/* ============================================
   HD Tune 官方网站 - 主样式表
   配色基于品牌Logo：金橙色（硬盘盘片）+ 深黑色（硬盘外壳）
   风格：扁平、现代、专业
   ============================================ */

/* CSS 变量定义 */
:root {
    /* 品牌主色 - 基于Logo金橙色 */
    --primary: #FF8C00;
    --primary-dark: #E67E00;
    --primary-light: #FFA940;
    --primary-lighter: #FFD180;
    --primary-bg: #FFF8F0;
    
    /* 辅助色 - 基于Logo深黑色 */
    --dark: #1A1A1A;
    --dark-soft: #2C2C2C;
    --gray-900: #1A1A1A;
    --gray-700: #333333;
    --gray-600: #4A4A4A;
    --gray-500: #666666;
    --gray-400: #999999;
    --gray-300: #CCCCCC;
    --gray-200: #E5E5E5;
    --gray-100: #F5F5F5;
    --gray-50: #FAFAFA;
    
    /* 功能色 */
    --success: #52C41A;
    --warning: #FAAD14;
    --error: #FF4D4F;
    --info: #1890FF;
    
    /* 背景 */
    --bg-white: #FFFFFF;
    --bg-light: #FAFAFA;
    --bg-dark: #1A1A1A;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.16);
    --shadow-primary: 0 4px 16px rgba(255, 140, 0, 0.3);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s ease;
    
    /* 间距 */
    --container-max: 1200px;
    --header-height: 72px;
}

/* 重置样式 */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
        "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial,
        sans-serif;
    font-size: 16px;
    line-height: 1.7;
    color: var(--gray-700);
    background: var(--bg-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

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

ul,
ol {
    list-style: none;
}

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

/* 通用容器 */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

.container-sm {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 通用按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 16px;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    cursor: pointer;
    border: none;
    white-space: nowrap;
    text-align: center;
}

.btn-primary {
    background: var(--primary);
    color: #FFFFFF;
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover {
    background: var(--primary-dark);
    color: #FFFFFF;
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(255, 140, 0, 0.4);
}

.btn-secondary {
    background: var(--bg-white);
    color: var(--gray-700);
    border: 2px solid var(--gray-200);
}

.btn-secondary:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.btn-dark {
    background: var(--dark);
    color: #FFFFFF;
}

.btn-dark:hover {
    background: var(--dark-soft);
    color: #FFFFFF;
    transform: translateY(-2px);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 18px;
}

.btn-sm {
    padding: 8px 20px;
    font-size: 14px;
}

.btn-block {
    display: flex;
    width: 100%;
}

/* ============================================
   头部导航
   ============================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

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

.header-inner {
    max-width: var(--container-max);
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
    color: var(--dark);
    text-decoration: none;
}

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

.logo-icon {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
}

.logo-text {
    letter-spacing: -0.5px;
}

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

/* 主导航 */
.main-nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-list a {
    display: block;
    padding: 10px 18px;
    color: var(--gray-600);
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.nav-list a:hover {
    color: var(--primary);
    background: var(--primary-bg);
}

.nav-list a.active {
    color: var(--primary);
    background: var(--primary-bg);
}

.nav-cta {
    margin-left: 16px;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.menu-toggle:hover {
    background: var(--gray-100);
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    position: relative;
    transition: var(--transition);
}

.menu-toggle span::before,
.menu-toggle span::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--gray-700);
    border-radius: 2px;
    transition: var(--transition);
}

.menu-toggle span::before {
    top: -7px;
}

.menu-toggle span::after {
    top: 7px;
}

.menu-toggle.active span {
    background: transparent;
}

.menu-toggle.active span::before {
    top: 0;
    transform: rotate(45deg);
}

.menu-toggle.active span::after {
    top: 0;
    transform: rotate(-45deg);
}

/* ============================================
   首页 Hero 区域
   ============================================ */
.hero {
    position: relative;
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #FFF8F0 0%, #FFFFFF 50%, #FFF4E6 100%);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -100px;
    right: -100px;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 140, 0, 0.12) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -150px;
    left: -150px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 140, 0, 0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-inner {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    max-width: 580px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(255, 140, 0, 0.1);
    color: var(--primary-dark);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 24px;
}

.hero-badge .dot {
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: 52px;
    font-weight: 800;
    line-height: 1.15;
    color: var(--dark);
    letter-spacing: -1px;
    margin-bottom: 24px;
}

.hero-title .accent {
    color: var(--primary);
    position: relative;
}

.hero-title .accent::after {
    content: '';
    position: absolute;
    bottom: 4px;
    left: 0;
    right: 0;
    height: 8px;
    background: rgba(255, 140, 0, 0.2);
    z-index: -1;
    border-radius: 4px;
}

.hero-subtitle {
    font-size: 18px;
    line-height: 1.7;
    color: var(--gray-500);
    margin-bottom: 36px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--gray-200);
}

.hero-stat {
    display: flex;
    flex-direction: column;
}

.hero-stat-num {
    font-size: 32px;
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
    margin-bottom: 4px;
}

.hero-stat-label {
    font-size: 14px;
    color: var(--gray-500);
}

/* Hero 右侧视觉 */
.hero-visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-screen {
    width: 100%;
    max-width: 540px;
    background: var(--dark);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-xl);
    position: relative;
}

.hero-screen::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 8px;
    background: var(--gray-300);
    border-radius: 0 0 8px 8px;
}

.hero-screen-inner {
    background: #FFFFFF;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.hero-screen-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 12px 16px;
    background: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
}

.hero-screen-header .dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.hero-screen-header .dot.red { background: #FF5F57; }
.hero-screen-header .dot.yellow { background: #FEBC2E; }
.hero-screen-header .dot.green { background: #28C840; }

.hero-screen-title {
    margin-left: 12px;
    font-size: 13px;
    color: var(--gray-500);
    font-weight: 500;
}

.hero-screen-body {
    padding: 20px;
}

.benchmark-chart {
    height: 220px;
    background: linear-gradient(180deg, rgba(255, 140, 0, 0.05) 0%, transparent 100%);
    border-radius: var(--radius-sm);
    padding: 16px;
    position: relative;
    border: 1px solid var(--gray-200);
}

.benchmark-chart svg {
    width: 100%;
    height: 100%;
}

.benchmark-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-top: 16px;
}

.benchmark-info-item {
    padding: 12px;
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    text-align: center;
}

.benchmark-info-item .label {
    font-size: 12px;
    color: var(--gray-500);
    margin-bottom: 4px;
}

.benchmark-info-item .value {
    font-size: 16px;
    font-weight: 700;
    color: var(--primary);
}

/* ============================================
   通用 Section 样式
   ============================================ */
.section {
    padding: 96px 0;
}

.section-light {
    background: var(--bg-light);
}

.section-dark {
    background: var(--dark);
    color: #FFFFFF;
}

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 64px;
}

.section-eyebrow {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-bg);
    color: var(--primary-dark);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: 16px;
}

.section-dark .section-eyebrow {
    background: rgba(255, 140, 0, 0.15);
    color: var(--primary-light);
}

.section-title {
    font-size: 40px;
    font-weight: 800;
    line-height: 1.2;
    color: var(--dark);
    letter-spacing: -0.5px;
    margin-bottom: 16px;
}

.section-dark .section-title {
    color: #FFFFFF;
}

.section-subtitle {
    font-size: 17px;
    line-height: 1.7;
    color: var(--gray-500);
}

.section-dark .section-subtitle {
    color: rgba(255, 255, 255, 0.7);
}

/* ============================================
   功能特性卡片
   ============================================ */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.feature-card {
    background: var(--bg-white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

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

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-bg);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
    color: var(--primary);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 15px;
    line-height: 1.7;
    color: var(--gray-500);
}

/* ============================================
   使用场景区域
   ============================================ */
.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.scenario-card {
    display: flex;
    gap: 24px;
    padding: 32px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}

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

.scenario-icon {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius-md);
    color: #FFFFFF;
}

.scenario-icon svg {
    width: 32px;
    height: 32px;
}

.scenario-content h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}

.scenario-content p {
    font-size: 15px;
    line-height: 1.7;
    color: var(--gray-500);
    margin-bottom: 12px;
}

.scenario-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.scenario-tag {
    padding: 4px 12px;
    background: var(--primary-bg);
    color: var(--primary-dark);
    font-size: 13px;
    font-weight: 500;
    border-radius: var(--radius-full);
}

/* ============================================
   用户评价区域
   ============================================ */
.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.testimonial-card {
    background: var(--bg-white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
    position: relative;
}

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

.testimonial-quote {
    font-size: 60px;
    line-height: 1;
    color: var(--primary-lighter);
    font-family: Georgia, serif;
    margin-bottom: -20px;
}

.testimonial-rating {
    display: flex;
    gap: 2px;
    margin-bottom: 16px;
    color: var(--primary);
}

.testimonial-rating svg {
    width: 18px;
    height: 18px;
}

.testimonial-text {
    font-size: 15px;
    line-height: 1.8;
    color: var(--gray-600);
    margin-bottom: 24px;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
    padding-top: 20px;
    border-top: 1px solid var(--gray-200);
}

.testimonial-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #FFFFFF;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    flex-shrink: 0;
}

.testimonial-info h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 2px;
}

.testimonial-info span {
    font-size: 13px;
    color: var(--gray-500);
}

/* ============================================
   CTA 区域
   ============================================ */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: #FFFFFF;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.cta-section::after {
    content: '';
    position: absolute;
    bottom: -50%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.cta-inner {
    position: relative;
    z-index: 1;
    max-width: 720px;
    margin: 0 auto;
    padding: 0 24px;
}

.cta-section h2 {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.cta-section p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 36px;
}

.cta-section .btn {
    background: #FFFFFF;
    color: var(--primary-dark);
    font-size: 18px;
    padding: 16px 40px;
}

.cta-section .btn:hover {
    background: var(--dark);
    color: #FFFFFF;
    transform: translateY(-2px);
}

/* ============================================
   页面横幅（内页）
   ============================================ */
.page-banner {
    padding: 140px 0 60px;
    background: linear-gradient(135deg, #FFF8F0 0%, #FFFFFF 100%);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 140, 0, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.page-banner h1 {
    position: relative;
    font-size: 44px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.page-banner p {
    position: relative;
    font-size: 18px;
    color: var(--gray-500);
    max-width: 640px;
    margin: 0 auto;
}

.breadcrumb {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 24px;
    font-size: 14px;
    color: var(--gray-500);
}

.breadcrumb a {
    color: var(--gray-500);
}

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

.breadcrumb .separator {
    color: var(--gray-300);
}

/* ============================================
   功能详情页样式
   ============================================ */
.feature-detail {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    margin-bottom: 96px;
}

.feature-detail:last-child {
    margin-bottom: 0;
}

.feature-detail.reverse .feature-detail-content {
    order: 2;
}

.feature-detail-content h2 {
    font-size: 32px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}

.feature-detail-content > p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--gray-500);
    margin-bottom: 24px;
}

.feature-detail-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 28px;
}

.feature-detail-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.6;
}

.feature-detail-list li .check {
    flex-shrink: 0;
    width: 22px;
    height: 22px;
    background: var(--primary-bg);
    color: var(--primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 2px;
}

.feature-detail-list li .check svg {
    width: 14px;
    height: 14px;
}

.feature-detail-visual {
    background: var(--gray-100);
    border-radius: var(--radius-lg);
    padding: 24px;
    min-height: 360px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-detail-visual .mockup {
    width: 100%;
    background: #FFFFFF;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

.mockup-header {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 14px;
    background: var(--gray-100);
    border-bottom: 1px solid var(--gray-200);
}

.mockup-header .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.mockup-header .dot.red { background: #FF5F57; }
.mockup-header .dot.yellow { background: #FEBC2E; }
.mockup-header .dot.green { background: #28C840; }

.mockup-body {
    padding: 20px;
}

.mockup-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
}

.mockup-chart {
    height: 180px;
    background: linear-gradient(180deg, rgba(255, 140, 0, 0.08) 0%, transparent 100%);
    border-radius: var(--radius-sm);
    border: 1px solid var(--gray-200);
    padding: 12px;
    margin-bottom: 16px;
}

.mockup-chart svg {
    width: 100%;
    height: 100%;
}

.mockup-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.mockup-stat {
    padding: 10px;
    background: var(--gray-50);
    border-radius: var(--radius-sm);
    text-align: center;
}

.mockup-stat .label {
    font-size: 11px;
    color: var(--gray-500);
}

.mockup-stat .value {
    font-size: 14px;
    font-weight: 700;
    color: var(--primary);
}

/* ============================================
   下载中心页面
   ============================================ */
.download-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
    margin-bottom: 64px;
}

.download-card {
    background: var(--bg-white);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 40px;
    transition: var(--transition);
    position: relative;
}

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

.download-card.recommended {
    border-color: var(--primary);
    background: linear-gradient(135deg, #FFF8F0 0%, #FFFFFF 100%);
}

.download-card.recommended::before {
    content: '推荐';
    position: absolute;
    top: -14px;
    left: 40px;
    padding: 4px 16px;
    background: var(--primary);
    color: #FFFFFF;
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-full);
}

.download-card .card-badge {
    display: inline-block;
    padding: 4px 12px;
    background: var(--gray-100);
    color: var(--gray-600);
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
}

.download-card.recommended .card-badge {
    background: var(--primary-bg);
    color: var(--primary-dark);
}

.download-card h3 {
    font-size: 28px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 8px;
}

.download-card .version {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 24px;
}

.download-card .price {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 24px;
}

.download-card .price small {
    font-size: 14px;
    color: var(--gray-500);
    font-weight: 400;
}

.download-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 32px;
}

.download-features li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 15px;
    color: var(--gray-600);
    line-height: 1.6;
}

.download-features li .check {
    flex-shrink: 0;
    width: 20px;
    height: 20px;
    background: var(--primary);
    color: #FFFFFF;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-top: 2px;
}

.download-features li .check svg {
    width: 12px;
    height: 12px;
}

.download-features li.disabled {
    color: var(--gray-400);
}

.download-features li.disabled .check {
    background: var(--gray-300);
}

.download-info-table {
    background: var(--bg-white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.download-info-table table {
    width: 100%;
    border-collapse: collapse;
}

.download-info-table th,
.download-info-table td {
    padding: 16px 24px;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.download-info-table th {
    background: var(--gray-50);
    font-weight: 600;
    color: var(--dark);
    font-size: 14px;
}

.download-info-table td {
    color: var(--gray-600);
    font-size: 15px;
}

.download-info-table tr:last-child th,
.download-info-table tr:last-child td {
    border-bottom: none;
}

/* ============================================
   使用教程页面
   ============================================ */
.guide-grid {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 48px;
    align-items: start;
}

.guide-sidebar {
    position: sticky;
    top: 100px;
    background: var(--bg-white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 24px;
}

.guide-sidebar h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--gray-200);
}

.guide-sidebar ul {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.guide-sidebar a {
    display: block;
    padding: 10px 14px;
    color: var(--gray-600);
    font-size: 14px;
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

.guide-sidebar a:hover,
.guide-sidebar a.active {
    background: var(--primary-bg);
    color: var(--primary);
    font-weight: 600;
}

.guide-content {
    min-width: 0;
}

.guide-section {
    margin-bottom: 64px;
    scroll-margin-top: 100px;
}

.guide-section h2 {
    font-size: 28px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--primary);
    display: inline-block;
}

.guide-section h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    margin: 24px 0 12px;
}

.guide-section p {
    font-size: 16px;
    line-height: 1.8;
    color: var(--gray-600);
    margin-bottom: 16px;
}

.guide-section ol,
.guide-section ul {
    margin: 0 0 16px 20px;
}

.guide-section ol li,
.guide-section ul li {
    font-size: 15px;
    line-height: 1.8;
    color: var(--gray-600);
    margin-bottom: 8px;
    list-style: disc;
}

.guide-section ol li {
    list-style: decimal;
}

.guide-note {
    background: var(--primary-bg);
    border-left: 4px solid var(--primary);
    padding: 16px 20px;
    border-radius: var(--radius-sm);
    margin: 20px 0;
}

.guide-note strong {
    color: var(--primary-dark);
}

/* ============================================
   关于我们页面
   ============================================ */
.about-content {
    max-width: 800px;
    margin: 0 auto;
}

.about-content p {
    font-size: 16px;
    line-height: 1.9;
    color: var(--gray-600);
    margin-bottom: 20px;
}

.about-content h2 {
    font-size: 28px;
    font-weight: 800;
    color: var(--dark);
    margin: 40px 0 16px;
}

.about-content h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark);
    margin: 24px 0 12px;
}

.timeline {
    max-width: 800px;
    margin: 48px auto;
    position: relative;
    padding-left: 32px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--gray-200);
}

.timeline-item {
    position: relative;
    padding-bottom: 32px;
}

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

.timeline-item::before {
    content: '';
    position: absolute;
    left: -28px;
    top: 6px;
    width: 12px;
    height: 12px;
    background: var(--primary);
    border-radius: 50%;
    border: 3px solid var(--bg-white);
    box-shadow: 0 0 0 2px var(--primary);
}

.timeline-item .year {
    font-size: 14px;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.timeline-item h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 6px;
}

.timeline-item p {
    font-size: 15px;
    color: var(--gray-500);
    line-height: 1.7;
}

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

.faq-item {
    background: var(--bg-white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    margin-bottom: 12px;
    overflow: hidden;
    transition: var(--transition-fast);
}

.faq-item.active {
    border-color: var(--primary-light);
    box-shadow: var(--shadow-sm);
}

.faq-question {
    width: 100%;
    padding: 20px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-align: left;
    font-size: 16px;
    font-weight: 600;
    color: var(--dark);
    background: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

.faq-question:hover {
    color: var(--primary);
}

.faq-question .icon {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    transition: var(--transition);
}

.faq-item.active .faq-question .icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding: 0 24px;
}

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

.faq-answer p {
    font-size: 15px;
    line-height: 1.8;
    color: var(--gray-500);
}

/* ============================================
   页脚
   ============================================ */
.site-footer {
    background: var(--dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 64px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo {
    color: #FFFFFF;
    margin-bottom: 16px;
}

.footer-brand .logo .logo-text {
    color: #FFFFFF;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.7;
    margin-bottom: 20px;
    color: rgba(255, 255, 255, 0.6);
}

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

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-sm);
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-fast);
}

.footer-social a:hover {
    background: var(--primary);
    color: #FFFFFF;
}

.footer-social svg {
    width: 18px;
    height: 18px;
}

.footer-col h4 {
    font-size: 16px;
    font-weight: 700;
    color: #FFFFFF;
    margin-bottom: 20px;
}

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

.footer-col a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
    transition: var(--transition-fast);
}

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

.footer-bottom {
    padding: 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
    flex-wrap: wrap;
    gap: 12px;
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.5);
}

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

/* ============================================
   下载弹窗
   ============================================ */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: #FFFFFF;
    border-radius: var(--radius-lg);
    max-width: 520px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    transform: scale(0.9) translateY(20px);
    transition: var(--transition);
    position: relative;
}

.modal-overlay.active .modal {
    transform: scale(1) translateY(0);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--gray-100);
    color: var(--gray-500);
    transition: var(--transition-fast);
    z-index: 1;
}

.modal-close:hover {
    background: var(--gray-200);
    color: var(--dark);
}

.modal-header {
    padding: 40px 40px 24px;
    text-align: center;
    border-bottom: 1px solid var(--gray-200);
}

.modal-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #FFFFFF;
}

.modal-icon svg {
    width: 32px;
    height: 32px;
}

.modal-header h3 {
    font-size: 24px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 8px;
}

.modal-header p {
    font-size: 15px;
    color: var(--gray-500);
}

.modal-body {
    padding: 32px 40px 40px;
}

.qr-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

.qr-item {
    text-align: center;
}

.qr-image {
    width: 160px;
    height: 160px;
    margin: 0 auto 12px;
    padding: 12px;
    background: #FFFFFF;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.qr-item:hover .qr-image {
    border-color: var(--primary);
    box-shadow: var(--shadow-md);
}

.qr-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.qr-item h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 4px;
}

.qr-item p {
    font-size: 13px;
    color: var(--gray-500);
}

.modal-tip {
    background: var(--primary-bg);
    border-radius: var(--radius-sm);
    padding: 14px 18px;
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 13px;
    color: var(--gray-600);
    line-height: 1.6;
}

.modal-tip svg {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    color: var(--primary);
    margin-top: 2px;
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 42px;
    }
    
    .section-title {
        font-size: 34px;
    }
    
    .features-grid,
    .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    :root {
        --header-height: 64px;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .main-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        align-items: stretch;
        padding: 16px;
        gap: 0;
        box-shadow: var(--shadow-lg);
        max-height: 0;
        overflow: hidden;
        transition: var(--transition);
    }
    
    .main-nav.active {
        max-height: 400px;
        padding: 16px;
    }
    
    .nav-list {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }
    
    .nav-list a {
        padding: 14px 16px;
        border-radius: var(--radius-sm);
    }
    
    .nav-cta {
        margin: 12px 0 0;
    }
    
    .nav-cta .btn {
        width: 100%;
    }
    
    .hero {
        padding: 110px 0 60px;
    }
    
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-title {
        font-size: 34px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .hero-stats {
        gap: 24px;
    }
    
    .hero-stat-num {
        font-size: 26px;
    }
    
    .section {
        padding: 64px 0;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .section-header {
        margin-bottom: 40px;
    }
    
    .features-grid,
    .testimonials-grid,
    .scenarios-grid {
        grid-template-columns: 1fr;
    }
    
    .scenario-card {
        flex-direction: column;
        gap: 16px;
    }
    
    .feature-detail,
    .feature-detail.reverse {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .feature-detail.reverse .feature-detail-content {
        order: 0;
    }
    
    .download-options {
        grid-template-columns: 1fr;
    }
    
    .guide-grid {
        grid-template-columns: 1fr;
    }
    
    .guide-sidebar {
        position: static;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .page-banner h1 {
        font-size: 32px;
    }
    
    .cta-section h2 {
        font-size: 30px;
    }
    
    .modal {
        max-width: 100%;
    }
    
    .qr-row {
        grid-template-columns: 1fr 1fr;
        gap: 16px;
    }
    
    .qr-image {
        width: 130px;
        height: 130px;
    }
    
    .modal-header,
    .modal-body {
        padding-left: 24px;
        padding-right: 24px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .hero-actions .btn {
        width: 100%;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 20px;
    }
    
    .feature-card,
    .scenario-card,
    .testimonial-card {
        padding: 24px;
    }
    
    .btn-lg {
        padding: 14px 28px;
        font-size: 16px;
    }
}

/* 打印优化 */
@media print {
    .site-header,
    .site-footer,
    .modal-overlay,
    .menu-toggle {
        display: none;
    }
    
    body {
        color: #000;
    }
}

/* 无障碍 - 焦点样式 */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

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

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