/* ===== 全局重置 & 变量 ===== */
:root {
    --primary: #07c160;
    --primary-dark: #06ad56;
    --primary-light: #e8f8ee;
    --bg: #f5f5f5;
    --card-bg: #ffffff;
    --text: #1a1a1a;
    --text-secondary: #666;
    --text-light: #999;
    --border: #e5e5e5;
    --shadow: 0 2px 12px rgba(0,0,0,0.06);
    --shadow-hover: 0 8px 30px rgba(0,0,0,0.12);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s cubic-bezier(.4,0,.2,1);
    --nav-height: 64px;
    --max-width: 1200px;
}

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

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

a {
    text-decoration: none;
    color: inherit;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: box-shadow var(--transition);
}

.navbar.scrolled {
    box-shadow: 0 2px 20px rgba(0,0,0,0.08);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-left .logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 1px;
}

.nav-center {
    display: flex;
    gap: 6px;
}

.nav-center a {
    padding: 8px 18px;
    border-radius: 30px;
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.nav-center a i {
    margin-right: 6px;
    font-size: 14px;
}

.nav-center a:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.nav-center a.active {
    background: var(--primary);
    color: #fff;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: var(--bg);
    border-radius: 50%;
    font-size: 18px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-btn:hover {
    background: var(--primary-light);
    color: var(--primary);
}

/* ===== 移动端菜单 ===== */
.mobile-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0,0,0,0.4);
    z-index: 2000;
    opacity: 0;
    transition: opacity var(--transition);
}

.mobile-overlay.active {
    display: block;
    opacity: 1;
}

.mobile-menu {
    position: fixed;
    top: 0;
    right: -280px;
    width: 280px;
    height: 100%;
    background: var(--card-bg);
    z-index: 2001;
    box-shadow: -4px 0 30px rgba(0,0,0,0.1);
    transition: right var(--transition);
    display: flex;
    flex-direction: column;
}

.mobile-menu.active {
    right: 0;
}

.menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

.menu-title {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
}

.close-btn {
    width: 36px;
    height: 36px;
    border: none;
    background: var(--bg);
    border-radius: 50%;
    font-size: 22px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background: #fee2e2;
    color: #ef4444;
}

.menu-list {
    list-style: none;
    padding: 12px 0;
    flex: 1;
    overflow-y: auto;
}

.menu-list li a {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 14px 24px;
    font-size: 16px;
    color: var(--text);
    transition: background var(--transition);
}

.menu-list li a i {
    width: 24px;
    text-align: center;
    color: var(--text-secondary);
}

.menu-list li a:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.menu-list li hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: 8px 20px;
}

/* ===== 英雄区 ===== */
.hero {
    background: linear-gradient(135deg, #07c160 0%, #06ad56 40%, #059669 100%);
    padding: 80px 20px 60px;
    text-align: center;
    color: #fff;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 50%, rgba(255,255,255,0.08) 0%, transparent 60%);
    animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { transform: translate(0,0); }
    100% { transform: translate(-10%, -10%); }
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.hero p {
    font-size: 20px;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.5;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 50px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 36px;
    font-weight: 800;
    line-height: 1.2;
}

.stat-label {
    font-size: 14px;
    opacity: 0.8;
    margin-top: 4px;
}

/* ===== 搜索区域 ===== */
.search-section {
    padding: 30px 20px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
}

.search-container {
    max-width: 700px;
    margin: 0 auto;
}

.search-box {
    display: flex;
    align-items: center;
    background: var(--bg);
    border-radius: 30px;
    padding: 0 20px;
    border: 2px solid transparent;
    transition: all var(--transition);
}

.search-box:focus-within {
    border-color: var(--primary);
    background: var(--card-bg);
    box-shadow: 0 0 0 4px rgba(7, 193, 96, 0.1);
}

.search-icon {
    color: var(--text-light);
    font-size: 16px;
    margin-right: 10px;
}

.search-box input {
    flex: 1;
    border: none;
    background: transparent;
    padding: 14px 0;
    font-size: 16px;
    outline: none;
    color: var(--text);
}

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

.search-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 14px;
    justify-content: center;
}

.tag {
    padding: 6px 16px;
    background: var(--primary-light);
    color: var(--primary);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

.tag:hover {
    background: var(--primary);
    color: #fff;
}

/* ===== 功能卡片 ===== */
.features {
    padding: 50px 0;
}

.section-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.section-title i {
    color: var(--primary);
}

.section-title .badge {
    background: var(--primary);
    color: #fff;
    font-size: 12px;
    font-weight: 600;
    padding: 2px 12px;
    border-radius: 12px;
    margin-left: 8px;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
}

.feature-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 28px 20px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    cursor: default;
    border: 1px solid transparent;
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 26px;
    color: var(--primary);
    transition: all var(--transition);
}

.feature-card:hover .card-icon {
    background: var(--primary);
    color: #fff;
    transform: scale(1.1);
}

.feature-card h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 8px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ===== 文章列表 ===== */
.articles {
    padding: 50px 0 70px;
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.article-card {
    display: flex;
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: all var(--transition);
    border: 1px solid transparent;
}

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

.article-img {
    width: 120px;
    min-height: 120px;
    background: var(--primary-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 40px;
    color: var(--primary);
    flex-shrink: 0;
}

.article-info {
    padding: 16px 20px;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.article-info h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 6px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-meta {
    font-size: 13px;
    color: var(--text-light);
    display: flex;
    gap: 16px;
    margin-bottom: 10px;
}

.article-meta span i {
    margin-right: 4px;
}

.read-more {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 500;
    color: var(--primary);
    transition: gap var(--transition);
}

.read-more:hover {
    gap: 10px;
}

/* ===== 空状态 ===== */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.empty-state i {
    font-size: 60px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state p {
    font-size: 16px;
}

/* ===== 底部 ===== */
.footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border);
    padding: 40px 20px;
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-bottom: 16px;
}

.footer-links a {
    font-size: 14px;
    color: var(--text-secondary);
    transition: color var(--transition);
}

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

.copyright {
    font-size: 13px;
    color: var(--text-light);
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    :root {
        --nav-height: 56px;
    }

    .nav-center {
        display: none;
    }

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

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

    .hero-stats {
        gap: 24px;
    }

    .stat-number {
        font-size: 28px;
    }

    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .article-img {
        width: 100px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 50px 16px 40px;
    }

    .hero h1 {
        font-size: 26px;
    }

    .section-title {
        font-size: 20px;
    }

    .feature-grid {
        grid-template-columns: 1fr 1fr;
        gap: 12px;
    }

    .feature-card {
        padding: 20px 14px;
    }

    .card-icon {
        width: 48px;
        height: 48px;
        font-size: 20px;
    }

    .feature-card h3 {
        font-size: 15px;
    }

    .article-card {
        flex-direction: column;
    }

    .article-img {
        width: 100%;
        height: 120px;
    }

    .article-info {
        padding: 14px;
    }
}