/* สีธีม: สีขาวเป็นหลัก (70%) สีเขียวเป็นรอง (20%) สีทองเป็นเสริม (10%) */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-green: #1a543b;
    --primary-gold: #c6a357;
    --white: #FFFFFF;
    --text-dark: #1f2937;
    --text-gray: #6b7280;
    --bg-light: #f9fafb;
    --bg-lighter: #fefefe;
    --border-color: #e5e7eb;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
}

body {
    font-family: 'Sarabun', 'Sukhumvit Set', Arial, sans-serif;
    background: var(--bg-light);
    min-height: 100vh;
    padding: 20px;
    color: var(--text-dark);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

/* Header */
.header {
    background: var(--white);
    color: var(--primary-green);
    padding: 40px 30px;
    text-align: center;
    border-bottom: 3px solid var(--primary-green);
}

.header-content h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--primary-green);
}

.subtitle {
    font-size: 1rem;
    color: var(--text-gray);
}

/* Progress Bar */
.progress-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    background: var(--white);
}

.progress-step {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.step-circle {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--white);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.2rem;
    color: var(--text-gray);
    transition: all 0.3s ease;
    margin-bottom: 10px;
}

.progress-step.active .step-circle {
    background: var(--primary-green);
    border-color: var(--primary-green);
    color: var(--white);
}

.step-label {
    font-size: 0.85rem;
    color: var(--text-gray);
}

.progress-step.active .step-label {
    color: var(--primary-green);
    font-weight: 600;
}

.progress-line {
    width: 100px;
    height: 2px;
    background: var(--border-color);
    margin: 0 10px 30px;
}

/* Main Content */
.main-content {
    padding: 40px 30px;
    min-height: 500px;
    background: var(--white);
}

.step-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.step-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.step-content h2 {
    font-size: 1.8rem;
    color: var(--primary-green);
    margin-bottom: 10px;
    text-align: center;
    font-weight: 600;
}

.instruction {
    text-align: center;
    color: var(--text-gray);
    margin-bottom: 30px;
    font-size: 0.95rem;
}

/* Course Grid */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.course-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
}

.course-card:hover {
    border-color: var(--primary-green);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.course-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.course-card h3 {
    font-size: 1.3rem;
    color: var(--primary-green);
    margin-bottom: 10px;
    font-weight: 600;
}

.course-card p {
    color: var(--text-gray);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 20px;
    min-height: 80px;
}

.btn-select {
    background: var(--primary-green);
    color: var(--white);
    border: none;
    padding: 10px 24px;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    width: 100%;
}

.btn-select:hover {
    background: #2d6a4f;
}

/* Form */
.selected-course-display {
    background: var(--bg-light);
    padding: 15px 20px;
    border-radius: 8px;
    text-align: center;
    margin-bottom: 30px;
    border: 1px solid var(--primary-green);
}

.selected-course-display .label {
    color: var(--text-gray);
    font-size: 0.9rem;
}

.selected-course-display .course-name {
    color: var(--primary-green);
    font-size: 1.2rem;
    font-weight: 600;
    margin-left: 8px;
}

.form {
    max-width: 600px;
    margin: 0 auto;
}

.form-section {
    margin-bottom: 35px;
    padding: 25px;
    background: var(--bg-lighter);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.section-title {
    color: var(--primary-green);
    font-size: 1.1rem;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 600;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.required {
    color: var(--danger-color);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--white);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-green);
    box-shadow: 0 0 0 3px rgba(26, 84, 59, 0.05);
}

.field-note {
    display: block;
    margin-top: 6px;
    color: var(--text-gray);
    font-size: 0.85rem;
    font-style: italic;
}

/* Student Info Card */
.student-info-card, .event-info-card {
    background: var(--bg-lighter);
    padding: 25px;
    border-radius: 8px;
    margin-bottom: 25px;
    border: 1px solid var(--border-color);
}

.student-info-card h3, .event-info-card h3 {
    color: var(--primary-green);
    margin-bottom: 20px;
    font-size: 1.1rem;
    font-weight: 600;
}

.info-row {
    display: flex;
    padding: 10px 0;
    border-bottom: 1px solid var(--border-color);
}

.info-row:last-child {
    border-bottom: none;
}

.info-label {
    font-weight: 500;
    color: var(--text-gray);
    min-width: 150px;
    font-size: 0.9rem;
}

.info-value {
    color: var(--text-dark);
    font-weight: 500;
}

.event-details {
    color: var(--text-dark);
    line-height: 1.8;
}

.event-details p {
    margin-bottom: 8px;
}

/* Radio Options */
.radio-group {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.radio-option {
    display: flex;
    align-items: flex-start;
    padding: 18px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    background: var(--white);
}

.radio-option:hover {
    border-color: var(--primary-green);
    background: var(--bg-lighter);
}

.radio-option input[type="radio"] {
    position: absolute;
    opacity: 0;
}

.radio-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    margin-right: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 2px;
}

.radio-custom::after {
    content: '';
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary-green);
    transform: scale(0);
    transition: transform 0.3s ease;
}

.radio-option input[type="radio"]:checked ~ .radio-custom {
    border-color: var(--primary-green);
}

.radio-option input[type="radio"]:checked ~ .radio-custom::after {
    transform: scale(1);
}

.radio-text strong {
    font-size: 1rem;
    color: var(--primary-green);
    display: block;
    margin-bottom: 4px;
}

.radio-text small {
    color: var(--text-gray);
    font-size: 0.85rem;
}

/* Buttons */
.button-group {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
}

.btn-primary, .btn-back {
    padding: 12px 32px;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

.btn-primary:hover {
    background: #2d6a4f;
}

.btn-primary.btn-large {
    padding: 14px 40px;
    font-size: 1.05rem;
}

.btn-back {
    background: var(--white);
    color: var(--text-gray);
    border: 1px solid var(--border-color);
}

.btn-back:hover {
    background: var(--bg-light);
    border-color: var(--text-gray);
}

/* Success/Info Cards */
.success-card, .info-card {
    text-align: center;
    padding: 40px;
}

.success-icon, .info-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.success-card h2 {
    color: var(--success-color);
    font-weight: 600;
    margin-bottom: 15px;
}

.info-card h2 {
    color: var(--primary-green);
    font-weight: 600;
    margin-bottom: 15px;
}

.success-text, .info-text {
    color: var(--text-gray);
    margin-bottom: 20px;
}

.success-info, .registered-info {
    background: var(--bg-lighter);
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
    text-align: left;
    border: 1px solid var(--border-color);
}

.success-info p, .registered-info p {
    margin-bottom: 10px;
}

/* Loading */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--primary-green);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-overlay p {
    color: var(--white);
    margin-top: 20px;
    font-size: 0.95rem;
}

/* Footer */
.footer {
    background: var(--bg-light);
    padding: 25px;
    text-align: center;
    border-top: 1px solid var(--border-color);
    font-size: 0.9rem;
    color: var(--text-gray);
}

.admin-link {
    margin-top: 10px;
}

.admin-link a {
    color: var(--primary-green);
    text-decoration: none;
    font-weight: 500;
}

.admin-link a:hover {
    color: var(--primary-gold);
}

/* Responsive */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    .header-content h1 {
        font-size: 1.5rem;
    }
    
    .course-grid {
        grid-template-columns: 1fr;
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn-primary, .btn-back {
        width: 100%;
    }
    
    .main-content {
        padding: 30px 20px;
    }
}