:root { color-scheme: dark; font-family: Inter, system-ui, sans-serif; background: #09131f; color: #e7eef7; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: radial-gradient(circle at top right, #12324a, #09131f 55%); }
.shell { width: min(1100px, 94vw); margin: 0 auto; padding: 48px 0 28px; }
.eyebrow { color: #54d6a2; font-size: .75rem; letter-spacing: .14em; font-weight: 700; }
h1 { margin: 10px 0 8px; font-size: clamp(2rem, 5vw, 3.7rem); }
header p { color: #9fb0c3; max-width: 620px; }
.grid { display: grid; grid-template-columns: minmax(260px, .8fr) minmax(340px, 1.2fr); gap: 18px; margin-top: 30px; }
.card { border: 1px solid #21394d; border-radius: 16px; background: rgba(12, 29, 44, .88); padding: 22px; box-shadow: 0 20px 60px #0003; }
h2 { margin: 0 0 18px; font-size: 1.05rem; }
label { display: block; color: #aebfd0; font-size: .82rem; margin: 16px 0; }
input, select, button { width: 100%; margin-top: 7px; border: 1px solid #2b4a62; border-radius: 9px; padding: 11px 12px; background: #0a1c2b; color: #eef7ff; font: inherit; }
button { cursor: pointer; background: #1e9e70; border-color: #42d49c; font-weight: 700; }
button.secondary { margin-top: 10px; background: transparent; border-color: #42647d; color: #c7d8e8; }
.preview { min-height: 390px; }
.api-card { grid-column: 1; }
.preview { grid-column: 2; grid-row: 1 / span 2; }
.actions { display: grid; grid-template-columns: 1fr; gap: 8px; }
.actions button { margin-top: 0; }
.api-status { min-height: 2.5em; margin: 14px 0 0; color: #91a8bb; font-size: .78rem; line-height: 1.45; }
.api-status.ok { color: #8cf0c1; }
.api-status.error { color: #ffb7be; }
.preview-head { display:flex; justify-content:space-between; align-items:center; }
.status { border-radius: 999px; padding: 5px 9px; font-size: .72rem; background: #314254; color: #d5e3ef; }
.status.ok { background: #164d3d; color: #8cf0c1; }
.status.error { background: #5b2730; color: #ffb7be; }
pre { overflow: auto; margin: 0; min-height: 315px; color: #bfe6ff; font-size: .78rem; line-height: 1.5; }
footer { color: #6f879b; font-size: .75rem; margin-top: 20px; }
@media (max-width: 760px) { .grid { grid-template-columns: 1fr; } .api-card, .preview { grid-column: 1; grid-row: auto; } .shell { padding-top: 28px; } }