:root {
    --bg: #020617;
    --card-bg: #0f172a;
    --accent: #6366f1;
    --green: #22c55e;
    --text: #f1f5f9;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg);
    background-image: radial-gradient(circle at top center, #1e1b4b 0%, #020617 100%);
    color: var(--text);
    margin: 0; padding: 40px 20px;
    display: flex; justify-content: center;
}

.container {
    width: 100%; max-width: 1000px;
}

header { text-align: center; margin-bottom: 40px; }
h1 { font-size: 2.5rem; color: var(--accent); margin: 0; text-transform: uppercase; letter-spacing: 2px; }
header p { color: #94a3b8; margin-top: 10px; }

.main-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 20px; margin-bottom: 30px;
}

.card {
    background: var(--card-bg);
    padding: 25px; border-radius: 20px;
    border: 1px solid rgba(255,255,255,0.05);
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

.card h3 { font-size: 1rem; margin-top: 0; color: var(--accent); display: flex; align-items: center; gap: 10px; border-bottom: 1px solid #1e293b; padding-bottom: 15px; }

.input-group { display: flex; flex-direction: column; gap: 12px; margin-top: 15px; }
label { font-size: 0.75rem; color: #64748b; font-weight: bold; text-transform: uppercase; }

select {
    padding: 12px; background: #1e293b; border: 1px solid #334155;
    color: white; border-radius: 10px; outline: none; cursor: pointer; transition: 0.3s;
}

select:focus { border-color: var(--accent); }

.actions { display: flex; gap: 15px; margin-top: 20px; }
button {
    flex: 1; padding: 18px; border-radius: 15px; border: none;
    font-weight: 800; cursor: pointer; transition: 0.3s;
    display: flex; align-items: center; justify-content: center; gap: 10px;
    text-transform: uppercase;
}

.btn-main { background: var(--accent); color: white; }
.btn-sub { background: var(--green); color: #052e16; }
button:hover { transform: translateY(-3px); filter: brightness(1.2); }

.output-box { margin-top: 30px; }
textarea {
    width: 100%; height: 350px; background: rgba(0,0,0,0.5); color: var(--green);
    border-radius: 20px; border: 1px solid #1e293b; padding: 25px;
    font-family: 'Consolas', monospace; font-size: 14px; resize: none; outline: none;
}