@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #0a0e1a;
  --surface: #131829;
  --border: rgba(255, 255, 255, 0.06);
  --text: #e2e8f0;
  --text-dim: #64748b;
  --blue: #3b82f6;
  --cyan: #06b6d4;
  --green: #22c55e;
  --red: #ef4444;
  --orange: #f59e0b;
}

body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  overflow: hidden;
}

.container {
  width: 100%;
  max-width: 380px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

h1 {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-dim);
}

/* ── Progress Ring ── */
.ring-wrapper {
  position: relative;
  width: 260px;
  height: 260px;
}

.ring-svg {
  width: 100%;
  height: 100%;
  transform: rotate(-90deg);
}

.ring-bg {
  fill: none;
  stroke: var(--border);
  stroke-width: 8;
}

.ring-fg {
  fill: none;
  stroke: url(#grad);
  stroke-width: 8;
  stroke-linecap: round;
  transition: stroke-dashoffset 0.4s ease;
}

.ring-center {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.3rem;
}

.countdown {
  font-size: 3.2rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.countdown.idle {
  font-size: 1.6rem;
  background: none;
  -webkit-text-fill-color: var(--text-dim);
}

.countdown-label {
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

/* ── Status Badge ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.4rem;
  border-radius: 100px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border: 1px solid var(--border);
  background: var(--surface);
}

.badge .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.badge.running .dot {
  background: var(--cyan);
  box-shadow: 0 0 8px var(--cyan);
  animation: pulse-dot 1.5s ease-in-out infinite;
}

.badge.open .dot {
  background: var(--green);
  box-shadow: 0 0 8px var(--green);
}

.badge.closed .dot {
  background: var(--red);
  box-shadow: 0 0 6px var(--red);
}

.badge.counting .dot {
  background: var(--orange);
  box-shadow: 0 0 8px var(--orange);
  animation: pulse-dot 0.8s ease-in-out infinite;
}

@keyframes pulse-dot {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.4;
  }
}

/* ── Info row ── */
.info {
  display: flex;
  gap: 1.5rem;
}

.info-item {
  text-align: center;
}

.info-value {
  font-size: 1.3rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

.info-label {
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 0.15rem;
}

/* ── Glow effect behind ring ── */
.glow {
  position: absolute;
  inset: 20px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.12) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.6s ease;
  pointer-events: none;
}

.glow.active {
  opacity: 1;
}

/* ── Controls ── */
.controls {
  display: flex;
  gap: 0.6rem;
  width: 100%;
  justify-content: center;
  flex-wrap: wrap;
}

.run-container {
  display: flex;
  width: 100%;
  gap: 0.6rem;
}

#btn-run {
  flex-grow: 1;
  font-size: 1.4rem;
  padding: 1.2rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.65rem 1.2rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.btn:hover {
  background: rgba(59, 130, 246, 0.12);
  border-color: var(--blue);
}

.btn:active {
  transform: scale(0.96);
}

.btn.primary {
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  border-color: transparent;
  color: #fff;
}

.btn.primary:hover {
  filter: brightness(1.15);
  background: linear-gradient(135deg, var(--blue), var(--cyan));
}

.btn.danger {
  border-color: rgba(239, 68, 68, 0.3);
}

.btn.danger:hover {
  background: rgba(239, 68, 68, 0.15);
  border-color: var(--red);
}

.btn.warning {
  border-color: rgba(245, 158, 11, 0.35);
  color: var(--orange);
}

.btn.warning:hover {
  background: rgba(245, 158, 11, 0.15);
  border-color: var(--orange);
}

.btn.warning.active-learn {
  background: var(--orange);
  border-color: transparent;
  color: #000;
  animation: pulse-dot 1s ease-in-out infinite;
}

.btn.success {
  border-color: rgba(34, 197, 94, 0.3);
}

.btn.success:hover {
  background: rgba(34, 197, 94, 0.15);
  border-color: var(--green);
}

.btn:disabled {
  opacity: 0.45;
  pointer-events: none;
}

.dur-input-group {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0 0.8rem;
  transition: border-color 0.15s ease;
}

.dur-input-group:focus-within {
  border-color: var(--blue);
}

.dur-input {
  width: 64px;
  background: transparent;
  border: none;
  color: var(--text);
  font-family: inherit;
  font-size: 1.2rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  padding: 0.8rem 0;
  outline: none;
  text-align: right;
}

.dur-input::-webkit-inner-spin-button {
  opacity: 0.3;
}

.dur-unit {
  font-size: 0.85rem;
  color: var(--text-dim);
  font-weight: 500;
}

/* ── Device Status Widgets ── */
.devices-row {
  display: flex;
  gap: 0.6rem;
  width: 100%;
}

.device-status {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 0.7rem 1.2rem;
  width: 100%;
}

.device-icon-wrap {
  position: relative;
  flex-shrink: 0;
}

.device-icon {
  width: 48px;
  height: 48px;
  object-fit: contain;
  border-radius: 10px;
  display: block;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.5));
}

.device-dot {
  position: absolute;
  bottom: -3px;
  right: -3px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 2px solid var(--bg);
  background: var(--text-dim);
  transition: background 0.4s ease, box-shadow 0.4s ease;
}

.device-dot.online {
  background: var(--green);
  box-shadow: 0 0 7px var(--green);
  animation: pulse-dot 2s ease-in-out infinite;
}

.device-dot.offline {
  background: var(--red);
  box-shadow: 0 0 6px var(--red);
}

.device-info {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.device-name {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}

.device-state {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  transition: color 0.4s ease;
}

.device-state.online {
  color: var(--green);
}

.device-state.offline {
  color: var(--red);
}

.device-desc {
  font-size: 0.68rem;
  color: var(--text-dim);
  line-height: 1.35;
  opacity: 0.75;
}