:root {
    --teal: #0f9d8e;
    --teal-deep: #0a6f65;
    --leaf: #7ed3c4;
    --paper: #f3faf7;
    --ink: #14332f;
    --muted: #5b746f;
    --line: #c7e4dc;
    --gold: #e8c36a;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: "Segoe UI", "Microsoft YaHei", sans-serif;
    background: var(--paper);
    color: var(--ink);
    line-height: 1.75;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 11px 22px;
    border: 0;
    border-radius: 8px;
    background: var(--teal);
    color: #fff;
    font-weight: 800;
}
.btn:hover { background: var(--teal-deep); }
.btn-ghost { background: #fff; color: var(--teal-deep); box-shadow: inset 0 0 0 1.5px var(--teal); }
.btn-lg { padding: 13px 26px; font-size: 16px; }

.term-bar {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: 0.08em;
    color: #fff;
}
.term-bar span { padding: 8px; text-align: center; }
.term-bar span:nth-child(1) { background: #14b8a6; }
.term-bar span:nth-child(2) { background: var(--teal); }
.term-bar span:nth-child(3) { background: #0c8579; }
.term-bar span:nth-child(4) { background: var(--teal-deep); }

.site-nav {
    position: sticky;
    top: 0;
    z-index: 40;
    background: #fff;
    border-bottom: 1px solid var(--line);
}
.nav-wrap { min-height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 14px; }
.logo { display: flex; align-items: center; gap: 8px; font-weight: 800; color: var(--teal-deep); }
.logo-mark {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    background: var(--teal);
    color: #fff;
    display: grid;
    place-items: center;
}
.nav-menu { display: flex; gap: 16px; flex-wrap: wrap; }
.nav-menu a { font-size: 14px; color: var(--muted); font-weight: 700; }
.nav-menu a:hover, .nav-menu a.active { color: var(--teal); }
.nav-actions { display: flex; gap: 8px; }
.nav-toggle { display: none; }
.nav-burger { display: none; border: 1.5px solid var(--teal); color: var(--teal-deep); padding: 7px 12px; border-radius: 8px; }

.hero {
    padding: 54px 0 40px;
    background:
        radial-gradient(circle at 12% 18%, #c8efe6 0%, transparent 32%),
        linear-gradient(180deg, #fff 0%, var(--paper) 100%);
}
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 36px; align-items: center; }
.tag {
    display: inline-block;
    background: #e7f7f3;
    color: var(--teal-deep);
    border: 1px solid var(--line);
    font-size: 12px;
    font-weight: 800;
    padding: 4px 10px;
    border-radius: 999px;
    margin-bottom: 12px;
}
.hero h1 { font-size: clamp(28px, 4vw, 42px); line-height: 1.25; margin-bottom: 12px; }
.hero-kicker { color: var(--teal); font-weight: 800; margin-bottom: 8px; }
.hero p { color: var(--muted); margin-bottom: 18px; }
.enroll {
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 18px;
    box-shadow: 0 10px 28px rgba(15, 157, 142, 0.08);
}
.meta { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 12px; font-size: 13px; color: var(--muted); }
.hero-visual img { width: 100%; border-radius: 16px; box-shadow: 0 16px 36px rgba(10, 111, 101, 0.12); }

.data-band { background: var(--teal-deep); color: #fff; padding: 24px 0; }
.data-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; text-align: center; }
.data-num { font-size: 28px; font-weight: 800; color: var(--gold); }
.data-label { font-size: 13px; }

.section { padding: 68px 0; }
.section.alt { background: #fff; }
.section-head { text-align: center; margin-bottom: 28px; }
.section-head h2 { font-size: 26px; margin-bottom: 8px; }
.section-head p { color: var(--muted); }

.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 20px; }
.card h3 { margin: 8px 0; }
.card p { color: var(--muted); font-size: 14px; }
.icon {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    background: #e7f7f3;
    color: var(--teal-deep);
    display: grid;
    place-items: center;
    font-size: 12px;
    font-weight: 800;
}
.solution-card { padding: 0; overflow: hidden; }
.solution-card img { height: 168px; width: 100%; object-fit: cover; }
.solution-card div { padding: 16px; }
.price { font-size: 22px; color: var(--teal); font-weight: 800; margin: 6px 0 8px; }
.card.main { box-shadow: 0 0 0 2px var(--teal); }

.cta {
    padding: 60px 0;
    text-align: center;
    background: linear-gradient(180deg, var(--teal), var(--teal-deep));
    color: #fff;
}
.cta h2 { font-size: 28px; margin-bottom: 8px; }
.cta p { margin-bottom: 16px; }
.cta .btn { background: #fff; color: var(--teal-deep); }
.cta .btn-ghost { background: transparent; color: #fff; box-shadow: inset 0 0 0 1.5px #fff; }
.cta-actions { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; }

.site-footer { background: #0e2d29; color: #c7ddd8; padding: 42px 0 16px; }
.footer-grid { display: grid; grid-template-columns: 1.3fr 1fr 1fr 1fr; gap: 18px; margin-bottom: 16px; }
.footer-grid h4 { color: var(--gold); margin-bottom: 8px; }
.footer-grid a, .footer-grid p { display: block; margin-bottom: 8px; font-size: 14px; color: #c7ddd8; }
.logo-light { color: #fff; }
.footer-bottom { border-top: 1px solid #244742; padding-top: 12px; text-align: center; font-size: 12px; }

.page-hero { padding: 40px 0 8px; text-align: center; }
.page-hero h1 { font-size: 30px; margin-bottom: 8px; }
.page-hero p { color: var(--muted); }

.dl-list { display: grid; gap: 12px; }
.dl-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    background: #fff;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 20px;
}
.dl-item.main { box-shadow: inset 6px 0 0 var(--teal); }
.specs { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0; font-size: 12px; color: var(--muted); }
.specs span { background: #e7f7f3; padding: 2px 8px; border-radius: 999px; }
.shot { max-width: 840px; margin: 24px auto 0; }
.shot img { border-radius: 16px; }

.help-list { display: grid; gap: 12px; max-width: 840px; margin: 0 auto; }
.help-box { background: #fff; border: 1px solid var(--line); border-radius: 14px; padding: 22px; }
.help-box h3 { color: var(--teal-deep); margin-bottom: 8px; }
.help-box p { color: var(--muted); margin-bottom: 8px; }

@media (max-width: 992px) {
    .nav-burger { display: inline-block; }
    .nav-toggle:checked + .nav-burger + .nav-menu { display: flex; }
    .nav-menu {
        display: none;
        position: absolute;
        left: 16px;
        right: 16px;
        top: 118px;
        background: #fff;
        border: 1px solid var(--line);
        border-radius: 12px;
        padding: 12px;
        flex-direction: column;
    }
    .hero-grid, .grid-3, .footer-grid { grid-template-columns: 1fr 1fr; }
    .term-bar { grid-template-columns: 1fr 1fr; }
    .data-grid { grid-template-columns: 1fr 1fr; }
    .dl-item { flex-direction: column; text-align: center; }
    .nav-actions .btn-ghost { display: none; }
}

@media (max-width: 640px) {
    .hero-grid, .grid-3, .footer-grid { grid-template-columns: 1fr; }
}