:root {
    --bg: #f4f8fb;
    --card: #ffffff;
    --text: #142033;
    --muted: #667085;
    --line: #e4edf5;
    --brand: #006bb6;
    --brand-dark: #005494;
    --brand-2: #00a8e8;
    --ice: #e6f7ff;
    --soft: #f0fbff;
    --ok: #16a34a;
    --warn: #f59e0b;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: linear-gradient(180deg, #f8fcff 0%, var(--bg) 48%, #f7fbff 100%);
    line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
.container { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(255,255,255,.92);
    border-bottom: 1px solid var(--line);
    backdrop-filter: blur(16px);
}
.nav {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}
.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 850;
    letter-spacing: -.02em;
}
.brand-mark {
    width: 40px;
    height: 40px;
    border-radius: 14px;
    display: grid;
    place-items: center;
    color: #fff;
    background: radial-gradient(circle at 32% 22%, rgba(255,255,255,.36), transparent 28%), linear-gradient(135deg, var(--brand), var(--brand-2));
    box-shadow: 0 14px 32px rgba(0,107,182,.22);
}
.nav-links { display: flex; gap: 18px; align-items: center; font-size: 14px; color: var(--muted); }
.nav-links a:hover { color: var(--brand); }
.hero {
    padding: 78px 0 60px;
    background:
        radial-gradient(circle at 14% 16%, rgba(0,168,232,.18), transparent 34%),
        radial-gradient(circle at 88% 10%, rgba(0,107,182,.16), transparent 30%);
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 42px; align-items: center; }
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: 999px;
    background: var(--ice);
    color: var(--brand-dark);
    font-size: 13px;
    font-weight: 760;
}
h1 { margin: 18px 0 18px; font-size: clamp(38px, 6vw, 64px); line-height: 1.04; letter-spacing: -.05em; }
.lead { margin: 0 0 26px; color: var(--muted); font-size: 18px; max-width: 700px; }
.actions { display: flex; flex-wrap: wrap; gap: 12px; }
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 11px 17px;
    border-radius: 999px;
    border: 1px solid transparent;
    background: var(--brand);
    color: #fff;
    font-weight: 760;
    box-shadow: 0 12px 30px rgba(0,107,182,.23);
}
.btn:hover { background: var(--brand-dark); }
.btn.secondary { background: #fff; color: var(--text); border-color: var(--line); box-shadow: none; }
.panel {
    background: rgba(255,255,255,.92);
    border: 1px solid var(--line);
    border-radius: 30px;
    padding: 26px;
    box-shadow: 0 24px 70px rgba(16,24,40,.10);
}
.fridge-card {
    border-radius: 26px;
    padding: 20px;
    background: linear-gradient(160deg, #0f172a 0%, #163a5f 62%, #0b6ea8 100%);
    color: #e5f6ff;
    overflow: hidden;
    position: relative;
}
.fridge-card::after {
    content: "";
    position: absolute;
    right: -36px;
    top: -36px;
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: rgba(255,255,255,.10);
}
.fridge-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; position: relative; z-index: 1; }
.temp-badge { padding: 6px 10px; border-radius: 999px; background: rgba(255,255,255,.12); color: #fff; font-weight: 760; font-size: 13px; }
.metric { display: grid; grid-template-columns: 1fr auto; gap: 8px; padding: 14px 0; border-top: 1px solid rgba(255,255,255,.14); position: relative; z-index: 1; }
.metric:first-of-type { border-top: 0; }
.metric span { color: #b6d7ee; }
.metric strong { color: #fff; }
.section { padding: 64px 0; }
.section-title { max-width: 760px; margin-bottom: 28px; }
.section-title h2 { font-size: clamp(28px, 4vw, 42px); line-height: 1.12; margin: 0 0 12px; letter-spacing: -.03em; }
.section-title p { color: var(--muted); margin: 0; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 24px; padding: 24px; box-shadow: 0 14px 36px rgba(16,24,40,.06); }
.card h3 { margin: 0 0 10px; font-size: 19px; }
.card p, .card li { color: var(--muted); }
.card p { margin: 0; }
.card ul { margin: 12px 0 0; padding-left: 18px; }
.badge-ok { display: inline-flex; padding: 6px 10px; border-radius: 999px; background: #ecfdf3; color: #067647; font-size: 13px; font-weight: 760; }
.notice { background: #f0fbff; border: 1px solid #bae6fd; border-radius: 22px; padding: 18px; color: #075985; }
.form-card label { display: block; font-weight: 760; margin: 14px 0 6px; }
.input, textarea, select { width: 100%; border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; font: inherit; background: #fff; }
textarea { min-height: 130px; resize: vertical; }
.footer { padding: 34px 0; border-top: 1px solid var(--line); color: var(--muted); background: #fff; }
.footer-inner { display: flex; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
@media (max-width: 860px) {
    .hero-grid, .cards { grid-template-columns: 1fr; }
    .nav { align-items: flex-start; flex-direction: column; padding: 16px 0; }
    .nav-links { flex-wrap: wrap; }
}