/* ===================================
   CodeArena - Modern Coding Contest Platform
   Created by Helium AI
   =================================== */

/* CSS Variables for Dynamic Theming */
:root {
    /* Primary Colors - Deep Navy & Vibrant Orange */
    --primary-color: #1da7f1ff;
    --primary-dark: #2d2ae8;
    --primary-light: #1724b1;
    
    --secondary-color: #1E3A8A;
    --secondary-dark: #1E40AF;
    --secondary-light: #3B82F6;
    
    /* Accent Colors */
    --accent-teal: #14B8A6;
    --accent-purple: #8B5CF6;
    --accent-green: #10B981;
    --accent-red: #EF4444;
    
    /* Neutral Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --bg-tertiary: #F1F5F9;
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-tertiary: #94A3B8;
    --border-color: #E2E8F0;
    
    /* 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
}

/* Dark Mode Variables */
[data-theme="dark"] {
    --bg-primary: #0F172A;
    --bg-secondary: #1E293B;
    --bg-tertiary: #334155;
    --text-primary: #F1F5F9;
    --text-secondary: #CBD5E1;
    --text-tertiary: #64748B;
    --border-color: #334155;
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
}

/* ===================================
   Reset & Base Styles
   =================================== */

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* ===================================
   Typography
   =================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.875rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-sm);
}

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

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

/* ===================================
   Container & Layout
   =================================== */

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.page {
    display: none;
    min-height: calc(100vh - 80px);
    padding-top: 80px;
    animation: fadeIn 0.3s ease;
}

.page.active {
    display: block;
}

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

/* ===================================
   Navigation
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all var(--transition-base);
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

[data-theme="dark"] .navbar {
    background: rgba(15, 23, 42, 0.95);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

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

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--text-primary);
    cursor: pointer;
}

.brand-icon {
    width: 32px;
    height: 32px;
    color: var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    color: var(--text-primary);
}

.mobile-menu-toggle svg {
    width: 24px;
    height: 24px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    color: var(--text-secondary);
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link svg {
    width: 18px;
    height: 18px;
}

.nav-link:hover {
    color: var(--primary-color);
    background: var(--bg-secondary);
}

.nav-link.active {
    color: var(--primary-color);
    background: var(--bg-secondary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-left: var(--spacing-md);
}

.theme-toggle {
    background: var(--bg-secondary);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
    transform: rotate(15deg);
}

.theme-toggle svg {
    width: 20px;
    height: 20px;
}

/* ===================================
   Buttons
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    font-family: var(--font-sans);
}

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

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--text-tertiary);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

.btn-social {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    flex: 1;
}

.btn-social:hover {
    background: var(--bg-tertiary);
}

/* ===================================
   Hero Section
   =================================== */

.hero {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-text {
    animation: slideInLeft 0.6s ease;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.hero-title {
    font-size: 3.5rem;
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

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

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

.stat-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.stat-item svg {
    width: 32px;
    height: 32px;
    color: var(--primary-color);
}

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

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.hero-visual {
    animation: slideInRight 0.6s ease;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.code-window {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-color);
}

.code-window-header {
    background: var(--bg-tertiary);
    padding: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-bottom: 1px solid var(--border-color);
}

.window-dots {
    display: flex;
    gap: 0.5rem;
}

.window-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--text-tertiary);
}

.window-dots span:nth-child(1) { background: #EF4444; }
.window-dots span:nth-child(2) { background: #F59E0B; }
.window-dots span:nth-child(3) { background: #10B981; }

.window-title {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.code-window-content {
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.6;
    overflow-x: auto;
}

.code-window-content pre {
    margin: 0;
}

.code-keyword { color: #C678DD; }
.code-string { color: #98C379; }
.code-function { color: #61AFEF; }
.code-comment { color: #5C6370; font-style: italic; }
.code-number { color: #D19A66; }

/* ===================================
   Features Section
   =================================== */

.features-section {
    padding: var(--spacing-xl) 0;
}

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

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.feature-card {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.feature-icon svg {
    width: 32px;
    height: 32px;
    color: white;
}

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

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* ===================================
   Contests Section
   =================================== */

.upcoming-contests-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-secondary);
}

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

.contest-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
    cursor: pointer;
}

.contest-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.contest-header {
    padding: var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
}

.contest-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.contest-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 0.875rem;
    opacity: 0.9;
}

.contest-meta svg {
    width: 16px;
    height: 16px;
}

.contest-body {
    padding: var(--spacing-md);
}

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

.contest-tags {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.tag {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
}

.tag-easy {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
}

.tag-medium {
    background: rgba(245, 158, 11, 0.1);
    color: #F59E0B;
}

.tag-hard {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-red);
}

.tag-upcoming {
    background: rgba(59, 130, 246, 0.1);
    color: var(--secondary-light);
}

.tag-ongoing {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
}

.tag-completed {
    background: rgba(148, 163, 184, 0.1);
    color: var(--text-tertiary);
}

.contest-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.contest-participants {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.contest-participants svg {
    width: 16px;
    height: 16px;
}

.section-footer {
    text-align: center;
    margin-top: var(--spacing-xl);
}

/* ===================================
   Page Header
   =================================== */

.page-header {
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    font-size: 1.25rem;
    color: var(--text-secondary);
}

/* ===================================
   About Page
   =================================== */

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

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

.about-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-xl);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.about-icon svg {
    width: 40px;
    height: 40px;
    color: white;
}

.about-section h2 {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.about-section p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.8;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.step-card {
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.step-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto var(--spacing-md);
}

.step-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

.step-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

.eligibility-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.eligibility-card {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
}

.eligibility-card svg {
    width: 24px;
    height: 24px;
    color: var(--accent-green);
    flex-shrink: 0;
}

.eligibility-card h3 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.eligibility-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.language-badge {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    font-weight: 600;
    transition: all var(--transition-fast);
}

.language-badge:hover {
    background: var(--bg-tertiary);
    border-color: var(--primary-color);
}

.language-badge svg {
    width: 20px;
    height: 20px;
    color: var(--primary-color);
}

/* ===================================
   Contests Filters
   =================================== */

.contests-filters {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.filter-group {
    flex: 1;
    min-width: 200px;
}

.filter-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.filter-group label svg {
    width: 18px;
    height: 18px;
}

.filter-select,
.filter-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.filter-select:focus,
.filter-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

/* ===================================
   Contest Details
   =================================== */

.contest-details-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
}

.contest-details-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

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

.meta-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.meta-item svg {
    width: 20px;
    height: 20px;
}

.contest-details-body {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
}

.problem-section {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.problem-section h2 {
    margin-bottom: var(--spacing-md);
}

.problem-section h3 {
    font-size: 1.25rem;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.problem-section p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.sample-case {
    background: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.sample-case h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.sample-case pre {
    font-family: var(--font-mono);
    background: var(--bg-primary);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    overflow-x: auto;
}

.compiler-section {
    position: sticky;
    top: 100px;
}

.compiler-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.compiler-header {
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.compiler-header h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
}

.language-selector {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
}

.compiler-body {
    padding: var(--spacing-md);
}

.code-editor {
    width: 100%;
    min-height: 300px;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    resize: vertical;
}

.compiler-actions {
    display: flex;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.compiler-output {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    white-space: pre-wrap;
    max-height: 200px;
    overflow-y: auto;
}

/* ===================================
   Create Contest Form
   =================================== */

.create-contest-form {
    max-width: 900px;
    margin: 0 auto;
}

.form-section {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
}

.form-section h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--border-color);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

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

.form-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.form-group label svg {
    width: 18px;
    height: 18px;
    color: var(--primary-color);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1rem;
    transition: all var(--transition-fast);
}

.form-group textarea {
    resize: vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(255, 107, 53, 0.1);
}

.test-case-item {
    background: var(--bg-tertiary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

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

/* ===================================
   Leaderboard
   =================================== */

.leaderboard-filters {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.filter-btn {
    padding: 0.75rem 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.filter-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.leaderboard-table {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

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

.leaderboard-table th {
    background: var(--bg-tertiary);
    padding: var(--spacing-md);
    text-align: left;
    font-weight: 700;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

.leaderboard-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
}

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

.rank-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.125rem;
}

.rank-1 {
    background: linear-gradient(135deg, #FFD700 0%, #FFA500 100%);
    color: white;
}

.rank-2 {
    background: linear-gradient(135deg, #C0C0C0 0%, #A8A8A8 100%);
    color: white;
}

.rank-3 {
    background: linear-gradient(135deg, #CD7F32 0%, #B87333 100%);
    color: white;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
}

.user-name {
    font-weight: 600;
}

.score-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    color: white;
    border-radius: var(--radius-sm);
    font-weight: 700;
}

/* ===================================
   Rules Page
   =================================== */

.rules-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.rule-section {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    margin-bottom: var(--spacing-lg);
}

.rule-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.rule-icon svg {
    width: 32px;
    height: 32px;
    color: white;
}

.rule-section h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-md);
}

.rule-section ul {
    list-style: none;
    padding: 0;
}

.rule-section li {
    padding: var(--spacing-sm) 0;
    padding-left: var(--spacing-lg);
    position: relative;
    color: var(--text-secondary);
    line-height: 1.6;
}

.rule-section li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

/* ===================================
   Auth Pages
   =================================== */

.auth-container {
    max-width: 500px;
    margin: var(--spacing-xl) auto;
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-xl);
}

.auth-tabs {
    display: flex;
    background: var(--bg-tertiary);
}

.auth-tab {
    flex: 1;
    padding: var(--spacing-md);
    background: none;
    border: none;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    border-bottom: 3px solid transparent;
}

.auth-tab.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    background: var(--bg-secondary);
}

.auth-content {
    padding: var(--spacing-xl);
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.auth-form h2 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.auth-form > p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

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

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    color: var(--text-secondary);
}

.checkbox-label input[type="checkbox"] {
    width: auto;
}

.link {
    color: var(--primary-color);
    font-weight: 600;
}

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

.auth-divider {
    text-align: center;
    margin: var(--spacing-lg) 0;
    position: relative;
}

.auth-divider::before,
.auth-divider::after {
    content: "";
    position: absolute;
    top: 50%;
    width: 40%;
    height: 1px;
    background: var(--border-color);
}

.auth-divider::before {
    left: 0;
}

.auth-divider::after {
    right: 0;
}

.auth-divider span {
    background: var(--bg-secondary);
    padding: 0 var(--spacing-sm);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.social-login {
    display: flex;
    gap: var(--spacing-sm);
}

/* ===================================
   CONTACT SECTION
   =================================== */
.contact-section {
    padding: var(--spacing-xl) 0;
    background: var(--bg-primary);
}

.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-xl);
    align-items: start;
}

/* Left Side - Contact Info */
.contact-info-side {
    padding: var(--spacing-lg);
}

.contact-label {
    display: inline-block;
    color: var(--primary-color);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

.contact-title {
    font-size: 2.5rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

.contact-description {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-xl);
}

.contact-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.contact-detail-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.detail-icon {
    width: 48px;
    height: 48px;
    background: rgba(29, 167, 241, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.detail-icon i {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

.detail-content h4 {
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.detail-content p,
.detail-content a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 0;
}

.detail-content a:hover {
    color: var(--primary-color);
}

.social-icons {
    display: flex;
    gap: var(--spacing-sm);
}

.social-icon {
    width: 48px;
    height: 48px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
}

.social-icon:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.social-icon i {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
}

.social-icon:hover i {
    color: white;
}

/* Right Side - Contact Form */
.contact-form-side {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

.modern-contact-form .form-field {
    margin-bottom: var(--spacing-md);
}

.modern-contact-form label {
    display: block;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.modern-contact-form input,
.modern-contact-form textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-family: var(--font-sans);
    transition: all var(--transition-base);
}

.modern-contact-form input::placeholder,
.modern-contact-form textarea::placeholder {
    color: var(--text-tertiary);
}

.modern-contact-form input:focus,
.modern-contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(29, 167, 241, 0.1);
}

.modern-contact-form textarea {
    resize: vertical;
    min-height: 120px;
}

.modern-contact-form .error-message {
    display: none;
    color: var(--accent-red);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.modern-contact-form .form-field.error input,
.modern-contact-form .form-field.error textarea {
    border-color: var(--accent-red);
}

.modern-contact-form .form-field.error .error-message {
    display: block;
}

.submit-btn {
    width: 100%;
    padding: 1rem 1.5rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: all var(--transition-base);
    margin-top: var(--spacing-md);
}

.submit-btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(29, 167, 241, 0.3);
}

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

.submit-btn i {
    width: 20px;
    height: 20px;
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* Responsive Contact Section */
@media (max-width: 968px) {
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .contact-info-side {
        padding: 0;
    }
}

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

.contact-form-container {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.contact-form-container:hover {
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

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

.contact-form label {
    display: block;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95rem;
}

.contact-form .input-with-icon {
    position: relative;
}

.contact-form .input-with-icon i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
    pointer-events: none;
}

.contact-form .form-input {
    width: 100%;
    padding: 0.875rem 1rem 0.875rem 3rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: all var(--transition-base);
}

.contact-form .form-textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: var(--font-sans);
    resize: vertical;
    transition: all var(--transition-base);
}

.contact-form .form-input:focus,
.contact-form .form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(29, 167, 241, 0.1);
}

.contact-form .btn-block {
    margin-top: var(--spacing-md);
}

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

.contact-card {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.contact-icon {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
}

.contact-icon i {
    width: 28px;
    height: 28px;
    color: white;
}

.contact-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-size: 1.25rem;
}

.contact-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    font-size: 0.95rem;
}

.contact-card a {
    color: var(--primary-color);
    font-weight: 600;
    transition: color var(--transition-fast);
}

.contact-card a:hover {
    color: var(--secondary-color);
}

.contact-card .btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

/* ===================================
   Footer
   =================================== */

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: var(--spacing-xl) 0 var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
}

.footer-brand svg {
    width: 28px;
    height: 28px;
    color: var(--primary-color);
}

.footer-section p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-links a {
    width: 40px;
    height: 40px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.social-links a:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.social-links svg {
    width: 20px;
    height: 20px;
}

.footer-section h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

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

.footer-section li {
    margin-bottom: var(--spacing-xs);
}

.footer-section a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .contest-details-body {
        grid-template-columns: 1fr;
    }
    
    .compiler-section {
        position: static;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: var(--bg-primary);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
        border-bottom: 1px solid var(--border-color);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .nav-actions {
        margin-left: 0;
        width: 100%;
        justify-content: space-between;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }
    
    .contests-filters {
        flex-direction: column;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .page-header h1 {
        font-size: 2rem;
    }
    
    .contests-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .btn-lg {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Utility Classes
   =================================== */

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

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }

/* ===================================
   Loading & Animations
   =================================== */

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

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Loading Spinner Animation */
@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.spin {
    animation: spin 1s linear infinite;
}

/* ===================================
   CODE CHALLENGE PAGE STYLES
   =================================== */

/* Round Header */
.round-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.round-info h1 {
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.round-meta-info {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.meta-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-primary);
    border-radius: 20px;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.meta-badge i {
    width: 16px;
    height: 16px;
}

/* Language Selection */
.language-selection-section {
    padding: var(--spacing-xl) 0;
}

.selection-card {
    background: var(--bg-secondary);
    padding: var(--spacing-xl);
    border-radius: 16px;
    border: 1px solid var(--border-color);
}

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

.selection-header i {
    width: 64px;
    height: 64px;
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
}

.selection-header h2 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.selection-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
}

.languages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.language-option {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 2px solid var(--border-color);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
}

.language-option:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.language-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.language-option h3 {
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    font-size: 1.125rem;
}

.language-option p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin: 0;
}

/* Coding Challenge Layout */
.coding-challenge-section {
    padding: var(--spacing-lg) 0;
}

.challenge-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    min-height: calc(100vh - 300px);
}

/* Problem Panel */
.problem-panel {
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md);
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.panel-header h2,
.panel-header h3 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1.25rem;
}

.problem-content {
    padding: var(--spacing-lg);
    overflow-y: auto;
    flex: 1;
}

.problem-header {
    margin-bottom: var(--spacing-lg);
}

.problem-header h2 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.problem-tags {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.problem-section {
    margin-bottom: var(--spacing-lg);
}

.problem-section h3 {
    color: var(--primary-color);
    margin-bottom: var(--spacing-sm);
    font-size: 1.125rem;
}

.problem-section p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.problem-section ul {
    list-style: none;
    padding-left: 0;
}

.problem-section li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
}

.problem-section li::before {
    content: '•';
    color: var(--primary-color);
    font-weight: bold;
    font-size: 1.25rem;
}

.example-case {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.example-case h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.example-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

.example-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
}

.example-box strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.example-box pre {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.75rem;
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-primary);
    overflow-x: auto;
}

.example-explanation {
    color: var(--text-secondary);
    font-style: italic;
    margin: 0;
}

/* Editor Panel */
.editor-panel {
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* Buggy Code Section */
.buggy-code-section {
    background: rgba(239, 68, 68, 0.05);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: 12px;
    padding: var(--spacing-lg);
    margin: var(--spacing-lg) 0;
}

.buggy-code-section h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--accent-red);
    margin-bottom: var(--spacing-sm);
}

.buggy-code-section h3 i {
    width: 24px;
    height: 24px;
}

.buggy-code-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-style: italic;
}

.buggy-code-container {
    background: var(--bg-primary);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.code-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.code-language {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-primary);
    font-weight: 600;
}

.code-status {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    color: var(--accent-red);
    font-size: 0.875rem;
    font-weight: 600;
}

.code-status i {
    width: 16px;
    height: 16px;
}

.buggy-code {
    margin: 0;
    padding: 1.5rem;
    background: var(--bg-primary);
    overflow-x: auto;
    user-select: text;
    cursor: not-allowed;
}

.buggy-code code {
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-primary);
    display: block;
    white-space: pre;
}

/* Make buggy code clearly non-editable */
.buggy-code::before {
    content: '⚠️ READ ONLY - DO NOT EDIT';
    display: block;
    color: var(--accent-red);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 1rem;
    padding: 0.5rem;
    background: rgba(239, 68, 68, 0.1);
    border-radius: 4px;
    text-align: center;
}

/* Language Note Styling */
.language-note {
    background: rgba(59, 130, 246, 0.1);
    border-left: 4px solid var(--info);
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
    display: flex;
    gap: 0.75rem;
}

.language-note i {
    width: 20px;
    height: 20px;
    color: var(--info);
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.language-note p {
    margin: 0;
    color: var(--text-secondary);
    font-style: italic;
}

/* Format Example Styling */
.format-example {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    margin-top: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color: var(--text-primary);
    overflow-x: auto;
}

.editor-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.editor-body {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.code-editor {
    width: 100%;
    height: 500px;
    padding: var(--spacing-md);
    background: var(--bg-primary);
    color: var(--text-primary);
    border: none;
    font-family: var(--font-mono);
    font-size: 0.95rem;
    line-height: 1.6;
    resize: none;
    outline: none;
}

.code-editor:focus {
    background: var(--bg-primary);
}

/* Output Panel */
.output-panel {
    border-top: 1px solid var(--border-color);
    background: var(--bg-tertiary);
}

.output-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.output-header h4 {
    margin: 0;
    color: var(--text-primary);
    font-size: 1rem;
}

.btn-icon {
    background: none;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-icon i {
    width: 18px;
    height: 18px;
}

.code-output {
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--text-primary);
    background: var(--bg-primary);
    margin: 0;
    max-height: 200px;
    overflow-y: auto;
    white-space: pre-wrap;
}

/* Responsive Layout */
@media (max-width: 1024px) {
    .challenge-layout {
        grid-template-columns: 1fr;
    }
    
    .problem-panel {
        max-height: 400px;
    }
}

@media (max-width: 768px) {
    .round-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .languages-grid {
        grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    }
    
    .example-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   MODALS
   =================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    max-width: 900px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.3s ease;
}

.modal-small {
    max-width: 500px;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
    margin: 0;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-secondary);
    transition: all var(--transition-base);
}

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

.modal-close i {
    width: 24px;
    height: 24px;
}

.modal-body {
    padding: var(--spacing-lg);
}

/* ===================================
   ROUNDS GRID
   =================================== */
.rounds-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.round-card {
    background: var(--bg-primary);
    padding: var(--spacing-lg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-base);
    text-align: center;
}

.round-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.round-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
}

.round-icon i {
    width: 40px;
    height: 40px;
    color: white;
}

.round-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.round-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--spacing-md);
}

.round-meta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.round-difficulty {
    padding: 0.375rem 0.875rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.round-difficulty.easy {
    background: rgba(16, 185, 129, 0.1);
    color: var(--accent-green);
}

.round-difficulty.medium {
    background: rgba(245, 158, 11, 0.1);
    color: #F59E0B;
}

.round-difficulty.hard {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-red);
}

.round-status {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    color: var(--text-tertiary);
    font-size: 0.875rem;
}

.round-status i {
    width: 16px;
    height: 16px;
}

/* ===================================
   PASSWORD MODAL
   =================================== */
.password-instruction {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.input-with-icon {
    position: relative;
}

.input-with-icon i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
    pointer-events: none;
}

.input-with-icon .form-input {
    padding-left: 3rem;
}

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

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(29, 167, 241, 0.1);
}

.error-message {
    color: var(--accent-red);
    font-size: 0.875rem;
    margin-top: 0.5rem;
}

/* ===================================
   Print Styles
   =================================== */

@media print {
    .navbar,
    .footer,
    .btn,
    .filter-btn {
        display: none;
    }
    
    .page {
        display: block !important;
        padding-top: 0;
    }
}