/* Reset & Base Styles */

/* 左右悬浮广告 */
.side-ad {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    width: 100px;
    background: linear-gradient(180deg, #f59e0b 0%, #ef4444 100%);
    border-radius: 12px;
    padding: 20px 15px;
    text-align: center;
    z-index: 999;
    box-shadow: 0 6px 25px rgba(245, 158, 11, 0.5);
    transition: transform 0.3s, box-shadow 0.3s;
    cursor: pointer;
    border: 2px solid rgba(255, 255, 255, 0.2);
}
.side-ad:hover {
    transform: translateY(-50%) scale(1.05);
    box-shadow: 0 10px 35px rgba(245, 158, 11, 0.7);
    border-color: rgba(255, 255, 255, 0.4);
}
.side-ad-left {
    left: 15px;
}
.side-ad-right {
    right: 15px;
}
.side-ad a {
    color: #ffffff;
    text-decoration: none;
    font-weight: 700;
    font-size: 16px;
    display: block;
    line-height: 1.6;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.3);
}
.side-ad a:hover {
    text-decoration: none;
}
.side-ad span {
    font-size: 32px;
    display: block;
    margin-bottom: 8px;
    line-height: 1;
}

/* 移动端隐藏悬浮广告 */
@media (max-width: 768px) {
    .side-ad {
        display: none;
    }
}

/* 广告横幅 */
.promo-banner {
    background: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    padding: 14px 0;
    text-align: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1001;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}
.promo-banner .container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}
.promo-banner a {
    color: #ffffff;
    font-weight: 600;
    text-decoration: none;
    transition: opacity 0.2s;
}
.promo-banner a:hover {
    opacity: 0.8;
    text-decoration: underline;
}
.promo-banner span {
    font-weight: 600;
    color: #ffffff;
}

/* 调整 navbar 位置，避免被广告横幅遮挡 */
.navbar {
    top: 52px;
}

/* 调整 hero section 的上边距 */
.hero {
    padding-top: 120px;
}

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

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-card: #16161f;
    --bg-hover: #1e1e2a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #6b6b7b;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-cyan: #06b6d4;
    --border-color: rgba(255, 255, 255, 0.1);
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-cyan: linear-gradient(135deg, #06b6d4 0%, #3b82f6 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.4);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 52px;
    left: 0;
    right: 0;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    padding: 16px 0;
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text-primary);
}

.logo-emoji {
    font-size: 28px;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.nav-link.github {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: all 0.2s ease;
}

.nav-link.github:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 160px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
    transform: translate(-50%, -50%);
    pointer-events: none;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 50px;
    font-size: 14px;
    color: var(--accent-primary);
    margin-bottom: 24px;
}

.hero-title {
    font-size: 64px;
    font-weight: 800;
    margin-bottom: 16px;
    line-height: 1.1;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 24px;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 16px;
}

.hero-description {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 60px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(99, 102, 241, 0.4);
}

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

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 60px;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 14px;
    color: var(--text-muted);
}

/* Section Styles */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 50px;
    font-size: 14px;
    color: var(--accent-primary);
    margin-bottom: 16px;
}

.section-title {
    font-size: 42px;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
}

/* What Is Section */
.what-is {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 40px;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Skills Section */
.skills {
    padding: 100px 0;
    background: var(--bg-primary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.skill-category {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
}

.skill-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 20px 24px;
    background: rgba(99, 102, 241, 0.05);
    border-bottom: 1px solid var(--border-color);
}

.skill-icon {
    font-size: 24px;
}

.skill-header h3 {
    font-size: 16px;
    font-weight: 600;
    flex: 1;
    color: var(--text-primary);
}

.skill-count {
    padding: 4px 10px;
    background: var(--bg-hover);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent-primary);
}

.skill-list {
    padding: 8px;
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 12px 16px;
    border-radius: 8px;
    text-decoration: none;
    transition: background 0.2s ease;
}

.skill-item:hover {
    background: var(--bg-hover);
}

.skill-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    font-family: 'SF Mono', monospace;
}

.skill-desc {
    font-size: 13px;
    color: var(--text-muted);
}

.skills-footer {
    text-align: center;
    padding: 32px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
}

.skills-footer p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.skills-footer code {
    display: inline-block;
    padding: 12px 20px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: 'SF Mono', monospace;
    font-size: 14px;
    color: var(--accent-cyan);
}

/* Guide Section */
.guide {
    padding: 100px 0;
    background: var(--bg-secondary);
}

.guide-steps {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.guide-step {
    display: flex;
    gap: 24px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    transition: all 0.3s ease;
}

.guide-step:hover {
    border-color: var(--accent-primary);
}

.step-number {
    width: 48px;
    height: 48px;
    background: var(--gradient-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    font-weight: 700;
    color: white;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-content h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.step-content p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.step-example {
    display: flex;
    align-items: center;
    gap: 12px;
}

.tag {
    padding: 4px 10px;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.2);
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    color: var(--accent-cyan);
}

.step-example code {
    padding: 8px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-family: 'SF Mono', monospace;
    font-size: 14px;
    color: var(--text-secondary);
}

/* Contact Section */
.contact {
    padding: 100px 0;
    background: var(--bg-primary);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.contact-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    transition: all 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.contact-card h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.contact-card p {
    font-size: 15px;
    color: var(--text-secondary);
    margin-bottom: 16px;
}

.contact-status {
    display: inline-block;
    padding: 6px 14px;
    background: var(--bg-hover);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.contact-status.online {
    background: rgba(34, 197, 94, 0.1);
    color: #22c55e;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-brand .logo-emoji {
    font-size: 24px;
}

.footer-brand .logo-text {
    font-size: 20px;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

.footer-copyright {
    font-size: 14px;
    color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-title {
        font-size: 42px;
    }
    
    .hero-subtitle {
        font-size: 20px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 30px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .guide-step {
        flex-direction: column;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}

/* Smooth scroll offset for fixed navbar */
html {
    scroll-padding-top: 80px;
}


/* 小龙虾养殖专题 */
.crayfish-section {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}
.crayfish-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.crayfish-intro h3 {
    font-size: 28px;
    margin-bottom: 24px;
    color: var(--text-primary);
}
.feature-list {
    list-style: none;
}
.feature-list li {
    padding: 12px 0;
    font-size: 16px;
    line-height: 1.8;
    color: var(--text-secondary);
}
.feature-list strong {
    color: var(--accent-cyan);
}
.crayfish-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    transition: transform 0.3s, border-color 0.3s;
}
.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-primary);
}
.stat-icon {
    font-size: 36px;
    margin-bottom: 12px;
}
.stat-value {
    font-size: 42px;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}
.stat-label {
    font-size: 14px;
    color: var(--text-muted);
}

@media (max-width: 968px) {
    .crayfish-content {
        grid-template-columns: 1fr;
    }
    .crayfish-stats {
        grid-template-columns: repeat(2, 1fr);
    }
}