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

:root {
    --bg-primary: #0a0b10;
    --bg-secondary: #0d1117;
    --bg-card: #111827;
    --bg-card-hover: #1a2332;
    --accent-cyan: #00f0ff;
    --accent-blue: #1e90ff;
    --accent-purple: #8b5cf6;
    --accent-green: #00ff88;
    --accent-red: #ff3e3e;
    --accent-yellow: #fbbf24;
    --accent-orange: #f97316;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #475569;
    --border-color: #1e293b;
    --glow-cyan: 0 0 20px rgba(0, 240, 255, 0.3);
    --font-mono: 'JetBrains Mono', monospace;
    --font-display: 'Rajdhani', sans-serif;
    --font-body: 'Inter', sans-serif;
}

html { scroll-behavior: smooth; }
body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: repeating-linear-gradient(
        0deg, transparent, transparent 2px,
        rgba(0, 240, 255, 0.008) 2px,
        rgba(0, 240, 255, 0.008) 4px
    );
    pointer-events: none;
    z-index: 9999;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--accent-cyan); border-radius: 3px; }

/* ===== NAVBAR ===== */
.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    padding: 0 2rem;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(10, 11, 16, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.nav-logo img { height: 40px; width: auto; filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.4)); }
.nav-logo-text {
    font-family: var(--font-display);
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent-cyan);
    letter-spacing: 3px;
    text-transform: uppercase;
}

.nav-links { display: flex; list-style: none; gap: 2rem; align-items: center; }
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: all 0.3s ease;
}
.nav-links a::before { content: '>'; margin-right: 4px; color: var(--accent-cyan); opacity: 0; transition: opacity 0.3s; }
.nav-links a:hover { color: var(--accent-cyan); }
.nav-links a:hover::before { opacity: 1; }
.nav-links a.active { color: var(--accent-cyan); }
.nav-links a.active::before { opacity: 1; }

.mobile-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.mobile-toggle span { width: 25px; height: 2px; background: var(--accent-cyan); }

/* ===== BREADCRUMB ===== */
.breadcrumb {
    padding: 90px 2rem 0;
    max-width: 1400px;
    margin: 0 auto;
}
.breadcrumb-inner {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}
.breadcrumb a { color: var(--accent-cyan); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb-sep { color: var(--text-muted); }

/* ===== PAGE HEADER ===== */
.page-header {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 2rem 3rem;
}
.page-header h1 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 4px;
    margin-bottom: 0.5rem;
}
.page-header h1 span { color: var(--accent-cyan); }
.page-header p { color: var(--text-secondary); font-size: 1rem; }

/* ===== STATS BAR ===== */
.lab-stats {
    max-width: 1400px;
    margin: 0 auto 3rem;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 1rem;
}
.lab-stat {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.2rem;
    text-align: center;
}
.lab-stat-num {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent-cyan);
    line-height: 1;
}
.lab-stat-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 4px;
}

/* ===== FILTER TABS ===== */
.filter-bar {
    max-width: 1400px;
    margin: 0 auto 2rem;
    padding: 0 2rem;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.filter-btn {
    padding: 8px 20px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.filter-btn:hover, .filter-btn.active {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    background: rgba(0, 240, 255, 0.05);
}
.filter-btn .count {
    margin-left: 6px;
    color: var(--text-muted);
    font-size: 0.65rem;
}
.filter-btn.active .count { color: var(--accent-cyan); }

/* ===== CHALLENGE GRID ===== */
.challenge-grid {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem 4rem;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.challenge-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}

.challenge-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 3px;
    background: var(--card-accent, var(--accent-cyan));
    opacity: 0.7;
}

.challenge-card:hover {
    border-color: var(--card-accent, var(--accent-cyan));
    transform: translateY(-4px);
    box-shadow: 0 10px 40px rgba(0, 240, 255, 0.1);
}

.challenge-card.locked {
    opacity: 0.5;
    cursor: not-allowed;
}
.challenge-card.locked:hover {
    transform: none;
    box-shadow: none;
}

.challenge-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.challenge-category {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    padding: 3px 10px;
    border-radius: 3px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
}
.cat-web { background: rgba(0, 240, 255, 0.1); color: var(--accent-cyan); border: 1px solid rgba(0, 240, 255, 0.3); }
.cat-crypto { background: rgba(139, 92, 246, 0.1); color: var(--accent-purple); border: 1px solid rgba(139, 92, 246, 0.3); }
.cat-pwn { background: rgba(255, 62, 62, 0.1); color: var(--accent-red); border: 1px solid rgba(255, 62, 62, 0.3); }
.cat-rev { background: rgba(251, 191, 36, 0.1); color: var(--accent-yellow); border: 1px solid rgba(251, 191, 36, 0.3); }
.cat-forensics { background: rgba(0, 255, 136, 0.1); color: var(--accent-green); border: 1px solid rgba(0, 255, 136, 0.3); }
.cat-osint { background: rgba(249, 115, 22, 0.1); color: var(--accent-orange); border: 1px solid rgba(249, 115, 22, 0.3); }

.challenge-difficulty {
    display: flex;
    gap: 3px;
}
.diff-dot {
    width: 8px; height: 8px;
    border-radius: 50%;
    background: var(--border-color);
}
.diff-dot.filled { background: var(--card-accent, var(--accent-cyan)); }
.diff-easy .diff-dot.filled { background: var(--accent-green); }
.diff-medium .diff-dot.filled { background: var(--accent-yellow); }
.diff-hard .diff-dot.filled { background: var(--accent-orange); }
.diff-expert .diff-dot.filled { background: var(--accent-red); }

.challenge-title {
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
}

.challenge-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 1rem;
}

.challenge-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
}

.challenge-points {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-cyan);
}

.challenge-status {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 3px 10px;
    border-radius: 3px;
    text-transform: uppercase;
}
.status-available { background: rgba(0, 255, 136, 0.1); color: var(--accent-green); }
.status-completed { background: rgba(0, 240, 255, 0.1); color: var(--accent-cyan); }
.status-locked { background: rgba(71, 85, 105, 0.3); color: var(--text-muted); }

.challenge-progress {
    margin-top: 0.75rem;
}
.progress-bar {
    height: 3px;
    background: var(--border-color);
    border-radius: 2px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: var(--card-accent, var(--accent-cyan));
    border-radius: 2px;
    transition: width 0.5s ease;
}
.progress-text {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* ===== TERMINAL MODAL ===== */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}
.modal-overlay.active { display: flex; }

.modal-terminal {
    background: #0d1117;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    width: 100%;
    max-width: 900px;
    max-height: 85vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: #161b22;
    border-bottom: 1px solid var(--border-color);
}

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

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

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.3s;
    line-height: 1;
}
.modal-close:hover { color: var(--accent-red); }

.modal-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    flex: 1;
    overflow: hidden;
}

.modal-challenge {
    padding: 1.5rem;
    overflow-y: auto;
    border-right: 1px solid var(--border-color);
}

.modal-challenge h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
    color: var(--accent-cyan);
}

.modal-challenge .challenge-tags {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.modal-challenge p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

.modal-hints {
    background: rgba(0, 240, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 1rem;
    margin-top: 1rem;
}

.modal-hints summary {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-cyan);
    cursor: pointer;
}

.modal-hints ul {
    margin-top: 0.75rem;
    padding-left: 1.2rem;
}

.modal-hints li {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
}

.modal-workspace {
    display: flex;
    flex-direction: column;
}

.workspace-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    background: #161b22;
    border-bottom: 1px solid var(--border-color);
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.workspace-terminal {
    flex: 1;
    padding: 1rem;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent-green);
    overflow-y: auto;
    min-height: 300px;
}

.terminal-line { margin-bottom: 4px; }
.terminal-prompt { color: var(--accent-cyan); }
.terminal-output { color: var(--text-secondary); padding-left: 12px; }
.terminal-flag { color: var(--accent-yellow); font-weight: bold; }
.terminal-error { color: var(--accent-red); }
.terminal-success { color: var(--accent-green); }

.workspace-input-area {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background: #161b22;
    border-top: 1px solid var(--border-color);
}

.workspace-input-area .prompt {
    font-family: var(--font-mono);
    color: var(--accent-cyan);
    font-size: 0.85rem;
}

.workspace-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    outline: none;
}

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

.flag-submit-btn {
    padding: 6px 16px;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    color: var(--bg-primary);
    border: none;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}
.flag-submit-btn:hover {
    box-shadow: var(--glow-cyan);
    transform: scale(1.05);
}

/* ===== LEVEL PROGRESS ===== */
.level-section {
    max-width: 1400px;
    margin: 0 auto 3rem;
    padding: 0 2rem;
}

.level-section h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.level-section h2::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.level-path {
    display: flex;
    gap: 0;
    overflow-x: auto;
    padding-bottom: 1rem;
}

.level-node {
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.level-node-circle {
    width: 48px; height: 48px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-muted);
    transition: all 0.3s ease;
    position: relative;
}

.level-node.completed .level-node-circle {
    border-color: var(--accent-green);
    background: rgba(0, 255, 136, 0.1);
    color: var(--accent-green);
    box-shadow: 0 0 15px rgba(0, 255, 136, 0.2);
}

.level-node.current .level-node-circle {
    border-color: var(--accent-cyan);
    background: rgba(0, 240, 255, 0.1);
    color: var(--accent-cyan);
    box-shadow: var(--glow-cyan);
    animation: pulse-level 2s infinite;
}

@keyframes pulse-level {
    0%, 100% { box-shadow: 0 0 15px rgba(0, 240, 255, 0.2); }
    50% { box-shadow: 0 0 25px rgba(0, 240, 255, 0.4); }
}

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

.level-node.locked .level-node-circle {
    opacity: 0.4;
}

.level-node-label {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    white-space: nowrap;
}

.level-node.completed .level-node-label { color: var(--accent-green); }
.level-node.current .level-node-label { color: var(--accent-cyan); }

.level-connector {
    flex-shrink: 0;
    width: 60px;
    height: 2px;
    background: var(--border-color);
    margin-bottom: 20px;
    position: relative;
}

.level-connector.completed {
    background: var(--accent-green);
}

/* ===== SEARCH ===== */
.search-bar {
    max-width: 1400px;
    margin: 0 auto 2rem;
    padding: 0 2rem;
}

.search-input-wrapper {
    position: relative;
    max-width: 400px;
}

.search-input {
    width: 100%;
    padding: 10px 16px 10px 40px;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.3s;
}

.search-input:focus { border-color: var(--accent-cyan); }
.search-input::placeholder { color: var(--text-muted); }

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ===== EMPTY STATE ===== */
.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 4rem 2rem;
}
.empty-state .icon { font-size: 3rem; margin-bottom: 1rem; }
.empty-state h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}
.empty-state p { color: var(--text-muted); font-size: 0.9rem; }

/* ===== FOOTER ===== */
.footer {
    padding: 2rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
}
.footer p {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
}
.footer a { color: var(--accent-cyan); text-decoration: none; }
.footer a:hover { text-decoration: underline; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .modal-body { grid-template-columns: 1fr; }
    .modal-challenge { border-right: none; border-bottom: 1px solid var(--border-color); max-height: 40vh; }
    .challenge-grid { grid-template-columns: 1fr; }
    .level-path { gap: 0; }
    .level-connector { width: 30px; }
}