:root {
    --primary: #ffc107;
    --primary-dark: #e6a800;
    --primary-light: #fff8e1;
    --primary-glow: rgba(255, 193, 7, 0.35);
    --bg-start: #f0f2f5;
    --bg-end: #e8ecf1;
    --card-bg: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #5c5c6d;
    --text-muted: #8e8e9a;
    --border: #e8e8ed;
    --border-active: #ffc107;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.12);
    --radius-sm: 10px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --wechat: #07c160;
    --wechat-bg: #f0faf4;
    --alipay: #1677ff;
    --alipay-bg: #f0f6ff;
    --price-red: #ff4d2e;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
        "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(160deg, var(--bg-start) 0%, var(--bg-end) 50%, #dfe4ea 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

/* ── 顶部导航 ── */
header {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    padding: 0 5%;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 14px;
    height: 64px;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;
    color: inherit;
    flex-shrink: 0;
}

.header-brand:hover h1 {
    color: var(--primary-dark);
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 20px;
    margin-left: auto;
    margin-right: 12px;
}

.header-nav a {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition);
    white-space: nowrap;
}

.header-nav a:hover {
    color: var(--primary-dark);
}

.site-banner {
    background: linear-gradient(90deg, var(--primary-light) 0%, #fff 50%, var(--primary-light) 100%);
    border-bottom: 1px solid rgba(255, 193, 7, 0.25);
    padding: 10px 16px;
    text-align: center;
}

.site-banner p {
    max-width: 960px;
    margin: 0 auto;
    font-size: 0.82rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.site-domain,
.text-link {
    color: var(--primary-dark);
    font-weight: 600;
    text-decoration: none;
    transition: opacity var(--transition);
}

.site-domain:hover,
.text-link:hover {
    opacity: 0.8;
    text-decoration: underline;
}

.logo {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: var(--shadow-sm);
}

header h1 {
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--text-primary);
}

.header-badge {
    margin-left: auto;
    font-size: 0.72rem;
    font-weight: 500;
    color: var(--primary-dark);
    background: var(--primary-light);
    padding: 4px 12px;
    border-radius: 20px;
    border: 1px solid rgba(255, 193, 7, 0.3);
}

/* ── 主体容器 ── */
.container {
    max-width: 960px;
    margin: 28px auto 40px;
    padding: 0 16px;
}

/* ── 充值主卡片 ── */
.recharge-section {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-md);
    margin-bottom: 24px;
    border: 1px solid rgba(255, 255, 255, 0.8);
    position: relative;
    overflow: hidden;
}

.recharge-section::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary) 0%, #ff9800 50%, var(--primary) 100%);
}

/* ── 区块标题 ── */
.section-title {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 18px;
    letter-spacing: 0.01em;
}

.step-num {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, #ff9800 100%);
    color: #1a1a2e;
    font-size: 0.8rem;
    font-weight: 800;
    flex-shrink: 0;
    box-shadow: 0 2px 8px var(--primary-glow);
}

/* ── 输入框 ── */
.input-group {
    margin-bottom: 32px;
}

.input-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.input-group input {
    width: 100%;
    padding: 14px 18px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    color: var(--text-primary);
    background: #fafafa;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
    outline: none;
}

.input-group input::placeholder {
    color: var(--text-muted);
}

.input-group input:focus {
    border-color: var(--primary);
    background: #fff;
    box-shadow: 0 0 0 4px var(--primary-glow);
}

/* ── 价格网格 ── */
.price-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
    gap: 14px;
    margin-bottom: 32px;
}

.price-item {
    position: relative;
    display: block;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    padding: 18px 12px;
    text-align: center;
    cursor: pointer;
    background: #fafafa;
    transition: transform var(--transition), box-shadow var(--transition),
        border-color var(--transition), background var(--transition);
    user-select: none;
}

.price-item input[type="radio"],
.pay-item input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.price-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 193, 7, 0.15);
    border-color: rgba(255, 193, 7, 0.5);
}

.price-item:has(input:checked) {
    border-color: var(--primary);
    background: var(--primary-light);
    box-shadow: 0 4px 16px var(--primary-glow);
}

.price-item:has(input:checked)::after {
    content: "✓";
    position: absolute;
    top: -9px;
    right: -9px;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, #ff9800 100%);
    color: #1a1a2e;
    font-size: 12px;
    font-weight: 800;
    line-height: 22px;
    text-align: center;
    box-shadow: 0 2px 6px var(--primary-glow);
}

.price-item .coins {
    display: block;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.price-item .money {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--price-red);
}

/* ── 支付方式 ── */
.pay-methods {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-bottom: 32px;
}

.pay-item {
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    cursor: pointer;
    background: #fafafa;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: border-color var(--transition), background var(--transition),
        box-shadow var(--transition);
    user-select: none;
    position: relative;
}

.pay-item:hover {
    box-shadow: var(--shadow-sm);
}

.pay-item:has(input:checked).pay-wechat {
    border-color: var(--wechat);
    background: var(--wechat-bg);
    box-shadow: 0 0 0 3px rgba(7, 193, 96, 0.12);
}

.pay-item:has(input:checked).pay-alipay {
    border-color: var(--alipay);
    background: var(--alipay-bg);
    box-shadow: 0 0 0 3px rgba(22, 119, 255, 0.12);
}

.pay-icon {
    width: 28px;
    height: 28px;
    object-fit: contain;
    flex-shrink: 0;
}

/* ── 提交按钮 ── */
.submit-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, #ffc107 0%, #ff9800 100%);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1.05rem;
    font-weight: 700;
    color: #1a1a2e;
    cursor: pointer;
    letter-spacing: 0.05em;
    transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
    box-shadow: 0 6px 24px var(--primary-glow);
}

.submit-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 28px rgba(255, 152, 0, 0.45);
}

.submit-btn:active {
    transform: translateY(0);
    opacity: 0.92;
}

/* ── 信息卡片 ── */
.info-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 24px 28px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
}

.info-card h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 14px;
}

.info-card h3 .card-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 800;
    flex-shrink: 0;
}

.info-card h3 .card-icon.warn {
    background: #fff3e0;
    color: #f57c00;
}

.info-card h3 .card-icon.help {
    background: var(--primary-light);
    color: var(--primary-dark);
}

.info-card ul {
    list-style: none;
}

.info-card li {
    position: relative;
    padding-left: 16px;
    margin-bottom: 10px;
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.info-card li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 10px;
    width: 5px;
    height: 5px;
    border-radius: 50%;
    background: var(--primary);
}

.info-card li strong {
    color: var(--text-primary);
    font-weight: 600;
}

.info-card li.highlight {
    color: var(--text-primary);
    font-weight: 600;
}

/* ── 底部 ── */
.site-footer {
    background: linear-gradient(180deg, transparent 0%, rgba(255, 255, 255, 0.6) 30%, #fff 100%);
    border-top: 1px solid var(--border);
    margin-top: 12px;
}

.footer-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 36px 20px 48px;
    text-align: center;
}

.footer-trust {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px 32px;
    margin-bottom: 20px;
}

.trust-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.trust-item svg {
    color: var(--primary-dark);
    flex-shrink: 0;
}

.footer-domain {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.footer-domain a,
.footer-brand,
.copyright a {
    color: var(--primary-dark);
    text-decoration: none;
    font-weight: 600;
}

.footer-domain a:hover,
.footer-brand:hover,
.copyright a:hover {
    text-decoration: underline;
}

.footer-notice {
    margin-top: 6px;
    padding: 8px 12px;
    background: var(--primary-light);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.72rem;
    line-height: 1.7;
}

.footer-notice strong {
    color: var(--text-primary);
}

.footer-slogan {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 14px;
    font-weight: 500;
}

.footer-links {
    margin-bottom: 16px;
    font-size: 0.8rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--primary-dark);
}

.footer-links .sep,
.footer-legal .sep {
    margin: 0 8px;
    color: #d0d0d8;
}

.footer-legal {
    font-size: 0.75rem;
    color: var(--text-muted);
    line-height: 2;
    margin-bottom: 12px;
}

.footer-legal a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color var(--transition);
}

.footer-legal a:hover {
    color: var(--text-secondary);
}

.copyright {
    font-size: 0.72rem;
    color: #b0b0ba;
    opacity: 0.85;
}

/* ── 响应式 ── */
@media (max-width: 600px) {
    .recharge-section {
        padding: 22px 18px;
        border-radius: var(--radius-md);
    }

    .price-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }

    .price-item {
        padding: 14px 8px;
    }

    .price-item .coins {
        font-size: 0.95rem;
    }

    .pay-methods {
        gap: 10px;
    }

    .pay-item {
        padding: 14px 10px;
        font-size: 0.875rem;
    }

    .pay-icon {
        width: 24px;
        height: 24px;
    }

    .header-nav {
        display: none;
    }

    .header-badge {
        display: none;
    }

    .site-banner p {
        font-size: 0.75rem;
    }

    .info-card {
        padding: 20px;
    }
}