/* ===== 基础重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --secondary: #0ea5e9;
    --accent: #f59e0b;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    color: var(--secondary);
    text-decoration: none;
    transition: color 0.3s;
}

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

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 12px 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    transition: color 0.3s;
}

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

.nav-links {
    display: flex;
    gap: 24px;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s;
}

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

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

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-dark);
        flex-direction: column;
        padding: 20px;
        gap: 16px;
        border-bottom: 1px solid var(--border-color);
    }
    .nav-links.active {
        display: flex;
    }
}

/* ===== Hero ===== */
.hero {
    padding: 140px 0 80px;
    text-align: center;
    background: radial-gradient(ellipse at center, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
}

.hero h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 16px;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.stat {
    color: var(--text-secondary);
    font-size: 1rem;
}

.stat strong {
    display: block;
    font-size: 2rem;
    color: var(--accent);
}

/* ===== 搜索区域 ===== */
.search-section {
    padding: 40px 0 60px;
}

.search-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.search-box input {
    width: 100%;
    max-width: 600px;
    padding: 16px 24px;
    font-size: 1.1rem;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    background: var(--bg-card);
    color: var(--text-primary);
    outline: none;
    transition: border-color 0.3s;
}

.search-box input:focus {
    border-color: var(--primary);
}

.search-box input::placeholder {
    color: var(--text-secondary);
}

.search-tags {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.hot-tag {
    display: inline-block;
    padding: 4px 12px;
    margin: 4px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.85rem;
}

.hot-tag:hover {
    background: var(--primary);
    border-color: var(--primary);
    color: white;
}

.search-results {
    width: 100%;
    max-width: 600px;
    margin: 20px auto 0;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.search-result-item {
    padding: 16px 20px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: background 0.2s;
}

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

.search-result-item:hover {
    background: var(--bg-card-hover);
}

.result-category {
    font-size: 0.75rem;
    color: var(--secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.result-title {
    font-size: 1rem;
    font-weight: 600;
    margin: 4px 0;
}

.result-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ===== 按钮 ===== */
.btn {
    display: inline-block;
    padding: 12px 28px;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.3s;
    text-align: center;
}

.btn-primary {
    background: var(--gradient);
    color: white;
}

.btn-primary:hover {
    opacity: 0.9;
    color: white;
}

.btn-outline {
    background: transparent;
    border-color: var(--primary);
    color: var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: white;
}

/* ===== 分类板块 ===== */
.categories-section {
    padding: 60px 0;
}

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 40px;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
}

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px 24px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
}

.category-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 8px 30px rgba(99, 102, 241, 0.2);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 12px;
}

.category-card h3 {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.category-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.category-count {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(99, 102, 241, 0.15);
    color: var(--primary);
    border-radius: 20px;
    font-size: 0.8rem;
}

/* ===== 免费资源 ===== */
.free-resources-section {
    padding: 60px 0;
    background: rgba(30, 41, 59, 0.5);
}

.resource-tabs {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 32px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 10px 24px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-card);
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.3s;
}

.tab-btn.active,
.tab-btn:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

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

.resource-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s;
}

.resource-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.resource-thumb {
    height: 160px;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
}

.resource-info {
    padding: 20px;
}

.resource-info h4 {
    margin-bottom: 8px;
    font-size: 1.1rem;
}

.resource-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.resource-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.free-badge {
    padding: 2px 8px;
    background: rgba(14, 165, 233, 0.2);
    color: var(--secondary);
    border-radius: 4px;
}

/* ===== VIP 专属 ===== */
.premium-section {
    padding: 60px 0;
}

.section-desc {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 40px;
    font-size: 1.1rem;
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    max-width: 960px;
    margin: 0 auto;
}

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

.pricing-card:hover {
    transform: translateY(-4px);
}

.pricing-card.featured {
    border-color: var(--accent);
    box-shadow: 0 0 40px rgba(245, 158, 11, 0.15);
}

.badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    padding: 4px 16px;
    background: var(--accent);
    color: var(--bg-dark);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.price {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent);
    margin: 16px 0;
}

.price span {
    font-size: 1rem;
    color: var(--text-secondary);
}

.features {
    list-style: none;
    text-align: left;
    margin: 24px 0;
}

.features li {
    padding: 8px 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* ===== 联系方式 ===== */
.contact-section {
    padding: 60px 0;
    background: rgba(30, 41, 59, 0.5);
}

.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;
}

.contact-icon {
    font-size: 2.5rem;
    margin-bottom: 12px;
}

.contact-card h3 {
    margin-bottom: 8px;
}

.contact-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.qr-placeholder,
.qq-info,
.email-info {
    padding: 20px;
    background: var(--bg-dark);
    border-radius: 8px;
}

.qr-placeholder span {
    display: block;
    font-size: 1.5rem;
    margin-bottom: 4px;
}

.qq-number,
.email-address {
    display: block;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 4px;
}

/* ===== 关于 ===== */
.about-section {
    padding: 60px 0;
}

.about-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    color: var(--text-secondary);
    margin-bottom: 16px;
    font-size: 1.05rem;
}

.about-content ul {
    text-align: left;
    list-style: none;
    margin-top: 24px;
}

.about-content li {
    padding: 8px 0;
    color: var(--text-secondary);
}

.about-content li::before {
    content: "→ ";
    color: var(--primary);
}

/* ===== Footer ===== */
.footer {
    padding: 32px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-note {
    margin-top: 8px;
    font-size: 0.8rem;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2rem;
    }
    .hero p {
        font-size: 1rem;
    }
    .hero-stats {
        gap: 20px;
    }
    .section-title {
        font-size: 1.5rem;
    }
    .category-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .resources-grid {
        grid-template-columns: 1fr;
    }
}