:root {
  --font-sans: "Manrope", sans-serif;
  --font-mono: "JetBrains Mono", monospace;
  --bg: #f0f2f5;
  --bg-soft: #e8eaef;
  --surface: #ffffff;
  --surface-elevated: #ffffff;
  --text: #0c0e12;
  --text-muted: #5c6174;
  --line: #dce0e8;
  --line-strong: #c4cad6;
  --accent: #0e7490;
  --accent-soft: #ecfeff;
  --accent-glow: rgba(14, 116, 144, 0.25);
  --ok: #059669;
  --ok-soft: #d1fae5;
  --ok-glow: rgba(5, 150, 105, 0.2);
  --warn: #b45309;
  --warn-soft: #fef3c7;
  --danger: #dc2626;
  --danger-soft: #fee2e2;
  --danger-glow: rgba(220, 38, 38, 0.2);
  --ring: #0e7490;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 2px 8px rgba(12, 14, 18, 0.04);
  --shadow-card: 0 4px 20px rgba(12, 14, 18, 0.06), 0 1px 3px rgba(12, 14, 18, 0.04);
  --shadow-card-hover: 0 12px 40px rgba(12, 14, 18, 0.08), 0 2px 8px rgba(12, 14, 18, 0.04);
  --countdown-progress: 0;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  color: var(--text);
  background:
    radial-gradient(ellipse 120% 80% at 50% -20%, rgba(14, 116, 144, 0.08), transparent 50%),
    radial-gradient(ellipse 80% 60% at 100% 50%, rgba(14, 116, 144, 0.04), transparent 45%),
    linear-gradient(165deg, #f6f7fa 0%, var(--bg) 50%, #eaecef 100%);
  background-attachment: fixed;
}

code {
  font-family: var(--font-mono);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 0.15rem 0.45rem;
  font-size: 0.82rem;
  color: var(--text);
}

h1,
h2 {
  margin: 0;
  line-height: 1.25;
}

h1 {
  font-size: clamp(1.65rem, 1.4rem + 0.9vw, 2.35rem);
  letter-spacing: -0.03em;
  font-weight: 800;
  color: var(--text);
}

h2 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

p {
  margin: 0;
}

.app-shell {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 20px 64px;
}

/* Cards: elevation and hover */
.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition), border-color var(--transition);
}

.card:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: var(--line-strong);
}

/* Hero */
.hero {
  padding: 24px 26px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  background: linear-gradient(135deg, var(--surface) 0%, var(--surface-elevated) 100%);
  border-radius: var(--radius);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), transparent 60%);
  opacity: 0.9;
}

.hero p {
  margin-top: 10px;
  color: var(--text-muted);
  max-width: 72ch;
  font-size: 0.95rem;
  line-height: 1.5;
}

.hero .btn {
  flex-shrink: 0;
}

.main-grid {
  margin-top: 20px;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 18px;
}

/* Status panel — command state */
.status-panel {
  grid-column: span 8;
  padding: 22px;
}

.status-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.command-value {
  margin-top: 16px;
  font-size: clamp(2.4rem, 1.7rem + 2.2vw, 3.8rem);
  font-weight: 800;
  letter-spacing: -0.04em;
  text-transform: uppercase;
  transition: color var(--transition), text-shadow var(--transition);
}

/* State-based command value color */
.status-panel[data-state="start"] .command-value {
  color: var(--ok);
  text-shadow: 0 0 24px var(--ok-glow);
}

.status-panel[data-state="stop"] .command-value {
  color: var(--danger);
  text-shadow: 0 0 24px var(--danger-glow);
}

.status-panel[data-state="unknown"] .command-value {
  color: var(--warn);
}

.meta-row {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Mode panel */
.mode-panel {
  grid-column: span 4;
  padding: 22px;
}

.mode-toggle {
  margin-top: 14px;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 5px;
  border-radius: 12px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.mode-btn {
  border: 1px solid transparent;
  background: transparent;
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
  color: var(--text-muted);
  transition: all var(--transition);
}

.mode-btn:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.6);
}

.mode-btn.active {
  color: var(--text);
  border-color: var(--line-strong);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.subtext {
  margin-top: 12px;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

/* Control panels */
.control-panel {
  grid-column: span 6;
  padding: 22px;
}

.button-row {
  margin-top: 16px;
  display: flex;
  gap: 12px;
}

/* Buttons */
.btn {
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 0.95rem;
  padding: 12px 20px;
  transition: transform 0.15s ease, box-shadow var(--transition), filter var(--transition);
}

.btn:active {
  transform: scale(0.98);
}

.btn-success {
  background: var(--ok);
  color: #fff;
  border: 1px solid var(--ok);
  box-shadow: 0 2px 8px rgba(5, 150, 105, 0.25);
}

.btn-success:hover {
  filter: brightness(1.06);
  box-shadow: 0 4px 14px rgba(5, 150, 105, 0.35);
}

.btn-error {
  background: var(--danger);
  color: #fff;
  border: 1px solid var(--danger);
  box-shadow: 0 2px 8px rgba(220, 38, 38, 0.25);
}

.btn-error:hover {
  filter: brightness(1.06);
  box-shadow: 0 4px 14px rgba(220, 38, 38, 0.35);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--line-strong);
}

.btn-secondary:hover {
  background: var(--bg-soft);
  border-color: var(--line);
}

.btn:focus-visible,
.mode-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Log / Activity */
.log-panel {
  grid-column: span 12;
  padding: 22px;
}

.log-panel h2 {
  display: flex;
  align-items: center;
  gap: 8px;
}

.log-panel h2::after {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--ok);
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.6; transform: scale(0.9); }
}

.feedback {
  margin-top: 14px;
  border: 1px solid var(--line-strong);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 0.92rem;
  color: var(--text-muted);
  min-height: 52px;
  background: var(--bg-soft);
  transition: border-color var(--transition), background var(--transition), color var(--transition);
}

/* Auto layout & countdown */
.auto-layout {
  margin-top: 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.countdown-ring {
  width: 160px;
  aspect-ratio: 1 / 1;
  border-radius: 999px;
  display: grid;
  place-items: center;
  background:
    conic-gradient(var(--ring) calc(var(--countdown-progress) * 1%), var(--line) 0%),
    radial-gradient(circle at center, var(--surface) 65%, transparent 66%);
  border: 2px solid var(--line);
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.5);
}

.countdown-inner {
  display: grid;
  place-items: center;
  text-align: center;
}

.countdown-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
}

.countdown-value {
  margin-top: 4px;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text);
}

.auto-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

/* Badges with subtle glow */
.badge {
  font-weight: 700;
  letter-spacing: 0.04em;
  font-size: 0.75rem;
  padding: 6px 12px;
  border-radius: 999px;
  transition: box-shadow var(--transition), transform 0.15s ease;
}

.badge:first-letter {
  text-transform: uppercase;
}

.badge-start {
  background: var(--ok-soft);
  color: #047857;
  border: 1px solid #a7f3d0;
  box-shadow: 0 0 0 1px rgba(5, 150, 105, 0.1);
}

.badge-start {
  animation: badge-glow-green 3s ease-in-out infinite;
}

@keyframes badge-glow-green {
  0%, 100% { box-shadow: 0 0 0 1px rgba(5, 150, 105, 0.1); }
  50% { box-shadow: 0 0 12px var(--ok-glow), 0 0 0 1px rgba(5, 150, 105, 0.15); }
}

.badge-stop {
  background: var(--danger-soft);
  color: #b91c1c;
  border: 1px solid #fecaca;
  box-shadow: 0 0 0 1px rgba(220, 38, 38, 0.1);
}

.badge-unknown {
  background: var(--warn-soft);
  color: #92400e;
  border: 1px solid #fde68a;
}

.hidden {
  display: none;
}

@media (max-width: 960px) {
  .status-panel,
  .mode-panel,
  .control-panel {
    grid-column: span 12;
  }
}

@media (max-width: 680px) {
  .app-shell {
    padding: 20px 16px 48px;
  }

  .hero {
    flex-direction: column;
    align-items: flex-start;
    padding: 20px;
  }

  .button-row,
  .auto-actions {
    width: 100%;
  }

  .button-row .btn,
  .auto-actions .btn {
    flex: 1;
  }

  .countdown-ring {
    width: 140px;
  }
}