/*
 * Sogou输入法官网 - 主样式表
 * 版本: 1.0.0
 * 更新日期: 2026-04-08
 */

/* ========== CSS变量定义 ========== */
:root {
    --primary-color: #ff6b35;
    --primary-dark: #e55a2b;
    --primary-light: #ff8c5a;
    --secondary-color: #2d3748;
    --accent-color: #4299e1;
    --success-color: #48bb78;
    --warning-color: #ed8936;
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-muted: #718096;
    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --bg-tertiary: #edf2f7;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --max-width: 1200px;
    --header-height: 72px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ========== 通用工具类 ========== */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-subtitle {
    font-size: 1.125rem;
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 48px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

/* ========== 按钮样式 ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(255, 107, 53, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 53, 0.5);
}

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

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

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

.btn-lg {
    padding: 16px 36px;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

/* ========== 头部导航 ========== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: box-shadow var(--transition-normal);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

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

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

.logo img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--text-primary);
}

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

.nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 18px;
    font-size: 1.0625rem;
    font-weight: 420;
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
    background: rgba(255, 107, 53, 0.08);
}

.nav-link i {
    font-size: 1.125rem;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mobile-menu-btn {
    display: none;
    padding: 8px;
    font-size: 1.5rem;
    color: var(--text-primary);
}

/* ========== 移动端导航 ========== */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        width: 100%;
        padding: 14px 20px;
        font-size: 1.125rem;
    }

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

    .header-actions .btn {
        display: none;
    }
}

/* ========== 页脚样式 ========== */
.footer {
    background: var(--secondary-color);
    color: #ffffff;
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
    max-width: 320px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
}

.footer-logo img {
    height: 36px;
    filter: brightness(0) invert(1);
}

.footer-logo span {
    font-size: 1.25rem;
    font-weight: 700;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.8;
    margin-bottom: 24px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: #ffffff;
    font-size: 1.125rem;
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

.footer-column h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 24px;
    color: #ffffff;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    padding: 24px 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 16px;
}

.copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

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

.footer-legal a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

.footer-legal a:hover {
    color: #ffffff;
}

@media (max-width: 768px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* ========== Hero区域 ========== */
.hero {
    padding-top: calc(var(--header-height) + 60px);
    padding-bottom: 80px;
    background: linear-gradient(135deg, #fff5f0 0%, #ffffff 50%, #f0f7ff 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: radial-gradient(circle, rgba(255, 107, 53, 0.08) 0%, transparent 70%);
    pointer-events: none;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 560px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: rgba(255, 107, 53, 0.1);
    color: var(--primary-color);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 50px;
    margin-bottom: 24px;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.hero-title span {
    color: var(--primary-color);
}

.hero-desc {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 32px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    gap: 40px;
}

.stat-item {
    text-align: left;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.hero-image {
    position: relative;
}

.hero-image img {
    width: 100%;
    max-width: 520px;
    margin: 0 auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.15));
}

@media (max-width: 968px) {
    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-title {
        font-size: 2.25rem;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-image {
        order: -1;
    }
}

/* ========== 特性卡片 ========== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.feature-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: all var(--transition-normal);
}

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

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, rgba(255, 107, 53, 0.1), rgba(255, 107, 53, 0.05));
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.feature-icon i {
    font-size: 1.75rem;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== 平台下载区 ========== */
.platforms {
    background: var(--bg-secondary);
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.platform-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
}

.platform-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.platform-icon {
    font-size: 3rem;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.platform-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.platform-card .version {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

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

@media (max-width: 480px) {
    .platforms-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== 功能展示区 ========== */
.showcase {
    position: relative;
}

.showcase-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 80px;
}

.showcase-item:last-child {
    margin-bottom: 0;
}

.showcase-item.reverse {
    direction: rtl;
}

.showcase-item.reverse > * {
    direction: ltr;
}

.showcase-content h3 {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.showcase-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.showcase-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.showcase-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
}

.showcase-list li i {
    color: var(--success-color);
    font-size: 1.25rem;
}

.showcase-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

@media (max-width: 768px) {
    .showcase-item,
    .showcase-item.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }

    .showcase-image {
        order: -1;
    }
}

/* ========== 用户评价 ========== */
.testimonials {
    background: var(--bg-secondary);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.testimonial-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
}

.testimonial-content {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
    position: relative;
}

.testimonial-content::before {
    content: '"';
    font-size: 4rem;
    color: var(--primary-color);
    opacity: 0.2;
    position: absolute;
    top: -20px;
    left: -10px;
    font-family: Georgia, serif;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.testimonial-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--bg-tertiary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    color: var(--text-muted);
}

.testimonial-info h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.testimonial-info span {
    font-size: 0.875rem;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
}

/* ========== FAQ区域 ========== */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
    overflow: hidden;
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 20px 24px;
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-primary);
    text-align: left;
    transition: background var(--transition-fast);
}

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

.faq-question i {
    font-size: 1.25rem;
    color: var(--text-muted);
    transition: transform var(--transition-fast);
}

.faq-item.active .faq-question i {
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 24px;
    max-height: 0;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.faq-item.active .faq-answer {
    padding: 0 24px 20px;
    max-height: 500px;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ========== CTA区域 ========== */
.cta {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: #ffffff;
    text-align: center;
}

.cta-content {
    max-width: 600px;
    margin: 0 auto;
}

.cta h2 {
    font-size: 2.25rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta p {
    font-size: 1.125rem;
    opacity: 0.9;
    margin-bottom: 32px;
}

.cta .btn-primary {
    background: #ffffff;
    color: var(--primary-color);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2);
}

.cta .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

/* ========== 下载页面样式 ========== */
.download-hero {
    padding-top: calc(var(--header-height) + 40px);
    padding-bottom: 60px;
    background: linear-gradient(135deg, #fff5f0 0%, #ffffff 100%);
}

.download-hero-inner {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.download-hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.download-hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

.download-section {
    padding: 60px 0;
}

.download-main {
    background: var(--bg-primary);
    border: 2px solid var(--primary-color);
    border-radius: var(--radius-xl);
    padding: 48px;
    margin-bottom: 48px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.download-main-info h2 {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.download-main-info h2 i {
    color: var(--primary-color);
}

.download-main-info p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    line-height: 1.8;
}

.download-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 24px;
    margin-bottom: 24px;
}

.download-meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9375rem;
    color: var(--text-muted);
}

.download-meta-item i {
    color: var(--primary-color);
}

.download-main-image {
    text-align: center;
}

.download-main-image img {
    max-width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.other-platforms h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 24px;
    text-align: center;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.download-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
    transition: all var(--transition-normal);
}

.download-card:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.download-card-icon {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.download-card h4 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.download-card .version {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.download-card .size {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    .download-main {
        grid-template-columns: 1fr;
        padding: 32px;
    }

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

/* ========== 功能页面样式 ========== */
.page-hero {
    padding-top: calc(var(--header-height) + 40px);
    padding-bottom: 60px;
    background: linear-gradient(135deg, #fff5f0 0%, #ffffff 100%);
    text-align: center;
}

.page-hero h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 16px;
}

.page-hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.feature-detail {
    padding: 80px 0;
    border-bottom: 1px solid var(--border-color);
}

.feature-detail:last-child {
    border-bottom: none;
}

.feature-detail-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.feature-detail.reverse .feature-detail-inner {
    direction: rtl;
}

.feature-detail.reverse .feature-detail-inner > * {
    direction: ltr;
}

.feature-detail-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.feature-detail-content h2 i {
    color: var(--primary-color);
}

.feature-detail-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
}

.feature-detail-list {
    display: grid;
    gap: 16px;
}

.feature-detail-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.feature-detail-list li i {
    color: var(--success-color);
    font-size: 1.25rem;
    margin-top: 2px;
}

.feature-detail-list li span {
    color: var(--text-secondary);
}

.feature-detail-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

@media (max-width: 768px) {
    .feature-detail-inner,
    .feature-detail.reverse .feature-detail-inner {
        grid-template-columns: 1fr;
        direction: ltr;
    }

    .feature-detail-image {
        order: -1;
    }
}

/* ========== 指南页面样式 ========== */
.guide-nav {
    background: var(--bg-secondary);
    padding: 20px 0;
    position: sticky;
    top: var(--header-height);
    z-index: 100;
    border-bottom: 1px solid var(--border-color);
}

.guide-nav-inner {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 4px;
}

.guide-nav-link {
    padding: 10px 20px;
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--text-secondary);
    background: var(--bg-primary);
    border-radius: var(--radius-md);
    white-space: nowrap;
    transition: all var(--transition-fast);
}

.guide-nav-link:hover,
.guide-nav-link.active {
    color: var(--primary-color);
    background: rgba(255, 107, 53, 0.1);
}

.guide-section {
    padding: 60px 0;
    border-bottom: 1px solid var(--border-color);
}

.guide-section:last-child {
    border-bottom: none;
}

.guide-section h2 {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.guide-section h2 i {
    color: var(--primary-color);
}

.guide-steps {
    display: grid;
    gap: 24px;
}

.guide-step {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 20px;
    padding: 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    color: #ffffff;
    font-size: 1.25rem;
    font-weight: 700;
    border-radius: 50%;
}

.step-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.step-content p {
    color: var(--text-secondary);
    line-height: 1.7;
}

.guide-tips {
    background: rgba(255, 107, 53, 0.05);
    border: 1px solid rgba(255, 107, 53, 0.2);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-top: 32px;
}

.guide-tips h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--primary-color);
}

.guide-tips ul {
    display: grid;
    gap: 12px;
}

.guide-tips li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    color: var(--text-secondary);
}

.guide-tips li i {
    color: var(--primary-color);
    margin-top: 4px;
}

/* ========== 关于页面样式 ========== */
.about-intro {
    padding: 80px 0;
}

.about-intro-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-intro-content h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.about-intro-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 16px;
}

.about-intro-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.about-stats {
    background: var(--bg-secondary);
    padding: 60px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.stat-card {
    text-align: center;
    padding: 32px;
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.stat-card i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.stat-card .number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.stat-card .label {
    color: var(--text-muted);
}

.about-timeline {
    padding: 80px 0;
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: var(--border-color);
}

.timeline-item {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 32px;
    margin-bottom: 48px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-content {
    padding: 24px;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

.timeline-item:nth-child(odd) .timeline-content {
    grid-column: 1;
    text-align: right;
}

.timeline-item:nth-child(even) .timeline-content {
    grid-column: 3;
}

.timeline-dot {
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    grid-column: 2;
    align-self: center;
    position: relative;
    z-index: 1;
}

.timeline-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.timeline-content .year {
    font-size: 0.875rem;
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 8px;
}

.timeline-content p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

@media (max-width: 768px) {
    .about-intro-inner {
        grid-template-columns: 1fr;
    }

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

    .timeline::before {
        left: 20px;
    }

    .timeline-item {
        grid-template-columns: auto 1fr;
        gap: 20px;
    }

    .timeline-item:nth-child(odd) .timeline-content,
    .timeline-item:nth-child(even) .timeline-content {
        grid-column: 2;
        text-align: left;
    }

    .timeline-dot {
        grid-column: 1;
    }
}

/* ========== 面包屑导航 ========== */
.breadcrumb {
    padding: 16px 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb-list {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
}

.breadcrumb-list a {
    color: var(--text-muted);
}

.breadcrumb-list a:hover {
    color: var(--primary-color);
}

.breadcrumb-list span {
    color: var(--text-muted);
}

.breadcrumb-list .current {
    color: var(--text-primary);
    font-weight: 500;
}

/* ========== 返回顶部按钮 ========== */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    background: var(--primary-color);
    color: #ffffff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* ========== 加载动画 ========== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.6s ease forwards;
}

/* ========== 打印样式 ========== */
@media print {
    .header,
    .footer,
    .back-to-top {
        display: none;
    }

    body {
        font-size: 12pt;
    }

    .section {
        padding: 20px 0;
    }
}