:root {
    --bg: #0c1f17;
    --bg-muted: #132a1f;
    --surface: #ffffff;
    --surface-dark: #163828;
    --text: #f4fbf7;
    --text-on-light: #0f2419;
    --text-secondary: rgba(244, 251, 247, 0.72);
    --text-secondary-on-light: #3d5c4a;
    --primary: #12b886;
    --primary-dark: #099268;
    --gold: #fcc419;
    --gold-dark: #f59f00;
    --red: #ff6b6b;
    --red-dark: #e03131;
    --border: rgba(255, 255, 255, 0.12);
    --border-light: #c3e6d5;
    --shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
    --shadow-glow: 0 0 40px rgba(18, 184, 134, 0.35);
    --radius: 14px;
    --wrap: min(1120px, calc(100% - 32px));
    --font: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    --grad-hero: linear-gradient(145deg, #063221 0%, #0c1f17 38%, #1a0a12 100%);
    --grad-primary: linear-gradient(135deg, var(--gold) 0%, var(--gold-dark) 55%, var(--red) 100%);
    --grad-green: linear-gradient(135deg, #20c997 0%, #099268 100%);
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-on-light);
    background: #e8f5ef;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    max-width: 100%;
    display: block;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.wrap {
    width: var(--wrap);
    margin-inline: auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 20;
    background: rgba(6, 50, 33, 0.92);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(12px);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    min-height: 64px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 18px;
    color: var(--text);
}

.brand__mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: var(--grad-primary);
    font-size: 20px;
    box-shadow: 0 4px 16px rgba(252, 196, 25, 0.4);
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.site-nav__link {
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    transition: color 0.15s, background 0.15s;
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
    color: var(--gold);
    background: rgba(252, 196, 25, 0.12);
}

.site-nav__btn {
    margin-left: 4px;
    padding: 9px 18px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 700;
    color: var(--text-on-light);
    background: var(--grad-primary);
    box-shadow: 0 4px 20px rgba(252, 196, 25, 0.45);
    transition: transform 0.15s, box-shadow 0.15s;
}

.site-nav__btn:hover,
.site-nav__btn:focus-visible {
    transform: translateY(-1px);
    box-shadow: 0 8px 28px rgba(245, 159, 0, 0.55);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 0;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--surface-dark);
    cursor: pointer;
}

.nav-toggle__bar {
    display: block;
    width: 18px;
    height: 2px;
    margin-inline: auto;
    background: var(--gold);
    border-radius: 1px;
}

.hero {
    padding: 64px 0 80px;
    color: var(--text);
    background:
        radial-gradient(circle at 85% 15%, rgba(252, 196, 25, 0.22), transparent 42%),
        radial-gradient(circle at 10% 90%, rgba(255, 107, 107, 0.18), transparent 40%),
        radial-gradient(circle at 50% 50%, rgba(18, 184, 134, 0.15), transparent 55%),
        var(--grad-hero);
}

.hero__grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 40px;
    align-items: center;
}

.hero__eyebrow {
    display: inline-block;
    margin: 0 0 16px;
    padding: 6px 14px;
    border-radius: 999px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.06em;
    color: var(--text-on-light);
    background: var(--gold);
}

.hero__title {
    margin: 0 0 18px;
    font-size: clamp(30px, 4.5vw, 46px);
    line-height: 1.2;
    font-weight: 900;
    text-shadow: 0 2px 24px rgba(0, 0, 0, 0.25);
}

.hero__desc {
    margin: 0 0 32px;
    max-width: 36em;
    color: var(--text-secondary);
    font-size: 17px;
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 44px;
    padding: 0 22px;
    border-radius: 999px;
    font-size: 15px;
    font-weight: 700;
    border: 2px solid transparent;
    cursor: pointer;
    transition: transform 0.15s, box-shadow 0.15s, background 0.15s, border-color 0.15s;
}

.btn--lg {
    min-height: 52px;
    padding-inline: 28px;
    font-size: 16px;
}

.btn--primary {
    color: var(--text-on-light);
    background: var(--grad-primary);
    box-shadow: 0 8px 28px rgba(245, 159, 0, 0.45);
}

.btn--primary:hover,
.btn--primary:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 12px 36px rgba(255, 107, 107, 0.4);
}

.btn--ghost {
    color: var(--text);
    background: transparent;
    border-color: rgba(255, 255, 255, 0.35);
}

.btn--ghost:hover,
.btn--ghost:focus-visible {
    border-color: var(--gold);
    color: var(--gold);
    background: rgba(252, 196, 25, 0.1);
}

.hero-card {
    padding: 28px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius);
    box-shadow: var(--shadow), var(--shadow-glow);
    backdrop-filter: blur(8px);
}

.hero-card__label {
    margin: 0 0 20px;
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--gold);
}

.hero-card__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 14px;
}

.hero-card__list li {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 14px;
    border-bottom: 1px dashed rgba(255, 255, 255, 0.2);
    font-size: 14px;
}

.hero-card__list li:last-child {
    padding-bottom: 0;
    border-bottom: 0;
}

.hero-card__list span {
    color: var(--text-secondary);
}

.hero-card__list strong {
    font-weight: 700;
    color: var(--text);
}

.section {
    padding: 72px 0;
    background: #e8f5ef;
}

.section--muted {
    background: linear-gradient(180deg, #d4eddf 0%, #b8e0cc 100%);
}

.section-head {
    max-width: 640px;
    margin-bottom: 40px;
}

.section-head__title {
    margin: 0 0 10px;
    font-size: clamp(26px, 3vw, 36px);
    font-weight: 900;
    color: var(--text-on-light);
}

.section-head__desc {
    margin: 0;
    color: var(--text-secondary-on-light);
    font-size: 17px;
}

.feature-grid,
.earn-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.feature,
.earn-card {
    padding: 24px;
    background: var(--surface);
    border: 2px solid transparent;
    border-radius: var(--radius);
    box-shadow: 0 8px 24px rgba(15, 36, 25, 0.08);
    transition: transform 0.15s, box-shadow 0.15s;
}

.feature:hover,
.earn-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 40px rgba(15, 36, 25, 0.14);
}

.feature:nth-child(1) { border-top: 4px solid var(--primary); }
.feature:nth-child(2) { border-top: 4px solid var(--gold-dark); }
.feature:nth-child(3) { border-top: 4px solid var(--red); }
.feature:nth-child(4) { border-top: 4px solid #7048e8; }

.earn-card:nth-child(1) { border-left: 4px solid var(--gold); }
.earn-card:nth-child(2) { border-left: 4px solid var(--primary); }
.earn-card:nth-child(3) { border-left: 4px solid var(--red); }
.earn-card:nth-child(4) { border-left: 4px solid #7048e8; }

.feature__icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    margin-bottom: 16px;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 900;
    color: #fff;
    background: var(--grad-green);
    box-shadow: 0 6px 16px rgba(9, 146, 104, 0.35);
}

.feature:nth-child(2) .feature__icon { background: linear-gradient(135deg, #fcc419, #f59f00); box-shadow: 0 6px 16px rgba(245, 159, 0, 0.35); }
.feature:nth-child(3) .feature__icon { background: linear-gradient(135deg, #ff8787, #e03131); box-shadow: 0 6px 16px rgba(224, 49, 49, 0.35); }
.feature:nth-child(4) .feature__icon { background: linear-gradient(135deg, #9775fa, #7048e8); box-shadow: 0 6px 16px rgba(112, 72, 232, 0.35); }

.feature__title,
.earn-card__title {
    margin: 0 0 10px;
    font-size: 18px;
    font-weight: 800;
    color: var(--text-on-light);
}

.feature__text,
.earn-card__text {
    margin: 0;
    font-size: 14px;
    line-height: 1.65;
    color: var(--text-secondary-on-light);
}

.steps {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 20px;
    max-width: 720px;
}

.steps__item {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: var(--surface);
    border: 2px solid var(--border-light);
    border-radius: var(--radius);
    box-shadow: 0 8px 24px rgba(15, 36, 25, 0.06);
}

.steps__num {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    font-weight: 900;
    font-size: 18px;
    color: var(--text-on-light);
    background: var(--grad-primary);
    box-shadow: 0 4px 16px rgba(245, 159, 0, 0.4);
}

.steps__title {
    margin: 0 0 6px;
    font-size: 17px;
    font-weight: 800;
    color: var(--text-on-light);
}

.steps__text {
    margin: 0;
    font-size: 14px;
    color: var(--text-secondary-on-light);
}

.cta {
    padding: 64px 0;
    color: var(--text);
    background:
        radial-gradient(circle at 100% 0%, rgba(252, 196, 25, 0.25), transparent 45%),
        radial-gradient(circle at 0% 100%, rgba(255, 107, 107, 0.2), transparent 40%),
        linear-gradient(135deg, #063221 0%, #0a4d32 50%, #5c0a18 100%);
}

.cta__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.cta__title {
    margin: 0 0 8px;
    font-size: clamp(24px, 3vw, 32px);
    font-weight: 900;
}

.cta__desc {
    margin: 0;
    color: var(--text-secondary);
    font-size: 17px;
}

.site-footer {
    padding: 24px 0;
    border-top: 3px solid var(--primary);
    background: #063221;
    color: var(--text-secondary);
}

.site-footer__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
    font-size: 14px;
}

.site-footer__meta {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.site-footer__copy,
.site-footer__beian {
    margin: 0;
}

.site-footer__link {
    color: var(--gold);
    font-weight: 600;
}

.site-footer__link:hover,
.site-footer__link:focus-visible {
    color: #fff;
}

@media (max-width: 960px) {
    .hero__grid {
        grid-template-columns: 1fr;
    }

    .hero__card {
        order: -1;
    }

    .feature-grid,
    .earn-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 720px) {
    .nav-toggle {
        display: flex;
    }

    .site-nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        padding: 12px 16px 16px;
        background: #063221;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow);
        display: none;
    }

    .site-nav.is-open {
        display: flex;
    }

    .site-header__inner {
        position: relative;
        flex-wrap: wrap;
    }

    .site-nav__btn {
        margin-left: 0;
        text-align: center;
    }

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

    .hero {
        padding-top: 36px;
    }

    .section {
        padding: 48px 0;
    }
}