:root {
    --background-color: #121212;
    --surface-color: #1e1e1e;
    --primary-text-color: #ffffff;
    --secondary-text-color: #b3b3b3;
    --accent-color: #00ff88;
    --hover-color: #00cc6a;
    --button-color: #2c2c2c;
    --button-hover-color: #3a3a3a;
    --transition: all 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
    line-height: 1.6;
    color: var(--primary-text-color);
    background-color: var(--background-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background-color: rgba(30, 30, 30, 0.95);
    backdrop-filter: blur(10px);
    position: fixed;
    width: 100%;
    z-index: 1000;
    padding: 20px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 20px rgba(0,0,0,0.2);
}

header h1 {
    color: var(--accent-color);
    font-size: 2em;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 700;
}

nav ul {
    list-style-type: none;
    display: flex;
}

nav ul li {
    margin-left: 25px;
}

nav ul li a {
    text-decoration: none;
    color: var(--secondary-text-color);
    font-weight: 600;
    transition: var(--transition);
    font-size: 1.05em;
    position: relative;
}

nav ul li a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition);
}

nav ul li a:hover::after, nav ul li a.active::after {
    width: 100%;
}

nav ul li a:hover, nav ul li a.active {
    color: var(--accent-color);
}

main {
    flex-grow: 1;
    padding: 120px 5% 80px;
}

h2 {
    font-size: 2.2em;
    color: var(--accent-color);
    margin-bottom: 40px;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 700;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 40px;
}

.product {
    background: var(--surface-color);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    transition: var(--transition);
}

.product:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 40px rgba(0,255,136,0.2);
}

.product img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: var(--transition);
}

.product:hover img {
    transform: scale(1.05);
}

.product-info {
    padding: 25px;
}

.product h3 {
    font-size: 1.2em;
    margin-bottom: 15px;
    color: var(--primary-text-color);
    font-weight: 600;
}

.product .price {
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 20px;
    font-size: 1.1em;
}

.product .description {
    font-size: 0.95em;
    color: var(--secondary-text-color);
    margin-bottom: 25px;
    line-height: 1.6;
}

.product button, #loginBtn, #logoutBtn, #createOrderBtn {
    display: inline-block;
    padding: 12px 20px;
    background-color: var(--button-color);
    color: var(--primary-text-color);
    border: none;
    border-radius: 8px;
    font-size: 0.95em;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.product button:hover, #loginBtn:hover, #logoutBtn:hover, #createOrderBtn:hover {
    background-color: var(--button-hover-color);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

#loginBtn, #logoutBtn {
    margin-left: 20px;
}

#createOrderBtn {
    margin-top: 30px;
    width: 100%;
}

footer {
    text-align: center;
    padding: 30px 5%;
    background-color: var(--surface-color);
    color: var(--secondary-text-color);
    font-size: 0.9em;
}

.error-message {
    color: #ff6b6b;
    text-align: center;
    font-size: 1.1em;
    margin-top: 25px;
    background: rgba(255,107,107,0.1);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid rgba(255,107,107,0.3);
}

#basketList {
    margin-bottom: 30px;
}

.basket-item {
    background: var(--surface-color);
    padding: 20px;
    margin-bottom: 15px;
    border-radius: 8px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

.basket-item:hover {
    transform: translateX(5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

#basketTotal {
    font-size: 1.3em;
    font-weight: 700;
    text-align: right;
    margin-bottom: 30px;
    color: var(--accent-color);
}

#orderList .order {
    background: var(--surface-color);
    padding: 25px;
    margin-bottom: 25px;
    border-radius: 8px;
    transition: var(--transition);
}

#orderList .order:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.2);
}

#orderList .order h3 {
    color: var(--accent-color);
    margin-bottom: 15px;
    font-size: 1.2em;
}

#orderDetails {
    background: var(--surface-color);
    padding: 30px;
    border-radius: 12px;
    margin-top: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

#orderDetails h3 {
    color: var(--accent-color);
    font-size: 1.5em;
    margin-bottom: 20px;
}

#orderDetails p {
    margin-bottom: 15px;
    font-size: 1.1em;
}

#orderDetails h4 {
    color: var(--accent-color);
    font-size: 1.3em;
    margin: 30px 0 20px;
}

#orderDetails ul {
    list-style-type: none;
    padding: 0;
}

#orderDetails li {
    background: rgba(255, 255, 255, 0.05);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#orderList, #orderDetails {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

#orderList.hidden, #orderDetails.hidden {
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
}

.basket-item button, #orderDetails button, #orderList .order button {
    background-color: var(--button-color);
    color: var(--primary-text-color);
    border: none;
    padding: 10px 15px;
    border-radius: 5px;
    cursor: pointer;
    transition: var(--transition);
    font-weight: 600;
    text-transform: uppercase;
}

.basket-item button:hover, #orderDetails button:hover, #orderList .order button:hover {
    background-color: var(--button-hover-color);
    transform: translateY(-2px);
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 15px 20px;
    border-radius: 5px;
    color: white;
    font-weight: bold;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: 1001;
}

.notification.show {
    opacity: 1;
}

.notification.success {
    background-color: #4CAF50;
}

.notification.error {
    background-color: #f44336;
}

.notification.warning {
    background-color: #ff9800;
}

@media (max-width: 768px) {
    header {
        flex-wrap: wrap;
        padding: 15px 5%;
    }

    nav {
        width: 100%;
        margin-top: 20px;
    }

    nav ul {
        justify-content: space-between;
    }

    nav ul li {
        margin-left: 0;
    }

    .product-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    }

    #orderDetails {
        padding: 20px;
    }

    #orderDetails h3 {
        font-size: 1.3em;
    }

    #orderDetails p, #orderDetails li {
        font-size: 1em;
    }
}