/* General Setup */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

html, body {
    overflow-x: hidden;
    max-width: 100vw;
}

body {
    background-color: #0f172a;
    color: #f8fafc;
    line-height: 1.6;
}

/* Prevent horizontal overflow on all main containers */
section, .container, .hero-container, .mentor-container, .howto-grid, 
.services-grid, .gallery-grid, .videos-layout, .bangla-social-grid,
.quiz-selection, .mentor-photo-wrap {
    max-width: 100%;
    overflow-x: hidden;
}

/* Header & Nav */
/* Professional header entrance animation */
@keyframes slideDownHeader {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

header {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 18px 8%;
    background: linear-gradient(180deg, rgba(30, 41, 59, 0.96) 0%, rgba(15, 23, 42, 0.94) 100%);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 1000;
    animation: slideDownHeader 0.7s ease forwards;
    box-shadow: 0 4px 18px rgba(0, 0, 0, 0.35);
    border-bottom: 1px solid rgba(56, 189, 248, 0.16);
}

/* Header layout: logo left, menu centered, hamburger right */
.logo {
    grid-column: 1;
    justify-self: start;
    font-size: 1.5rem;
    font-weight: 700;
}

/* Glassy pill menu bar, centered */
nav#navMenu {
    grid-column: 2;
    justify-self: center;
    background: rgba(15, 23, 42, 0.55);
    border: 1px solid rgba(255, 255, 255, 0.07);
    border-radius: 40px;
    padding: 6px 10px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    animation: navPulse 4s ease-in-out infinite;
}

@keyframes navPulse {
    0%, 100% {
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.35), 0 0 0 1px rgba(56, 189, 248, 0.05), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    }
    50% {
        box-shadow: 0 6px 26px rgba(56, 189, 248, 0.18), 0 0 0 1px rgba(56, 189, 248, 0.18), inset 0 1px 0 rgba(255, 255, 255, 0.05);
    }
}

.logo span {
    color: #38bdf8;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 4px;
}

/* Individual link entrance stagger */
@keyframes fadeInUpLink {
    from {
        opacity: 0;
        transform: translateY(12px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

nav ul li {
    opacity: 0;
    animation: fadeInUpLink 0.6s ease forwards;
}

nav ul li:nth-child(1) { animation-delay: 0.10s; }
nav ul li:nth-child(2) { animation-delay: 0.16s; }
nav ul li:nth-child(3) { animation-delay: 0.22s; }
nav ul li:nth-child(4) { animation-delay: 0.28s; }
nav ul li:nth-child(5) { animation-delay: 0.34s; }
nav ul li:nth-child(6) { animation-delay: 0.40s; }
nav ul li:nth-child(7) { animation-delay: 0.46s; }
nav ul li:nth-child(8) { animation-delay: 0.52s; }

/* Animated pill-style links */
nav a {
    display: inline-block;
    padding: 9px 16px;
    border-radius: 30px;
    color: #cbd5e1;
    text-decoration: none;
    font-family: 'Poppins', 'Segoe UI', Tahoma, sans-serif;
    font-size: 0.86rem;
    font-weight: 500;
    letter-spacing: 0.5px;
    text-transform: uppercase;
    position: relative;
    transition: color 0.3s ease, background 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease, text-shadow 0.3s ease;
}

nav a::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: 6px;
    width: 0;
    height: 2px;
    background: #38bdf8;
    border-radius: 2px;
    transform: translateX(-50%);
    box-shadow: 0 0 8px rgba(56, 189, 248, 0.6);
    transition: width 0.35s ease;
}

nav a:hover {
    color: #ffffff;
    background: rgba(56, 189, 248, 0.16);
    box-shadow: inset 0 0 0 1px rgba(56, 189, 248, 0.35);
    transform: translateY(-2px);
}

nav a:hover::after {
    width: 60%;
}

nav a.active-link {
    color: #ffffff;
    background: linear-gradient(135deg, #0ea5e9, #0284c7);
    box-shadow: 0 6px 14px rgba(2, 132, 199, 0.3), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

nav a.active-link::after {
    width: 0;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 10px;
    color: inherit;
    text-decoration: none;
}

/* ==========================================
   NAV DROPDOWN MENU
   ========================================== */
.nav-dropdown {
    position: relative;
}

.nav-dropdown > .nav-link i {
    font-size: 0.65rem;
    margin-left: 4px;
    transition: transform 0.3s ease;
}

.nav-dropdown:hover > .nav-link i,
.nav-dropdown.dropdown-open > .nav-link i {
    transform: rotate(180deg);
}

/* Invisible bridge between link and dropdown so mouse doesn't lose hover */
.nav-dropdown::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    height: 12px;
}

.dropdown-menu {
    position: absolute;
    top: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%) translateY(6px);
    min-width: 200px;
    background: #1e293b;
    border: 1px solid rgba(56, 189, 248, 0.2);
    border-radius: 12px;
    padding: 8px 0;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s ease;
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.45);
    z-index: 1001;
}

.dropdown-menu::before {
    content: "";
    position: absolute;
    top: -6px;
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
    width: 12px;
    height: 12px;
    background: #1e293b;
    border-left: 1px solid rgba(56, 189, 248, 0.2);
    border-top: 1px solid rgba(56, 189, 248, 0.2);
}

.nav-dropdown:hover > .dropdown-menu,
.nav-dropdown.dropdown-open > .dropdown-menu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

.dropdown-menu li {
    list-style: none;
}

.dropdown-menu li a {
    display: block;
    padding: 10px 18px;
    color: #cbd5e1;
    text-decoration: none;
    font-family: 'Poppins', 'Segoe UI', Tahoma, sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color 0.2s ease, background 0.2s ease;
    display: flex;
    align-items: center;
    gap: 8px;
}

.dropdown-menu li a i {
    font-size: 0.8rem;
    width: 16px;
    text-align: center;
}

.dropdown-menu li a:hover {
    color: #ffffff;
    background: rgba(56, 189, 248, 0.12);
}

/* Hero Section */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: left;
    padding: 80px 8%;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: url('image/periodictable.png') center/cover no-repeat;
    background-size: auto 120%;
    opacity: 0.45;
    z-index: 0;
}

.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.85) 0%, rgba(30, 41, 59, 0.75) 100%);
    z-index: 1;
}

.hero-container {
    position: relative;
    z-index: 2;
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 50px;
    align-items: center;
    max-width: 1200px;
    width: 100%;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(56, 189, 248, 0.12);
    border: 1px solid rgba(56, 189, 248, 0.35);
    color: #38bdf8;
    font-size: 0.85rem;
    font-weight: 600;
    padding: 8px 16px;
    border-radius: 30px;
    margin-bottom: 22px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.hero h1 {
    font-size: 2.8rem;
    line-height: 1.2;
    margin-bottom: 18px;
}

.highlight {
    color: #38bdf8;
    text-shadow: 0 0 30px rgba(56, 189, 248, 0.35);
}

.hero p {
    font-size: 1.15rem;
    color: #94a3b8;
    max-width: 560px;
    margin: 0 0 30px 0;
}

.hero-stats {
    display: flex;
    gap: 14px;
    margin-top: 34px;
    flex-wrap: wrap;
}

.hero-btns {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.hero-stat {
    background: rgba(30, 41, 59, 0.7);
    border: 1px solid #334155;
    border-radius: 10px;
    padding: 14px 22px;
    text-align: center;
    min-width: 110px;
    transition: transform 0.3s, border-color 0.3s;
}

.hero-stat:hover {
    transform: translateY(-4px);
    border-color: #38bdf8;
}

.hero-stat .stat-num {
    display: block;
    font-size: 1.6rem;
    font-weight: 700;
    color: #38bdf8;
}

.hero-stat .stat-label {
    font-size: 0.8rem;
    color: #94a3b8;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    background: #38bdf8;
    color: #0f172a;
    text-decoration: none;
    font-weight: 600;
    border-radius: 8px;
    transition: background 0.3s, transform 0.3s, box-shadow 0.3s;
}

.btn:hover {
    background: #0284c7;
    color: #ffffff;
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(56, 189, 248, 0.3);
}

/* Hero demo quiz card */
.hero-demo {
    position: relative;
    z-index: 2;
}

.demo-card {
    background: rgba(30, 41, 59, 0.85);
    border: 1px solid rgba(56, 189, 248, 0.25);
    border-radius: 16px;
    padding: 22px;
    backdrop-filter: blur(6px);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.45);
    animation: floatCard 6s ease-in-out infinite;
}

@keyframes floatCard {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-12px); }
}

.demo-card-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 18px;
}

.demo-tag {
    background: rgba(56, 189, 248, 0.15);
    color: #38bdf8;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 6px 12px;
    border-radius: 20px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.demo-timer {
    color: #f87171;
    font-family: 'Courier New', monospace;
    font-weight: 700;
    font-size: 0.95rem;
}

.demo-qtext {
    font-size: 1.05rem;
    color: #f8fafc;
    font-weight: 600;
    margin-bottom: 16px;
    min-height: 48px;
}

.demo-options {
    display: grid;
    gap: 10px;
    margin-bottom: 14px;
}

.demo-option {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 14px;
    background: #0f172a;
    border: 2px solid #334155;
    border-radius: 8px;
    color: #e2e8f0;
    font-size: 0.92rem;
    text-align: left;
    cursor: default;
    transition: border-color 0.3s, background 0.3s, transform 0.2s;
}

.demo-option .demo-idx {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    background: #334155;
    color: #f8fafc;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.8rem;
    flex-shrink: 0;
}

.demo-option .opt-text {
    flex: 1;
}

.demo-option.demo-wrong {
    border-color: #f87171;
    background: rgba(248, 113, 113, 0.12);
    animation: shakeX 0.4s ease;
}

.demo-option.demo-right {
    border-color: #22c55e;
    background: rgba(34, 197, 94, 0.15);
    box-shadow: 0 0 18px rgba(34, 197, 94, 0.35);
    transform: scale(1.02);
}

@keyframes shakeX {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

.demo-feedback {
    font-size: 0.85rem;
    color: #94a3b8;
    text-align: center;
    min-height: 20px;
    transition: color 0.3s;
}

.demo-feedback.demo-feedback-right {
    color: #22c55e;
    font-weight: 600;
}

.demo-progress {
    height: 6px;
    background: #0f172a;
    border-radius: 3px;
    overflow: hidden;
    margin-top: 12px;
}

.demo-progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, #38bdf8, #22c55e);
    border-radius: 3px;
    transition: width 0.3s ease;
}

.secondary-btn {
    background: transparent;
    border: 2px solid #38bdf8;
    color: #38bdf8;
}

.secondary-btn:hover {
    background: #38bdf8;
    color: #0f172a;
}

/* ==========================================
   HOW TO USE THIS WEBSITE SECTION
   ========================================== */
.howto-section {
    padding: 70px 8%;
    text-align: center;
    background:
        radial-gradient(ellipse at 20% 30%, rgba(56, 189, 248, 0.07), transparent 55%),
        radial-gradient(ellipse at 80% 70%, rgba(250, 204, 21, 0.06), transparent 55%),
        #0f172a;
}

.howto-badge {
    display: inline-block;
    padding: 6px 18px;
    border-radius: 20px;
    background: rgba(56, 189, 248, 0.12);
    color: #38bdf8;
    font-size: 0.88rem;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 14px;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.howto-section h2 {
    font-size: 2rem;
    color: #f8fafc;
    margin-bottom: 12px;
    font-family: 'Outfit', 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.howto-section h2 .highlight {
    background: linear-gradient(135deg, #38bdf8, #0284c7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.howto-subtitle {
    color: #94a3b8;
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto 40px;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.howto-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    max-width: 1200px;
    margin: 0 auto;
}

.howto-card {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 16px;
    padding: 30px 24px;
    text-align: left;
    transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
    opacity: 0;
    transform: translateY(30px);
}

.howto-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.howto-card:nth-child(2).visible { transition-delay: 0.12s; }
.howto-card:nth-child(3).visible { transition-delay: 0.24s; }
.howto-card:nth-child(4).visible { transition-delay: 0.36s; }

.howto-card:hover {
    transform: translateY(-6px);
    border-color: rgba(56, 189, 248, 0.3);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.howto-icon-wrap {
    width: 56px;
    height: 56px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 18px;
}

.howto-icon-wrap.cyan {
    background: rgba(56, 189, 248, 0.15);
    color: #38bdf8;
}

.howto-icon-wrap.green {
    background: rgba(34, 197, 94, 0.15);
    color: #22c55e;
}

.howto-icon-wrap.amber {
    background: rgba(250, 204, 21, 0.15);
    color: #facc15;
}

.howto-icon-wrap.pink {
    background: rgba(244, 114, 182, 0.15);
    color: #f472b6;
}

.howto-card h3 {
    color: #f8fafc;
    font-size: 1.15rem;
    margin-bottom: 10px;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.howto-card p {
    color: #94a3b8;
    font-size: 0.92rem;
    line-height: 1.6;
    margin-bottom: 16px;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.howto-list {
    list-style: none;
    padding: 0;
    margin: 0 0 20px 0;
}

.howto-list li {
    color: #cbd5e1;
    font-size: 0.88rem;
    padding: 5px 0;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.howto-list li i {
    color: #22c55e;
    margin-right: 8px;
    font-size: 0.75rem;
}

.howto-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #38bdf8;
    text-decoration: none;
    font-size: 0.92rem;
    font-weight: 600;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
    transition: gap 0.3s ease, color 0.3s ease;
}

.howto-link:hover {
    gap: 10px;
    color: #7dd3fc;
}

/* How-to section responsive */
@media (max-width: 1024px) {
    .howto-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .howto-section {
        padding: 50px 5%;
    }

    .howto-section h2 {
        font-size: 1.5rem;
    }

    .howto-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .howto-card {
        padding: 24px 20px;
    }
}

/* Meet Your Mentor Section */
.mentor-section {
    padding: 70px 8%;
    text-align: center;
    background:
        radial-gradient(ellipse at 15% 20%, rgba(56, 189, 248, 0.08), transparent 55%),
        radial-gradient(ellipse at 85% 80%, rgba(34, 197, 94, 0.07), transparent 55%),
        #0f172a;
}

.mentor-container {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 55px;
    align-items: center;
    max-width: 1100px;
    margin: 0 auto;
    text-align: left;
}

.mentor-photo-wrap {
    position: relative;
}

.mentor-photo {
    position: relative;
    border-radius: 18px;
    overflow: hidden;
    border: 2px solid #38bdf8;
    box-shadow: 0 0 45px rgba(56, 189, 248, 0.28);
    animation: mentorFloat 5s ease-in-out infinite;
    aspect-ratio: 1 / 1;
}

.mentor-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    display: block;
    transition: transform 0.5s ease;
}

.mentor-photo:hover img {
    transform: scale(1.04);
}

@keyframes mentorFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.mentor-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 18px;
    justify-content: center;
}

.mentor-chip {
    background: #1e293b;
    border: 1px solid #334155;
    color: #cbd5e1;
    font-size: 0.82rem;
    padding: 7px 13px;
    border-radius: 30px;
    display: inline-flex;
    align-items: center;
    gap: 7px;
    transition: border-color 0.3s, transform 0.3s;
}

.mentor-chip i {
    color: #38bdf8;
}

.mentor-chip.verified {
    border-color: #22c55e;
}

.mentor-chip.verified i {
    color: #22c55e;
}

.mentor-chip:hover {
    border-color: #38bdf8;
    transform: translateY(-2px);
}

.mentor-info .mentor-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(56, 189, 248, 0.12);
    border: 1px solid rgba(56, 189, 248, 0.4);
    color: #38bdf8;
    padding: 7px 16px;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 18px;
}

.mentor-info .remian-badge {
    background: linear-gradient(135deg, #0f172a, #1e293b);
    border: 2px solid #38bdf8;
    color: #ffffff;
    margin-top: 10px;
    margin-bottom: 18px;
    font-size: 1rem;
    font-weight: 600;
    padding: 10px 20px;
}

.mentor-info .remian-badge i {
    color: #38bdf8;
    font-size: 1.1rem;
}

.mentor-info .remian-highlight {
    background: linear-gradient(135deg, #38bdf8, #0ea5e9);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
}

.mentor-info .drmc-highlight {
    color: #facc15;
    font-weight: 700;
}

.mentor-info h2 {
    font-size: 2.3rem;
    color: #f8fafc;
    margin-bottom: 6px;
}

.mentor-info h3 {
    color: #38bdf8;
    font-size: 1.15rem;
    margin-bottom: 16px;
}

.mentor-info p {
    color: #94a3b8;
    line-height: 1.7;
    margin-bottom: 18px;
}

.mentor-features {
    list-style: none;
    padding: 0;
    margin: 0 0 24px 0;
}

.mentor-features li {
    color: #cbd5e1;
    font-size: 1rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.mentor-features i {
    color: #22c55e;
    font-size: 1.05rem;
}

.mentor-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 14px;
}

/* Gallery Section */
.gallery-section {
    padding: 60px 8%;
    text-align: center;
}

.gallery-section h2 {
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.subtitle {
    color: #94a3b8;
    margin-bottom: 30px;
}

/* About role badges */
.about-roles {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    justify-content: center;
    margin-bottom: 34px;
}

.about-role {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 9px 18px;
    border-radius: 30px;
    font-size: 0.9rem;
    font-weight: 600;
    background: #1e293b;
    border: 1px solid #334155;
    color: #f8fafc;
    transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.about-role:hover {
    transform: translateY(-3px);
}

.about-role.student {
    border-color: #22c55e;
}

.about-role.student i {
    color: #22c55e;
}

.about-role.mentor {
    border-color: #38bdf8;
}

.about-role.mentor i {
    color: #38bdf8;
}

.about-role.ceo {
    border-color: #f59e0b;
}

.about-role.ceo i {
    color: #f59e0b;
}

.about-role.academy {
    border-color: #a78bfa;
}

.about-role.academy i {
    color: #a78bfa;
}

/* Upload Box */
.upload-box {
    background: #1e293b;
    padding: 25px;
    border-radius: 12px;
    max-width: 600px;
    margin: 0 auto 40px auto;
    border: 1px dashed #38bdf8;
}

.upload-box h3 {
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.form-group input {
    padding: 12px;
    border-radius: 6px;
    border: 1px solid #334155;
    background: #0f172a;
    color: #fff;
}

.btn-add {
    padding: 12px;
    background: #22c55e;
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s;
}

.btn-add:hover {
    background: #16a34a;
}

/* Bento gallery grid */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-auto-rows: 220px;
    gap: 18px;
    margin-top: 30px;
}

.gallery-card {
    position: relative;
    overflow: hidden;
    border-radius: 14px;
    border: 1px solid #334155;
    cursor: pointer;
    background: #1e293b;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s, box-shadow 0.3s;
}

.gallery-card.featured {
    grid-column: span 2;
    grid-row: span 2;
}

.gallery-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 30px rgba(56, 189, 248, 0.2);
}

.gallery-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.6s ease;
}

.gallery-card:hover img {
    transform: scale(1.08);
}

.gallery-card::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(15, 23, 42, 0.85) 0%, rgba(15, 23, 42, 0) 55%);
    opacity: 0;
    transition: opacity 0.4s;
}

.gallery-card:hover::after {
    opacity: 1;
}

.gallery-tag {
    position: absolute;
    top: 14px;
    left: 14px;
    z-index: 2;
    background: rgba(56, 189, 248, 0.14);
    border: 1px solid #38bdf8;
    color: #38bdf8;
    font-size: 0.8rem;
    font-weight: 600;
    padding: 6px 13px;
    border-radius: 30px;
    letter-spacing: 0.4px;
}

.card-zoom {
    position: absolute;
    top: 14px;
    right: 14px;
    width: 40px;
    height: 40px;
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid #38bdf8;
    color: #38bdf8;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
    opacity: 0;
    transform: scale(0.6);
    transition: opacity 0.3s, transform 0.3s;
}

.gallery-card:hover .card-zoom {
    opacity: 1;
    transform: scale(1);
}

.card-info {
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 18px;
    text-align: left;
    z-index: 2;
    background: linear-gradient(to top, rgba(2, 6, 23, 0.95) 0%, rgba(2, 6, 23, 0) 100%);
    transform: translateY(100%);
    transition: transform 0.4s ease;
}

.gallery-card:hover .card-info,
.gallery-card.featured .card-info {
    transform: translateY(0);
}

.card-info h4 {
    color: #f8fafc;
    font-size: 1.1rem;
    margin-bottom: 4px;
}

.card-info p {
    color: #94a3b8;
    font-size: 0.85rem;
}

/* Lightbox */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(2, 6, 23, 0.92);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    padding: 20px;
}

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

.lightbox-img {
    max-width: 90vw;
    max-height: 82vh;
    border-radius: 12px;
    border: 1px solid #334155;
    box-shadow: 0 25px 70px rgba(0, 0, 0, 0.6);
}

.lightbox-caption {
    position: absolute;
    bottom: 34px;
    left: 0;
    right: 0;
    text-align: center;
    color: #cbd5e1;
    font-size: 1rem;
    padding: 0 20px;
}

.lightbox-close {
    position: absolute;
    top: 24px;
    right: 28px;
    color: #f8fafc;
    font-size: 1.4rem;
    cursor: pointer;
    background: rgba(30, 41, 59, 0.85);
    width: 46px;
    height: 46px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background 0.3s, color 0.3s, transform 0.3s;
    z-index: 5;
}

.lightbox-close:hover {
    background: #38bdf8;
    color: #0f172a;
    transform: rotate(90deg);
}

/* Services Section */
.services-section {
    padding: 60px 8%;
    text-align: center;
    background: #1e293b;
}

.services-section h2 {
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 30px;
    text-align: left;
}

.service-card {
    background: #0f172a;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 28px;
    display: flex;
    flex-direction: column;
    transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

.service-card:hover {
    transform: translateY(-6px);
    border-color: #38bdf8;
    box-shadow: 0 8px 25px rgba(56, 189, 248, 0.15);
}

.service-icon {
    width: 56px;
    height: 56px;
    border-radius: 12px;
    background: rgba(56, 189, 248, 0.12);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: #38bdf8;
    margin-bottom: 16px;
}

.service-card h3 {
    font-size: 1.25rem;
    margin-bottom: 10px;
    color: #f8fafc;
}

.service-card p {
    color: #94a3b8;
    font-size: 0.95rem;
    margin-bottom: 16px;
    flex-grow: 1;
}

.service-list {
    list-style: none;
    margin-bottom: 20px;
}

.service-list li {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #cbd5e1;
    font-size: 0.9rem;
    padding: 5px 0;
}

.service-list li i {
    color: #22c55e;
    font-size: 0.85rem;
}

.service-link {
    color: #38bdf8;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: color 0.3s;
    margin-top: auto;
}

.service-link:hover {
    color: #0284c7;
}

/* Videos Section */
.videos-section {
    padding: 60px 8%;
    text-align: center;
}

.videos-section h2 {
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.videos-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 25px;
    margin-top: 30px;
    text-align: left;
    align-items: start;
}

.main-video-container {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 12px;
    overflow: hidden;
}

.main-video-container iframe,
.main-video-container video {
    width: 100%;
    aspect-ratio: 16 / 9;
    height: auto;
    border: none;
    display: block;
    background: #0f172a;
}

.main-video-container h3 {
    padding: 16px 20px;
    font-size: 1.1rem;
    line-height: 1.5;
}

/* Videos Sidebar */
.videos-sidebar {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

/* Video Grid */
.video-grid {
    display: grid;
    gap: 14px;
}

.video-card {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 10px;
    overflow: hidden;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}

.video-card:hover {
    transform: translateY(-3px);
    border-color: #38bdf8;
    box-shadow: 0 6px 20px rgba(56, 189, 248, 0.15);
}

.video-card img {
    width: 110px;
    aspect-ratio: 16 / 9;
    object-fit: cover;
    flex-shrink: 0;
}

.video-card-info {
    padding-right: 12px;
    min-width: 0;
}

.video-card-info p {
    font-weight: 600;
    font-size: 0.9rem;
    line-height: 1.4;
    color: #f8fafc;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* YouTube Channel Preview Card */
.yt-channel-preview {
    display: block;
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 12px;
    overflow: hidden;
    text-decoration: none;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.yt-channel-preview:hover {
    transform: translateY(-3px);
    border-color: rgba(255, 0, 0, 0.4);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.yt-banner {
    height: 80px;
    background: linear-gradient(135deg, #ff0000 0%, #cc0000 50%, #990000 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    position: relative;
    overflow: hidden;
}

.yt-banner::before {
    content: "";
    position: absolute;
    inset: 0;
    background: repeating-linear-gradient(
        45deg,
        transparent,
        transparent 10px,
        rgba(255, 255, 255, 0.03) 10px,
        rgba(255, 255, 255, 0.03) 20px
    );
}

.yt-banner-channel {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.4);
    position: relative;
    z-index: 1;
    flex-shrink: 0;
}

.yt-banner-channel img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    border-radius: 50%;
}

.yt-banner-fallback {
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
}

.yt-banner-text {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.3rem;
    font-weight: 700;
    font-family: 'Poppins', sans-serif;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    gap: 8px;
    position: relative;
    z-index: 1;
}

.yt-banner-text i {
    font-size: 1.6rem;
}

.yt-channel-body {
    padding: 12px 16px 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.yt-channel-meta {
    flex: 1;
    min-width: 0;
}

.yt-channel-meta h4 {
    color: #f8fafc;
    font-size: 1rem;
    font-family: 'Poppins', sans-serif;
    margin: 0 0 2px 0;
    line-height: 1.3;
}

.yt-handle {
    color: #94a3b8;
    font-size: 0.78rem;
    margin: 0 0 4px 0;
    font-family: 'Poppins', sans-serif;
}

.yt-desc {
    color: #64748b;
    font-size: 0.75rem;
    margin: 0;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.yt-subscribe-btn {
    background: #ff0000;
    color: #fff;
    padding: 7px 14px;
    border-radius: 20px;
    font-size: 0.78rem;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    white-space: nowrap;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 5px;
    transition: background 0.3s ease;
    margin-top: 2px;
}

.yt-channel-preview:hover .yt-subscribe-btn {
    background: #e60000;
}

.yt-subscribe-btn i {
    font-size: 0.7rem;
}

/* Quiz / MCQ Exam Section */
.quiz-section {
    padding: 60px 8%;
    text-align: center;
}

.quiz-section h2 {
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 16px 24px;
    margin: 30px auto 20px;
    max-width: 700px;
    flex-wrap: wrap;
    gap: 12px;
}

.quiz-progress {
    flex: 1;
    min-width: 200px;
}

#progressText {
    font-size: 0.95rem;
    color: #94a3b8;
    margin-bottom: 8px;
    display: block;
}

.progress-bar {
    height: 8px;
    background: #0f172a;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #38bdf8, #22c55e);
    border-radius: 4px;
    transition: width 0.3s ease;
    width: 0%;
}

.quiz-timer {
    font-size: 1.5rem;
    font-weight: 700;
    color: #38bdf8;
    font-family: 'Courier New', monospace;
    min-width: 80px;
    text-align: right;
}

.quiz-card {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 24px;
    max-width: 700px;
    margin: 0 auto;
    text-align: left;
}

.question-area h3 {
    font-size: 1.15rem;
    color: #f8fafc;
    margin-bottom: 20px;
    line-height: 1.6;
}

.options-grid {
    display: grid;
    gap: 12px;
}

.option-btn {
    width: 100%;
    padding: 14px 16px;
    background: #0f172a;
    border: 2px solid #334155;
    border-radius: 8px;
    color: #f8fafc;
    font-size: 0.95rem;
    text-align: left;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 12px;
}

.option-btn:hover {
    border-color: #38bdf8;
    background: #111827;
}

.option-btn.selected {
    border-color: #38bdf8;
    background: rgba(56, 189, 248, 0.15);
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.2);
}

.option-label {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    background: #38bdf8;
    color: #0f172a;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.85rem;
}

.quiz-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid #334155;
}

.quiz-result {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 40px 24px;
    max-width: 500px;
    margin: 30px auto 0;
    text-align: center;
}

.quiz-result h3 {
    font-size: 1.8rem;
    color: #22c55e;
    margin-bottom: 20px;
}

.score-circle {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: conic-gradient(#22c55e calc(var(--score, 0) * 3.6deg), #334155 0);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    position: relative;
}

.score-circle::before {
    content: "";
    position: absolute;
    width: 100px;
    height: 100px;
    background: #0f172a;
    border-radius: 50%;
}

#scorePercent {
    position: relative;
    z-index: 1;
    font-size: 2.5rem;
    font-weight: 700;
    color: #22c55e;
}

.quiz-result p {
    font-size: 1.1rem;
    color: #cbd5e1;
    margin-bottom: 24px;
}

.result-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Quiz Coming Soon */
.quiz-coming-soon {
    text-align: center;
    padding: 60px 20px;
    max-width: 500px;
    margin: 40px auto;
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 16px;
}

.quiz-coming-soon i {
    font-size: 3rem;
    color: #facc15;
    margin-bottom: 16px;
    display: block;
}

.quiz-coming-soon h3 {
    font-size: 1.5rem;
    color: #f8fafc;
    margin-bottom: 10px;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.quiz-coming-soon p {
    color: #94a3b8;
    font-size: 1rem;
    margin-bottom: 24px;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
}

/* Quiz Selection Cards */
.quiz-selection {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 20px;
    max-width: 1100px;
    margin: 30px auto 0;
}

.quiz-card-select {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 24px 20px;
    text-align: center;
    transition: all 0.3s;
}

.quiz-card-select:hover {
    transform: translateY(-6px);
    border-color: #38bdf8;
    box-shadow: 0 10px 25px rgba(56, 189, 248, 0.15);
}

.quiz-select-header i {
    font-size: 1.8rem;
    color: #38bdf8;
    margin-bottom: 10px;
}

.quiz-select-header h3 {
    font-size: 1.35rem;
    color: #f8fafc;
    margin-bottom: 8px;
}

.quiz-select-desc {
    color: #94a3b8;
    font-size: 0.9rem;
    margin-bottom: 14px;
}

.quiz-select-meta {
    display: flex;
    justify-content: center;
    gap: 18px;
    margin-bottom: 18px;
    color: #94a3b8;
    font-size: 0.85rem;
}

.quiz-select-meta i {
    color: #38bdf8;
    margin-right: 4px;
}

/* Quiz results review */
.quiz-result {
    max-width: 700px;
}

.result-header .score-circle, .result-header #scorePercent {
    transition: background 0.4s, color 0.4s;
}

.review-list {
    display: grid;
    gap: 16px;
    margin-top: 30px;
    text-align: left;
}

.review-item {
    background: #0f172a;
    border: 1px solid #334155;
    border-radius: 10px;
    padding: 16px;
}

.review-item.correct {
    border-left: 4px solid #22c55e;
}

.review-item.wrong {
    border-left: 4px solid #f87171;
}

.review-item.skipped {
    border-left: 4px solid #facc15;
}

.review-question {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    font-weight: 600;
    color: #f8fafc;
    margin-bottom: 12px;
    line-height: 1.5;
}

.review-num {
    background: #38bdf8;
    color: #0f172a;
    border-radius: 6px;
    padding: 2px 8px;
    font-size: 0.8rem;
}

.review-state {
    font-size: 0.75rem;
    padding: 2px 10px;
    border-radius: 20px;
    font-weight: 600;
}

.review-state.right {
    background: rgba(34, 197, 94, 0.15);
    color: #22c55e;
}

.review-state.wrong {
    background: rgba(248, 113, 113, 0.15);
    color: #f87171;
}

.review-state.skipped {
    background: rgba(250, 204, 21, 0.15);
    color: #facc15;
}

.review-option {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    margin-bottom: 8px;
    border-radius: 8px;
    background: #1e293b;
    border: 1px solid #334155;
    font-size: 0.9rem;
    color: #cbd5e1;
    flex-wrap: wrap;
}

.review-option .opt-text {
    flex: 1;
    min-width: 150px;
}

.review-option.right-opt {
    border-color: #22c55e;
    background: rgba(34, 197, 94, 0.1);
}

.review-option.wrong-opt {
    border-color: #f87171;
    background: rgba(248, 113, 113, 0.1);
}

.review-option.selected-opt {
    box-shadow: inset 3px 0 0 #38bdf8;
}

.review-tag {
    font-size: 0.7rem;
    color: #94a3b8;
    font-weight: 600;
}

/* Student Registration Section */
.register-section {
    padding: 60px 8%;
    text-align: center;
}

.register-section h2 {
    font-size: 2.2rem;
    margin-bottom: 10px;
}

.register-card {
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 12px;
    padding: 30px;
    max-width: 640px;
    margin: 0 auto;
    text-align: left;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.register-card .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.register-card .form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 18px;
}

.register-card label {
    font-weight: 600;
    color: #94a3b8;
    font-size: 0.9rem;
}

.register-card input[type="text"],
.register-card input[type="tel"],
.register-card input[type="email"],
.register-card select,
.register-card textarea {
    padding: 12px;
    border-radius: 6px;
    border: 1px solid #334155;
    background: #0f172a;
    color: #fff;
    font-family: inherit;
    font-size: 1rem;
    width: 100%;
}

.register-card input:focus,
.register-card select:focus,
.register-card textarea:focus {
    outline: none;
    border-color: #38bdf8;
    box-shadow: 0 0 0 2px rgba(56, 189, 248, 0.25);
}

.register-card select option {
    background: #1e293b;
    color: #fff;
}

.checkbox-group {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 10px;
    background: #0f172a;
    border: 1px solid #334155;
    border-radius: 6px;
    padding: 14px;
}

.check-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
    color: #f8fafc;
    cursor: pointer;
}

.check-item input[type="checkbox"] {
    accent-color: #38bdf8;
    width: 16px;
    height: 16px;
}

.register-btn {
    width: 100%;
    margin-top: 6px;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.form-status {
    text-align: center;
    margin-top: 14px;
    font-weight: 600;
    min-height: 1.2em;
}

.form-status.success {
    color: #22c55e;
}

.form-status.error {
    color: #f87171;
}

@media (max-width: 600px) {
    .register-card {
        padding: 20px;
    }
    .register-card .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }

    .quiz-header {
        flex-direction: column;
        align-items: stretch;
        padding: 14px 16px;
    }
    .quiz-timer {
        text-align: center;
        font-size: 1.25rem;
    }
    .quiz-card {
        padding: 16px;
    }
    .question-area h3 {
        font-size: 1.05rem;
    }
    .option-btn {
        padding: 12px 14px;
        font-size: 0.9rem;
    }
    .quiz-nav {
        flex-direction: column-reverse;
        gap: 10px;
    }
    .quiz-nav button {
        width: 100%;
    }
    .score-circle {
        width: 120px;
        height: 120px;
    }
    #scorePercent {
        font-size: 2rem;
    }
    .result-actions {
        flex-direction: column;
    }
    .result-actions button {
        width: 100%;
    }
    .quiz-selection {
        grid-template-columns: 1fr;
        gap: 14px;
    }
    .review-option .opt-text {
        width: 100%;
        min-width: 0;
    }
    .review-tag {
        width: 100%;
    }
}

/* Contact & Footer */
.contact-section {
    padding: 70px 8%;
    background: #0f172a;
    text-align: center;
}

.contact-section p {
    color: #94a3b8;
    margin: 15px 0 25px 0;
}

/* Bangla Join Section */
.bangla-join-sub {
    color: #94a3b8;
    font-size: 1rem;
    margin-bottom: 8px;
}

.bangla-join-heading {
    font-size: 2.3rem;
    color: #f8fafc;
    margin-bottom: 36px;
}

.bangla-social-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    max-width: 900px;
    margin: 0 auto 40px auto;
}

.bangla-social-card {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 20px 22px;
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 14px;
    text-decoration: none;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.bangla-social-card:hover {
    transform: translateY(-4px);
}

.bangla-social-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    flex-shrink: 0;
    color: #ffffff;
}

.bangla-social-card.yt .bangla-social-icon {
    background: #ff0000;
    box-shadow: 0 4px 14px rgba(255, 0, 0, 0.3);
}

.bangla-social-card.yt:hover {
    border-color: #ff0000;
    box-shadow: 0 8px 24px rgba(255, 0, 0, 0.2);
}

.bangla-social-card.fb .bangla-social-icon {
    background: #1877f2;
    box-shadow: 0 4px 14px rgba(24, 119, 242, 0.3);
}

.bangla-social-card.fb:hover {
    border-color: #1877f2;
    box-shadow: 0 8px 24px rgba(24, 119, 242, 0.2);
}

.bangla-social-card.wa .bangla-social-icon {
    background: #25d366;
    box-shadow: 0 4px 14px rgba(37, 211, 102, 0.3);
}

.bangla-social-card.wa:hover {
    border-color: #25d366;
    box-shadow: 0 8px 24px rgba(37, 211, 102, 0.2);
}

.bangla-social-card.em .bangla-social-icon {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    box-shadow: 0 4px 14px rgba(245, 158, 11, 0.3);
}

.bangla-social-card.em:hover {
    border-color: #f59e0b;
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.2);
}

.bangla-social-card.tt .bangla-social-icon {
    background: #010101;
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.4);
}

.bangla-social-card.tt:hover {
    border-color: #010101;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.bangla-social-card.tt:hover .bangla-social-icon {
    background: #1a1a1a;
}

.bangla-social-name {
    flex: 1;
    font-size: 1.05rem;
    font-weight: 600;
    color: #f8fafc;
}

.bangla-social-action {
    font-size: 0.88rem;
    font-weight: 600;
    white-space: nowrap;
    display: flex;
    align-items: center;
    gap: 6px;
}

.bangla-social-card.yt .bangla-social-action { color: #ff4d4d; }
.bangla-social-card.fb .bangla-social-action { color: #60a5fa; }
.bangla-social-card.wa .bangla-social-action { color: #4ade80; }
.bangla-social-card.em .bangla-social-action { color: #fbbf24; }
.bangla-social-card.tt .bangla-social-action { color: #ffffff; }

.bangla-social-action i {
    font-size: 0.8rem;
    transition: transform 0.3s ease;
}

.bangla-social-card:hover .bangla-social-action i {
    transform: translateX(4px);
}

.contact-phone {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.contact-phone a {
    color: #38bdf8;
    text-decoration: none;
}

.contact-phone a:hover {
    text-decoration: underline;
}

footer {
    text-align: center;
    padding: 20px;
    color: #64748b;
    font-size: 0.9rem;
    background: #0f172a;
}
/* Mobile Responsive Improvements */
@media (max-width: 600px) {
    header {
        padding: 12px 5%;
    }
    
    .logo {
        font-size: 1.3rem;
    }

    nav ul {
        gap: 10px;
    }

    nav a {
        font-size: 0.9rem;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero p {
        font-size: 0.95rem;
    }

.gallery-grid, .services-grid, .videos-layout {
        grid-template-columns: 1fr;
    }
}
/* Logo Styling Improvements */
.logo {
    display: flex;
    align-items: center;
    gap: 10px; /* লোগো ও লেখার মধ্যকার দূরত্ব */
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    transition: transform 0.3s ease, text-shadow 0.3s ease;
}

.logo:hover {
    transform: scale(1.04);
    text-shadow: 0 0 16px rgba(56, 189, 248, 0.4);
}

.brand-logo {
    height: 40px; /* লোগোর হাইট প্রয়োজন অনুযায়ী বাড়াতে/কমাতে পারেন */
    width: auto;
    object-fit: contain;
    border-radius: 6px; /* হালকা রাউন্ডেড শেপ */
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.logo:hover .brand-logo {
    transform: scale(1.08) rotate(-3deg);
    box-shadow: 0 0 12px rgba(56, 189, 248, 0.35);
}

.logo span {
    color: #38bdf8;
}
/* ==========================================
   MOBILE & SMALL DEVICE RESPONSIVE STYLES
   ========================================== */

/* মোবাইল মেনু বাটন (পিসিতে হাইড থাকবে) */
.mobile-menu-btn {
    display: none;
    grid-column: 3;
    justify-self: end;
    background: transparent;
    border: 2px solid transparent;
    border-radius: 10px;
    color: #f8fafc;
    font-size: 1.6rem;
    width: 42px;
    height: 42px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: color 0.3s, background 0.3s, border-color 0.3s, transform 0.3s;
}

.mobile-menu-btn:hover {
    color: #38bdf8;
    background: rgba(56, 189, 248, 0.1);
}

.mobile-menu-btn.active {
    color: #38bdf8;
    background: rgba(56, 189, 248, 0.15);
    border-color: rgba(56, 189, 248, 0.3);
}

@media (max-width: 900px) {
    header {
        padding: 14px 5%;
    }

    nav#navMenu {
        padding: 5px 8px;
    }

    nav ul {
        gap: 2px;
    }

    nav a {
        font-size: 0.82rem;
        padding: 8px 12px;
    }

    .bangla-social-grid {
        grid-template-columns: repeat(2, 1fr);
        max-width: 100%;
    }
}

/* ট্যাবলেট এবং মোবাইল স্ক্রিনের জন্য (768px বা তার নিচে) */
@media (max-width: 768px) {
    header {
        padding: 15px 5%;
        position: relative;
    }

    /* মোবাইলে মেনু বাটন শো করবে */
    .mobile-menu-btn {
        display: flex;
    }

    nav#navMenu {
        position: absolute;
        top: calc(100% + 6px);
        left: 3%;
        right: 3%;
        width: auto;
        background: #0f172a !important;
        border: 1px solid rgba(56, 189, 248, 0.3);
        border-radius: 16px;
        box-shadow: 0 16px 40px rgba(0, 0, 0, 0.7);
        padding: 0;
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        transition: max-height 0.4s ease, opacity 0.3s ease, padding 0.3s ease;
        z-index: 1001;
        animation: none;
    }

    nav#navMenu.active {
        max-height: 80vh;
        opacity: 1;
        padding: 8px;
        overflow-y: auto;
        background: #0f172a !important;
        border-color: rgba(56, 189, 248, 0.4);
        box-shadow: 0 16px 40px rgba(0, 0, 0, 0.8), 0 0 24px rgba(56, 189, 248, 0.12);
    }

    nav ul {
        flex-direction: column;
        gap: 2px;
        padding: 0;
    }

    /* মোবাইলে অন্তর্ভুক্তি অ্যানিমেশন বন্ধ করলাম */
    nav ul li {
        opacity: 1;
        animation: none;
    }

    nav ul li {
        width: 100%;
        text-align: left;
    }

    nav a {
        display: block;
        padding: 12px 16px;
        font-size: 0.92rem;
        letter-spacing: 0.3px;
        border-radius: 10px;
        transform: none;
        color: #e2e8f0;
    }

    /* ঈৃনাইট আন্ডারলাইন মোবাইলে দেখানে পেরা বাদ */
    nav a::after {
        display: none;
    }

    nav a:hover,
    nav a:active {
        background: rgba(56, 189, 248, 0.12);
    }

    nav a.active-link {
        color: #ffffff;
        background: linear-gradient(135deg, #0ea5e9, #0284c7);
    }

    nav a.active-link::after {
        display: none;
    }

    /* Mobile dropdown */
    .nav-dropdown > .nav-link {
        display: flex;
        justify-content: space-between;
        align-items: center;
        width: 100%;
        gap: 8px;
    }

    .nav-dropdown > .nav-link i {
        font-size: 0.7rem;
        margin-left: 0;
        transition: transform 0.3s ease;
        flex-shrink: 0;
    }

    .nav-dropdown.dropdown-open > .nav-link i {
        transform: rotate(180deg);
    }

    .nav-dropdown::after {
        display: none;
    }

    .dropdown-menu {
        position: static !important;
        transform: none !important;
        left: auto !important;
        top: auto !important;
        min-width: 0 !important;
        width: 100%;
        background: #0c1322;
        border: 1px solid rgba(56, 189, 248, 0.35);
        border-radius: 12px;
        box-shadow: 0 6px 20px rgba(0, 0, 0, 0.5);
        padding: 0;
        margin: 4px 0 2px 0;
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s ease, padding 0.35s ease;
    }

    .dropdown-menu::before {
        display: none !important;
    }

    .nav-dropdown.dropdown-open > .dropdown-menu {
        max-height: 300px;
        padding: 6px 0;
    }

    .dropdown-menu li {
        list-style: none;
    }

    .dropdown-menu li a {
        padding: 11px 16px;
        font-size: 0.9rem;
        border-radius: 8px;
        margin: 2px 6px;
        color: #f1f5f9;
        display: flex;
        align-items: center;
        gap: 10px;
    }

    .dropdown-menu li a i {
        color: #38bdf8;
        width: 18px;
        text-align: center;
        margin-right: 0;
    }

    .dropdown-menu li a:hover,
    .dropdown-menu li a:active {
        background: rgba(56, 189, 248, 0.18);
        color: #ffffff;
    }

    /* হিরো ও অন্যান্য সেকশন ছোট স্ক্রিনের সাথে মানিয়ে নেওয়া */
    .hero {
        padding: 60px 5%;
        min-height: auto;
        text-align: center;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero p {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-btns, .hero-stats {
        justify-content: center;
    }

    .mentor-container {
        grid-template-columns: 1fr;
        gap: 30px;
        text-align: center;
    }

    .mentor-photo {
        max-width: 360px;
        margin: 0 auto;
        animation: none;
    }

    .mentor-info h2 {
        font-size: 1.9rem;
    }

    .mentor-actions {
        justify-content: center;
    }

    .mentor-features li {
        justify-content: center;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 0.95rem;
    }

    .demo-card {
        animation: none;
        max-width: 420px;
        margin: 0 auto;
    }

    .services-grid, .gallery-grid, .videos-layout, .bangla-social-grid {
        grid-template-columns: 1fr;
        max-width: 100%;
        overflow-x: hidden;
    }

    .gallery-grid {
        grid-auto-rows: 200px;
    }

    .gallery-card.featured {
        grid-column: auto;
        grid-row: auto;
    }
}

/* ==========================================
   ICON ENHANCEMENTS
   ========================================== */

/* SSC 2026 Ready badge bolt icon */
.hero-badge i {
    color: #facc15;
    filter: drop-shadow(0 0 6px rgba(250, 204, 21, 0.5));
}

/* Hero stat label icons */
.hero-stat .stat-label i {
    color: #22c55e;
    margin-right: 5px;
    font-size: 0.9rem;
}

/* Button icons spacing */
.btn i {
    margin-right: 8px;
}

/* Section heading icons */
.services-section h2 i,
.videos-section h2 i,
.gallery-section h2 i,
.quiz-section h2 i,
.register-section h2 i {
    color: #38bdf8;
    margin-right: 10px;
    vertical-align: middle;
}

/* Quiz completed trophy */
.quiz-result h3 i {
    color: #facc15;
    margin-right: 8px;
    text-shadow: 0 0 10px rgba(250, 204, 21, 0.4);
}

/* Footer social icons */
footer {
    padding: 28px 20px;
}

.footer-social {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 16px;
}

.footer-social a {
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: #1e293b;
    color: #94a3b8;
    border: 1px solid #334155;
    font-size: 1.05rem;
    text-decoration: none;
    transition: transform 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.footer-social a:hover {
    transform: translateY(-3px);
    color: #38bdf8;
    border-color: #38bdf8;
    box-shadow: 0 8px 18px rgba(56, 189, 248, 0.25);
}

.footer-social a:nth-child(1):hover {
    color: #1877f2;
    border-color: #1877f2;
    box-shadow: 0 8px 18px rgba(24, 119, 242, 0.25);
}

.footer-social a:nth-child(2):hover {
    color: #ff0000;
    border-color: #ff0000;
    box-shadow: 0 8px 18px rgba(255, 0, 0, 0.25);
}

.footer-social a:nth-child(3):hover {
    color: #25d366;
    border-color: #25d366;
    box-shadow: 0 8px 18px rgba(37, 211, 102, 0.25);
}

.footer-social a:nth-child(4):hover {
    color: #ffffff;
    border-color: #010101;
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.3);
    background: #010101;
}

.footer-social a:nth-child(5):hover {
    color: #f59e0b;
    border-color: #f59e0b;
    box-shadow: 0 8px 18px rgba(245, 158, 11, 0.25);
}

/* ==========================================
   CONTACT PAGE
   ========================================== */
.contact-page-section {
    padding: 60px 8% 80px;
    text-align: center;
    min-height: 70vh;
}

.contact-page-section h2 {
    font-size: 2.2rem;
    color: #f8fafc;
    margin-bottom: 12px;
    font-family: 'Outfit', 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.contact-page-section h2 .highlight {
    background: linear-gradient(135deg, #38bdf8, #0284c7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.contact-page-sub {
    color: #94a3b8;
    font-size: 1.05rem;
    max-width: 550px;
    margin: 0 auto 40px;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.contact-page-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    max-width: 900px;
    margin: 0 auto;
}

.contact-page-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 30px 20px;
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 16px;
    text-decoration: none;
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.contact-page-card:hover {
    transform: translateY(-4px);
}

.contact-page-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
}

.contact-page-icon.phone {
    background: rgba(56, 189, 248, 0.15);
    color: #38bdf8;
}

.contact-page-icon.wa {
    background: rgba(37, 211, 102, 0.15);
    color: #25d366;
}

.contact-page-icon.em {
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
}

.contact-page-icon.fb {
    background: rgba(24, 119, 242, 0.15);
    color: #1877f2;
}

.contact-page-icon.yt {
    background: rgba(255, 0, 0, 0.15);
    color: #ff0000;
}

.contact-page-icon.tt {
    background: rgba(0, 0, 0, 0.3);
    color: #ffffff;
}

.contact-page-card h3 {
    color: #f8fafc;
    font-size: 1.1rem;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
    margin: 0;
}

.contact-page-card p {
    color: #94a3b8;
    font-size: 0.88rem;
    margin: 0;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.contact-page-link {
    color: #38bdf8;
    font-size: 0.9rem;
    font-weight: 600;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
    display: flex;
    align-items: center;
    gap: 6px;
}

.contact-page-card.wa-card:hover {
    border-color: #25d366;
    box-shadow: 0 8px 24px rgba(37, 211, 102, 0.15);
}
.contact-page-card.wa-card .contact-page-link { color: #25d366; }

.contact-page-card.em-card:hover {
    border-color: #f59e0b;
    box-shadow: 0 8px 24px rgba(245, 158, 11, 0.15);
}
.contact-page-card.em-card .contact-page-link { color: #f59e0b; }

.contact-page-card.fb-card:hover {
    border-color: #1877f2;
    box-shadow: 0 8px 24px rgba(24, 119, 242, 0.15);
}
.contact-page-card.fb-card .contact-page-link { color: #1877f2; }

.contact-page-card.yt-card:hover {
    border-color: #ff0000;
    box-shadow: 0 8px 24px rgba(255, 0, 0, 0.15);
}
.contact-page-card.yt-card .contact-page-link { color: #ff4d4d; }

.contact-page-card.tt-card:hover {
    border-color: #010101;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}
.contact-page-card.tt-card .contact-page-link { color: #ffffff; }

@media (max-width: 768px) {
    .contact-page-section {
        padding: 40px 5% 60px;
    }

    .contact-page-section h2 {
        font-size: 1.6rem;
    }

    .contact-page-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .contact-page-card {
        flex-direction: row;
        padding: 18px 20px;
        gap: 16px;
    }

    .contact-page-icon {
        width: 48px;
        height: 48px;
        font-size: 1.3rem;
    }
}

/* ==========================================
   GALLERY PAGE
   ========================================== */
.gallery-page-section {
    padding: 60px 8% 80px;
    text-align: center;
    min-height: 70vh;
}

.gallery-page-section h2 {
    font-size: 2.2rem;
    color: #f8fafc;
    margin-bottom: 12px;
    font-family: 'Outfit', 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.gallery-page-section h2 .highlight {
    background: linear-gradient(135deg, #38bdf8, #0284c7);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gallery-page-sub {
    color: #94a3b8;
    font-size: 1.05rem;
    max-width: 550px;
    margin: 0 auto 24px;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.about-roles {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-bottom: 36px;
}

.about-role {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    background: #1e293b;
    border: 1px solid #334155;
    border-radius: 30px;
    font-size: 0.85rem;
    font-weight: 500;
    color: #cbd5e1;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.about-role i {
    color: #38bdf8;
    font-size: 0.8rem;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.gallery-card {
    position: relative;
    border-radius: 16px;
    overflow: hidden;
    aspect-ratio: 4 / 3;
    cursor: pointer;
    transition: transform 0.4s ease, box-shadow 0.4s ease;
}

.gallery-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.6s ease;
}

.gallery-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}

.gallery-card:hover img {
    transform: scale(1.08);
}

.gallery-card::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(15, 23, 42, 0.85) 0%, rgba(15, 23, 42, 0) 55%);
    opacity: 0;
    transition: opacity 0.4s;
}

.gallery-card:hover::after {
    opacity: 1;
}

.gallery-tag {
    position: absolute;
    top: 14px;
    left: 14px;
    z-index: 2;
    padding: 6px 12px;
    background: rgba(56, 189, 248, 0.9);
    color: #0f172a;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    font-family: 'Poppins', sans-serif;
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity 0.3s, transform 0.3s;
}

.gallery-card:hover .gallery-tag {
    opacity: 1;
    transform: translateY(0);
}

.gallery-info {
    position: absolute;
    bottom: 14px;
    left: 14px;
    right: 14px;
    z-index: 2;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.3s, transform 0.3s;
}

.gallery-card:hover .gallery-info {
    opacity: 1;
    transform: translateY(0);
}

.gallery-info h4 {
    color: #fff;
    font-size: 1rem;
    font-family: 'Outfit', 'Poppins', sans-serif;
    margin-bottom: 4px;
}

.gallery-info p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.85rem;
    font-family: 'Poppins', 'Noto Sans Bengali', sans-serif;
}

.gallery-card.featured {
    grid-column: span 2;
    grid-row: span 2;
    aspect-ratio: 16 / 9;
}

@media (max-width: 768px) {
    .gallery-page-section {
        padding: 40px 5% 60px;
    }

    .gallery-page-section h2 {
        font-size: 1.6rem;
    }

    .about-roles {
        gap: 8px;
    }

    .about-role {
        padding: 6px 12px;
        font-size: 0.78rem;
    }

    .gallery-grid {
        grid-template-columns: 1fr;
    }

    .gallery-card.featured {
        grid-column: auto;
        grid-row: auto;
        aspect-ratio: 4 / 3;
    }
}

/* Lightbox */
#lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.95);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 20px;
}

#lightbox.active {
    display: flex;
}

#lightbox img {
    max-width: 100%;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

#lightbox-close {
    position: fixed;
    top: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(30, 41, 59, 0.9);
    border: 1px solid #334155;
    color: #f8fafc;
    font-size: 1.4rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s, border-color 0.3s;
    z-index: 2001;
}

#lightbox-close:hover {
    background: #ff0000;
    border-color: #ff0000;
}