/* ============================================
 * YinDesign 音嘚赞官网样式
 * 配色方案：中国传统色
 * ============================================ */

/* CSS 变量 - 传统配色 */
:root {
    /* 主色调 - 朱砂红系 */
    --primary: #C03F3C;           /* 朱砂红 */
    --primary-light: #E85A4F;     /* 浅朱红 */
    --primary-dark: #8B2323;      /* 深朱红 */
    
    /* 辅助色 - 黛蓝系 */
    --secondary: #2E4A62;         /* 黛蓝 */
    --secondary-light: #4A6B8A;   /* 浅黛蓝 */
    --secondary-dark: #1A2F42;    /* 深黛蓝 */
    
    /* 点缀色 */
    --accent: #D4A84B;            /* 金色 */
    --accent-light: #E8C97A;      /* 浅金 */
    
    /* 中性色 */
    --text-primary: #2C2C2C;      /* 墨黑 */
    --text-secondary: #5A5A5A;    /* 灰黑 */
    --text-muted: #8A8A8A;        /* 浅灰 */
    --bg-light: #FAF8F5;          /* 米白 */
    --bg-white: #FFFFFF;          /* 纯白 */
    --border: #E5E0D8;            /* 边框色 */
    
    /* 渐变 */
    --gradient-hero: linear-gradient(135deg, #FAF8F5 0%, #F5F0E8 50%, #EDE5D8 100%);
    --gradient-primary: linear-gradient(135deg, #C03F3C 0%, #E85A4F 100%);
    --gradient-secondary: linear-gradient(135deg, #2E4A62 0%, #4A6B8A 100%);
    
    /* 字体（系统自带，无需网络） */
    --font-serif: 'Songti SC', 'SimSun', 'STSong', 'Georgia', serif;
    --font-sans: 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.15);
}

/* ============================================
 * 基础样式
 * ============================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-white);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

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

/* ============================================
 * 导航栏
 * ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    color: white;
    font-family: var(--font-serif);
    font-size: 18px;
    font-weight: 600;
    border-radius: var(--radius-md);
}

.brand-logo {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
    object-fit: contain;
}

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

.brand-yd {
    font-family: var(--font-sans);
}

.brand-name {
    font-family: var(--font-serif);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    list-style: none;
}

.nav-menu a {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

.nav-menu a:hover {
    color: var(--primary);
    background: rgba(192, 63, 60, 0.08);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

/* ============================================
 * Hero 区域
 * ============================================ */

.hero {
    padding: 120px 0 80px;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

/* Hero 背景轮播（底层大图） */
.hero-bg-carousel {
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    z-index: 0;
}

.hero-bg-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1.2s ease;
    background-size: cover;
    background-position: center;
    filter: blur(2px) saturate(1.2);
    transform: scale(1.05);
}

.hero-bg-slide.active {
    opacity: 0.55;
}

/* 毛玻璃叠加层 */
.hero-glass {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 1;
    backdrop-filter: blur(20px) saturate(1.2);
    -webkit-backdrop-filter: blur(20px) saturate(1.2);
    background: rgba(250, 248, 245, 0.15);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23C03F3C' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
    z-index: 2;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
    position: relative;
    z-index: 3;
}

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

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(192, 63, 60, 0.1);
    color: var(--primary);
    font-size: 14px;
    font-weight: 500;
    border-radius: 20px;
    margin-bottom: var(--spacing-md);
}

.hero-badge-inverted {
    background: var(--primary);
    color: white;
}

.hero-title {
    margin-bottom: var(--spacing-md);
}

.title-main {
    display: block;
    font-size: 48px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    margin-bottom: var(--spacing-xs);
}

.title-yd {
    font-family: var(--font-sans);
}

.title-name {
    font-family: var(--font-serif);
}

.title-sub {
    display: block;
    font-size: 20px;
    font-weight: 400;
    color: var(--text-secondary);
}

.hero-desc {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-logos {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.6);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    justify-content: center;
}

.logo-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.logo-img {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    object-fit: contain;
}

.logo-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-soft);
    color: var(--text-primary);
}

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

.mac-icon {
    background: linear-gradient(135deg, #f5f5f7 0%, #e8e8ed 100%);
    color: #1d1d1f;
}

.logo-label {
    font-size: 12px;
    color: var(--text-muted);
}

.logo-plus {
    font-size: 24px;
    font-weight: 300;
    color: var(--text-muted);
}

.hero-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

.hero-image {
    display: flex;
    justify-content: center;
}

.screenshot-placeholder {
    width: 100%;
    max-width: 600px;
    aspect-ratio: 16/10;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    overflow: hidden;
}

.screenshot-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

/* ============================================
 * 轮播图
 * ============================================ */

.carousel {
    position: relative;
    width: 100%;
    max-width: 680px;
    aspect-ratio: 4/3;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    cursor: pointer;
}

.carousel-track {
    position: relative;
    width: 100%;
    height: 100%;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.6s ease;
}

.carousel-slide.active {
    opacity: 1;
}

.carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.carousel-dots {
    position: absolute;
    bottom: 12px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 8px;
    z-index: 2;
}

.carousel-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.3s ease;
}

.carousel-dot.active {
    background: white;
    transform: scale(1.2);
}

.carousel-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.3);
    color: white;
    border: none;
    font-size: 20px;
    cursor: pointer;
    opacity: 0;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

.carousel:hover .carousel-arrow {
    opacity: 1;
}

.carousel-arrow:hover {
    background: rgba(0, 0, 0, 0.6);
}

.carousel-prev {
    left: 8px;
}

.carousel-next {
    right: 8px;
}

/* ============================================
 * 图片灯箱（放大查看）
 * ============================================ */

.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    cursor: zoom-out;
}

.lightbox.active {
    opacity: 1;
    visibility: visible;
}

.lightbox img {
    max-width: 90vw;
    max-height: 90vh;
    border-radius: var(--radius-lg);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.lightbox.active img {
    transform: scale(1);
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: none;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

.lightbox-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    color: white;
    border: none;
    font-size: 32px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease;
    z-index: 2001;
}
.lightbox-arrow:hover {
    background: rgba(255, 255, 255, 0.3);
}
.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

.lightbox-caption {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    text-align: center;
    max-width: 80vw;
}

.placeholder-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-muted);
}

.placeholder-icon {
    font-size: 48px;
}

.placeholder-text {
    font-size: 16px;
}

.placeholder-hint {
    font-size: 12px;
    color: var(--text-muted);
}

/* ============================================
 * 按钮样式
 * ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 16px rgba(192, 63, 60, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(192, 63, 60, 0.4);
}

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

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

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

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

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

/* ============================================
 * 通用区块样式
 * ============================================ */

section {
    padding: var(--spacing-xxl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.section-title {
    font-family: var(--font-serif);
    font-size: 36px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.section-desc {
    font-size: 16px;
    color: var(--text-secondary);
}

/* ============================================
 * 功能特性
 * ============================================ */

.features {
    background: var(--bg-white);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
}

.feature-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid var(--border);
    transition: all 0.3s ease;
}

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

.feature-icon {
    font-size: 40px;
    margin-bottom: var(--spacing-sm);
}

.feature-title {
    font-family: var(--font-serif);
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.feature-desc {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.feature-image {
    width: 100%;
    border-radius: var(--radius-md);
    overflow: hidden;
    cursor: pointer;
    position: relative;
    border: 1px solid var(--border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.feature-image:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}
.feature-image img {
    width: 100%;
    height: auto;
    display: block;
}
.feature-image-zoom {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 8px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.6));
    color: #fff;
    font-size: 12px;
    text-align: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.feature-image:hover .feature-image-zoom {
    opacity: 1;
}

/* ============================================
 * 适用场景
 * ============================================ */

.scenarios {
    background: var(--gradient-hero);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: var(--spacing-md);
}

.scenario-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.scenario-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.scenario-icon {
    font-size: 32px;
}

.scenario-text {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    text-align: center;
}

/* ============================================
 * 订阅方案
 * ============================================ */

.pricing {
    background: var(--bg-white);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    align-items: start;
}

.pricing-col {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.pricing-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    border: 1px solid var(--border);
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    width: 100%;
}

.pricing-card:hover {
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border-color: var(--primary);
    box-shadow: var(--shadow-lg);
    transform: scale(1.05);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient-primary);
    color: white;
    padding: 4px 20px;
    font-size: 12px;
    font-weight: 600;
    border-radius: 20px;
}

.pricing-header {
    margin-bottom: var(--spacing-md);
}

.pricing-name {
    font-family: var(--font-serif);
    font-size: 24px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.pricing-desc {
    font-size: 14px;
    color: var(--text-muted);
}

.pricing-price {
    margin-bottom: var(--spacing-lg);
}

.price-amount {
    font-family: var(--font-serif);
    font-size: 48px;
    font-weight: 700;
    color: var(--primary);
}

.price-period {
    font-size: 16px;
    color: var(--text-muted);
}

.pricing-features {
    list-style: none;
    text-align: left;
    margin-bottom: var(--spacing-lg);
    flex: 1;
}

.pricing-features li {
    padding: var(--spacing-xs) 0;
    font-size: 14px;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-card-note {
    margin-top: var(--spacing-sm);
    font-size: 12px;
    color: var(--accent);
    text-align: center;
}

.pricing-footer-note {
    text-align: center;
    margin-top: var(--spacing-lg);
    font-size: 14px;
    color: var(--text-muted);
}

/* ============================================
 * 使用教程
 * ============================================ */

.tutorial {
    background: var(--gradient-hero);
}

.tutorial-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.tutorial-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    position: relative;
    transition: all 0.3s ease;
}

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

.tutorial-number {
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    font-family: var(--font-serif);
    font-size: 14px;
    font-weight: 700;
    color: var(--primary);
    opacity: 0.5;
}

.tutorial-image-placeholder {
    width: 100%;
    height: 100px;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 12px;
    margin-bottom: var(--spacing-sm);
    border: 1px dashed var(--border);
}

.tutorial-title {
    font-family: var(--font-serif);
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.tutorial-desc {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.tutorial-link {
    font-size: 13px;
    color: var(--primary);
    font-weight: 500;
}

.tutorial-link:hover {
    text-decoration: underline;
}

/* ============================================
 * 下载区域
 * ============================================ */

.download {
    background: var(--secondary);
    color: white;
}

.download-content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.download-title {
    font-family: var(--font-serif);
    font-size: 36px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.download-desc {
    font-size: 16px;
    opacity: 0.8;
    margin-bottom: var(--spacing-lg);
}

.download-info {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.info-label {
    font-size: 12px;
    opacity: 0.6;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.info-value {
    font-size: 18px;
    font-weight: 600;
}

.download-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
}

.download .btn-primary {
    background: white;
    color: var(--secondary);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.download .btn-primary:hover {
    background: var(--bg-light);
}

.download .btn-secondary {
    background: transparent;
    color: white;
    border-color: rgba(255, 255, 255, 0.3);
}

.download .btn-secondary:hover {
    border-color: white;
}

/* ============================================
 * 页脚
 * ============================================ */

.footer {
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: var(--spacing-md);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.footer-brand .brand-icon {
    background: var(--primary);
}

.footer-brand .brand-text {
    color: white;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-links a {
    font-size: 14px;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

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

.footer-contact {
    text-align: right;
}

.footer-contact p {
    font-size: 14px;
    opacity: 0.7;
    margin-bottom: var(--spacing-xs);
}

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    opacity: 0.5;
}

/* ============================================
 * 响应式设计
 * ============================================ */

@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-logos {
        justify-content: center;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-image {
        order: -1;
    }
    
    .screenshot-placeholder {
        max-width: 400px;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .scenarios-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .tutorial-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: var(--spacing-md);
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .title-main {
        font-size: 36px;
    }
    
    .title-sub {
        font-size: 18px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tutorial-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .footer-contact {
        text-align: center;
    }
    
    .download-info {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .download-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 100px 0 60px;
    }
    
    .title-main {
        font-size: 28px;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .scenarios-grid {
        grid-template-columns: 1fr;
    }
}

/* ============================================
 * Lightbox 点击放大
 * ============================================ */
.feature-lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 9999;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    animation: lightboxFadeIn 0.3s ease;
}
.feature-lightbox.active {
    display: flex;
}
.feature-lightbox img {
    max-width: 90vw;
    max-height: 90vh;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: lightboxZoomIn 0.3s ease;
}
.feature-lightbox-close {
    position: absolute;
    top: 20px;
    right: 30px;
    color: #fff;
    font-size: 36px;
    cursor: pointer;
    z-index: 10000;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transition: background 0.2s ease;
}
.feature-lightbox-close:hover {
    background: rgba(255, 255, 255, 0.25);
}
.feature-lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: #fff;
    font-size: 32px;
    cursor: pointer;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    transition: background 0.2s ease;
    user-select: none;
}
.feature-lightbox-nav:hover {
    background: rgba(255, 255, 255, 0.25);
}
.feature-lightbox-prev { left: 20px; }
.feature-lightbox-next { right: 20px; }
.feature-lightbox-counter {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
}

@keyframes lightboxFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
@keyframes lightboxZoomIn {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}