:root {
  --bg: #0b0f14;
  --bg-soft: #10161e;
  --paper: #131a24;
  --paper-2: #182230;
  --ink: #e8eef4;
  --ink-dim: #9fb0c0;
  --ink-faint: #6c7d8e;
  --line: #22303f;
  --accent: #f5a65b;
  --accent-2: #7fd1c0;
  --green: #7fd1c0;
  --blue: #6ea8d8;
  --amber: #f5a65b;
  --red: #e07878;
  --quiet: #9fb0c0;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.page-width { max-width: 1080px; margin: 0 auto; padding: 0 28px; }

a { color: inherit; text-decoration: none; }

h1, h2 { line-height: 1.05; margin: 0; font-weight: 700; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.6rem, 6vw, 4.4rem); }
h2 { font-size: clamp(1.9rem, 4vw, 2.9rem); }
h2 span { color: var(--accent); }

.section-kicker {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.72rem;
  color: var(--ink-faint);
  margin: 0 0 12px;
  font-weight: 600;
}
.light-kicker { color: var(--accent-2); }

.section-lead { color: var(--ink-dim); max-width: 640px; font-size: 1.05rem; }

/* ===================== NAV ===================== */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  background: rgba(11, 15, 20, 0.82);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; font-size: 1.02rem; display: flex; align-items: center; gap: 9px; }
.brand-mark { color: var(--accent); }
.nav-links { display: flex; align-items: center; gap: 22px; font-size: 0.88rem; color: var(--ink-dim); }
.nav-links a:hover { color: var(--ink); }

.api-status {
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--ink-dim);
}
.api-status.online { color: var(--green); border-color: rgba(127, 209, 192, 0.4); }
.api-status.offline { color: var(--red); border-color: rgba(224, 120, 120, 0.4); }

/* ===================== HERO ===================== */
.hero { padding: 72px 0 90px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 40px; align-items: center; }
.hero-sub { color: var(--ink-dim); max-width: 460px; margin: 22px 0 28px; font-size: 1.05rem; }
.hero-cta { display: flex; gap: 14px; }

.btn {
  display: inline-block;
  padding: 12px 22px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.92rem;
  border: 1px solid transparent;
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: #1a1207; }
.btn-primary:hover { filter: brightness(1.06); }
.btn-ghost { border-color: var(--line); color: var(--ink-dim); }
.btn-ghost:hover { color: var(--ink); border-color: var(--ink-faint); }

/* Meter visual */
.hero-visual { position: relative; min-height: 340px; display: flex; align-items: center; justify-content: center; }
.meter-body {
  position: relative;
  width: 220px; height: 220px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 30%, #22303f, #0f151d 70%);
  border: 10px solid #1b2531;
  box-shadow: 0 30px 60px rgba(0,0,0,0.45), inset 0 0 40px rgba(0,0,0,0.5);
}
.meter-face { position: absolute; inset: 18px; border-radius: 50%; background: #0d1218; border: 1px solid var(--line); }
.meter-rings { position: absolute; border-radius: 50%; border: 1px solid rgba(127,209,192,0.25); }
.ring-one { inset: 14px; }
.ring-two { inset: 30px; }
.meter-needle {
  position: absolute; left: 50%; top: 50%;
  width: 4px; height: 70px;
  background: var(--accent);
  transform-origin: bottom center;
  transform: translate(-50%, -100%) rotate(-30deg);
  border-radius: 2px;
}
.meter-center { position: absolute; left: 50%; top: 50%; width: 16px; height: 16px; border-radius: 50%; background: var(--accent); transform: translate(-50%, -50%); }
.meter-reading { position: absolute; left: 50%; top: 54%; transform: translateX(-50%); font-size: 1.6rem; font-weight: 700; color: var(--accent-2); }
.meter-unit { position: absolute; left: 50%; top: 66%; transform: translateX(-50%); font-size: 0.7rem; color: var(--ink-faint); letter-spacing: 0.1em; }
.meter-cap { position: absolute; top: -14px; left: 50%; transform: translateX(-50%); width: 70px; height: 20px; background: #1b2531; border-radius: 8px 8px 0 0; }
.meter-foot { position: absolute; bottom: -30px; left: 50%; transform: translateX(-50%); width: 90px; height: 24px; background: #1b2531; border-radius: 4px; }

.sensor-clip {
  position: absolute; right: 12%; top: 8%;
  display: flex; align-items: center; gap: 7px;
  font-size: 0.62rem; letter-spacing: 0.12em; color: var(--ink-dim);
  background: var(--paper-2); padding: 7px 11px; border-radius: 8px; border: 1px solid var(--line);
}
.sensor-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 10px var(--accent); animation: pulse 2s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.35; } }

.signal-orbit { position: absolute; border-radius: 50%; border: 1px dashed rgba(127,209,192,0.3); animation: spin 18s linear infinite; }
.orbit-a { width: 300px; height: 300px; }
.orbit-b { width: 360px; height: 360px; animation-direction: reverse; animation-duration: 26s; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ===================== SECTIONS ===================== */
.system-section { padding: 80px 0; }
.section-paper { background: var(--paper); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }

/* ===================== SIGNAL LAB ===================== */
.signal-lab {
  margin-top: 36px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
}
.signal-lab-top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--line);
}
.lab-status { display: flex; align-items: center; gap: 9px; font-size: 0.85rem; color: var(--ink-dim); }
.status-dot, .live-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--green); box-shadow: 0 0 8px var(--green); animation: pulse 2s infinite; }
.lab-label { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-faint); }

.signal-display { padding: 20px 20px 8px; text-align: center; }
.display-caption { font-size: 0.8rem; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 10px; }
#wave-canvas { width: 100%; max-width: 760px; height: 220px; }
.wave-ticks { display: flex; justify-content: space-between; font-size: 0.72rem; color: var(--ink-faint); padding: 4px 6px 14px; }

.view-tabs { display: flex; gap: 6px; padding: 0 20px 20px; flex-wrap: wrap; }
.view-tab {
  background: var(--paper-2); color: var(--ink-dim);
  border: 1px solid var(--line); border-radius: 8px;
  padding: 8px 15px; font-size: 0.85rem; cursor: pointer; font-weight: 600;
}
.view-tab.selected { background: var(--accent); color: #1a1207; border-color: var(--accent); }

/* ===================== PIPELINE ===================== */
.pipeline { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 40px; }
.pipeline-step {
  background: var(--paper); border: 1px solid var(--line); border-radius: 12px;
  padding: 18px; display: flex; flex-direction: column; gap: 4px;
}
.step-num { color: var(--accent); font-weight: 700; font-size: 0.85rem; }
.pipeline-step strong { font-size: 1rem; }
.pipeline-step span:last-child { color: var(--ink-dim); font-size: 0.85rem; }


/* ===================== DEMO ===================== */
.demo-card {
  margin-top: 36px;
  display: grid; grid-template-columns: 1fr 1fr;
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 16px;
  overflow: hidden;
}
.demo-controls { padding: 26px; border-right: 1px solid var(--line); }
.demo-card-label { display: flex; align-items: center; gap: 9px; font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.12em; color: var(--ink-dim); margin-bottom: 18px; }
.demo-controls-title { font-size: 0.9rem; color: var(--ink-faint); margin-bottom: 12px; }
.activity-options { display: flex; flex-direction: column; gap: 9px; }
.activity-options button {
  display: flex; align-items: center; gap: 11px;
  background: transparent; border: 1px solid var(--line); border-radius: 10px;
  color: var(--ink-dim); padding: 12px 15px; font-size: 0.94rem; cursor: pointer; text-align: left; font-weight: 600;
}
.activity-options button:hover { border-color: var(--ink-faint); color: var(--ink); }
.activity-options button.selected { border-color: var(--activity-color, var(--accent)); color: var(--ink); background: color-mix(in srgb, var(--activity-color, var(--accent)) 12%, transparent); }
.activity-radio { width: 10px; height: 10px; border-radius: 50%; border: 2px solid var(--ink-faint); flex: none; }
.activity-options button.selected .activity-radio { border-color: var(--activity-color, var(--accent)); background: var(--activity-color, var(--accent)); }
.demo-disclaimer { margin-top: 20px; font-size: 0.78rem; color: var(--ink-faint); display: flex; align-items: flex-start; gap: 8px; }

.demo-output { padding: 26px; display: flex; flex-direction: column; }
.output-top { display: flex; align-items: center; justify-content: space-between; font-size: 0.78rem; color: var(--ink-faint); text-transform: uppercase; letter-spacing: 0.1em; }
.inference-tag { background: var(--paper-2); border: 1px solid var(--line); border-radius: 999px; padding: 3px 10px; font-size: 0.68rem; color: var(--accent-2); }
.output-pattern { margin: 18px 0; }
.pattern-bars { display: flex; align-items: flex-end; gap: 5px; height: 90px; }
.pattern-bars span { flex: 1; border-radius: 3px 3px 0 0; background: var(--pattern-color, var(--accent)); opacity: 0.85; min-height: 4px; transition: height 0.4s ease, background-color 0.2s ease; }
.output-label { font-size: 1.4rem; font-weight: 700; margin-bottom: 12px; }
.output-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.meta-chip { background: var(--paper-2); border: 1px solid var(--line); border-radius: 999px; padding: 5px 12px; font-size: 0.8rem; color: var(--ink-dim); }
.output-explanation { color: var(--ink-dim); margin: 0 0 8px; font-size: 0.94rem; }
.output-action { color: var(--accent-2); margin: 0; font-size: 0.94rem; font-weight: 600; }

/* tone variants */
.demo-output.tone-quiet { border-color: rgba(159,176,192,0.18); }
.demo-output.tone-green { border-color: rgba(127,209,192,0.24); }
.demo-output.tone-blue { border-color: rgba(110,168,216,0.24); }
.demo-output.tone-amber,
.demo-output.tone-orange { border-color: rgba(245,166,91,0.24); }
.demo-output.tone-red { border-color: rgba(224,120,120,0.24); }

/* ===================== RECORDINGS ===================== */
.recordings-card {
  margin-top: 28px;
  background: var(--bg-soft); border: 1px solid var(--line); border-radius: 16px;
  padding: 24px 26px;
}
.recordings-head { margin-bottom: 16px; }
.recordings-note { color: var(--ink-faint); font-size: 0.85rem; margin: 0; }
.recordings-note code { background: var(--paper-2); padding: 2px 6px; border-radius: 5px; }
.recordings-controls { display: flex; gap: 12px; flex-wrap: wrap; }
.recordings-controls select {
  background: var(--paper-2); color: var(--ink);
  border: 1px solid var(--line); border-radius: 9px;
  padding: 11px 14px; font-size: 0.9rem; min-width: 220px;
}

/* ===================== LIVE PREVIEW ===================== */
section[id] { scroll-margin-top: 76px; }
#live-preview .demo-card { margin-top: 36px; }
.upload-wrap { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; margin: 4px 0 8px; }
#live-upload-btn { cursor: pointer; }
.warning {
  color: #f0b4b4; background: rgba(224,120,120,0.08);
  border: 1px solid rgba(224,120,120,0.35);
  border-radius: 10px; padding: 10px 14px; font-size: 0.9rem; margin: 12px 0 0;
}
.demo-output[hidden] { display: none; }
#live-preview .output-pattern { margin: 18px 0; }
#live-canvas { width: 100%; height: auto; display: block; border-radius: 10px; background: var(--paper-2); border: 1px solid var(--line); }
.live-lists { margin-top: 14px; display: grid; gap: 10px; }
.live-lists .block-label { color: var(--ink-faint); font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.1em; }
.blk-list { margin: 6px 0 0; padding-left: 20px; color: var(--ink-dim); font-size: 0.94rem; }
.blk-list li { margin-bottom: 6px; }

/* ===================== FOOTER ===================== */
.site-footer { border-top: 1px solid var(--line); padding: 30px 0; }
.site-footer .page-width { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.site-footer { color: var(--ink-faint); font-size: 0.85rem; }
.footer-note { text-align: right; }

/* ===================== RESPONSIVE ===================== */
@media (max-width: 860px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; min-height: 280px; }
  .pipeline { grid-template-columns: 1fr 1fr; }
  .demo-card { grid-template-columns: 1fr; }
  .demo-controls { border-right: none; border-bottom: 1px solid var(--line); }
  .nav-links a { display: none; }
}