/* ========== 全局样式重置 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: #F8FAFC;
    color: #1E293B;
    line-height: 1.6;
}

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

/* ========== 配色变量 ========== */
:root {
    --primary: #3B82F6;
    --primary-dark: #2563EB;
    --secondary: #10B981;
    --bg-light: #F8FAFC;
    --bg-white: #FFFFFF;
    --text-primary: #1E293B;
    --text-secondary: #64748B;
    --border-color: #E2E8F0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --transition: 300ms ease;
}

/* ========== 导航栏 ========== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.navbar.scrolled {
    border-bottom-color: var(--border-color);
    box-shadow: var(--shadow);
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

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

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

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

.nav-links a {
    font-size: 0.95rem;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

.nav-links a:hover::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* ========== Hero 区域 ========== */
.hero {
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding-top: 64px;
}

.hero-content {
    text-align: center;
    color: white;
    padding: 40px 24px;
}

.hero-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-content p {
    font-size: 1.2rem;
    opacity: 0.9;
}

/* ========== 通用区块样式 ========== */
.section {
    padding: 80px 24px;
}

.section-alt {
    background: white;
}

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

.section-title {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 40px;
    text-align: center;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 4px;
    background: var(--primary);
    margin: 12px auto 0;
    border-radius: 2px;
}

/* ========== 卡片网格 ========== */
.card-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.card {
    background: var(--bg-white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border-color);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.card-image {
    aspect-ratio: 4/3;
    overflow: hidden;
}

.placeholder-image {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #e0e7ff 0%, #c7d2fe 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.miniprogram-placeholder {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
}

.miniprogram-placeholder svg {
    width: 48px;
    height: 48px;
    color: var(--secondary);
}

.card-content {
    padding: 20px;
}

.card-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.card-content p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.qr-hint {
    display: inline-block;
    margin-top: 12px;
    font-size: 0.85rem;
    color: var(--primary);
    font-weight: 500;
}

/* ========== 工具列表 ========== */
.tool-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.tool-card {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 24px;
    background: var(--bg-light);
    border-radius: var(--radius);
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.tool-card:hover {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    transform: translateX(8px);
}

.tool-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.tool-icon svg {
    width: 28px;
    height: 28px;
    color: white;
}

.tool-info {
    flex: 1;
}

.tool-info h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.tool-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.tool-arrow {
    font-size: 1.5rem;
    color: var(--text-secondary);
    transition: var(--transition);
}

.tool-card:hover .tool-arrow {
    color: var(--primary);
    transform: translateX(4px);
}

/* ========== 页脚 ========== */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 40px 24px;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer p {
    opacity: 0.8;
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: white;
    opacity: 0.8;
    font-size: 0.9rem;
    transition: var(--transition);
}

.footer-links a:hover {
    opacity: 1;
}

/* ========== 响应式设计 ========== */
@media (max-width: 1023px) {
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 767px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero-content h1 {
        font-size: 1.8rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .section {
        padding: 60px 16px;
    }

    .section-title {
        font-size: 1.5rem;
        margin-bottom: 32px;
    }

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

    .tool-card {
        padding: 16px;
        gap: 16px;
    }

    .tool-icon {
        width: 48px;
        height: 48px;
    }

    .footer-container {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}