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

:root {
    --primary-color: #6366f1;
    --secondary-color: #ec4899;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --border-color: #334155;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--bg-dark) 0%, #1a1f3a 100%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
}

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

header {
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: 15px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

header h1 {
    font-size: 2.5em;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

header p {
    font-size: 1.1em;
    opacity: 0.95;
}

/* Navigation */
.game-selector {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    flex-wrap: wrap;
    justify-content: center;
}

.nav-btn {
    padding: 12px 24px;
    border: 2px solid var(--primary-color);
    background: transparent;
    color: var(--primary-color);
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    font-weight: 600;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background: var(--primary-color);
    color: white;
    transform: translateY(-2px);
}

.nav-btn.active {
    background: var(--primary-color);
    color: white;
}

/* Game Sections */
.game-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.game-section.active {
    display: block;
}

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

/* Home Screen */
.home-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    padding: 20px 0;
}

.game-card {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 15px;
    padding: 30px;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.game-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(99, 102, 241, 0.2);
}

.game-card h2 {
    font-size: 1.8em;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.game-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}

.game-card ul {
    list-style: none;
    margin-bottom: 25px;
}

.game-card li {
    padding: 8px 0;
    color: var(--text-secondary);
}

.play-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.play-btn:hover {
    transform: scale(1.02);
    box-shadow: 0 10px 25px rgba(99, 102, 241, 0.3);
}

/* Stock Trader */
.trader-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.trader-header h2 {
    font-size: 2em;
}

.back-btn {
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.back-btn:hover {
    background: var(--secondary-color);
    transform: translateX(-5px);
}

.trader-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-box {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
}

.stat-box label {
    display: block;
    color: var(--text-secondary);
    margin-bottom: 10px;
    font-size: 0.95em;
}

.stat-value {
    font-size: 1.8em;
    font-weight: 700;
    color: var(--primary-color);
}

.search-section {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
}

.search-section input {
    flex: 1;
    padding: 12px;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1em;
    transition: all 0.3s ease;
}

.search-section input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.2);
}

.search-section button {
    padding: 12px 30px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.search-section button:hover {
    background: var(--secondary-color);
}

.stock-info {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 25px;
    margin-bottom: 30px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
}

.stock-details h3 {
    font-size: 1.5em;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.price-info {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.price-info div {
    font-size: 1.1em;
    color: var(--text-secondary);
}

.price-info div span {
    color: var(--text-primary);
    font-weight: 600;
}

.trade-section {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-group label {
    color: var(--text-secondary);
    font-weight: 600;
}

.input-group input {
    padding: 10px;
    background: var(--bg-dark);
    border: 2px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 1em;
}

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

#totalCost {
    font-size: 1.2em;
    color: var(--primary-color);
    font-weight: 600;
}

.button-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 10px;
}

.buy-btn, .sell-btn {
    padding: 12px;
    border: none;
    border-radius: 8px;
    color: white;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1em;
}

.buy-btn {
    background: var(--success-color);
}

.buy-btn:hover {
    background: #059669;
    transform: scale(1.02);
}

.sell-btn {
    background: var(--danger-color);
}

.sell-btn:hover {
    background: #dc2626;
    transform: scale(1.02);
}

.portfolio-section {
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 25px;
}

.portfolio-section h3 {
    margin-bottom: 20px;
    font-size: 1.3em;
}

.portfolio-list {
    display: grid;
    gap: 15px;
}

.portfolio-item {
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr 1fr;
    gap: 15px;
    align-items: center;
}

.portfolio-item-info {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

.portfolio-item-info strong {
    color: var(--primary-color);
}

.portfolio-item-info small {
    color: var(--text-secondary);
}

.portfolio-item-sell {
    text-align: right;
}

.portfolio-item-sell button {
    padding: 8px 16px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.portfolio-item-sell button:hover {
    background: #dc2626;
}

.empty {
    text-align: center;
    color: var(--text-secondary);
    padding: 20px;
}

/* Memory Game */
.memory-container {
    max-width: 600px;
    margin: 0 auto;
}

.memory-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.memory-header h2 {
    font-size: 2em;
}

.difficulty-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 15px;
    margin-bottom: 30px;
}

.difficulty-btn {
    padding: 15px;
    background: var(--bg-card);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.difficulty-btn:hover {
    border-color: var(--primary-color);
    background: var(--primary-color);
}

.memory-stats {
    display: flex;
    justify-content: space-around;
    margin-bottom: 30px;
    padding: 20px;
    background: var(--bg-card);
    border-radius: 10px;
    border: 2px solid var(--border-color);
}

.memory-stats div {
    text-align: center;
    font-weight: 600;
}

.memory-board {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 10px;
    margin-bottom: 30px;
}

.memory-card {
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5em;
    transition: all 0.3s ease;
    transform-style: preserve-3d;
}

.memory-card:hover {
    transform: scale(1.05);
}

.memory-card.flipped {
    background: var(--bg-card);
    border-color: var(--primary-color);
}

.memory-card.matched {
    opacity: 0.5;
    cursor: default;
}

/* Messages */
.message {
    padding: 15px;
    border-radius: 8px;
    margin-top: 20px;
    text-align: center;
    font-weight: 600;
    display: none;
}

.message.show {
    display: block;
    animation: slideDown 0.3s ease;
}

.message.success {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success-color);
    border: 2px solid var(--success-color);
}

.message.error {
    background: rgba(239, 68, 68, 0.2);
    color: var(--danger-color);
    border: 2px solid var(--danger-color);
}

.message.info {
    background: rgba(99, 102, 241, 0.2);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }

    .stock-info {
        grid-template-columns: 1fr;
    }

    .portfolio-item {
        grid-template-columns: 1fr;
    }

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

    .trader-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }

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

    .search-section input,
    .search-section button {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }

    header {
        padding: 20px 10px;
    }

    header h1 {
        font-size: 1.5em;
    }

    .game-card {
        padding: 20px;
    }

    .memory-board {
        gap: 8px;
    }

    .memory-card {
        font-size: 2em;
    }
}