:root {
    --primary: #60a5fa;
    --secondary: #a78bfa;
    --dark: #0f172a;
    --darker: #312e81;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --success: #10b981;
    --error: #ef4444;
    --transition: 0.3s ease;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: system-ui, -apple-system, sans-serif;
    min-height: 100vh;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--dark), var(--darker));
    padding: clamp(1rem, 5vw, 2rem);
}

.container {
    max-width: min(1200px, 90vw);
    margin: 0 auto;
}

.header {
    text-align: center;
    margin-bottom: 2rem;
}

.header h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.header p {
    color: var(--text-secondary);
    font-size: clamp(1rem, 2vw, 1.2rem);
}

.icon-badge {
    position: absolute;
    top: -15px;
    right: -15px;
    padding: 10px;
    border-radius: 50%;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    box-shadow: var(--shadow-sm);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-5px);
}

.tab-container {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.2);
}

.tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

.tab:hover {
    background: rgba(255, 255, 255, 0.05);
}

.tab.active {
    background: rgba(96, 165, 250, 0.2);
    color: var(--text-primary);
}

.mode-section {
    display: grid;
    gap: 1rem;
    padding: 1.5rem;
}

.input-section, .result-section {
    background: rgba(0, 0, 0, 0.2);
    border-radius: 12px;
    padding: 1.5rem;
}

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

.input-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.input-label i {
    color: var(--primary);
}

.input-wrapper {
    position: relative;
}

textarea {
    width: 100%;
    height: 150px;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    padding: 1rem;
    color: var(--text-primary);
    font-family: 'Monaco', 'Consolas', monospace;
    font-size: 0.9rem;
    resize: vertical;
    min-height: 100px;
    max-height: 300px;
    transition: var(--transition);
}

textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(96, 165, 250, 0.2);
}

.convert-btn {
    width: 100%;
    padding: 1rem;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border: none;
    border-radius: 10px;
    color: var(--text-primary);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.convert-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(96, 165, 250, 0.3);
}

.copy-btn {
    position: absolute;
    right: 10px;
    top: 10px;
    background: rgba(96, 165, 250, 0.2);
    border: none;
    border-radius: 6px;
    padding: 0.5rem;
    color: var(--primary);
    cursor: pointer;
    transition: var(--transition);
}

.copy-btn:hover {
    background: rgba(96, 165, 250, 0.3);
}

.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 1rem 1.5rem;
    background: var(--success);
    color: white;
    border-radius: 8px;
    transform: translateX(200%);
    transition: transform var(--transition);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-sm);
    z-index: 1000;
}

.notification.show {
    transform: translateX(0);
}

.notification.error {
    background: var(--error);
}

@media (max-width: 768px) {
    .tab-container {
        flex-direction: column;
    }

    .mode-section {
        padding: 1rem;
    }

    textarea {
        font-size: 0.8rem;
    }
}