:root {
  color-scheme: light dark;
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  --surface: #f6f8fb;
  --surface-alt: #ffffff;
  --text: #111827;
  --muted: #475569;
  --border: rgba(15, 23, 42, 0.1);
  --shadow: 0 14px 30px rgba(15, 23, 42, 0.12);
  --good: #059669;
  --warning: #d97706;
  --critical: #dc2626;
  --label: #64748b;
  background: var(--surface);
  color: var(--text);
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface: #0b1220;
    --surface-alt: #111c33;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --border: rgba(148, 163, 184, 0.2);
    --shadow: 0 18px 36px rgba(2, 6, 23, 0.55);
    --label: #cbd5f5;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--surface);
  color: var(--text);
}

.container {
  width: min(72rem, 92vw);
  margin-inline: auto;
}

.page-header {
  padding: clamp(2.5rem, 5vw, 4rem) 0 clamp(2rem, 4vw, 3rem);
  background: linear-gradient(180deg, rgba(37, 99, 235, 0.12), transparent 60%);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.75rem;
  color: var(--label);
  margin: 0 0 0.75rem;
}

.page-header h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.2;
}

.header-actions {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 1rem;
}

.home-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.95rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: none;
  background: rgba(148, 163, 184, 0.2);
  border: 1px solid rgba(148, 163, 184, 0.35);
  color: #1f2937;
  text-decoration: none;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.home-link:hover,
.home-link:focus-visible {
  background: rgba(191, 219, 254, 0.85);
  border-color: rgba(191, 219, 254, 0.5);
  color: #0f172a;
  transform: translateY(-1px);
}

.home-link:focus-visible {
  outline: 2px solid rgba(191, 219, 254, 0.8);
  outline-offset: 2px;
}

.lede {
  margin: 0;
  max-width: 52ch;
  color: var(--muted);
}

.plant-grid {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  padding-block: clamp(2rem, 5vw, 3rem);
}

@media (min-width: 62rem) {
  .plant-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.plant-card {
  background: var(--surface-alt);
  border-radius: 1.25rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  padding: clamp(1.5rem, 3vw, 2rem);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.plant-card__header {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.plant-card__header h2 {
  margin: 0;
  font-size: 1.35rem;
  line-height: 1.25;
}

.plant-card__badge {
  align-self: flex-start;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  background: rgba(37, 99, 235, 0.14);
  color: #2563eb;
}

.plant-card__badge--good {
  background: rgba(5, 150, 105, 0.18);
  color: var(--good);
}

.plant-card__badge--warning {
  background: rgba(217, 119, 6, 0.2);
  color: var(--warning);
}

.plant-card__badge--critical {
  background: rgba(220, 38, 38, 0.2);
  color: var(--critical);
}

.kpi-grid {
  display: grid;
  gap: 1rem;
  margin: 0;
}

.kpi-tile {
  padding: 1.1rem 1.2rem;
  border-radius: 1rem;
  display: grid;
  gap: 0.45rem;
  background: rgba(148, 163, 184, 0.12);
  border: 1px solid transparent;
  transition: transform 150ms ease, border-color 150ms ease, background-color 150ms ease;
}

.kpi-tile:hover,
.kpi-tile:focus-within {
  transform: translateY(-2px);
}

.kpi-tile dt {
  margin: 0;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--label);
}

.kpi-tile dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
}

.kpi-value {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
}

.kpi-unit {
  font-size: 0.85rem;
  text-transform: uppercase;
  color: var(--label);
  letter-spacing: 0.08em;
}

.kpi-trend {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-weight: 600;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  color: var(--muted);
}

.kpi-trend svg {
  width: 0.9rem;
  height: 0.9rem;
  fill: currentColor;
}

.kpi-trend--up {
  color: var(--warning);
}

.kpi-trend--down {
  color: var(--good);
}

.kpi-trend--steady {
  color: var(--muted);
}

.kpi-tile[data-state="good"] {
  background: rgba(5, 150, 105, 0.12);
  border-color: rgba(5, 150, 105, 0.32);
}

.kpi-tile[data-state="warning"] {
  background: rgba(217, 119, 6, 0.12);
  border-color: rgba(217, 119, 6, 0.34);
}

.kpi-tile[data-state="critical"] {
  background: rgba(220, 38, 38, 0.12);
  border-color: rgba(220, 38, 38, 0.4);
}

.kpi-tile[data-state="critical"] .kpi-trend--up {
  color: var(--critical);
}

.footer {
  padding: 2.5rem 0 1.5rem;
}

.footer-actions {
  position: relative;
  display: flex;
  justify-content: flex-end;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  padding: 0.55rem 1.2rem;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: 0.04em;
  text-transform: none;
  transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.btn.ghost {
  background: transparent;
  color: inherit;
}

.btn:hover,
.btn:focus-visible {
  transform: translateY(-1px);
  background: rgba(148, 163, 184, 0.18);
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.2);
  border-color: rgba(148, 163, 184, 0.45);
}

.btn:focus-visible {
  outline: 2px solid rgba(59, 130, 246, 0.5);
  outline-offset: 2px;
}

.back-to-top {
  position: fixed;
  bottom: clamp(1.25rem, 4vw, 2.5rem);
  left: 50%;
  transform: translateX(-50%);
  transform-origin: center;
  z-index: 90;
  padding: 0.6rem 1.35rem;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.85);
  color: #f8fafc;
  border: 1px solid rgba(148, 163, 184, 0.45);
  box-shadow: 0 18px 36px rgba(15, 23, 42, 0.35);
  backdrop-filter: blur(12px);
  letter-spacing: 0.06em;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.25s ease, visibility 0.25s ease, background-color 0.2s ease, border-color 0.2s ease;
}

.back-to-top::before {
  content: "\2191";
  font-size: 1.05rem;
  line-height: 1;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  animation: tilesBackToTopPulse 6s ease-in-out infinite;
}

.back-to-top:hover,
.back-to-top:focus-visible {
  transform: translateX(-50%);
  background: rgba(37, 99, 235, 0.85);
  border-color: rgba(96, 165, 250, 0.5);
  color: #f8fafc;
}

@keyframes tilesBackToTopPulse {
  0%,
  100% {
    box-shadow: 0 18px 36px rgba(15, 23, 42, 0.35);
  }
  50% {
    box-shadow: 0 22px 44px rgba(37, 99, 235, 0.28);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

@media (max-width: 40rem) {
  .header-actions {
    justify-content: flex-start;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    background-color: #0b1220;
    color: #e2e8f0;
  }

  .home-link {
    background: rgba(148, 163, 184, 0.25);
    border-color: rgba(148, 163, 184, 0.45);
    color: #e2e8f0;
  }

  .home-link:hover,
  .home-link:focus-visible {
    background: rgba(59, 130, 246, 0.3);
    color: #f8fafc;
  }

  .btn {
    border-color: rgba(148, 163, 184, 0.45);
    color: #e2e8f0;
  }

  .btn:hover,
  .btn:focus-visible {
    background: rgba(59, 130, 246, 0.2);
    border-color: rgba(96, 165, 250, 0.45);
  }

  .back-to-top {
    background: rgba(15, 23, 42, 0.85);
    border-color: rgba(148, 163, 184, 0.45);
    color: #f8fafc;
  }

  .back-to-top:hover,
  .back-to-top:focus-visible {
    background: rgba(37, 99, 235, 0.85);
    border-color: rgba(96, 165, 250, 0.5);
    color: #f8fafc;
  }
}