:root {
    --primary-blue: #2176ae;
    --secondary-blue: #74ACDF;
    --light-blue: #e0ecfa;
    --extra-light-blue: #f5faff;
    --border-blue: #c5dfff;
    --dark-blue: #1a345e;
    --accent-blue: #074074;
}
body {
    font-family: 'LINE Seed Sans TH', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, var(--light-blue) 0%, var(--extra-light-blue) 50%, #ffffff 100%);
    color: var(--dark-blue);
    min-height: 100vh;
}
.container { max-width: 1200px; }
.main-title {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: 2.5rem;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    letter-spacing: 1.2px;
    text-shadow: 0 4px 20px rgba(33, 118, 174, 0.1);
}
.main-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-blue), var(--secondary-blue));
    border-radius: 2px;
    animation: slideIn 1s ease-out;
}
@keyframes slideIn { from { width: 0; } to { width: 80px; } }
.sidebar-card {
    background: rgba(255,255,255,0.98);
    border-radius: 18px;
    box-shadow: 0 4px 18px rgba(33, 118, 174, 0.10);
    padding: 2rem 1.5rem;
    margin-bottom: 2rem;
    position: sticky;
    top: 100px;
}
.form-label { font-weight: 700; font-size: 1.07rem; }
.form-select {
    font-size: 1.11rem;
    padding: 0.6rem 1.2rem;
    border-radius: 12px;
    border: 1px solid var(--border-blue);
}
.course-card {
    background: rgba(255,255,255,0.98);
    border-radius: 24px;
    box-shadow: 0 10px 30px rgba(33, 118, 174, 0.09),0 1px 8px rgba(33, 118, 174, 0.05);
    padding: 2.5rem 2rem;
    margin-bottom: 2.8rem;
    border-left: 10px solid var(--primary-blue);
    transition: box-shadow 0.2s, transform 0.2s, border-left 0.2s;
    position: relative;
    overflow: hidden;
}
.course-card:hover {
    box-shadow: 0 12px 48px rgba(33, 118, 174, 0.15);
    transform: translateY(-4px) scale(1.01);
    border-left: 10px solid var(--accent-blue);
}
.section-title {
    font-size: 1.6rem;
    color: var(--primary-blue);
    margin-bottom: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.course-card ul { margin-top: 1.2rem; margin-bottom: 0.5rem; }
.course-card li { margin-bottom: 0.7rem; line-height: 1.7; }
.register-btn {
    background: linear-gradient(90deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.7rem 1.5rem;
    font-size: 1rem;
    font-weight: 700;
    box-shadow: 0 2px 8px rgba(33, 118, 174, 0.08);
    transition: background 0.2s, box-shadow 0.2s;
}
.register-btn:hover, .register-btn:focus {
    background: linear-gradient(90deg, var(--accent-blue) 0%, var(--primary-blue) 100%);
    box-shadow: 0 4px 16px rgba(33, 118, 174, 0.12);
    outline: none;
}
.accordion-button {
    font-size: 1.08rem;
    font-weight: 600;
    color: var(--primary-blue);
    background-color: #f3f7ff;
}
.accordion-button:not(.collapsed) {
    color: #fff;
    background-color: var(--primary-blue);
}
.accordion-body {
    background: #f9fbfd;
    color: #333;
}
.teacher-info { font-family: 'Prompt', sans-serif; font-size: 16px; color: #333; }
.course-card ul li { list-style: none; padding: 0.5rem 0; border-bottom: 1px solid #eef0f3; }
.contact-highlight {
    color: var(--primary-blue);
    background: #eaf7ff;
    border-radius: 8px;
    display: inline-block;
    padding: 6px 13px;
    font-weight: 600;
    margin-top: 0.5em;
    margin-bottom: 0.6em;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(33, 118, 174, 0.08);
}
.contact-icon { font-size: 1.1em; vertical-align: middle; margin-right: 5px; }
.social-icons { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 7px; }
.social-icon {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    background: rgba(33, 118, 174, 0.07);
    color: var(--primary-blue);
    padding: 0.3rem 0.7rem;
    border-radius: 8px;
    text-decoration: none;
    font-size: 0.9em;
    font-weight: 500;
    transition: all 0.3s ease;
}
.social-icon:hover {background: var(--primary-blue); color: white;}
.badge-level {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}
@media (max-width: 991px) {
    .main-title { font-size: 1.7rem; }
    .sidebar-card { padding: 1.2rem; }
    .course-card { padding: 1.6rem 1rem; }
}
html { scroll-behavior: smooth; }
.contact-phone-link {
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    background: rgba(33,118,174,0.07);
    color: var(--primary-blue);
    padding: 0.34rem 1.1rem 0.34rem 0.7rem;
    border-radius: 9px;
    font-weight: 600;
    font-size: 1.03em;
    text-decoration: none;
    box-shadow: 0 1px 5px rgba(33, 118, 174, 0.05);
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
    margin-bottom: 2px;
}
.contact-phone-link:hover, .contact-phone-link:focus {
    background: var(--primary-blue);
    color: #fff;
    box-shadow: 0 4px 16px rgba(33, 118, 174, 0.12);
    text-decoration: none;
}

.phone-icon-wrap {
    background: linear-gradient(135deg, var(--primary-blue) 60%, var(--secondary-blue));
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.05em;
    height: 2.05em;
    margin-right: 4px;
    box-shadow: 0 2px 6px rgba(33, 118, 174, 0.12);
    transition: background 0.2s;
}
.contact-phone-link:hover .phone-icon-wrap {
    background: #fff;
}
.phone-icon {
    color: #fff;
    font-size: 1.18em;
    transition: color 0.2s;
}
.contact-phone-link:hover .phone-icon {
    color: var(--primary-blue);
}
.phone-number {
    font-size: 1.05em;
    letter-spacing: 0.5px;
}


/* Contact Channels - Balanced Design */
.contact-channels {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    margin-top: 0.5rem;
}

.contact-item-inline {
    display: inline-block;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid var(--border-blue);
    border-radius: 12px;
    text-decoration: none;
    color: var(--dark-blue);
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(33, 118, 174, 0.06);
    min-width: 140px;
}

.contact-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(33, 118, 174, 0.12);
    border-color: var(--primary-blue);
    text-decoration: none;
    color: var(--dark-blue);
}

.contact-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    color: white;
    flex-shrink: 0;
}

.phone-icon {
    background: linear-gradient(135deg, #28a745, #20c997);
}

.social-icon {
    /* สีจะถูกกำหนดแบบ inline ใน PHP */
}

.contact-text {
    display: flex;
    flex-direction: column;
    gap: 1px;
}

.contact-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: #6c757d;
    line-height: 1;
}

.contact-value {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary-blue);
    line-height: 1.2;
}

.phone-link:hover .contact-value {
    color: #28a745;
}

/* Responsive */
@media (max-width: 768px) {
    .contact-channels {
        gap: 0.5rem;
    }
    
    .contact-link {
        padding: 0.5rem 0.8rem;
        min-width: 120px;
    }
    
    .contact-icon {
        width: 28px;
        height: 28px;
        font-size: 0.9rem;
    }
    
    .contact-label {
        font-size: 0.7rem;
    }
    
    .contact-value {
        font-size: 0.85rem;
    }
}
.contact-icon.phone-bg {
    background: linear-gradient(135deg, #6ee7b7 60%, #34d399 100%);
}
.contact-icon.line-bg {
    background: linear-gradient(135deg, #a8e063 60%, #00c300 100%);
}
.contact-icon.fb-bg {
    background: linear-gradient(135deg, #b3d2fa 60%, #82b6f9 100%);
}
.contact-icon.ig-bg {
    background: linear-gradient(135deg, #fbc2eb 60%, #e493ae 100%);
}
.contact-icon.tiktok-bg {
    background: linear-gradient(135deg, #cfd9df 60%, #222 100%);
}