:root {
    /* 颜色变量 */
    --primary-color: #2563EB;
    --primary-light: #3B82F6;
    --primary-dark: #1D4ED8;
    --accent-color: #F59E0B;
    --success-color: #10B981;
    
    /* 背景颜色 */
    --bg-light: #F8FAFC;
    --bg-medium: #EFF6FF;
    
    /* 文本颜色 */
    --text-primary: #0F172A;
    --text-secondary: #334155;
    --text-light: #64748B;
    --white: #ffffff;
    
    /* UI元素 */
    --border-radius: 12px;
    --border-radius-sm: 6px;
    --shadow-md: 0 10px 25px rgba(37, 99, 235, 0.12);
    --shadow-lg: 0 20px 40px rgba(37, 99, 235, 0.15);
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-light);
    color: var(--text-primary);
    line-height: 1.6;
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    overflow-x: hidden;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* 排版 */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Montserrat', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.3;
}

/* 通用背景图案 */
.pattern-bg {
    position: relative;
    overflow: hidden;
}

.pattern-bg:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.04;
    background-image: 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='%232563EB' fill-opacity='1'%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");
    z-index: -1;
}

/* 头部导航 */
header {
    background-color: var(--white);
    box-shadow: 0 4px 20px rgba(37, 99, 235, 0.08);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 5px 0;
    height: auto;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.logo img {
    width: 240px;
    height: auto;
}

/* 导航容器 */
.nav-container {
    display: flex;
    align-items: center;
    gap: 2rem;
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}

.nav-item {
    position: relative;
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    position: relative;
    padding: 0.5rem 0;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.nav-link:after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link:hover:after {
    width: 100%;
}

.dropdown-icon {
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.nav-item:hover .dropdown-icon {
    transform: rotate(180deg);
}

/* 下拉菜单 */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    padding: 0.5rem 0;
    min-width: 220px;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    transition: var(--transition);
}

.nav-item:hover .dropdown-menu,
.nav-item.active .dropdown-menu {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.dropdown-item {
    padding: 0.5rem 1.5rem;
    font-size: 0.95rem;
    display: block;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
}

.dropdown-item:hover {
    background-color: var(--bg-medium);
    color: var(--primary-color);
}

/* 语言选择器 */
.language-selector {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 8px;
    transition: var(--transition);
    margin-left: 0.5rem;
}

.language-selector:hover {
    background-color: rgba(37, 99, 235, 0.05);
}

.language-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
}

.language-current {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.language-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    padding: 0.5rem;
    min-width: 180px;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    transition: var(--transition);
}

.language-selector:hover .language-dropdown,
.language-selector.active .language-dropdown {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

.language-option {
    padding: 0.5rem 1rem;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-primary);
    transition: var(--transition);
    border-radius: var(--border-radius-sm);
    text-decoration: none;
}

.language-option:hover {
    background-color: var(--bg-medium);
    color: var(--primary-color);
}

.language-option.active {
    background-color: var(--bg-medium);
    color: var(--primary-color);
    font-weight: 500;
}

/* 国旗图标 */
.language-flag {
    width: 24px;
    height: 18px;
    object-fit: cover;
    border-radius: 2px;
}

/* 用户操作按钮 */
.user-actions {
    display: flex;
    gap: 0.75rem;
    margin-left: 2rem;
}

.user-btn {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.login-btn {
    background-color: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.login-btn:hover {
    background-color: rgba(37, 99, 235, 0.05);
}

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

.signup-btn:hover {
    background-color: var(--primary-dark);
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
    display: none;
    width: 24px;
    height: 24px;
    flex-direction: column;
    justify-content: space-around;
    cursor: pointer;
    z-index: 1001;
}

.mobile-menu-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--primary-color);
    transition: all 0.3s;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* 英雄区 */
.hero {
    padding: 8rem 0 2rem;
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, #f8fafc 0%, #eff6ff 100%);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-block;
    background: rgba(245, 158, 11, 0.15);
    color: var(--accent-color);
    padding: 0.5rem 1.25rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    transform: translateY(0);
    animation: float 3s ease-in-out infinite;
    box-shadow: 0 4px 15px rgba(217, 119, 6, 0.1);
}

@keyframes float {
    0% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0); }
}

.hero-title {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1rem;
    color: var(--text-primary);
    animation: fadeIn 0.8s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.hero-subtitle {
    font-size: 1.6rem;
    margin-bottom: 1.75rem;
    color: var(--primary-color);
    position: relative;
    display: inline-block;
    animation: fadeIn 0.8s ease-out 0.2s forwards;
    opacity: 0;
}

.hero-subtitle:after {
    content: '';
    position: absolute;
    width: 100%;
    height: 8px;
    bottom: 4px;
    left: 0;
    background-color: rgba(37, 99, 235, 0.1);
    z-index: -1;
    border-radius: 4px;
}

.hero-desc {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeIn 0.8s ease-out 0.4s forwards;
    opacity: 0;
}

/* 搜索区域 */
.search-container {
    max-width: 100%;
    margin-bottom: 1.75rem;
    animation: fadeIn 0.8s ease-out 0.6s forwards;
    opacity: 0;
    width: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.search-row {
    display: flex;
    width: 100%;
    margin-bottom: 1rem;
    max-width: 1000px;
}

.search-input-wrapper {
    display: flex;
    flex: 1;
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(37, 99, 235, 0.15);
    border: 1px solid rgba(37, 99, 235, 0.08);
    transition: var(--transition);
    width: 100%;
}

.search-input-wrapper:focus-within {
    box-shadow: 0 15px 40px rgba(37, 99, 235, 0.2);
    transform: translateY(-3px);
}

.search-input {
    flex: 1;
    padding: 1.2rem 1.5rem;
    border: none;
    font-size: 1.1rem;
    outline: none;
    color: var(--text-primary);
    width: 100%;
}

.search-input::placeholder {
    color: var(--text-light);
}

.search-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0 1.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.search-button:hover {
    background-color: var(--primary-dark);
}

/* 文件类型选择器 */
.file-type-container {
    display: flex;
    margin-left: 1rem;
    gap: 0.5rem;
}

/* 通用按钮样式 */
.btn {
    border: none;
    border-radius: var(--border-radius-sm);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn:hover {
    transform: translateY(-3px);
}

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

.btn-primary:hover {
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.2);
}

.btn-primary.active {
    background-color: var(--primary-dark);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.3);
}

.btn-success {
    background-color: var(--success-color);
    color: white;
}

.btn-success:hover {
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.2);
}

/* 文件类型按钮 */
.file-type-btn {
    background-color: var(--primary-light);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.file-type-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.2);
}

.file-type-btn.active {
    background-color: var(--primary-dark);
    box-shadow: 0 8px 25px rgba(37, 99, 235, 0.3);
}

.file-type-btn svg {
    width: 16px;
    height: 16px;
}

.settings-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    background-color: var(--success-color);
    color: white;
    border: none;
    width: auto;
    padding: 15px 25px;
    font-size: 16px;
    font-weight: 500;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    margin-left: auto;
    margin-right: 0;
}

.settings-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(16, 185, 129, 0.2);
}

/* 功能特性部分 */
.features, .platforms {
    padding: 4rem 0;
    position: relative;
}

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

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

/* 章节标题样式 */
.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    position: relative;
    padding-bottom: 0.75rem;
    letter-spacing: -0.5px;
}

.section-title span {
    color: var(--primary-color);
    position: relative;
    z-index: 1;
}

.section-title span::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 8px;
    bottom: 6px;
    left: 0;
    background-color: rgba(37, 99, 235, 0.08);
    z-index: -1;
    border-radius: 4px;
}

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto 2rem;
    line-height: 1.5;
}

/* 通用卡片样式 */
.card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    border: 1px solid rgba(37, 99, 235, 0.05);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

/* 功能卡片 */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1.5rem;
    margin-top: 1rem;
}

.feature-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    border: 1px solid rgba(37, 99, 235, 0.05);
    padding: 2.5rem 1.2rem;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    text-align: center;
    z-index: 1;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.feature-card:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 6px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    z-index: 1;
}

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--bg-light), var(--bg-medium));
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    position: relative;
    font-size: 1.75rem;
    color: var(--primary-color);
    box-shadow: 0 8px 20px rgba(37, 99, 235, 0.1);
}

.feature-icon:before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 18px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    opacity: 0.12;
}

.feature-card h3 {
    font-size: 1.3rem;
    margin-bottom: 0.8rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    flex-grow: 1;
    margin-bottom: 0;
    line-height: 1.6;
    font-size: 0.95rem;
    text-align: justify;
}

/* 平台卡片 */
.platform-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.platform-card {
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    position: relative;
    border: 1px solid rgba(37, 99, 235, 0.05);
    padding: 1.2rem 0.8rem;
    text-align: center;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.platform-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.platform-card::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), transparent);
    opacity: 0;
    transition: var(--transition);
}

.platform-card:hover::after {
    opacity: 1;
}

.platform-icon {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(59, 130, 246, 0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--primary-color);
    margin: 0 auto 0.8rem;
    transition: var(--transition);
}

.platform-card:hover .platform-icon {
    transform: scale(1.1) rotate(5deg);
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1), rgba(59, 130, 246, 0.2));
}

.platform-card h4 {
    font-size: 0.95rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    transition: var(--transition);
}

.platform-card:hover h4 {
    color: var(--primary-color);
}

.platform-card p {
    color: var(--text-secondary);
    font-size: 0.75rem;
    line-height: 1.5;
    margin: 0;
}

/* 页脚 */
footer {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    color: var(--white);
    padding: 1rem 0;
    position: relative;
    overflow: hidden;
    text-align: center;
}

footer:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 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='%23ffffff' fill-opacity='0.05'%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");
    z-index: 0;
}

.footer-content {
    position: relative;
    z-index: 1;
}

.footer-website {
    color: rgba(255, 255, 255, 0.7);
    font-size: 1rem;
    margin-top: 0.5rem;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2000;
    overflow-y: auto;
}

.modal-content {
    position: relative;
    background-color: #f1f1f1;
    margin: 5% auto;
    width: 90%;
    max-width: 600px;
    border-radius: 12px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    animation: modalOpen 0.3s ease-out;
}

@keyframes modalOpen {
    from { opacity: 0; transform: translateY(-20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 模态框头部 */
.modal-header {
    background-color: #e8e8e8;
    padding: 15px 20px;
    position: relative;
}

.modal-title {
    display: flex;
    flex-direction: column;
}

.settings-icon {
    display: inline-block;
    vertical-align: middle;
    margin-right: 10px;
    color: #666;
}

.version {
    font-size: 0.8rem;
    color: #666;
    margin-bottom: 5px;
}

.modal-title h2 {
    margin: 0;
    display: flex;
    align-items: center;
    font-size: 1.6rem;
    color: #333;
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 1.8rem;
    font-weight: bold;
    color: #666;
    cursor: pointer;
    transition: color 0.2s;
}

.modal-close:hover {
    color: #000;
}

/* 模态框内容 */
.modal-body {
    padding: 20px;
    max-height: 70vh;
    overflow-y: auto;
}

/* 选项卡导航 */
.modal-tabs {
    display: flex;
    background-color: #e0e0e0;
    border-radius: 8px;
    margin-bottom: 20px;
    overflow: hidden;
}

.tab-btn {
    background-color: transparent;
    border: none;
    padding: 12px 20px;
    cursor: pointer;
    flex-grow: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 0.9rem;
    color: #444;
    transition: all 0.2s;
}

.tab-btn svg {
    opacity: 0.7;
}

.tab-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.tab-btn.active {
    background-color: #111;
    color: white;
}

.tab-btn.active svg {
    opacity: 1;
    color: white;
}

/* 选项卡内容 */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

/* 设置区域 */
.settings-section {
    margin-bottom: 24px;
    border-bottom: 1px solid #ddd;
    padding-bottom: 20px;
}

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

.settings-section h3 {
    font-size: 1.1rem;
    color: #444;
    margin-top: 0;
    margin-bottom: 12px;
}

/* 通用选项样式 */
.options-group {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 10px;
}

/* 选项按钮样式 */
.option-btn {
    background-color: #e0e0e0;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.option-btn:hover {
    background-color: #d0d0d0;
}

.option-btn.active {
    background-color: #111;
    color: white;
}

/* 质量按钮 */
.quality-options, .codec-options, .format-options, .appearance-options, .filename-options {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    margin-bottom: 10px;
}

.quality-btn, .codec-btn, .format-btn, .theme-btn, .filename-btn {
    background-color: #e0e0e0;
    border: none;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s;
}

.quality-btn:hover, .codec-btn:hover, .format-btn:hover, .theme-btn:hover, .filename-btn:hover {
    background-color: #d0d0d0;
}

.quality-btn.active, .codec-btn.active, .format-btn.active, .theme-btn.active, .filename-btn.active {
    background-color: #111;
    color: white;
}

/* 信息文本样式 */
.info-text {
    font-size: 0.9rem;
    margin: 8px 0;
    color: #555;
}

.codec-info p, .filename-info p {
    font-size: 0.9rem;
    margin: 8px 0;
    color: #555;
}

/* 通用信息文本样式 */
.info-text {
    font-size: 0.9rem;
    margin: 8px 0;
    color: #555;
}

/* 复选框选项 */
.checkbox-option {
    display: flex;
    align-items: center;
    margin: 10px 0;
}

.checkbox-option input[type="checkbox"] {
    margin-right: 8px;
    width: 18px;
    height: 18px;
}

.checkbox-option label {
    font-size: 0.95rem;
    cursor: pointer;
}

/* 说明文本 */
.settings-note {
    font-size: 0.85rem;
    color: #666;
    margin: 8px 0;
    line-height: 1.4;
}

/* 文件名预览 */
.filename-preview {
    background-color: #e8e8e8;
    border-radius: 8px;
    padding: 12px;
    margin: 12px 0;
}

.preview-item {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
}

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

.preview-icon {
    margin-right: 10px;
    font-size: 1.2rem;
}

.preview-text {
    font-family: monospace;
    font-size: 0.9rem;
    color: #333;
}

/* 通用信息文本样式 */
.info-text {
    font-size: 0.9rem;
    margin: 8px 0;
    color: #555;
}

/* 应用通用信息样式 */
.codec-info p, 
.filename-info p {
    font-size: 0.9rem;
    margin: 8px 0;
    color: #555;
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .hero-title {
        font-size: 3.5rem;
    }
    
    .feature-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .platform-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 992px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .platform-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .search-row {
        flex-direction: column;
    }
    
    .file-type-container {
        margin-left: 0;
        margin-top: 0.5rem;
        justify-content: space-between;
    }
    
    .file-type-btn {
        flex: 1;
    }
    
    /* 移动端菜单样式 */
    .nav-container {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background-color: var(--white);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        z-index: 1000;
        overflow-y: auto;
        padding: 2rem;
    }
    
    .nav-container.active {
        display: flex;
    }
    
    .nav-menu {
        flex-direction: column;
        width: 100%;
        gap: 1.5rem;
    }
    
    .nav-item {
        width: 100%;
    }
    
    .nav-link {
        width: 100%;
        justify-content: space-between;
        padding: 0.75rem 0;
        border-bottom: 1px solid rgba(37, 99, 235, 0.1);
    }
    
    .dropdown-menu {
        position: static;
        box-shadow: none;
        opacity: 1;
        pointer-events: auto;
        transform: none;
        padding: 0;
        margin-top: 0.5rem;
        display: none;
    }
    
    .nav-item.active .dropdown-menu {
        display: block;
    }
    
    .dropdown-item {
        padding: 0.75rem 1.5rem;
        border-left: 2px solid var(--primary-light);
        margin: 0.25rem 0;
        margin-left: 1rem;
    }
    
    .user-actions {
        flex-direction: column;
        width: 100%;
        gap: 1rem;
        margin-left: 0;
    }
    
    .user-btn {
        width: 100%;
        justify-content: center;
        padding: 0.75rem 1.5rem;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .language-selector {
        margin-top: 1rem;
        margin-left: 0;
    }
    
    .language-dropdown {
        position: static;
        opacity: 1;
        transform: none;
        pointer-events: auto;
        margin-top: 1rem;
        box-shadow: none;
        border: 1px solid rgba(37, 99, 235, 0.1);
        display: none;
    }
    
    .language-selector.active .language-dropdown {
        display: block;
    }
}

@media (max-width: 768px) {
    .header-content {
        padding: 1rem 0;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        font-size: 1.4rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
        max-width: 550px;
        margin: 0 auto;
    }
    
    .platform-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* 在较小屏幕上保持设置按钮居中 */
    .settings-button {
        margin: 0 auto;
        width: 100%;
        max-width: 300px;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 1.5rem;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.3rem;
    }
    
    .hero-desc {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .platform-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .platform-card {
        padding: 1rem 0.7rem;
    }
}

/* 通用信息文本样式 */
.info-text {
    font-size: 0.9rem;
    margin: 8px 0;
    color: #555;
}