/* Global Resets & Variables */
:root {
    --primary-blue: #0A2540;
    --secondary-blue: #1A56DB;
    --accent-yellow: #FFD700;
    --text-light: #F9FAFB;
    --text-dark: #111827;
    --text-muted: #6B7280;
    --bg-white: #FFFFFF;
    --bg-light: #F3F4F6;
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s;
}

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Loader */
.loader-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: var(--primary-blue);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.loader {
    width: 50px;
    height: 50px;
    border: 5px solid var(--glass-border);
    border-top-color: var(--accent-yellow);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary-blue);
}

.logo span {
    color: var(--accent-yellow);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-links a {
    font-weight: 600;
    font-size: 0.95rem;
    position: relative;
}

.nav-links a:not(.btn)::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 0;
    background-color: var(--secondary-blue);
    transition: width var(--transition-speed);
}

.nav-links a:not(.btn):hover::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    background: none;
    border: none;
    color: var(--primary-blue);
    cursor: pointer;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 24px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-speed);
    text-align: center;
}

.btn-primary {
    background: var(--secondary-blue);
    color: var(--bg-white);
    border: 2px solid var(--secondary-blue);
}

.btn-primary:hover {
    background: transparent;
    color: var(--secondary-blue);
}

.btn-outline {
    background: transparent;
    color: var(--secondary-blue);
    border: 2px solid var(--secondary-blue);
}

.btn-outline:hover {
    background: var(--secondary-blue);
    color: var(--bg-white);
}

.btn.glow {
    box-shadow: 0 0 15px rgba(26, 86, 219, 0.4);
}

.btn.glow:hover {
    box-shadow: 0 0 25px rgba(26, 86, 219, 0.6);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--bg-white);
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

/* Futuristic background elements */
.hero::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-yellow) 0%, rgba(255,215,0,0) 70%);
    top: -200px;
    right: -200px;
    opacity: 0.15;
    border-radius: 50%;
    animation: pulse 4s infinite alternate;
}

.hero::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, #ffffff 0%, rgba(255,255,255,0) 70%);
    bottom: -100px;
    left: -100px;
    opacity: 0.1;
    border-radius: 50%;
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 0.1; }
    100% { transform: scale(1.1); opacity: 0.2; }
}

.hero-content {
    max-width: 800px;
    position: relative;
    z-index: 10;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    text-shadow: 0 4px 10px rgba(0,0,0,0.3);
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 30px;
    opacity: 0.9;
}

/* Glassmorphism Section/Cards */
.glass-section {
    padding: 80px 0;
    position: relative;
}

.glass-card {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.4);
    border-radius: 20px;
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.glass-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.1);
}

/* Grid Layouts */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
}

/* Section Titles */
.section-title {
    text-align: center;
    margin-bottom: 50px;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--primary-blue);
    position: relative;
    display: inline-block;
}

.section-title h2::after {
    content: '';
    position: absolute;
    width: 50%;
    height: 4px;
    background: var(--accent-yellow);
    bottom: -10px;
    left: 25%;
    border-radius: 2px;
}

/* Feature Icon */
.feature-icon {
    font-size: 3rem;
    color: var(--secondary-blue);
    margin-bottom: 20px;
    display: inline-block;
    padding: 20px;
    background: rgba(26, 86, 219, 0.1);
    border-radius: 50%;
}

/* Footer */
.footer {
    background: var(--primary-blue);
    color: var(--text-light);
    padding: 60px 0 20px;
}

.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer h3 span {
    color: var(--accent-yellow);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 10px;
}

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

.social-links {
    margin-top: 15px;
}

.social-links a {
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    text-align: center;
    background: rgba(255,255,255,0.1);
    border-radius: 50%;
    margin-right: 10px;
    transition: all 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* Scroll Reveal Class */
.reveal {
    opacity: 0;
    transform: translateY(50px);
    transition: all 0.8s ease-out;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Form Styles */
.form-container {
    max-width: 500px;
    margin: 40px auto;
}

.form-group {
    margin-bottom: 20px;
}

.form-control {
    width: 100%;
    padding: 15px;
    border: 1px solid rgba(0,0,0,0.1);
    border-radius: 10px;
    font-family: 'Inter', sans-serif;
    font-size: 1rem;
    transition: border-color 0.3s;
}

.form-control:focus {
    outline: none;
    border-color: var(--secondary-blue);
    box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}

.alert {
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-weight: 600;
}

.alert-error {
    background: #FEE2E2;
    color: #991B1B;
    border: 1px solid #F87171;
}

.alert-success {
    background: #D1FAE5;
    color: #065F46;
    border: 1px solid #34D399;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-links {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: var(--bg-white);
        padding: 40px 20px;
        transition: left 0.3s ease;
        box-shadow: 0 10px 10px rgba(0,0,0,0.05);
    }
    
    .nav-links.active {
        left: 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
}

/* Course/Article Cards Image */
.card-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 15px;
    margin-bottom: 20px;
    background: #ddd; /* placeholder */
}

/* Dashboard Sidebar & Main */
.dashboard-layout {
    display: flex;
    min-height: calc(100vh - 80px);
    margin-top: 80px;
}
.sidebar {
    width: 250px;
    background: var(--bg-white);
    padding: 30px 20px;
    border-right: 1px solid rgba(0,0,0,0.05);
}
.sidebar-link {
    display: block;
    padding: 10px 15px;
    margin-bottom: 10px;
    border-radius: 8px;
    color: var(--text-dark);
    transition: background 0.2s;
}
.sidebar-link:hover, .sidebar-link.active {
    background: var(--secondary-blue);
    color: var(--bg-white);
}
.dashboard-content {
    flex: 1;
    padding: 40px;
    background: var(--bg-light);
}

@media (max-width: 768px) {
    .dashboard-layout {
        flex-direction: column;
    }
    .sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid rgba(0,0,0,0.05);
    }
    .dashboard-content {
        padding: 20px;
    }
}