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

:root {
    --primary-color: #0066cc;
    --secondary-color: #f0f4f8;
    --text-color: #333;
    --border-color: #ddd;
    --hover-color: #0052a3;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
}

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

/* Header & Navigation */
header {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-color);
}

.site-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
    text-decoration: none;
}

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

h1 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

h2 {
    font-size: 1.8rem;
    margin: 32px 0 16px;
}

.subtitle {
    font-size: 1.1rem;
    color: #666;
    margin-bottom: 32px;
}

/* Search Section */
.search-section {
    background: var(--secondary-color);
    padding: 32px;
    border-radius: 8px;
    margin-bottom: 32px;
}

.search-box {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}

.search-box input {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 16px;
}

.search-box button {
    padding: 12px 24px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

.search-box button:hover {
    background-color: var(--hover-color);
}

/* Calculator */
.calculator-section {
    margin-bottom: 48px;
}

.calculator {
    max-width: 400px;
    margin: 0 auto;
    padding: 24px;
    background: var(--secondary-color);
    border-radius: 8px;
}

#calcDisplay {
    width: 100%;
    padding: 12px;
    margin-bottom: 8px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 16px;
}

.calc-result {
    width: 100%;
    padding: 16px;
    margin-bottom: 16px;
    background: white;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 24px;
    font-weight: bold;
    text-align: right;
    min-height: 60px;
}

.calc-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
}

.calc-buttons button {
    padding: 16px;
    font-size: 18px;
    border: 1px solid var(--border-color);
    background: white;
    cursor: pointer;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.calc-buttons button:hover {
    background-color: #e8e8e8;
}

.clear-btn {
    grid-column: span 2;
    background-color: #ff6b6b !important;
    color: white !important;
}

.clear-btn:hover {
    background-color: #ee5a52 !important;
}

.equals-btn {
    grid-column: span 2;
    background-color: var(--primary-color) !important;
    color: white !important;
}

.equals-btn:hover {
    background-color: var(--hover-color) !important;
}

/* Language Grid */
.language-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.language-card {
    display: block;
    padding: 24px;
    background: var(--secondary-color);
    border: 2px solid transparent;
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s;
    text-align: center;
}

.language-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.flag {
    font-size: 48px;
    display: block;
    margin-bottom: 12px;
}

.language-card h3 {
    font-size: 1.3rem;
    margin-bottom: 4px;
}

.language-card p {
    color: #666;
    font-size: 0.9rem;
}

/* Categories */
.category-links {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 16px;
}

.category-link {
    padding: 12px 20px;
    background: var(--secondary-color);
    border-radius: 20px;
    text-decoration: none;
    color: var(--text-color);
    transition: background-color 0.3s;
}

.category-link:hover {
    background-color: #d9e2ec;
}

/* Footer */
footer {
    margin-top: 64px;
    padding: 32px 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

.footer-links a {
    color: #666;
    text-decoration: none;
}

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

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .language-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }

    .search-box {
        flex-direction: column;
    }

    .calc-buttons {
        grid-template-columns: repeat(4, 1fr);
    }
}