:root {
    --primary: #0066cc;
    --primary-hover: #0052a3;
    --background: #0a0a0a;
    --foreground: #ffffff;
    --card: #141414;
    --border: #262626;
    --muted: #1a1a1a;
    --muted-foreground: #a3a3a3;
    --success: #22c55e;
    --warning: #f59e0b;
    --radius: 8px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--background);
    color: var(--foreground);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

body.dark {
    background-color: var(--background);
    color: var(--foreground);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ============================================
   HEADER & LOGO
   ============================================ */
.header {
    background-color: rgba(10, 10, 10, 0.8);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    cursor: pointer;
}

.logo-img {
    height: 40px;
    width: auto;
    border-radius: 4px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--foreground);
    margin: 0;
}

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

.user-welcome {
    font-size: 0.9rem;
    color: var(--muted-foreground);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.625rem 1rem;
    border-radius: var(--radius);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    border: 1px solid transparent;
    text-decoration: none;
    gap: 0.4rem;
}

.btn-primary {
    background-color: var(--primary);
    color: white;
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 0 20px rgba(0, 102, 204, 0.6);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--border);
    color: var(--foreground);
}

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

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

.btn-full {
    width: 100%;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.buy-btn {
    position: relative;
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.buy-btn:active {
    transform: scale(0.98);
}

/* ============================================
   MAIN CONTENT & STORE
   ============================================ */
.main-content {
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

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

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

.store-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--foreground);
}

.store-subtitle {
    font-size: 1.1rem;
    color: var(--muted-foreground);
    max-width: 600px;
    margin: 0 auto;
}

/* Features Bar */
.features-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
    padding: 1rem;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--foreground);
}

.feature-icon {
    color: var(--success);
    font-size: 1.25rem;
}

/* Products Grid */
.products-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
}

@media (min-width: 640px) {
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .products-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 2rem;
    }
}

.product-card {
    background-color: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    display: flex;
    flex-direction: column;
}

.product-card:hover {
    border-color: var(--primary);
    transform: translateY(-8px);
    box-shadow: 0 25px 50px -5px rgba(0, 102, 204, 0.3);
}

.product-card:hover .product-name {
    color: var(--primary);
}

.product-card.featured {
    border: 2px solid var(--primary);
    transform: scale(1.05);
}

.badge-featured {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background-color: var(--primary);
    color: white;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    font-size: 0.7rem;
    font-weight: 700;
    z-index: 10;
}

.product-image {
    width: 100%;
    height: 150px;
    overflow: hidden;
    background-color: var(--muted);
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 4px;
}

.product-info {
    padding: 1rem;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.product-name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--foreground);
}

.product-price {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--primary);
}

/* ============================================
   FORMS
   ============================================ */
.form-card {
    background-color: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    max-width: 400px;
    margin: 0 auto;
    width: 100%;
    box-shadow: var(--shadow-lg);
}

.form-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    text-align: center;
}

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--foreground);
}

.form-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    background-color: var(--muted);
    color: var(--foreground);
    font-size: 0.875rem;
    transition: all 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-hint {
    font-size: 0.75rem;
    color: var(--muted-foreground);
    margin-top: 0.25rem;
}

.form-footer {
    text-align: center;
    margin-top: 1.5rem;
    font-size: 0.875rem;
}

.form-footer p {
    color: var(--muted-foreground);
}

.link-primary {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.link-primary:hover {
    text-decoration: underline;
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    padding: 1rem 1.5rem;
    background-color: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--foreground);
    font-size: 0.875rem;
    font-weight: 500;
    z-index: 1000;
    animation: slideIn 0.3s ease;
    max-width: 300px;
}

.toast.hidden {
    display: none;
}

.toast.success {
    border-color: var(--success);
    background-color: rgba(34, 197, 94, 0.1);
    color: var(--success);
}

.toast.error {
    border-color: #ef4444;
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background-color: var(--card);
    border-top: 1px solid var(--border);
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-col h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--foreground);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a {
    color: var(--muted-foreground);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    font-size: 0.75rem;
    color: var(--muted-foreground);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */
@media (max-width: 640px) {
    .store-title {
        font-size: 1.5rem;
    }

    .store-subtitle {
        font-size: 0.95rem;
    }

    .form-card {
        padding: 1.5rem;
    }

    .header-user {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-end;
    }

    .toast {
        bottom: 1rem;
        right: 1rem;
        left: 1rem;
        max-width: none;
    }
}