/* PKCERT Cyber Range - Main Stylesheet */

/* ================================
   CSS Variables & Reset
   ================================ */
:root {
    /* Primary Colors */
    --color-primary: #0A192F;
    --color-primary-light: #112240;
    --color-primary-dark: #020C1B;
    
    /* Accent Colors */
    --color-accent: #00B4D8;
    --color-accent-hover: #0096B4;
    --color-accent-glow: rgba(0, 180, 216, 0.3);
    
    /* Status Colors */
    --color-success: #00CC88;
    --color-success-bg: rgba(0, 204, 136, 0.1);
    --color-warning: #F59E0B;
    --color-warning-bg: rgba(245, 158, 11, 0.1);
    --color-danger: #EF4444;
    --color-danger-bg: rgba(239, 68, 68, 0.1);
    
    /* Difficulty Colors */
    --color-easy: #10B981;
    --color-medium: #F59E0B;
    --color-hard: #EF4444;
    --color-expert: #8B5CF6;
    
    /* Text Colors */
    --text-primary: #E6F1FF;
    --text-secondary: #8892B0;
    --text-muted: #5A6785;
    
    /* Background */
    --bg-dark: #0A192F;
    --bg-card: #112240;
    --bg-hover: #1D3557;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Roboto Mono', monospace;
    --font-display: 'Rajdhani', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 50%;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 20px var(--color-accent-glow);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-dropdown: 100;
    --z-modal: 200;
    --z-toast: 300;
    --z-navbar: 400;
    --navbar-height: 140px;
}

/* Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

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

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

img {
    max-width: 100%;
    height: auto;
}

/* ================================
   Navigation
   ================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: rgba(10, 25, 47, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
    z-index: var(--z-navbar);
    transition: all var(--transition-normal);
}

.nav-container {
    max-width: 1400px;
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-primary);
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    flex: 0 0 auto;
}

.logo-icon {
    width: 140px;
    height: 140px;
    color: var(--color-accent);
}

.logo-icon img {
    width: 140px;
    height: 140px;
    object-fit: contain;
    display: block;
}

.logo-text {
    letter-spacing: 1px;
}

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

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    flex: 1 1 auto;
    justify-content: center;
    min-width: 0;
}

.nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
    background: rgba(0, 180, 216, 0.1);
}

.nav-link.active {
    color: var(--color-accent);
}

.nav-actions {
    display: flex;
    gap: var(--spacing-md);
    flex: 0 0 auto;
}

.nav-user {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex: 0 0 auto;
}

.notification-bell {
    position: relative;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-card);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.notification-bell:hover {
    background: var(--bg-hover);
}

.notification-bell svg {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
}

.notification-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    width: 18px;
    height: 18px;
    background: var(--color-danger);
    border-radius: var(--radius-full);
    font-size: 10px;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

.notifications-panel {
    position: absolute;
    top: calc(var(--navbar-height) - 8px);
    right: 120px;
    width: min(380px, calc(100vw - 24px));
    max-height: 440px;
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.15);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: none;
    flex-direction: column;
    z-index: var(--z-dropdown);
    overflow: hidden;
}

.notifications-panel.active {
    display: flex;
}

.notifications-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.notifications-list {
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.notifications-empty {
    color: var(--text-muted);
    padding: var(--spacing-lg);
    text-align: center;
}

.notification-item {
    text-align: left;
    border: none;
    background: transparent;
    color: inherit;
    width: 100%;
    padding: var(--spacing-md);
    border-bottom: 1px solid rgba(100, 255, 218, 0.08);
    cursor: pointer;
}

.notification-item:hover {
    background: rgba(0, 180, 216, 0.08);
}

.notification-item.unread {
    background: rgba(37, 99, 235, 0.12);
}

.notification-item.read {
    opacity: 0.92;
}

.notification-title {
    font-weight: 600;
    margin-bottom: 4px;
}

.notification-message {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.4;
    margin-bottom: 6px;
}

.notification-time {
    color: var(--text-muted);
    font-size: 0.78rem;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.user-menu:hover {
    background: var(--bg-card);
}

.user-avatar {
    width: 36px;
    height: 36px;
    background: linear-gradient(135deg, var(--color-accent), #6366F1);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

.user-name {
    font-weight: 500;
    color: var(--text-primary);
}

.user-dropdown {
    position: absolute;
    top: calc(var(--navbar-height) - 8px);
    right: var(--spacing-xl);
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
    min-width: 200px;
    box-shadow: var(--shadow-lg);
    display: none;
    flex-direction: column;
    animation: slideDown 0.2s ease;
}

.user-dropdown.active {
    display: flex;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.user-dropdown a {
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.user-dropdown a:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.user-dropdown hr {
    border: none;
    height: 1px;
    background: rgba(100, 255, 218, 0.1);
    margin: var(--spacing-sm) 0;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--spacing-sm);
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all var(--transition-fast);
}

/* ================================
   Buttons
   ================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-family: var(--font-primary);
    font-size: 0.9rem;
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-primary-dark);
}

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

.btn-outline {
    background: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
}

.btn-outline:hover {
    background: rgba(0, 180, 216, 0.1);
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

.btn-success {
    background: var(--color-success);
    color: var(--color-primary-dark);
}

.btn-danger {
    background: var(--color-danger);
    color: white;
}

/* ================================
   Pages
   ================================ */
.page {
    display: none;
    min-height: calc(100vh - var(--navbar-height));
    padding-top: var(--navbar-height);
}

.page.active {
    display: block;
}

.page-header {
    background: var(--bg-card);
    padding: var(--spacing-2xl) var(--spacing-xl);
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.page-header h1 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ================================
   Hero Section
   ================================ */
.hero {
    min-height: calc(100vh - 70px);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    padding: var(--spacing-3xl);
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-carousel {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.carousel-slide {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    opacity: 0;
    transform: scale(1.03);
    transition: opacity 1.4s ease-in-out, transform 6s ease-in-out;
}

.carousel-slide.active {
    opacity: 1;
    transform: scale(1);
}

.carousel-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
    background: linear-gradient(135deg, rgba(10, 25, 47, 0.88) 0%, rgba(10, 25, 47, 0.55) 100%);
}

.cyber-grid {
    position: absolute;
    inset: 0;
    z-index: 2;
    background-image: 
        linear-gradient(rgba(0, 180, 216, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 180, 216, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
}

.hero-particles {
    position: absolute;
    inset: 0;
    z-index: 3;
    background: radial-gradient(circle at 50% 50%, rgba(0, 180, 216, 0.1) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 4;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: var(--spacing-2xl) 0;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: rgba(0, 180, 216, 0.1);
    border: 1px solid rgba(0, 180, 216, 0.2);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    color: var(--color-accent);
    margin-bottom: var(--spacing-lg);
    width: fit-content;
}

.badge-icon {
    font-size: 1.2rem;
}

.hero-title {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
}

.hero-title .highlight {
    color: var(--color-accent);
}

.hero-description {
    font-size: 1.15rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 550px;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-3xl);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-2xl);
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-value {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.stat-sub {
    font-size: 0.8rem;
    color: var(--color-accent);
    font-weight: 600;
    margin-top: 2px;
}

.hero-visual {
    position: relative;
    z-index: 4;
    display: flex;
    align-items: center;
    justify-content: center;
}

.terminal-preview {
    width: 100%;
    max-width: 500px;
    background: var(--color-primary-dark);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(0, 180, 216, 0.2);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.terminal-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-card);
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.terminal-dots {
    display: flex;
    gap: 6px;
}

.terminal-dots span {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background: var(--color-danger);
}

.terminal-dots span:nth-child(2) {
    background: var(--color-warning);
}

.terminal-dots span:nth-child(3) {
    background: var(--color-success);
}

.terminal-title {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.terminal-content {
    padding: var(--spacing-lg);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.8;
}

.terminal-line {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xs);
}

.terminal-line.success .output {
    color: var(--color-success);
}

.prompt {
    color: var(--color-accent);
}

.command {
    color: var(--text-primary);
}

.output {
    color: var(--text-secondary);
}

/* ================================
   Features Section
   ================================ */
.features-section {
    padding: var(--spacing-3xl) var(--spacing-xl);
    background: var(--color-primary-dark);
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-3xl);
}

.section-tag {
    display: inline-block;
    background: rgba(0, 180, 216, 0.1);
    color: var(--color-accent);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-xl);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-md);
}

.section-header h2 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.section-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
}

.feature-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: rgba(0, 180, 216, 0.1);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    color: var(--color-accent);
}

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ================================
   Categories Section
   ================================ */
.categories-section {
    padding: var(--spacing-3xl) var(--spacing-xl);
    background: var(--bg-dark);
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.category-card {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.category-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.category-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.category-icon svg {
    width: 32px;
    height: 32px;
}

.category-icon.web {
    background: rgba(59, 130, 246, 0.1);
    color: #3B82F6;
}

.category-icon.forensics {
    background: rgba(139, 92, 246, 0.1);
    color: #8B5CF6;
}

.category-icon.crypto {
    background: rgba(245, 158, 11, 0.1);
    color: #F59E0B;
}

.category-icon.reverse {
    background: rgba(16, 185, 129, 0.1);
    color: #10B981;
}

.category-icon.network {
    background: rgba(239, 68, 68, 0.1);
    color: #EF4444;
}

.category-icon.pwn {
    background: rgba(236, 72, 153, 0.1);
    color: #EC4899;
}

.category-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.category-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
}

.category-count {
    display: inline-block;
    background: rgba(0, 180, 216, 0.1);
    color: var(--color-accent);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 500;
}

/* ================================
   CTA Section
   ================================ */
.cta-section {
    padding: var(--spacing-3xl) var(--spacing-xl);
    background: linear-gradient(135deg, var(--bg-card) 0%, var(--color-primary-light) 100%);
}

.cta-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.cta-content h2 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-2xl);
}

.cta-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.cta-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    color: var(--text-muted);
    font-size: 0.9rem;
}

.cta-note svg {
    width: 18px;
    height: 18px;
    color: var(--color-success);
}

/* ================================
   Challenges Page
   ================================ */
.challenges-container {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.challenges-sidebar {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    height: fit-content;
    position: sticky;
    top: 90px;
}

.filter-section {
    margin-bottom: var(--spacing-xl);
}

.filter-section h3 {
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: var(--spacing-md);
}

.filter-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.filter-option {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 0.9rem;
}

.filter-option:hover {
    background: var(--bg-hover);
}

.filter-option input[type="checkbox"] {
    width: 16px;
    height: 16px;
    accent-color: var(--color-accent);
}

.filter-option.easy span { color: var(--color-easy); }
.filter-option.medium span { color: var(--color-medium); }
.filter-option.hard span { color: var(--color-hard); }
.filter-option.expert span { color: var(--color-expert); }

.challenges-main {
    min-height: 500px;
}

.challenges-header {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.search-box {
    flex: 1;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: var(--radius-md);
    padding: 0 var(--spacing-md);
}

.search-box svg {
    width: 20px;
    height: 20px;
    color: var(--text-muted);
}

.search-box input {
    flex: 1;
    background: none;
    border: none;
    padding: var(--spacing-md) 0;
    font-size: 0.95rem;
    color: var(--text-primary);
    outline: none;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.challenges-sort select {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    font-family: var(--font-primary);
    cursor: pointer;
}

.challenges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.challenge-card {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.challenge-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.challenge-card.solved {
    opacity: 0.7;
}

.challenge-card.solved::after {
    content: 'SOLVED';
    position: absolute;
    top: var(--spacing-md);
    right: calc(var(--spacing-md) * -1);
    background: var(--color-success);
    color: var(--color-primary-dark);
    padding: var(--spacing-xs) var(--spacing-lg);
    font-size: 0.7rem;
    font-weight: 700;
    transform: rotate(45deg);
}

.challenge-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
}

.challenge-category {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--color-accent);
}

.challenge-difficulty {
    font-size: 0.7rem;
    font-weight: 600;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    text-transform: uppercase;
}

.difficulty-easy {
    background: rgba(16, 185, 129, 0.2);
    color: var(--color-easy);
}

.difficulty-medium {
    background: rgba(245, 158, 11, 0.2);
    color: var(--color-medium);
}

.difficulty-hard {
    background: rgba(239, 68, 68, 0.2);
    color: var(--color-hard);
}

.difficulty-expert {
    background: rgba(139, 92, 246, 0.2);
    color: var(--color-expert);
}

.challenge-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.challenge-contributor {
    display: flex;
    align-items: center;
    gap: 6px;
    margin: -2px 0 8px 0;
}

.challenge-contributor-image,
.challenge-contributor-fallback {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    object-fit: cover;
    border: 1px solid rgba(100, 255, 218, 0.28);
    box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.6);
    flex-shrink: 0;
}

.challenge-contributor-fallback {
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 180, 216, 0.18);
    color: var(--color-accent);
    font-size: 0.68rem;
    font-weight: 700;
}

.challenge-contributor-name {
    font-size: 0.76rem;
    color: var(--text-muted);
    line-height: 1.1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 210px;
}

.challenge-description {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-md);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.challenge-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(100, 255, 218, 0.1);
}

.challenge-points {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-warning);
}

.challenge-solves {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.challenge-requires-vm {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.8rem;
    color: var(--color-accent);
}

.challenge-requires-vm svg {
    width: 14px;
    height: 14px;
}

/* ================================
   Challenge Detail Page
   ================================ */
.challenge-detail-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.challenge-detail-header {
    margin-bottom: var(--spacing-xl);
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    background: none;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}

.back-btn:hover {
    color: var(--text-primary);
}

.back-btn svg {
    width: 18px;
    height: 18px;
}

.challenge-detail-content {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-2xl);
}

.challenge-detail-header-info {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.challenge-detail-title {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.challenge-detail-meta {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.challenge-detail-section {
    margin-bottom: var(--spacing-xl);
}

.challenge-detail-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.challenge-detail-description {
    font-size: 1rem;
    line-height: 1.8;
}

.challenge-detail-files {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.file-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--bg-hover);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.85rem;
}

.file-badge svg {
    width: 16px;
    height: 16px;
    color: var(--color-accent);
}

.flag-submission {
    display: flex;
    gap: var(--spacing-md);
}

.flag-input {
    flex: 1;
    background: var(--bg-dark);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--text-primary);
    outline: none;
    transition: border-color var(--transition-fast);
}

.flag-input:focus {
    border-color: var(--color-accent);
}

.flag-input::placeholder {
    color: var(--text-muted);
    font-family: var(--font-primary);
}

.flag-submission .btn {
    min-width: 140px;
}

.vm-controls {
    background: var(--bg-dark);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.vm-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.status-indicator {
    width: 12px;
    height: 12px;
    border-radius: var(--radius-full);
    background: var(--color-danger);
}

.status-indicator.running {
    background: var(--color-success);
    box-shadow: 0 0 10px var(--color-success);
}

.status-indicator.booting {
    background: var(--color-warning);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.vm-info {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.vm-info-item {
    display: flex;
    flex-direction: column;
}

.vm-info-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xs);
}

.vm-info-value {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-primary);
}

.vm-actions {
    display: flex;
    gap: var(--spacing-md);
}

.vm-actions .btn {
    flex: 1;
}

.hints-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(100, 255, 218, 0.1);
}

.hint-item {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.hint-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.hint-cost {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-warning);
}

/* ================================
   Leaderboard Page
   ================================ */
.leaderboard-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.leaderboard-tabs {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.tab-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.tab-btn:hover,
.tab-btn.active {
    background: var(--bg-hover);
    color: var(--text-primary);
    border-color: var(--color-accent);
}

.tab-btn.active {
    color: var(--color-accent);
}

.leaderboard-table-container {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.leaderboard-table {
    width: 100%;
    border-collapse: collapse;
}

.leaderboard-table th,
.leaderboard-table td {
    padding: var(--spacing-md) var(--spacing-lg);
    text-align: left;
}

.leaderboard-table th {
    background: var(--bg-dark);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

.leaderboard-table tr {
    border-bottom: 1px solid rgba(100, 255, 218, 0.05);
    transition: background var(--transition-fast);
}

.leaderboard-table tbody tr:hover {
    background: var(--bg-hover);
}

.leaderboard-table td {
    font-size: 0.95rem;
}

.rank-cell {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    width: 80px;
}

.rank-1 { color: #FFD700; }
.rank-2 { color: #C0C0C0; }
.rank-3 { color: #CD7F32; }

.player-cell {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.player-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-accent), #6366F1);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
}

.player-name {
    font-weight: 500;
}

.player-org {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.score-cell {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--color-warning);
}

.trend-cell {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.85rem;
}

.trend-up { color: var(--color-success); }
.trend-down { color: var(--color-danger); }
.trend-same { color: var(--text-muted); }

/* ================================
   Teams Page
   ================================ */
.teams-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.teams-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.teams-search input {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-primary);
    width: 300px;
    outline: none;
}

.teams-search input:focus {
    border-color: var(--color-accent);
}

.teams-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-lg);
}

.team-card {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    transition: all var(--transition-normal);
}

.team-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
}

.team-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-lg);
}

.team-info h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.team-members-count {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.team-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.team-stat {
    text-align: center;
}

.team-stat-value {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.team-stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.team-members {
    display: flex;
    margin-bottom: var(--spacing-md);
}

.team-member-avatar {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--color-accent), #6366F1);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: -8px;
    border: 2px solid var(--bg-card);
}

.team-member-avatar:first-child {
    margin-left: 0;
}

.team-join-btn {
    width: 100%;
}

/* ================================
   Dashboard Page
   ================================ */
.dashboard-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.dashboard-header {
    margin-bottom: var(--spacing-2xl);
}

.dashboard-header h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.dashboard-header p {
    color: var(--text-secondary);
}

.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.dashboard-stat-card {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.stat-icon {
    width: 56px;
    height: 56px;
    background: rgba(0, 180, 216, 0.1);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.stat-icon svg {
    width: 28px;
    height: 28px;
    color: var(--color-accent);
}

.stat-icon.solved {
    background: rgba(0, 204, 136, 0.1);
}

.stat-icon.solved svg {
    color: var(--color-success);
}

.stat-icon.team {
    background: rgba(139, 92, 246, 0.1);
}

.stat-icon.team svg {
    color: #8B5CF6;
}

.stat-icon.active {
    background: rgba(245, 158, 11, 0.1);
}

.stat-icon.active svg {
    color: var(--color-warning);
}

.stat-info {
    display: flex;
    flex-direction: column;
}

.dashboard-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.dashboard-section {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.dashboard-section h2 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.dashboard-section.full-width {
    grid-column: 1 / -1;
}

.charts-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.chart-box {
    background: var(--bg-dark);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.chart-box h3 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.chart-container {
    position: relative;
}

@media (max-width: 768px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard-content {
        grid-template-columns: 1fr;
    }
}

.activity-timeline {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.activity-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-dark);
    border-radius: var(--radius-md);
}

.activity-icon {
    width: 40px;
    height: 40px;
    background: rgba(0, 204, 136, 0.1);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.activity-icon svg {
    width: 20px;
    height: 20px;
    color: var(--color-success);
}

.activity-content {
    flex: 1;
}

.activity-text {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-xs);
}

.activity-time {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.skill-bars {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.skill-bar-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.skill-bar-header {
    display: flex;
    justify-content: space-between;
}

.skill-bar-label {
    font-size: 0.9rem;
    font-weight: 500;
}

.skill-bar-value {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.skill-bar {
    height: 8px;
    background: var(--bg-dark);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.skill-bar-fill {
    height: 100%;
    background: var(--color-accent);
    border-radius: var(--radius-full);
    transition: width 0.5s ease;
}

.active-vms-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.vm-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg);
    background: var(--bg-dark);
    border-radius: var(--radius-md);
}

.vm-card-info h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.vm-card-info p {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

.vm-card-actions {
    display: flex;
    gap: var(--spacing-md);
}

/* ================================
   Admin Page
   ================================ */
.admin-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.admin-header {
    margin-bottom: var(--spacing-2xl);
}

.admin-header h1 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.admin-header p {
    color: var(--text-secondary);
}

.admin-tabs {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
    padding-bottom: var(--spacing-md);
}

.admin-section {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.admin-section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
}

.admin-section-header h2 {
    font-size: 1.1rem;
    font-weight: 600;
}

.admin-search input {
    background: var(--bg-dark);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--text-primary);
    width: 250px;
    outline: none;
}

.admin-table {
    width: 100%;
    border-collapse: collapse;
}

.admin-table th,
.admin-table td {
    padding: var(--spacing-md);
    text-align: left;
    border-bottom: 1px solid rgba(100, 255, 218, 0.05);
}

.admin-table th {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
}

.admin-table tbody tr:hover {
    background: var(--bg-hover);
}

.action-btns {
    display: flex;
    gap: var(--spacing-sm);
}

.action-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-dark);
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.action-btn:hover {
    color: var(--text-primary);
}

.action-btn.delete:hover {
    background: var(--color-danger-bg);
    color: var(--color-danger);
}

.action-btn svg {
    width: 16px;
    height: 16px;
}

.vm-stats {
    display: flex;
    gap: var(--spacing-xl);
}

.vm-stats span {
    color: var(--text-secondary);
}

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.analytics-card {
    background: var(--bg-dark);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
}

.analytics-card h3 {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: var(--spacing-sm);
}

.analytics-value {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.analytics-trend {
    font-size: 0.85rem;
}

.analytics-trend.positive {
    color: var(--color-success);
}

.analytics-trend.negative {
    color: var(--color-danger);
}

/* ================================
   About Page
   ================================ */
.about-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-2xl);
}

.about-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
}

.about-header h1 {
    font-family: var(--font-display);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.about-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.about-section {
    margin-bottom: var(--spacing-3xl);
}

.about-section h2 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.about-section p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-lg);
}

.offer-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.offer-card {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
}

.offer-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.offer-card p {
    font-size: 0.95rem;
    margin-bottom: 0;
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-secondary);
}

.feature-list li::before {
    content: '✓';
    color: var(--color-success);
    font-weight: bold;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    color: var(--text-secondary);
}

.contact-item svg {
    width: 24px;
    height: 24px;
    color: var(--color-accent);
}

/* ================================
   Profile Page
   ================================ */
.profile-container {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-2xl);
}

.profile-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
    border-bottom: 1px solid rgba(100, 255, 218, 0.1);
}

.profile-avatar-large {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--color-accent), #6366F1);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    font-weight: 700;
}

.profile-info h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.profile-info p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.profile-role {
    display: inline-block;
    background: rgba(0, 180, 216, 0.1);
    color: var(--color-accent);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    font-weight: 500;
}

.profile-section {
    margin-bottom: var(--spacing-2xl);
}

.profile-section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.profile-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.profile-stat {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
}

.profile-stat .stat-value {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.profile-stat .stat-label {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.solved-challenges {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.solved-challenge {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md);
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.1);
    border-radius: var(--radius-md);
}

.solved-challenge-info h4 {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.solved-challenge-info p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.solved-challenge-points {
    font-family: var(--font-mono);
    font-weight: 600;
    color: var(--color-warning);
}

/* ================================
   Modals
   ================================ */
.modal {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal);
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding: calc(var(--navbar-height) + var(--spacing-md)) var(--spacing-xl) var(--spacing-xl);
}

.modal.active {
    display: flex;
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(2, 12, 27, 0.9);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    max-width: 450px;
    width: 100%;
    max-height: calc(100vh - var(--navbar-height) - (var(--spacing-xl) * 2));
    overflow-y: auto;
    animation: modalSlide 0.3s ease;
}

.modal-large {
    max-width: 700px;
}

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

.modal-close {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 32px;
    height: 32px;
    background: var(--bg-dark);
    border: none;
    border-radius: var(--radius-full);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

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

.modal-close svg {
    width: 18px;
    height: 18px;
}

.modal-content h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.modal-content > p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    background: var(--bg-dark);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    outline: none;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-hint {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

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

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.9rem;
    cursor: pointer;
}

.checkbox-label input {
    width: 16px;
    height: 16px;
    accent-color: var(--color-accent);
}

.forgot-link {
    font-size: 0.9rem;
}

.modal-footer {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(100, 255, 218, 0.1);
    color: var(--text-secondary);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

/* ================================
   Toast Notifications
   ================================ */
.toast-container {
    position: fixed;
    top: 190px;
    right: var(--spacing-xl);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.toast {
    background: var(--bg-card);
    border: 1px solid rgba(100, 255, 218, 0.2);
    border-radius: var(--radius-md);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-width: 300px;
    box-shadow: var(--shadow-lg);
    animation: toastSlide 0.3s ease;
}

@keyframes toastSlide {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

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

.toast.warning {
    border-color: var(--color-warning);
}

.toast-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

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

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

.toast.warning .toast-icon {
    color: var(--color-warning);
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.toast-message {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: var(--spacing-xs);
}

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

/* ================================
   Footer
   ================================ */
.footer {
    background: var(--color-primary-dark);
    border-top: 1px solid rgba(100, 255, 218, 0.1);
    padding: var(--spacing-3xl) var(--spacing-xl) var(--spacing-xl);
}

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

.footer-main {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--spacing-3xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
}

.footer-logo svg {
    width: 32px;
    height: 32px;
    color: var(--color-accent);
}

.footer-logo img {
    width:90px;
    height:90px;
    object-fit: contain;
    display: block;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.footer-column h4 {
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
}

.footer-column a {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-fast);
}

.footer-column a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(100, 255, 218, 0.1);
}

.footer-bottom p {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-badges {
    display: flex;
    gap: var(--spacing-md);
}

.footer-badges .badge {
    background: rgba(0, 180, 216, 0.1);
    color: var(--color-accent);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-xl);
    font-size: 0.75rem;
    font-weight: 500;
}

/* ================================
   Responsive Design
   ================================ */
@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .categories-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .dashboard-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .analytics-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 992px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding: var(--spacing-2xl);
    }
    
    .hero-description {
        margin: 0 auto var(--spacing-2xl);
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-visual {
        display: none;
    }
    
    .challenges-container {
        grid-template-columns: 1fr;
    }
    
    .challenges-sidebar {
        position: static;
    }
    
    .footer-main {
        grid-template-columns: 1fr;
    }
    
    .offer-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --navbar-height: 96px;
    }

    .nav-container {
        padding: 0 var(--spacing-md);
    }

    .logo-icon,
    .logo-icon img {
        width: 86px;
        height: 86px;
    }

    .nav-links {
        display: none;
    }
    
    .nav-actions {
        display: none;
    }
    
    .nav-user {
        display: none;
    }
    
    .mobile-menu-btn {
        display: flex;
    }

    .modal {
        padding: calc(var(--navbar-height) + var(--spacing-sm)) var(--spacing-md) var(--spacing-md);
    }

    .modal-content {
        max-height: calc(100vh - var(--navbar-height) - (var(--spacing-md) * 2));
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-actions {
        flex-direction: column;
    }
    
    .challenges-header {
        flex-direction: column;
    }
    
    .challenges-grid {
        grid-template-columns: 1fr;
    }
    
    .dashboard-content {
        grid-template-columns: 1fr;
    }
    
    .profile-stats {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-links {
        grid-template-columns: 1fr 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: var(--spacing-lg);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        padding: var(--spacing-lg);
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

.mt-1 { margin-top: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-lg); }
.mt-3 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-md); }
.mb-2 { margin-bottom: var(--spacing-lg); }
.mb-3 { margin-bottom: var(--spacing-xl); }

/* File Upload Styling */
.file-upload-container {
    border: 1px dashed var(--border);
    padding: 1rem;
    border-radius: 4px;
    background: rgba(0,0,0,0.2);
}
.file-input {
    width: 100%;
    color: var(--text-muted);
}

/* Hint Row Styling */
.hint-row {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}
.hint-row input[type="text"] {
    flex: 1;
}
.hint-row input[type="number"] {
    width: 80px;
}
.answer-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
    margin-bottom: 10px;
}
.answer-row input {
    min-width: 0;
}
.btn-sm {
    padding: 2px 8px;
    font-size: 0.8rem;
    height: 38px; /* Match input height */
}

@media (max-width: 768px) {
    .answer-row {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .notifications-panel {
        right: 8px;
        top: calc(var(--navbar-height) - 8px);
        width: calc(100vw - 16px);
    }
}