@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-gradient: linear-gradient(135deg, #0f0c29 0%, #302b63 50%, #24243e 100%);
    --card-bg: rgba(255, 255, 255, 0.05);
    --card-border: rgba(255, 255, 255, 0.1);
    --text-primary: #ffffff;
    --text-secondary: #b8b9c9;
    --accent-purple: #667eea;

    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --transition: 0.3s ease;
    --font-size-2xl: 1.5rem;
    --transition-base: 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    scrollbar-width: thin;
    scrollbar-color: #667eea #0f0c29;
}

body::-webkit-scrollbar,
html::-webkit-scrollbar {
    display: block !important;
    width: 8px;
}

body::-webkit-scrollbar-track,
html::-webkit-scrollbar-track {
    background: #0f0c29;
}

body::-webkit-scrollbar-thumb,
html::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 4px;
}

body::-webkit-scrollbar-thumb:hover,
html::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #764ba2 0%, #667eea 100%);
}

.nav-container {
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--card-border);
    background: rgba(15, 12, 41, 0.8);
    backdrop-filter: blur(10px);
}

nav {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
}

.language-selector {
    justify-self: start;
    display: flex;
    align-items: center;
    gap: 8px;
    background: rgba(255, 255, 255, 0.05);
    padding: 4px 12px;
    border-radius: 20px;
    border: 1px solid var(--card-border);
}

.logo {
    justify-self: center;
    font-size: var(--font-size-2xl);
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    cursor: pointer;
    transition: var(--transition-base);
}

.logo:hover {
    transform: scale(1.25);
}

.back-link {
    justify-self: end;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--text-primary);
}

main.container {
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
    flex: 1;
    width: 100%;
}

.header-section {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.icon-wrapper {
    display: inline-flex;
    background: rgba(255, 255, 255, 0.1);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-md);
    box-shadow: 0 0 20px rgba(102, 126, 234, 0.3);
}

.header-icon {
    font-size: 2rem;
}

h1 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, #fff 0%, #b8b9c9 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-section p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.tool-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
}

.input-group,
.output-group {
    margin-bottom: var(--spacing-lg);
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-weight: 600;
}

.lang-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    padding: 2px 4px;
    transition: var(--transition);
}

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

.lang-btn.active {
    color: var(--accent-purple);
    text-shadow: 0 0 10px rgba(102, 126, 234, 0.4);
}

.lang-divider {
    color: var(--card-border);
    font-size: 0.8rem;
}

textarea {
    width: 100%;
    height: 120px;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    color: var(--text-primary);
    font-family: 'Inter', monospace;
    font-size: 1rem;
    resize: vertical;
    transition: var(--transition);
}

textarea:focus {
    outline: none;
    border-color: var(--accent-purple);
    box-shadow: 0 0 0 2px rgba(102, 126, 234, 0.2);
}

.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.btn {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    cursor: pointer;
    border: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: var(--transition);
    font-size: 1rem;
    flex: 1;
    justify-content: center;
}

.primary-btn {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.6);
}

.secondary-btn {
    background: #6a3093;
    background: linear-gradient(135deg, #8e2de2, #4a00e0);
    color: white;
    box-shadow: 0 4px 15px rgba(142, 45, 226, 0.4);
}

.secondary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(142, 45, 226, 0.6);
}

.text-btn {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    flex: 0 0 auto;
}

.text-btn:hover {
    background: rgba(255, 255, 255, 0.15);
    color: var(--text-primary);
}

.label-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.label-wrapper label {
    margin-bottom: 0;
}

.copy-btn {
    background: none;
    border: none;
    color: var(--accent-purple);
    cursor: pointer;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: var(--transition);
}

.copy-btn:hover {
    color: white;
}

.info-card {
    margin-top: var(--spacing-xl);
    background: rgba(102, 126, 234, 0.05);
    border-left: 4px solid var(--accent-purple);
    padding: var(--spacing-lg);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.info-card h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.info-card ul {
    padding-left: var(--spacing-lg);
    color: var(--text-secondary);
}

.info-card li {
    margin-bottom: var(--spacing-sm);
}

footer {
    text-align: center;
    padding: var(--spacing-lg);
    color: var(--text-secondary);
    border-top: 1px solid var(--card-border);
    margin-top: auto;
}

@media (max-width: 600px) {
    h1 {
        font-size: 2rem;
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}