:root {
    --bg: #0b1723;
    --card: #0f2536;
    --text: #e8f1f8;
    --muted: #7da0c3;
    --accent: #f5a524;
    --accent-2: #3dd6b7;
    --border: #1f3a50;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.25);
    --font: "Space Grotesk", "Fira Sans", "Segoe UI", sans-serif;
    --mono: "JetBrains Mono", "Fira Code", monospace;
}

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;600&family=JetBrains+Mono:wght@400;600&display=swap');

* { box-sizing: border-box; }
body {
    margin: 0;
    padding: 0;
    background: radial-gradient(circle at 20% 20%, rgba(61, 214, 183, 0.08), transparent 25%),
                radial-gradient(circle at 80% 0%, rgba(245, 165, 36, 0.1), transparent 30%),
                linear-gradient(135deg, #0a1521, #0c1c2b 40%, #0a1521);
    color: var(--text);
    font-family: var(--font);
    min-height: 100vh;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 28px;
    position: sticky;
    top: 0;
    background: rgba(11, 23, 35, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 5;
}

.logo { font-weight: 700; letter-spacing: 0.8px; color: var(--accent); }
nav a {
    color: var(--muted);
    text-decoration: none;
    margin-left: 18px;
    padding: 8px 12px;
    border-radius: 10px;
    transition: background 0.2s ease, color 0.2s ease;
    font-weight: 600;
}
nav a:hover { color: var(--text); background: rgba(255,255,255,0.05); }
nav a.active { color: #0b1723; background: var(--accent); }

main { padding: 28px; max-width: 1100px; margin: 0 auto; }
.hero {
    background: linear-gradient(120deg, rgba(61,214,183,0.12), rgba(245,165,36,0.12));
    border: 1px solid var(--border);
    padding: 28px;
    border-radius: 18px;
    box-shadow: var(--shadow);
}
.hero h1 { margin-top: 0; }
.hero .cta { margin-top: 18px; display: flex; gap: 12px; flex-wrap: wrap; }

.btn {
    background: var(--accent);
    color: #0b1723;
    padding: 10px 18px;
    border-radius: 12px;
    font-weight: 700;
    text-decoration: none;
    border: none;
}
.btn.ghost { background: transparent; color: var(--accent); border: 1px solid var(--accent); }
.btn:hover { filter: brightness(1.08); cursor: pointer; }

.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; margin-top: 18px; }
.card {
    background: var(--card);
    border: 1px solid var(--border);
    padding: 20px;
    border-radius: 14px;
    box-shadow: var(--shadow);
    margin-bottom: 18px;
}

.form-inline { display: grid; grid-template-columns: 1fr 1fr auto; gap: 12px; align-items: end; }
label { color: var(--muted); font-size: 0.95rem; display: flex; flex-direction: column; gap: 6px; }
input[type="text"] {
    padding: 10px;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: #0a1b2c;
    color: var(--text);
    font-family: var(--mono);
}
button {
    padding: 11px 16px;
    border-radius: 10px;
    border: none;
    background: var(--accent-2);
    color: #0b1723;
    font-weight: 700;
}
button:hover { filter: brightness(1.05); cursor: pointer; }

.note-list { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 8px; }
.pill {
    background: rgba(255,255,255,0.05);
    border: 1px dashed var(--border);
    padding: 6px 10px;
    border-radius: 10px;
    color: var(--muted);
    font-family: var(--mono);
    font-size: 0.9rem;
}

.output {
    background: #09131f;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 14px;
    font-family: var(--mono);
    white-space: pre-wrap;
    color: #d8f1ff;
}

.alert {
    background: rgba(255, 86, 86, 0.08);
    border: 1px solid rgba(255, 86, 86, 0.3);
    color: #ffb3b3;
    padding: 10px 12px;
    border-radius: 10px;
}

.muted { color: var(--muted); }
ul { padding-left: 20px; }

footer {
    padding: 16px 28px 24px;
    color: var(--muted);
    text-align: center;
}

@media (max-width: 700px) {
    .form-inline { grid-template-columns: 1fr; }
    nav a { margin-left: 8px; }
    header { flex-wrap: wrap; gap: 10px; }
}