:root {
    --bg: #0f172a;
    --panel: #111827;
    --text: #e5e7eb;
    --muted: #9ca3af;
    --accent: #36c;
    --accent-2: #2563eb;
    --ring: #60a5fa33;
    --radius: 12px;
    --gap: 14px;
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    margin: 0;
    font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    color: var(--text);
    background: radial-gradient(1200px 1200px at 10% 10%, #0b1024 0%, #060913 35%, #03050b 55%, #02040a 100%), var(--bg);
    line-height: 1.5;
}
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 24px;
}
header {
    margin-bottom: 20px;
}
.title {
    font-size: clamp(1.5rem, 2vw + 1rem, 2.2rem);
    font-weight: 700;
    letter-spacing: 0.2px;
    margin: 0 0 6px 0;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(90deg, #dbeafe, #93c5fd 40%, #60a5fa 70%, #93c5fd 100%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.subtitle {
    color: var(--muted);
    margin: 0;
    font-size: 0.95rem;
}

.grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--gap);
}
@media (min-width: 720px) {
    .grid-2 {
    grid-template-columns: repeat(2, 1fr);
    }
}

.card {
    background: linear-gradient(180deg, #0d1226, #0a0f21);
    border: 1px solid #1f2937;
    border-radius: var(--radius);
    padding: 18px;
    box-shadow: 0 8px 30px rgba(2,6,23,0.35), inset 0 1px 0 rgba(255,255,255,0.03);
}
.card h2 {
    margin: 0 0 12px 0;
    font-size: 1.1rem;
    letter-spacing: 0.3px;
    color: #dbeafe;
}

.field {
    display: grid;
    gap: 6px;
}
.label {
    font-size: 0.9rem;
    color: #cbd5e1;
}
.control {
    display: flex;
    align-items: center;
    gap: 8px;
    background: #0b1024;
    border: 1px solid #1f2937;
    border-radius: 10px;
    padding: 10px 12px;
    transition: border-color .2s, box-shadow .2s;
}
.control:focus-within {
    border-color: #3b82f6;
    box-shadow: 0 0 0 4px var(--ring);
}
.prefix, .suffix {
    color: #9fb3d2;
    font-variant-numeric: tabular-nums;
    font-size: 0.95rem;
    user-select: none;
}
input[type="number"], select {
    width: 100%;
    background: transparent;
    border: 0;
    color: var(--text);
    outline: none;
    font-size: 1rem;
    padding: 0;
    min-height: 26px;
    appearance: textfield;
}
input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 6px;
}
.btn {
    appearance: none;
    border: 1px solid #1f2937;
    color: #e5e7eb;
    background: linear-gradient(180deg, #0d162e, #0a1226);
    padding: 10px 14px;
    border-radius: 10px;
    font-weight: 600;
    letter-spacing: .2px;
    cursor: pointer;
    transition: transform .06s ease, border-color .2s, background .2s;
}
.btn:hover { transform: translateY(-1px); border-color: #334155; }
.btn:active { transform: translateY(0); }
.btn-primary {
    background: linear-gradient(180deg, #2563eb, #1e40af);
    border-color: #1e3a8a;
    box-shadow: 0 10px 24px rgba(30,64,175,0.35);
}
.btn-primary:hover { background: linear-gradient(180deg, #1d4ed8, #1e40af); }

.result {
    display: grid;
    gap: 10px;
}
.kpi {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 8px;
    align-items: center;
    background: #0b1024;
    border: 1px solid #1f2937;
    border-radius: 10px;
    padding: 12px;
}
.kpi .name { color: #9fb3d2; font-size: 0.9rem; }
.kpi .value { font-weight: 700; letter-spacing: .3px; }