:root {
    --primary: #1a73e8;
    --secondary: #0d47a1;
    --accent: #ff5722;
    --laptop: #9c27b0;
    --monitor: #00bcd4;
    --peripheral: #ff9800;
    --budget: #4caf50;
    --performance: #ff9800;
    --enthusiast: #f44336;
    --bg: #f5f7fa;
    --card-bg: #ffffff;
    --text: #333333;
    --text-secondary: #666666;
    --border: #e0e0e0;
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --meter-bg: #f0f0f0;
    --hover: #f5f5f5;
    --table-hover: #f9f9f9;
    --port-bg: #f0f0f0;
    --desk-bg: #f5f5f5;
    --warning: #ff9800;
    --critical: #f44336;
    --success: #4caf50;
    --sidebar-width: 280px;
    --build-sidebar-width: 320px;
    --header-height: 80px;
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

.dark-mode {
    --primary: #4d8cff;
    --secondary: #1a5bbf;
    --accent: #ff7e4d;
    --laptop: #b85fd9;
    --monitor: #4dd0e1;
    --peripheral: #ffb74d;
    --budget: #66bb6a;
    --performance: #ffb74d;
    --enthusiast: #ef5350;
    --bg: #121212;
    --card-bg: #1e1e1e;
    --text: #e0e0e0;
    --text-secondary: #aaaaaa;
    --border: #333333;
    --shadow: 0 4px 20px rgba(0,0,0,0.3);
    --meter-bg: #333333;
    --hover: #2a2a2a;
    --table-hover: #2a2a2a;
    --port-bg: #2a2a2a;
    --desk-bg: #2a2a2a;
    --warning: #ffb74d;
    --critical: #ef5350;
    --success: #66bb6a;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    transition: background-color 0.3s, color 0.2s, border-color 0.2s;
}

body {
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

.container {
    max-width: 1800px;
    margin: 0 auto;
    padding: 15px;
}

header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 15px 25px;
    border-radius: var(--border-radius);
    margin-bottom: 15px;
    box-shadow: var(--shadow);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
}

.logo:hover {
    transform: scale(1.02);
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: 700;
}

.tagline {
    background: rgba(255,255,255,0.2);
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.search-bar {
    flex: 1;
    max-width: 500px;
    position: relative;
}

.search-bar i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #999;
    font-size: 1rem;
}

.search-bar input {
    width: 100%;
    padding: 12px 20px 12px 45px;
    border: none;
    border-radius: 30px;
    background: white;
    color: #333;
    font-size: 1rem;
    transition: var(--transition);
}

.search-bar input:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(255,255,255,0.3);
    transform: scale(1.02);
}

.dark-mode .search-bar input {
    background: #333;
    color: white;
}

.nav-menu {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 12px 20px;
    margin-bottom: 20px;
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
    box-shadow: var(--shadow);
    position: sticky;
    top: 10px;
    z-index: 100;
}

.nav-item {
    padding: 8px 16px;
    color: var(--text);
    text-decoration: none;
    font-weight: 600;
    border-radius: 6px;
    transition: var(--transition);
    font-size: 0.95rem;
}

.nav-item:hover {
    background: var(--hover);
    transform: translateY(-2px);
}

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

.main-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr var(--build-sidebar-width);
    gap: 20px;
    margin-top: 10px;
}

.category-sidebar {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow);
    height: fit-content;
    position: sticky;
    top: 90px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
}

.category-sidebar h3 {
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.2rem;
}

.category-section {
    margin-bottom: 10px;
}

.category-header {
    padding: 12px 15px;
    background: var(--hover);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    transition: var(--transition);
}

.category-header:hover {
    background: var(--border);
    transform: translateX(3px);
}

.category-header i:first-child {
    margin-right: 10px;
    color: var(--primary);
}

.category-items {
    display: none;
    padding: 10px 0 10px 35px;
}

.category-item {
    padding: 8px 15px;
    cursor: pointer;
    border-radius: 6px;
    font-size: 0.9rem;
    transition: var(--transition);
    margin-bottom: 2px;
}

.category-item:hover {
    background: var(--hover);
    transform: translateX(3px);
}

.category-item.active {
    background: var(--primary);
    color: white;
}

.bottleneck-sidebar-btn {
    width: 100%;
    padding: 15px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: var(--transition);
    font-size: 1rem;
}

.bottleneck-sidebar-btn:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow);
    background: #ff4500;
}

.main-content {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 25px;
    box-shadow: var(--shadow);
    min-height: 600px;
}

.products-section {
    margin-bottom: 40px;
    animation: fadeIn 0.5s ease;
}

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

.products-section:last-child {
    margin-bottom: 0;
}

.section-title {
    font-size: 1.6rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 3px solid var(--primary);
    padding-bottom: 10px;
    font-weight: 600;
}

.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.product-card {
    background: var(--card-bg);
    border: 2px solid var(--border);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
    position: relative;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.product-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    opacity: 0;
    transition: var(--transition);
    z-index: 1;
}

.product-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    border-color: var(--primary);
}

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

.product-card.selected {
    border-color: var(--primary);
    background: rgba(26,115,232,0.05);
    box-shadow: 0 0 0 2px var(--primary);
}

.product-card img {
    width: 100%;
    height: 200px;
    object-fit: contain;
    background: linear-gradient(145deg, #ffffff 0%, #f8f8f8 100%);
    padding: 20px;
    border-bottom: 1px solid var(--border);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    image-rendering: -webkit-optimize-contrast;
    image-rendering: crisp-edges;
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.08));
}

.dark-mode .product-card img {
    background: linear-gradient(145deg, #2d2d2d 0%, #232323 100%);
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.product-card:hover img {
    transform: scale(1.08);
    background: linear-gradient(145deg, #f0f0f0 0%, #e8e8e8 100%);
    filter: drop-shadow(0 8px 16px rgba(0, 0, 0, 0.12));
}

.dark-mode .product-card:hover img {
    background: linear-gradient(145deg, #383838 0%, #2d2d2d 100%);
}

.product-card img[src*=".jpg"],
.product-card img[src*=".png"] {
    mix-blend-mode: multiply;
}

.dark-mode .product-card img[src*=".jpg"],
.dark-mode .product-card img[src*=".png"] {
    mix-blend-mode: normal;
}

.product-info {
    padding: 16px;
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--card-bg);
}

.product-info h3 {
    font-size: 1.1rem;
    margin-bottom: 8px;
    color: var(--text);
    font-weight: 600;
    line-height: 1.4;
}

.product-specs {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 12px;
    line-height: 1.4;
    flex: 1;
}

.product-price {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent);
    margin: 10px 0;
    display: flex;
    align-items: center;
    gap: 4px;
}

.product-price::before {
    content: '₱';
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin-right: 2px;
}

.product-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    align-self: flex-start;
}

.product-badge.budget {
    background: rgba(76,175,80,0.15);
    color: var(--budget);
    border: 1px solid var(--budget);
}

.product-badge.performance {
    background: rgba(255,152,0,0.15);
    color: var(--performance);
    border: 1px solid var(--performance);
}

.product-badge.enthusiast {
    background: rgba(244,67,54,0.15);
    color: var(--enthusiast);
    border: 1px solid var(--enthusiast);
}

.product-rating {
    color: #ffc107;
    font-size: 0.85rem;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.product-rating i {
    margin-right: 3px;
}

.add-to-build {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-size: 0.95rem;
    margin-top: auto;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.add-to-build:hover {
    background: var(--secondary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(26, 115, 232, 0.3);
}

.add-to-build:active {
    transform: translateY(0);
}

.build-sidebar {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 20px;
    box-shadow: var(--shadow);
    height: fit-content;
    position: sticky;
    top: 90px;
    max-height: calc(100vh - 100px);
    overflow-y: auto;
}

.fps-panel {
    background: linear-gradient(135deg, #141e30, #2c3e50);
    color: white;
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 20px;
}

.fps-panel h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
}

.fps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-top: 10px;
}

.fps-card {
    background: rgba(255,255,255,0.1);
    padding: 10px;
    border-radius: 8px;
    text-align: center;
    transition: var(--transition);
}

.fps-card:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.fps-card div:first-child {
    font-size: 0.85rem;
    margin-bottom: 5px;
    opacity: 0.9;
}

.fps-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: #4caf50;
}

.compatibility-panel {
    background: var(--card-bg);
    border-left: 5px solid var(--success);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.compatibility-panel h3 {
    margin-bottom: 10px;
    font-size: 1rem;
}

.compatibility-warning {
    border-left-color: var(--warning);
}

.compatibility-critical {
    border-left-color: var(--critical);
}

.warning-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    margin-bottom: 8px;
    font-size: 0.9rem;
    padding: 5px;
    border-radius: 5px;
    transition: var(--transition);
}

.warning-item:hover {
    background: var(--hover);
}

.warning-item i {
    color: var(--warning);
    font-size: 1rem;
}

.critical-item i {
    color: var(--critical);
}

.selected-parts {
    max-height: 400px;
    overflow-y: auto;
    margin-bottom: 20px;
}

.selected-item {
    display: flex;
    justify-content: space-between;
    padding: 10px;
    background: var(--meter-bg);
    border-radius: 8px;
    margin-bottom: 8px;
    border-left: 5px solid var(--primary);
    transition: var(--transition);
}

.selected-item:hover {
    transform: translateX(3px);
    background: var(--hover);
}

.total-cost {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 15px;
    border-radius: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    margin-top: 20px;
}

.total-price {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    z-index: 10000;
    justify-content: center;
    align-items: center;
    animation: fadeIn 0.3s ease;
}

.modal-content {
    background: var(--card-bg);
    border-radius: 20px;
    width: 90%;
    max-width: 800px;
    padding: 30px;
    box-shadow: var(--shadow);
    position: relative;
    animation: slideUp 0.3s ease;
}

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

.close-modal {
    position: absolute;
    right: 20px;
    top: 15px;
    font-size: 2rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.close-modal:hover {
    color: var(--accent);
    transform: scale(1.1);
}

.modal h2 {
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.brand-item {
    text-align: center;
    padding: 20px;
    background: var(--hover);
    border-radius: var(--border-radius);
    transition: var(--transition);
    cursor: pointer;
}

.brand-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
    background: var(--border);
}

.brand-item i {
    margin-bottom: 10px;
}

.brand-item h3 {
    font-size: 1rem;
    color: var(--text);
}

.service-center {
    padding: 20px;
}

.service-center h2 {
    margin-bottom: 30px;
}

.service-card {
    background: var(--hover);
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.service-card i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 15px;
}

.service-card h3 {
    margin-bottom: 10px;
}

.service-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

.rewards-center {
    padding: 20px;
}

.rewards-center h2 {
    margin-bottom: 30px;
}

.rewards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
}

.reward-card {
    background: var(--hover);
    padding: 25px;
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.reward-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.reward-points {
    position: absolute;
    top: 10px;
    right: 10px;
    background: var(--accent);
    color: white;
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.reward-card h3 {
    margin: 20px 0 10px;
    font-size: 1.2rem;
}

.reward-card p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.auth-modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    z-index: 9999;
    justify-content: center;
    align-items: center;
}

.auth-modal-content {
    background: var(--card-bg);
    border-radius: 15px;
    width: 450px;
    max-width: 90%;
    padding: 30px;
    box-shadow: var(--shadow);
}

.close-auth {
    float: right;
    font-size: 1.8rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.close-auth:hover {
    color: var(--accent);
}

.auth-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 25px;
}

.auth-tab {
    flex: 1;
    padding: 12px;
    border: none;
    background: var(--meter-bg);
    color: var(--text);
    border-radius: 8px;
    cursor: pointer;
    font-weight: 600;
    transition: var(--transition);
}

.auth-tab:hover {
    background: var(--border);
}

.auth-tab.active {
    background: var(--primary);
    color: white;
}

.auth-form {
    display: none;
}

.auth-form.active {
    display: block;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: var(--card-bg);
    color: var(--text);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26,115,232,0.1);
}

.auth-btn {
    width: 100%;
    padding: 14px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

.auth-btn:hover {
    background: var(--secondary);
    transform: translateY(-2px);
}

.auth-footer {
    text-align: center;
    margin-top: 20px;
    color: var(--text-secondary);
}

.switch-auth {
    background: none;
    border: none;
    color: var(--primary);
    cursor: pointer;
    text-decoration: underline;
    font-weight: 600;
    transition: var(--transition);
}

.switch-auth:hover {
    color: var(--accent);
}

.user-info {
    display: none;
    align-items: center;
    gap: 15px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: white;
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    transition: var(--transition);
}

.user-avatar:hover {
    transform: scale(1.1);
}

.user-menu {
    position: relative;
    display: inline-block;
    cursor: pointer;
}

.user-menu-content {
    display: none;
    position: absolute;
    right: 0;
    background: var(--card-bg);
    min-width: 200px;
    box-shadow: var(--shadow);
    border-radius: 8px;
    padding: 10px 0;
    z-index: 100;
    border: 1px solid var(--border);
    animation: slideDown 0.2s ease;
}

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

.user-menu-item {
    padding: 12px 20px;
    cursor: pointer;
    color: var(--text);
    transition: var(--transition);
}

.user-menu-item:hover {
    background: var(--hover);
    padding-left: 25px;
}

.dark-mode-toggle {
    background: rgba(255,255,255,0.2);
    border: 2px solid white;
    color: white;
    padding: 8px 16px;
    border-radius: 30px;
    cursor: pointer;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.dark-mode-toggle:hover {
    background: white;
    color: var(--primary);
    transform: translateY(-2px);
}

.btn {
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    justify-content: center;
    transition: var(--transition);
    font-size: 0.95rem;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.hidden {
    display: none;
}

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--meter-bg);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 4px;
    transition: var(--transition);
}

::-webkit-scrollbar-thumb:hover {
    background: #555;
}

@media (max-width: 1400px) {
    .main-layout {
        grid-template-columns: 250px 1fr 300px;
    }
}

@media (max-width: 1200px) {
    .main-layout {
        grid-template-columns: 1fr;
    }
    
    .category-sidebar,
    .build-sidebar {
        position: static;
        max-height: none;
    }
    
    .nav-menu {
        overflow-x: auto;
        flex-wrap: nowrap;
        -webkit-overflow-scrolling: touch;
    }
    
    .nav-item {
        white-space: nowrap;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: stretch;
    }
    
    .search-bar {
        max-width: none;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        width: 95%;
        padding: 20px;
    }
    
    .section-title {
        font-size: 1.3rem;
    }
    
    .logo h1 {
        font-size: 1.5rem;
    }
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--border);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spin 1s ease-in-out infinite;
}

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

[data-tooltip] {
    position: relative;
    cursor: help;
}

[data-tooltip]:before {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    padding: 5px 10px;
    background: var(--text);
    color: var(--card-bg);
    border-radius: 5px;
    font-size: 0.8rem;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    pointer-events: none;
}

[data-tooltip]:hover:before {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-5px);
}