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

:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #111638;
    --bg-card: #1a1f3a;
    --bg-card-hover: #222850;
    --accent: #4a9eff;
    --accent-hover: #6bb3ff;
    --text-primary: #e8eaf0;
    --text-secondary: #9ca3b8;
    --text-muted: #6b7280;
    --warning-bg: #2a1f0a;
    --warning-border: #d4a017;
    --border: #2a2f4a;
    --radius: 10px;
    --max-width: 1100px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--accent-hover);
}

/* Navbar */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 39, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 0;
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}

.nav-brand:hover {
    color: var(--accent);
}

.nav-logo {
    height: 2rem;
    width: 6.125rem;
    aspect-ratio: 526 / 172;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.nav-links a:not(.lang-btn) {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

.nav-links a:not(.lang-btn):hover {
    color: var(--text-primary);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

.lang-switcher {
    display: flex;
    gap: 0.25rem;
    margin-left: 0.5rem;
    padding-left: 1rem;
    border-left: 1px solid var(--border);
}

.lang-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    border-radius: 6px;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    background: transparent;
    transition: all 0.2s;
}

.lang-btn:hover {
    color: var(--text-primary);
    background: var(--bg-card);
}

.lang-btn.active {
    color: var(--accent);
    background: var(--bg-card);
}

/* Tool Tabs */
.tool-tabs {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 0;
}

.tab-content {
    display: flex;
    gap: 0;
    overflow-x: auto;
}

.tool-tab {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 1.25rem;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    border-bottom: 2px solid transparent;
    cursor: default;
    white-space: nowrap;
    transition: color 0.2s;
}

a.tool-tab {
    color: var(--text-primary);
    cursor: pointer;
    text-decoration: none;
}

a.tool-tab:hover {
    color: var(--accent);
}

.tool-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.tool-tab.disabled {
    opacity: 0.6;
}

.tab-badge {
    font-size: 0.6rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 0.1rem 0.4rem;
    border-radius: 8px;
    background: var(--border);
    color: var(--text-muted);
}

/* Hero */
.hero {
    text-align: center;
    padding: 5rem 0 4rem;
    min-height: 380px;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent), #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-npcap {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--accent-hover);
    color: #fff;
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(74, 158, 255, 0.3);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
    transform: translateY(-1px);
}

.btn-donate {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 0.6rem 1.25rem;
}

.btn-donate:hover {
    background: var(--bg-card-hover);
    color: var(--accent);
    transform: translateY(-1px);
}

/* Sections */
.section {
    padding: 4rem 0;
}

.section-alt {
    background: var(--bg-secondary);
}

.section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 2rem;
    text-align: center;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.25rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    transition: all 0.2s;
}

.feature-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    font-size: 1.75rem;
    margin-bottom: 0.75rem;
}

.feature-card h3 {
    font-size: 1.05rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Coming Soon */
.feature-card.coming-soon-card {
    border-color: var(--accent);
    background: linear-gradient(135deg, var(--bg-card) 0%, #1a2348 100%);
}

.coming-soon-badge {
    display: inline-block;
    background: var(--accent);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    margin-bottom: 0.75rem;
}

/* Requirements */
.req-list {
    list-style: none;
    max-width: 600px;
    margin: 0 auto;
}

.req-list li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.req-list li:last-child {
    border-bottom: none;
}

/* Warning */
.warning-section {
    padding: 2rem 0;
}

.warning-box {
    background: var(--warning-bg);
    border: 1px solid var(--warning-border);
    border-radius: var(--radius);
    padding: 1.5rem 2rem;
    max-width: 700px;
    margin: 0 auto;
}

.warning-box h3 {
    color: var(--warning-border);
    margin-bottom: 0.75rem;
    font-size: 1rem;
}

.warning-box p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.warning-box p:last-child {
    margin-bottom: 0;
}

/* Links Grid */
.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    max-width: 800px;
    margin: 0 auto;
}

.link-card {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem 1.25rem;
    color: var(--text-primary);
    transition: all 0.2s;
}

.link-card:hover {
    background: var(--bg-card-hover);
    color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.link-icon {
    font-size: 1.5rem;
}

/* Support */
.support-desc {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.donate-grid {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Modals */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
}

.modal-overlay.open {
    display: flex;
}

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem 2rem;
    max-width: 520px;
    width: 90%;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.25rem;
}

.modal-header h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.crypto-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.crypto-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.crypto-name {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--accent);
}

.crypto-addr {
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: var(--bg-primary);
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    word-break: break-all;
    user-select: all;
}

.modal-sm {
    max-width: 280px;
}

.wechat-qr-wrap {
    text-align: center;
}

.wechat-qr {
    width: 200px;
    height: 200px;
    border-radius: var(--radius);
}

.wechat-inline {
    text-align: center;
    margin-top: 1.5rem;
}

.wechat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

/* Footer */
.footer {
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    text-align: center;
}

.footer p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-issues {
    margin-bottom: 0.5rem;
}

/* Mobile */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(10, 14, 39, 0.98);
        flex-direction: column;
        padding: 1rem 1.5rem;
        border-bottom: 1px solid var(--border);
        gap: 0.75rem;
    }

    .nav-links.open {
        display: flex;
    }

    .lang-switcher {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        padding-top: 0.5rem;
        border-top: 1px solid var(--border);
    }

    .hero {
        padding: 3rem 0 2.5rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero-desc {
        font-size: 1rem;
    }

    .section {
        padding: 3rem 0;
    }

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

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