/* 功能卡片网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    padding: 2.5rem 2rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--white);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary-color), var(--accent-color));
    transition: width 0.3s ease;
}

.feature-card:hover::before {
    width: 6px;
}

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

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    display: block;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* 使用场景网格 */
.use-case-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.use-case-card {
    padding: 2rem;
    border-radius: var(--border-radius);
    background: var(--white);
    border-left: 4px solid var(--secondary-color);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.use-case-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

/* 价格方案 */
.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.pricing-card {
    padding: 2.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--white);
    text-align: center;
    transition: var(--transition);
    position: relative;
}

.pricing-card.featured {
    border-color: var(--primary-color);
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.pricing-features {
    list-style: none;
    padding: 0;
    text-align: left;
    margin: 2rem 0;
}

.pricing-features li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
    position: relative;
    padding-left: 25px;
}

.pricing-features li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.price {
    font-size: 2.5rem;
    color: var(--primary-color);
    font-weight: 700;
    margin: 1.5rem 0;
}

.price-period {
    font-size: 0.9rem;
    color: var(--text-light);
}

/* FAQ网格 */
.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.faq-item {
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background: var(--white);
    transition: var(--transition);
}

.faq-item:hover {
    box-shadow: var(--shadow);
}

.faq-question {
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.1rem;
}

/* 版本对比 */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.comparison-card {
    padding: 2.5rem;
    border-radius: var(--border-radius);
    background: var(--white);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.comparison-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.comparison-header {
    text-align: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.comparison-features {
    list-style: none;
    padding: 0;
}

.comparison-features li {
    padding: 12px 0;
    border-bottom: 1px solid var(--light-bg);
    position: relative;
    padding-left: 30px;
    font-size: 0.9rem;
}

.comparison-features li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--secondary-color);
    font-weight: bold;
}

.comparison-features li.crossed {
    color: var(--text-light);
    text-decoration: line-through;
}

.comparison-features li.crossed:before {
    content: "✗";
    color: var(--text-light);
}

/* 下载区域 */
.download-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    text-align: center;
    padding: 4rem 0;
}

.download-section h2 {
    color: var(--white);
}

.download-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin: 2rem 0;
    flex-wrap: wrap;
}

/* 演示区域 */
.demo-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--white);
    text-align: center;
    padding: 4rem 0;
}

.demo-section h2 {
    color: var(--white);
}

.demo-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin: 2rem 0;
    flex-wrap: wrap;
}

/* 安全提示 */
.security-notice {
    background: #e8f5e8;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin: 2rem 0;
    text-align: left;
    border-left: 4px solid var(--secondary-color);
}

.security-notice h4 {
    margin-top: 0;
    color: var(--secondary-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.security-notice ul {
    margin: 1rem 0 0 0;
    padding-left: 1.5rem;
}

.security-notice li {
    margin-bottom: 0.5rem;
}

/* 下载链接网格 */
.download-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2.5rem 0;
}

.download-link {
    display: flex;
    align-items: center;
    padding: 1.5rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    text-decoration: none;
    color: var(--text-color);
    transition: var(--transition);
    background: var(--white);
}

.download-link:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.download-icon {
    font-size: 2.5rem;
    margin-right: 1.5rem;
    flex-shrink: 0;
}

.download-info h3 {
    margin: 0 0 0.5rem 0;
    color: var(--primary-color);
    font-size: 1.2rem;
}

.download-info p {
    margin: 0;
    color: var(--text-light);
    font-size: 0.9rem;
    line-height: 1.4;
}

/* 模式指示器 */
.mode-indicator {
    display: inline-block;
    padding: 10px 25px;
    border-radius: 25px;
    font-weight: 600;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.mode-download {
    background: linear-gradient(135deg, var(--secondary-color), #00c271);
    color: var(--white);
}

.mode-preorder {
    background: linear-gradient(135deg, var(--accent-color), #7c3aed);
    color: var(--white);
}

/* 表单样式 */
.preorder-form {
    background: var(--light-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    margin: 2rem 0;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.95rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    transition: var(--transition);
    font-family: inherit;
    background: var(--white);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
}

/* 帮助信息 */
.help-section {
    background: var(--light-bg);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-top: 2rem;
    text-align: center;
}

.help-section h4 {
    margin-top: 0;
    color: var(--primary-color);
}

.help-section a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.help-section a:hover {
    text-decoration: underline;
}

/* 联系信息 */
.contact-info {
    background: #e8f4f8;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin-top: 2rem;
    text-align: center;
}

.contact-info h4 {
    margin-top: 0;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

/* 导航链接 */
.nav-links-bottom {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.nav-links-bottom a {
    color: var(--primary-color);
    text-decoration: none;
    margin: 0 1rem;
    font-weight: 500;
}

.nav-links-bottom a:hover {
    text-decoration: underline;
}

/* 加载动画 */
.loading {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.loaded {
    opacity: 1;
    transform: translateY(0);
}