:root {
    --primary: #2C3E50;
    --accent: #3498DB;
    --warm: #f2849e;
    --success: #27AE60;
    --secondary: #ECF0F1;
    --text: #333333;
    --text-light: #585858;
    --border: #e0e0e0;
    --white: #ffffff;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-warm: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text);
    line-height: 1.6;
    font-size: 16px;
}

h1, h2, h3, .logo {
    font-family: 'Playfair Display', serif;
}

h1 {
    font-size: 2.5rem;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h2 {
    font-size: 2rem;
    line-height: 1.3;
    margin-bottom: 1rem;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

h4 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

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

.site-header {
    background: var(--white);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(255, 255, 255, 0.95);
}

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

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

.logo {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

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

.nav-menu a {
    color: var(--text);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--primary);
    transition: all 0.3s ease;
}

.btn-primary,
.btn-secondary,
.btn-primary-small {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary-small {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.btn-icon {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--secondary);
    color: var(--primary);
    transition: all 0.3s ease;
}

.btn-icon:hover {
    background: var(--accent);
    color: var(--white);
    transform: scale(1.05);
}

.cart-badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--warm);
    color: var(--white);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.2rem 0.4rem;
    border-radius: 10px;
    min-width: 20px;
    text-align: center;
    line-height: 1;
}

.btn-primary {
    background: var(--accent);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
}

.btn-secondary:hover {
    background: var(--accent);
    color: var(--white);
}

.hero {
    background: var(--gradient-primary);
    color: var(--white);
    padding: 5rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--white);
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.section {
    padding: 4rem 0;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary);
}

.grid-2,
.grid-3,
.grid-4 {
    display: grid;
    gap: 2rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 2rem;
    transition: all 0.3s ease;
}

.card:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    transform: translateY(-4px);
}

.card h3 {
    color: var(--primary);
    margin-bottom: 1rem;
}

.price-card {
    background: var(--white);
    border: 2px solid var(--border);
    border-radius: 8px;
    padding: 2rem;
    text-align: center;
    transition: all 0.3s ease;
}

.price-card:hover {
    border-color: var(--accent);
    box-shadow: 0 8px 24px rgba(52, 152, 219, 0.2);
}

.price-card.featured {
    border-color: var(--warm);
    background: linear-gradient(to bottom, rgba(242, 132, 158, 0.05), var(--white));
}

.price-card .size {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.price-card .paper-type {
    color: var(--text-light);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.price-table {
    margin: 1.5rem 0;
}

.price-row {
    display: flex;
    justify-content: space-between;
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--secondary);
}

.price-row:last-child {
    border-bottom: none;
}

.price-row .quantity {
    font-weight: 600;
    color: var(--text-light);
}

.price-row .price {
    font-weight: 700;
    color: var(--accent);
}

.badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.badge-standard {
    background: #e3f2fd;
    color: #1976d2;
}

.badge-pro {
    background: #f3e5f5;
    color: #7b1fa2;
}

.badge-premium {
    background: #fff3e0;
    color: #e65100;
}

.badge-fineart {
    background: #fce4ec;
    color: #c2185b;
}

.paper-guide {
    background: var(--secondary);
    border-left: 4px solid var(--accent);
    padding: 1.5rem;
    border-radius: 4px;
    margin: 2rem 0;
}

.calculator {
    background: var(--white);
    border: 2px solid var(--accent);
    border-radius: 8px;
    padding: 2rem;
    margin: 2rem 0;
}

.calculator h3 {
    margin-bottom: 1.5rem;
}

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

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

.form-group select,
.form-group input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 1rem;
    font-family: 'Inter', sans-serif;
}

.form-group select:focus,
.form-group input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.calculator-result {
    background: var(--gradient-primary);
    color: var(--white);
    padding: 1.5rem;
    border-radius: 6px;
    text-align: center;
    margin-top: 1.5rem;
}

.calculator-result .total {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.calculator-result .note {
    font-size: 0.9rem;
    opacity: 0.9;
}

.warning {
    background: #fff3cd;
    border-left: 4px solid #ffc107;
    padding: 1rem 1.5rem;
    border-radius: 4px;
    color: #856404;
}

.success-box {
    background: #d4edda;
    border-left: 4px solid var(--success);
    padding: 1rem 1.5rem;
    border-radius: 4px;
    color: #155724;
}

.table-responsive {
    overflow-x: auto;
    margin: 2rem 0;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
}

thead {
    background: var(--primary);
    color: var(--white);
}

th,
td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    font-weight: 600;
}

tbody tr:hover {
    background: var(--secondary);
}

.faq-item {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 1.5rem;
    margin-bottom: 1rem;
}

.faq-item h3 {
    color: var(--primary);
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
}

.site-footer {
    background: var(--primary);
    color: var(--white);
    padding: 3rem 0 1rem;
    margin-top: 4rem;
}

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

.footer-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--white);
}

.footer-heading {
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-text {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.5rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    transition: color 0.3s ease;
}

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

.footer-col .btn-primary,
.footer-col .btn-secondary {
    display: block;
    margin-top: 1rem;
}

.footer-col .btn-secondary {
    background: transparent;
    border-color: rgba(255, 255, 255, 0.5);
    color: var(--white);
}

.footer-col .btn-secondary:hover {
    border-color: var(--white);
    background: rgba(255, 255, 255, 0.1);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        gap: 0;
        padding: 1rem;
        box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    }

    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-menu a {
        display: block;
        padding: 0.75rem;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .section {
        padding: 2rem 0;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero {
        padding: 3rem 0;
    }

    .card,
    .price-card {
        padding: 1.5rem;
    }

    .btn-primary,
    .btn-secondary {
        padding: 0.625rem 1.25rem;
        font-size: 0.9rem;
    }
}