/* ============================================
   UPTRIV - Daily Brain Training
   ============================================ */

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-card: #1a1a24;
    --bg-hover: #22222e;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;
    --border: #2a2a3a;
    --accent-news: #FF6B6B;
    --accent-history: #4ECDC4;
    --accent-science: #45B7D1;
    --accent-entertainment: #96CEB4;
    --accent-sports: #FFEAA7;
    --accent-primary: #667eea;
    --accent-secondary: #764ba2;
    --success: #22c55e;
    --error: #ef4444;
    --warning: #eab308;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   HEADER & NAV
   ============================================ */

header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 15, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-brain {
    width: 44px;
    height: 44px;
}

.logo-brain svg {
    width: 100%;
    height: 100%;
}

.logo-text {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary), #f093fb);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--text-primary);
}

/* Auth Section */
.auth-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.auth-loading {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.auth-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.2s;
}

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

.auth-btn svg {
    flex-shrink: 0;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid var(--border);
    object-fit: cover;
}

.user-name {
    font-weight: 500;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.logout-btn {
    padding: 0.4rem 0.75rem;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.8rem;
    transition: all 0.2s;
}

.logout-btn:hover {
    background: var(--error);
    border-color: var(--error);
    color: white;
}

/* ============================================
   FOOTER
   ============================================ */

footer {
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    margin-top: auto;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
    padding: 6rem 2rem;
    text-align: center;
    background: radial-gradient(ellipse at top, rgba(102, 126, 234, 0.15) 0%, transparent 60%);
}

.hero-content {
    max-width: 700px;
    margin: 0 auto;
}

.hero-brain {
    margin-bottom: 2rem;
}

.hero-brain-svg {
    width: 180px;
    height: 180px;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

.hero-brain-svg .brain-section {
    animation: pulse-section 4s ease-in-out infinite;
}

.hero-brain-svg .s1 { animation-delay: 0s; }
.hero-brain-svg .s2 { animation-delay: 0.7s; }
.hero-brain-svg .s3 { animation-delay: 1.4s; }
.hero-brain-svg .s4 { animation-delay: 2.1s; }
.hero-brain-svg .s5 { animation-delay: 2.8s; }
.hero-brain-svg .s6 { animation-delay: 3.5s; }

@keyframes pulse-section {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 0.9; }
}

.hero h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #fff 0%, #a0a0b0 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: 2.5rem;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 1rem 2rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(102, 126, 234, 0.5);
}

/* ============================================
   CATEGORIES PREVIEW
   ============================================ */

.categories-preview {
    padding: 4rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.categories-preview h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    text-align: center;
    margin-bottom: 3rem;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.category-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    text-align: center;
    transition: transform 0.2s, border-color 0.2s;
}

.category-card:hover {
    transform: translateY(-4px);
    border-color: var(--cat-color);
}

.category-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 1rem;
    background: linear-gradient(135deg, var(--cat-color), transparent);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.category-icon svg {
    width: 30px;
    height: 30px;
    stroke: var(--cat-color);
}

.category-card h3 {
    font-family: 'Space Grotesk', sans-serif;
    color: var(--cat-color);
    margin-bottom: 0.5rem;
}

.category-topics {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* ============================================
   HOW IT WORKS
   ============================================ */

.how-it-works {
    padding: 4rem 2rem;
    background: var(--bg-secondary);
}

.how-it-works h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    text-align: center;
    margin-bottom: 3rem;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.step {
    text-align: center;
    padding: 2rem;
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1rem;
}

.step h3 {
    font-family: 'Space Grotesk', sans-serif;
    margin-bottom: 0.5rem;
}

.step p {
    color: var(--text-secondary);
}

/* ============================================
   GAME SCREENS
   ============================================ */

.game-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.game-screen {
    display: none;
    width: 100%;
    max-width: 600px;
}

.game-screen.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

/* Login Screen */
.login-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 3rem;
    text-align: center;
}

.login-brain {
    width: 100px;
    height: 100px;
    margin: 0 auto 1.5rem;
}

.login-brain svg {
    width: 100%;
    height: 100%;
}

.login-card h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.login-card p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

#login-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#username-input {
    padding: 1rem 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1rem;
    text-align: center;
    outline: none;
    transition: border-color 0.2s;
}

#username-input:focus {
    border-color: var(--accent-primary);
}

.play-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 1rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.play-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

/* Countdown Screen */
#countdown-screen {
    text-align: center;
}

.countdown-display {
    padding: 4rem;
}

.countdown-number {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
    transition: transform 0.3s;
}

.countdown-number.pulse {
    transform: scale(1.2);
}

.countdown-display p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-top: 1rem;
}

/* Game Screen */
#game-screen {
    max-width: 700px;
}

.game-header {
    margin-bottom: 2rem;
}

.progress-bar {
    height: 4px;
    background: var(--bg-secondary);
    border-radius: 2px;
    margin-bottom: 1rem;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    transition: width 0.3s;
}

.game-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.question-counter {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1rem;
    color: var(--text-secondary);
}

.category-badge {
    padding: 0.5rem 1rem;
    background: rgba(102, 126, 234, 0.2);
    border-radius: 20px;
    font-weight: 500;
    font-size: 0.9rem;
}

.category-badge .category-name {
    color: var(--cat-color, var(--accent-primary));
}

.timer {
    display: flex;
    align-items: center;
    gap: 5px;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    transition: color 0.2s;
}

.timer.danger {
    color: var(--error);
    animation: shake 0.3s infinite;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-2px); }
    75% { transform: translateX(2px); }
}

.question-area {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.question-text {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.35rem;
    text-align: center;
    line-height: 1.5;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

.option-btn {
    padding: 1.25rem 1rem;
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    animation: slideUp 0.3s ease backwards;
}

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

.option-btn:hover:not(:disabled) {
    background: var(--bg-hover);
    border-color: var(--accent-primary);
}

.option-btn:disabled {
    cursor: default;
}

.option-btn.selected {
    border-color: var(--accent-primary);
    background: rgba(102, 126, 234, 0.2);
}

.option-btn.correct {
    border-color: var(--success);
    background: rgba(34, 197, 94, 0.2);
}

.option-btn.incorrect {
    border-color: var(--error);
    background: rgba(239, 68, 68, 0.2);
}

/* Answer Feedback */
.answer-feedback {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: 20px;
    padding: 2rem 3rem;
    text-align: center;
    opacity: 0;
    pointer-events: none;
    transition: all 0.3s ease;
    z-index: 200;
}

.answer-feedback.show {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

.answer-feedback.correct {
    border-color: var(--success);
}

.answer-feedback.correct .feedback-icon {
    color: var(--success);
}

.answer-feedback.incorrect {
    border-color: var(--error);
}

.answer-feedback.incorrect .feedback-icon {
    color: var(--error);
}

.feedback-text {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 0.5rem;
}

.correct-answer {
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* Results Screen */
.results-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 3rem;
    text-align: center;
}

.results-card h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    margin-bottom: 2rem;
}

.score-display {
    margin-bottom: 2rem;
}

.score-circle {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: var(--bg-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    border: 4px solid var(--border);
}

.score-circle.perfect {
    border-color: var(--success);
    box-shadow: 0 0 30px rgba(34, 197, 94, 0.3);
}

.score-circle.good {
    border-color: var(--accent-primary);
    box-shadow: 0 0 30px rgba(102, 126, 234, 0.3);
}

.score-circle.needs-work {
    border-color: var(--warning);
}

.score-number {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1;
}

.score-label {
    color: var(--text-muted);
    font-size: 1.25rem;
}

.results-breakdown {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border-radius: 10px;
    animation: slideUp 0.3s ease backwards;
}

.result-category {
    font-weight: 500;
}

.result-icon {
    font-size: 1.25rem;
}

.result-item.correct .result-icon {
    color: var(--success);
}

.result-item.incorrect .result-icon {
    color: var(--error);
}

.results-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.come-back {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Already Played Screen */
.already-played-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 24px;
    padding: 3rem;
    text-align: center;
}

.check-icon {
    color: var(--success);
    margin-bottom: 1.5rem;
}

.already-played-card h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
}

.already-played-card p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.already-played-actions {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 1.5rem;
    border-radius: 10px;
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

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

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

/* ============================================
   PROFILE / BRAIN MAP
   ============================================ */

.profile-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.profile-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.profile-header h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
}

.username-lookup {
    display: flex;
    gap: 0.5rem;
}

.username-lookup input {
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.9rem;
    outline: none;
}

.username-lookup input:focus {
    border-color: var(--accent-primary);
}

/* Loading & No Data States */
.loading-state,
.no-data-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 3px solid var(--border);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.no-data-icon {
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.no-data-state h2 {
    font-family: 'Space Grotesk', sans-serif;
    margin-bottom: 0.5rem;
}

.no-data-state p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* Brain Map Section */
.brain-map-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 2rem;
}

.brain-visualization {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.brain-svg {
    width: 100%;
    max-width: 400px;
    height: auto;
}

.brain-section {
    transition: opacity 0.5s ease;
}

/* Stats Panel */
.stats-panel {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 2rem;
}

.overall-score {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border);
}

.overall-circle {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    background: conic-gradient(var(--accent-primary) 0deg, var(--bg-secondary) 0deg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    position: relative;
}

.overall-circle::before {
    content: '';
    position: absolute;
    width: 90px;
    height: 90px;
    background: var(--bg-card);
    border-radius: 50%;
}

.overall-pct {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.75rem;
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.overall-label {
    font-weight: 500;
    color: var(--text-secondary);
}

.games-played {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* Category Bars */
.category-bars {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.category-bar {
    font-size: 0.9rem;
}

.bar-header {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.4rem;
}

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

.bar-pct {
    color: var(--text-secondary);
}

.bar-track {
    height: 8px;
    background: var(--bg-secondary);
    border-radius: 4px;
    overflow: hidden;
}

.bar-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.5s ease;
}

.bar-detail {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

/* Insights Section */
.insights-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.insight-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
}

.insight-card h3 {
    font-family: 'Space Grotesk', sans-serif;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.insight-card.strengths h3 {
    color: var(--success);
}

.insight-card.weaknesses h3 {
    color: var(--warning);
}

.insight-card ul {
    list-style: none;
}

.insight-card li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}

.insight-card li:last-child {
    border-bottom: none;
}

.insight-card li.no-data {
    color: var(--text-muted);
    font-style: italic;
    justify-content: center;
}

.insight-tag {
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 500;
}

.insight-pct {
    font-weight: 600;
    color: var(--text-secondary);
}

/* ============================================
   SUBCATEGORY BREAKDOWN
   ============================================ */

.subcategory-section {
    margin-top: 2rem;
}

.section-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.section-title svg {
    color: var(--accent-primary);
}

.section-subtitle {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.95rem;
}

.subcategory-breakdown {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.no-data-text {
    text-align: center;
    color: var(--text-muted);
    font-style: italic;
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
}

.subcat-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
}

.subcat-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    cursor: pointer;
    border-left: 4px solid var(--accent-primary);
    transition: background 0.2s;
}

.subcat-card-header:hover {
    background: var(--bg-hover);
}

.subcat-cat-name {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: 1rem;
}

.subcat-expand {
    color: var(--text-muted);
    font-size: 0.75rem;
    transition: transform 0.3s;
}

.subcat-card-body {
    padding: 0 1.25rem 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    transition: all 0.3s ease;
}

.subcat-card-body.collapsed {
    max-height: 0;
    padding: 0 1.25rem;
    overflow: hidden;
}

.subcat-item {
    display: grid;
    grid-template-columns: 1fr 60px 50px;
    gap: 0.75rem;
    align-items: center;
    padding: 0.75rem;
    background: var(--bg-secondary);
    border-radius: 8px;
}

.subcat-info {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.subcat-name {
    font-weight: 500;
    font-size: 0.9rem;
}

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

.subcat-bar-track {
    height: 6px;
    background: var(--bg-primary);
    border-radius: 3px;
    overflow: hidden;
}

.subcat-bar-fill {
    height: 100%;
    border-radius: 3px;
    transition: width 0.5s ease;
}

.subcat-pct {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: 0.9rem;
    text-align: right;
}

.subcat-pct.high {
    color: var(--success);
}

.subcat-pct.medium {
    color: var(--warning);
}

.subcat-pct.low {
    color: var(--error);
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 900px) {
    .brain-map-section {
        grid-template-columns: 1fr;
    }

    .insights-section {
        grid-template-columns: 1fr;
    }

    .subcat-item {
        grid-template-columns: 1fr 50px 45px;
        gap: 0.5rem;
    }

    .subcat-name {
        font-size: 0.85rem;
    }
}

@media (max-width: 768px) {
    nav {
        padding: 1rem;
    }

    .logo-text {
        font-size: 1.5rem;
    }

    .nav-links {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .hero {
        padding: 3rem 1rem;
    }

    .hero h1 {
        font-size: 2.25rem;
    }

    .hero-brain-svg {
        width: 140px;
        height: 140px;
    }

    .categories-preview,
    .how-it-works {
        padding: 2rem 1rem;
    }

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

    .question-text {
        font-size: 1.15rem;
    }

    .profile-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .username-lookup {
        width: 100%;
    }

    .username-lookup input {
        flex: 1;
    }
}

/* ============================================
   HISTORY PAGE
   ============================================ */

.history-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.history-header {
    text-align: center;
    margin-bottom: 2rem;
}

.history-header h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.history-subtitle {
    color: var(--text-secondary);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.game-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    animation: slideUp 0.3s ease backwards;
}

.game-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    transition: background 0.2s;
}

.game-card-header:hover {
    background: var(--bg-hover);
}

.game-date-score {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.game-date {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    font-size: 1rem;
}

.game-score {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.game-preview {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.emoji-preview {
    display: flex;
    gap: 6px;
    align-items: center;
}

.preview-emoji {
    font-size: 1rem;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    border: 2px solid var(--border);
    background: var(--bg-secondary);
}

.preview-emoji.correct {
    border-color: var(--success);
    background: rgba(34, 197, 94, 0.15);
}

.preview-emoji.incorrect {
    border-color: var(--error);
    background: rgba(239, 68, 68, 0.15);
}

.share-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s;
}

.share-btn:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.expand-icon {
    color: var(--text-muted);
    transition: transform 0.3s;
}

.game-card.expanded .expand-icon {
    transform: rotate(180deg);
}

.game-card-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
    border-top: 1px solid transparent;
}

.game-card.expanded .game-card-details {
    max-height: 1000px;
    border-top-color: var(--border);
}

.result-row {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    align-items: start;
}

.result-row:last-child {
    border-bottom: none;
}

.result-row .result-category {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.cat-emoji-box {
    font-size: 1.25rem;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    border: 3px solid var(--border);
    background: var(--bg-secondary);
    flex-shrink: 0;
}

.cat-emoji-box.correct {
    border-color: var(--success);
    background: rgba(34, 197, 94, 0.1);
}

.cat-emoji-box.incorrect {
    border-color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

.cat-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.result-question .question-text {
    font-size: 0.95rem;
    margin-bottom: 0.75rem;
    text-align: left;
    line-height: 1.5;
}

.answers {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.correct-answer,
.user-answer {
    display: flex;
    gap: 0.5rem;
    font-size: 0.85rem;
}

.answer-label {
    color: var(--text-muted);
    flex-shrink: 0;
}

.correct-answer .answer-value {
    color: var(--success);
    font-weight: 500;
}

.user-answer .answer-value {
    color: var(--error);
}

/* Share Toast */
.share-toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-card);
    border: 1px solid var(--success);
    border-radius: 10px;
    padding: 0.75rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--success);
    font-weight: 500;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
}

.share-toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

@media (max-width: 768px) {
    .history-container {
        padding: 1rem;
    }

    .game-card-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .game-preview {
        width: 100%;
        justify-content: space-between;
    }

    .result-row {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .result-row .result-category {
        justify-content: flex-start;
    }

    .preview-emoji {
        width: 26px;
        height: 26px;
        font-size: 0.85rem;
    }

    .emoji-preview {
        gap: 4px;
    }
}

/* ============================================
   FRIENDS PAGE
   ============================================ */

.friends-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.friends-header {
    text-align: center;
    margin-bottom: 2rem;
}

.friends-header h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.friends-subtitle {
    color: var(--text-secondary);
}

.friends-content {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.friends-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
}

.friends-section h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.25rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.badge {
    background: var(--accent-primary);
    color: white;
    padding: 0.15rem 0.5rem;
    border-radius: 10px;
    font-size: 0.75rem;
    font-weight: 600;
}

.search-box {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.search-box input {
    flex: 1;
    padding: 0.75rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
}

.search-box input:focus {
    border-color: var(--accent-primary);
}

.search-results,
.friends-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.friend-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 10px;
    animation: slideUp 0.3s ease backwards;
}

.friend-card.pending {
    border-color: var(--accent-primary);
    background: rgba(102, 126, 234, 0.1);
}

.friend-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.friend-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid var(--border);
    object-fit: cover;
}

.friend-details {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.friend-name {
    font-weight: 600;
    font-size: 1rem;
}

.friend-stats {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.friend-actions {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.btn-sm {
    padding: 0.4rem 0.75rem;
    font-size: 0.8rem;
}

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

.btn-danger:hover {
    background: var(--error);
    color: white;
}

.status-badge {
    padding: 0.35rem 0.75rem;
    border-radius: 15px;
    font-size: 0.8rem;
    font-weight: 500;
}

.status-badge.friend {
    background: rgba(34, 197, 94, 0.2);
    color: var(--success);
}

.status-badge.pending {
    background: rgba(234, 179, 8, 0.2);
    color: var(--warning);
}

@media (max-width: 768px) {
    .friends-container {
        padding: 1rem;
    }

    .friend-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .friend-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .search-box {
        flex-direction: column;
    }
}

/* Invite Result Styles */
.invite-result {
    margin-top: 1rem;
}

.invite-result .success-text {
    color: var(--success);
    font-weight: 500;
}

.invite-result .error-text {
    color: var(--error);
    font-weight: 500;
}

.invite-result .invite-link {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.invite-result .invite-link input {
    width: 100%;
    margin-top: 0.5rem;
    padding: 0.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.8rem;
}

/* ============================================
   LEADERBOARD PAGE
   ============================================ */

.leaderboard-container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

.leaderboard-header {
    text-align: center;
    margin-bottom: 2rem;
}

.leaderboard-header h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.leaderboard-subtitle {
    color: var(--text-secondary);
}

.leaderboard-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
}

.tab-btn {
    padding: 0.6rem 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 25px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    white-space: nowrap;
}

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

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

.leaderboard-table {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}

.leaderboard-row {
    display: grid;
    grid-template-columns: 60px 1fr 100px 80px;
    align-items: center;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    transition: background 0.2s;
}

.leaderboard-row:last-child {
    border-bottom: none;
}

.leaderboard-row:hover {
    background: var(--bg-hover);
}

.leaderboard-row.current-user {
    background: rgba(102, 126, 234, 0.1);
    border-left: 4px solid var(--accent-primary);
}

.rank {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-muted);
}

.rank.gold { color: #FFD700; }
.rank.silver { color: #C0C0C0; }
.rank.bronze { color: #CD7F32; }

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.leaderboard-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 2px solid var(--border);
    object-fit: cover;
}

.leaderboard-username {
    font-weight: 600;
}

.games-count {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: center;
}

.score-pct {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.1rem;
    font-weight: 700;
    text-align: right;
}

.score-pct.high { color: var(--success); }
.score-pct.medium { color: var(--warning); }
.score-pct.low { color: var(--error); }

.no-friends-message {
    text-align: center;
    padding: 3rem 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
}

.no-friends-message h3 {
    font-family: 'Space Grotesk', sans-serif;
    margin-bottom: 0.5rem;
}

.no-friends-message p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

@media (max-width: 768px) {
    .leaderboard-container {
        padding: 1rem;
    }

    .leaderboard-row {
        grid-template-columns: 50px 1fr 70px;
        padding: 1rem;
    }

    .games-count {
        display: none;
    }

    .leaderboard-avatar {
        width: 32px;
        height: 32px;
    }
}

/* ============================================
   MOBILE OPTIMIZATIONS
   ============================================ */

@media (max-width: 600px) {
    /* Game container */
    .game-container {
        padding: 1rem;
    }

    /* Login/Ready cards */
    .login-card {
        padding: 1.5rem;
        margin: 0.5rem;
    }

    .login-card h2 {
        font-size: 1.5rem;
    }

    .login-brain {
        width: 100px;
        height: 100px;
    }

    /* Game screen */
    .game-header {
        margin-bottom: 1rem;
    }

    .game-info {
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .question-counter {
        font-size: 0.9rem;
    }

    .category-badge {
        padding: 0.4rem 0.8rem;
        font-size: 0.8rem;
    }

    .timer {
        font-size: 1rem;
    }

    /* Question area */
    .question-area {
        padding: 1.25rem;
        margin-bottom: 1rem;
        min-height: 80px;
    }

    .question-text {
        font-size: 1.1rem;
        line-height: 1.4;
    }

    /* Options - touch friendly */
    .options-grid {
        gap: 0.75rem;
    }

    .option-btn {
        padding: 1rem;
        font-size: 0.95rem;
        min-height: 50px;
        -webkit-tap-highlight-color: transparent;
    }

    /* Results screen */
    .results-card {
        padding: 1.5rem;
    }

    .score-circle {
        width: 100px;
        height: 100px;
    }

    .score-number {
        font-size: 2rem;
    }

    .results-breakdown {
        gap: 0.5rem;
    }

    .result-item {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    /* Already played screen */
    .already-played-card {
        padding: 1.5rem;
    }

    .check-icon svg {
        width: 60px;
        height: 60px;
    }

    /* History page */
    .history-container {
        padding: 1rem;
    }

    .history-header h1 {
        font-size: 1.5rem;
    }

    .game-card-header {
        padding: 1rem;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .game-date {
        font-size: 0.9rem;
    }

    .emoji-preview {
        gap: 0.25rem;
    }

    .preview-emoji {
        font-size: 1.1rem;
        padding: 0.25rem;
    }

    /* Profile page */
    .profile-container {
        padding: 1rem;
    }

    .brain-svg {
        max-width: 280px;
    }

    /* Friends page */
    .friends-container {
        padding: 1rem;
    }

    .friend-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }

    .friend-actions {
        width: 100%;
        justify-content: flex-start;
    }

    /* Buttons */
    .play-button {
        padding: 0.9rem 2rem;
        font-size: 1rem;
    }

    .btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    .btn-sm {
        padding: 0.5rem 0.8rem;
        font-size: 0.8rem;
    }
}

/* Very small phones */
@media (max-width: 380px) {
    .game-info {
        justify-content: center;
    }

    .question-text {
        font-size: 1rem;
    }

    .option-btn {
        padding: 0.85rem;
        font-size: 0.9rem;
    }

    .nav-links {
        gap: 0.5rem;
        font-size: 0.8rem;
    }

    .logo-text {
        font-size: 1.25rem;
    }
}