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

:root {
    --bg-primary: #0a0e17;
    --bg-secondary: #111827;
    --bg-panel: #1a1f2e;
    --border: #2d3748;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-green: #10b981;
    --accent-red: #ef4444;
    --accent-yellow: #f59e0b;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --accent-cyan: #06b6d4;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
}

body {
    font-family: 'Courier New', 'Consolas', 'Monaco', monospace;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

#app {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
}

.header-left h1 {
    font-size: 1.5rem;
    color: var(--accent-green);
    letter-spacing: 2px;
}

.header-left .subtitle {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 3px;
}

.header-right {
    display: flex;
    gap: 20px;
    align-items: center;
}

.score-display {
    background: var(--bg-panel);
    border: 1px solid var(--accent-green);
    padding: 8px 16px;
    font-size: 0.9rem;
    color: var(--accent-green);
}

.flags-count {
    background: var(--bg-panel);
    border: 1px solid var(--accent-purple);
    padding: 8px 16px;
    font-size: 0.9rem;
    color: var(--accent-purple);
}

/* Screens */
.screen {
    display: none;
}

.screen.active {
    display: block;
}

/* Terminal Box */
.terminal-box {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    max-width: 800px;
    margin: 40px auto;
}

.terminal-box.wide {
    max-width: 900px;
}

.terminal-header {
    background: var(--bg-panel);
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 8px;
    border-bottom: 1px solid var(--border);
}

.terminal-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.terminal-dot.red { background: var(--accent-red); }
.terminal-dot.yellow { background: var(--accent-yellow); }
.terminal-dot.green { background: var(--accent-green); }

.terminal-title {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-left: 8px;
}

.terminal-body {
    padding: 24px;
}

.typed-text {
    color: var(--accent-green);
    font-size: 1.1rem;
    margin-bottom: 8px;
}

.highlight {
    color: var(--accent-cyan);
    font-weight: bold;
}

/* Level Cards */
.level-cards {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 8px;
}

.level-card {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    background: var(--bg-panel);
}

.level-card:hover {
    border-color: var(--accent-green);
    background: rgba(16, 185, 129, 0.05);
}

.level-card.easy:hover { border-color: var(--accent-green); }
.level-card.medium:hover { border-color: var(--accent-yellow); }
.level-card.hard:hover { border-color: var(--accent-red); }

.level-number {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--text-muted);
    min-width: 40px;
    text-align: center;
}

.level-info {
    flex: 1;
}

.level-info h3 {
    font-size: 1rem;
    color: var(--text-primary);
}

.level-info p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.level-detail {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.level-challenges {
    font-size: 0.8rem;
    color: var(--text-muted);
    background: var(--bg-secondary);
    padding: 4px 10px;
    border-radius: 4px;
}

/* Challenge Layout */
.challenge-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 20px;
}

.panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.level-badge {
    padding: 4px 12px;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.level-badge.easy { background: rgba(16, 185, 129, 0.15); color: var(--accent-green); border: 1px solid var(--accent-green); }
.level-badge.medium { background: rgba(245, 158, 11, 0.15); color: var(--accent-yellow); border: 1px solid var(--accent-yellow); }
.level-badge.hard { background: rgba(239, 68, 68, 0.15); color: var(--accent-red); border: 1px solid var(--accent-red); }

#challengeNumber {
    font-size: 0.85rem;
    color: var(--text-muted);
}

#challengeTitle {
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: var(--accent-cyan);
}

.challenge-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.7;
}

/* System Info */
.system-info, .knowledge-base {
    margin-bottom: 16px;
}

.system-info h4, .knowledge-base h4 {
    font-size: 0.8rem;
    color: var(--accent-yellow);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.info-block, .kb-block {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 12px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.kb-entry {
    padding: 6px 0;
    border-bottom: 1px solid rgba(45, 55, 72, 0.5);
}

.kb-entry:last-child {
    border-bottom: none;
}

.kb-entry .doc-name {
    color: var(--accent-blue);
    font-weight: bold;
}

.kb-entry .doc-content {
    color: var(--text-muted);
    font-size: 0.75rem;
    margin-top: 2px;
}

/* Hint */
.hint-section {
    margin-top: 16px;
}

.hint-text {
    margin-top: 8px;
    padding: 12px;
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid var(--accent-yellow);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--accent-yellow);
}

.hidden {
    display: none !important;
}

/* Attack Panel */
.attack-panel h3 {
    font-size: 1rem;
    color: var(--accent-red);
    margin-bottom: 8px;
}

.attack-instruction {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.input-group {
    margin-bottom: 16px;
}

.input-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.input-group input,
.input-group textarea {
    width: 100%;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 4px;
    padding: 10px 12px;
    color: var(--text-primary);
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    resize: vertical;
}

.input-group input:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--accent-green);
}

/* Buttons */
.btn {
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: bold;
}

.btn-attack {
    background: var(--accent-red);
    color: white;
    width: 100%;
    padding: 12px;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.btn-attack:hover {
    background: #dc2626;
}

.btn-hint {
    background: transparent;
    color: var(--accent-yellow);
    border: 1px solid var(--accent-yellow);
    font-size: 0.75rem;
    padding: 6px 14px;
}

.btn-hint:hover {
    background: rgba(245, 158, 11, 0.1);
}

.btn-hint:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

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

.btn-primary:hover {
    background: #059669;
}

.btn-primary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

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

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

/* Results */
.results {
    margin-top: 20px;
    border-top: 1px solid var(--border);
    padding-top: 16px;
}

.result-header h4 {
    color: var(--accent-cyan);
    font-size: 0.9rem;
    margin-bottom: 12px;
}

.result-section {
    margin-bottom: 12px;
    padding: 12px;
    background: var(--bg-panel);
    border-radius: 4px;
    font-size: 0.8rem;
    line-height: 1.7;
    border-left: 3px solid var(--border);
}

.result-section.success {
    border-left-color: var(--accent-green);
}

.result-section.failure {
    border-left-color: var(--accent-red);
}

.result-section.info {
    border-left-color: var(--accent-blue);
}

.result-section.flag {
    border-left-color: var(--accent-purple);
    background: rgba(139, 92, 246, 0.1);
}

.result-label {
    color: var(--text-muted);
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

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

.result-value.green { color: var(--accent-green); }
.result-value.red { color: var(--accent-red); }
.result-value.yellow { color: var(--accent-yellow); }
.result-value.purple { color: var(--accent-purple); }

.chunk-list {
    margin-top: 6px;
}

.chunk-item {
    padding: 4px 0;
    color: var(--text-muted);
    font-size: 0.75rem;
}

.chunk-item .chunk-score {
    color: var(--accent-cyan);
}

/* Challenge Nav */
.challenge-nav {
    display: flex;
    justify-content: space-between;
    padding: 16px 0;
}

/* Scoreboard */
.final-score {
    font-size: 2rem;
    color: var(--accent-green);
    margin: 16px 0;
    text-align: center;
}

#finalRank {
    text-align: center;
    font-size: 1.5rem;
    color: var(--accent-purple);
    margin-bottom: 8px;
}

.rank-desc {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 16px;
}

.flags-list {
    margin: 20px 0;
}

.flag-item {
    padding: 8px 12px;
    margin: 6px 0;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 4px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8rem;
}

.flag-item .flag-name {
    color: var(--accent-purple);
}

.flag-item .flag-points {
    color: var(--accent-green);
}

/* Status bar for current challenge status */
.status-bar {
    margin-top: 16px;
    padding: 10px 16px;
    background: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

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

.cursor-blink::after {
    content: '_';
    animation: blink 1s infinite;
    color: var(--accent-green);
}

/* Responsive */
@media (max-width: 900px) {
    .challenge-layout {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    header {
        flex-direction: column;
        gap: 12px;
    }

    .header-right {
        width: 100%;
        justify-content: center;
    }
}

/* Stealth meter */
.stealth-meter {
    margin-top: 8px;
    height: 4px;
    background: var(--bg-panel);
    border-radius: 2px;
    overflow: hidden;
}

.stealth-fill {
    height: 100%;
    transition: width 0.5s;
    border-radius: 2px;
}

.stealth-fill.low { background: var(--accent-red); }
.stealth-fill.medium { background: var(--accent-yellow); }
.stealth-fill.high { background: var(--accent-green); }

/* --- 2026 UI Refresh --- */
body {
    font-family: 'Inter', 'Segoe UI', 'Roboto', sans-serif;
    background:
        radial-gradient(circle at 10% 10%, rgba(59, 130, 246, 0.12), transparent 36%),
        radial-gradient(circle at 90% 0%, rgba(139, 92, 246, 0.12), transparent 42%),
        linear-gradient(180deg, #070b14 0%, #0a0e17 45%, #070b14 100%);
}

.bg-glow {
    position: fixed;
    border-radius: 999px;
    filter: blur(70px);
    z-index: 0;
    opacity: 0.4;
    pointer-events: none;
}

.bg-glow-1 {
    width: 280px;
    height: 280px;
    background: rgba(6, 182, 212, 0.35);
    top: -60px;
    left: -40px;
}

.bg-glow-2 {
    width: 340px;
    height: 340px;
    background: rgba(139, 92, 246, 0.3);
    right: -80px;
    top: 35%;
}

#app,
header,
main,
footer,
.screen,
.panel,
.terminal-box {
    position: relative;
    z-index: 1;
}

#app {
    padding: 18px 24px 26px;
}

header {
    border: 1px solid rgba(148, 163, 184, 0.22);
    background: rgba(15, 23, 42, 0.72);
    backdrop-filter: blur(8px);
    border-radius: 14px;
    padding: 14px 18px;
    margin: 10px 0 24px;
}

.brand-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent-green);
    box-shadow: 0 0 0 6px rgba(16, 185, 129, 0.15);
}

.header-left h1 {
    font-size: 1.35rem;
    letter-spacing: 0.5px;
}

.header-left .subtitle {
    display: inline-block;
    margin-top: 4px;
    letter-spacing: 1.4px;
}

.score-display,
.flags-count {
    border-radius: 10px;
    background: rgba(15, 23, 42, 0.85);
    font-weight: 600;
    letter-spacing: 0.2px;
}

.hero-strip {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin: 4px auto 16px;
    max-width: 880px;
}

.hero-card {
    border: 1px solid rgba(100, 116, 139, 0.35);
    background: linear-gradient(160deg, rgba(15, 23, 42, 0.92), rgba(30, 41, 59, 0.58));
    border-radius: 12px;
    padding: 10px 12px;
}

.hero-label {
    display: block;
    color: var(--text-muted);
    font-size: 0.72rem;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.hero-card strong {
    color: #dbeafe;
    font-size: 0.92rem;
}

.terminal-box,
.panel {
    border-radius: 14px;
    border: 1px solid rgba(148, 163, 184, 0.25);
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.7));
    box-shadow: 0 12px 30px rgba(2, 6, 23, 0.35);
}

.terminal-header {
    background: rgba(2, 6, 23, 0.36);
}

.level-card {
    border-radius: 10px;
    border: 1px solid rgba(100, 116, 139, 0.35);
    background: linear-gradient(180deg, rgba(30, 41, 59, 0.65), rgba(15, 23, 42, 0.7));
}

.level-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 18px rgba(2, 6, 23, 0.3);
}

.input-group input,
.input-group textarea {
    border-radius: 10px;
    border: 1px solid rgba(100, 116, 139, 0.45);
    background: rgba(15, 23, 42, 0.8);
    font-family: 'JetBrains Mono', 'Consolas', monospace;
}

.btn {
    border-radius: 10px;
}

.btn-attack {
    background: linear-gradient(120deg, #ef4444, #dc2626);
    box-shadow: 0 8px 20px rgba(239, 68, 68, 0.3);
}

.result-section {
    border-radius: 10px;
    background: rgba(15, 23, 42, 0.78);
}

footer {
    margin-top: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.78rem;
}

@media (max-width: 900px) {
    .hero-strip {
        grid-template-columns: 1fr;
    }
}