/* ========================================
   3d同人动漫 - 专业自媒体视频创作平台
   主样式文件 - 移动端优先响应式设计
   ======================================== */

/* CSS变量定义 */
:root {
    --primary-color: #6c5ce7;
    --primary-dark: #5b4cdb;
    --secondary-color: #a29bfe;
    --accent-color: #fd79a8;
    --dark-bg: #1a0a2e;
    --darker-bg: #0d0518;
    --card-bg: #2d1b4e;
    --text-primary: #ffffff;
    --text-secondary: #b8b8d1;
    --text-muted: #8888a0;
    --border-color: #3d2a5e;
    --gradient-primary: linear-gradient(135deg, #6c5ce7 0%, #a29bfe 100%);
    --gradient-accent: linear-gradient(135deg, #fd79a8 0%, #f8a5c2 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 20px;
    --max-width: 1400px;
    --header-height: 80px;
}

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

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", sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

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

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

a:hover, a:focus {
    color: var(--accent-color);
}

ul, ol {
    list-style: none;
}

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

address {
    font-style: normal;
}

/* ========================================
   头部导航样式
   ======================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(26, 10, 46, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    height: var(--header-height);
}

.main-nav {
    height: 100%;
}

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

.logo-link {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.site-logo {
    height: 50px;
    width: auto;
}

.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 20px;
    padding: 0;
    z-index: 1001;
}

.menu-bar {
    display: block;
    width: 100%;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-normal);
}

.nav-menu {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--dark-bg);
    padding: 30px 20px;
    flex-direction: column;
    gap: 10px;
    overflow-y: auto;
}

.nav-menu.active {
    display: flex;
}

.nav-item a {
    display: block;
    padding: 15px 20px;
    color: var(--text-primary);
    font-size: 1.1rem;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
}

.nav-item a:hover,
.nav-item.active a {
    background: var(--card-bg);
    color: var(--accent-color);
}

.nav-item.highlight a {
    background: var(--gradient-accent);
    color: var(--text-primary);
    font-weight: 600;
}

.nav-item.highlight a:hover {
    opacity: 0.9;
}

/* ========================================
   面包屑导航
   ======================================== */
.breadcrumb-nav {
    margin-top: var(--header-height);
    padding: 15px 20px;
    background: var(--darker-bg);
    border-bottom: 1px solid var(--border-color);
}

.breadcrumb-list {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
    font-size: 0.9rem;
}

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

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

.separator {
    color: var(--text-muted);
}

/* ========================================
   主内容区域
   ======================================== */
.main-content {
    padding-top: 20px;
}

.section-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.section-header {
    text-align: center;
    margin-bottom: 40px;
}

.section-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 10px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.section-subtitle {
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ========================================
   英雄区域
   ======================================== */
.hero-section {
    padding: 60px 0;
    background: linear-gradient(180deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.hero-text {
    text-align: center;
}

.hero-title {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: 20px;
}

.hero-title .highlight {
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 30px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 15px 30px;
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition-normal);
}

.cta-button.primary {
    background: var(--gradient-primary);
    color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

.cta-button.secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--primary-color);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.hero-image {
    text-align: center;
}

.hero-image img {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    margin: 0 auto;
}

/* ========================================
   页面英雄区（栏目页）
   ======================================== */
.page-hero {
    padding: 60px 0;
    background: linear-gradient(180deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
    text-align: center;
}

.page-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 15px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ========================================
   服务卡片
   ======================================== */
.services-section {
    padding: 60px 0;
}

.services-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
}

.service-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: 30px 25px;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.service-icon {
    font-size: 3rem;
    margin-bottom: 20px;
    display: block;
}

.service-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.service-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========================================
   视频展示
   ======================================== */
.video-showcase {
    padding: 60px 0;
    background: var(--darker-bg);
}

.video-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
}

.video-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.video-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.video-thumbnail {
    position: relative;
    aspect-ratio: 16/9;
    overflow: hidden;
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-normal);
}

.video-card:hover .video-thumbnail img {
    transform: scale(1.05);
}

.play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 60px;
    height: 60px;
    background: rgba(108, 92, 231, 0.9);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--text-primary);
    transition: var(--transition-normal);
}

.video-card:hover .play-overlay {
    background: var(--accent-color);
    transform: translate(-50%, -50%) scale(1.1);
}

.video-duration {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.8);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.video-views {
    position: absolute;
    bottom: 10px;
    left: 10px;
    background: rgba(108, 92, 231, 0.9);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--text-primary);
}

.video-info {
    padding: 20px;
}

.video-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.video-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 10px;
}

.video-rating {
    color: #ffd700;
    font-size: 0.9rem;
}

/* ========================================
   视频播放器
   ======================================== */
.video-player-section {
    padding: 60px 0;
}

.video-player-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.video-container {
    position: relative;
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.main-video-player {
    width: 100%;
    aspect-ratio: 16/9;
    background: #000;
}

.video-caption {
    padding: 15px 20px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

/* ========================================
   介绍内容
   ======================================== */
.category-intro {
    padding: 60px 0;
}

.intro-content {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.intro-image img {
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
}

.intro-text p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.intro-text p:last-child {
    margin-bottom: 0;
}

/* ========================================
   特色功能
   ======================================== */
.service-features,
.features-grid,
.elements-grid,
.themes-grid,
.types-grid {
    padding: 60px 0;
}

.features-grid,
.elements-grid,
.themes-grid,
.types-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
    padding: 0;
}

.feature-card,
.element-card,
.theme-card,
.type-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: 30px 25px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.feature-card:hover,
.element-card:hover,
.theme-card:hover,
.type-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon,
.element-icon,
.theme-icon,
.type-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
    display: block;
}

.feature-title,
.element-title,
.theme-title,
.type-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.feature-desc,
.element-desc,
.theme-desc,
.type-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========================================
   流程步骤
   ======================================== */
.creation-process {
    padding: 60px 0;
    background: var(--darker-bg);
}

.process-steps {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
}

.process-step {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: 30px 25px;
    text-align: center;
    border: 1px solid var(--border-color);
    position: relative;
}

.step-number {
    display: inline-block;
    width: 50px;
    height: 50px;
    line-height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.step-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.step-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ========================================
   统计数据
   ======================================== */
.platform-stats {
    padding: 60px 0;
    background: var(--darker-bg);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: 30px 20px;
    text-align: center;
    border: 1px solid var(--border-color);
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ========================================
   适用场景
   ======================================== */
.application-scenes {
    padding: 60px 0;
}

.scenes-list {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: 30px;
    border: 1px solid var(--border-color);
}

.scenes-list li {
    padding: 12px 0;
    padding-left: 30px;
    position: relative;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.scenes-list li:last-child {
    border-bottom: none;
}

.scenes-list li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* ========================================
   CTA区域
   ======================================== */
.cta-section {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
}

.cta-content {
    text-align: center;
}

.cta-title {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.cta-desc {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
    margin-bottom: 30px;
}

.watch-btn {
    display: inline-block;
    padding: 15px 40px;
    background: var(--text-primary);
    color: var(--primary-color);
    border-radius: var(--border-radius-md);
    font-weight: 600;
    transition: var(--transition-normal);
}

.watch-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    color: var(--primary-dark);
}

/* ========================================
   APP下载页面
   ======================================== */
.app-download-page .app-hero {
    padding: 60px 0;
    background: linear-gradient(180deg, var(--darker-bg) 0%, var(--dark-bg) 100%);
}

.app-hero-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.app-title {
    font-size: 2rem;
    font-weight: 800;
    margin-bottom: 15px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-subtitle {
    color: var(--accent-color);
    font-size: 1.2rem;
    margin-bottom: 20px;
}

.app-description {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.app-rating {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 15px;
    margin-bottom: 30px;
}

.rating-stars {
    color: #ffd700;
    font-size: 1.2rem;
}

.rating-score {
    font-weight: 600;
    color: var(--text-primary);
}

.rating-count {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 20px;
}

.download-buttons.centered {
    align-items: center;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 15px;
    padding: 15px 25px;
    border-radius: var(--border-radius-md);
    transition: var(--transition-normal);
    color: var(--text-primary);
}

.android-btn {
    background: linear-gradient(135deg, #3ddc84 0%, #2ecc71 100%);
}

.ios-btn {
    background: linear-gradient(135deg, #555 0%, #333 100%);
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    color: var(--text-primary);
}

.btn-icon {
    font-size: 2rem;
}

.btn-text {
    display: flex;
    flex-direction: column;
}

.btn-text small {
    font-size: 0.8rem;
    opacity: 0.9;
}

.btn-text strong {
    font-size: 1.1rem;
}

.app-version {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.app-preview img {
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    margin: 0 auto;
}

/* 应用截图 */
.app-screenshots {
    padding: 60px 0;
    background: var(--darker-bg);
}

.screenshots-gallery {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

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

.screenshot-item img {
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-md);
    margin: 0 auto 15px;
    max-height: 300px;
    object-fit: cover;
}

.screenshot-item figcaption {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* 系统要求 */
.app-requirements {
    padding: 60px 0;
}

.requirements-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 25px;
}

.requirement-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: 30px;
    border: 1px solid var(--border-color);
}

.requirement-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.requirement-list li {
    padding: 10px 0;
    color: var(--text-secondary);
    border-bottom: 1px solid var(--border-color);
}

.requirement-list li:last-child {
    border-bottom: none;
}

/* 更新日志 */
.app-updates {
    padding: 60px 0;
    background: var(--darker-bg);
}

.updates-list {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.update-item {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: 25px;
    border: 1px solid var(--border-color);
}

.update-version {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 5px;
}

.update-date {
    color: var(--text-muted);
    font-size: 0.85rem;
    display: block;
    margin-bottom: 15px;
}

.update-changes {
    padding-left: 20px;
}

.update-changes li {
    color: var(--text-secondary);
    padding: 5px 0;
    position: relative;
}

.update-changes li::before {
    content: "•";
    position: absolute;
    left: -15px;
    color: var(--primary-color);
}

/* FAQ */
.app-faq {
    padding: 60px 0;
}

.faq-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.faq-item {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.faq-question {
    padding: 20px 25px;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question::after {
    content: "+";
    font-size: 1.5rem;
    color: var(--primary-color);
}

.faq-item[open] .faq-question::after {
    content: "−";
}

.faq-answer {
    padding: 0 25px 20px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 下载CTA */
.download-cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
}

/* ========================================
   团队展示
   ======================================== */
.team-section {
    padding: 60px 0;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
}

.team-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: 25px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: var(--transition-normal);
}

.team-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.team-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    margin: 0 auto 20px;
    overflow: hidden;
    border: 3px solid var(--primary-color);
}

.team-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.team-name {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.team-role {
    color: var(--accent-color);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.team-bio {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* ========================================
   联系表单
   ======================================== */
.contact-section {
    padding: 60px 0;
    background: var(--darker-bg);
}

.contact-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.contact-info-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: 30px;
    border: 1px solid var(--border-color);
}

.contact-info-card h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.contact-detail {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 20px;
}

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

.contact-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.contact-text h4 {
    font-size: 1rem;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.contact-text p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.contact-form-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-md);
    padding: 30px;
    border: 1px solid var(--border-color);
}

.contact-form-card h3 {
    font-size: 1.3rem;
    margin-bottom: 25px;
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 500;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.2);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

.submit-btn {
    width: 100%;
    padding: 15px;
    background: var(--gradient-primary);
    color: var(--text-primary);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
}

.submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ========================================
   页脚
   ======================================== */
.site-footer {
    background: var(--darker-bg);
    border-top: 1px solid var(--border-color);
    padding-top: 60px;
}

.footer-main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

.footer-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 20px;
}

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

.footer-menu li {
    margin-bottom: 12px;
}

.footer-menu a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: var(--transition-fast);
}

.footer-menu a:hover {
    color: var(--accent-color);
}

.contact-info p {
    color: var(--text-secondary);
    margin-bottom: 10px;
    font-size: 0.95rem;
}

.legal-links li {
    margin-bottom: 12px;
}

.legal-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.footer-bottom {
    margin-top: 40px;
    padding: 25px 20px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.copyright {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ========================================
   响应式设计 - 平板端
   ======================================== */
@media (min-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: row;
        justify-content: center;
    }
    
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .video-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .features-grid,
    .elements-grid,
    .themes-grid,
    .types-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .process-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .team-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .requirements-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .screenshots-gallery {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .download-buttons {
        flex-direction: row;
    }
    
    .footer-main {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ========================================
   响应式设计 - 桌面端
   ======================================== */
@media (min-width: 1024px) {
    .mobile-menu-toggle {
        display: none;
    }
    
    .nav-menu {
        display: flex;
        position: static;
        background: transparent;
        padding: 0;
        flex-direction: row;
        gap: 5px;
        overflow: visible;
    }
    
    .nav-item a {
        padding: 10px 18px;
        font-size: 0.95rem;
    }
    
    .hero-content {
        flex-direction: row;
        align-items: center;
    }
    
    .hero-text {
        text-align: left;
        flex: 1;
    }
    
    .hero-image {
        flex: 1;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-buttons {
        justify-content: flex-start;
    }
    
    .section-title {
        font-size: 2.2rem;
    }
    
    .page-title {
        font-size: 2.5rem;
    }
    
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .video-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .intro-content {
        flex-direction: row;
        align-items: center;
    }
    
    .intro-content.reverse {
        flex-direction: row-reverse;
    }
    
    .intro-image,
    .intro-text {
        flex: 1;
    }
    
    .features-grid,
    .elements-grid,
    .themes-grid,
    .types-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .process-steps {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .team-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .contact-content {
        flex-direction: row;
    }
    
    .contact-info-card,
    .contact-form-card {
        flex: 1;
    }
    
    .app-hero-content {
        flex-direction: row;
        align-items: center;
    }
    
    .app-info {
        flex: 1;
    }
    
    .app-preview {
        flex: 1;
    }
    
    .app-title {
        font-size: 2.5rem;
    }
    
    .footer-main {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }
}

/* ========================================
   响应式设计 - 大屏幕
   ======================================== */
@media (min-width: 1400px) {
    .hero-title {
        font-size: 3.5rem;
    }
    
    .section-title {
        font-size: 2.5rem;
    }
    
    .services-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .features-grid,
    .elements-grid,
    .themes-grid,
    .types-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

/* ========================================
   动画效果
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
}

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

.animate-pulse {
    animation: pulse 2s infinite;
}

/* ========================================
   辅助类
   ======================================== */
.text-center {
    text-align: center;
}

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

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

.mt-20 {
    margin-top: 20px;
}

.mb-20 {
    margin-bottom: 20px;
}

.hidden {
    display: none;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ========================================
   打印样式
   ======================================== */
@media print {
    .site-header,
    .site-footer,
    .cta-section,
    .download-cta {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .main-content {
        padding-top: 0;
    }
}