:root {
    --primary-blue: #638cfb;
    --primary-blue-hover: #4e76e6;
    --primary-green: #11cda9;
    --primary-green-hover: #0fb393;
    --bg-color: #f2f6fc;
    --card-bg: #ffffff;
    --text-main: #333333;
    --text-secondary: #8c8c8c;
    --alert-bg: #f8f9fe;
    --alert-text: #666666;
    --warning-bg: #fff8e6;
    --warning-text: #d48c28;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'PingFang SC', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 40px 20px;
}

.container {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.card {
    background-color: var(--card-bg);
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    padding: 40px;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 500px;
    margin: 0 auto;
    width: 100%;
}

.logo-container {
    font-size: 48px;
    color: #11cda9;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #00c6ff, #0072ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-title {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 8px;
}

.brand-subtitle {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 30px;
}

.alert-box {
    background-color: var(--alert-bg);
    border-radius: 12px;
    padding: 15px 20px;
    width: 100%;
    margin-bottom: 30px;
    border: 1px solid #edf0f9;
}

.alert-title {
    font-size: 13px;
    font-weight: 600;
    color: #e54d42;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.alert-content {
    font-size: 13px;
    color: var(--alert-text);
    line-height: 1.5;
}

.divider-text {
    font-size: 12px;
    color: var(--text-secondary);
    margin-bottom: 20px;
    position: relative;
    width: 100%;
    text-align: center;
}

.divider-text::before,
.divider-text::after {
    content: '';
    position: absolute;
    top: 50%;
    width: 30%;
    height: 1px;
    background-color: #eee;
}

.divider-text::before {
    left: 0;
}

.divider-text::after {
    right: 0;
}

.button-group {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 25px;
}

.btn {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    border-radius: 12px;
    text-decoration: none;
    color: white;
    transition: all 0.3s ease;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.btn-primary {
    background: linear-gradient(135deg, #7aa4ff, #5780f9);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #6892ee, #4e76e6);
}

.btn-secondary {
    background: linear-gradient(135deg, #24dcb9, #08c19d);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, #1ccba8, #07ad8c);
}

.btn-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    margin-right: 15px;
}

.cn-icon {
    font-weight: bold;
    font-size: 18px;
    background: rgba(255,255,255,0.2);
    padding: 4px 8px;
    border-radius: 6px;
}

.btn-text {
    display: flex;
    flex-direction: column;
}

.btn-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 2px;
}

.btn-desc {
    font-size: 12px;
    opacity: 0.9;
}

.bookmark-hint {
    background-color: var(--warning-bg);
    color: var(--warning-text);
    padding: 8px 20px;
    border-radius: 20px;
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 500;
}

/* Content Sections */
.content-section {
    background: #fff;
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.03);
}

.content-section h2 {
    font-size: 22px;
    margin-bottom: 30px;
    text-align: center;
    color: #2c3e50;
    position: relative;
    padding-bottom: 15px;
}

.content-section h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: var(--primary-blue);
    border-radius: 2px;
}

/* Articles Grid */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.article-card {
    border: 1px solid #eee;
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s;
    text-decoration: none;
    color: inherit;
    display: block;
}

.article-card:hover {
    box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    border-color: #d1dffd;
    transform: translateY(-3px);
}

.article-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 10px;
    color: #2c3e50;
}

.article-summary {
    font-size: 13px;
    color: #666;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* Reviews */
.reviews-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}

.review-card {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 12px;
}

.review-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.review-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-blue);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 18px;
    margin-right: 12px;
}

.review-info {
    display: flex;
    flex-direction: column;
}

.review-name {
    font-weight: 600;
    font-size: 14px;
}

.review-stars {
    color: #ffc107;
    font-size: 12px;
}

.review-text {
    font-size: 13px;
    color: #555;
    line-height: 1.6;
}

/* FAQ */
.faq-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.faq-item {
    border: 1px solid #eee;
    border-radius: 12px;
    padding: 20px;
}

.faq-question {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 10px;
    color: #2c3e50;
}

.faq-answer {
    font-size: 14px;
    color: #666;
    line-height: 1.6;
}

footer {
    text-align: center;
    color: #999;
    font-size: 12px;
    margin-top: 20px;
}

/* Responsive */
@media (max-width: 600px) {
    .card, .content-section {
        padding: 30px 20px;
    }
    .reviews-container {
        grid-template-columns: 1fr;
    }
}