/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    overflow-x: hidden;
}

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

/* 头部导航 */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 20px;
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
    padding-left: 20px;
    background: linear-gradient(45deg, #fff, #f0f0f0);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    list-style: none;
    padding-right: 20px;
}

.nav-links li {
    margin-left: 1.5rem;
}

.nav-links a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
    padding: 5px 0;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: white;
    transition: width 0.3s ease;
}

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

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -10%;
    width: 50%;
    height: 200%;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    z-index: 0;
}

.hero .container {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
    justify-content: center;
    width: 100%;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 700px;
    margin-bottom: 2rem;
    text-align: left;
    width: 100%;
}

.hero h2 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
    line-height: 1.1;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    letter-spacing: -0.5px;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    line-height: 1.6;
    font-weight: 400;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: flex-start;
    flex-wrap: wrap;
}

.btn {
    padding: 12px 24px;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn.primary {
    background: white;
    color: #667eea;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
}

.btn.secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

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

/* 功能部分 */
.features {
    padding: 100px 0;
    background: white;
    position: relative;
}

.features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: linear-gradient(180deg, #f5f5f5, white);
    z-index: 1;
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 4rem;
    color: #333;
    position: relative;
    z-index: 2;
}

.features h2::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    margin: 1rem auto 0;
    border-radius: 2px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
    position: relative;
    z-index: 2;
}

.feature-card {
    background: #f9f9f9;
    padding: 2.5rem;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s ease;
    border: 1px solid #e0e0e0;
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transform: scaleX(0);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.08);
}

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

.feature-icon {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 2rem;
    color: white;
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.2);
    transition: all 0.3s ease;
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
    box-shadow: 0 15px 25px rgba(102, 126, 234, 0.3);
}

.feature-card h3 {
    font-size: 1.4rem;
    margin-bottom: 1.5rem;
    color: #333;
    font-weight: 600;
}

.feature-card p {
    color: #666;
    line-height: 1.6;
}

/* 下载部分 */
.download {
    padding: 100px 0;
    background: #f5f5f5;
    text-align: center;
}

.download h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.download p {
    font-size: 1.1rem;
    margin-bottom: 3rem;
    color: #666;
}

.download-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 15px 30px;
    background: white;
    color: #333;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid #e0e0e0;
}

.download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.2);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

/* 关于部分 */
.about {
    padding: 100px 0;
    background: white;
}

.about h2 {
    text-align: left;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #333;
    position: relative;
}

.about h2::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    margin: 1rem 0 0;
    border-radius: 2px;
}

.about-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 2rem;
    width: 100%;
}

.about-text {
    max-width: 800px;
    text-align: left;
    width: 100%;
    padding: 0 20px;
}

.about-text p {
    margin-bottom: 1.5rem;
    color: #666;
    line-height: 1.7;
    font-size: 1.1rem;
}

/* 页脚 */
footer {
    background: #333;
    color: white;
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-info h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    background: linear-gradient(45deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.footer-info p {
    opacity: 0.8;
    line-height: 1.6;
}

.footer-links h4,
.footer-contact h4 {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    color: #f0f0f0;
}

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

.footer-links li {
    margin-bottom: 0.8rem;
}

.footer-links a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
    display: inline-block;
    position: relative;
    padding-left: 15px;
}

.footer-links a::before {
    content: '→';
    position: absolute;
    left: 0;
    transition: transform 0.3s ease;
}

.footer-links a:hover {
    opacity: 1;
}

.footer-links a:hover::before {
    transform: translateX(5px);
}

.footer-contact p {
    opacity: 0.8;
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-bottom {
    border-top: 1px solid #444;
    padding-top: 20px;
    text-align: center;
    opacity: 0.7;
}

/* 下载弹窗 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background-color: white;
    border-radius: 15px;
    padding: 30px;
    width: 90%;
    max-width: 450px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    animation: slideIn 0.3s ease;
    position: relative;
    overflow: hidden;
}

.modal-content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.modal-header h3 {
    font-size: 1.5rem;
    color: #333;
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    font-size: 1.8rem;
    cursor: pointer;
    color: #999;
    transition: color 0.3s ease;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    color: #333;
}

.modal-body {
    margin-bottom: 30px;
    text-align: center;
}

.modal-body p {
    color: #666;
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.extract-code {
    background: linear-gradient(135deg, #f5f5f5, #e0e0e0);
    padding: 15px;
    border-radius: 8px;
    font-size: 1.5rem;
    font-weight: 700;
    color: #667eea;
    margin: 20px 0;
    letter-spacing: 2px;
    font-family: 'Courier New', monospace;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.1);
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
}

.extract-code:hover {
    background: linear-gradient(135deg, #e8e8e8, #d0d0d0);
    color: #5a6fd6;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    transform: translateY(-1px);
}

.modal-note {
    font-size: 0.9rem;
    color: #999;
    margin-top: 15px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
}

.modal-footer .btn.secondary {
    background: transparent;
    color: #666;
    border: 2px solid #ddd;
}

.modal-footer .btn.secondary:hover {
    background: #f5f5f5;
    color: #333;
    border-color: #ccc;
}

.modal-footer .btn.primary {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
}

.modal-footer .btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

/* 动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero h2 {
        font-size: 2.2rem;
    }

    .hero p {
        font-size: 1.1rem;
    }

    .features h2,
    .download h2,
    .about h2 {
        font-size: 2rem;
        text-align: center;
    }

    .about h2::after {
        margin: 1rem auto 0;
    }

    .about-content {
        align-items: center;
    }

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

    .download-links {
        flex-direction: column;
        align-items: center;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-links a {
        padding-left: 0;
    }

    .footer-links a::before {
        display: none;
    }
}

@media (min-width: 769px) {
    .hero .container {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        text-align: left;
    }

    .hero-content {
        flex: 1;
        margin-right: 2rem;
        margin-bottom: 0;
    }

    .hero-image {
        flex: 1;
        margin-top: 0;
    }

    .about-content {
        flex-direction: row;
        align-items: center;
        text-align: left;
    }

    .about-text {
        flex: 1;
        margin-right: 2rem;
    }

    .about-image {
        flex: 1;
    }
}

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

.feature-card,
.hero-content,
.download-links {
    animation: fadeInUp 0.6s ease-out;
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 加载动画 */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid #f3f3f3;
    border-top: 2px solid #667eea;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 自定义滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #667eea;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #764ba2;
}

/* 复制成功提示 */
.copy-toast {
    position: fixed;
    top: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(-20px);
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 15px 30px;
    border-radius: 50px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
    z-index: 3000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.copy-toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}