/* ============================================
   LAYOUT.CSS
   Header, Footer, Grid, Sections, and Layout
   ============================================ */

/* ============================================
   Container
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.container-sm { max-width: var(--container-sm); }
.container-md { max-width: var(--container-md); }
.container-lg { max-width: var(--container-lg); }
.container-xl { max-width: var(--container-xl); }
.container-2xl { max-width: var(--container-2xl); }
.container-fluid { max-width: 100%; }

/* ============================================
   Section Base
   ============================================ */
section {
    padding: var(--space-20) 0;
    position: relative;
}

.section-alt {
    background-color: var(--section-bg-alt);
}

/* Section Title */
.section-title {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-title h2 {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-4);
}

.section-title p {
    max-width: 600px;
    margin: 0 auto;
    color: var(--text-secondary);
}

/* Section Intro Text */
.section-intro {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--space-10);
    color: var(--text-secondary);
}

/* ============================================
   Grid Systems
   ============================================ */

/* Basic Grid */
.grid {
    display: grid;
    gap: var(--space-6);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-5 { grid-template-columns: repeat(5, 1fr); }
.grid-6 { grid-template-columns: repeat(6, 1fr); }

/* Auto-fit Grids */
.grid-auto-fit-sm {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.grid-auto-fit-md {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-auto-fit-lg {
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
}

/* Feature Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
}

/* Class Grid */
.classes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
}

/* Campus Grid */
.campuses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: var(--space-8);
}

/* Teachers Grid */
.teachers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: var(--space-6);
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

/* ============================================
   Flexbox Utilities
   ============================================ */
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.flex-col { flex-direction: column; }
.flex-row { flex-direction: row; }

.items-start { align-items: flex-start; }
.items-center { align-items: center; }
.items-end { align-items: flex-end; }
.items-stretch { align-items: stretch; }

.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.justify-around { justify-content: space-around; }

.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }
.gap-3 { gap: var(--space-3); }
.gap-4 { gap: var(--space-4); }
.gap-5 { gap: var(--space-5); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* ============================================
   Navbar / Header
   ============================================ */
.navbar {
    position: fixed;
    top: var(--space-5);
    left: var(--space-4);
    right: var(--space-4);
    z-index: var(--z-fixed);
    background: transparent;
    border-bottom: 1px solid transparent;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    top: 0;
    left: 0;
    right: 0;
    background: var(--navbar-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
    box-shadow: 0 4px 20px var(--shadow-color);
}

.navbar-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-6);
    max-width: var(--container-xl);
    margin: 0 auto;
}

/* Navbar Brand */
.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    transition: transform 0.2s ease-out;
}

.navbar-brand:hover {
    transform: scale(1.05);
}

.navbar-brand img {
    height: 40px;
    width: auto;
}

.brand-text {
    display: flex;
    flex-direction: column;
}

.brand-bn {
    font-family: 'Li Shamim Cholontika', 'Hind Siliguri', sans-serif;
    font-size: var(--fs-lg);
    font-weight: var(--fw-regular);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.3;
}

/* Navbar Menu */
.navbar-menu {
    display: flex;
    align-items: center;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.nav-links a {
    font-size: var(--fs-sm);
    font-weight: var(--fw-medium);
    color: var(--text-secondary);
    padding: var(--space-2) 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-primary);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transform-origin: center;
    transition: transform 0.3s ease-out;
}

.nav-links a:hover::after,
.nav-links a.active::after {
    transform: scaleX(1);
    transform-origin: center;
}

/* Navbar Actions */
.navbar-actions {
    display: flex;
    align-items: center;
    gap: var(--space-4);
}

/* Theme Toggle */
.theme-toggle {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--text-primary);
    font-size: var(--fs-base);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.1);
}

.light-theme .theme-toggle:hover {
    background: rgba(0, 0, 0, 0.08);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: var(--fs-xl);
    cursor: pointer;
}

/* Mobile Menu Overlay */
.mobile-menu-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease-out;
    z-index: calc(var(--z-fixed) + 1);
}

.mobile-menu-overlay.active {
    opacity: 1;
    pointer-events: auto;
}

/* Mobile Menu Sidebar */
.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 240px;
    max-width: 70vw;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    padding: var(--space-6);
    transform: translateX(100%);
    pointer-events: none;
    transition: transform 0.3s ease-out;
    z-index: calc(var(--z-fixed) + 2);
    overflow-y: auto;
}

.mobile-menu.active {
    transform: translateX(0);
    pointer-events: auto;
}

/* Mobile Menu Header */
.mobile-menu-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-8);
    padding: var(--space-4) var(--space-2);
    border-bottom: 1px solid var(--border-color);
}

.mobile-menu-header .brand-text {
    font-size: var(--fs-lg);
    font-weight: var(--fw-semibold);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.mobile-menu-close {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: var(--fs-lg);
    cursor: pointer;
    transition: background-color 0.3s ease-out;
}

.mobile-menu-close:hover {
    background: rgba(255, 255, 255, 0.1);
}

.light-theme .mobile-menu-close:hover {
    background: rgba(0, 0, 0, 0.08);
}

/* Mobile Menu Navigation */
.mobile-menu .nav-links {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-1);
}

.mobile-menu .nav-links a {
    display: flex;
    align-items: center;
    width: 100%;
    margin: var(--space-3) var(--space-2);
    font-size: var(--fs-base);
    text-align: left;
    transition: background-color 0.3s ease-out, color 0.3s ease-out;
}

/* ============================================
   Hero Section
   ============================================ */
.hero-wrapper {
    background: var(--bg-secondary);
    padding: var(--space-4) var(--space-4) 0;
}

.hero {
    min-height: calc(100vh - var(--space-4) * 2);
    display: flex;
    align-items: center;
    background: var(--hero-gradient);
    padding-top: calc(var(--navbar-height) + var(--space-8));
    position: relative;
    overflow: hidden;
    border-radius: var(--radius-xl);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        radial-gradient(circle at 20% 80%, rgba(6, 182, 212, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(236, 72, 153, 0.1) 0%, transparent 40%);
    pointer-events: none;
}

.hero-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    z-index: 1;
}

.hero-content h1 {
    font-family: 'Li Shamim Cholontika', 'Hind Siliguri', sans-serif;
    margin-bottom: var(--space-6);
}

.hero-content h1 span {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--fs-md);
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
    line-height: var(--lh-relaxed);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-buttons {
    display: flex;
    gap: var(--space-4);
    flex-wrap: wrap;
    margin-bottom: var(--space-8);
    justify-content: center;
}

.hero-campus-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--fs-sm);
    color: var(--text-muted);
}

.hero-campus-note i {
    color: var(--accent-primary);
}

/* ============================================
   About Section Layout
   ============================================ */
.about-content {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: var(--space-12);
    align-items: start;
}

.about-text p {
    margin-bottom: var(--space-5);
}

/* ============================================
   Contact Section Layout
   ============================================ */
.contact-container {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-12);
    align-items: start;
}

.contact-info h3 {
    font-size: var(--fs-xl);
    margin-bottom: var(--space-5);
    color: var(--text-primary);
}

.contact-info > p {
    color: var(--text-secondary);
    margin-bottom: var(--space-8);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.contact-form-wrapper {
    background: var(--bg-card);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border-color);
}

.contact-form-wrapper h3 {
    font-size: var(--fs-xl);
    margin-bottom: var(--space-6);
    color: var(--text-primary);
}

/* ============================================
   FAQ Section Layout
   ============================================ */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--space-16) 0 0;
}

.footer-container {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: var(--space-12);
}

/* Footer Brand */
.footer-brand .brand-bn {
    font-size: var(--fs-xl);
    font-weight: var(--fw-bold);
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-brand p {
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

/* Footer Sections */
.footer-section h4 {
    font-size: var(--fs-md);
    color: var(--text-primary);
    margin-bottom: var(--space-5);
}

.footer-links li {
    margin-bottom: var(--space-3);
}

.footer-links a {
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-address {
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    line-height: var(--lh-relaxed);
}

.footer-address i {
    color: var(--accent-primary);
    margin-right: var(--space-2);
}

.footer-address p {
    margin-bottom: var(--space-4);
}

/* Footer Bottom */
.footer-bottom {
    text-align: center;
    padding: var(--space-6) 0;
    margin-top: var(--space-12);
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: var(--fs-sm);
}

.creator-credit {
    margin-top: var(--space-2);
    font-size: var(--fs-sm);
}

.creator-link {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: var(--fw-semibold);
    position: relative;
}

.creator-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 1px;
    background: var(--accent-gradient);
    transform: scaleX(0);
    transform-origin: right center;
    transition: transform 0.3s ease-out;
}

.creator-link:hover::after {
    transform: scaleX(1);
    transform-origin: left center;
}

.creator-icon {
    font-size: 0.6rem;
    margin-left: var(--space-1);
    color: var(--text-muted);
}

/* ============================================
   Teachers Section with Slider Container
   ============================================ */
.teachers-slider-container {
    position: relative;
    overflow: hidden;
}

.teachers-slider {
    display: flex;
    gap: var(--space-6);
    transition: transform var(--transition-slow);
}

.teachers-slider .teacher-card {
    flex: 0 0 calc(25% - var(--space-5));
    min-width: 220px;
}

.slider-controls {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    margin-top: var(--space-8);
}

.slider-btn {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-size: var(--fs-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.slider-btn:hover {
    background: var(--accent-gradient);
    color: white;
    border-color: transparent;
}

.slider-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Slider Dots */
.slider-dots {
    display: flex;
    justify-content: center;
    gap: var(--space-2);
    margin-top: var(--space-6);
}

.slider-dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
    background: var(--border-color);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.slider-dot.active {
    background: var(--accent-primary);
    width: 30px;
}

/* ============================================
   Spacing Utilities
   ============================================ */
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-10 { margin-top: var(--space-10); }
.mt-12 { margin-top: var(--space-12); }

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-10 { margin-bottom: var(--space-10); }
.mb-12 { margin-bottom: var(--space-12); }

.py-4 { padding-top: var(--space-4); padding-bottom: var(--space-4); }
.py-8 { padding-top: var(--space-8); padding-bottom: var(--space-8); }
.py-12 { padding-top: var(--space-12); padding-bottom: var(--space-12); }
.py-16 { padding-top: var(--space-16); padding-bottom: var(--space-16); }
.py-20 { padding-top: var(--space-20); padding-bottom: var(--space-20); }

.px-4 { padding-left: var(--space-4); padding-right: var(--space-4); }
.px-6 { padding-left: var(--space-6); padding-right: var(--space-6); }
.px-8 { padding-left: var(--space-8); padding-right: var(--space-8); }