/* Global Custom Variables & Root Settings */
:root {
    --primary-color: #0f172a;       /* Slate 900 (Main theme) */
    --primary-light: #1e293b;      /* Slate 800 */
    --accent-color: #f59e0b;       /* Gold/Amber 500 */
    --accent-hover: #d97706;       /* Gold/Amber 600 */
    --text-color: #334155;         /* Slate 700 */
    --text-light: #64748b;         /* Slate 500 */
    --bg-light: #ffffff;           /* Full White */
    --bg-card: #ffffff;
    --border-color: #e2e8f0;       /* Slate 200 */
    --white: #ffffff;
    --success-color: #10b981;
    --error-color: #ef4444;
    --glow-color: rgba(245, 158, 11, 0.15);
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;
    
    --transition-smooth: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    --box-shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
    --box-shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.05), 0 4px 6px -2px rgba(0, 0, 0, 0.02);
    --box-shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* Reset Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
    overflow-x: hidden;
    width: 100%;
}

body {
    font-family: var(--font-body);
    color: var(--text-color);
    background-color: var(--bg-light);
    line-height: 1.6;
    overflow-x: hidden;
    width: 100%;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--primary-color);
    font-weight: 700;
    line-height: 1.25;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-smooth);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Utility Components */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

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

.badge {
    display: inline-block;
    padding: 6px 16px;
    background-color: rgba(245, 158, 11, 0.1);
    color: var(--accent-hover);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 28px;
    font-family: var(--font-heading);
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-smooth);
    cursor: pointer;
    font-size: 1rem;
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(245, 158, 11, 0.25);
}

.btn-contact-nav {
    border-radius: 100px;
    background-color: transparent;
    border: 2px solid var(--accent-color);
    color: var(--primary-color);
    padding: 10px 24px;
    font-size: 0.95rem;
}

.btn-contact-nav:hover {
    background-color: var(--accent-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(245, 158, 11, 0.2);
}

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

.btn-secondary:hover {
    background-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(15, 23, 42, 0.15);
}

.w-100 {
    width: 100%;
}

/* Header & Navigation (Floating Capsule) */
.site-header {
    position: fixed;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 48px);
    max-width: 1200px;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(15, 23, 42, 0.08);
    border-radius: 100px;
    box-shadow: 0 8px 32px 0 rgba(15, 23, 42, 0.06);
    transition: var(--transition-smooth);
}

.site-header.scrolled {
    top: 10px;
    background-color: rgba(255, 255, 255, 0.97);
    box-shadow: 0 10px 40px 0 rgba(15, 23, 42, 0.12);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    padding: 0 28px;
    transition: var(--transition-smooth);
}

.site-header.scrolled .header-container {
    height: 64px;
}

.logo-wrapper {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.nav-logo {
    height: 44px;
    width: auto;
    max-width: 110px;
    object-fit: contain;
    border-radius: 8px;
    background-color: #ffffff;
    padding: 2px;
    border: 1px solid var(--border-color);
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary-color);
    letter-spacing: -0.5px;
    white-space: nowrap;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-link {
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-color);
    position: relative;
    padding: 8px 0;
    white-space: nowrap;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition-smooth);
}

.nav-link:hover, .nav-link.active {
    color: var(--primary-color);
}

.nav-link:hover::after, .nav-link.active::after {
    width: 100%;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.mobile-menu-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(15, 23, 42, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    color: var(--primary-color);
    transition: var(--transition-smooth);
}

.mobile-menu-toggle:hover {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: var(--primary-color);
}

.mobile-menu-toggle i {
    width: 20px;
    height: 20px;
}

/* Mobile Drawer */
.mobile-drawer {
    position: fixed;
    top: 0;
    right: -340px;
    width: 300px;
    height: 100vh;
    background-color: var(--white);
    z-index: 1000;
    padding: 28px 24px;
    display: flex;
    flex-direction: column;
    gap: 28px;
    box-shadow: -8px 0 40px rgba(15, 23, 42, 0.12);
    transition: var(--transition-smooth);
}

.mobile-drawer.open {
    right: 0;
}

.drawer-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

.close-drawer {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: rgba(15, 23, 42, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    color: var(--primary-color);
    transition: var(--transition-smooth);
}

.close-drawer:hover {
    background: var(--primary-color);
    color: var(--white);
}

.close-drawer i {
    width: 18px;
    height: 18px;
}

.drawer-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.drawer-link {
    font-family: var(--font-heading);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-color);
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-smooth);
}

.drawer-link:hover {
    background-color: var(--bg-light);
    color: var(--primary-color);
    padding-left: 20px;
}

.drawer-btn {
    margin-top: 8px;
    padding: 14px 24px;
    border-radius: 100px;
    background-color: transparent;
    border: 2px solid var(--accent-color);
    color: var(--primary-color);
    font-weight: 700;
    text-align: center;
}

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

.drawer-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-smooth);
}

.drawer-overlay.open {
    opacity: 1;
    pointer-events: auto;
}

/* Sections Styling */
section {
    padding: 100px 0;
}

.section-header {
    max-width: 600px;
    margin: 0 auto 60px auto;
}

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.section-desc {
    color: var(--text-light);
    font-size: 1.1rem;
}

/* Hero Section */
.hero-section {
    padding-top: 160px;
    padding-bottom: 100px;
    background: #ffffff;
    position: relative;
    overflow: hidden;
    text-align: center;
}

/* White contrast overlay sits between slideshow and content */
.hero-section::after {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.90);
    z-index: 0;
    pointer-events: none;
}

/* Hero Horizontal Slideshow Background */
.hero-bg-slideshow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
    opacity: 0.55; /* More visible images, contrast handled by overlay */
}

.slides-track {
    display: flex;
    width: 400%;
    height: 100%;
    animation: sideScrollSlideshow 12s cubic-bezier(0.85, 0, 0.15, 1) infinite;
    will-change: transform;
}

.slides-track img {
    width: 25%;
    height: 100%;
    object-fit: cover;
}

@keyframes sideScrollSlideshow {
    0%, 18.3% {
        transform: translateX(0%);
    }
    25%, 43.3% {
        transform: translateX(-25%);
    }
    50%, 68.3% {
        transform: translateX(-50%);
    }
    75%, 93.3% {
        transform: translateX(-75%);
    }
    100% {
        transform: translateX(0%);
    }
}


.hero-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 860px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero-content {
    width: 100%;
}

.hero-content h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.12;
    margin-bottom: 28px;
    letter-spacing: -1.5px;
    color: var(--primary-color);
}

.hero-content h1 em {
    font-style: italic;
    font-weight: 700;
    color: var(--accent-hover);
    position: relative;
    display: inline-block;
}

/* Pencil-draw curve line under "Sithusara" */
.pencil-curve {
    display: block;
    width: 100%;
    height: 16px;
    overflow: visible;
    margin-top: -2px;
    color: var(--accent-color);
    stroke-dasharray: 150;
    stroke-dashoffset: 150;
    animation: drawCurve 1.2s cubic-bezier(0.4, 0, 0.2, 1) 0.4s forwards;
}

@keyframes drawCurve {
    to {
        stroke-dashoffset: 0;
    }
}

.hero-content .lead {
    font-size: 1.2rem;
    color: var(--text-color);
    margin-bottom: 44px;
    line-height: 1.75;
    max-width: 680px;
    margin-left: auto;
    margin-right: auto;
}

.hero-ctas {
    display: flex;
    gap: 16px;
    margin-bottom: 64px;
    justify-content: center;
}

/* Hero Button Capsule Styles */
.hero-ctas .btn {
    border-radius: 100px; /* Capsule shape */
    padding: 14px 36px;
    font-size: 0.95rem;
}

/* Explore Teachers - Outline Capsule */
.hero-ctas .btn-explore {
    background-color: transparent;
    border: 2px solid var(--accent-color);
    color: var(--primary-color);
}

.hero-ctas .btn-explore:hover {
    background-color: var(--accent-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.2);
}

/* Enroll Now - Solid Filled Capsule */
.hero-ctas .btn-enroll {
    background-color: var(--primary-color);
    color: var(--white);
    border: 2px solid var(--primary-color);
    isolation: isolate;
    mix-blend-mode: normal;
    opacity: 1;
}

.hero-ctas .btn-enroll:hover {
    background-color: var(--primary-light);
    border-color: var(--primary-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(15, 23, 42, 0.15);
}

.hero-stats {
    display: flex;
    gap: 0;
    border-top: 1px solid rgba(15, 23, 42, 0.08);
    padding-top: 36px;
    justify-content: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 48px;
    border-right: 1px solid rgba(15, 23, 42, 0.08);
}

.stat-item:last-child {
    border-right: none;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: 6px;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-light);
    font-weight: 500;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}


/* About Section */
.about-section {
    background-color: var(--white);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.feature-card {
    padding: 40px;
    background-color: var(--bg-light);
    border-radius: var(--border-radius-md);
    transition: var(--transition-smooth);
    border: 1px solid var(--border-color);
}

.feature-card:hover {
    transform: translateY(-8px);
    background-color: var(--white);
    box-shadow: var(--box-shadow-md);
    border-color: rgba(245, 158, 11, 0.3);
}

.feature-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background-color: var(--primary-color);
    color: var(--accent-color);
    border-radius: var(--border-radius-sm);
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 1.35rem;
    margin-bottom: 16px;
}

.feature-card p {
    color: var(--text-light);
}

/* Teachers Section */
.teachers-section {
    background-color: var(--bg-light);
}

.teachers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 320px));
    justify-content: center;
    gap: 28px;
}

.teacher-card {
    display: flex;
    flex-direction: column;
    background-color: var(--white);
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--box-shadow-sm);
    transition: var(--transition-smooth);
    border: 1px solid var(--border-color);
}

.teacher-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--box-shadow-lg);
    border-color: rgba(245, 158, 11, 0.2);
}

.teacher-image-container {
    width: 100%;
    height: 220px;
    position: relative;
    overflow: hidden;
}

.teacher-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.teacher-card:hover .teacher-image {
    transform: scale(1.05);
}

.teacher-subject-tag {
    position: absolute;
    top: 16px;
    left: 16px;
    background-color: var(--primary-color);
    color: var(--accent-color);
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 6px 12px;
    border-radius: 4px;
}

.teacher-info {
    padding: 20px 24px 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.teacher-info h3 {
    font-size: 1.15rem;
    margin-bottom: 6px;
    color: var(--primary-color);
}

.teacher-subject {
    display: inline-block;
    background-color: var(--primary-color);
    color: var(--accent-color);
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    padding: 4px 14px;
    border-radius: 100px;
    font-family: var(--font-heading);
}

.btn-teacher-details {
    display: inline-block;
    border: 1.5px solid var(--primary-color);
    color: var(--primary-color);
    background-color: transparent;
    padding: 6px 18px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 100px;
    margin-top: 14px;
    cursor: pointer;
    transition: var(--transition-smooth);
    text-decoration: none;
}

.btn-teacher-details:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.1);
}

/* Shimmer Skeleton Loading Styles */
.skeleton {
    pointer-events: none;
    user-select: none;
}

.skeleton-img {
    background: #e2e8f0;
    position: relative;
    overflow: hidden;
}

.skeleton-text {
    background: #e2e8f0;
    border-radius: 4px;
    position: relative;
    overflow: hidden;
}

.skeleton-title {
    width: 140px;
    height: 18px;
    margin-bottom: 12px;
}

.skeleton-sub {
    width: 90px;
    height: 14px;
    margin-bottom: 8px;
}

.skeleton-btn {
    width: 110px;
    height: 32px;
    background: #e2e8f0;
    border-radius: 100px;
    margin-top: 14px;
    position: relative;
    overflow: hidden;
}

.skeleton::after,
.skeleton-img::after,
.skeleton-text::after,
.skeleton-btn::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: linear-gradient(
        90deg,
        rgba(255, 255, 255, 0) 0%,
        rgba(255, 255, 255, 0.4) 20%,
        rgba(255, 255, 255, 0.6) 60%,
        rgba(255, 255, 255, 0) 100%
    );
    transform: translateX(-100%);
    animation: shimmer 1.5s infinite;
}

@keyframes shimmer {
    100% {
        transform: translateX(100%);
    }
}


.teacher-role {
    color: var(--accent-hover);
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.teacher-bio {
    color: var(--text-light);
    font-size: 0.95rem;
    margin-bottom: 20px;
    line-height: 1.5;
}

.teacher-features {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.t-feat {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary-color);
}

.t-feat i {
    color: var(--success-color);
    width: 16px;
    height: 16px;
}

/* Gallery Slider Section */
.gallery-slider-section {
    background-color: var(--white);
    padding-top: 60px;
    padding-bottom: 80px;
}

.slider-wrapper {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    box-shadow: var(--box-shadow-lg);
}

/* Slides */
.slider-track {
    position: relative;
    width: 100%;
    height: 520px;
}

.slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.slide.active {
    opacity: 1;
    pointer-events: auto;
}

.slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* Arrow Buttons */
.slider-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    background: rgba(255, 255, 255, 0.92);
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 16px rgba(0,0,0,0.15);
    transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
    color: var(--primary-color);
}

.slider-arrow:hover {
    background: var(--accent-color);
    color: var(--primary-color);
    transform: translateY(-50%) scale(1.1);
    box-shadow: 0 6px 24px rgba(245, 158, 11, 0.35);
}

.slider-arrow i {
    width: 22px;
    height: 22px;
}

.slider-arrow-left  { left: 16px; }
.slider-arrow-right { right: 16px; }

/* Dots */
.slider-dots {
    position: absolute;
    bottom: 18px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}

.dot {
    width: 32px;
    height: 5px;
    border-radius: 100px;
    border: none;
    background: rgba(255, 255, 255, 0.45);
    cursor: pointer;
    padding: 0;
    transition: background 0.3s;
    position: relative;
    overflow: hidden;
}

.dot::after {
    content: '';
    position: absolute;
    inset: 0;
    left: -100%;
    background: var(--accent-color);
    border-radius: 100px;
    transition: left 0s;
}

.dot.active {
    background: rgba(255, 255, 255, 0.3);
}

.dot.active::after {
    left: 0;
    transition: left 3s linear;
}


.gallery-scroller-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
    width: 100%;
    overflow: hidden;
    padding: 10px 0;
}

.gallery-row {
    width: 100%;
    overflow: hidden;
}

.gallery-track {
    display: flex;
    gap: 24px;
    width: max-content;
    will-change: transform;
}

.scroll-left .gallery-track {
    animation: scrollLeft 35s linear infinite;
}

.scroll-right .gallery-track {
    animation: scrollRight 35s linear infinite;
}

/* Pause animation on hover */
.gallery-track:hover {
    animation-play-state: paused;
}

.gallery-item {
    cursor: pointer;
    border-radius: var(--border-radius-md);
    overflow: hidden;
    position: relative;
    width: 360px;
    height: 270px;
    flex-shrink: 0;
    box-shadow: var(--box-shadow-sm);
    transition: var(--transition-smooth);
    border: 1px solid var(--border-color);
}

.gallery-item:hover {
    box-shadow: var(--box-shadow-lg);
    border-color: rgba(245, 158, 11, 0.2);
}

.gallery-img-wrapper {
    width: 100%;
    height: 100%;
    position: relative;
}

.gallery-img-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-smooth);
}

.gallery-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(15, 23, 42, 0) 30%, rgba(15, 23, 42, 0.95) 100%);
    display: flex;
    align-items: flex-end;
    padding: 24px;
    opacity: 0;
    transition: var(--transition-smooth);
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-item:hover .gallery-img-wrapper img {
    transform: scale(1.05);
}

.gallery-info {
    color: var(--white);
    transform: translateY(15px);
    transition: var(--transition-smooth);
    width: 100%;
    display: flex;
    flex-direction: column;
}

.gallery-item:hover .gallery-info {
    transform: translateY(0);
}

.gallery-info h4 {
    color: var(--white);
    font-size: 1.15rem;
    margin-bottom: 4px;
    font-family: var(--font-heading);
}

.gallery-info p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.85rem;
    margin-bottom: 12px;
}

.zoom-icon {
    align-self: flex-start;
    color: var(--accent-color);
}

/* Animations */
@keyframes scrollLeft {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(calc(-50% - 12px));
    }
}

@keyframes scrollRight {
    0% {
        transform: translateX(calc(-50% - 12px));
    }
    100% {
        transform: translateX(0);
    }
}

/* Contact Section */
.contact-section {
    background-color: var(--bg-light);
}

.contact-grid-container {
    display: grid;
    grid-template-columns: 1fr 1.1fr;
    gap: 60px;
    align-items: flex-start;
}

.contact-info-column h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.contact-intro-text {
    color: var(--text-light);
    margin-bottom: 40px;
    font-size: 1.1rem;
}

.contact-details-list {
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.contact-detail-item {
    display: flex;
    gap: 20px;
}

.detail-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    background-color: rgba(15, 23, 42, 0.05);
    color: var(--primary-color);
    border-radius: var(--border-radius-sm);
    flex-shrink: 0;
}

.detail-content h4 {
    font-size: 1.1rem;
    margin-bottom: 6px;
}

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

.form-card {
    background-color: var(--white);
    padding: 48px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--box-shadow-md);
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.form-card h3 {
    font-size: 1.6rem;
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--primary-color);
}

.form-group input, .form-group select, .form-group textarea {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
    padding: 14px 18px;
    font-family: var(--font-body);
    font-size: 0.95rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    outline: none;
    transition: var(--transition-smooth);
    background-color: var(--bg-light);
}

.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    border-color: var(--accent-color);
    background-color: var(--white);
    box-shadow: 0 0 0 3px var(--glow-color);
}

.error-msg {
    color: var(--error-color);
    font-size: 0.8rem;
    display: none;
}

.form-group.has-error input, .form-group.has-error textarea {
    border-color: var(--error-color);
}

.form-group.has-error .error-msg {
    display: block;
}

.btn-submit {
    height: 52px;
}

.form-success-alert {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--white);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px;
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-smooth);
    z-index: 5;
}

.form-success-alert.show {
    opacity: 1;
    pointer-events: auto;
}

.success-icon {
    width: 64px;
    height: 64px;
    color: var(--success-color);
    margin-bottom: 24px;
}

.form-success-alert h4 {
    font-size: 1.5rem;
    margin-bottom: 12px;
}

.form-success-alert p {
    color: var(--text-light);
}

/* Footer Section */
.site-footer {
    background-color: var(--primary-color);
    color: rgba(255, 255, 255, 0.7);
    padding: 80px 0 0 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-container {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-logo-container {
    display: inline-block;
    background-color: var(--white);
    padding: 10px;
    border-radius: var(--border-radius-md);
    margin-bottom: 20px;
    width: 90px;
    height: 90px;
    overflow: hidden;
}

.footer-logo {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: calc(var(--border-radius-md) - 6px);
}

.footer-brand p {
    max-width: 320px;
    font-size: 0.88rem;
    line-height: 1.6;
}

.footer-links h4, .footer-socials h4 {
    color: var(--white);
    font-size: 1.1rem;
    margin-bottom: 24px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a:hover {
    color: var(--accent-color);
    padding-left: 6px;
}

.social-icons {
    display: flex;
    gap: 16px;
}

.social-icons a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 50%;
    color: var(--white);
    transition: var(--transition-smooth);
}

.social-icons a:hover {
    background-color: var(--accent-color);
    color: var(--primary-color);
    transform: translateY(-3px);
}

.social-icons a svg,
.social-icons a i {
    width: 20px !important;
    height: 20px !important;
    display: inline-block;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 30px 0;
    text-align: center;
    font-size: 0.85rem;
}

/* QR modal — outer wrapper: info card left + QR right */
.qr-modal-wrapper {
    display: flex;
    align-items: stretch;
    gap: 0;
    background: #fff;
    border-radius: 20px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.2);
    overflow: hidden;
    animation: qrCardIn 0.3s cubic-bezier(0.23, 1, 0.32, 1);
    max-width: 90vw;
}

/* Left: class info panel */
.qr-info-card {
    display: flex;
    flex-direction: column;
    gap: 18px;
    padding: 28px 32px;
    background: var(--bg-light, #f8fafc);
    min-width: 250px;
    justify-content: center;
}

.qr-info-label {
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--text-light, #64748b);
    margin-bottom: 2px;
}

.qr-info-row {
    display: flex;
    align-items: flex-start;
    gap: 10px;
}

.qr-info-icon {
    width: 28px;
    height: 28px;
    border-radius: 8px;
    background: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 1px 4px rgba(0,0,0,0.08);
    color: var(--primary-color, #0f172a);
    margin-top: 2px;
}

.qr-info-key {
    font-size: 0.67rem;
    font-weight: 600;
    color: var(--text-light, #64748b);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 2px;
}

.qr-info-val {
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--primary-color, #0f172a);
    line-height: 1.3;
}

.qr-info-fee {
    border-top: 1px dashed rgba(0,0,0,0.1);
    padding-top: 14px;
    margin-top: -4px;
}

.qr-price-tag {
    font-size: 1rem;
    font-weight: 800;
    color: var(--accent-color, #c9a84c);
}

/* Vertical divider between panels */
.qr-modal-divider {
    width: 1px;
    background: rgba(0,0,0,0.07);
    flex-shrink: 0;
    align-self: stretch;
}

/* Right: QR code panel — no box-shadow (wrapper handles it) */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-color: rgba(15, 23, 42, 0.95);
    z-index: 1100;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition-smooth);
}

.lightbox.open {
    opacity: 1;
    pointer-events: auto;
}

.lightbox-close {
    position: absolute;
    top: 24px;
    right: 24px;
    background: none;
    border: none;
    color: var(--white);
    cursor: pointer;
}

.lightbox-img {
    max-width: 85%;
    max-height: 75%;
    border-radius: var(--border-radius-sm);
    box-shadow: var(--box-shadow-lg);
    transform: scale(0.95);
    transition: var(--transition-smooth);
}

.lightbox.open .lightbox-img {
    transform: scale(1);
}

.lightbox-caption {
    color: rgba(255, 255, 255, 0.85);
    font-family: var(--font-heading);
    font-size: 1.2rem;
    margin-top: 24px;
}

/* Responsive Overrides */

/* Tablet — reduce gaps, collapse hero */
@media (max-width: 1024px) {
    .nav-menu {
        gap: 20px;
    }

    .header-container {
        padding: 0 20px;
    }

    section {
        padding: 80px 0;
    }

    .hero-content h1 {
        font-size: 3.2rem;
    }

    .contact-grid-container {
        grid-template-columns: 1fr;
        gap: 60px;
    }
}

/* Mobile — hamburger menu, stacked layouts */
@media (max-width: 768px) {
    .site-header {
        top: 12px;
        left: 12px !important;
        right: 12px !important;
        width: auto !important;
        transform: none !important;
    }

    .header-container {
        padding: 0 16px;
        height: 62px;
    }

    .site-header.scrolled .header-container {
        height: 56px;
    }

    .logo-text {
        font-size: 1.25rem;
    }

    .nav-logo {
        height: 38px;
    }

    .nav-menu {
        display: none;
    }

    .btn-contact-nav {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero-content h1 {
        font-size: 2.3rem;
        line-height: 1.2;
    }

    .hero-stats {
        gap: 24px;
        flex-wrap: wrap;
    }

    .stat-item {
        padding: 0 16px;
        border-right: none;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .feature-card {
        padding: 24px;
    }

    .teachers-grid {
        grid-template-columns: minmax(0, 320px);
        justify-content: center;
    }

    .teacher-card {
        flex-direction: column;
    }

    .teacher-image-container {
        flex: 0 0 220px;
    }

    /* Mobile QR Modal Stacking and Scaling */
    .qr-modal-wrapper {
        flex-direction: column;
        align-items: stretch;
        width: calc(100% - 32px);
        max-width: 360px;
        max-height: 90vh;
        overflow-y: auto;
        border-radius: 16px;
    }

    .qr-info-card {
        padding: 24px 20px;
        min-width: 0;
        gap: 12px;
    }

    .qr-modal-divider {
        width: 100%;
        height: 1px;
        background: rgba(0,0,0,0.07);
        align-self: stretch;
    }

    .qr-modal-card {
        padding: 24px 20px 20px;
        min-width: 0;
        gap: 12px;
    }

    .qr-modal-canvas {
        width: 180px;
        height: 180px;
    }

    .footer-container {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .form-card {
        padding: 28px 20px;
    }

    .gallery-item {
        width: 280px;
        height: 210px;
    }

    /* Responsive Gallery Slider */
    .slider-wrapper {
        margin: 0 16px;
    }

    .slider-track {
        height: 340px;
    }

    .slider-arrow {
        width: 38px;
        height: 38px;
    }

    .slider-arrow i {
        width: 18px;
        height: 18px;
    }

    .slider-arrow-left {
        left: 8px;
    }

    .slider-arrow-right {
        right: 8px;
    }

    .credit-capsule {
        display: flex !important;
        bottom: 16px;
        left: 16px !important;
        right: auto !important;
        padding: 5px;
        border-radius: 50%;
        box-shadow: 0 4px 15px rgba(15, 23, 42, 0.12);
        background: rgba(255, 255, 255, 0.92);
        backdrop-filter: blur(8px);
        -webkit-backdrop-filter: blur(8px);
    }
}

/* Small phones */
@media (max-width: 480px) {
    .site-header {
        top: 8px;
        left: 8px !important;
        right: 8px !important;
        width: auto !important;
        transform: none !important;
    }

    .header-container {
        padding: 0 14px;
        height: 56px;
    }

    .logo-text {
        font-size: 1.1rem;
    }

    .nav-logo {
        height: 34px;
    }

    .hero-content h1 {
        font-size: 1.8rem;
        letter-spacing: -0.8px;
    }

    .hero-content .lead {
        font-size: 0.95rem;
        margin-bottom: 24px;
        line-height: 1.6;
    }

    .hero-ctas {
        flex-direction: column;
        align-items: center;
        gap: 12px;
        margin-bottom: 40px;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

    .mobile-drawer {
        width: 100%;
        right: -100%;
    }

    .mobile-drawer.open {
        right: 0;
    }

    .gallery-item {
        width: 240px;
        height: 180px;
    }

    .slider-wrapper {
        margin: 0 12px;
    }

    .slider-track {
        height: 220px;
    }

    .form-card {
        padding: 24px 16px;
    }
}

/* Floating Credit Capsule */
.credit-capsule {
    position: fixed;
    bottom: 24px;
    left: 24px;
    z-index: 200;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px;
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(15, 23, 42, 0.1);
    border-radius: 100px;
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.10);
    transition: var(--transition-smooth);
}

.credit-capsule:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(15, 23, 42, 0.15);
    border-color: rgba(245, 158, 11, 0.4);
}

.credit-label {
    font-family: var(--font-heading);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-light);
    letter-spacing: 0.03em;
    white-space: nowrap;
}

.credit-logo {
    height: 32px;
    width: 32px;
    border-radius: 50%;
    object-fit: cover;
    display: block;
    border: 1.5px solid var(--accent-color);
}

/* Stream Category Header styling */
.stream-category-header {
    text-align: center;
    margin-bottom: 40px;
    margin-top: -10px;
}

.stream-category-header h3 {
    display: inline-block;
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--primary-color);
    position: relative;
    padding-bottom: 10px;
}

.stream-category-header h3::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 25%;
    width: 50%;
    height: 3px;
    background-color: var(--accent-color);
    border-radius: 10px;
}

/* Teacher Details Modal */
.teacher-modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.teacher-modal.open {
    opacity: 1;
    pointer-events: auto;
}

.teacher-modal-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(15, 23, 42, 0.4);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1;
}

.teacher-modal-content {
    background-color: var(--white);
    width: 100%;
    height: 100vh;
    max-width: 100%;
    max-height: 100%;
    border-radius: 0;
    box-shadow: none;
    border: none;
    position: relative;
    z-index: 2;
    overflow: hidden; /* Hide the main overlay scrollbar so the wrapper controls layout */
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding: 60px 40px 30px;
    box-sizing: border-box;
    transform: scale(1.02);
    opacity: 0;
    transition: transform 0.35s cubic-bezier(0.23, 1, 0.32, 1), opacity 0.35s ease;
}

.teacher-modal.open .teacher-modal-content {
    transform: scale(1);
    opacity: 1;
}

.teacher-modal-close {
    position: fixed;
    top: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--primary-color);
    transition: var(--transition-smooth);
    z-index: 100;
}

.teacher-modal-close:hover {
    background-color: var(--primary-color);
    color: var(--white);
    transform: rotate(90deg);
}

.teacher-modal-close svg {
    width: 20px;
    height: 20px;
}

.teacher-modal-body {
    padding: 0;
    width: 100%;
    max-width: 1100px;
    height: 100%;
    display: flex;
    flex-direction: column;
    margin: 0 auto;
    overflow: hidden;
}

.modal-teacher-title {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--primary-color);
    margin: 0 0 10px 0;
    text-align: center;
    letter-spacing: -0.02em;
    line-height: 1.3;
    width: 100%;
}

.modal-columns-container {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 40px;
    margin-bottom: 0;
    width: 100%;
    flex-grow: 1;
    overflow: hidden;
    align-items: stretch;
}

/* Left Column: Name + Image + Subject */
.modal-img-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 14px;
    flex-shrink: 0;
    overflow: hidden;
}

.modal-img-wrapper {
    width: 100%;
    flex-grow: 1;
    min-height: 0;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    border: 3px solid var(--white);
    box-shadow: var(--box-shadow-md);
    transition: var(--transition-smooth);
}

.modal-img-wrapper:hover {
    transform: scale(1.02);
    box-shadow: var(--box-shadow-lg);
}

.modal-teacher-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.modal-img-col .teacher-subject {
    background-color: var(--primary-color);
    color: var(--accent-color);
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    padding: 6px 18px;
    border-radius: 100px;
    box-shadow: var(--box-shadow-sm);
    text-transform: uppercase;
}

/* Right Column: Classes boxes */
.modal-classes-col {
    height: 100%;
    overflow-y: auto; /* Enable scroll specifically for classes list */
    padding-right: 12px;
}

.modal-classes-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.modal-class-box {
    background-color: var(--white);
    border: 1px solid rgba(15, 23, 42, 0.08);
    border-radius: var(--border-radius-md);
    padding: 20px 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: var(--transition-smooth);
    text-align: left;
    box-shadow: 0 4px 12px rgba(15, 23, 42, 0.02);
    border-left: 4px solid var(--primary-color);
}

.modal-class-box:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
    border-color: rgba(15, 23, 42, 0.12);
    border-left-color: var(--accent-color);
}

.class-box-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--bg-light);
    padding-bottom: 12px;
}

.class-title-badge {
    font-size: 0.9rem;
    font-weight: 800;
    color: var(--primary-color);
    background-color: rgba(15, 23, 42, 0.06);
    padding: 4px 12px;
    border-radius: 6px;
    letter-spacing: 0.02em;
}

.class-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.78rem;
    font-weight: 600;
    color: #16a34a;
    background-color: rgba(22, 163, 74, 0.08);
    padding: 4px 10px;
    border-radius: 100px;
}

.status-dot {
    width: 6px;
    height: 6px;
    background-color: #16a34a;
    border-radius: 50%;
    display: inline-block;
    animation: pulseDot 1.6s infinite;
}

@keyframes pulseDot {
    0% {
        transform: scale(0.9);
        opacity: 0.6;
    }
    50% {
        transform: scale(1.3);
        opacity: 1;
    }
    100% {
        transform: scale(0.9);
        opacity: 0.6;
    }
}

.class-box-details {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.class-detail-item {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 0.92rem;
    color: var(--text-color);
}

.class-detail-item svg {
    width: 18px;
    height: 18px;
    color: var(--text-light);
    flex-shrink: 0;
}

.detail-label {
    font-weight: 500;
    color: var(--text-light);
    min-width: 90px;
}

.detail-value {
    font-weight: 600;
    color: var(--primary-color);
}

.class-fees-item {
    border-top: 1px dashed var(--border-color);
    padding-top: 12px;
    margin-top: 4px;
}

.class-fees-item .price-tag {
    font-size: 1.15rem;
    font-weight: 800;
    color: var(--primary-color);
}

.class-fees-item svg {
    color: var(--primary-color);
}

/* Card actions row: WhatsApp button + QR icon */
.class-card-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 4px;
    position: relative;
}

/* QR icon outline button */
.btn-qr-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border: 1.5px solid var(--border-color);
    border-radius: 8px;
    background: transparent;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition-smooth);
    flex-shrink: 0;
}

.btn-qr-icon:hover {
    border-color: #25d366;
    color: #128c7e;
    background: rgba(37, 211, 102, 0.06);
}

/* QR Modal — full page centered overlay */
.qr-modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0, 0, 0, 0.55);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    align-items: center;
    justify-content: center;
}

.qr-modal-overlay.open {
    display: flex;
    animation: qrOverlayIn 0.25s ease;
}

@keyframes qrOverlayIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.qr-modal-card {
    background: #fff;
    border-radius: 0;
    padding: 28px 40px 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 14px;
    position: relative;
    box-shadow: none;
    min-width: 300px;
    animation: none;
}

@keyframes qrCardIn {
    from { opacity: 0; transform: scale(0.88) translateY(16px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}

.qr-modal-close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 1.5px solid var(--border-color);
    background: var(--bg-light);
    color: var(--text-light);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.qr-modal-close:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
    transform: rotate(90deg);
}

.qr-modal-title {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin: 0;
    text-align: center;
}

.qr-modal-canvas {
    width: 240px;
    height: 240px;
    border-radius: 12px;
    display: block;
    border: 2px solid var(--bg-light);
}

.qr-modal-link {
    display: inline-flex;
    align-items: center;
    gap: 7px;
    padding: 10px 22px;
    background: linear-gradient(135deg, #25d366 0%, #128c7e 100%);
    color: #fff;
    font-size: 0.82rem;
    font-weight: 700;
    border-radius: 100px;
    text-decoration: none;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 14px rgba(37, 211, 102, 0.3);
}

.qr-modal-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 211, 102, 0.4);
    color: #fff;
}

.qr-modal-footer {
    font-size: 0.72rem;
    color: var(--text-light);
    text-align: center;
    margin-top: 4px;
    border-top: 1px solid var(--bg-light);
    padding-top: 12px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.qr-dev-link {
    display: inline-flex;
    align-items: center;
    text-decoration: none;
}

.qr-dev-logo {
    height: 20px;
    width: auto;
    display: block;
    object-fit: contain;
    transition: opacity 0.2s ease;
}

.qr-dev-link:hover .qr-dev-logo {
    opacity: 0.8;
}

/* Small per-class WhatsApp button */
.btn-class-whatsapp {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px 16px;
    background: linear-gradient(135deg, #25d366 0%, #128c7e 100%);
    color: #fff;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    border-radius: 100px;
    text-decoration: none;
    transition: var(--transition-smooth);
    box-shadow: 0 4px 12px rgba(37, 211, 102, 0.25);
    margin-top: 4px;
    align-self: flex-start;
}

.btn-class-whatsapp:hover {
    background: linear-gradient(135deg, #22c05b 0%, #0f7c6f 100%);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(18, 140, 126, 0.35);
    color: #fff;
}

@media (max-width: 768px) {
    .teacher-modal-content {
        overflow-y: auto;
        padding: 80px 24px 40px;
    }
    .teacher-modal-body {
        height: auto;
        overflow: visible;
    }
    .modal-columns-container {
        grid-template-columns: 1fr;
        gap: 28px;
        overflow: visible;
        margin-bottom: 24px;
    }
    .modal-classes-col {
        height: auto;
        overflow-y: visible;
        padding-right: 0;
    }
    .modal-classes-container {
        grid-template-columns: 1fr; /* Stack cards vertically on mobile */
    }
    .modal-img-col {
        align-items: center;
        overflow: visible;
    }
    .modal-img-wrapper {
        max-width: 180px;
        flex-grow: 0;
        width: 180px;
        aspect-ratio: 1 / 1.1;
    }
}

/* Premium Full Screen Preloader */
.preloader-overlay {
    position: fixed;
    inset: 0;
    width: 100%;
    height: 100%;
    background-color: #0f172a; /* Sleek slate dark background to avoid FOUC */
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99999; /* Higher than everything else */
    transition: opacity 0.5s cubic-bezier(0.25, 1, 0.5, 1), visibility 0.5s;
    opacity: 1;
    visibility: visible;
}

.preloader-overlay.fade-out {
    opacity: 0;
    visibility: hidden;
}

.preloader-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

/* Stunning custom pulse/spin spinner */
.preloader-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(201, 168, 76, 0.15); /* Accent color with low opacity */
    border-top: 3px solid var(--accent-color); /* Premium gold accent color */
    border-radius: 50%;
    animation: preloader-spin 0.8s cubic-bezier(0.4, 0, 0.2, 1) infinite;
}

.preloader-text {
    font-family: var(--font-body);
    font-size: 0.95rem;
    font-weight: 600;
    color: #94a3b8;
    letter-spacing: 0.05em;
    animation: preloader-pulse 1.5s ease-in-out infinite;
    margin: 0;
}

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

@keyframes preloader-pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}