/* 基础变量 */
:root {
    --primary-purple: #667EEA;
    --primary-violet: #FF6B35;
    --gradient-primary: linear-gradient(135deg, #667EEA 0%, #FF6B35 100%);
    --gradient-btn: linear-gradient(135deg, #667EEA 0%, #FF6B35 100%);
    --gradient-text: linear-gradient(135deg, #667EEA 0%, #FF6B35 100%);
    --bg-dark: #0d1117;
    --bg-darker: #010409;
    --bg-card: #161b22;
    --bg-card-hover: #1c2128;
    --bg-tertiary: #21262d;
    --border-color: #30363d;
    --text-primary: #f0f6fc;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 按钮 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: var(--border-radius);
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.35);
}

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

.btn-secondary:hover {
    background-color: rgba(102, 126, 234, 0.1);
    transform: translateY(-2px);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(13, 17, 23, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
	width:64px;
	height:64px;
}

.logo-icon img {
	width:100%;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 10px 20px;
    font-size: 16px;
    font-weight: 500;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--text-primary);
    background-color: var(--bg-card);
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.language-selector {
    position: relative;
}

.lang-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

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

.lang-btn .arrow {
    font-size: 10px;
    transition: var(--transition);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    min-width: 140px;
    max-height: 300px;
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    z-index: 1000;
}

.lang-dropdown::-webkit-scrollbar {
    width: 6px;
}

.lang-dropdown::-webkit-scrollbar-track {
    background: transparent;
}

.lang-dropdown::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.lang-dropdown::-webkit-scrollbar-thumb:hover {
    background: var(--primary-purple);
}

.language-selector:hover .lang-dropdown,
.lang-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-item {
    padding: 10px 16px;
    font-size: 14px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.lang-item:hover,
.lang-item.active {
    background-color: var(--bg-tertiary);
    color: var(--primary-purple);
}

.lang-item:first-child {
    border-radius: 8px 8px 0 0;
}

.lang-item:last-child {
    border-radius: 0 0 8px 8px;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    transition: var(--transition);
}

.mobile-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--bg-dark);
    border-bottom: 1px solid var(--border-color);
    padding: 16px 24px;
}

.mobile-menu.active {
    display: block;
}

.mobile-nav-links {
	display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.mobile-nav-link {
    padding: 12px 16px;
    font-size: 15px;
    color: var(--text-secondary);
    border-radius: 8px;
    transition: var(--transition);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    background-color: var(--bg-card);
    color: var(--primary-purple);
}

.mobile-language-selector {
    margin-top: 20px;
}

.mobile-lang-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.mobile-lang-header:hover {
    border-color: var(--primary-purple);
}

.mobile-lang-current {
    font-size: 15px;
    color: var(--text-primary);
}

.mobile-lang-arrow {
    font-size: 10px;
    color: var(--text-muted);
    transition: var(--transition);
}

.mobile-lang-header.active .mobile-lang-arrow {
    transform: rotate(180deg);
}

.mobile-lang-dropdown {
    display: none;
    flex-direction: column;
    gap: 4px;
    margin-top: 8px;
    max-height: 200px;
    overflow-y: auto;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 8px;
}

.mobile-lang-dropdown.show {
    display: flex;
}

.mobile-lang-item {
    padding: 10px 12px;
    font-size: 14px;
    color: var(--text-secondary);
    border-radius: 6px;
    cursor: pointer;
    transition: var(--transition);
}

.mobile-lang-item:hover,
.mobile-lang-item.active {
    background-color: var(--bg-tertiary);
    color: var(--primary-purple);
}

/* Hero区域 */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
    background: var(--bg-darker);
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    pointer-events: none;
}

.glow-1 {
    top: -200px;
    right: -100px;
    width: 600px;
    height: 600px;
    background: radial-gradient(ellipse at center, rgba(102, 126, 234, 0.15) 0%, transparent 70%);
}

.glow-2 {
    bottom: -200px;
    left: -100px;
    width: 500px;
    height: 500px;
    background: radial-gradient(ellipse at center, rgba(255, 107, 53, 0.1) 0%, transparent 70%);
}

.hero-grid {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(102, 126, 234, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(102, 126, 234, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

.hero-content {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    gap: 80px;
}

.hero-left {
    flex: 1;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(255, 107, 53, 0.1) 100%);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: 24px;
    font-size: 15px;
    font-weight: 500;
    color: var(--primary-purple);
    margin-bottom: 24px;
}

.tag-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--gradient-primary);
    animation: pulse 2s infinite;
}

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

.hero-title {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
}

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

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.6;
}

.hero-description {
    font-size: 15px;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 32px;
}

.hero-description strong {
    color: var(--primary-purple);
}

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

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-number {
    font-size: 32px;
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.hero-right {
    flex: 1;
    display: flex;
    justify-content: center;
}

.hero-visual {
    position: relative;
    width: 100%;
    max-width: 500px;
}

.convert-demo {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.demo-header {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    background-color: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.demo-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.demo-dot.red { background: #ff5f56; }
.demo-dot.yellow { background: #ffbd2e; }
.demo-dot.green { background: #27ca40; }

.demo-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    padding: 40px 20px;
}

.demo-from, .demo-to {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.file-icon {
    width: 64px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 600;
}

.file-icon.pdf {
    background: linear-gradient(135deg, #FF6B6B 0%, #EE5A5A 100%);
    color: white;
}

.file-icon.word {
    background: linear-gradient(135deg, #4285F4 0%, #2B6CB0 100%);
    color: white;
}

.file-name {
    font-size: 13px;
    color: var(--text-secondary);
}

.convert-arrow {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.ai-badge {
    position: absolute;
    top: -8px;
    right: -16px;
    padding: 2px 6px;
    background: var(--gradient-btn);
    border-radius: 4px;
    font-size: 10px;
    font-weight: 600;
    color: white;
}

.demo-progress {
    padding: 16px;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
}

.progress-bar {
    height: 4px;
    background-color: var(--bg-card);
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-fill {
    height: 100%;
    width: 99%;
    background: var(--gradient-btn);
    border-radius: 2px;
    animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
    0% { width: 0%; }
    100% { width: 99%; }
}

.progress-text {
    font-size: 12px;
    color: var(--primary-purple);
}

.floating-card {
    position: absolute;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 16px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    box-shadow: var(--shadow-md);
    animation: float 3s ease-in-out infinite;
}

.card-icon {
    font-size: 20px;
}

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

.card-1 {
    top: -20px;
    right: -30px;
    animation-delay: 0s;
}

.card-2 {
    bottom: 80px;
    left: -40px;
    animation-delay: 0.5s;
}

.card-3 {
    bottom: -20px;
    right: 20px;
    animation-delay: 1s;
}

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

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    cursor: pointer;
}

.mouse-scroll {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.mouse {
    width: 26px;
    height: 42px;
    border: 2px solid var(--primary-purple);
    border-radius: 13px;
    position: relative;
    background: rgba(102, 126, 234, 0.05);
}

.wheel {
    width: 4px;
    height: 8px;
    background: var(--primary-purple);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll-wheel 1.5s infinite;
}

@keyframes scroll-wheel {
    0% {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
    100% {
        opacity: 0;
        transform: translateX(-50%) translateY(12px);
    }
}

.scroll-arrows {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.scroll-arrow {
    width: 10px;
    height: 10px;
    border-right: 2px solid var(--primary-purple);
    border-bottom: 2px solid var(--primary-purple);
    transform: rotate(45deg);
    animation: scroll-arrow 1.5s infinite;
    opacity: 0;
}

.scroll-arrow:nth-child(1) { animation-delay: 0s; }
.scroll-arrow:nth-child(2) { animation-delay: 0.15s; }
.scroll-arrow:nth-child(3) { animation-delay: 0.3s; }

@keyframes scroll-arrow {
    0% {
        opacity: 0;
        transform: rotate(45deg) translate(-5px, -5px);
    }
    50% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: rotate(45deg) translate(5px, 5px);
    }
}

/* 区块通用样式 */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(255, 107, 53, 0.1) 100%);
    border: 1px solid rgba(102, 126, 234, 0.2);
    border-radius: 24px;
    font-size: 16px;
    font-weight: 500;
    color: var(--primary-purple);
    margin-bottom: 16px;
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

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

/* 格式支持 */
.formats {
    padding: 100px 0;
    background-color: var(--bg-dark);
}

.format-categories {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.format-category {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 28px;
    transition: var(--transition);
}

.format-category:hover {
    border-color: var(--primary-purple);
    box-shadow: var(--shadow-md);
}

.category-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 20px;
}

.category-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
}

.category-icon.doc {
    background: linear-gradient(135deg, rgba(66, 133, 244, 0.15) 0%, rgba(66, 133, 244, 0.05) 100%);
    color: #4285F4;
}

.category-icon.img {
    background: linear-gradient(135deg, rgba(52, 168, 83, 0.15) 0%, rgba(52, 168, 83, 0.05) 100%);
    color: #34A853;
}

.category-icon.audio {
    background: linear-gradient(135deg, rgba(251, 188, 4, 0.15) 0%, rgba(251, 188, 4, 0.05) 100%);
    color: #FBBC04;
}

.category-icon.other {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.15) 0%, rgba(102, 126, 234, 0.05) 100%);
    color: var(--primary-purple);
}

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

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

.format-tag {
    padding: 7px 20px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 30px;
    font-size: 16px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.format-tag:hover {
    border-color: var(--primary-purple);
    color: var(--primary-purple);
}

/* 核心功能 */
.features {
    padding: 100px 0;
    background-color: var(--bg-darker);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.feature-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
}

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

.feature-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(255, 107, 53, 0.1) 100%);
    border-radius: 16px;
    margin: 0 auto 20px;
    color: var(--primary-purple);
}

.feature-title {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.feature-desc {
    font-size: 16px;
    color: var(--text-muted);
    line-height: 1.8;
}

/* 简单三步 */
.steps {
    padding: 100px 0;
    background: linear-gradient(180deg, var(--bg-darker) 0%, var(--bg-primary) 100%);
}

.steps-container {
    display: flex;
    align-items: stretch;
    justify-content: center;
    gap: 0;
    margin-bottom: 48px;
}

.step-card {
    flex: 1;
    max-width: 320px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 32px 24px;
    text-align: center;
    position: relative;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.step-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary-purple);
    box-shadow: var(--shadow-lg), 0 0 40px rgba(102, 126, 234, 0.15);
}

.step-number {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-btn);
    border-radius: 50%;
    font-size: 16px;
    font-weight: 700;
    color: white;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.4);
}

.step-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(255, 107, 53, 0.1) 100%);
    border-radius: 20px;
    margin: 16px auto 20px;
    color: var(--primary-purple);
    transition: var(--transition);
}

.step-card:hover .step-icon {
    background: var(--gradient-btn);
    color: white;
    transform: scale(1.1);
}

.step-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.step-desc {
    font-size: 16px;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 20px;
}

.step-visual {
    padding: 16px;
    background-color: var(--bg-tertiary);
    border-radius: 12px;
    border: 1px dashed var(--border-color);
    min-height: 80px;
    margin-top: auto;
    display: flex;
    align-items: center;
    justify-content: center;
}

.upload-demo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 12px;
}

.upload-demo .upload-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(102, 126, 234, 0.15);
    border-radius: 50%;
    color: var(--primary-purple);
}

.upload-demo span {
    font-size: 12px;
    color: var(--text-muted);
}

.format-demo {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.format-option {
    padding: 6px 14px;
    font-size: 14px;
    font-weight: 500;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.format-option.selected {
    background: var(--gradient-btn);
    color: white;
}

.convert-demo-mini {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.convert-progress {
    width: 100%;
    height: 8px;
    background-color: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill-mini {
    height: 100%;
    width: 100%;
    background: linear-gradient(90deg, #10B981 0%, #059669 100%);
    border-radius: 4px;
    animation: fillProgress 1.5s ease-out forwards;
}

@keyframes fillProgress {
    from {
        width: 0;
    }
    to {
        width: 100%;
    }
}

.convert-status {
    font-size: 12px;
    font-weight: 600;
    color: #10B981;
}

.step-connector {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0 16px;
    align-self: center;
    flex-shrink: 0;
}

.connector-line {
    width: 60px;
    height: 2px;
    background: linear-gradient(90deg, var(--primary-purple) 0%, var(--primary-blue) 100%);
    position: relative;
}

.connector-arrow {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--primary-purple);
    margin-top: -16px;
}

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

.btn-large {
    padding: 16px 40px;
    font-size: 20px;
}

/* AI技术 */
.ai-tech {
    padding: 100px 0;
    background-color: var(--bg-dark);
}

.ai-content {
    display: flex;
    gap: 60px;
    align-items: center;
}

.ai-left {
    flex: 1;
}

.ai-features {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 32px;
}

.ai-feature-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
    padding: 20px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.ai-feature-item:hover {
    border-color: var(--primary-purple);
}

.ai-feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.15) 0%, rgba(255, 107, 53, 0.15) 100%);
    border-radius: 12px;
    color: var(--primary-purple);
    flex-shrink: 0;
}

.ai-feature-info h4 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.ai-feature-info p {
    font-size: 16px;
    color: var(--text-muted);
}

.ai-stats {
    display: flex;
    gap: 24px;
    padding: 24px;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(255, 107, 53, 0.05) 100%);
    border: 1px solid rgba(102, 126, 234, 0.15);
    border-radius: var(--border-radius);
}

.ai-stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    flex: 1;
}

.ai-stat-num {
    font-size: 28px;
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.ai-stat-text {
    font-size: 13px;
    color: var(--text-muted);
}

.ai-right {
    flex: 1;
    display: flex;
    justify-content: center;
}

.ai-visual {
    position: relative;
    width: 400px;
    height: 400px;
}

.ai-brain {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.brain-core {
    width: 100px;
    height: 100px;
    background: var(--gradient-btn);
    border-radius: 50%;
    box-shadow: 0 0 40px rgba(102, 126, 234, 0.5);
    animation: pulse-core 2s ease-in-out infinite;
}

@keyframes pulse-core {
    0%, 100% { transform: scale(1); box-shadow: 0 0 40px rgba(102, 126, 234, 0.5); }
    50% { transform: scale(1.1); box-shadow: 0 0 60px rgba(102, 126, 234, 0.7); }
}

.brain-ring {
    position: absolute;
    border: 2px solid rgba(102, 126, 234, 0.3);
    border-radius: 50%;
    animation: rotate-ring 10s linear infinite;
}

.ring-1 {
    width: 160px;
    height: 160px;
    animation-duration: 8s;
}

.ring-2 {
    width: 240px;
    height: 240px;
    animation-duration: 12s;
    animation-direction: reverse;
}

.ring-3 {
    width: 350px;
    height: 350px;
    animation-duration: 16s;
}

@keyframes rotate-ring {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.brain-node {
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--gradient-btn);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(102, 126, 234, 0.5);
}

.node-1 { top: 20px; left: 50%; transform: translateX(-50%); }
.node-2 { top: 50%; right: 20px; transform: translateY(-50%); }
.node-3 { bottom: 20px; left: 50%; transform: translateX(-50%); }
.node-4 { top: 50%; left: 20px; transform: translateY(-50%); }
.node-5 { top: 60px; right: 60px; }
.node-6 { bottom: 60px; left: 60px; }

.ai-label {
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 14px;
    font-weight: 600;
    color: var(--primary-purple);
    letter-spacing: 2px;
}

/* 下载区域 */
.download {
    padding: 100px 0;
    background: linear-gradient(135deg, var(--bg-darker) 0%, var(--bg-dark) 100%);
    position: relative;
    overflow: hidden;
}

.download::before {
    content: '';
    position: absolute;
    top: -200px;
    right: -200px;
    width: 500px;
    height: 500px;
    background: radial-gradient(ellipse at center, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.download-content {
    display: flex;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.download-left {
    flex: 1;
}

.download-title {
    font-size: 40px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.download-desc {
    font-size: 16px;
    color: var(--text-muted);
    line-height: 1.8;
    margin-bottom: 32px;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 24px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.download-btn:hover {
    border-color: var(--primary-purple);
    transform: translateX(8px);
    box-shadow: var(--shadow-md);
}

.download-btn.primary {
    background: var(--gradient-btn);
    border: none;
}

.download-btn.primary:hover {
    transform: translateX(8px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.3);
}

.download-btn.primary .btn-icon,
.download-btn.primary .btn-label,
.download-btn.primary .btn-size {
    color: white;
}

.download-btn.web-btn {
    background: linear-gradient(135deg, #10B981 0%, #059669 100%);
    border: none;
}

.download-btn.web-btn:hover {
    transform: translateX(8px);
    box-shadow: 0 8px 24px rgba(16, 185, 129, 0.3);
}

.download-btn.web-btn .btn-icon,
.download-btn.web-btn .btn-label,
.download-btn.web-btn .btn-size {
    color: white;
}

.download-btn.web-btn .btn-icon {
    background: rgba(255, 255, 255, 0.2);
}

.btn-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 12px;
    color: var(--primary-purple);
    flex-shrink: 0;
}
.btn-icon img {
	width:70%;
}

.download-btn.primary .btn-icon {
    background: rgba(255, 255, 255, 0.2);
}

.btn-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

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

.btn-size {
    font-size: 15px;
    color: var(--text-muted);
}

.download-right {
    flex: 1;
    display: flex;
    justify-content: center;
}

.download-preview {
    width: 100%;
    max-width: 440px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.preview-header {
    display: flex;
    gap: 8px;
    padding: 12px 16px;
    background-color: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.preview-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--border-color);
}

.preview-dot:nth-child(1) { background: #ff5f56; }
.preview-dot:nth-child(2) { background: #ffbd2e; }
.preview-dot:nth-child(3) { background: #27ca40; }

.preview-content {
    padding: 24px;
}

.preview-dropzone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 20px;
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 20px;
    color: var(--text-muted);
    transition: var(--transition);
}

.preview-dropzone:hover {
    border-color: var(--primary-purple);
    color: var(--primary-purple);
}

.dropzone-text {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-top: 12px;
}

.dropzone-hint {
    font-size: 12px;
    color: var(--text-muted);
    margin-top: 4px;
}

.preview-options {
    margin-bottom: 20px;
}

.option-row {
    display: flex;
    align-items: center;
    gap: 12px;
}

.option-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.option-select {
    flex: 1;
    padding: 10px 12px;
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

.option-select:hover {
    border-color: var(--primary-purple);
}

.preview-btn {
    width: 100%;
    padding: 18px;
    background: var(--gradient-btn);
    border: none;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    color: white;
    cursor: pointer;
    transition: var(--transition);
}

.preview-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.3);
}

/* 页脚 */
.footer {
    padding: 60px 0 30px;
    background-color: var(--bg-darker);
    border-top: 1px solid var(--border-color);
}

.footer-languages {
    padding-bottom: 40px;
    margin-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
}

.languages-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 16px;
    text-align: center;
}

.languages-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.languages-list.expanded {
    max-height: 500px;
}

.languages-list .lang-item {
    padding: 6px 14px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-muted);
    transition: var(--transition);
}

.languages-list .lang-item:hover {
    border-color: var(--primary-purple);
    color: var(--primary-purple);
}

.languages-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin: 16px auto 0;
    padding: 8px 20px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 13px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.languages-toggle:hover {
    border-color: var(--primary-purple);
    color: var(--primary-purple);
}

.languages-toggle .toggle-arrow {
    font-size: 10px;
    transition: var(--transition);
}

.languages-toggle.expanded .toggle-arrow {
    transform: rotate(180deg);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-logo img {
	width:48px;
	height:48px;
}

.footer-logo span {
    font-size: 18px;
    font-weight: 700;
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-desc {
    font-size: 14px;
    color: var(--text-muted);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    gap: 80px;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.footer-col a {
    display: block;
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 10px;
    transition: var(--transition);
}

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

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

.footer-bottom p {
    font-size: 13px;
    color: var(--text-muted);
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    right: 30px;
    bottom: 30px;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-btn);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.3);
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.4);
}
.back-to-top img {
	width:70%;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-content {
        flex-direction: column;
        gap: 60px;
    }

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

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .format-categories {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .ai-content {
        flex-direction: column;
    }

    .download-content {
        flex-direction: column;
        gap: 50px;
    }
}

@media (max-width: 768px) {
    .nav-menu,
    .nav-right {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu {
        max-height: calc(100vh - 70px);
        overflow-y: auto;
    }

    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-stats {
        flex-wrap: wrap;
        gap: 24px;
    }

    .floating-card {
        display: none;
    }

    .scroll-indicator {
        bottom: 20px;
    }

    .section-title {
        font-size: 28px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .steps-container {
        flex-direction: column;
        align-items: stretch;
        gap: 32px;
    }

    .step-connector {
        transform: rotate(90deg);
        padding: 0;
        padding-top: 0;
        align-self: center;
    }

    .step-card {
        max-width: 100%;
        width: 100%;
        min-height: 380px;
    }

    .ai-stats {
        flex-wrap: wrap;
    }

    .ai-visual {
        width: 200px;
        height: 200px;
    }

    .footer-content {
        flex-direction: column;
        gap: 20px;
		margin-bottom: 10px;
    }

    .footer-links {
        flex-wrap: wrap;
        gap: 40px;
		display: none;
    }
	.ring-3 {
		width:240px;
		height:240px;
	}
	.ring-2 {
		width:200px;
		height:200px;
	}
	.brain-core {
		width:80px;
		height:80px;
	}
	.download-title {
		font-size:24px;
	}
	.footer-brand {
		max-width:100%;
		display:flex;
		justify-content: center;
		align-items: center;
		flex-direction: column;
	}
	.back-to-top {
		right:10px;
	}
	.footer-languages {
		padding-bottom:30px;
		margin-bottom: 30px;
	}
	.languages-toggle {
		display: flex;
	}
	.footer {
		padding-top:30px;
	}
	.download-right, .hero-right {
		width:100%;
	}
	.languages-list {
		max-height:90px;
	}
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-title {
        font-size: 28px;
    }

    .stat-number {
        font-size: 24px;
    }

    .download-preview {
        max-width: 100%;
    }
}