:root {
    --primary: #6366f1;
    --primary-hover: #818cf8;
    --bg: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border: #334155;
    --shadow: 0 20px 25px -5px rgb(0 0 0 / 0.3), 0 8px 10px -6px rgb(0 0 0 / 0.3);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg);
    color: var(--text-main);
    margin: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 20px;
}

.container {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 1.25rem;
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 450px;
    text-align: center;
    border: 1px solid var(--border);
}

h1 {
    margin: 0 0 0.5rem 0;
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.025em;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    font-size: 0.9375rem;
}

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

#textInp {
    width: 100%;
    padding: 0.875rem 1.125rem;
    background-color: #0f172a;
    border: 2px solid var(--border);
    border-radius: 0.75rem;
    font-size: 1rem;
    color: var(--text-main);
    transition: all 0.2s;
    outline: none;
    box-sizing: border-box;
}

#textInp:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

.button-group {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

input[type="submit"], #copyBtn {
    flex: 1;
    padding: 0.875rem 1.25rem;
    border-radius: 0.75rem;
    border: none;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 0.875rem;
}

input[type="submit"] {
    background-color: var(--primary);
    color: white;
}

input[type="submit"]:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
}

#copyBtn {
    background-color: #334155;
    color: #f1f5f9;
}

#copyBtn:hover {
    background-color: #475569;
    color: #ffffff;
}

.output-area {
    min-height: 3.5rem;
    padding: 1.25rem;
    background: #0f172a;
    border: 1px dashed var(--border);
    border-radius: 0.75rem;
    word-break: break-all;
    font-family: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
    font-size: 1.125rem;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #e2e8f0;
}

.output-area:empty::before {
    content: "Result will appear here...";
    color: var(--text-muted);
    font-family: 'Inter', sans-serif;
    font-style: italic;
    font-size: 0.875rem;
}