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

:root {
    --primary-color: #1a5f5f;
    --accent-color: #ff9800;
    --light-bg: #f5f5f5;
    --white: #ffffff;
    --text-dark: #333333;
    --text-light: #666666;
    --border-color: #e0e0e0;
    --tag-beginner: #4caf50;
    --tag-intermediate: #2196f3;
    --tag-advanced: #9c27b0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--light-bg);
}

/* 導航菜單 */
.navbar {
    background-color: var(--primary-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo {
    font-size: 1.3rem;
    font-weight: bold;
    color: var(--white);
    white-space: nowrap;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.8rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.nav-menu a {
    color: var(--white);
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.85rem;
    padding: 0.5rem 0.8rem;
    white-space: nowrap;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: var(--accent-color);
}

/* 英雄區域 */
.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, #2a7f7f 100%);
    color: var(--white);
    padding: 6rem 2rem;
    text-align: center;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero-content p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.cta-button {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--white);
    padding: 1rem 2.5rem;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s ease, transform 0.2s ease;
    font-size: 1.1rem;
}

.cta-button:hover {
    background-color: #ff8c00;
    transform: translateY(-2px);
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* 推薦課程 */
.featured-courses {
    padding: 4rem 0;
    background-color: var(--white);
}

.featured-courses h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.course-card {
    background-color: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
}

.course-tag {
    display: inline-block;
    background-color: var(--tag-beginner);
    color: var(--white);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-bottom: 1rem;
    font-weight: 600;
}

.course-card h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
    line-height: 1.4;
}

.course-card p {
    color: var(--text-light);
    margin-bottom: 1rem;
    font-size: 0.95rem;
    line-height: 1.5;
}

.course-info {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.course-info span {
    font-size: 0.9rem;
    color: var(--text-light);
}

.course-info .price {
    color: var(--accent-color);
    font-weight: 600;
}

.course-info .teacher {
    color: var(--primary-color);
    font-weight: 500;
}

.learn-more {
    display: inline-block;
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.learn-more:hover {
    color: #ff8c00;
}

/* 課程分類 */
.course-categories {
    padding: 4rem 0;
    background-color: var(--light-bg);
}

.course-categories h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

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

.category-card {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    text-align: center;
    border-left: 4px solid var(--accent-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.category-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 3px 15px rgba(0,0,0,0.1);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.category-card h3 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.category-card p {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* 關於老師 */
.about-teacher {
    padding: 4rem 0;
    background-color: var(--white);
}

.about-teacher h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.teacher-content {
    background-color: #f9f9f9;
    padding: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.teacher-text p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--text-dark);
}

/* 頁腳 */
.footer {
    background-color: var(--primary-color);
    color: var(--white);
    text-align: center;
    padding: 2rem;
    margin-top: 4rem;
}

.footer a {
    color: var(--accent-color);
    text-decoration: none;
}

.footer a:hover {
    text-decoration: underline;
}

/* 課程詳情頁面 */
.course-detail {
    padding: 3rem 0;
}

.course-detail-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #2a7f7f 100%);
    color: var(--white);
    padding: 3rem 0;
    margin-bottom: 2rem;
}

.course-detail-header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.course-detail-header .meta {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    font-size: 1.1rem;
}

.course-detail-content {
    background-color: var(--white);
    padding: 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.course-detail-content h2 {
    color: var(--primary-color);
    margin-top: 2rem;
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.course-detail-content h3 {
    color: var(--accent-color);
    margin-top: 1.5rem;
    margin-bottom: 0.8rem;
    font-size: 1.2rem;
}

.course-detail-content p {
    margin-bottom: 1rem;
    line-height: 1.8;
    color: var(--text-dark);
}

.course-detail-content ul,
.course-detail-content ol {
    margin-left: 2rem;
    margin-bottom: 1rem;
}

.course-detail-content li {
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.course-info-box {
    background-color: #f9f9f9;
    padding: 1.5rem;
    border-left: 4px solid var(--accent-color);
    margin: 1.5rem 0;
    border-radius: 4px;
}

.course-info-box strong {
    color: var(--primary-color);
}

.registration-section {
    background-color: var(--light-bg);
    padding: 2rem;
    border-radius: 8px;
    margin-top: 2rem;
}

.registration-section h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.registration-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.registration-method {
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.registration-method h3 {
    color: var(--accent-color);
    margin-bottom: 0.8rem;
}

.registration-method p {
    color: var(--text-dark);
    margin-bottom: 0.5rem;
}

.registration-method a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
}

.registration-method a:hover {
    color: var(--accent-color);
}

.back-link {
    display: inline-block;
    margin-bottom: 2rem;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.back-link:hover {
    color: var(--accent-color);
}

/* 響應式設計 */
@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .hero-content h1 {
        font-size: 2rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .featured-courses h2,
    .course-categories h2,
    .about-teacher h2 {
        font-size: 1.8rem;
    }

    .course-detail-header h1 {
        font-size: 1.8rem;
    }

    .course-detail-header .meta {
        flex-direction: column;
        gap: 0.5rem;
    }

    .courses-grid,
    .categories-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
    }

    .hero {
        padding: 3rem 1rem;
    }

    .hero-content h1 {
        font-size: 1.5rem;
    }

    .cta-button {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
}