/* ========================================
   HK365 教程网 - 简约风格
   ======================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

:root {
    --primary: #0066cc;
    --primary-dark: #0052a3;
    --primary-light: #e6f0ff;
    --accent: #ff6b35;
    --white: #fff;
    --bg: #f8f9fa;
    --border: #e5e7eb;
    --text: #1f2937;
    --text-secondary: #6b7280;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Microsoft YaHei', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100vh;
}

a {
    color: inherit;
    text-decoration: none;
}

/* 顶部导航 */
.navbar {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 100%;
    margin: 0 auto;
    padding: 0 16px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-title {
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
    margin: 0 auto;
}

.nav-action {
    display: none;
}

.nav-back {
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--text);
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
}

/* Hero区域 */
.hero {
    background: var(--white);
    padding: 32px 20px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}

.hero-title {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text);
}

.hero-desc {
    font-size: 14px;
    color: var(--text-secondary);
}

/* 主容器 */
.main-container {
    max-width: 100%;
    margin: 0 auto;
    padding: 16px 16px 40px;
}

/* 分类卡片 */
.category-grid {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.category-card {
    background: var(--white);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 14px;
    border-radius: 12px;
    border: 1px solid var(--border);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.category-card:active {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-light);
}

.category-icon {
    width: 44px;
    height: 44px;
    background: var(--primary-light);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--primary);
}

.category-text {
    flex: 1;
}

.category-title {
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 2px;
    color: var(--text);
}

.category-meta {
    font-size: 13px;
    color: var(--text-secondary);
}

.category-arrow {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 300;
}

/* 客服入口 */
.service-section {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--border);
}

.service-section-title {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

.service-card {
    background: var(--white);
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    gap: 14px;
}

.service-card-icon {
    width: 44px;
    height: 44px;
    background: var(--primary);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    color: var(--white);
}

.service-card-text {
    flex: 1;
}

.service-card-title {
    font-size: 15px;
    font-weight: 500;
    margin-bottom: 2px;
}

.service-card-desc {
    font-size: 13px;
    color: var(--text-secondary);
}

.service-card-arrow {
    color: var(--text-secondary);
    font-size: 14px;
}

/* 教程列表 */
.tutorial-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.tutorial-card {
    background: var(--white);
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
    transition: border-color 0.2s;
}

.tutorial-card:active {
    border-color: var(--primary);
}

.tutorial-header {
    padding: 14px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    border-bottom: 1px solid var(--border);
}

.tutorial-number {
    width: 28px;
    height: 28px;
    background: var(--primary);
    color: var(--white);
    font-size: 13px;
    font-weight: 500;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border-radius: 6px;
}

.tutorial-info {
    flex: 1;
}

.tutorial-title {
    font-size: 15px;
    font-weight: 500;
}

.tutorial-badge {
    font-size: 12px;
    color: var(--text-secondary);
}

.tutorial-body {
    padding: 14px 16px;
}

.tutorial-desc {
    font-size: 13px;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.6;
}

.btn-tutorial {
    display: block;
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: var(--white);
    text-align: center;
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--primary);
    color: var(--primary);
}

/* 信息卡片 */
.info-card {
    background: var(--white);
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--border);
}

.info-card h3 {
    font-size: 15px;
    margin-bottom: 8px;
}

.info-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* 联系卡片 */
.contact-card {
    background: var(--white);
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
}

.contact-header {
    background: var(--primary);
    color: var(--white);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.contact-header h3 {
    font-size: 16px;
    font-weight: 500;
}

.contact-desc {
    padding: 16px;
}

.contact-desc p {
    font-size: 14px;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

.work-time {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    color: var(--primary);
    background: var(--primary-light);
    padding: 6px 12px;
    border-radius: 6px;
}

.contact-methods {
    padding: 0 16px 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.contact-method {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px;
    background: var(--bg);
    border-radius: 10px;
}

.contact-method.wechat {
    background: var(--primary-light);
    border: 1px solid rgba(0, 102, 204, 0.2);
}

.method-icon {
    width: 40px;
    height: 40px;
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    border-radius: 8px;
}

.contact-method.phone .method-icon {
    background: var(--accent);
}

.method-info {
    flex: 1;
}

.method-title {
    font-size: 14px;
    font-weight: 500;
}

.method-subtitle {
    font-size: 12px;
    color: var(--text-secondary);
}

.method-phone {
    font-size: 16px;
    font-weight: 600;
    color: var(--accent);
}

.method-arrow {
    color: var(--text-secondary);
}

.contact-footer {
    padding: 14px 16px;
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
    border-top: 1px solid var(--border);
}

/* 响应式 - 平板及以上 */
@media (min-width: 768px) {
    .nav-container {
        max-width: 600px;
    }

    .hero {
        padding: 40px 20px;
    }

    .hero-title {
        font-size: 26px;
    }

    .main-container {
        max-width: 600px;
        padding: 24px 20px 60px;
    }

    .category-grid {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .tutorial-list {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }
}

/* 响应式 - 桌面 */
@media (min-width: 1024px) {
    .nav-container {
        max-width: 800px;
    }

    .main-container {
        max-width: 800px;
    }

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