/* ===== Design Tokens ===== */
:root {
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --color-bg: #0a0a0f;
    --color-surface: #12121a;
    --color-surface-hover: #1a1a25;
    --color-border: rgba(255, 255, 255, 0.06);
    --color-text: #e8e8ed;
    --color-text-secondary: #8e8e9a;
    --color-text-muted: #5a5a6a;
    --color-accent: #7c5cfc;
    --color-accent-light: #9b7fff;
    --color-gradient-start: #7c5cfc;
    --color-gradient-end: #e040fb;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --shadow-card: 0 4px 24px rgba(0, 0, 0, 0.3);
    --max-width: 1080px;
}

/* ===== Reset ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
a {
    color: var(--color-accent-light);
    text-decoration: none;
    transition: color 0.2s;
}
a:hover { color: var(--color-gradient-end); }

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Navbar ===== */
.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}
.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text);
    font-weight: 600;
    font-size: 1.1rem;
}
.logo:hover { color: var(--color-text); }
.logo-icon { font-size: 1.3rem; }
.nav-links { display: flex; gap: 24px; }
.nav-links a {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--color-text); }

/* ===== Hero ===== */
.hero {
    padding: 80px 0 60px;
    text-align: center;
    background: radial-gradient(ellipse 70% 50% at 50% 0%, rgba(124, 92, 252, 0.08), transparent);
}
.hero h1 {
    font-size: clamp(2.5rem, 6vw, 3.8rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}
.text-gradient {
    background: linear-gradient(135deg, var(--color-gradient-start), var(--color-gradient-end));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    max-width: 480px;
    margin: 0 auto;
}

/* ===== Features ===== */
.features { padding: 60px 0; }
.features h2 {
    font-size: 1.6rem;
    font-weight: 600;
    margin-bottom: 32px;
    text-align: center;
}
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}
.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 28px 24px;
    transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(124, 92, 252, 0.2);
    box-shadow: var(--shadow-card);
}
.feature-icon {
    font-size: 1.8rem;
    margin-bottom: 14px;
}
.feature-card h3 {
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 8px;
}
.feature-card p {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== Support ===== */
.support { padding: 60px 0 80px; }
.support h2 {
    font-size: 1.6rem;
    font-weight: 600;
    margin-bottom: 32px;
    text-align: center;
}
.support-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}
.support-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 28px;
}
.support-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 16px;
}
.faq-list { display: flex; flex-direction: column; gap: 8px; }
.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    transition: border-color 0.2s;
}
.faq-item[open] { border-color: rgba(124, 92, 252, 0.2); }
.faq-item summary {
    padding: 14px 16px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.faq-item summary::after {
    content: '+';
    font-size: 1.2rem;
    color: var(--color-text-muted);
    transition: transform 0.2s;
}
.faq-item[open] summary::after {
    content: '−';
    color: var(--color-accent-light);
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item p {
    padding: 0 16px 14px;
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 12px;
}
.contact-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
}
.contact-icon { font-size: 1.1rem; }
.support-card > p {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ===== Privacy Page ===== */
.privacy-page { padding: 40px 0 80px; }
.privacy-content {
    max-width: 720px;
    margin: 0 auto;
}
.privacy-content h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
}
.last-updated {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-bottom: 40px;
}
.privacy-content section {
    margin-bottom: 36px;
}
.privacy-content h2 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--color-border);
}
.privacy-content h3 {
    font-size: 1rem;
    font-weight: 600;
    margin: 16px 0 8px;
    color: var(--color-text);
}
.privacy-content p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}
.privacy-content ul {
    padding-left: 20px;
    margin-bottom: 8px;
}
.privacy-content li {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    margin-bottom: 6px;
}
.privacy-content strong { color: var(--color-text); }

.permissions-table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0;
    font-size: 0.9rem;
}
.permissions-table th,
.permissions-table td {
    text-align: left;
    padding: 10px 14px;
    border: 1px solid var(--color-border);
}
.permissions-table th {
    background: var(--color-surface);
    font-weight: 600;
    color: var(--color-text);
}
.permissions-table td {
    color: var(--color-text-secondary);
}

/* ===== Footer ===== */
.footer {
    border-top: 1px solid var(--color-border);
    padding: 24px 0;
}
.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.82rem;
    color: var(--color-text-muted);
}
.footer-links { display: flex; gap: 20px; }
.footer-links a {
    color: var(--color-text-muted);
    font-size: 0.82rem;
}
.footer-links a:hover { color: var(--color-text-secondary); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .support-content {
        grid-template-columns: 1fr;
    }
    .hero { padding: 50px 0 40px; }
    .features { padding: 40px 0; }
}
@media (max-width: 480px) {
    .footer-content {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }
}