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

:root {
    --primary-color: #1a1a1a;
    --secondary-color: #6b7280;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --background-color: #ffffff;
    --surface-color: #f9fafb;
    --border-color: #e5e7eb;
    --hover-color: #f3f4f6;
    --shadow-light: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-large: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --gradient-primary: linear-gradient(135deg, var(--accent-color) 0%, #357abd 100%);
    --gradient-secondary: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Serif SC', serif;
    line-height: 1.6;
    color: var(--primary-color);
    background-color: var(--background-color);
    overflow-x: hidden;
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 2rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.nav-logo {
    font-size: 1.8rem;
    font-weight: 400;
    color: var(--primary-color);
    letter-spacing: 0.05em;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-subtitle {
    font-size: 0.9rem;
    color: var(--secondary-color);
    font-weight: 300;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: var(--secondary-color);
    font-weight: 400;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent-color);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--primary-color);
    transition: var(--transition);
}

/* 主容器 */
.main-container {
    margin-top: 70px;
}

/* 头部英雄区域 */
.header {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: linear-gradient(135deg, #f9fafb 0%, #ffffff 50%, #f3f4f6 100%);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23e5e7eb' fill-opacity='0.1' fill-rule='nonzero'%3E%3Ccircle cx='30' cy='30' r='2'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.hero-content {
    text-align: center;
    max-width: 800px;
    padding: 2rem;
    position: relative;
    z-index: 10;
    animation: fadeInUp 1s ease-out;
}

.logo-section {
    margin-bottom: 3rem;
    animation: fadeInDown 0.8s ease-out;
}

.logo-text {
    font-size: 4rem;
    font-weight: 300;
    color: var(--primary-color);
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.logo-chinese {
    font-size: 1.4rem;
    font-weight: 400;
    color: var(--secondary-color);
    letter-spacing: 0.3em;
}

.title-section {
    margin-bottom: 2.5rem;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.main-title {
    font-size: 2.5rem;
    font-weight: 500;
    color: var(--primary-color);
    margin-bottom: 1rem;
    letter-spacing: 0.05em;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--secondary-color);
    font-weight: 300;
}

.description {
    margin-bottom: 3rem;
    font-size: 1.1rem;
    color: var(--secondary-color);
    line-height: 1.8;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.cta-section {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    align-items: center;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.download-button,
.demo-button {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-family: inherit;
    font-weight: 500;
    text-decoration: none;
}

.download-button.primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-medium);
}

.download-button.primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-large);
}

.demo-button.secondary {
    background: var(--gradient-secondary);
    color: var(--primary-color);
    border: 1px solid var(--border-color);
}

.demo-button.secondary:hover {
    background: var(--hover-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.button-arrow {
    transition: var(--transition);
}

.download-button:hover .button-arrow,
.demo-button:hover .button-arrow {
    transform: translateX(3px);
}

/* 功能区域 */
.features-section {
    padding: 5rem 0;
    background: var(--background-color);
}

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

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 1rem;
    color: var(--primary-color);
    font-weight: 500;
}

.section-description {
    text-align: center;
    font-size: 1.1rem;
    color: var(--secondary-color);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-top: 3rem;
}

.feature-card {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 1.5rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-large);
    border-color: var(--accent-color);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.feature-card:hover .feature-icon {
    animation-play-state: paused;
    transform: scale(1.1) rotate(5deg);
}

.feature-name {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.feature-desc {
    font-size: 1rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
}

.feature-details {
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease-out;
    text-align: left;
}

.feature-card:hover .feature-details {
    opacity: 1;
    max-height: 200px;
    margin-top: 1rem;
}

.feature-details p {
    font-size: 0.9rem;
    color: var(--secondary-color);
    margin-bottom: 1rem;
    line-height: 1.6;
}

.feature-details ul {
    list-style: none;
    font-size: 0.85rem;
    color: var(--secondary-color);
}

.feature-details li {
    padding: 0.2rem 0;
    position: relative;
    padding-left: 1rem;
}

.feature-details li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

/* 支持格式区域 */
.formats-section {
    padding: 4rem 0;
    background: var(--surface-color);
}

.formats-grid {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.format-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 1.5rem;
    background: var(--background-color);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    min-width: 120px;
}

.format-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.format-item i {
    font-size: 2.5rem;
    color: var(--accent-color);
}

.format-item span {
    font-weight: 500;
    color: var(--primary-color);
}

.format-note {
    text-align: center;
    margin-top: 2rem;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.format-note i {
    color: var(--accent-color);
}

/* 下载区域 */
.download-section {
    padding: 5rem 0;
    background: var(--background-color);
}



/* 下载提示 */
.download-notice {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(37, 99, 235, 0.1) 100%);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--border-radius);
    padding: 1rem 1.5rem;
    margin: 2rem 0;
    text-align: center;
    color: var(--primary-color);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.download-notice i {
    color: var(--accent-color);
    font-size: 1.1rem;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.download-card {
    background: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-large);
    border-color: var(--accent-color);
}

.download-icon {
    font-size: 3rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.download-card h3 {
    font-size: 1.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.download-card p {
    color: var(--secondary-color);
    margin-bottom: 2rem;
}

.download-btn {
    background: var(--gradient-primary);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    font-family: inherit;
}

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

.download-btn.disabled {
    background: var(--secondary-color);
    cursor: not-allowed;
    opacity: 0.6;
}

.download-btn.disabled:hover {
    transform: none;
    box-shadow: none;
}

.download-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--secondary-color);
    margin-top: 1rem;
}

.github-link {
    text-align: center;
    margin-top: 3rem;
}

.github-link a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--secondary-color);
    text-decoration: none;
    font-size: 1rem;
    transition: var(--transition);
}

.github-link a:hover {
    color: var(--accent-color);
}

/* 关于区域 */
.about-section {
    padding: 5rem 0;
    background: var(--surface-color);
}

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 4rem;
    margin-top: 3rem;
    align-items: start;
}

.about-text p {
    font-size: 1.1rem;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    color: var(--secondary-color);
}

.about-features {
    margin-top: 2rem;
}

.about-feature {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.about-feature i {
    font-size: 1.5rem;
    color: var(--accent-color);
    margin-top: 0.2rem;
}

.about-feature h4 {
    font-size: 1.1rem;
    color: var(--primary-color);
    margin-bottom: 0.3rem;
}

.about-feature p {
    font-size: 0.95rem;
    color: var(--secondary-color);
    margin: 0;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    background: var(--background-color);
    padding: 2rem;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-medium);
}

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

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-color);
    display: block;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--secondary-color);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* 页脚 */
.footer {
    background: var(--primary-color);
    color: white;
    padding: 3rem 0 1rem;
}

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

.footer-content {
    display: grid;
    grid-template-columns: 1fr 3fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand h3 {
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    font-weight: 400;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.footer-section h4 {
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section a:hover {
    color: white;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.2rem;
    transition: var(--transition);
}

.footer-social a:hover {
    color: white;
}

/* 返回顶部按钮 */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition);
    opacity: 0;
    visibility: hidden;
    z-index: 1000;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-large);
}

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

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: 2rem;
        gap: 2rem;
        transition: var(--transition);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: rotate(-45deg) translate(-5px, 6px);
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: rotate(45deg) translate(-5px, -6px);
    }

    .header {
        padding: 2rem 1rem;
        min-height: 80vh;
    }

    .logo-text {
        font-size: 2.5rem;
    }

    .main-title {
        font-size: 1.8rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .cta-section {
        flex-direction: column;
        gap: 1rem;
    }

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

    .download-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }



    .download-notice {
        margin: 1.5rem 1rem;
        padding: 0.8rem 1rem;
        font-size: 0.9rem;
        flex-direction: column;
        gap: 0.3rem;
        text-align: center;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

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

    .about-stats {
        flex-direction: row;
        justify-content: space-around;
        gap: 1rem;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0.75rem 1rem;
    }

    .section-container {
        padding: 0 1rem;
    }

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

    .formats-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .about-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .stat-number {
        font-size: 2.5rem;
    }



    .download-notice {
        font-size: 0.85rem;
        padding: 0.7rem 0.8rem;
    }
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--surface-color);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--accent-hover);
}

/* 选择文本样式 */
::selection {
    background: rgba(59, 130, 246, 0.2);
    color: var(--primary-color);
}

/* 焦点样式 */
button:focus,
a:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* 加载动画 */
.loading {
    opacity: 0.6;
    pointer-events: none;
}

/* 工具提示 */
.tooltip {
    position: relative;
}

.tooltip::before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    font-size: 0.875rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
}

.tooltip:hover::before {
    opacity: 1;
    visibility: visible;
}