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

:root {
    --bg-primary: #ffffff;
    --bg-card: #f5f5f5;
    --border-color: #e5e5e5;
    --text-primary: #0a0a0a;
    --text-secondary: #666666;
    --accent-color: #3b82f6;
    --font-mono: SF Mono, Consolas, monospace;
    --nav-height: 56px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-mono);
    background-color: var(--bg-primary);
    background-image:
        linear-gradient(rgba(0, 0, 0, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 0, 0, 0.05) 1px, transparent 1px);
    background-size: 40px 40px;
    color: var(--text-primary);
    line-height: 1.6;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 1000;
}

.nav-logo {
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links {
    display: flex;
    gap: 32px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    margin: 6px 0;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 24px;
    z-index: 999;
}

.mobile-menu.active {
    display: block;
}

.mobile-menu a {
    display: block;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
}

.mobile-menu a:last-child {
    border-bottom: none;
}

.mobile-menu a:hover {
    color: var(--text-primary);
}

/* Main Content */
main {
    padding-top: calc(var(--nav-height) + 48px);
    padding-bottom: 48px;
}

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 80px 0;
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 24px;
    letter-spacing: -1px;
}

.hero p {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
}

/* Features Section */
.section {
    padding: 64px 0;
}

.section-title {
    margin-bottom: 48px;
}

.section-title h2 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-title p {
    color: var(--text-secondary);
    font-size: 14px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background-color: var(--border-color);
    border: 1px solid var(--border-color);
}

.feature-card {
    background-color: var(--bg-primary);
    padding: 32px;
    transition: background-color 0.2s;
}

.feature-card:hover {
    background-color: var(--bg-card);
}

.feature-icon {
    font-size: 24px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* FAQ Section */
.faq-list {
    border: 1px solid var(--border-color);
}

.faq-item {
    border-bottom: 1px solid var(--border-color);
}

.faq-item:last-child {
    border-bottom: none;
}

.faq-question {
    width: 100%;
    background: none;
    border: none;
    padding: 24px;
    text-align: left;
    font-family: var(--font-mono);
    font-size: 14px;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question:hover {
    background-color: var(--bg-card);
}

.faq-icon {
    font-size: 18px;
    color: var(--text-secondary);
    transition: transform 0.2s;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    padding: 0 24px;
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.8;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 200px;
    padding: 0 24px 24px;
}

/* CTA Section */
.cta-section {
    text-align: center;
    padding: 80px 0;
}

.cta-section h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta-section p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 14px;
}

.beta-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
    align-items: center;
    margin-top: 40px;
}

.beta-item {
    text-align: center;
}

.beta-item h3 {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.beta-item p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* Footer */
.footer {
    padding: 48px 0 24px;
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
}

.footer-bottom p {
    font-size: 12px;
    color: var(--text-secondary);
}

/* Bilibili Icon */
.bilibili-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: background-color 0.2s;
    margin-top: 12px;
}

.bilibili-icon:hover {
    background-color: var(--border-color);
}

.bilibili-icon svg {
    width: 20px;
    height: 20px;
    fill: var(--text-primary);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .nav-links {
        gap: 24px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hamburger {
        display: block;
    }

    .hero h1 {
        font-size: 32px;
    }

    .hero p {
        font-size: 16px;
    }

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

    .section {
        padding: 48px 0;
    }

    .hero {
        padding: 48px 0;
    }
}

@media (max-width: 480px) {
    .beta-info {
        gap: 16px;
    }
}