:root {
    --theme: #0f766e;
    --ink: #10242c;
    --muted: #5b6f78;
    --paper: #f7faf9;
    --card: #ffffff;
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body { color: var(--ink); background: #fff; }
a { color: var(--theme); text-decoration: none; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

.nav {
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(16px);
    background: rgba(255,255,255,.86);
    border-bottom: 1px solid #e5eeef;
}
.nav-inner, .hero-actions, .split, .contact-box, .contact-list, .hero-grid {
    display: flex;
    gap: 24px;
}
.nav-inner { justify-content: space-between; align-items: center; min-height: 72px; }
.brand { font-size: 22px; font-weight: 800; color: var(--ink); }
.nav nav { display: flex; gap: 22px; }
.nav nav a { color: var(--muted); }

.hero {
    background:
        radial-gradient(circle at 15% 20%, rgba(15, 118, 110, .16), transparent 32%),
        linear-gradient(180deg, #f4fbfa, #fff 70%);
    padding: 88px 0 64px;
}
.hero-grid { align-items: center; justify-content: space-between; }
.hero-grid > div:first-child { max-width: 620px; }
.eyebrow {
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--theme);
    font-size: 12px;
    font-weight: 700;
    margin: 0 0 12px;
}
h1, h2 { line-height: 1.2; margin: 0 0 16px; }
h1 { font-size: clamp(36px, 5vw, 56px); }
.lead, .body { color: var(--muted); line-height: 1.8; font-size: 18px; }
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 18px;
    border-radius: 999px;
    background: var(--theme);
    color: #fff;
}
.btn-ghost { background: transparent; color: var(--ink); border: 1px solid #d5e2e4; }

.hero-panel, .info-card, .card, .contact-box, .unbound-card {
    background: var(--card);
    border: 1px solid #e5eeef;
    border-radius: 24px;
    box-shadow: 0 20px 50px rgba(16, 36, 44, .06);
}
.hero-panel { width: min(360px, 100%); padding: 8px; display: grid; gap: 8px; }
.stat { padding: 18px; border-radius: 18px; background: var(--paper); }
.stat strong { display: block; margin-bottom: 6px; }

.section { padding: 72px 0; }
.section.tint { background: var(--paper); }
.split { align-items: stretch; }
.split > div, .contact-box > div { flex: 1; }
.info-card, .contact-box { padding: 28px; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 28px; }
.card { padding: 24px; }
.card h3 { margin-top: 0; }
.contact-list { flex-direction: column; }
.contact-list div { display: grid; gap: 4px; padding-bottom: 12px; border-bottom: 1px solid #e5eeef; }
.contact-list span { color: var(--muted); font-size: 13px; }

.footer {
    background: #10242c;
    color: #c7d5d8;
    padding: 28px 0;
    text-align: center;
}
.footer .beian { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.footer a { color: #9fe1da; }

.unbound {
    min-height: 100vh;
    display: grid;
    place-items: center;
    background: var(--paper);
}
.unbound-card { width: min(560px, calc(100% - 32px)); padding: 36px; text-align: center; }

@media (max-width: 900px) {
    .hero-grid, .split, .contact-box, .nav-inner { flex-direction: column; }
    .cards { grid-template-columns: 1fr; }
    .nav nav { display: none; }
}