/* ==========================================================
   扩展模块样式 - FAQ、客户案例、统计、合作伙伴、博客
   ProtonVPN Edition I (深空紫主题)
   ========================================================== */

/* ========== FAQ 折叠 ========== */
.faq-section {
    padding: 80px 20px;
}

.faq-list {
    max-width: 850px;
    margin: 0 auto;
}

.faq-item {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(109, 74, 255, 0.2);
    border-radius: 12px;
    margin-bottom: 15px;
    overflow: hidden;
    transition: all 0.3s;
}

.faq-item:hover {
    border-color: var(--primary);
}

.faq-question {
    padding: 22px 30px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--light);
    transition: color 0.3s;
    user-select: none;
}

.faq-question:hover {
    color: var(--secondary);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--secondary);
    transition: transform 0.3s;
    flex-shrink: 0;
    margin-left: 20px;
    font-weight: 300;
}

.faq-item.open .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
    color: var(--gray);
    line-height: 1.8;
}

.faq-item.open .faq-answer {
    max-height: 500px;
    padding: 0 30px 25px;
}

/* ========== 客户案例 ========== */
.cases-section {
    padding: 80px 20px;
    background: rgba(255, 255, 255, 0.02);
}

.cases-subtitle {
    text-align: center;
    color: var(--gray);
    margin-bottom: 50px;
    font-size: 1.1rem;
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 25px;
}

.case-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(109, 74, 255, 0.2);
    border-radius: 16px;
    padding: 30px;
    transition: all 0.3s;
    position: relative;
}

.case-card::before {
    content: '"';
    position: absolute;
    top: 10px;
    left: 20px;
    font-size: 4rem;
    color: var(--primary);
    opacity: 0.3;
    font-family: Georgia, serif;
    line-height: 1;
}

.case-card:hover {
    border-color: var(--primary);
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(109, 74, 255, 0.2);
}

.case-quote {
    color: var(--light);
    line-height: 1.7;
    margin-bottom: 25px;
    margin-top: 30px;
    font-style: italic;
}

.case-author {
    display: flex;
    align-items: center;
    gap: 15px;
    padding-top: 20px;
    border-top: 1px solid rgba(109, 74, 255, 0.2);
}

.case-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--light);
    flex-shrink: 0;
}

.case-info h4 {
    font-size: 1rem;
    margin-bottom: 3px;
}

.case-info p {
    color: var(--gray);
    font-size: 0.85rem;
}

.case-rating {
    margin-top: 8px;
    color: #ffbe0b;
    font-size: 0.9rem;
    letter-spacing: 2px;
}

/* ========== 统计数字区 ========== */
.stats-section {
    padding: 80px 20px;
    background: radial-gradient(ellipse at center, rgba(109, 74, 255, 0.1), transparent 60%);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    text-align: center;
}

.stat-box {
    padding: 30px 20px;
}

.stat-number {
    font-size: 3.5rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 10px;
    line-height: 1;
}

.stat-number .unit {
    font-size: 1.5rem;
    -webkit-text-fill-color: var(--secondary);
}

.stat-label {
    color: var(--gray);
    font-size: 1rem;
}

/* ========== 合作伙伴 ========== */
.partners-section {
    padding: 60px 20px;
    text-align: center;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 25px;
    max-width: 900px;
    margin: 0 auto;
    align-items: center;
}

.partner-logo {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(109, 74, 255, 0.15);
    border-radius: 12px;
    padding: 25px 15px;
    color: var(--gray);
    font-weight: 600;
    font-size: 1.05rem;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80px;
    letter-spacing: 1px;
}

.partner-logo:hover {
    border-color: var(--primary);
    color: var(--light);
    transform: translateY(-3px);
    background: rgba(109, 74, 255, 0.1);
}

/* ========== 博客预览 ========== */
.blog-section {
    padding: 80px 20px;
    background: rgba(255, 255, 255, 0.02);
}

.blog-subtitle {
    text-align: center;
    color: var(--gray);
    margin-bottom: 50px;
    font-size: 1.1rem;
}

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
}

.blog-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(109, 74, 255, 0.2);
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s;
}

.blog-card:hover {
    border-color: var(--primary);
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(109, 74, 255, 0.2);
}

.blog-image {
    height: 180px;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 4rem;
    position: relative;
}

.blog-tag {
    position: absolute;
    top: 15px;
    left: 15px;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(10px);
    color: var(--light);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
}

.blog-content {
    padding: 25px;
}

.blog-meta {
    color: var(--gray);
    font-size: 0.85rem;
    margin-bottom: 10px;
}

.blog-title {
    font-size: 1.2rem;
    margin-bottom: 12px;
    line-height: 1.4;
}

.blog-excerpt {
    color: var(--gray);
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 15px;
}

.blog-link {
    color: var(--secondary);
    font-weight: 600;
    font-size: 0.95rem;
    transition: gap 0.3s;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.blog-link:hover {
    gap: 10px;
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    .faq-question { padding: 18px 20px; font-size: 1rem; }
    .faq-item.open .faq-answer { padding: 0 20px 20px; }
    .stat-number { font-size: 2.5rem; }
    .cases-grid { grid-template-columns: 1fr; }
    .blog-grid { grid-template-columns: 1fr; }
    .partners-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 480px) {
    .partners-grid { grid-template-columns: repeat(2, 1fr); }
    .stat-number { font-size: 2rem; }
}