:root {
    --pay-bg: #09090B;
    --pay-surface: rgba(18, 18, 26, 0.8);
    --pay-surface-strong: rgba(24, 24, 34, 0.9);
    --pay-border: rgba(255, 255, 255, 0.1);
    --pay-text: #FAFAFA;
    --pay-muted: #A1A1AA;
    --pay-brand: #6366F1;
    --pay-brand-strong: #818CF8;
    --pay-wechat: #10B981;
    --pay-alipay: #3B82F6;
}

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

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--pay-text);
    line-height: 1.6;
}

.pay-page {
    min-height: 100vh;
    background: 
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(99, 102, 241, 0.12), transparent),
        var(--pay-bg);
}

.pay-topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 16px 24px;
    border-bottom: 1px solid var(--pay-border);
    background: rgba(9, 9, 11, 0.8);
    backdrop-filter: blur(20px);
}

.pay-brand {
    color: var(--pay-text);
    text-decoration: none;
    font-weight: 800;
    font-size: 1.125rem;
    letter-spacing: -0.02em;
    transition: color 0.15s ease;
}

.pay-brand:hover {
    color: var(--pay-brand-strong);
}

.pay-back {
    color: var(--pay-muted);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    border: 1px solid var(--pay-border);
    background: transparent;
    border-radius: 8px;
    padding: 8px 16px;
    transition: all 0.15s ease;
}

.pay-back:hover {
    color: var(--pay-text);
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.15);
}

.pay-shell {
    min-height: calc(100vh - 60px);
    display: grid;
    place-items: center;
    padding: 48px 24px;
}

.pay-card {
    width: min(480px, 100%);
    border: 1px solid var(--pay-border);
    border-radius: 24px;
    background: var(--pay-surface);
    backdrop-filter: blur(20px);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.4);
    padding: 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.pay-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.1), transparent);
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    border-radius: 100px;
    border: 1px solid rgba(99, 102, 241, 0.2);
    background: rgba(99, 102, 241, 0.1);
    color: var(--pay-brand-strong);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

h1 {
    margin: 16px 0 8px;
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 800;
    line-height: 1.2;
    color: var(--pay-text);
    letter-spacing: -0.02em;
}

p {
    margin: 0;
}

.lead {
    color: var(--pay-muted);
    font-size: 1rem;
}

.qr-wrap {
    margin: 32px auto 24px;
    background: #fff;
    width: min(300px, 100%);
    padding: 16px;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.qr-wrap.wechat {
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.15);
}

.qr-wrap.alipay {
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.15);
}

.qr-wrap img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 12px;
}

.pay-steps {
    margin: 0;
    padding: 0 0 0 24px;
    text-align: left;
    color: var(--pay-muted);
    font-size: 15px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tip {
    margin-top: 20px;
    padding: 14px 18px;
    font-size: 13px;
    color: #FCD34D;
    background: rgba(245, 158, 11, 0.08);
    border: 1px dashed rgba(245, 158, 11, 0.3);
    border-radius: 12px;
}

.actions {
    margin-top: 24px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.btn {
    border: 1px solid var(--pay-border);
    background: rgba(255, 255, 255, 0.05);
    color: var(--pay-text);
    border-radius: 10px;
    padding: 12px 16px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.15s ease;
    font-family: inherit;
}

.btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.15);
}

.btn.primary {
    color: #fff;
    border-color: transparent;
    background: linear-gradient(135deg, var(--pay-brand), var(--pay-brand-strong));
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn.primary:hover {
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.4);
    transform: translateY(-2px);
}

.footer-note {
    margin-top: 20px;
    font-size: 12px;
    color: var(--pay-muted);
    opacity: 0.7;
}

@media (max-width: 640px) {
    .pay-topbar {
        padding: 12px 16px;
    }

    .pay-shell {
        padding: 32px 16px;
    }

    .pay-card {
        padding: 28px;
        border-radius: 20px;
    }

    .qr-wrap {
        padding: 12px;
    }
}

@media (max-width: 480px) {
    .actions {
        grid-template-columns: 1fr;
    }
}