/* Temperature Sensor & Kalman Filter: signal processing, slate + orange (thermal), minim gimmick */
:root{
  --slate-900: #1c1917;
  --slate-800: #292420;
  --slate-700: #3a332c;
  --orange-600: #c2410c;
  --orange-500: #ea580c;
  --orange-400: #fb923c;
  --orange-100: #ffedd5;
  --ink: #1c1917;
  --muted: #6b625a;
  --line: #e7e0d8;
  --bg: #faf8f5;
  --panel: #ffffff;
  --good: #16a34a;
  --cool: #38bdf8;
  --radius: 10px;
  --shadow: 0 4px 14px rgba(28,25,23,.08);
  --mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
}

*{box-sizing:border-box}
html,body{height:100%}
body{ margin:0; font: 16px/1.55 ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif; color: var(--ink); background: var(--bg); }
.container{ max-width: 1120px; margin: 0 auto; padding: 0 20px; }
a{ color: var(--orange-600); }

.topbar{ border-bottom: 1px solid var(--line); background: rgba(250,248,245,.9); backdrop-filter: blur(6px); position: sticky; top:0; z-index:20; }
.topbar-inner{ display:flex; align-items:center; justify-content:space-between; padding: 14px 20px; max-width:1120px; margin:0 auto; gap:16px; flex-wrap:wrap; }
.brand-mark{ display:flex; align-items:center; gap:10px; text-decoration:none; color:inherit; }
.brand-mark .logo-dot{
  width:32px; height:32px; border-radius:9px;
  background: linear-gradient(135deg, var(--orange-500), var(--orange-600));
  display:grid; place-items:center; color:#fff; font-weight:800; font-size:13px;
}
.brand-mark .name{ font-weight:800; font-size:16px; letter-spacing:.2px; color: var(--ink); }
.brand-mark .name small{ display:block; font-weight:500; font-size:11px; color:var(--muted); letter-spacing:.4px; text-transform:uppercase; }
.back-link{ font-size:13.5px; color: var(--muted); text-decoration:none; display:inline-flex; align-items:center; gap:6px; }
.back-link:hover{ color: var(--orange-600); }

.hero{ padding: 64px 0 52px; display:grid; grid-template-columns: 1.1fr .9fr; gap:48px; align-items:center; }
.hero .eyebrow{ text-transform:uppercase; letter-spacing:.12em; font-size:12px; font-weight:700; color: var(--orange-600); margin:0 0 10px; }
.hero h1{ margin:0 0 10px; font-size: clamp(28px, 4vw, 42px); line-height:1.15; letter-spacing:-.01em; }
.hero p.lead{ margin:0 0 22px; color: var(--muted); font-size: 17px; max-width: 62ch; }
.hero-tags{ display:flex; flex-wrap:wrap; gap:8px; margin-bottom:22px; }
.tag{ font-size:12.5px; font-weight:600; padding:5px 10px; border-radius:999px; border:1px solid var(--line); background:#fff; color: var(--slate-800); }
.hero-cta-row{ display:flex; flex-wrap:wrap; gap:10px; }
.hero-cta-row .btn{ text-decoration:none; }

/* ===== HERO DEVICE: raw vs filtered chart ===== */
.hero-device{ display:flex; flex-direction:column; align-items:center; gap:14px; }
.device-panel{
  width:100%; max-width:360px;
  background: linear-gradient(180deg, var(--slate-800), var(--slate-900));
  border-radius: 20px; padding: 18px 18px 20px;
  box-shadow: 0 24px 48px rgba(28,25,23,.32), inset 0 1px 0 rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.06);
}
.device-topline{ display:flex; align-items:center; justify-content:space-between; margin-bottom:12px; }
.device-chip{ font-family: var(--mono); font-size:11px; font-weight:700; color:#ffcda6; background: rgba(255,255,255,.08); padding:3px 8px; border-radius:6px; letter-spacing:.05em; }
.device-legend{ display:flex; gap:10px; font-family: var(--mono); font-size:10px; }
.legend-item{ display:flex; align-items:center; gap:4px; color:#cbc2b8; }
.legend-dot{ width:8px; height:8px; border-radius:50%; display:inline-block; }
.dot-raw{ background: var(--orange-400); }
.dot-filtered{ background: var(--cool); }

.chart-box{ background:#15120f; border-radius:8px; padding:10px; box-shadow: inset 0 2px 6px rgba(0,0,0,.4); margin-bottom:12px; }
.chart-box svg{ display:block; width:100%; height:auto; }

.temp-readouts{ display:flex; justify-content:space-between; margin-bottom:12px; }
.temp-readout{ text-align:left; }
.temp-readout .lbl{ font-family: var(--mono); font-size:10px; color:#a89a8c; text-transform:uppercase; letter-spacing:.05em; }
.temp-readout .val{ font-family: var(--mono); font-size:17px; font-weight:700; }
.val-raw{ color: var(--orange-400); }
.val-filtered{ color: var(--cool); }

.device-controls{ display:flex; align-items:center; justify-content:space-between; }
.device-status{ display:flex; align-items:center; gap:6px; font-family: var(--mono); font-size:11px; color:#cbc2b8; }
.led{ width:8px; height:8px; border-radius:50%; display:inline-block; background:#22c55e; box-shadow:0 0 6px rgba(34,197,94,.8); }
.device-buttons{ display:flex; gap:8px; }
.device-btn{ font-size:11px; font-weight:700; color:#ffe7d1; background: rgba(255,255,255,.08); border:1px solid rgba(255,255,255,.14); padding:6px 12px; border-radius:7px; }
.device-caption{ font-size:12.5px; color: var(--muted); text-align:center; max-width:300px; }
.mock-hint{ font-size:11px; font-weight:700; letter-spacing:.06em; text-transform:uppercase; color:#c2410c; background: rgba(234,88,12,.12); border:1px solid rgba(234,88,12,.28); padding:2px 8px; border-radius:999px; display:inline-block; margin-bottom:6px; }

.section{ padding: 56px 0; border-top: 1px solid var(--line); }
.section-head{ max-width: 680px; margin: 0 0 28px; }
.section-head .kicker{ font-size:12.5px; font-weight:700; color: var(--orange-600); text-transform:uppercase; letter-spacing:.1em; margin:0 0 8px; }
.section-head h2{ margin:0 0 8px; font-size: clamp(22px,3vw,28px); letter-spacing:-.01em; }
.section-head p{ margin:0; color: var(--muted); font-size:15.5px; }

.checklist{ list-style:none; margin:0; padding:0; display:grid; gap:12px; }
.checklist.grid-2{ grid-template-columns: repeat(2, 1fr); }
.checklist li{ display:flex; align-items:flex-start; gap:10px; font-size:14.5px; color: var(--ink); }
.checklist svg{ flex-shrink:0; width:18px; height:18px; margin-top:2px; stroke: var(--good); fill:none; stroke-width:2.4; stroke-linecap:round; stroke-linejoin:round; }
@media (max-width:640px){ .checklist.grid-2{ grid-template-columns:1fr; } }

.flow-row{ display:flex; flex-wrap:wrap; align-items:center; gap:8px; margin-bottom:18px; }
.flow-step{ background: var(--orange-100); border:1px solid rgba(234,88,12,.2); border-radius:999px; padding:8px 14px; font-size:13px; font-weight:700; color: var(--orange-600); white-space:nowrap; }
.flow-arrow{ color: var(--muted); font-size:14px; flex-shrink:0; }

.grid-3{ display:grid; grid-template-columns: repeat(auto-fit, minmax(220px,1fr)); gap:16px; }
.panel{ background: var(--panel); border:1px solid var(--line); border-radius: var(--radius); padding:18px; box-shadow: var(--shadow); }
.panel .icon-chip{ width:38px; height:38px; border-radius:9px; margin-bottom:10px; background: var(--orange-100); color: var(--orange-600); display:grid; place-items:center; }
.panel .icon-chip svg{ width:20px; height:20px; fill:none; stroke:currentColor; stroke-width:2; stroke-linecap:round; stroke-linejoin:round; }
.panel h3{ margin:0 0 6px; font-size:15.5px; }
.panel p{ margin:0; color: var(--muted); font-size:14px; }

.focus-tags{ display:flex; flex-wrap:wrap; gap:8px; }
.focus-tag{ background: var(--orange-100); color: var(--orange-600); border:1px solid rgba(194,65,12,.22); border-radius:999px; padding:6px 12px; font-size:13px; font-weight:700; }

.status-card{ background: linear-gradient(135deg, var(--slate-800), var(--slate-900)); color:#fff; border-radius:16px; padding:26px 28px; }
.status-card .kicker{ color:#ffb27a; }
.status-card h3{ margin:0 0 8px; font-size:19px; }
.status-card p{ margin:0; color:#e0d8cf; font-size:14.5px; max-width:62ch; }

.btn{ display:inline-flex; align-items:center; gap:6px; text-decoration:none; padding:11px 18px; border-radius:10px; font-weight:700; font-size:14.5px; border:1px solid var(--line); color: var(--ink); background:#fff; cursor:pointer; transition: transform .12s ease, box-shadow .12s ease; }
.btn.primary{ background: linear-gradient(135deg, var(--orange-500), var(--orange-600)); border-color:transparent; color:#fff; box-shadow: 0 8px 18px rgba(194,65,12,.28); }
.btn:hover{ transform: translateY(-1px); }

.site-footer{ padding: 32px 0 48px; text-align:center; color: var(--muted); font-size:13.5px; }
.site-footer a{ color: var(--orange-600); }

@media (max-width:840px){ .hero{ grid-template-columns:1fr; } }