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

:root {
    --bg-color: #f5f5f5;
    --container-bg: white;
    --text-color: #333;
    --input-border: #ddd;
    --btn-primary: #4CAF50;
    --btn-primary-hover: #45a049;
    --btn-secondary: #2196F3;
    --btn-secondary-hover: #1976D2;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --container-bg: #2d2d2d;
    --text-color: #ffffff;
    --input-border: #404040;
    --btn-primary: #5db761;
    --btn-primary-hover: #4c9850;
    --btn-secondary: #2196F3;
    --btn-secondary-hover: #1976D2;
    --shadow-color: rgba(0, 0, 0, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    background-color: var(--container-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 6px var(--shadow-color);
    width: 90%;
    max-width: 500px;
}

h1 {
    text-align: center;
    color: var(--text-color);
    margin-bottom: 2rem;
    font-size: 1.8rem;
}

.input-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.input-field {
    flex: 1;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
}

input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    font-size: 1rem;
    background-color: var(--container-bg);
    color: var(--text-color);
}

.btn {
    width: 100%;
    padding: 1rem;
    background-color: var(--btn-primary);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.2s;
}

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

.result-container {
    margin-top: 1.5rem;
    text-align: center;
}

.result {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--text-color);
    margin: 1rem 0;
}

.copy-btn {
    background-color: var(--btn-secondary);
}

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

.theme-switcher, .lang-switcher {
    position: fixed;
    padding: 1rem;
}

.theme-switcher {
    top: 0;
    right: 0;
}

.lang-switcher {
    top: 0;
    left: 0;
}

.theme-btn, .lang-btn {
    background: var(--container-bg);
    border: 2px solid var(--text-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s;
}

.theme-btn:hover, .lang-btn:hover {
    transform: scale(1.05);
}

.dark-icon {
    display: none;
}

[data-theme="dark"] .light-icon {
    display: none;
}

[data-theme="dark"] .dark-icon {
    display: inline;
}

@media (max-width: 480px) {
    .input-group {
        flex-direction: column;
    }
    
    .container {
        padding: 1.5rem;
    }
    
    h1 {
        font-size: 1.5rem;
    }
}