Css — /* style.css */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --text-primary: #1a1a1a;
    --text-secondary: #6c757d;
    --accent: #007bff;
    --card-bg: #ffffff;
    --border: #dee2e6;
}

[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #adb5bd;
    --accent: #4dabf7;
    --card-bg: #2d2d2d;
    --border: #495057;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: all 0.3s ease;
}

.navbar {
    background: var(--card-bg);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--accent);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--accent);
}

.theme-toggle button {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
}

.hero {
    text-align: center;
    padding: 5rem 2rem;
    background: linear-gradient(135deg, var(--accent), #0056b3);
    color: white;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.cta-btn {
    display: inline-block;
    background: #ff6b35;
    color: white;
    padding: 1rem 2rem;
    text-decoration: none;
    border-radius: 50px;
    font-weight: bold;
    margin-top: 2rem;
    transition: transform 0.3s;
}

.cta-btn:hover {
    transform: translateY(-2px);
}

.service-grid, .package-cards {
    max-width: 1200px;
    margin: 4rem auto;
    padding: 0 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.service-card, .package-card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border: 1px solid var(--border);
    transition: transform 0.3s, box-shadow 0.3s;
}

.service-card:hover, .package-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.package-card.popular {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(73, 171, 247, 0.3);
}

.buy-btn {
    width: 100%;
    background: var(--accent);
    color: white;
    border: none;
    padding: 1rem;
    border-radius: 10px;
    font-size: 1.1rem;
    cursor: pointer;
    margin-top: 1rem;
}

.buy-btn:hover {
    background: #0056b3;
}

/* Calculator page */
.calculator {
    max-width: 600px;
    margin: 4rem auto;
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: bold;
}

select, input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border);
    border-radius: 8px;
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 1rem;
}

.total-price {
    font-size: 2rem;
    font-weight: bold;
    text-align: center;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 15px;
    margin: 2rem 0;
}

/* Cart, profile, chat, etc. similar styling */
.chat-container {
    max-width: 800px;
    margin: 2rem auto;
    height: 500px;
    display: flex;
    flex-direction: column;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 10px;
    margin-bottom: 1rem;
}

.message {
    margin-bottom: 1rem;
    padding: 0.75rem;
    border-radius: 10px;
}

.message.admin {
    background: var(--accent);
    color: white;
}

.chat-input {
    display: flex;
    gap: 1rem;
}

.chat-input input {
    flex: 1;
}
@media (max-width: 768px) {
    .nav-menu {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero h1 {
        font-size: 2.5rem;
    }
}