/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   CSS VARIABLES & THEMING
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
:root {
    /* Academic Theme Colors */
    --color-primary: #1E3A8A;       /* Deep Navy Blue - Trust, Academic */
    --color-primary-light: #2563EB;
    --color-primary-dark: #172554;
    --color-accent: #F59E0B;        /* Amber/Gold - Excellence, Friendly */
    --color-accent-hover: #D97706;
    
    --color-bg: #FFFFFF;
    --color-bg-light: #F9FAFB;      /* Off-white sections */
    --color-text-main: #1F2937;     /* Dark Gray for readability */
    --color-text-muted: #6B7280;
    --color-border: #E5E7EB;
    
    /* Typography */
    --font-heading: 'Merriweather', serif; /* Traditional, Academic */
    --font-body: 'Inter', sans-serif;      /* Modern, Clean */
    
    /* Layout */
    --container-width: 1240px;
    --section-padding: clamp(4rem, 8vw, 6rem);
    
    /* Transitions */
    --transition-fast: 0.3s ease;
    --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
}

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

html {
    scroll-behavior: smooth;
    scrollbar-width: thin;
    scrollbar-color: var(--color-primary) var(--color-bg-light);
}

body {
    font-family: var(--font-body);
    background-color: var(--color-bg);
    color: var(--color-text-main);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--color-bg-light); }
::-webkit-scrollbar-thumb { background: var(--color-primary); border-radius: 4px; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   TYPOGRAPHY & UTILITIES
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
h1, h2, h3, h4, .brand-text h1 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-primary-dark);
}

a { text-decoration: none; color: inherit; transition: var(--transition-fast); }
ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; border-radius: 8px; }

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 5%;
}

.section { padding: var(--section-padding) 0; }
.bg-light { background-color: var(--color-bg-light); }
.bg-primary { background-color: var(--color-primary); }
.bg-dark { background-color: var(--color-primary-dark); }
.text-white { color: #ffffff !important; }
.text-light { color: #E5E7EB !important; }
.text-accent { color: var(--color-accent) !important; }
.text-muted { color: var(--color-text-muted); }
.text-center { text-align: center; }
.font-bold { font-weight: 700; }
.text-small { font-size: 0.875rem; }
.mt-4 { margin-top: 1.5rem; }
.mt-5 { margin-top: 3rem; }
.ml-3 { margin-left: 1rem; }

.section-subtitle {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    margin-bottom: 1.5rem;
    position: relative;
}

.section-desc {
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto 2rem;
    font-size: 1.1rem;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   BUTTONS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.75rem;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    border: 2px solid transparent;
    transition: var(--transition-fast);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.125rem;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-primary-dark);
    border-color: var(--color-accent);
}
.btn-primary:hover {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--color-primary);
    color: var(--color-primary);
}
.btn-outline:hover {
    background-color: var(--color-primary);
    color: #fff;
}

.btn-outline-light {
    background-color: transparent;
    border-color: #fff;
    color: #fff;
}
.btn-outline-light:hover {
    background-color: #fff;
    color: var(--color-primary);
}

.btn-block { width: 100%; }

.arrow-link {
    display: inline-flex;
    align-items: center;
    font-weight: 600;
    color: var(--color-primary);
    margin-top: 1rem;
}
.arrow-link:hover { color: var(--color-accent); padding-left: 5px; }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   COMPONENTS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */

/* Preloader */
#preloader {
    position: fixed; inset: 0;
    background-color: var(--color-bg);
    display: flex; justify-content: center; align-items: center;
    z-index: 9999; transition: opacity 0.5s ease;
}
.loader-content { text-align: center; color: var(--color-primary); }
.loader-icon svg {
    width: 60px; height: 60px; margin-bottom: 1rem;
    animation: bounce 2s infinite ease-in-out;
}
@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

/* Scroll Progress */
#scroll-progress {
    position: fixed; top: 0; left: 0; height: 4px;
    background-color: var(--color-accent);
    width: 0%; z-index: 10000;
}

/* Top Notice Bar */
.top-bar {
    background-color: var(--color-primary-dark);
    color: #fff; padding: 8px 0; font-size: 0.85rem;
}
.top-bar-container {
    display: flex; justify-content: space-between; align-items: center;
}
.admission-status {
    display: flex; align-items: center; gap: 8px; font-weight: 600; color: var(--color-accent);
}
.pulse-dot {
    width: 8px; height: 8px; background-color: var(--color-accent);
    border-radius: 50%; animation: pulse 1.5s infinite;
}
@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(245, 158, 11, 0.7); }
    70% { box-shadow: 0 0 0 6px rgba(245, 158, 11, 0); }
    100% { box-shadow: 0 0 0 0 rgba(245, 158, 11, 0); }
}
.notice-ticker {
    flex-grow: 1; margin: 0 2rem; overflow: hidden; white-space: nowrap;
}
.ticker-content {
    display: inline-block;
    animation: ticker 25s linear infinite;
}
.ticker-content span { margin-right: 3rem; }
@keyframes ticker {
    0% { transform: translateX(100%); }
    100% { transform: translateX(-100%); }
}
.top-links a { margin-left: 1.5rem; font-weight: 500; }
.top-links a:hover { color: var(--color-accent); }

/* Header & Navigation */
header {
    position: sticky; top: 0; width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow-sm);
    z-index: 1000; transition: padding 0.3s ease;
    padding: 1rem 0;
}
header.scrolled { padding: 0.5rem 0; box-shadow: var(--shadow-md); }
.nav-container { display: flex; justify-content: space-between; align-items: center; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-icon svg { width: 40px; height: 40px; color: var(--color-primary); }
.brand-text h1 { font-size: 1.4rem; margin: 0; color: var(--color-primary-dark); }
.brand-text span { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 1px; color: var(--color-text-muted); font-weight: 600; }

.nav-list { display: flex; gap: 2rem; align-items: center; }
.nav-link {
    font-size: 0.95rem; font-weight: 600; color: var(--color-text-main); position: relative;
}
.nav-link::after {
    content: ''; position: absolute; bottom: -4px; left: 0; width: 0%; height: 2px;
    background-color: var(--color-primary); transition: var(--transition-fast);
}
.nav-link:hover, .nav-link.active { color: var(--color-primary); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }

.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.hamburger .bar { width: 25px; height: 2px; background-color: var(--color-primary-dark); transition: var(--transition-fast); }

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   SECTIONS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */

/* Hero Section */
.hero {
    height: calc(100vh - 120px); min-height: 600px;
    position: relative; display: flex; align-items: center;
}
.hero-bg { position: absolute; inset: 0; z-index: -1; overflow: hidden; }
.hero-bg img { width: 100%; height: 100%; object-fit: cover; border-radius: 0; }
.hero-overlay {
    position: absolute; inset: 0;
    background: linear-gradient(90deg, rgba(23, 37, 84, 0.9) 0%, rgba(30, 58, 138, 0.7) 50%, rgba(255,255,255,0) 100%);
}
.hero-content { position: relative; z-index: 1; max-width: 700px; color: #fff; }
.hero-badge {
    display: inline-block; padding: 6px 12px; background-color: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2); border-radius: 20px; font-size: 0.85rem; font-weight: 500; margin-bottom: 1.5rem;
}
.hero-title { font-size: clamp(2.5rem, 5vw, 4.5rem); color: #fff; margin-bottom: 1.5rem; }
.hero-desc { font-size: 1.15rem; color: #E5E7EB; margin-bottom: 2.5rem; max-width: 550px; line-height: 1.8; }
.hero-actions { display: flex; gap: 1rem; }

/* Quick Access Cards */
.quick-access { margin-top: -60px; position: relative; z-index: 10; padding-bottom: 3rem; }
.access-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.access-card {
    background-color: var(--color-bg); padding: 2rem; border-radius: 12px;
    box-shadow: var(--shadow-lg); transition: var(--transition-fast);
    border-top: 4px solid var(--color-primary);
}
.access-card:hover { transform: translateY(-5px); }
.access-card.bg-primary { border-top-color: var(--color-accent); }
.card-icon { width: 40px; height: 40px; color: var(--color-primary); margin-bottom: 1rem; }
.access-card.bg-primary .card-icon { color: var(--color-accent); }
.access-card h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }
.access-card p { color: var(--color-text-muted); font-size: 0.95rem; line-height: 1.5; }

/* About & Notice Board */
.about-grid { display: grid; grid-template-columns: 1.5fr 1fr; gap: 4rem; }
.principal-content { display: flex; gap: 2rem; margin-top: 2rem; }
.principal-img { flex-shrink: 0; width: 150px; }
.principal-img img { border-radius: 8px; box-shadow: var(--shadow-md); }
.principal-text p { font-style: italic; font-size: 1.1rem; color: var(--color-text-muted); }
.principal-text h4 { margin-bottom: 0; color: var(--color-primary-dark); }

.notice-board {
    background-color: var(--color-bg); border-radius: 12px; box-shadow: var(--shadow-md); overflow: hidden; border: 1px solid var(--color-border);
}
.notice-header {
    background-color: var(--color-primary); color: #fff; padding: 1.5rem;
    display: flex; justify-content: space-between; align-items: center;
}
.notice-header h3 { color: #fff; margin: 0; display: flex; align-items: center; gap: 10px; font-size: 1.25rem; }
.notice-header svg { width: 20px; height: 20px; }
.view-all { font-size: 0.85rem; color: var(--color-accent); font-weight: 600; }
.notice-list { list-style: none; padding: 0; margin: 0; }
.notice-list li {
    display: flex; gap: 1.5rem; padding: 1.5rem; border-bottom: 1px solid var(--color-border); transition: var(--transition-fast);
}
.notice-list li:hover { background-color: var(--color-bg-light); }
.notice-list li:last-child { border-bottom: none; }
.notice-date {
    display: flex; flex-direction: column; align-items: center; justify-content: center;
    background-color: var(--color-bg-light); padding: 10px; border-radius: 8px; min-width: 60px; border: 1px solid var(--color-border);
}
.day { font-size: 1.25rem; font-weight: 700; color: var(--color-primary); line-height: 1; }
.month { font-size: 0.75rem; font-weight: 600; color: var(--color-text-muted); }
.notice-info a { display: block; font-weight: 600; margin-bottom: 8px; color: var(--color-text-main); }
.notice-info a:hover { color: var(--color-primary); }
.notice-tag {
    display: inline-block; padding: 3px 8px; border-radius: 4px; font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
}
.tag-event { background-color: #FEF3C7; color: #D97706; }
.tag-academic { background-color: #DBEAFE; color: #1D4ED8; }
.tag-admin { background-color: #F3F4F6; color: #4B5563; }

/* Academics */
.academics-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.academic-card {
    background-color: var(--color-bg); border-radius: 12px; overflow: hidden;
    box-shadow: var(--shadow-sm); transition: var(--transition-fast);
    border: 1px solid var(--color-border);
}
.academic-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.academic-img { height: 200px; width: 100%; object-fit: cover; border-radius: 12px 12px 0 0; }
.academic-content { padding: 1.5rem; }
.academic-content h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }
.academic-content p { color: var(--color-text-muted); font-size: 0.95rem; }

/* Stats Counter */
.stats { padding: 4rem 0; }
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); text-align: center; gap: 2rem; }
.stat-item { padding: 1rem; }
.stat-number { font-family: var(--font-heading); font-size: 3.5rem; font-weight: 900; color: var(--color-accent); line-height: 1; }
.stat-plus { font-family: var(--font-heading); font-size: 2.5rem; font-weight: 700; color: var(--color-accent); }
.stat-label { font-size: 1rem; font-weight: 500; margin-top: 0.5rem; letter-spacing: 1px; }

/* Facilities */
.facilities-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.facility-item {
    background-color: var(--color-bg); padding: 2rem; border-radius: 12px;
    text-align: center; border: 1px solid var(--color-border); transition: var(--transition-fast);
}
.facility-item:hover { border-color: var(--color-primary-light); box-shadow: var(--shadow-md); }
.facility-icon {
    width: 60px; height: 60px; margin: 0 auto 1.5rem; background-color: var(--color-bg-light);
    border-radius: 50%; display: flex; justify-content: center; align-items: center; color: var(--color-primary);
}
.facility-icon svg { width: 30px; height: 30px; }
.facility-item h4 { font-size: 1.125rem; margin-bottom: 0.75rem; }
.facility-item p { font-size: 0.9rem; color: var(--color-text-muted); }

/* Admissions Timeline */
.timeline { position: relative; max-width: 800px; margin: 3rem auto 0; }
.timeline::before {
    content: ''; position: absolute; left: 24px; top: 0; bottom: 0;
    width: 2px; background-color: var(--color-border);
}
.timeline-item { position: relative; margin-bottom: 2.5rem; padding-left: 70px; }
.timeline-item:last-child { margin-bottom: 0; }
.timeline-dot {
    position: absolute; left: 0; top: 0; width: 50px; height: 50px;
    background-color: var(--color-primary); color: var(--color-accent);
    border-radius: 50%; display: flex; justify-content: center; align-items: center;
    font-family: var(--font-heading); font-size: 1.25rem; font-weight: 700;
    border: 4px solid var(--color-bg); box-shadow: var(--shadow-sm);
}
.timeline-content { background-color: var(--color-bg-light); padding: 1.5rem; border-radius: 8px; border: 1px solid var(--color-border); }
.timeline-content h4 { font-size: 1.125rem; margin-bottom: 0.5rem; }
.timeline-content p { color: var(--color-text-muted); font-size: 0.95rem; margin: 0; }

/* Contact Section */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; }
.info-blocks { margin-top: 2rem; display: flex; flex-direction: column; gap: 1.5rem; }
.info-item { display: flex; gap: 1rem; align-items: flex-start; }
.info-icon {
    background-color: var(--color-primary); color: #fff; width: 40px; height: 40px;
    border-radius: 8px; display: flex; justify-content: center; align-items: center; flex-shrink: 0;
}
.info-icon svg { width: 20px; height: 20px; }
.info-item h4 { font-size: 1rem; margin-bottom: 0.25rem; color: var(--color-primary-dark); }
.info-item p { font-size: 0.95rem; color: var(--color-text-muted); }
.hover-link:hover { color: var(--color-primary); text-decoration: underline; }

.contact-form {
    background-color: var(--color-bg); padding: 2.5rem; border-radius: 12px; box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
}
.contact-form h3 { margin-bottom: 1.5rem; font-size: 1.5rem; }
.input-row { display: flex; gap: 1rem; }
.input-group { margin-bottom: 1.25rem; width: 100%; }
.input-group label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--color-text-main); }
input, select, textarea {
    width: 100%; padding: 0.75rem 1rem; border: 1px solid var(--color-border);
    border-radius: 6px; font-family: var(--font-body); font-size: 1rem;
    transition: var(--transition-fast); background-color: var(--color-bg-light);
}
input:focus, select:focus, textarea:focus { outline: none; border-color: var(--color-primary); background-color: var(--color-bg); }

/* Footer */
.footer { padding: 4rem 0 1rem; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem; }
.footer-links h4 { color: var(--color-accent); margin-bottom: 1.5rem; font-size: 1.1rem; }
.link-column ul { display: flex; flex-direction: column; gap: 0.75rem; }
.link-column a { color: #E5E7EB; font-size: 0.9rem; }
.link-column a:hover { color: var(--color-accent); }
.footer-bottom {
    display: flex; justify-content: space-between; align-items: center;
    padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,0.1); font-size: 0.85rem; color: #9CA3AF;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   ANIMATIONS & FLOATERS
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
/* Reveal Animations */
.reveal-up { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal-left { opacity: 0; transform: translateX(-30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal-right { opacity: 0; transform: translateX(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal-up.active, .reveal-left.active, .reveal-right.active { opacity: 1; transform: translate(0); }
.delay-1 { transition-delay: 0.15s; }
.delay-2 { transition-delay: 0.3s; }
.delay-3 { transition-delay: 0.45s; }

/* WhatsApp */
.whatsapp-float {
    position: fixed; bottom: 2rem; right: 2rem; background-color: #25D366; color: #FFF;
    width: 60px; height: 60px; border-radius: 50%; display: flex; justify-content: center; align-items: center;
    box-shadow: var(--shadow-lg); z-index: 999; transition: var(--transition-fast);
}
.whatsapp-float::before {
    content: ''; position: absolute; inset: -4px; border-radius: 50%; border: 2px solid #25D366;
    animation: pulse-wa 2s infinite;
}
@keyframes pulse-wa { 0% { transform: scale(1); opacity: 1; } 100% { transform: scale(1.3); opacity: 0; } }
.whatsapp-float:hover { transform: scale(1.1); }

/* Back to Top */
.back-to-top {
    position: fixed; bottom: 2rem; left: 2rem; background-color: var(--color-bg); color: var(--color-primary);
    border: 1px solid var(--color-primary); width: 45px; height: 45px; border-radius: 50%;
    display: flex; justify-content: center; align-items: center; cursor: pointer;
    z-index: 999; opacity: 0; visibility: hidden; transition: var(--transition-fast);
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background-color: var(--color-primary); color: #fff; }

/* Mobile Bottom CTA */
.mobile-bottom-cta {
    display: none; position: fixed; bottom: 0; left: 0; width: 100%;
    z-index: 998; box-shadow: 0 -2px 10px rgba(0,0,0,0.1);
}
.mobile-cta-btn {
    flex: 1; display: flex; justify-content: center; align-items: center; gap: 8px;
    padding: 1rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; font-size: 0.9rem;
}

/* ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   RESPONSIVE (Mobile First approach applied via max-width)
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ */
@media (max-width: 1024px) {
    .access-grid, .academics-grid, .facilities-grid { grid-template-columns: repeat(2, 1fr); }
    .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 3rem; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 3rem; }
    .footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .top-bar { display: none; } /* Hide ticker on mobile to save space */
    .nav-cta { display: none; }
    .hamburger { display: flex; }
    
    .nav-menu {
        position: fixed; top: 70px; left: -100%; width: 100%; height: calc(100vh - 70px);
        background-color: var(--color-bg); flex-direction: column; justify-content: flex-start;
        padding-top: 2rem; transition: left 0.3s ease; box-shadow: var(--shadow-md);
    }
    .nav-menu.active { left: 0; }
    .nav-list { flex-direction: column; align-items: center; width: 100%; gap: 1.5rem; }
    .nav-link { font-size: 1.25rem; }
    
    .hamburger.active .bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
    .hamburger.active .bar:nth-child(2) { opacity: 0; }
    .hamburger.active .bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
    
    .hero { height: auto; padding: 120px 0 80px; }
    .hero-title { font-size: 2.5rem; }
    .hero-actions { flex-direction: column; }
    .btn-large { width: 100%; }
    
    .quick-access { margin-top: 2rem; }
    .access-grid, .academics-grid, .facilities-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
    
    .principal-content { flex-direction: column; text-align: center; align-items: center; }
    .input-row { flex-direction: column; gap: 0; }
    
    .footer-top { grid-template-columns: 1fr; gap: 2rem; text-align: center; }
    .footer-bottom { flex-direction: column; gap: 1rem; text-align: center; padding-bottom: 70px; }
    
    /* Enable Mobile CTA */
    .mobile-bottom-cta { display: flex; }
    .whatsapp-float { bottom: 80px; right: 1rem; width: 50px; height: 50px; }
    .back-to-top { display: none !important; } /* Hide back to top on mobile */
}