:root {
  --ink: #0f172a;
  --muted: #58657a;
  --paper: #f7f5ef;
  --white: #ffffff;
  --navy: #131d33;
  --blue: #2563eb;
  --blue-soft: #dfe9fb;
  --red: #f94144;
  --red-soft: #ffe3e4;
  --line: rgba(15, 23, 42, 0.1);
  --shadow: 0 24px 60px rgba(15, 23, 42, 0.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(37, 99, 235, 0.12), transparent 26%),
    radial-gradient(circle at top right, rgba(249, 65, 68, 0.08), transparent 22%),
    linear-gradient(180deg, #fbfaf7 0%, #f2efe7 100%);
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
}

.page-shell {
  width: min(1240px, calc(100vw - 32px));
  margin: 20px auto 34px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 12px 0 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-mark,
.device-logo {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow);
}

.brand-mark img,
.device-logo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand strong,
h1, h2, h3 {
  font-family: "Sora", "Segoe UI", sans-serif;
}

.brand strong {
  display: block;
  font-size: 18px;
}

.brand span {
  display: block;
  color: var(--muted);
  font-size: 13px;
  margin-top: 3px;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.nav a,
.btn,
.footer-links a {
  text-decoration: none;
}

.nav a {
  color: var(--ink);
  font-weight: 600;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(420px, 0.92fr);
  gap: 28px;
  align-items: start;
}

.hero-copy,
.device-panel,
.feature-card,
.chart-card,
.scenario {
  border-radius: 28px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.74);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow);
}

.hero-copy {
  padding: 38px;
}

.kicker {
  margin: 0 0 12px;
  color: var(--blue);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 12px;
  font-weight: 700;
}

h1 {
  margin: 0 0 18px;
  font-size: clamp(38px, 5vw, 64px);
  line-height: 1.02;
}

.lede,
.section-note {
  margin: 0;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 18px;
  border-radius: 999px;
  font-weight: 700;
}

.btn.solid {
  color: var(--white);
  background: linear-gradient(150deg, var(--blue), #1d4ed8);
}

.btn.ghost {
  color: var(--ink);
  border: 1px solid rgba(15, 23, 42, 0.12);
  background: rgba(255, 255, 255, 0.84);
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.hero-tags span {
  padding: 10px 14px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.06);
  border: 1px solid rgba(15, 23, 42, 0.08);
  color: var(--ink);
  font-weight: 600;
  font-size: 14px;
}

.device-panel {
  padding: 18px;
}

.device-head {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
  padding: 8px 6px 18px;
}

.device-info {
  display: flex;
  align-items: flex-start;
  gap: 14px;
}

.device-info strong {
  display: block;
  font-family: "Sora", "Segoe UI", sans-serif;
  font-size: 24px;
}

.device-info span,
.device-info small {
  display: block;
}

.device-info span {
  margin-top: 2px;
  font-size: 18px;
  color: var(--blue);
  font-weight: 700;
}

.device-info small {
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
}

.status-stack {
  display: grid;
  gap: 12px;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(15, 23, 42, 0.08);
  box-shadow: 0 14px 34px rgba(15, 23, 42, 0.08);
  font-size: 17px;
}

.status-pill i {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #16a34a;
  box-shadow: 0 0 0 6px rgba(22, 163, 74, 0.12);
}

.control-card {
  padding: 24px;
  border-radius: 28px;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 22px 46px rgba(15, 23, 42, 0.08);
}

.control-card + .control-card {
  margin-top: 22px;
}

.control-card h2 {
  margin: 0 0 18px;
  font-size: 22px;
}

.figure-stage {
  padding: 12px 8px 6px;
}

.figure-stage svg {
  display: block;
  width: 100%;
  height: auto;
}

.valve-stage {
  padding-bottom: 0;
}

.state-line {
  margin: 10px 0 0;
  text-align: center;
  color: var(--muted);
  font-size: 17px;
}

.state-line strong {
  color: var(--ink);
  font-size: 22px;
}

.control-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 22px;
}

.control-actions.three {
  grid-template-columns: 0.72fr 1fr 1fr;
}

.command-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 68px;
  padding: 0 18px;
  border-radius: 22px;
  font-family: "Sora", "Segoe UI", sans-serif;
  font-size: 18px;
  font-weight: 700;
}

.command-btn.dark {
  color: var(--white);
  background: var(--navy);
}

.command-btn.danger {
  color: var(--white);
  background: var(--red);
}

.command-btn.danger.soft {
  background: var(--red);
}

.command-btn.light {
  color: var(--navy);
  background: #edf1f7;
  border: 1px solid rgba(15, 23, 42, 0.08);
}

.section {
  padding: 58px 0;
}

.contrast {
  position: relative;
}

.section-heading {
  display: grid;
  gap: 14px;
  margin-bottom: 28px;
}

.feature-grid,
.chart-grid,
.scenario-grid {
  display: grid;
  gap: 18px;
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.chart-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.scenario-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card,
.chart-card,
.scenario {
  padding: 24px;
}

.feature-card h3,
.chart-card strong,
.scenario h3 {
  margin: 0 0 12px;
}

.feature-card p,
.chart-card p,
.scenario p {
  margin: 0;
  color: var(--muted);
  line-height: 1.72;
}

.chart-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
}

.chart-head strong {
  font-family: "Sora", "Segoe UI", sans-serif;
  font-size: 18px;
}

.chart-head span {
  color: var(--muted);
  font-size: 13px;
  font-weight: 600;
}

.chart-card svg {
  width: 100%;
  height: auto;
  margin-bottom: 16px;
}

.grid-line {
  stroke: rgba(15, 23, 42, 0.16);
  stroke-width: 2;
}

.grid-line.faint {
  stroke: rgba(15, 23, 42, 0.08);
}

.chart-line {
  fill: none;
  stroke-width: 8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.chart-line.stepped {
  stroke-linecap: square;
}

.chart-line.warm,
.chart-dot.warm {
  stroke: #f97316;
  fill: #f97316;
}

.chart-line.cool,
.chart-dot.cool {
  stroke: #2563eb;
  fill: #2563eb;
}

.chart-line.bright {
  stroke: #ef4444;
}

.chart-line.soft {
  stroke: #60a5fa;
}

.alarm-dot {
  fill: #ef4444;
}

.footer {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  padding: 18px 0 0;
}

.footer strong {
  font-family: "Sora", "Segoe UI", sans-serif;
}

.footer p {
  margin: 8px 0 0;
  color: var(--muted);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.footer-links a {
  color: var(--blue);
  font-weight: 700;
}

@media (max-width: 1080px) {
  .hero {
    grid-template-columns: 1fr;
  }

  .feature-grid,
  .chart-grid,
  .scenario-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100vw - 20px, 100%);
  }

  .topbar,
  .device-head,
  .footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero-copy {
    padding: 26px;
  }

  .device-info strong {
    font-size: 20px;
  }

  .device-info span {
    font-size: 16px;
  }

  .feature-grid,
  .chart-grid,
  .scenario-grid,
  .control-actions,
  .control-actions.three {
    grid-template-columns: 1fr;
  }

  .control-card {
    padding: 18px;
  }

  .status-stack {
    width: 100%;
  }

  .status-pill {
    width: 100%;
    justify-content: flex-start;
  }
}