/* CTF Platform Public Styles */
:root {
    --primary: #3498db;
    --primary-dark: #2980b9;
    --success: #2ecc71;
    --success-dark: #27ae60;
    --warning: #f39c12;
    --warning-dark: #d68910;
    --danger: #e74c3c;
    --danger-dark: #c0392b;
    --info: #17a2b8;
    --dark: #2c3e50;
    --darker: #1a252f;
    --light: #ecf0f1;
    --gray: #95a5a6;
    --bg-primary: #1a1a2e;
    --bg-secondary: #16213e;
    --bg-card: #16213e;
    --border-color: rgba(255,255,255,0.1);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: #eee;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

/* Navbar */
.navbar {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
    position: relative;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 600;
    color: #fff;
}

.nav-brand i {
    color: var(--primary);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 1.3rem;
    cursor: pointer;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 5px;
    list-style: none;
}

.nav-menu a {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 15px;
    color: #aaa;
    border-radius: 6px;
    transition: all 0.3s;
}

.nav-menu a:hover,
.nav-menu a.active {
    color: #fff;
    background: rgba(52, 152, 219, 0.2);
}

.btn-nav-primary {
    background: var(--primary) !important;
    color: #fff !important;
}

.btn-nav-primary:hover {
    background: var(--primary-dark) !important;
}

/* Nav Dropdown */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    cursor: pointer;
    user-select: none;
}

.nav-menu .nav-dropdown-menu {
    display: none;
    position: absolute;
    top: calc(100% + 5px);
    right: 0;
    left: auto;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    min-width: 200px;
    padding: 8px 0;
    margin: 0;
    list-style: none;
    z-index: 1001;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
}

.nav-dropdown.open > .nav-dropdown-menu,
.nav-dropdown:hover > .nav-dropdown-menu {
    display: flex !important;
}

.nav-dropdown-menu li {
    width: 100%;
    display: block;
}

.nav-dropdown-menu li a {
    display: flex !important;
    align-items: center;
    gap: 10px;
    padding: 10px 15px !important;
    color: #ccc;
    transition: all 0.2s;
    width: 100%;
    white-space: nowrap;
    background: transparent;
    border-radius: 0;
}

.nav-dropdown-menu li a:hover {
    background: rgba(52, 152, 219, 0.2) !important;
    color: #fff;
}

.nav-dropdown-menu li a i {
    width: 18px;
    text-align: center;
    color: var(--primary);
}

.nav-dropdown-menu .dropdown-divider {
    height: 1px;
    background: var(--border-color);
    margin: 8px 0;
    padding: 0;
}

/* Main Container */
.main-container {
    flex: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
    width: 100%;
}

/* Footer */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 20px 0;
    margin-top: auto;
}

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

.footer-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 15px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
    color: #fff;
}

.footer-brand i {
    color: var(--primary);
}

.footer p {
    color: #aaa;
    font-size: 0.9rem;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 60px 20px;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    border-radius: 15px;
    margin-bottom: 40px;
    border: 1px solid var(--border-color);
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.hero h1 i {
    color: var(--primary);
    margin-right: 10px;
}

.hero p {
    color: #aaa;
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 30px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

/* Stats Section */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: 10px;
    padding: 25px;
    text-align: center;
    border: 1px solid var(--border-color);
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card i {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.stat-card.users i { color: var(--primary); }
.stat-card.challenges i { color: var(--success); }
.stat-card.competitions i { color: var(--warning); }
.stat-card.solves i { color: #9b59b6; }

.stat-card h3 {
    font-size: 2rem;
    margin-bottom: 5px;
}

.stat-card p {
    color: #aaa;
}

/* Section Headers */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 15px;
}

.section-header h2 {
    font-size: 1.5rem;
}

.section-header h2 i {
    color: var(--primary);
    margin-right: 10px;
}

/* Cards */
.card {
    background: var(--bg-card);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    overflow: hidden;
}

.card-header {
    padding: 15px 20px;
    border-bottom: 1px solid var(--border-color);
}

.card-body {
    padding: 20px;
}

/* Challenge Cards */
.challenges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.challenge-card {
    background: var(--bg-card);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
    text-decoration: none;
    color: inherit;
    display: block;
}

.challenge-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    color: inherit;
}

.challenge-card-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.challenge-card-header h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.challenge-meta {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.challenge-card-body {
    padding: 20px;
}

.challenge-card-body p {
    color: #aaa;
    font-size: 0.95rem;
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.challenge-stats {
    display: flex;
    justify-content: space-between;
    color: #aaa;
    font-size: 0.9rem;
}

.challenge-stats span i {
    margin-right: 5px;
}

.challenge-card-footer {
    padding: 12px 20px;
    border-top: 1px solid var(--border-color);
}

/* Competition Cards */
.competitions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 20px;
}

.competition-card {
    background: var(--bg-card);
    border-radius: 10px;
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
}

.competition-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.competition-card-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.competition-card-header h3 {
    font-size: 1.2rem;
}

.competition-card-body {
    padding: 20px;
}

.competition-card-body p {
    color: #aaa;
    font-size: 0.95rem;
    margin-bottom: 15px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.competition-info {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 15px;
}

.competition-info span {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #aaa;
    font-size: 0.9rem;
}

.competition-info span i {
    width: 20px;
    color: var(--primary);
}

.competition-card-footer {
    padding: 15px 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Badges */
.badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge.easy { background: var(--success); color: #fff; }
.badge.medium { background: var(--warning); color: #000; }
.badge.hard { background: var(--danger); color: #fff; }
.badge.insane { background: #9b59b6; color: #fff; }
.badge.active { background: var(--success); color: #fff; }
.badge.upcoming { background: var(--info); color: #fff; }
.badge.ended { background: var(--gray); color: #fff; }
.badge.live { background: var(--danger); color: #fff; animation: pulse 2s infinite; }

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* Category Badges */
.category-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
    color: #fff;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s;
    text-decoration: none;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: var(--success-dark); color: #fff; }
.btn-warning { background: var(--warning); color: #fff; }
.btn-warning:hover { background: var(--warning-dark); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: var(--danger-dark); color: #fff; }
.btn-secondary { background: #4a5568; color: #fff; }
.btn-secondary:hover { background: #2d3748; color: #fff; }
.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}
.btn-outline:hover {
    background: var(--primary);
    color: #fff;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
}

.btn-lg {
    padding: 12px 30px;
    font-size: 1rem;
}

/* Filters */
.filters {
    display: flex;
    gap: 15px;
    margin-bottom: 25px;
    flex-wrap: wrap;
    align-items: center;
}

.filter-group {
    display: flex;
    gap: 5px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    color: #aaa;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.85rem;
}

.filter-btn:hover,
.filter-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.search-box {
    display: flex;
    gap: 10px;
    flex: 1;
    min-width: 200px;
}

.search-box input {
    flex: 1;
    padding: 10px 15px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: #fff;
    font-size: 0.95rem;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary);
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #aaa;
}

.empty-state i {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.3;
}

.empty-state h3 {
    margin-bottom: 10px;
    color: #fff;
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 5px;
    margin-top: 30px;
}

.pagination a,
.pagination span {
    padding: 10px 15px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: #aaa;
    transition: all 0.3s;
}

.pagination a:hover,
.pagination .active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: absolute;
        top: 60px;
        left: 0;
        right: 0;
        background: var(--bg-secondary);
        flex-direction: column;
        padding: 20px;
        gap: 10px;
        display: none;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-menu.show {
        display: flex;
    }

    .nav-menu > li {
        width: 100%;
    }

    .nav-menu a {
        width: 100%;
        justify-content: flex-start;
    }
    
    .nav-menu .nav-dropdown-menu {
        position: static;
        box-shadow: none;
        border: none;
        border-radius: 0;
        background: rgba(0,0,0,0.2);
        margin-top: 5px;
        min-width: 100%;
    }
    
    .nav-dropdown-menu li a {
        padding-left: 30px !important;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .challenges-grid,
    .competitions-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}