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

:root {
    --bg: #000000;
    --fg: #ffffff;
    --muted: #9ca3af;
    --muted-strong: #d1d5db;
    --line-soft: rgba(255, 255, 255, 0.05);
}

html {
    background: var(--bg);
}

body {
    min-height: 100vh;
    overflow-x: hidden;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--fg);
    line-height: 1.5;
}

.page-shell {
    position: relative;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: #000000;
    color: #ffffff;
    overflow: hidden;
}

.page-shell::before,
.page-shell::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
}

.page-shell::before {
    z-index: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 100px 100px;
}

.page-shell::after {
    z-index: 0;
    background: radial-gradient(circle at 50% 42%, rgba(255, 255, 255, 0.08) 0%, transparent 42%);
    opacity: 0.9;
}

.interactive-bg {
    position: fixed;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    overflow: hidden;
}

.light-orb {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at var(--x, 50%) var(--y, 50%), rgba(255, 255, 255, 0.15) 0%, transparent 50%);
    opacity: 0.2;
}

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 100px 100px;
}

.top-nav {
    position: fixed;
    top: 0;
    z-index: 20;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--line-soft);
    backdrop-filter: blur(12px);
}

.brand-lockup {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-weight: 700;
    cursor: default;
}

.brand-invert {
    padding: 0.1rem 0.4rem;
    background: #fff;
    color: #000;
}

.brand-outline {
    padding: 0.1rem 0.4rem;
    border: 1px solid #fff;
    color: #fff;
}

.brand-tech {
    margin-left: 0.5rem;
    font-size: 0.75rem;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--muted);
    opacity: 0.75;
}

.hero {
    position: relative;
    z-index: 2;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 5.5rem 1rem 1rem;
}

.hero-content {
    width: 100%;
    max-width: 860px;
    text-align: center;
}

.eyebrow {
    display: inline-block;
    padding: 0.5rem 1rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--muted);
    font-size: 0.75rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
}

.title-stack {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.title-group {
    margin-top: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.title-line {
    width: 5rem;
    height: 1px;
    background: linear-gradient(90deg, transparent, #fff);
}

.title-line.reverse {
    background: linear-gradient(90deg, #fff, transparent);
}

.hero-title {
    font-size: clamp(3rem, 9vw, 8rem);
    font-weight: 200;
    letter-spacing: 0.24em;
    color: #fff;
    line-height: 1;
}

.title-divider {
    margin-top: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.diamond {
    width: 0.5rem;
    height: 0.5rem;
    background: #fff;
    transform: rotate(45deg);
}

.divider-line {
    width: 6rem;
    height: 1px;
    background: rgba(255, 255, 255, 0.5);
}

.hero-subtitle {
    margin-top: 2rem;
    color: var(--muted-strong);
    font-size: clamp(1.25rem, 3vw, 2rem);
    font-style: italic;
    font-weight: 300;
    letter-spacing: 0.14em;
}

.hero-description {
    margin: 1.5rem auto 0;
    max-width: 640px;
    color: var(--muted);
    font-size: clamp(0.95rem, 2vw, 1.3rem);
    line-height: 1.9;
    letter-spacing: 0.12em;
    font-weight: 300;
    padding: 0 1rem;
}

.hero-actions {
    margin-top: 2.75rem;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 1rem;
}

.primary-btn {
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    width: min(100%, 18rem);
    padding: 1.1rem 2rem;
    background: #ffffff;
    color: #000000;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.22em;
    text-transform: uppercase;
    transition: transform 0.3s ease;
}

.primary-btn:hover {
    transform: translateY(-2px);
}

.btn-text,
.btn-icon {
    position: relative;
    z-index: 1;
}

.btn-icon {
    font-size: 1.2rem;
    transition: transform 0.3s ease;
}

.primary-btn:hover .btn-icon {
    transform: translateX(6px);
}

.btn-hover {
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: #e5e7eb;
    transition: left 0.3s ease;
}

.primary-btn:hover .btn-hover {
    left: 0;
}

.footer {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    padding: 1.25rem 1rem 1.75rem;
    border-top: 1px solid var(--line-soft);
    text-align: center;
    color: #6b7280;
    font-size: 0.75rem;
    letter-spacing: 0.08em;
}

.beian-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.icp-info a,
.public-security-info {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s ease;
}

.icp-info a {
    text-decoration: underline;
    text-underline-offset: 2px;
}

.icp-info a:hover,
.public-security-info:hover {
    color: #fff;
}

.beian-icon {
    width: 16px;
    height: 16px;
    display: block;
    flex-shrink: 0;
}

.reveal {
    opacity: 0;
    animation: fadeIn 0.8s ease-out forwards;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 768px) {
    .top-nav {
        padding: 1rem;
    }

    .brand-tech {
        display: none;
    }

    .title-group {
        gap: 0.75rem;
    }

    .title-line {
        width: 2.8rem;
    }

    .divider-line {
        width: 4rem;
    }

    .hero-title {
        letter-spacing: 0.18em;
    }

    .hero-description {
        letter-spacing: 0.08em;
    }

    .footer {
        padding-bottom: 2rem;
    }
}

@media (max-width: 480px) {
    .hero {
        padding-left: 1rem;
        padding-right: 1rem;
    }

    .eyebrow {
        font-size: 0.68rem;
        letter-spacing: 0.22em;
    }

    .hero-title {
        letter-spacing: 0.12em;
    }

    .desktop-break {
        display: none;
    }
}

.support-main,
.pay-main {
    position: relative;
    z-index: 2;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 6.5rem 1.25rem 2rem;
}

.support-panel,
.pay-panel {
    width: 100%;
    max-width: 760px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(14px);
    padding: 2rem;
}

.support-tag,
.pay-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    color: var(--muted);
    font-size: 0.75rem;
    letter-spacing: 0.22em;
    text-transform: uppercase;
}

.support-title,
.pay-title {
    font-size: clamp(2rem, 6vw, 4.2rem);
    font-weight: 200;
    letter-spacing: 0.14em;
    line-height: 1.1;
}

.support-subtitle,
.pay-subtitle {
    margin-top: 1rem;
    color: var(--muted-strong);
    font-size: 1rem;
    letter-spacing: 0.1em;
}

.support-note,
.pay-note,
.support-disclaimer {
    margin-top: 1.5rem;
    color: var(--muted);
    line-height: 1.8;
    font-size: 0.95rem;
}

.tier-grid {
    margin-top: 2rem;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1rem;
}

.tier-card {
    position: relative;
    padding: 1.4rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.02);
}

.tier-card::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.06), transparent 65%);
    pointer-events: none;
}

.tier-name {
    color: var(--muted);
    font-size: 0.75rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
}

.tier-price {
    margin-top: 0.75rem;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.tier-points {
    margin-top: 0.5rem;
    color: #f5d66f;
    font-size: 0.9rem;
    letter-spacing: 0.1em;
}

.tier-copy {
    margin-top: 0.9rem;
    color: var(--muted-strong);
    font-size: 0.88rem;
}

.support-actions,
.pay-actions {
    margin-top: 2rem;
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.ghost-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 11rem;
    padding: 1rem 1.4rem;
    border: 1px solid rgba(255, 255, 255, 0.18);
    color: #ffffff;
    text-decoration: none;
    letter-spacing: 0.12em;
    transition: border-color 0.2s ease, transform 0.2s ease;
}

.ghost-btn:hover {
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-1px);
}

.ghost-btn[aria-disabled="true"] {
    cursor: not-allowed;
    opacity: 0.65;
}

.support-status {
    margin-top: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    padding: 0.5rem 0.9rem;
    border: 1px solid rgba(255, 255, 255, 0.14);
    color: var(--muted-strong);
    font-size: 0.75rem;
    letter-spacing: 0.12em;
}

.status-dot {
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 999px;
    background: #ffffff;
    box-shadow: 0 0 12px rgba(255, 255, 255, 0.55);
}

.pay-shell {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.pay-summary {
    margin-top: 1.75rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.pay-amount {
    font-size: 2.4rem;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.pay-points {
    margin-top: 0.65rem;
    color: #f5d66f;
    font-size: 1rem;
    letter-spacing: 0.12em;
}

.pay-message {
    color: var(--muted);
    font-size: 0.95rem;
    line-height: 1.8;
}

.pay-spinner {
    width: 3rem;
    height: 3rem;
    border: 3px solid rgba(255, 255, 255, 0.12);
    border-top-color: #ffffff;
    border-radius: 999px;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 768px) {
    .support-panel,
    .pay-panel {
        padding: 1.35rem;
    }

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

    .support-actions,
    .pay-actions {
        flex-direction: column;
    }

    .primary-btn,
    .ghost-btn {
        width: 100%;
    }
}