:root {
    --bg-primary: #faf6ed;
    --bg-card: #ffffff;
    --bg-card-alt: #fffbf3;
    --text-primary: #2a2620;
    --text-secondary: #6b5f4a;
    --border-color: #e8dfce;
    --primary-color: #0184ff;
    --primary-hover: #0166cc;
    --accent-color: #3d7a5f;
    --accent-hover: #2d5a47;
    --danger-color: #c85a3a;
    --radius-card: 12px;
    --radius-button: 8px;
    --spacing-section: 3rem;
    --max-width: 1200px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans TC", sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.header {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

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

.logo i {
    color: var(--primary-color);
}

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

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

.nav a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    padding: 4rem 0;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-card-alt) 100%);
}

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

.hero-content {
    max-width: 500px;
}

.badge {
    display: inline-block;
    background-color: var(--accent-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-button);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 1rem;
}

.hero h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

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

.hero-info {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.info-item i {
    color: var(--primary-color);
}

.hero-cta {
    display: flex;
    gap: 1rem;
}

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

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
}

.btn-secondary {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background-color: var(--primary-color);
    color: white;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-full {
    width: 100%;
}

/* Card */
.card {
    background-color: var(--bg-card);
    border-radius: var(--radius-card);
    padding: 2rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
}

.pricing-card {
    max-width: 350px;
}

.pricing-header {
    text-align: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

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

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

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

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

.pricing-features {
    list-style: none;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    color: var(--text-secondary);
}

.pricing-features i {
    color: var(--accent-color);
    flex-shrink: 0;
}

/* Features Section */
.features {
    padding: var(--spacing-section) 0;
    background-color: var(--bg-card);
}

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

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

.feature-card {
    background-color: var(--bg-card-alt);
    padding: 2rem;
    border-radius: var(--radius-card);
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background-color: var(--primary-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.feature-icon i {
    color: white;
    width: 32px;
    height: 32px;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

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

/* Instructor Section */
.instructor {
    padding: var(--spacing-section) 0;
    background-color: var(--bg-card-alt);
}

.instructor-card {
    display: flex;
    gap: 3rem;
    align-items: center;
    background-color: var(--bg-card);
    border-radius: var(--radius-card);
    padding: 3rem;
    border: 1px solid var(--border-color);
    max-width: 900px;
    margin: 0 auto;
}

.instructor-avatar {
    flex-shrink: 0;
}

.avatar-img {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--border-color);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.instructor-info {
    flex: 1;
}

.instructor-name {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.instructor-title {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.instructor-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tag {
    background-color: var(--bg-card-alt);
    color: var(--primary-color);
    padding: 0.375rem 0.875rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid var(--border-color);
}

.instructor-desc {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.instructor-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.highlight-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.highlight-item i {
    color: var(--accent-color);
    width: 20px;
    height: 20px;
}

/* Content Section */
.content {
    padding: var(--spacing-section) 0;
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.content-card {
    background-color: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius-card);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.content-number {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 3rem;
    font-weight: 700;
    color: var(--border-color);
    line-height: 1;
}

.content-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
    padding-right: 2rem;
}

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

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

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

/* Pricing Section */
.pricing {
    padding: var(--spacing-section) 0;
    background-color: var(--bg-card);
}

.pricing-card-large {
    background-color: var(--bg-card-alt);
    border-radius: var(--radius-card);
    padding: 3rem;
    max-width: 600px;
    margin: 0 auto;
    border: 2px solid var(--primary-color);
    position: relative;
}

.pricing-badge {
    position: absolute;
    top: -12px;
    right: 2rem;
    background-color: var(--danger-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-button);
    font-weight: 600;
    font-size: 0.875rem;
}

.pricing-header-large {
    text-align: center;
    margin-bottom: 2rem;
}

.pricing-header-large h3 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.pricing-subtitle {
    color: var(--text-secondary);
}

.pricing-body {
    text-align: center;
}

.price-large {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.25rem;
    margin-bottom: 2rem;
}

.price-large .currency {
    font-size: 1.5rem;
}

.price-large .amount {
    font-size: 4rem;
}

.price-large .period {
    color: var(--text-secondary);
    font-size: 1.25rem;
}

.pricing-features-large {
    list-style: none;
    margin-bottom: 2rem;
    text-align: left;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

.pricing-features-large li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    color: var(--text-secondary);
}

.pricing-features-large i {
    color: var(--accent-color);
    flex-shrink: 0;
}

.pricing-note {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 1rem;
}

/* Footer */
.footer {
    background-color: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 2rem 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

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

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
}

.footer-links a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

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

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--bg-card);
    border-radius: var(--radius-card);
    padding: 2rem;
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-header h3 {
    font-size: 1.5rem;
}

.modal-close {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    color: var(--text-primary);
}

/* Form */
.signup-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-button);
    font-size: 1rem;
    font-family: inherit;
    background-color: var(--bg-card-alt);
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
}

/* Responsive */
@media (max-width: 768px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content {
        max-width: 100%;
    }

    .hero-info {
        justify-content: center;
        flex-wrap: wrap;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-visual {
        display: flex;
        justify-content: center;
    }

    .nav {
        display: none;
    }

    .instructor-card {
        flex-direction: column;
        padding: 2rem;
        text-align: center;
    }

    .instructor-highlights {
        justify-content: center;
    }

    .avatar-img {
        width: 140px;
        height: 140px;
    }

    .footer-content {
        flex-direction: column;
        gap: 1.5rem;
        text-align: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .pricing-card-large {
        padding: 2rem;
    }

    .price-large .amount {
        font-size: 3rem;
    }
}