction:column;align-items:stretch;padding:10px 22px 16px;gap:4px;display:none}
  .nav-menu.open{display:flex}
  .hero h1{font-size:31px}
  .grid-2,.grid-3,.api-grid,.about-grid{grid-template-columns:1fr}
  .stat-row{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:520px){
  .stat-row{grid-template-columns:1fr}
  .hero{padding:70px 0 60px}
}