:root {
    /* 顏色變數 */
    --bg-color: #fff5f5;
    --card-bg: #ffffff;
    --card-bg-alt: #fff0f0;
    --text-primary: #2a2620;
    --text-secondary: #6b5f4a;
    --border-color: #f5d5d5;
    --primary-pink: #ff6b9d;
    --primary-pink-dark: #e84a7f;
    --accent-pink: #ff8fb3;
    
    /* 間距 */
    --spacing-sm: 0.75rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2.5rem;
    
    /* 圓角 */
    --radius-card: 12px;
    --radius-button: 8px;
}

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

body {
    font-family: 'Segoe UI', 'Microsoft JhengHei', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-pink), var(--primary-pink-dark));
    color: white;
    padding: var(--spacing-lg) 0;
    text-align: center;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
}

/* Main */
main {
    flex: 1;
    padding: var(--spacing-lg) 0;
}

section {
    margin-bottom: var(--spacing-lg);
}

h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

/* Highlights */
.highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius-card);
    padding: var(--spacing-md);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

.icon-box {
    width: 56px;
    height: 56px;
    background: var(--bg-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-sm);
}

.icon-box svg {
    width: 28px;
    height: 28px;
    color: var(--primary-pink);
}

.card h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

/* Course Content */
.content-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.content-item {
    background: var(--card-bg-alt);
    border-radius: var(--radius-card);
    padding: var(--spacing-md);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    border: 1px solid var(--border-color);
}

.content-number {
    width: 48px;
    height: 48px;
    background: var(--primary-pink-dark);
    color: white;
    border-radius: var(--radius-card);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    font-weight: 700;
    flex-shrink: 0;
}

.content-text h3 {
    font-size: 1.1rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.content-text p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Instructor */
.instructor-card {
    background: var(--card-bg);
    border-radius: var(--radius-card);
    padding: var(--spacing-md);
    text-align: center;
    border: 1px solid var(--border-color);
}

.instructor-info h3 {
    font-size: 1.3rem;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.instructor-title {
    color: var(--primary-pink);
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.instructor-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Items Grid */
.items-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
}

.item-card {
    cursor: pointer;
}

.item-card input[type="radio"] {
    display: none;
}

.item-content {
    background: var(--card-bg);
    border-radius: var(--radius-card);
    padding: var(--spacing-md);
    text-align: center;
    border: 2px solid var(--border-color);
    transition: all 0.2s ease;
}

.item-card input[type="radio"]:checked + .item-content {
    border-color: var(--primary-orange);
    background: var(--card-bg-alt);
    box-shadow: 0 4px 16px rgba(255, 140, 66, 0.15);
}

.item-icon {
    width: 56px;
    height: 56px;
    background: var(--bg-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-sm);
}

.item-icon svg {
    width: 28px;
    height: 28px;
    color: var(--primary-orange);
}

.item-content h3 {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.item-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Form Section */
.registration-form {
    background: var(--card-bg);
    border-radius: var(--radius-card);
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
}

.form-group {
    margin-bottom: var(--spacing-md);
}

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

.form-group input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-button);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-orange);
    box-shadow: 0 0 0 3px rgba(255, 140, 66, 0.1);
}

.form-group input::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

.submit-button {
    background: var(--primary-orange);
    color: white;
    border: none;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: var(--radius-button);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: background 0.2s ease, transform 0.2s ease;
    width: 100%;
    justify-content: center;
}

.submit-button:hover {
    background: var(--primary-orange-dark);
    transform: translateY(-2px);
}

.submit-button svg {
    width: 20px;
    height: 20px;
}

/* Audience */
.tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.tag {
    background: var(--card-bg);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.95rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

/* Pricing */
.price-card {
    background: var(--card-bg);
    border-radius: var(--radius-card);
    padding: var(--spacing-lg);
    text-align: center;
    border: 2px solid var(--primary-pink);
    box-shadow: 0 4px 16px rgba(255, 107, 157, 0.15);
}

.price-card h2 {
    margin-bottom: var(--spacing-md);
}

.price {
    margin: var(--spacing-md) 0;
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
}

.currency {
    font-size: 1.5rem;
    color: var(--text-secondary);
}

.amount {
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-pink);
}

.price-note {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.cta-button {
    background: var(--primary-pink);
    color: white;
    border: none;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: var(--radius-button);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: background 0.2s ease, transform 0.2s ease;
}

.cta-button:hover {
    background: var(--primary-pink-dark);
    transform: translateY(-2px);
}

.cta-button svg {
    width: 20px;
    height: 20px;
}

/* Notes */
.notes ul {
    list-style: none;
    background: var(--card-bg-alt);
    border-radius: var(--radius-card);
    padding: var(--spacing-md);
}

.notes li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.notes li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-pink-dark);
    font-weight: bold;
}

/* Footer */
footer {
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-md) 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Toast Message */
.toast-message {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text-primary);
    color: white;
    padding: 1rem 2rem;
    border-radius: var(--radius-button);
    font-size: 0.95rem;
    z-index: 1000;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

/* Responsive */
@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    .highlights {
        grid-template-columns: 1fr;
    }
    
    .amount {
        font-size: 2.5rem;
    }
    
    .cta-button {
        width: 100%;
        justify-content: center;
    }
    
    .toast-message {
        width: 90%;
        text-align: center;
    }
}