/* CSS 變數定義 - 科技風主題 */
:root {
    /* 主題色 - 淡藍色科技系 */
    --bg-primary: #0f1629;
    --bg-secondary: #1a2341;
    --bg-tertiary: #243352;
    
    /* 文字色 */
    --text-primary: #f0f8ff;
    --text-secondary: #b8d4e8;
    --text-tertiary: #87ceeb;
    
    /* 邊框色 */
    --border-color: #2a3f5f;
    
    /* 強調色 - 淡藍色系 */
    --accent-blue: #87ceeb;
    --accent-green: #90ee90;
    --accent-red: #ffb6c1;
    --accent-purple: #9370db;
    
    /* 圓角 */
    --radius-card: 16px;
    --radius-button: 12px;
    
    /* 間距 */
    --spacing-section: 2rem;
    --spacing-element: 1rem;
}

/* 全局樣式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: "LXGW WenKai TC", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(173, 216, 230, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(135, 206, 250, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(176, 224, 230, 0.08) 0%, transparent 50%);
}

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

/* 導航欄 */
.navbar {
    background-color: rgba(26, 31, 58, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--accent-blue);
}

/* 主視覺區 */
.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-tertiary) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        linear-gradient(45deg, transparent 30%, rgba(135, 206, 235, 0.05) 50%, transparent 70%),
        linear-gradient(-45deg, transparent 30%, rgba(147, 112, 219, 0.04) 50%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 30px rgba(135, 206, 235, 0.4);
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.hero-badges {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: rgba(37, 43, 71, 0.8);
    border: 1px solid rgba(135, 206, 235, 0.3);
    border-radius: var(--radius-button);
    font-size: 0.875rem;
    color: var(--text-secondary);
    backdrop-filter: blur(10px);
    text-decoration: none;
    transition: all 0.3s;
}

.badge:hover {
    border-color: rgba(135, 206, 235, 0.6);
    color: var(--accent-blue);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(135, 206, 235, 0.2);
}

/* 按鈕樣式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-button);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    color: var(--bg-primary);
    border: 1px solid rgba(135, 206, 235, 0.4);
    box-shadow: 0 4px 20px rgba(135, 206, 235, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(135, 206, 235, 0.5);
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-blue));
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* 程式碼預覽 */
.code-preview {
    background-color: #0d1117;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-card);
    padding: 1.5rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.window-header {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red {
    background-color: #ff5f56;
}

.dot.yellow {
    background-color: #ffbd2e;
}

.dot.green {
    background-color: #27ca40;
}

.code-preview pre {
    margin: 0;
}

.code-preview code {
    color: var(--accent-blue);
    font-family: "Fira Code", "Consolas", monospace;
    font-size: 0.875rem;
    line-height: 1.8;
    text-shadow: 0 0 8px rgba(135, 206, 235, 0.5);
}

/* 區塊樣式 */
.section {
    padding: 4rem 0;
}

.section-alt {
    background-color: var(--bg-secondary);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

/* 課程卡片 */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.course-card {
    background-color: rgba(37, 43, 71, 0.6);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: var(--radius-card);
    padding: 2rem;
    transition: all 0.3s;
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
}

.course-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-blue), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}

.course-card:hover::before {
    opacity: 1;
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 212, 255, 0.2);
    border-color: rgba(0, 212, 255, 0.4);
}

.card-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.1), rgba(139, 92, 255, 0.1));
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: var(--radius-card);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.1);
}

.card-icon svg {
    width: 30px;
    height: 30px;
    color: var(--accent-blue);
}

.course-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.course-card ul {
    list-style: none;
}

.course-card li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.course-card li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--accent-blue);
    font-weight: bold;
}

/* 講師介紹 */
.instructor-card {
    max-width: 700px;
    margin: 0 auto;
    background: linear-gradient(135deg, rgba(37, 43, 71, 0.6), rgba(26, 31, 58, 0.6));
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: var(--radius-card);
    padding: 2.5rem;
    display: flex;
    gap: 2rem;
    align-items: center;
    backdrop-filter: blur(10px);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.instructor-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-purple), transparent);
    opacity: 0.5;
}

.instructor-card:hover {
    border-color: rgba(0, 212, 255, 0.4);
    box-shadow: 0 12px 40px rgba(0, 212, 255, 0.15);
    transform: translateY(-4px);
}

.instructor-photo {
    flex-shrink: 0;
    width: 150px;
    height: 150px;
    border-radius: 50%;
    overflow: hidden;
    border: 3px solid rgba(0, 212, 255, 0.3);
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.2);
}

.instructor-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.instructor-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.instructor-title {
    font-size: 0.95rem;
    color: var(--accent-green);
    margin-bottom: 1rem;
    font-weight: 500;
}

.instructor-desc {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* 響應式講師卡片 */
@media (max-width: 600px) {
    .instructor-card {
        flex-direction: column;
        text-align: center;
        padding: 2rem;
    }

    .instructor-photo {
        width: 120px;
        height: 120px;
    }
}

/* 價格卡片 */
.price-card {
    max-width: 500px;
    margin: 0 auto;
    background: linear-gradient(135deg, rgba(37, 43, 71, 0.8), rgba(26, 31, 58, 0.8));
    border: 2px solid var(--accent-blue);
    border-radius: var(--radius-card);
    padding: 3rem;
    text-align: center;
    backdrop-filter: blur(20px);
    box-shadow: 0 8px 40px rgba(0, 212, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.price-card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(0, 212, 255, 0.1), transparent);
    animation: rotate 10s linear infinite;
}

@keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.price-header {
    margin-bottom: 2rem;
}

.price-label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.price-amount {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
    margin-bottom: 0.5rem;
}

.currency {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent-blue);
}

.price-note {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.price-features {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 2rem;
}

.feature {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    justify-content: center;
    color: var(--text-secondary);
}

.feature svg {
    width: 20px;
    height: 20px;
    color: var(--accent-green);
}

/* 表單樣式 */
.form-container {
    max-width: 600px;
    margin: 0 auto;
}

.registration-form {
    background-color: rgba(37, 43, 71, 0.6);
    border: 1px solid rgba(0, 212, 255, 0.2);
    border-radius: var(--radius-card);
    padding: 2rem;
    backdrop-filter: blur(10px);
}

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

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

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid rgba(0, 212, 255, 0.3);
    border-radius: var(--radius-button);
    font-size: 1rem;
    font-family: inherit;
    background-color: rgba(26, 31, 58, 0.8);
    color: var(--text-primary);
    transition: all 0.3s;
    backdrop-filter: blur(10px);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-blue);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.2);
    background-color: rgba(26, 31, 58, 0.9);
}

.form-group textarea {
    resize: vertical;
}

.form-submit {
    margin-top: 2rem;
}

/* 成功訊息 */
.success-message {
    background: linear-gradient(135deg, rgba(37, 43, 71, 0.8), rgba(26, 31, 58, 0.8));
    border: 1px solid var(--accent-green);
    border-radius: var(--radius-card);
    padding: 3rem;
    text-align: center;
    backdrop-filter: blur(20px);
    box-shadow: 0 8px 40px rgba(0, 255, 136, 0.2);
}

.success-message.hidden {
    display: none;
}

.success-icon {
    width: 80px;
    height: 80px;
    background-color: rgba(61, 122, 95, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.success-icon svg {
    width: 40px;
    height: 40px;
    color: var(--accent-green);
}

.success-message h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--accent-green);
}

.success-message p {
    color: var(--text-secondary);
}

/* 頁尾 */
.footer {
    background-color: rgba(26, 31, 58, 0.95);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
    margin-top: 4rem;
    backdrop-filter: blur(10px);
}

.footer-content {
    text-align: center;
}

.footer-brand {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.footer-text {
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

/* 響應式設計 */
@media (max-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-badges {
        justify-content: center;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .nav-links {
        display: none;
    }
    
    .course-grid {
        grid-template-columns: 1fr;
    }
    
    .price-card {
        padding: 2rem;
    }
}