:root {
    --ink: #172337;
    --muted: #617086;
    --line: #dfe6ee;
    --soft: #f4f8fb;
    --surface: #ffffff;
    --primary: #086a73;
    --primary-dark: #07545b;
    --accent: #d7a84c;
    --good: #187a55;
    --danger: #a95050;
    --shadow: 0 22px 60px rgba(28, 51, 72, 0.10);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    color: var(--ink);
    background: var(--surface);
    font-family: "Microsoft YaHei", "PingFang SC", "Noto Sans CJK SC", Arial, sans-serif;
    line-height: 1.75;
}

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;
    border-bottom: 1px solid rgba(223, 230, 238, 0.86);
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(14px);
}

.nav-wrap {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 28px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-size: 17px;
    font-weight: 700;
    letter-spacing: 0.01em;
}

.brand-mark {
    width: 38px;
    height: 38px;
    display: grid;
    place-items: center;
    border-radius: 11px;
    color: #fff;
    background: linear-gradient(145deg, var(--primary), #15949d);
    box-shadow: 0 8px 20px rgba(8, 106, 115, 0.22);
}

.nav {
    display: flex;
    align-items: center;
    gap: 28px;
    color: #425268;
    font-size: 14px;
}

.nav a:hover,
.footer-links a:hover,
.developer-links a:hover {
    color: var(--primary);
}

.hero {
    position: relative;
    overflow: hidden;
    padding: 94px 0 82px;
    background:
        radial-gradient(circle at 86% 18%, rgba(215, 168, 76, 0.16), transparent 28%),
        linear-gradient(145deg, #f7fbfb 0%, #edf5f6 55%, #f8f5eb 100%);
}

.hero::before {
    content: "";
    position: absolute;
    width: 440px;
    height: 440px;
    left: -260px;
    bottom: -310px;
    border: 70px solid rgba(8, 106, 115, 0.06);
    border-radius: 50%;
}

.hero-grid {
    position: relative;
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(340px, 0.75fr);
    align-items: center;
    gap: 70px;
}

.eyebrow {
    display: inline-block;
    margin-bottom: 14px;
    color: var(--primary);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

.hero h1 {
    margin-bottom: 22px;
    font-size: clamp(40px, 5.2vw, 66px);
    line-height: 1.12;
    letter-spacing: -0.035em;
}

.hero-copy,
.section-copy {
    color: var(--muted);
    font-size: 17px;
}

.hero-copy {
    max-width: 690px;
    margin-bottom: 30px;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
    margin-bottom: 30px;
}

.button {
    min-height: 46px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 22px;
    border-radius: 10px;
    font-size: 14px;
    font-weight: 700;
}

.button.primary {
    color: #fff;
    background: var(--primary);
    box-shadow: 0 10px 24px rgba(8, 106, 115, 0.22);
}

.button.primary:hover {
    background: var(--primary-dark);
}

.button.secondary {
    border: 1px solid #cbd8df;
    background: rgba(255, 255, 255, 0.72);
}

.trust-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px 24px;
    margin: 0;
    padding: 0;
    color: #43566b;
    font-size: 14px;
    list-style: none;
}

.trust-list li::before {
    content: "✓";
    margin-right: 7px;
    color: var(--good);
    font-weight: 700;
}

.hero-card {
    padding: 30px;
    border: 1px solid rgba(255, 255, 255, 0.86);
    border-radius: 22px;
    background: rgba(255, 255, 255, 0.86);
    box-shadow: var(--shadow);
}

.card-label {
    margin-bottom: 22px;
    color: var(--muted);
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.1em;
}

.flow-list {
    display: grid;
    gap: 18px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.flow-list li {
    display: grid;
    grid-template-columns: 36px 1fr;
    align-items: start;
    gap: 14px;
}

.flow-list li > span {
    width: 34px;
    height: 34px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    color: var(--primary);
    background: #e4f1f2;
    font-size: 13px;
    font-weight: 800;
}

.flow-list strong {
    display: block;
    margin-bottom: 1px;
}

.flow-list p {
    margin-bottom: 0;
    color: var(--muted);
    font-size: 13px;
}

.section {
    padding: 82px 0;
}

.soft-section {
    border-top: 1px solid #e6edf1;
    border-bottom: 1px solid #e6edf1;
    background: var(--soft);
}

.section-heading {
    max-width: 720px;
    margin-bottom: 38px;
}

.section h2,
.document-heading h1 {
    margin-bottom: 14px;
    font-size: clamp(30px, 4vw, 44px);
    line-height: 1.25;
    letter-spacing: -0.025em;
}

.section-heading p,
.developer-card p {
    color: var(--muted);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}

.feature-card {
    padding: 30px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
}

.feature-icon {
    width: 44px;
    height: 44px;
    display: grid;
    place-items: center;
    margin-bottom: 22px;
    border-radius: 12px;
    color: #fff;
    background: var(--primary);
    font-weight: 800;
}

.feature-card h3 {
    margin-bottom: 10px;
    font-size: 20px;
}

.feature-card p {
    margin-bottom: 0;
    color: var(--muted);
    font-size: 14px;
}

.split-grid {
    display: grid;
    grid-template-columns: 0.78fr 1.22fr;
    align-items: start;
    gap: 70px;
}

.boundary-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
}

.boundary-card {
    padding: 28px;
    border: 1px solid var(--line);
    border-radius: 18px;
    background: #fff;
}

.boundary-card.allowed {
    border-top: 4px solid var(--good);
}

.boundary-card.denied {
    border-top: 4px solid var(--danger);
}

.boundary-card h3 {
    margin-bottom: 16px;
}

.boundary-card ul,
.document-card ul {
    margin: 0;
    padding-left: 20px;
    color: var(--muted);
}

.boundary-card li + li,
.document-card li + li {
    margin-top: 8px;
}

.developer-card {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 60px;
    padding: 42px;
    border-radius: 22px;
    color: #fff;
    background: #142e35;
}

.developer-card .eyebrow {
    color: #94d7d8;
}

.developer-card h2 {
    font-size: 30px;
}

.developer-card p {
    max-width: 720px;
    margin-bottom: 0;
    color: #c7d5d8;
}

.developer-links {
    display: grid;
    gap: 10px;
    color: #dce9ea;
    font-size: 14px;
    white-space: nowrap;
}

.site-footer {
    padding: 34px 0;
    border-top: 1px solid var(--line);
    color: #5a687a;
    background: #f8fafb;
    font-size: 13px;
}

.footer-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 30px;
}

.site-footer strong {
    color: var(--ink);
}

.site-footer p {
    margin: 2px 0 0;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 12px 22px;
}

.document-main {
    min-height: calc(100vh - 180px);
    padding: 64px 0 86px;
    background: var(--soft);
}

.document-card {
    max-width: 880px;
    padding: 54px 64px;
    border: 1px solid var(--line);
    border-radius: 20px;
    background: #fff;
    box-shadow: 0 18px 48px rgba(28, 51, 72, 0.07);
}

.document-heading {
    margin-bottom: 44px;
    padding-bottom: 28px;
    border-bottom: 1px solid var(--line);
}

.document-heading p,
.document-card section p {
    color: var(--muted);
}

.document-card section + section {
    margin-top: 34px;
}

.document-card section h2 {
    margin-bottom: 10px;
    font-size: 20px;
}

.document-card section p:last-child {
    margin-bottom: 0;
}

@media (max-width: 900px) {
    .hero-grid,
    .split-grid,
    .developer-card {
        grid-template-columns: 1fr;
    }

    .hero-grid,
    .split-grid {
        gap: 42px;
    }

    .feature-grid {
        grid-template-columns: 1fr;
    }

    .developer-links {
        grid-template-columns: repeat(3, auto);
        white-space: normal;
    }
}

@media (max-width: 680px) {
    .container {
        width: min(100% - 28px, 1120px);
    }

    .site-header {
        position: static;
    }

    .nav-wrap {
        min-height: 64px;
    }

    .nav {
        display: none;
    }

    .hero {
        padding: 64px 0 58px;
    }

    .hero-grid {
        grid-template-columns: minmax(0, 1fr);
    }

    .hero h1 {
        font-size: 40px;
    }

    .hero-card,
    .feature-card,
    .boundary-card {
        padding: 24px;
    }

    .section {
        padding: 58px 0;
    }

    .boundary-grid,
    .developer-links {
        grid-template-columns: 1fr;
    }

    .developer-card {
        gap: 30px;
        padding: 30px 24px;
    }

    .footer-wrap {
        align-items: flex-start;
        flex-direction: column;
    }

    .footer-links {
        justify-content: flex-start;
    }

    .document-main {
        padding: 30px 0 56px;
    }

    .document-card {
        padding: 34px 24px;
    }
}