/* 基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: #333;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .container {
    display: flex;
    flex-direction: column;
    padding: 15px 20px;
}

header h1 {
    font-size: 1.5rem;
    color: #667eea;
    margin-bottom: 5px;
}

header .subtitle {
    font-size: 0.85rem;
    color: #666;
    margin-bottom: 10px;
}

nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

nav a {
    text-decoration: none;
    color: #555;
    padding: 8px 12px;
    border-radius: 20px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

nav a:hover,
nav a.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

/* 主内容区 */
main {
    padding: 30px 0;
    min-height: calc(100vh - 200px);
}

/* Hero区域 */
.hero {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.hero h2 {
    font-size: 2rem;
    margin-bottom: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    color: #666;
    font-size: 1.1rem;
    margin-bottom: 25px;
    line-height: 1.8;
}

/* 按钮 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 1rem;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.btn-secondary {
    background: white;
    color: #667eea;
    border: 2px solid #667eea;
}

.btn-secondary:hover {
    background: #667eea;
    color: white;
}

/* 功能卡片区域 */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
}

.feature {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.feature:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.15);
}

.feature i {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.feature h3 {
    font-size: 1.3rem;
    margin-bottom: 10px;
    color: #333;
}

.feature p {
    color: #666;
    font-size: 0.95rem;
}

/* 订阅卡片 */
.subscription-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    overflow: hidden;
    margin-bottom: 25px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.subscription-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.15);
}

.card-header {
    display: flex;
    align-items: center;
    padding: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.card-header .icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    margin-right: 15px;
    object-fit: cover;
    background: white;
}

.card-header h3 {
    font-size: 1.2rem;
}

.card-body {
    padding: 20px;
}

.description {
    color: #666;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.actions .btn {
    flex: 1;
    min-width: 120px;
    text-align: center;
    padding: 12px 20px;
}

/* 订阅列表 */
.subscription-list-full {
    display: grid;
    gap: 20px;
}

/* 下载选项 */
.download-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

.option {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
}

.option:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.15);
}

.option i {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.option h3 {
    font-size: 1.3rem;
    margin-bottom: 15px;
}

.option p {
    color: #666;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

/* 安装指南 */
.installation {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.installation h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #333;
}

.installation ol {
    padding-left: 25px;
}

.installation li {
    color: #666;
    margin-bottom: 12px;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* 视频教程 */
.video-tutorials {
    margin-top: 30px;
}

.video-tutorials h2 {
    font-size: 1.5rem;
    margin-bottom: 25px;
    text-align: center;
    color: #333;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 25px;
}

.video-item {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.video-wrapper {
    position: relative;
    width: 100%;
    padding-top: 56.25%;
    background: #000;
}

.video-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.video-item h3 {
    padding: 15px 20px 10px;
    font-size: 1rem;
    color: #333;
}

.video-item p {
    padding: 0 20px 20px;
    color: #666;
    font-size: 0.9rem;
}

/* FAQ */
.faq {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.faq h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #333;
}

.faq-item {
    margin-bottom: 20px;
}

.faq-question {
    font-weight: 600;
    color: #333;
    margin-bottom: 10px;
}

.faq-answer {
    color: #666;
    line-height: 1.6;
}

/* 联系方式 */
.contact {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.contact h2 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: #333;
}

.contact p {
    color: #666;
    margin-bottom: 15px;
}

.contact ul {
    list-style: none;
    padding: 0;
}

.contact li {
    color: #666;
    margin-bottom: 10px;
    padding: 12px 15px;
    background: #f8f9fa;
    border-radius: 8px;
    word-break: break-all;
}

.contact a {
    color: #667eea;
    text-decoration: none;
    word-break: break-all;
}

.contact a:hover {
    text-decoration: underline;
}

/* 免责声明 */
.disclaimer-content {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.disclaimer-intro {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 30px;
}

.disclaimer-section {
    margin-bottom: 30px;
    padding-bottom: 25px;
    border-bottom: 1px solid #eee;
}

.disclaimer-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
}

.disclaimer-section h3 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: #333;
}

.disclaimer-section p {
    color: #666;
    margin-bottom: 15px;
    line-height: 1.8;
    font-size: 0.95rem;
}

.disclaimer-section ul {
    padding-left: 25px;
    margin-bottom: 15px;
}

.disclaimer-section li {
    color: #666;
    margin-bottom: 8px;
    line-height: 1.6;
}

.disclaimer-footer {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid #667eea;
    text-align: center;
}

.disclaimer-footer p {
    color: #666;
    margin-bottom: 10px;
}

/* 页脚 */
footer {
    background: rgba(0, 0, 0, 0.3);
    color: white;
    padding: 30px 0;
    text-align: center;
    margin-top: auto;
}

footer p {
    margin-bottom: 10px;
    font-size: 0.9rem;
}

footer a {
    color: #fff;
    text-decoration: underline;
}

footer a:hover {
    color: #ddd;
}

/* ===== 移动端响应式设计 ===== */

/* 平板设备 */
@media (max-width: 992px) {
    .container {
        padding: 0 15px;
    }

    .hero {
        padding: 30px 20px;
    }

    .hero h2 {
        font-size: 1.6rem;
    }

    .features,
    .download-options,
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

/* 手机设备 - 768px以下 */
@media (max-width: 768px) {
    body {
        font-size: 14px;
    }

    header .container {
        padding: 12px 15px;
    }

    header h1 {
        font-size: 1.15rem;
        text-align: center;
    }

    header .subtitle {
        font-size: 0.75rem;
        text-align: center;
        margin-bottom: 12px;
    }

    nav {
        display: flex;
        flex-wrap: wrap;
        justify-content: center;
        gap: 6px;
    }

    nav a {
        padding: 8px 10px;
        font-size: 0.75rem;
        border-radius: 15px;
    }

    main {
        padding: 15px 0;
    }

    .hero {
        padding: 20px 15px;
        border-radius: 15px;
        margin-bottom: 20px;
    }

    .hero h2 {
        font-size: 1.2rem;
    }

    .hero p {
        font-size: 0.9rem;
        line-height: 1.6;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }

    .features,
    .download-options,
    .video-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .feature,
    .option,
    .video-item {
        padding: 20px 15px;
        border-radius: 15px;
    }

    .feature i,
    .option i {
        font-size: 2rem;
        margin-bottom: 15px;
    }

    .feature h3,
    .option h3 {
        font-size: 1.1rem;
    }

    .feature p,
    .option p {
        font-size: 0.85rem;
    }

    .subscription-card {
        margin-bottom: 15px;
        border-radius: 15px;
    }

    .card-header {
        padding: 12px 15px;
    }

    .card-header .icon {
        width: 36px;
        height: 36px;
        margin-right: 10px;
    }

    .card-header h3 {
        font-size: 0.95rem;
    }

    .card-body {
        padding: 15px;
    }

    .description {
        font-size: 0.85rem;
        margin-bottom: 15px;
    }

    .actions {
        flex-direction: column;
        gap: 10px;
    }

    .actions .btn {
        width: 100%;
        min-width: unset;
    }

    .installation,
    .faq,
    .contact,
    .disclaimer-content {
        padding: 20px 15px;
        border-radius: 15px;
    }

    .installation h2,
    .faq h2,
    .contact h2 {
        font-size: 1.15rem;
    }

    .installation li {
        font-size: 0.85rem;
        margin-bottom: 10px;
    }

    .contact li {
        font-size: 0.85rem;
        padding: 10px 12px;
    }

    .disclaimer-intro {
        font-size: 0.95rem;
    }

    .disclaimer-section {
        margin-bottom: 20px;
        padding-bottom: 20px;
    }

    .disclaimer-section h3 {
        font-size: 1rem;
    }

    .disclaimer-section p {
        font-size: 0.85rem;
    }

    .disclaimer-footer {
        margin-top: 20px;
        padding-top: 15px;
    }

    .video-tutorials {
        margin-top: 20px;
    }

    .video-tutorials h2 {
        font-size: 1.15rem;
        margin-bottom: 20px;
    }

    .video-item h3 {
        padding: 12px 15px 8px;
        font-size: 0.9rem;
    }

    .video-item p {
        padding: 0 15px 15px;
        font-size: 0.8rem;
    }

    footer {
        padding: 20px 0;
    }

    footer p {
        font-size: 0.75rem;
    }
}

/* 超小屏幕 - 480px以下 */
@media (max-width: 480px) {
    .container {
        padding: 0 12px;
    }

    header .container {
        padding: 10px 12px;
    }

    header h1 {
        font-size: 1rem;
    }

    header .subtitle {
        font-size: 0.7rem;
    }

    nav a {
        padding: 6px 8px;
        font-size: 0.7rem;
    }

    .hero {
        padding: 15px 12px;
    }

    .hero h2 {
        font-size: 1.05rem;
    }

    .hero p {
        font-size: 0.8rem;
    }

    .btn {
        padding: 10px 18px;
        font-size: 0.85rem;
    }

    .feature,
    .option {
        padding: 15px 12px;
    }

    .feature i,
    .option i {
        font-size: 1.8rem;
    }

    .card-header {
        padding: 10px 12px;
    }

    .card-header .icon {
        width: 30px;
        height: 30px;
        margin-right: 8px;
    }

    .card-header h3 {
        font-size: 0.85rem;
    }

    .card-body {
        padding: 12px;
    }

    .installation,
    .faq,
    .contact,
    .disclaimer-content {
        padding: 15px 12px;
    }

    .video-item {
        border-radius: 12px;
    }
}

/* 针对触摸设备的优化 */
@media (hover: none) and (pointer: coarse) {
    nav a:hover {
        background: transparent;
        color: #555;
    }

    nav a:active {
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        color: white;
    }

    .btn:active {
        transform: scale(0.98);
    }

    .feature:active,
    .option:active,
    .subscription-card:active {
        transform: scale(0.99);
    }
}

/* 安全区域适配 - iPhone X以上 */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    body {
        padding-bottom: env(safe-area-inset-bottom);
    }

    footer {
        padding-bottom: calc(20px + env(safe-area-inset-bottom));
    }
}

/* 横向手机优化 */
@media (max-height: 500px) and (orientation: landscape) {
    .hero {
        padding: 15px;
    }

    .hero h2 {
        font-size: 1rem;
        margin-bottom: 8px;
    }

    .hero p {
        font-size: 0.8rem;
        margin-bottom: 15px;
    }

    .features {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
    }

    .feature {
        padding: 12px;
    }

    .feature i {
        font-size: 1.5rem;
        margin-bottom: 8px;
    }

    .feature h3 {
        font-size: 0.85rem;
        margin-bottom: 5px;
    }

    .feature p {
        font-size: 0.7rem;
    }
}