/* ========================================
   CYBER DEFENSE SIMULATOR - STYLESHEET
   Dark cybersecurity theme
   ======================================== */

/* --- CSS Variables --- */
:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-tertiary: #1a2332;
    --bg-card: #1e293b;
    --bg-card-hover: #243447;
    --border-color: #2a3a4e;
    --border-glow: #00d4ff33;

    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --accent-cyan: #00d4ff;
    --accent-green: #00ff88;
    --accent-red: #ff4757;
    --accent-orange: #ffa502;
    --accent-purple: #a855f7;
    --accent-yellow: #fbbf24;
    --accent-pink: #f472b6;

    --font-display: 'Orbitron', monospace, sans-serif;
    --font-body: 'Rajdhani', 'Segoe UI', sans-serif;

    --radius: 8px;
    --radius-lg: 12px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --glow-cyan: 0 0 20px rgba(0, 212, 255, 0.3);
    --glow-green: 0 0 20px rgba(0, 255, 136, 0.3);
    --glow-red: 0 0 20px rgba(255, 71, 87, 0.3);
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.5;
}

#app {
    width: 100%;
    height: 100%;
    position: relative;
}

/* --- Screens --- */
.screen {
    display: none;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    flex-direction: column;
}

.screen.active {
    display: flex;
}

.screen-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 32px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}

.screen-header h2 {
    font-family: var(--font-display);
    font-size: 1.4rem;
    color: var(--accent-cyan);
    letter-spacing: 2px;
}

/* --- Buttons --- */
.btn {
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 700;
    padding: 14px 40px;
    border: 2px solid transparent;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: 2px;
    text-transform: uppercase;
    outline: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-cyan), #0099cc);
    color: var(--bg-primary);
    border-color: var(--accent-cyan);
    box-shadow: var(--glow-cyan);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #33ddff, var(--accent-cyan));
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.5);
    transform: translateY(-2px);
}

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

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

.btn-back {
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 700;
    padding: 8px 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: 1px;
}

.btn-back:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

.btn-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 1rem;
}

.btn-icon:hover {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
    background: var(--bg-card);
}

.btn-small {
    font-family: var(--font-display);
    font-size: 0.65rem;
    font-weight: 700;
    padding: 6px 14px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    letter-spacing: 1px;
}

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

.btn-upgrade:hover {
    box-shadow: var(--glow-green);
}

.btn-upgrade:disabled {
    background: var(--text-muted);
    border-color: var(--text-muted);
    cursor: not-allowed;
    box-shadow: none;
}

.btn-sell {
    background: transparent;
    color: var(--accent-red);
    border-color: var(--accent-red);
}

.btn-sell:hover {
    background: var(--accent-red);
    color: white;
}

/* --- Main Menu --- */
.menu-bg {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(0, 212, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(168, 85, 247, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(0, 255, 136, 0.05) 0%, transparent 50%),
        var(--bg-primary);
    position: relative;
    overflow: hidden;
}

.scanline {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: repeating-linear-gradient(
        0deg,
        transparent,
        transparent 2px,
        rgba(0, 212, 255, 0.015) 2px,
        rgba(0, 212, 255, 0.015) 4px
    );
    pointer-events: none;
    z-index: 1;
}

.menu-content {
    text-align: center;
    z-index: 2;
}

.game-title {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--text-primary);
    letter-spacing: 6px;
    line-height: 1.2;
    margin-bottom: 12px;
    text-shadow: 0 0 40px rgba(0, 212, 255, 0.3);
}

.game-title span {
    color: var(--accent-cyan);
    font-size: 4rem;
}

.subtitle {
    font-family: var(--font-body);
    font-size: 1.1rem;
    color: var(--text-secondary);
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: 48px;
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.menu-buttons .btn {
    width: 280px;
}

.version-info {
    margin-top: 48px;
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 2px;
}

/* --- Level Select --- */
.level-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    padding: 32px;
    max-width: 1000px;
    margin: 0 auto;
    overflow-y: auto;
    flex: 1;
}

.level-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.level-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-purple));
    opacity: 0;
    transition: opacity 0.3s ease;
}

.level-card:hover::before,
.level-card:hover {
    border-color: var(--accent-cyan);
    box-shadow: var(--glow-cyan);
}

.level-card:hover::before {
    opacity: 1;
}

.level-card.locked {
    opacity: 0.4;
    cursor: not-allowed;
}

.level-card.locked:hover {
    border-color: var(--border-color);
    box-shadow: none;
}

.level-card.completed {
    border-color: var(--accent-green);
}

.level-card.completed::before {
    background: var(--accent-green);
    opacity: 1;
}

.level-number {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--accent-cyan);
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.level-card.completed .level-number {
    color: var(--accent-green);
}

.level-name {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.level-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.4;
}

.level-difficulty {
    display: flex;
    gap: 4px;
}

.diff-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--border-color);
}

.diff-dot.active {
    background: var(--accent-orange);
    box-shadow: 0 0 6px rgba(255, 165, 2, 0.5);
}

.level-stars {
    font-size: 1rem;
    color: var(--accent-yellow);
    margin-top: 8px;
}

/* --- Game HUD --- */
#hud {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    z-index: 10;
    min-height: 56px;
}

.hud-left, .hud-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.hud-center {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hud-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hud-label {
    font-family: var(--font-display);
    font-size: 0.6rem;
    color: var(--text-muted);
    letter-spacing: 2px;
}

.hud-value {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.phase-text {
    font-family: var(--font-display);
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent-cyan);
    letter-spacing: 2px;
}

.timer-text {
    font-family: var(--font-display);
    font-size: 0.7rem;
    color: var(--accent-orange);
}

.health-bar-container {
    width: 100px;
    height: 8px;
    background: var(--bg-primary);
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    margin-top: 4px;
}

.health-bar {
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, var(--accent-green), #66ff99);
    transition: width 0.3s ease, background 0.3s ease;
    border-radius: 4px;
}

/* --- Game Container --- */
#game-container {
    display: flex;
    flex: 1;
    overflow: hidden;
    position: relative;
}

#game-canvas {
    flex: 1;
    display: block;
    background: var(--bg-primary);
    cursor: crosshair;
}

/* --- Tower Sidebar --- */
#tower-sidebar {
    width: 220px;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    padding: 12px;
}

#tower-sidebar h3 {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--accent-cyan);
    letter-spacing: 3px;
    text-align: center;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 10px;
}

.tower-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 10px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.tower-card:hover {
    border-color: var(--accent-cyan);
    background: var(--bg-card-hover);
}

.tower-card.selected {
    border-color: var(--accent-cyan);
    box-shadow: var(--glow-cyan);
    background: var(--bg-card-hover);
}

.tower-card.disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.tower-card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.tower-icon {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    flex-shrink: 0;
}

.tower-card-name {
    font-family: var(--font-display);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-primary);
}

.tower-card-cost {
    font-family: var(--font-display);
    font-size: 0.7rem;
    font-weight: 700;
    color: var(--accent-green);
}

.tower-card-desc {
    font-size: 0.72rem;
    color: var(--text-muted);
    line-height: 1.3;
    margin-top: 4px;
}

/* --- Tower Info Panel --- */
#tower-info-panel {
    background: var(--bg-card);
    border: 1px solid var(--accent-cyan);
    border-radius: var(--radius);
    padding: 12px;
    margin-top: auto;
}

#tower-info-panel h4 {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--accent-cyan);
    letter-spacing: 1px;
    margin-bottom: 8px;
}

#tower-info-stats {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 10px;
}

#tower-info-stats .stat-row {
    display: flex;
    justify-content: space-between;
    padding: 2px 0;
}

.stat-label {
    color: var(--text-muted);
}

.stat-value {
    color: var(--text-primary);
    font-weight: 600;
}

#tower-info-buttons {
    display: flex;
    gap: 8px;
}

/* --- Modals --- */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal.hidden {
    display: none;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    text-align: center;
    box-shadow: var(--shadow);
    animation: modalFadeIn 0.3s ease;
}

@keyframes modalFadeIn {
    from { opacity: 0; transform: scale(0.95) translateY(10px); }
    to { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.success-icon {
    color: var(--accent-green);
    text-shadow: var(--glow-green);
}

.fail-icon {
    color: var(--accent-red);
    text-shadow: var(--glow-red);
}

.modal-content h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    letter-spacing: 3px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.scenario-text {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.objectives-list {
    text-align: left;
    margin-bottom: 20px;
}

.objectives-list h4 {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--accent-orange);
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.objectives-list li {
    color: var(--text-secondary);
    padding: 4px 0;
    font-size: 0.9rem;
    list-style: none;
    padding-left: 20px;
    position: relative;
}

.objectives-list li::before {
    content: '\25B8';
    position: absolute;
    left: 0;
    color: var(--accent-cyan);
}

.available-towers {
    text-align: left;
    margin-bottom: 20px;
}

.available-towers h4 {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--accent-green);
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.available-towers .tower-tag {
    display: inline-block;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 4px 10px;
    margin: 3px;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.modal-buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-top: 20px;
}

/* --- Stats Grid (Level Complete) --- */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 12px;
}

.stat-card .stat-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
    font-family: var(--font-display);
}

.stat-card .stat-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--accent-cyan);
    font-family: var(--font-display);
}

/* --- Learning Summary --- */
.learning-summary {
    text-align: left;
    background: var(--bg-card);
    border: 1px solid var(--accent-purple);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 20px;
}

.learning-summary h4 {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--accent-purple);
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.learning-summary p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 6px;
}

/* --- Notifications --- */
#notifications {
    position: absolute;
    top: 70px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 50;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    pointer-events: none;
}

.notification {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 10px 20px;
    font-size: 0.85rem;
    color: var(--text-primary);
    font-family: var(--font-body);
    animation: notifSlide 0.3s ease;
    box-shadow: var(--shadow);
    white-space: nowrap;
}

.notification.success {
    border-color: var(--accent-green);
    color: var(--accent-green);
}

.notification.warning {
    border-color: var(--accent-orange);
    color: var(--accent-orange);
}

.notification.danger {
    border-color: var(--accent-red);
    color: var(--accent-red);
}

.notification.info {
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

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

/* --- Encyclopedia --- */
.encyclopedia-container {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.encyclopedia-nav {
    width: 260px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 16px;
}

.enc-category {
    margin-bottom: 16px;
}

.enc-category-title {
    font-family: var(--font-display);
    font-size: 0.7rem;
    color: var(--accent-cyan);
    letter-spacing: 2px;
    margin-bottom: 8px;
    padding-bottom: 4px;
    border-bottom: 1px solid var(--border-color);
}

.enc-item {
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.enc-item:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.enc-item.active {
    background: var(--bg-card);
    color: var(--accent-cyan);
    border-left: 2px solid var(--accent-cyan);
}

.encyclopedia-content {
    flex: 1;
    overflow-y: auto;
    padding: 32px;
}

.enc-placeholder {
    color: var(--text-muted);
    text-align: center;
    margin-top: 40px;
}

.enc-entry h3 {
    font-family: var(--font-display);
    font-size: 1.2rem;
    color: var(--accent-cyan);
    letter-spacing: 2px;
    margin-bottom: 16px;
}

.enc-entry .enc-section {
    margin-bottom: 20px;
}

.enc-entry .enc-section h4 {
    font-family: var(--font-display);
    font-size: 0.75rem;
    color: var(--accent-orange);
    letter-spacing: 2px;
    margin-bottom: 8px;
}

.enc-entry .enc-section p,
.enc-entry .enc-section li {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.9rem;
}

.enc-entry .enc-section ul {
    list-style: none;
    padding-left: 16px;
}

.enc-entry .enc-section li::before {
    content: '\25B8';
    color: var(--accent-cyan);
    margin-right: 8px;
}

.enc-entry .legislation-ref {
    background: var(--bg-card);
    border: 1px solid var(--accent-purple);
    border-radius: var(--radius);
    padding: 12px;
    margin-top: 8px;
}

.enc-entry .legislation-ref h5 {
    font-family: var(--font-display);
    font-size: 0.65rem;
    color: var(--accent-purple);
    letter-spacing: 2px;
    margin-bottom: 4px;
}

/* --- Achievements --- */
.achievements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 16px;
    padding: 32px;
    overflow-y: auto;
    flex: 1;
}

.achievement-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: all 0.2s ease;
}

.achievement-card.unlocked {
    border-color: var(--accent-yellow);
}

.achievement-card.locked {
    opacity: 0.5;
}

.achievement-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.achievement-info h4 {
    font-family: var(--font-display);
    font-size: 0.75rem;
    letter-spacing: 1px;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.achievement-info p {
    font-size: 0.8rem;
    color: var(--text-secondary);
}

/* --- Educational Popup --- */
.edu-content {
    text-align: left;
}

.edu-badge {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.65rem;
    color: var(--accent-purple);
    letter-spacing: 2px;
    margin-bottom: 12px;
    padding: 4px 12px;
    border: 1px solid var(--accent-purple);
    border-radius: 4px;
}

.edu-content h3 {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--text-primary);
    letter-spacing: 1px;
    margin-bottom: 12px;
}

.edu-content p {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.legislation-box {
    background: var(--bg-card);
    border: 1px solid var(--accent-orange);
    border-radius: var(--radius);
    padding: 12px;
    margin-bottom: 20px;
}

.legislation-box h5 {
    font-family: var(--font-display);
    font-size: 0.65rem;
    color: var(--accent-orange);
    letter-spacing: 2px;
    margin-bottom: 6px;
}

.legislation-box p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* --- Tooltip --- */
#tooltip {
    position: fixed;
    background: var(--bg-secondary);
    border: 1px solid var(--accent-cyan);
    border-radius: var(--radius);
    padding: 12px;
    max-width: 250px;
    z-index: 200;
    pointer-events: none;
    box-shadow: var(--shadow);
    font-size: 0.8rem;
}

#tooltip.hidden {
    display: none;
}

#tooltip h4 {
    font-family: var(--font-display);
    font-size: 0.7rem;
    color: var(--accent-cyan);
    letter-spacing: 1px;
    margin-bottom: 6px;
}

#tooltip p {
    color: var(--text-secondary);
    line-height: 1.4;
    margin-bottom: 4px;
}

#tooltip .tooltip-stat {
    display: flex;
    justify-content: space-between;
    color: var(--text-muted);
    font-size: 0.75rem;
}

#tooltip .tooltip-stat span:last-child {
    color: var(--text-primary);
}

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

/* --- Scrollbar --- */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ========================================
   EDUCATIONAL ENHANCEMENTS
   ======================================== */

/* --- Quiz Modal --- */
.quiz-content {
    text-align: left;
    max-width: 620px;
}

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

.quiz-badge {
    display: inline-block;
    font-family: var(--font-display);
    font-size: 0.7rem;
    color: var(--accent-yellow);
    letter-spacing: 2px;
    padding: 6px 14px;
    border: 1px solid var(--accent-yellow);
    border-radius: 4px;
    background: rgba(251, 191, 36, 0.08);
}

.quiz-reward {
    font-family: var(--font-display);
    font-size: 0.7rem;
    color: var(--accent-green);
    letter-spacing: 1px;
}

.quiz-spec-ref {
    font-family: var(--font-display);
    font-size: 0.6rem;
    color: var(--accent-purple);
    letter-spacing: 2px;
    margin-bottom: 12px;
    padding: 4px 10px;
    background: rgba(168, 85, 247, 0.1);
    border-radius: 4px;
    display: inline-block;
}

.quiz-content h3 {
    font-family: var(--font-body);
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.5;
    margin-bottom: 20px;
}

.quiz-options {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.quiz-option {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    padding: 14px 18px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.4;
    text-align: left;
}

.quiz-option:hover:not(.disabled) {
    border-color: var(--accent-cyan);
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.quiz-option.correct {
    border-color: var(--accent-green);
    background: rgba(0, 255, 136, 0.1);
    color: var(--accent-green);
}

.quiz-option.incorrect {
    border-color: var(--accent-red);
    background: rgba(255, 71, 87, 0.1);
    color: var(--accent-red);
}

.quiz-option.disabled {
    cursor: default;
    opacity: 0.6;
}

.quiz-option.correct.disabled,
.quiz-option.incorrect.disabled {
    opacity: 1;
}

.quiz-feedback {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 16px;
    border-left: 3px solid var(--accent-cyan);
    animation: modalFadeIn 0.3s ease;
}

.quiz-feedback.hidden {
    display: none;
}

.quiz-result-icon {
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.quiz-result-icon.correct {
    color: var(--accent-green);
}

.quiz-result-icon.incorrect {
    color: var(--accent-red);
}

.quiz-feedback p {
    color: var(--text-secondary);
    line-height: 1.5;
    font-size: 0.9rem;
}

/* --- Threat Info Panel --- */
#threat-info-panel {
    position: absolute;
    bottom: 10px;
    left: 10px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 14px 18px;
    width: 320px;
    z-index: 30;
    box-shadow: var(--shadow);
    animation: modalFadeIn 0.2s ease;
}

#threat-info-panel.hidden {
    display: none;
}

.threat-info-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.threat-info-icon {
    font-size: 1.8rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: var(--bg-card);
}

.threat-info-header h4 {
    font-family: var(--font-display);
    font-size: 0.8rem;
    color: var(--text-primary);
    letter-spacing: 1px;
}

.threat-info-type {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.threat-info-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4px 12px;
    font-size: 0.8rem;
    margin-bottom: 10px;
}

.threat-info-stats .stat-row {
    display: flex;
    justify-content: space-between;
}

.threat-info-edu {
    background: var(--bg-card);
    border-radius: 6px;
    padding: 10px;
    margin-bottom: 8px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
    border-left: 3px solid var(--accent-purple);
}

.threat-info-defense {
    font-size: 0.75rem;
    color: var(--accent-green);
    padding: 6px 0;
}

.threat-info-defense strong {
    color: var(--accent-cyan);
    font-family: var(--font-display);
    font-size: 0.6rem;
    letter-spacing: 1px;
}

/* --- "Did You Know?" Banner --- */
.did-you-know {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 220px; /* sidebar width */
    background: linear-gradient(90deg, rgba(168, 85, 247, 0.15), rgba(0, 212, 255, 0.1));
    border-top: 1px solid var(--accent-purple);
    padding: 10px 20px;
    display: flex;
    align-items: center;
    gap: 14px;
    z-index: 20;
    animation: dykSlide 0.5s ease;
}

.did-you-know.hidden {
    display: none;
}

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

.dyk-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.dyk-content {
    flex: 1;
}

.dyk-label {
    font-family: var(--font-display);
    font-size: 0.6rem;
    color: var(--accent-yellow);
    letter-spacing: 2px;
    display: block;
    margin-bottom: 2px;
}

.dyk-content p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin: 0;
}

.dyk-spec {
    font-family: var(--font-display);
    font-size: 0.55rem;
    color: var(--accent-purple);
    letter-spacing: 1px;
    margin-top: 2px;
    display: inline-block;
}

/* --- Knowledge Tracker --- */
.knowledge-container {
    padding: 24px 32px;
    overflow-y: auto;
    flex: 1;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

.knowledge-topic {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    margin-bottom: 16px;
}

.knowledge-topic-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.knowledge-topic-title {
    font-family: var(--font-display);
    font-size: 0.85rem;
    color: var(--accent-cyan);
    letter-spacing: 1px;
}

.knowledge-progress-badge {
    font-family: var(--font-display);
    font-size: 0.65rem;
    padding: 4px 10px;
    border-radius: 4px;
    letter-spacing: 1px;
}

.knowledge-progress-badge.complete {
    background: rgba(0, 255, 136, 0.15);
    color: var(--accent-green);
    border: 1px solid var(--accent-green);
}

.knowledge-progress-badge.partial {
    background: rgba(251, 191, 36, 0.15);
    color: var(--accent-yellow);
    border: 1px solid var(--accent-yellow);
}

.knowledge-progress-badge.not-started {
    background: rgba(100, 116, 139, 0.15);
    color: var(--text-muted);
    border: 1px solid var(--text-muted);
}

.knowledge-progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-primary);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 14px;
}

.knowledge-progress-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.5s ease;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-green));
}

.knowledge-subtopics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}

.knowledge-subtopic {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border-radius: 4px;
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: var(--bg-tertiary);
}

.knowledge-subtopic.covered {
    color: var(--text-primary);
}

.knowledge-check {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.6rem;
    flex-shrink: 0;
}

.knowledge-check.done {
    background: var(--accent-green);
    color: var(--bg-primary);
}

.knowledge-check.pending {
    background: var(--border-color);
    color: var(--text-muted);
}

/* --- Case Study Box (inside level intro) --- */
.case-study-box {
    background: linear-gradient(135deg, rgba(255, 165, 2, 0.08), rgba(239, 68, 68, 0.06));
    border: 1px solid var(--accent-orange);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 20px;
    text-align: left;
}

.case-study-badge {
    font-family: var(--font-display);
    font-size: 0.6rem;
    color: var(--accent-orange);
    letter-spacing: 2px;
    display: block;
    margin-bottom: 6px;
}

.case-study-box h4 {
    font-family: var(--font-display);
    font-size: 0.8rem;
    color: var(--text-primary);
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.case-study-box p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 6px;
}

.case-study-box .case-lesson {
    font-size: 0.8rem;
    color: var(--accent-green);
    font-weight: 600;
    padding-top: 6px;
    border-top: 1px solid rgba(255, 165, 2, 0.2);
    margin-top: 8px;
}

.case-study-box .case-spec {
    font-family: var(--font-display);
    font-size: 0.55rem;
    color: var(--accent-purple);
    letter-spacing: 1px;
    margin-top: 6px;
    display: block;
}

/* --- Responsive --- */
@media (max-width: 900px) {
    .game-title {
        font-size: 2.2rem;
    }

    .game-title span {
        font-size: 2.6rem;
    }

    #tower-sidebar {
        width: 180px;
    }

    .level-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .game-title {
        font-size: 1.6rem;
    }

    .game-title span {
        font-size: 1.8rem;
    }

    #tower-sidebar {
        width: 160px;
        padding: 8px;
    }

    .level-grid {
        grid-template-columns: 1fr;
    }

    .hud-left {
        gap: 10px;
    }
}

/* ========================================================================
   INTEL BRIEFING SCREEN
   ======================================================================== */
.intel-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
    overflow-y: auto;
    max-height: calc(100vh - 100px);
}

.intel-intro {
    color: #94a3b8;
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 20px;
    padding: 12px 16px;
    background: rgba(59, 130, 246, 0.08);
    border-left: 3px solid #3b82f6;
    border-radius: 6px;
}

.intel-section-title {
    color: #00ff88;
    font-size: 1.1rem;
    letter-spacing: 2px;
    margin: 30px 0 8px 0;
    padding-bottom: 6px;
    border-bottom: 1px solid rgba(0, 255, 136, 0.2);
}

.intel-sub {
    color: #64748b;
    font-size: 0.8rem;
    margin-bottom: 12px;
}

/* --- Threat Intel Cards --- */
.intel-threat-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 14px;
    margin-bottom: 30px;
}

.intel-threat-card {
    background: rgba(15, 23, 42, 0.85);
    border: 1px solid rgba(100, 116, 139, 0.25);
    border-radius: 10px;
    padding: 14px;
    transition: border-color 0.3s;
}

.intel-threat-card:hover {
    border-color: rgba(0, 255, 136, 0.4);
}

.intel-threat-card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.intel-threat-icon {
    font-size: 1.8rem;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.3);
}

.intel-threat-card-header h4 {
    color: #f1f5f9;
    font-size: 0.95rem;
    margin: 0;
}

.intel-threat-card-header .intel-threat-type {
    color: #64748b;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.intel-counter-list {
    list-style: none;
    padding: 0;
    margin: 8px 0 0 0;
}

.intel-counter-list li {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 4px 0;
    font-size: 0.82rem;
}

.intel-counter-strong {
    color: #00ff88;
    font-weight: 600;
}

.intel-counter-weak {
    color: #fbbf24;
}

.intel-counter-immune {
    color: #ef4444;
    font-size: 0.78rem;
}

.intel-counter-badge {
    display: inline-block;
    font-size: 0.68rem;
    padding: 1px 6px;
    border-radius: 4px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.intel-counter-badge.strong {
    background: rgba(0, 255, 136, 0.15);
    color: #00ff88;
    border: 1px solid rgba(0, 255, 136, 0.3);
}

.intel-counter-badge.weak {
    background: rgba(251, 191, 36, 0.12);
    color: #fbbf24;
    border: 1px solid rgba(251, 191, 36, 0.25);
}

.intel-counter-badge.immune {
    background: rgba(239, 68, 68, 0.12);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.25);
}

.intel-counter-badge.passive {
    background: rgba(6, 182, 212, 0.12);
    color: #06b6d4;
    border: 1px solid rgba(6, 182, 212, 0.25);
}

/* --- Effectiveness Matrix Table --- */
.intel-matrix-wrap {
    overflow-x: auto;
    margin-bottom: 20px;
    border-radius: 8px;
    border: 1px solid rgba(100, 116, 139, 0.2);
}

.intel-matrix {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.78rem;
    min-width: 700px;
}

.intel-matrix th, .intel-matrix td {
    padding: 8px 6px;
    text-align: center;
    border: 1px solid rgba(100, 116, 139, 0.15);
}

.intel-matrix thead th {
    background: rgba(15, 23, 42, 0.9);
    color: #94a3b8;
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 2;
    font-size: 0.7rem;
    letter-spacing: 0.5px;
}

.intel-matrix thead th.rotate-header {
    writing-mode: vertical-lr;
    text-orientation: mixed;
    transform: rotate(180deg);
    padding: 10px 4px;
    min-height: 80px;
    font-size: 0.7rem;
}

.intel-matrix tbody th {
    background: rgba(15, 23, 42, 0.7);
    color: #e2e8f0;
    text-align: left;
    padding-left: 10px;
    font-weight: 500;
    white-space: nowrap;
}

.intel-matrix .eff-cell {
    font-weight: 700;
    border-radius: 0;
    min-width: 55px;
}

.eff-cell.eff-0   { background: rgba(0, 0, 0, 0.4); color: #334155; }
.eff-cell.eff-low  { background: rgba(239, 68, 68, 0.15); color: #f87171; }
.eff-cell.eff-mid  { background: rgba(251, 191, 36, 0.12); color: #fbbf24; }
.eff-cell.eff-std  { background: rgba(96, 165, 250, 0.12); color: #60a5fa; }
.eff-cell.eff-high { background: rgba(0, 255, 136, 0.15); color: #00ff88; }
.eff-cell.eff-max  { background: rgba(0, 255, 136, 0.25); color: #00ff88; font-size: 0.88rem; }

.eff-label {
    display: block;
    font-size: 0.6rem;
    font-weight: 400;
    color: #64748b;
    margin-top: 1px;
}

/* --- Passive Tower Cards --- */
.intel-passive-cards {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 12px;
    margin-bottom: 20px;
}

.intel-passive-card {
    background: rgba(15, 23, 42, 0.7);
    border: 1px solid rgba(100, 116, 139, 0.2);
    border-radius: 8px;
    padding: 12px;
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.intel-passive-icon {
    font-size: 1.6rem;
    width: 38px;
    text-align: center;
    flex-shrink: 0;
}

.intel-passive-card h4 {
    color: #e2e8f0;
    font-size: 0.85rem;
    margin: 0 0 4px 0;
}

.intel-passive-card p {
    color: #94a3b8;
    font-size: 0.78rem;
    margin: 0;
    line-height: 1.4;
}

/* --- Key Principle Box --- */
.intel-principle {
    background: linear-gradient(135deg, rgba(0, 255, 136, 0.08), rgba(59, 130, 246, 0.08));
    border: 1px solid rgba(0, 255, 136, 0.25);
    border-radius: 10px;
    padding: 16px;
    display: flex;
    align-items: center;
    gap: 14px;
    margin-top: 20px;
    margin-bottom: 30px;
}

.intel-principle-icon {
    font-size: 2rem;
    flex-shrink: 0;
}

.intel-principle strong {
    color: #00ff88;
    font-size: 0.9rem;
}

.intel-principle div {
    color: #cbd5e1;
    font-size: 0.85rem;
    line-height: 1.5;
}

/* --- Level intro buttons row --- */
.intro-buttons {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin-top: 16px;
}

/* --- Floating in-game intel button --- */
#intel-btn-float {
    position: fixed;
    top: 60px;
    right: 20px;
    z-index: 100;
}

#intel-btn-float .btn-icon {
    background: rgba(15, 23, 42, 0.85);
    border: 1px solid rgba(0, 255, 136, 0.3);
    color: #00ff88;
    font-size: 1.2rem;
    width: 40px;
    height: 40px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s;
}

#intel-btn-float .btn-icon:hover {
    background: rgba(0, 255, 136, 0.15);
    border-color: #00ff88;
}