:root {
    --primary-color: #1A237E; /* Deep Indigo */
    --accent-color: #FFB300;  /* Saffron Gold */
    --bg-light: #FAFAFA;
    --bg-accent: #F5F5F5;
    --text-dark: #212121;
    --text-muted: #757575;
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Inter', sans-serif;
    --transition-speed: 0.3s;
    
    /* Material Design Shadows */
    --shadow-1: 0 1px 3px rgba(0,0,0,0.12), 0 1px 2px rgba(0,0,0,0.24);
    --shadow-2: 0 3px 6px rgba(0,0,0,0.16), 0 3px 6px rgba(0,0,0,0.23);
    --shadow-3: 0 10px 20px rgba(0,0,0,0.19), 0 6px 6px rgba(0,0,0,0.23);
    
    --navbar-height: 80px;
}

html {
    scroll-margin-top: 100px;
    scroll-behavior: smooth;
}

section {
    scroll-margin-top: 100px;
}

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

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

/* Navbar Premium Styling */
.navbar {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    transition: var(--transition-speed);
    padding: 1rem 0;
    box-shadow: var(--shadow-1);
    border-bottom: 2px solid var(--accent-color);
}

.navbar-brand {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.6rem;
    color: var(--primary-color) !important;
}

.nav-link {
    font-weight: 600;
    color: var(--text-dark) !important;
    margin: 0 0.8rem;
    transition: var(--transition-speed);
    position: relative;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
}

/* Underline Animation for Nav Links */
.nav-link {
    position: relative;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0.8rem;
    right: 0.8rem;
    height: 3px;
    background: var(--accent-color);
    transform: scaleX(0);
    transition: transform var(--transition-speed) ease;
    transform-origin: bottom right;
}

.nav-link:hover::before {
    transform: scaleX(1);
    transform-origin: bottom left;
}

/* Ensure dropdown caret is visible and beside text */
.dropdown-toggle::after {
    display: inline-block !important;
    margin-left: 0.5rem !important;
    vertical-align: middle !important;
}

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

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

/* Material UI Inspired Cards */
.iiyc-card {
    background: #FFFFFF;
    border: none;
    border-radius: 16px;
    box-shadow: var(--shadow-1);
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    overflow: hidden;
    height: 100%;
}

.iiyc-card:hover {
    transform: translateY(-10px) scale(1.01);
    box-shadow: 0 20px 40px rgba(0,0,0,0.12);
}

.iiyc-image-container {
    height: 220px;
    overflow: hidden;
}

.iiyc-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.iiyc-card:hover img {
    transform: scale(1.1);
}

.iiyc-card-body {
    padding: 2rem;
}

/* Premium Buttons */
.btn-premium {
    background: var(--primary-color);
    color: white;
    padding: 0.8rem 2.5rem;
    border-radius: 8px; /* Material Design style */
    font-weight: 600;
    transition: var(--transition-speed);
    border: none;
    box-shadow: var(--shadow-1);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn-premium::after {
    content: '';
    position: absolute;
    top: 0; left: -100%; width: 50%; height: 100%;
    background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,0.3) 50%, rgba(255,255,255,0) 100%);
    transform: skewX(-20deg);
    transition: all 0.5s ease;
    z-index: -1;
}

.btn-premium:hover {
    background: #0D1642; /* Even deeper indigo */
    color: white;
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 10px 20px rgba(26, 35, 126, 0.4);
}

.btn-premium:hover::after {
    left: 150%;
}

.btn-outline-premium {
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    padding: 0.8rem 2.5rem;
    border-radius: 8px;
    font-weight: 600;
    transition: var(--transition-speed);
    background: transparent;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-outline-premium:hover {
    background: var(--primary-color);
    color: white;
}

/* Stats Styling */
.stat-card {
    background: white;
    padding: 3rem 2rem;
    border-radius: 20px;
    box-shadow: var(--shadow-1);
    border-bottom: 5px solid var(--accent-color);
    transition: var(--transition-speed);
}

.stat-card:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-2);
}

/* Footer Styling */
footer {
    background: #121212;
    color: #E0E0E0;
    padding: 80px 0 30px;
}

footer a {
    color: #BDBDBD;
    text-decoration: none;
    transition: var(--transition-speed);
}

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

.footer-logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: white;
    margin-bottom: 1.5rem;
    display: block;
}

/* Topic Cards */
.topic-card {
    background: #FFFFFF;
    border-radius: 20px;
    overflow: hidden;
    height: 100%;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    box-shadow: var(--shadow-1);
    border: none;
    display: flex;
    flex-direction: column;
}

.topic-card:hover {
    transform: translateY(-10px) scale(1.01);
    box-shadow: 0 20px 40px rgba(0,0,0,0.12);
}

.topic-image-container {
    height: 200px;
    overflow: hidden;
}

.topic-image-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.topic-card:hover .topic-image-container img {
    transform: scale(1.1);
}

.topic-body {
    padding: 2rem;
    text-align: center;
    flex-grow: 1;
}

.topic-body .material-icons {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

/* Topic Poster Cards (New Design) */
.topic-poster-card {
    border-radius: 2px; /* Sharper edges like a physical poster */
    overflow: hidden;
    transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), box-shadow 0.4s ease;
    background: #fff;
    border: 8px solid #fff; /* White frame effect */
}

.topic-link:hover .topic-poster-card {
    transform: translateY(-15px) rotate(1deg);
    box-shadow: 0 30px 60px rgba(0,0,0,0.15) !important;
}

.topic-title {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-top: 1rem;
    transition: color var(--transition-speed);
}

.topic-arrow {
    font-size: 2rem !important;
    transition: transform 0.3s ease, color 0.3s ease;
}

.topic-link:hover .topic-arrow {
    transform: translate(5px, -5px);
    color: var(--accent-color) !important;
}

.topic-link:hover .topic-title {
    color: var(--primary-color);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    opacity: 0;
    animation: fadeIn 1s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Section Header Decoration */
.header-underline {
    width: 60px;
    height: 4px;
    background: var(--accent-color);
    margin: 15px auto;
    border-radius: 2px;
}

/* Page Headers for Multi-page */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, #0D1642 100%);
    padding: calc(var(--navbar-height) + 60px) 0 60px;
    color: white;
    text-align: center;
}

.page-header h1 {
    color: var(--accent-color);
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.breadcrumb-item + .breadcrumb-item::before {
    color: rgba(255,255,255,0.5);
}

.breadcrumb-item a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
}

.breadcrumb-item.active {
    color: var(--accent-color);
}

/* Fix for hiding behind navbar on direct load */
:target {
    scroll-margin-top: 100px;
}

/* Ensure first main section has enough padding */
main section:first-of-type, .article-hero {
    padding-top: calc(var(--navbar-height) + 40px);
}

/* Scroll Progress Bar */
#scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-color), #ff5722);
    width: 0%;
    z-index: 10000;
    transition: width 0.1s ease-out;
    pointer-events: none;
}

/* Floating Animation */
@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0px); }
}

.contact-toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: #111;
    color: #fff;
    padding: 1rem 1.5rem;
    border-radius: 0.75rem;
    box-shadow: var(--shadow-2);
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
    transition: opacity 0.3s ease, transform 0.3s ease;
    z-index: 9999;
}

.contact-toast.show {
    opacity: 1;
    transform: translateY(0);
}

.contact-toast.error {
    background: #b71c1c;
}

.float-anim {
    animation: float 6s ease-in-out infinite;
}

/* --- Media Queries for Responsiveness --- */

/* Tablets and below */
@media (max-width: 991.98px) {
    .page-header h1, .display-3 {
        font-size: 2.8rem;
    }
    .display-4 {
        font-size: 2.2rem;
    }
    .display-5 {
        font-size: 1.8rem;
    }
    .section-padding {
        padding: 60px 0;
    }
    #home.bg-accent {
        padding-top: calc(var(--navbar-height) + 20px);
    }
    .navbar-collapse {
        background: rgba(255, 255, 255, 0.98);
        padding: 1rem;
        border-radius: 8px;
        box-shadow: var(--shadow-2);
        margin-top: 10px;
    }
}

/* Mobile Devices */
@media (max-width: 767.98px) {
    .page-header h1, .display-3 {
        font-size: 2.2rem;
    }
    #home .row, .page-header {
        text-align: center;
    }
    #home .d-flex.gap-3.flex-wrap {
        justify-content: center;
    }
    .stat-card {
        padding: 2rem 1rem;
    }
    .topic-image-container {
        height: 150px;
    }
}