:root {
  --bg: #0e1116;
  --surface: #161b22;
  --surface-2: #1c2530;
  --border: #2a3441;
  --text: #e6edf3;
  --muted: #8b98a5;
  --accent: #4f8cff;
  --accent-2: #7c5cff;
  --hot: #ff5c5c;
  --warm: #ffb020;
  --cold: #4f8cff;
  --radius: 14px;
  --maxw: 1080px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* Header / footer */
.site-header { border-bottom: 1px solid var(--border); background: rgba(14,17,22,.8); backdrop-filter: blur(8px); position: sticky; top: 0; z-index: 10; }
.nav { display: flex; align-items: center; justify-content: space-between; height: 62px; }
.brand { font-weight: 700; font-size: 1.1rem; color: var(--text); }
.brand:hover { text-decoration: none; }
.nav-links { display: flex; align-items: center; gap: 22px; }
.nav-links a { color: var(--muted); }
.nav-links a:hover { color: var(--text); text-decoration: none; }

.site-footer { border-top: 1px solid var(--border); margin-top: 80px; padding: 28px 0; color: var(--muted); }
.site-footer .container { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* Buttons */
.btn {
  display: inline-block; padding: 11px 20px; border-radius: 10px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff; font-weight: 600; border: none; cursor: pointer; font-size: .95rem;
}
.btn:hover { text-decoration: none; filter: brightness(1.08); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-sm { padding: 7px 14px; font-size: .85rem; }

/* Hero */
.hero { padding: 90px 0 40px; text-align: center; }
.hero h1 { font-size: clamp(2rem, 5vw, 3.2rem); margin: 0 0 12px; letter-spacing: -.02em; }
.lead { font-size: 1.15rem; color: var(--muted); margin: 0 auto 24px; max-width: 640px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* Sections */
.section { padding: 48px 0; }
.section.center { text-align: center; }
.section-head { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 24px; }
.section h2, .section h1 { letter-spacing: -.02em; }

/* Grid + cards */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.case-card { transition: border-color .15s, transform .15s; }
.case-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.case-card-link { color: var(--text); display: block; }
.case-card-link:hover { text-decoration: none; }
.case-card h3 { margin: 0 0 4px; }

.muted { color: var(--muted); font-size: .9rem; margin: 0 0 10px; }

.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.tag { font-size: .78rem; color: var(--muted); background: var(--surface-2); border: 1px solid var(--border); padding: 3px 10px; border-radius: 999px; }

/* Case detail */
.case-detail { max-width: 760px; margin: 0 auto; padding: 40px 0; }
.back { display: inline-block; margin-bottom: 20px; color: var(--muted); }
.case-detail h1 { font-size: clamp(1.7rem, 4vw, 2.4rem); margin: 4px 0 12px; }
.case-body h2 { margin-top: 32px; font-size: 1.25rem; }
.metrics { display: flex; flex-wrap: wrap; gap: 16px; margin: 28px 0; }
.metric { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px 22px; }
.metric-value { display: block; font-size: 1.8rem; font-weight: 700; color: var(--accent); }
.metric-label { color: var(--muted); font-size: .85rem; }
.cta-box { margin-top: 40px; padding: 24px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); }

/* Demo stands */
.demo { max-width: 640px; }
.demo textarea {
  width: 100%; background: var(--bg); color: var(--text); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 14px; font: inherit; resize: vertical;
}
.demo textarea:focus { outline: none; border-color: var(--accent); }
.form-row { display: flex; align-items: center; gap: 14px; margin-top: 12px; }

.demo-result:empty { display: none; }
.demo-result { margin-top: 20px; }
.result-card { background: var(--surface-2); border: 1px solid var(--border); border-left: 3px solid var(--border); border-radius: 10px; padding: 16px 18px; }
.result-card.temp-hot { border-left-color: var(--hot); }
.result-card.temp-warm { border-left-color: var(--warm); }
.result-card.temp-cold { border-left-color: var(--cold); }
.result-row { display: flex; justify-content: space-between; padding: 6px 0; }
.result-label { color: var(--muted); }
.result-value { font-weight: 600; }
.badge { padding: 2px 12px; border-radius: 999px; font-size: .82rem; font-weight: 600; }
.badge-hot { background: rgba(255,92,92,.15); color: var(--hot); }
.badge-warm { background: rgba(255,176,32,.15); color: var(--warm); }
.badge-cold { background: rgba(79,140,255,.15); color: var(--cold); }

/* HTMX indicator */
.htmx-indicator { opacity: 0; transition: opacity .2s; color: var(--muted); }
.htmx-request .htmx-indicator, .htmx-indicator.htmx-request { opacity: 1; }
.htmx-request.htmx-indicator { opacity: 1; }

@media (max-width: 560px) {
  .nav-links { gap: 14px; }
  .section-head { flex-direction: column; gap: 4px; align-items: flex-start; }
}