/* Reset và base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f9f9f9;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header styles */
header {
    background-color: #fff;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 50px;
}

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

.main-nav li {
    margin-left: 20px;
}

.main-nav a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    padding: 8px 12px;
    border-radius: 4px;
    transition: all 0.3s;
}

.main-nav a:hover {
    background-color: #f5f5f5;
    color: #F26522;
}

.main-nav a.active {
    background-color: #F26522;
    color: white;
}

.language-switcher button {
    background-color: #F26522;
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    font-weight: 500;
    transition: background-color 0.3s;
}

.language-switcher button:hover {
    background-color: #e55511;
}

/* Main content styles */
main {
    padding: 40px 0;
}

.page-title {
    text-align: center;
    color: #0A3161;
    margin-bottom: 30px;
    font-size: 28px;
}

.calculator-container {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    max-width: 800px;
    margin: 0 auto 40px;
}

.calculator-form {
    padding: 30px;
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #0A3161;
}

.form-group select,
.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
}

.form-group select:focus,
.form-group input:focus {
    outline: none;
    border-color: #F26522;
}

.dimensions-group .dimensions-inputs {
    display: flex;
    gap: 15px;
}

.dimension-input {
    flex: 1;
    position: relative;
}

.dimension-input input {
    width: 100%;
    padding-right: 40px;
}

.dimension-input span {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: #777;
    font-size: 14px;
}

#calculate-btn {
    background-color: #F26522;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.3s;
}

#calculate-btn:hover {
    background-color: #e55511;
}

/* Result container styles */
.result-container {
    padding: 30px;
    border-top: 1px solid #eee;
    background-color: #f9f9f9;
}

.result-container h2 {
    color: #0A3161;
    margin-bottom: 20px;
    font-size: 22px;
}

.result-content {
    background-color: #fff;
    border-radius: 6px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.result-item {
    display: flex;
    margin-bottom: 12px;
    padding-bottom: 12px;
    border-bottom: 1px solid #eee;
}

.result-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.result-label {
    flex: 1;
    font-weight: 500;
    color: #555;
}

.result-value {
    flex: 2;
    font-weight: 700;
    color: #0A3161;
}

/* Price table styles */
.price-table-container {
    padding: 30px;
    border-top: 1px solid #eee;
    background-color: #f9f9f9;
}

.price-table-container h2 {
    color: #0A3161;
    margin-bottom: 20px;
    font-size: 22px;
}

.table-responsive {
    overflow-x: auto;
}

#price-table {
    width: 100%;
    border-collapse: collapse;
    background-color: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    border-radius: 6px;
    overflow: hidden;
}

#price-table th,
#price-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
}

#price-table th {
    background-color: #0A3161;
    color: white;
    font-weight: 500;
}

#price-table tbody tr:hover {
    background-color: #f5f5f5;
}

#price-table tbody tr:last-child td {
    border-bottom: none;
}

/* Shipping Policy styles */
.shipping-policy {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    max-width: 800px;
    margin: 0 auto;
    padding: 30px;
}

.shipping-policy h2 {
    color: #0A3161;
    margin-bottom: 20px;
    font-size: 24px;
    text-align: center;
}

.policy-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.policy-item {
    background-color: #f9f9f9;
    border-radius: 6px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.policy-item h3 {
    color: #F26522;
    margin-bottom: 10px;
    font-size: 18px;
}

.policy-item p {
    color: #555;
    font-size: 14px;
}

/* Footer styles */
footer {
    background-color: #0A3161;
    color: #fff;
    padding: 40px 0 20px;
    margin-top: 40px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-section h3 {
    color: #F26522;
    margin-bottom: 15px;
    font-size: 18px;
}

.footer-section p {
    margin-bottom: 10px;
    font-size: 14px;
    color: #ddd;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: #ddd;
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section ul li a:hover {
    color: #F26522;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 14px;
    color: #aaa;
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(255, 255, 255, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid #f3f3f3;
    border-top: 5px solid #F26522;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 15px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Utility classes */
.hidden {
    display: none;
}

/* Responsive styles */
@media (max-width: 768px) {
    header .container {
        flex-direction: column;
        align-items: center;
    }
    
    .logo {
        margin-bottom: 15px;
    }
    
    .main-nav {
        margin-bottom: 15px;
    }
    
    .main-nav ul {
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .main-nav li {
        margin: 5px;
    }
    
    .page-title {
        font-size: 24px;
    }
    
    .calculator-form {
        padding: 20px;
    }
    
    .dimensions-group .dimensions-inputs {
        flex-direction: column;
        gap: 10px;
    }
    
    .result-container,
    .price-table-container {
        padding: 20px;
    }
    
    .result-item {
        flex-direction: column;
    }
    
    .result-label {
        margin-bottom: 5px;
    }
    
    .policy-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .logo img {
        height: 40px;
    }
    
    .page-title {
        font-size: 20px;
    }
}