:root {
    /* Color Scheme */
    --primary: #4a6cf7;
    --primary-dark: #3a5bd9;
    --secondary: #00bfae;
    --accent: #ff6b6b;
    --text: #2d3748;
    --text-light: #718096;
    --bg: #ffffff;
    --bg-light: #f8fafc;
    --border: #e2e8f0;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    
    /* Dark Mode Colors */
    --dark-bg: #0f172a;
    --dark-bg-light: #1e293b;
    --dark-text: #f1f5f9;
    --dark-text-light: #94a3b8;
    --dark-border: #334155;
    
    /* Typography */
    --font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Transitions */
    --transition: all 0.2s ease;
    
    /* Legacy Variables (for existing components) */
    --sidebar-bg: var(--dark-bg-light);
    --sidebar-active: var(--primary);
    --card-bg: var(--bg);
    --card-correct: #1b5e20;
    --card-correct-fg: #b9f6ca;
    --card-incorrect: #b71c1c;
    --card-incorrect-fg: #ff8a80;
    --scoreboard-bg: var(--bg);
    --export-btn-bg: var(--primary);
    --export-btn-fg: white;
    --export-btn-hover-bg: var(--primary-dark);
    --export-btn-hover-fg: white;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: linear-gradient(-45deg, #f3f4f6, #e5e7eb, #f0f9ff, #eff6ff);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    color: #1f2937;
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 30%, rgba(124, 58, 237, 0.03) 0%, transparent 25%),
        radial-gradient(circle at 80% 70%, rgba(99, 102, 241, 0.05) 0%, transparent 25%),
        radial-gradient(circle at 40% 80%, rgba(79, 70, 229, 0.03) 0%, transparent 25%);
    pointer-events: none;
    z-index: -1;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

@keyframes float1 {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(20px, 20px) rotate(2deg); }
}

@keyframes float2 {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(-20px, 20px) rotate(-2deg); }
}

/* Floating background elements */
.bg-blob-1, .bg-blob-2 {
    position: fixed;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.4;
    z-index: -1;
    animation-duration: 25s;
    animation-iteration-count: infinite;
    animation-timing-function: ease-in-out;
}

.bg-blob-1 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    top: -150px;
    right: -150px;
    animation-name: float1;
}

.bg-blob-2 {
    width: 600px;
    height: 600px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    bottom: -200px;
    left: -200px;
    animation-name: float2;
    animation-delay: 2s;
}

/* Dark Mode */
body.dark {
    --bg: var(--dark-bg);
    --text: var(--dark-text);
    --text-light: var(--dark-text-light);
    --border: var(--dark-border);
    --card-bg: var(--dark-bg-light);
    --export-btn-bg: var(--primary);
    --export-btn-fg: white;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text);
}

h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
}

h2 {
    font-size: 2.5rem;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-light);
}

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

a:hover {
    color: var(--primary-dark);
}

.highlight {
    color: var(--primary);
}

/* Buttons */
button, .btn {
    cursor: pointer;
    font-family: inherit;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    padding: 0.75rem 1.5rem;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 1rem;
    line-height: 1.5;
}

button:focus, .btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(74, 108, 247, 0.3);
}

.primary-btn {
    background: var(--primary);
    color: white;
    font-weight: 600;
    box-shadow: var(--shadow-md);
}

.primary-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.primary-btn:active {
    transform: translateY(0);
}

.primary-btn i {
    transition: transform 0.2s ease;
}

.primary-btn:hover i {
    transform: translateX(3px);
}

.secondary-btn {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
    font-weight: 600;
}

.secondary-btn:hover {
    background: rgba(74, 108, 247, 0.1);
    transform: translateY(-1px);
}

.full-width {
    width: 100%;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Navbar */
/* Navigation Bar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem 5%;
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.05);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    height: 75px;
    box-sizing: border-box;
    border-bottom: 1px solid rgba(255, 255, 255, 0.4);
}

/* Brand Styling */
.brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
}

.brand i {
    font-size: 1.8rem;
    color: #4f46e5;
    transition: transform 0.3s ease;
}

.brand span {
    font-size: 1.6rem;
    font-weight: 700;
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.5px;
    transition: all 0.3s ease;
}

.brand:hover i {
    transform: rotate(-10deg);
}

.brand:hover span {
    letter-spacing: 0.5px;
}

.navbar.scrolled {
    padding: var(--spacing-sm) var(--spacing-lg);
    box-shadow: var(--shadow-md);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
}

.dark .navbar.scrolled {
    background: rgba(15, 23, 42, 0.95);
}

.main-nav {
    display: flex;
    gap: 2.2rem;
    align-items: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-link {
    color: white;
    font-weight: 500;
    font-size: 0.98rem;
    text-decoration: none;
    position: relative;
    padding: 0.5rem 1rem;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 8px;
    letter-spacing: -0.01em;
    opacity: 0.9;
}

.nav-link:hover {
    color: white;
    background: rgba(255, 255, 255, 0.15);
    opacity: 1;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.5);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: 1.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.nav-actions::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 60%;
    background: linear-gradient(to bottom, transparent, #e5e7eb, transparent);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-color);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.mobile-menu-btn:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.3);
    border-radius: 4px;
}

/* Mobile menu styles */
@media (max-width: 992px) {
    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        border-radius: 8px;
        background: #f3f4f6;
        color: #4f46e5;
        transition: all 0.2s ease;
    }
    
    .mobile-menu-btn:hover {
        background: #e5e7eb;
    }
    
    .mobile-menu-btn i {
        font-size: 1.4rem;
    }
    
    .main-nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 1.5rem 2rem;
        gap: 1.2rem;
        box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.05);
        transform: translateY(-20px);
        opacity: 0;
        pointer-events: none;
        z-index: 999;
        border-radius: 0 0 16px 16px;
        border: 1px solid rgba(0, 0, 0, 0.05);
        border-top: none;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }
    
    .main-nav.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
    
    .main-nav .nav-link {
        width: 100%;
        padding: 0.75rem 0;
        border-bottom: 1px solid #f3f4f6;
    }
    
    .main-nav .nav-actions {
        width: 100%;
        flex-direction: column;
        gap: 1rem;
        margin: 0.5rem 0 0;
        padding: 1.5rem 0 0.5rem;
        border-top: 1px solid #f3f4f6;
    }
    
    .main-nav .nav-actions::before {
        display: none;
    }
    
    .main-nav .primary-btn {
        width: 100%;
        text-align: center;
        justify-content: center;
    }
}

/* Hero Section */
.landing-hero {
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 100vh;
    padding: 6rem 5% 5rem;
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    gap: 3rem;
    overflow: hidden;
}

.hero-content {
    flex: 1;
    max-width: 600px;
    position: relative;
    z-index: 2;
    animation: fadeInUp 0.8s ease-out forwards;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: linear-gradient(90deg, rgba(99, 102, 241, 0.1), rgba(124, 58, 237, 0.1));
    color: var(--primary-color);
    padding: 0.6rem 1.2rem;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 1.8rem;
    animation: fadeIn 0.8s ease-out 0.2s both;
    border: 1px solid rgba(99, 102, 241, 0.2);
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.1);
}

.hero-badge i {
    color: #fbbf24;
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.15;
    margin-bottom: 1.8rem;
    background: linear-gradient(120deg, #1e293b, #4f46e5);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out 0.3s forwards;
    letter-spacing: -0.5px;
}

.hero-content .highlight {
    background: linear-gradient(120deg, var(--primary-color), #6366f1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: #4b5563;
    margin-bottom: 2.5rem;
    line-height: 1.7;
    max-width: 90%;
    opacity: 0;
    animation: fadeInUp 0.8s ease-out 0.4s forwards;
}

.hero-image {
    flex: 1;
    position: relative;
    min-height: 500px;
    display: flex;
    justify-content: center;
    align-items: center;
    perspective: 1000px;
}

.hero-image-bg {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: 1;
    border-radius: 20px;
    background: linear-gradient(145deg, rgba(99, 102, 241, 0.1), rgba(99, 102, 241, 0.05));
    transform-style: preserve-3d;
    transform: rotateY(-5deg) rotateX(5deg);
    animation: float 8s ease-in-out infinite;
}

.pulse-dot {
    position: absolute;
    border-radius: 50%;
    background: var(--primary-color);
    opacity: 0.2;
    animation: pulse 3s infinite;
}

.pulse-dot.dot-1 {
    width: 100px;
    height: 100px;
    top: 10%;
    left: 15%;
    animation-delay: 0s;
}

.pulse-dot.dot-2 {
    width: 150px;
    height: 150px;
    bottom: 15%;
    right: 10%;
    animation-delay: 0.5s;
}

.pulse-dot.dot-3 {
    width: 70px;
    height: 70px;
    top: 60%;
    left: 25%;
    animation-delay: 1s;
}

@keyframes pulse {
    0% {
        transform: scale(0.8);
        opacity: 0.2;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.3;
    }
    100% {
        transform: scale(0.8);
        opacity: 0.2;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    width: 100%;
    max-width: 1200px;
    margin: 3rem auto 0;
    position: relative;
    z-index: 2;
    padding: 0 1.5rem;
}

.feature-card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 18px;
    padding: 2.8rem 2.2rem;
    text-align: center;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.8);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.06);
    transform: translateY(0);
}

.feature-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.8rem;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.05), rgba(124, 58, 237, 0.05));
    border-radius: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #4f46e5;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(79, 70, 229, 0.1);
    position: relative;
    z-index: 1;
    overflow: hidden;
}

.feature-icon::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(124, 58, 237, 0.1));
    z-index: -1;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.2rem;
    color: #111827;
    font-weight: 600;
    line-height: 1.3;
    letter-spacing: -0.01em;
    position: relative;
    display: inline-block;
}

.feature-card h3::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #4f46e5, #7c3aed);
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.feature-card p {
    color: #4b5563;
    font-size: 1.05rem;
    line-height: 1.7;
    margin-bottom: 1.8rem;
    opacity: 0.9;
    transition: all 0.4s ease;
}

.feature-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.08);
    border-color: rgba(79, 70, 229, 0.3);
}

.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    color: white;
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 15px 30px rgba(79, 70, 229, 0.25);
}

.feature-card:hover .feature-icon::before {
    opacity: 1;
}

.feature-card:hover h3::after {
    width: 100%;
}

.feature-card:hover p {
    opacity: 1;
}

/* Responsive adjustments */
@media (max-width: 992px) {
    .feature-cards {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 2rem auto 0;
        padding: 0 1.5rem;
    }
    
    .feature-card {
        padding: 2.2rem 1.8rem;
        border-radius: 16px;
    }
    
    .feature-icon {
        width: 70px;
        height: 70px;
        font-size: 1.8rem;
        margin-bottom: 1.5rem;
    }
    
    .feature-card h3 {
        font-size: 1.4rem;
        margin-bottom: 1rem;
    }
    
    .feature-card p {
        font-size: 1rem;
        margin-bottom: 1.5rem;
    }
}

/* Auth Card and Overlay */
.auth-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    z-index: 999;
    opacity: 0;
    transition: opacity 220ms ease-out;
}

.auth-overlay.visible {
    opacity: 1;
}

.auth-card {
    display: none;
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    padding: 2rem;
    border-radius: 16px;
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.2);
    z-index: 1001;
    width: 90%;
    max-width: 420px;
    opacity: 0;
    transition: opacity 220ms ease-out, transform 220ms ease-out;
}

.auth-card.visible {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.close-auth {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: #6b7280;
    transition: color 0.2s ease;
}

.close-auth:hover {
    color: #4f46e5;
}

.auth-card-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.auth-card-header h2 {
    margin: 0 0 0.5rem;
    color: #111827;
    font-size: 1.5rem;
    font-weight: 600;
}

.auth-card-header p {
    margin: 0;
    color: #6b7280;
    font-size: 0.95rem;
}

.auth-card {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    width: 100%;
    max-width: 450px;
    z-index: 1100;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.auth-card.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.auth-card-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.auth-card-header h2 {
    margin-bottom: 0.5rem;
    color: var(--text);
}

.auth-card-header p {
    color: var(--text-light);
    margin-bottom: 0;
}

.close-auth {
    position: absolute;
    top: -10px;
    right: -10px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--bg-light);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    transition: var(--transition);
}

.close-auth:hover {
    background: var(--primary);
    color: white;
    transform: rotate(90deg);
}

.auth-tabs {
    display: flex;
    background: var(--bg-light);
    border-radius: var(--radius-md);
    padding: 0.25rem;
    margin-bottom: var(--spacing-md);
    position: relative;
}

.auth-tab {
    flex: 1;
    padding: 0.75rem;
    background: none;
    border: none;
    color: var(--text-light);
    font-weight: 600;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.auth-tab.active {
    background: var(--bg);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.auth-tab i {
    font-size: 1.1rem;
}

.divider {
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-light);
    font-size: 0.875rem;
    padding: 0 0.5rem;
}

.auth-panel {
    display: none;
    animation: fadeIn 0.3s ease;
}

.auth-panel.active {
    display: block;
}

.input-group {
    position: relative;
    margin-bottom: var(--spacing-md);
}

.input-group i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    transition: var(--transition);
}

.input-group input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 3rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--bg);
    color: var(--text);
}

.input-group input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(74, 108, 247, 0.2);
}

.input-group input:focus + i {
    color: var(--primary);
}

.toggle-password {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition);
}

.toggle-password:hover {
    color: var(--primary);
}

.auth-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-light);
}

.remember-me input {
    display: none;
}

.checkmark {
    width: 1.25rem;
    height: 1.25rem;
    border: 2px solid var(--border);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.remember-me input:checked + .checkmark {
    background: var(--primary);
    border-color: var(--primary);
}

.remember-me input:checked + .checkmark::after {
    content: '✓';
    color: white;
    font-size: 0.75rem;
}

.forgot-password {
    font-size: 0.875rem;
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.forgot-password:hover {
    text-decoration: underline;
}

.auth-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: var(--spacing-md) 0;
    color: var(--text-light);
    font-size: 0.875rem;
}

.auth-divider::before,
.auth-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
}

.social-auth {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    font-weight: 500;
    transition: var(--transition);
}

.social-btn:hover {
    background: var(--bg-light);
    transform: translateY(-1px);
}

.social-btn img {
    width: 18px;
    height: 18px;
}

.social-btn.google {
    color: #DB4437;
}

.social-btn.microsoft {
    color: #00A4EF;
}

.auth-footer {
    text-align: center;
    margin-top: var(--spacing-md);
    color: var(--text-light);
    font-size: 0.875rem;
}

.auth-link {
    color: var(--primary);
    font-weight: 500;
    text-decoration: none;
}

.auth-link:hover {
    text-decoration: underline;
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    display: flex;
    justify-content: center;
    align-items: center;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Publish Animation Modal */
.publish-modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.publish-modal.show {
    opacity: 1;
    visibility: visible;
}

.publish-modal-content {
    background: white;
    border-radius: 12px;
    width: 90%;
    max-width: 400px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transform: translateY(20px);
    transition: all 0.3s ease;
}

.publish-modal.show .publish-modal-content {
    transform: translateY(0);
}

.publish-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    color: var(--primary);
}

.publish-progress {
    width: 100%;
    height: 6px;
    background: #f0f0f0;
    border-radius: 3px;
    margin: 1.5rem 0;
    overflow: hidden;
}

.publish-progress-bar {
    height: 100%;
    width: 0%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 0.3s ease;
}

.publish-status {
    font-size: 1.1rem;
    font-weight: 500;
    margin: 0.5rem 0;
    min-height: 1.5rem;
}

.publish-details {
    font-size: 0.9rem;
    color: #666;
    margin-top: 0.5rem;
    min-height: 1.2rem;
}

.publish-success .publish-icon {
    color: #10b981;
}

.publish-error .publish-icon {
    color: #ef4444;
}

/* Toast Notifications */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--card-bg);
    color: var(--text-color);
    border-radius: 8px;
    padding: 1rem 1.5rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 1rem;
    z-index: 2000;
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    max-width: 350px;
}

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

.toast-content {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex: 1;
}

.toast i {
    font-size: 1.25rem;
}

.toast-success i {
    color: var(--success-color);
}

.toast-error i {
    color: var(--error-color);
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.25rem;
    margin-left: 0.5rem;
    line-height: 1;
    transition: color 0.2s;
}

.toast-close:hover {
    color: var(--text-color);
}

/* Loading States */
.btn-loading {
    position: relative;
    pointer-events: none;
    color: transparent !important;
}

.btn-loading:after {
    content: '';
    position: absolute;
    width: 1.25rem;
    height: 1.25rem;
    top: 50%;
    left: 50%;
    margin: -0.625rem 0 0 -0.625rem;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 0.8s linear infinite;
}

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

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .landing-hero {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-lg);
    }

    .hero-content {
        max-width: 100%;
        margin: 0 auto;
    }

    .hero-cta {
        justify-content: center;
    }

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

    .hero-image {
        height: 400px;
        margin-top: var(--spacing-xl);
    }
}

@media (max-width: 768px) {
    .navbar {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .main-nav {
        display: none;
    }

    .hero-stats {
        flex-wrap: wrap;
    }

    .hero-image {
        height: 350px;
    }

    .floating-card {
        width: 150px;
        padding: var(--spacing-sm);
    }

    .floating-card i {
        font-size: 1.5rem;
    }

    .floating-card h4 {
        font-size: 0.875rem;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2.5rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-stats {
        gap: var(--spacing-md);
    }

    .stat-number {
        font-size: 1.5rem;
    }

    .hero-image {
        height: 300px;
    }

    .floating-card {
        width: 130px;
    }

    .auth-card {
        width: 95%;
        padding: var(--spacing-md);
    }

    .social-auth {
        grid-template-columns: 1fr;
    }
}

/* Dark mode toggle */
body.dark .theme-toggle-btn i::before {
    content: '\f185'; /* sun icon */
}

body:not(.dark) .theme-toggle-btn i::before {
    content: '\f186'; /* moon icon */
}

.theme-toggle-btn {
    background: #f3f4f6;
    border: none;
    color: #4b5563;
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 10px;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.04);
}

.theme-toggle-btn:hover {
    background: #e5e7eb;
    color: #111827;
    transform: translateY(-1px);
}

.theme-toggle-btn:active {
    transform: translateY(0);
}

.hero-cta {
    display: flex;
    gap: 1.2rem;
    margin: 2.5rem 0 3.5rem;
    flex-wrap: wrap;
}

.hero-cta .primary-btn,
.hero-cta .secondary-btn {
    padding: 0 1.2rem;
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 10px;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    position: relative;
    overflow: hidden;
    z-index: 1;
    min-width: 44px;
    height: 44px;
    white-space: nowrap;
}

.hero-cta .primary-btn {
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    color: white;
    border: none;
    box-shadow: 0 4px 15px rgba(79, 70, 229, 0.25);
}

.hero-cta .primary-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #7c3aed, #4f46e5);
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.hero-cta .primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 70, 229, 0.4);
}

.hero-cta .primary-btn:hover::before {
    opacity: 1;
}

.hero-cta .secondary-btn {
    background: white;
    color: #4f46e5;
    border: 2px solid #e0e7ff;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.hero-cta .secondary-btn:hover {
    background: #f9fafb;
    border-color: #d1d5db;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.06);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #4f46e5, #7c3aed);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: 0.4rem;
    font-family: 'Poppins', sans-serif;
}

.stat-label {
    font-size: 1rem;
    color: #64748b;
    font-weight: 500;
    letter-spacing: 0.3px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    position: relative;
}

.stat-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: -1.5rem;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 60%;
    background: linear-gradient(to bottom, transparent, rgba(99, 102, 241, 0.3), transparent);
}

.student-name-display {
    position: absolute;
    top: 18px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.15rem;
    color: var(--fg);
    font-weight: 700;
    letter-spacing: 0.3px;
    background: rgba(0,0,0,0.18);
    padding: 6px 12px;
    border-radius: 10px;
    backdrop-filter: blur(2px);
    z-index: 12;
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px 12px;
    width: 100%;
    margin: 16px 0 10px 0;
}

.detail-cell {
    background: var(--scoreboard-bg);
    border-radius: 10px;
    padding: 10px 12px;
    box-shadow: 0 1px 4px rgba(0,0,0,0.15);
    font-size: 0.98rem;
}

.detail-cell b { color: var(--accent); }

@media (max-width: 900px) {
    .detail-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
    .detail-grid { grid-template-columns: 1fr; }
}

.landing-root {
    min-height: 100vh;
    background: var(--bg);
    color: var(--fg);
    display: flex;
    flex-direction: column;
}

.navbar {
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    background: var(--sidebar-bg);
    box-shadow: 0 2px 8px rgba(0,0,0,0.18);
}
.brand {
    font-weight: 800;
    font-size: 1.1rem;
    letter-spacing: 0.4px;
}
.nav-actions { display: flex; align-items: center; gap: 10px; }
.landing-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 32px;
    padding: 48px 56px;
    flex: 1;
}
.landing-hero { display:flex; flex-direction:column; justify-content:center; }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(8px);} to { opacity: 1; transform: translateY(0);} }
.landing-hero h1 { font-size: 2rem; margin: 0 0 8px 0; }
.landing-hero p { opacity: 0.88; line-height: 1.6; }
.auth-card {
    background: linear-gradient(180deg, rgba(54,57,63,0.6), rgba(35,39,42,0.95));
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 18px;
    padding: 22px 22px 26px 22px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.35);
    max-width: 480px;
    width: 100%;
    justify-self: end;
    transform: translateY(0);
    transition: transform 0.2s ease-out;
}
.auth-card:hover { transform: translateY(-2px); }
.auth-tabs { display: flex; gap: 10px; margin-bottom: 14px; }
.auth-tab {
    flex: 1; border: none; cursor: pointer; padding: 10px 12px; border-radius: 10px;
    background: var(--sidebar-active); color: var(--fg);
}
.auth-tab.active { background: var(--accent); color: var(--bg); }
.auth-body label { display:block; margin: 8px 2px; opacity: 0.9; }
.auth-body input {
    width: 100%; padding: 10px 12px; border-radius: 10px; border: 1px solid #444;
    background: var(--bg); color: var(--fg);
}
.primary-btn {
    margin-top: 12px; width: 100%; padding: 12px 16px; border-radius: 12px; border: none;
    background: var(--accent); color: var(--bg); cursor: pointer; font-weight: 700;
    box-shadow: 0 6px 16px rgba(0,191,174,0.25);
}
.auth-note { margin-top: 8px; font-size: 0.9rem; opacity: 0.8; }
.auth-body input:focus { border-color: var(--accent); }
@media (max-width: 980px) {
    .landing-content { grid-template-columns: 1fr; }
    .auth-card { justify-self: stretch; }
}