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

:root {
    --primary-color: #6366f1;
    --secondary-color: #ec4899;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark-bg: #0f172a;
    --light-bg: #f8fafc;
    --card-bg: #ffffff;
    --border-color: #e2e8f0;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0f1621 0%, #1a2847 25%, #2d4a7a 50%, #1a2847 75%, #0f1621 100%);
    background-attachment: fixed;
    color: var(--text-dark);
    min-height: 100vh;
    overflow-x: hidden;
    display: flex;
    flex-direction: column;
}

/* SCREENS */
.screen {
    display: none;
    width: 100%;
    height: 100vh;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    overflow: visible;
}

.screen.active {
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
}

/* Game screen usa layout diferente (sin centrado) */
#game-screen.active {
    display: block;
    align-items: stretch;
    justify-content: flex-start;
    background: linear-gradient(135deg, #0f1621 0%, #1a2847 25%, #2d4a7a 50%, #1a2847 75%, #0f1621 100%);
    background-attachment: fixed;
}

/* MENÚ PRINCIPAL */
.menu-container {
    max-width: 700px;
    width: 90%;
    background: white;
    border-radius: 20px;
    padding: 35px 40px;
    box-shadow: var(--shadow-lg);
    text-align: center;
    margin-top: 20px;
    margin-bottom: 120px;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
}

.title {
    font-size: 2.4rem;
    margin-bottom: 8px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.subtitle {
    font-size: 0.95rem;
    color: var(--text-light);
    margin-bottom: 25px;
}

.menu-content {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.section {
    text-align: left;
    position: relative;
}

.section h2 {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--text-dark);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 8px;
}

.button-group {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
}

.button-group.difficulty-group {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.menu-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 15px;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-dark);
}

.menu-btn:hover {
    border-color: var(--primary-color);
    background: #f0f4ff;
    transform: translateY(-3px);
}

.menu-btn.active {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #f0f4ff, #fef4ff);
    color: var(--primary-color);
}

.menu-btn .icon {
    font-size: 2.8rem;
}

.menu-btn .menu-text {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.menu-btn .menu-title {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-dark);
}

.menu-btn .menu-desc {
    font-size: 0.7rem;
    color: var(--text-light);
    font-weight: 400;
}

.menu-btn .desc {
    font-size: 0.75rem;
    color: var(--text-light);
    font-weight: 400;
}

/* Selector de Temas */
.theme-selector-btn {
    width: 100%;
    padding: 12px 20px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    margin-bottom: 10px;
}

.theme-selector-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(102, 126, 234, 0.2);
}

.theme-selector-btn:disabled {
    background: #f5f5f5;
    color: #999;
    border-color: #ddd;
    cursor: not-allowed;
    opacity: 0.6;
}

.theme-selector-btn:disabled:hover {
    border-color: #ddd;
    box-shadow: none;
}

.theme-selector-btn .dropdown-arrow {
    font-size: 0.8rem;
    color: var(--text-light);
    transition: transform 0.3s ease;
}

.theme-selector-btn:disabled .dropdown-arrow {
    color: #999;
}

.theme-selector-btn.active .dropdown-arrow {
    transform: rotate(180deg);
}

.theme-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: white;
    border: 2px solid var(--primary-color);
    border-radius: 10px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    margin-top: 5px;
    display: flex;
    flex-direction: column;
    max-height: 300px;
    overflow-y: auto;
}

.theme-dropdown.hidden {
    display: none;
}

.theme-option {
    padding: 12px 20px;
    background: none;
    border: none;
    text-align: left;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-dark);
    transition: all 0.2s ease;
    font-weight: 500;
}

.theme-option:hover {
    background: var(--primary-color);
    color: white;
}

.theme-option:first-child {
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
}

.theme-option:last-child {
    border-bottom-left-radius: 8px;
    border-bottom-right-radius: 8px;
}

/* Modal de Selección de Ámbito */
.theme-modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.theme-modal:not(.hidden) {
    pointer-events: all;
    opacity: 1;
}

.theme-modal.hidden {
    display: none;
}

.theme-modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
}

.theme-modal-content {
    position: relative;
    background: white;
    border-radius: 20px;
    padding: 30px;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    z-index: 10000;
    animation: slideInUp 0.3s ease;
}

@keyframes slideInUp {
    from {
        transform: translateY(50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.theme-modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border-color);
}

.theme-modal-header h2 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--text-dark);
    font-weight: 700;
}

.close-modal-btn {
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--text-light);
    cursor: pointer;
    padding: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s ease;
    line-height: 1;
}

.close-modal-btn:hover {
    background: #f5f5f5;
    color: var(--text-dark);
}

.theme-options-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

.theme-option-btn {
    padding: 20px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: 15px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-dark);
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    text-align: center;
    min-height: 70px;
}

.theme-option-btn:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1), rgba(118, 75, 162, 0.1));
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.2);
}

.theme-option-btn.selected {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

/* Botones de Dificultad más pequeños */
.difficulty-btn {
    padding: 12px !important;
    gap: 8px !important;
}

.difficulty-btn .menu-icon {
    font-size: 2.2rem !important;
}

.difficulty-btn .menu-title {
    font-size: 0.85rem !important;
}

.difficulty-btn .menu-desc {
    font-size: 0.65rem !important;
}

.start-btn, .info-btn {
    padding: 15px 50px;
    font-size: 1.2rem;
    font-weight: 700;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.start-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    margin-top: 15px;
    padding: 12px 30px;
    font-size: 1rem;
}

.start-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.start-btn:disabled {
    background: #ccc;
    color: #888;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.start-btn:disabled:hover {
    transform: none;
    box-shadow: none;
}

.info-btn {
    background: var(--light-bg);
    color: var(--text-dark);
    border: 2px solid var(--border-color);
}

.info-btn:hover {
    border-color: var(--primary-color);
    background: #f0f4ff;
}

/* TOOLTIP PARA BOTÓN DESHABILITADO */
.start-btn[disabled]::after {
    content: attr(title);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    background: #333;
    color: white;
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    white-space: nowrap;
    margin-bottom: 8px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.start-btn[disabled]:hover::after {
    opacity: 1;
}

/* PANTALLA DE INFORMACIÓN */
.info-container {
    max-width: 700px;
    width: 90%;
    background: white;
    border-radius: 20px;
    padding: 35px 40px;
    box-shadow: var(--shadow-lg);
    text-align: center;
    margin-top: 20px;
    margin-bottom: 120px;
    max-height: calc(100vh - 200px);
    overflow-y: auto;
    position: relative;
}

.info-container h1 {
    color: var(--primary-color);
    margin-bottom: 25px;
    font-size: 2rem;
    text-align: center;
    padding-top: 15px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--primary-color);
}

.info-content {
    text-align: left;
    line-height: 1.8;
    color: var(--text-dark);
}

.info-content h3 {
    color: var(--secondary-color);
    margin-top: 25px;
    margin-bottom: 15px;
}

.info-content p {
    margin-bottom: 15px;
    font-size: 1.05rem;
}

.info-content ul {
    margin-left: 25px;
    margin-bottom: 15px;
}

.info-content li {
    margin-bottom: 10px;
    font-size: 1.05rem;
}

.info-content a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.info-content a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

.info-footer {
    margin-top: 40px;
    padding-top: 30px;
    border-top: 2px solid var(--border-color);
    text-align: center;
}

.info-footer p {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--primary-color);
}

.docs-btn {
    display: inline-block;
    padding: 12px 28px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white !important;
    text-decoration: none !important;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.05rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.3);
}

.docs-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.4);
    color: white !important;
}

.back-btn {
    margin-top: 30px;
    padding: 12px 30px;
    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);
}

.back-btn-info {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    padding: 6px 10px;
    font-size: 1.2rem;
    z-index: 200;
}

.back-btn-info:hover {
    background: #dc2626;
    transform: scale(1.05);
}

.scroll-indicator {
    position: absolute;
    bottom: 15px;
    left: 50%;
    transform: translateX(-50%);
    opacity: 1;
    transition: opacity 0.3s ease;
    z-index: 100;
}

.scroll-indicator.hidden {
    opacity: 0;
    pointer-events: none;
}

.scroll-indicator .arrow {
    display: inline-block;
    font-size: 2.5rem;
    color: var(--primary-color);
    animation: bounce 2s infinite;
    font-weight: 900;
    text-shadow: 0 2px 8px rgba(102, 126, 234, 0.5);
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(8px);
    }
}

/* PANTALLA DE JUEGO */
.game-header {
    background: white;
    padding: 10px 20px;
    display: flex;
    flex-direction: row;
    gap: 0;
    box-shadow: none;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
    align-items: center;
    justify-content: space-between;
}

.game-header.danger-alert {
    animation: red-flash 0.5s infinite;
}

@keyframes red-flash {
    0%, 100% { background: white; }
    50% { background: #fee2e2; }
}

.header-title {
    text-align: center;
    padding-bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    flex: 1;
}

.header-title h1 {
    font-size: 1.5rem;
    margin: 0;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-title h2 {
    font-size: 0.75rem;
    color: var(--text-dark);
    margin: 0;
    font-weight: 600;
}

.quit-btn-header {
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    padding: 6px 10px;
    font-size: 1rem;
}

.quit-btn-header:hover {
    background: #dc2626;
    transform: scale(1.05);
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 10px;
}

.header-top h3 {
    color: var(--primary-color);
    margin: 0;
    font-size: 1.1rem;
}

.header-buttons {
    display: flex;
    gap: 8px;
    align-items: center;
    justify-content: center;
    margin-top: 6px;
    padding-top: 0;
}

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    text-align: center;
    padding: 6px 0;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
}

.stat-item .label {
    font-size: 0.7rem;
    color: var(--text-light);
    font-weight: 500;
}

.stat-item .value {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--primary-color);
}

.stop-btn {
    background: #f59e0b;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.stop-btn:hover {
    background: #d97706;
    transform: scale(1.05);
}

.quit-btn {
    background: var(--danger-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

.quit-btn:hover {
    background: #dc2626;
    transform: scale(1.05);
}

.game-container {
    display: grid;
    grid-template-columns: 1fr 1.5fr 1fr;
    gap: 20px;
    padding: 25px 40px;
    height: calc(100vh - 220px);
    overflow-y: auto;
}

@media (max-width: 1200px) {
    .game-container {
        grid-template-columns: 1fr;
        height: auto;
    }
}

/* PANEL DE ITEMS */
.items-panel {
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.panel-header {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 15px;
}

.panel-header h3 {
    color: var(--primary-color);
    margin-bottom: 0;
    font-size: 1.3rem;
}

.sort-controls {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.sort-btn {
    padding: 6px 12px;
    font-size: 0.85rem;
    font-weight: 600;
    border: 1px solid var(--border-color);
    background: white;
    color: var(--text-dark);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    flex: 1;
    min-width: 80px;
}

.sort-btn:hover {
    border-color: var(--primary-color);
    background: #f0f4ff;
    color: var(--primary-color);
    transform: translateY(-2px);
}

.sort-btn.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    cursor: pointer;
}

.sort-btn.active:hover {
    background: #4a5fd6;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(94, 114, 228, 0.3);
}

.toggle-ratios-btn {
    padding: 6px 12px;
    font-size: 0.85rem;
    font-weight: 600;
    border: 2px solid #ffc107;
    background: white;
    color: var(--text-dark);
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.3s ease;
    flex: 1;
    min-width: 100px;
}

.toggle-ratios-btn:hover {
    border-color: #ff9800;
    background: #fff8f0;
    color: #ff9800;
    transform: translateY(-2px);
}

.toggle-ratios-btn.active {
    background: #ffc107;
    color: white;
    border-color: #ffc107;
    cursor: pointer;
}

.toggle-ratios-btn.active:hover {
    background: #ffb300;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 193, 7, 0.3);
}

.items-list {
    display: grid;
    gap: 12px;
    flex: 1;
    overflow-y: auto;
}

.item {
    background: linear-gradient(135deg, #f8f9ff, #fff8fb);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 15px;
    cursor: grab;
    transition: all 0.3s ease;
    user-select: none;
    display: flex;
    align-items: center;
    gap: 12px;
}

.item:hover {
    border-color: var(--primary-color);
    background: linear-gradient(135deg, #f0f4ff, #fff0f8);
    box-shadow: var(--shadow);
}

.item.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

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

.item-details {
    flex: 1;
    min-width: 0;
}

.item-name {
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 5px;
}

.item-stats {
    display: flex;
    gap: 15px;
    font-size: 0.85rem;
    color: var(--text-light);
}

.item-stat {
    display: flex;
    gap: 5px;
}

.item-stat span:first-child {
    font-weight: 600;
}

.item-quantity {
    margin-left: auto;
    background: #f0f4ff;
    padding: 4px 12px;
    border-radius: 12px;
    font-weight: 700;
    color: var(--primary-color);
    font-size: 0.9rem;
    flex-shrink: 0;
}

.item-quantity.disabled {
    background: #d1d5db;
    color: #6b7280;
    opacity: 0.6;
}

.item.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    background: #f3f4f6;
    border-color: #d1d5db;
}

.item.disabled:hover {
    border-color: #d1d5db;
    background: #f3f4f6;
    box-shadow: none;
}

.panel-info {
    margin-top: 15px;
    padding: 15px;
    background: #f0f4ff;
    border-radius: 8px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 600;
}

/* PANEL DE MOCHILA */
.knapsack-panel {
    display: flex;
    justify-content: center;
}

.knapsack-container {
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 500px;
    display: flex;
    flex-direction: column;
}

.knapsack-header {
    text-align: center;
    margin-bottom: 15px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.knapsack-header h3 {
    color: var(--primary-color);
    font-size: 1.2rem;
    margin: 0;
}

.header-controls {
    display: flex;
    gap: 8px;
    align-items: center;
    justify-content: center;
}

.timer-display {
    background: var(--primary-color);
    color: white;
    padding: 6px 12px;
    border-radius: 6px;
    font-weight: 700;
    font-size: 0.9rem;
    min-width: 45px;
    text-align: center;
}

.timer-display.danger {
    background: var(--danger-color);
    animation: red-flash 0.5s infinite;
}

.control-btn {
    padding: 6px 10px;
    border: 1px solid var(--border-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
    font-size: 0.75rem;
}

.knapsack {
    border: 3px dashed var(--primary-color);
    border-radius: 12px;
    padding: 25px;
    min-height: 350px;
    background: linear-gradient(135deg, #f8f9ff, #fef0fb);
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    align-content: flex-start;
    overflow-y: auto;
}

.knapsack.full {
    background: linear-gradient(135deg, #fff5f5, #ffe5e5);
    border-color: var(--danger-color);
}

.knapsack-item {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 10px 15px;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.9rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: all 0.2s ease;
}

.knapsack-item:hover {
    background: linear-gradient(135deg, var(--secondary-color), var(--primary-color));
    transform: scale(1.02);
}

.knapsack-item-icon {
    font-size: 1.2rem;
}

.knapsack-item-remove {
    margin-left: auto;
    cursor: pointer;
    font-weight: 700;
    opacity: 0.7;
}

.knapsack-item-remove:hover {
    opacity: 1;
}

.knapsack-stats {
    display: flex;
    flex-direction: column;
    gap: 15px;
    padding: 15px;
    background: #f8fafc;
    border-radius: 8px;
    margin-bottom: 15px;
}

.stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
}

.stat .label {
    font-weight: 600;
    color: var(--text-dark);
}

.stat .value {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.3rem;
}

.weight-warning {
    padding: 12px;
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    border: 2px solid var(--warning-color);
    color: #92400e;
    border-radius: 8px;
    font-weight: 600;
    text-align: center;
    animation: bounce 0.5s ease;
}

.weight-warning.hidden {
    display: none;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

/* PANEL DE INFORMACIÓN */
.info-panel {
    background: white;
    border-radius: 15px;
    padding: 20px;
    box-shadow: var(--shadow);
    overflow-y: auto;
}

.info-panel h3 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.3rem;
}

.problem-info {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.info-stat {
    padding: 12px;
    background: #f8fafc;
    border-left: 4px solid var(--primary-color);
    border-radius: 4px;
}

.info-stat-label {
    font-weight: 600;
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 5px;
}

.info-stat-value {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.3rem;
}

.items-breakdown {
    margin-top: 15px;
    padding: 15px;
    background: #f8fafc;
    border-radius: 8px;
}

.items-breakdown h4 {
    margin-bottom: 10px;
    color: var(--text-dark);
    font-size: 0.95rem;
}

.item-break {
    display: flex;
    justify-content: space-between;
    padding: 5px 0;
    font-size: 0.85rem;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-light);
}

.item-break:last-child {
    border-bottom: none;
}

/* PANTALLA DE RESULTADOS */
.results-container {
    max-width: 1200px;
    width: 95%;
    background: white;
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    max-height: 90vh;
    overflow-y: auto;
}

.results-container h1 {
    text-align: center;
    color: var(--primary-color);
    font-size: 2.5rem;
    margin-bottom: 40px;
}

.results-content {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

@media (max-width: 768px) {
    .results-content {
        grid-template-columns: 1fr;
    }
}

.your-solution, .greedy-solution {
    background: #f8fafc;
    border-radius: 15px;
    padding: 25px;
    border: 2px solid var(--border-color);
}

.your-solution h2, .greedy-solution h2 {
    color: var(--primary-color);
    margin-bottom: 20px;
}

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

.solution-item {
    background: white;
    padding: 12px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 4px solid var(--primary-color);
}

.solution-item-name {
    font-weight: 600;
    color: var(--text-dark);
}

.solution-item-quantity {
    background: #f0f4ff;
    padding: 4px 10px;
    border-radius: 4px;
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.85rem;
}

.solution-stats {
    display: flex;
    flex-direction: column;
    gap: 12px;
    border-top: 2px solid var(--border-color);
    padding-top: 15px;
}

.divider {
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--text-light);
    font-size: 1.5rem;
}

@media (max-width: 768px) {
    .divider {
        display: none;
    }
}

.comparison {
    background: #f0f4ff;
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 30px;
    border: 2px solid var(--primary-color);
}

.comparison h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.comparison-text {
    font-size: 1.1rem;
    color: var(--text-dark);
    line-height: 1.8;
}

.comparison-text strong {
    color: var(--primary-color);
}

.comparison-text.success {
    color: var(--success-color);
}

.comparison-text.success strong {
    color: var(--success-color);
}

.buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
}

@media (max-width: 600px) {
    .buttons {
        flex-direction: column;
    }
}

.action-btn {
    padding: 15px 40px;
    font-size: 1.1rem;
    font-weight: 700;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
}

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

#replay-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

#menu-btn {
    background: var(--light-bg);
    color: var(--text-dark);
    border: 2px solid var(--border-color);
}

#menu-btn:hover {
    border-color: var(--primary-color);
    background: #f0f4ff;
}

/* MODAL */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal.hidden {
    display: none;
}

.modal-content {
    background: white;
    padding: 40px;
    border-radius: 15px;
    max-width: 400px;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.modal-content h2 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.modal-content p {
    color: var(--text-light);
    margin-bottom: 30px;
}

.modal-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.modal-btn {
    padding: 10px 25px;
    border: 2px solid var(--border-color);
    background: white;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: all 0.3s ease;
}

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

.modal-btn.danger {
    background: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
}

.modal-btn.danger:hover {
    background: #dc2626;
    border-color: #dc2626;
}

/* SCROLLBARS */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f5f9;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .menu-container {
        padding: 30px 20px;
    }

    .title {
        font-size: 2.5rem;
    }

    .game-container {
        grid-template-columns: 1fr;
        height: auto;
    }

    .stats {
        flex-direction: column;
        gap: 10px;
    }

    .results-container {
        padding: 20px;
    }
}

/* BOTÓN DE AYUDA FLOTANTE */
.help-button {
    position: fixed;
    bottom: 7rem;
    right: 2rem;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
    transition: all 0.3s ease;
    z-index: 999;
    font-size: 1.5rem;
    font-weight: bold;
}

.help-button:hover {
    transform: scale(1.1);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.6);
}

.help-button:active {
    transform: scale(0.95);
}

.help-icon {
    display: flex;
    align-items: center;
    justify-content: center;
}

/* FOOTER */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.98);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(102, 126, 234, 0.2);
    padding: 10px 15px;
    text-align: center;
    z-index: 150;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 5px;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-content p {
    margin: 0;
    color: #cbd5e1;
    font-size: 0.75rem;
}

.footer-content strong {
    color: #667eea;
}

.footer-links {
    display: flex;
    gap: 12px;
    align-items: center;
    justify-content: center;
}

.footer-links a {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    transition: all 0.2s ease;
    border: 1px solid rgba(102, 126, 234, 0.3);
}

.footer-links a:hover {
    background: rgba(102, 126, 234, 0.2);
    color: #764ba2;
    border-color: rgba(102, 126, 234, 0.6);
    transform: translateY(-2px);
}

.footer-links a svg {
    width: 14px;
    height: 14px;
}

/* En game-screen, el footer no debe interfere */
#game-screen {
    padding-bottom: 100px;
    background: var(--light-bg);
}