:root {
  color-scheme: dark;
  --bg: #0b0d10;
  --bg-soft: #10141a;
  --panel: #0f141a;
  --panel-edge: #1e252c;
  --line: #1b2128;
  --fg: #f2f4f7;
  --muted: #9ba3aa;
  --accent: #67d4ff;
  --accent-soft: rgba(103, 212, 255, 0.18);
  --accent-strong: rgba(103, 212, 255, 0.55);
  --danger: rgba(255, 123, 123, 0.4);
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(1200px 800px at 10% -20%, #16212c 0%, rgba(11, 13, 16, 0.92) 45%, #0b0d10 85%);
  color: var(--fg);
  font-family: ui-sans-serif, system-ui, -apple-system, "Helvetica Neue", Helvetica, Arial, sans-serif;
  letter-spacing: -0.01em;
}

.app {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px 48px;
}

.top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

h1 {
  margin: 0;
  font-size: clamp(2.2rem, 4.5vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.setup {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.segmented {
  display: inline-flex;
  background: #0f1318;
  border-radius: 999px;
  border: 1px solid #1c232a;
  padding: 4px;
  gap: 4px;
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.02);
}

.segmented button {
  border: none;
  background: transparent;
  color: var(--muted);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  transition: all 220ms var(--ease);
  cursor: pointer;
}

.segmented button[aria-pressed="true"] {
  color: var(--fg);
  background: linear-gradient(180deg, #1a2631 0%, #0f141a 100%);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4), inset 0 0 0 1px rgba(103, 212, 255, 0.25);
}

.segmented button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px rgba(103, 212, 255, 0.35);
}

.goal-input {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 12px;
}

.goal-input span {
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}

input[type="text"] {
  background: transparent;
  border: none;
  color: var(--fg);
  font-size: 1rem;
  letter-spacing: 0.02em;
  width: 110px;
}

input[type="text"]:focus {
  outline: none;
}

input[type="text"].invalid {
  color: #ffb0b0;
}

.timeline {
  position: relative;
  height: 260px;
  margin: 38px 0 24px;
  --spread: 28%;
}

.track {
  position: absolute;
  top: 50%;
  left: 6%;
  right: 6%;
  height: 2px;
  background: linear-gradient(90deg, rgba(103, 212, 255, 0.18), #1b2128, rgba(103, 212, 255, 0.18));
  box-shadow: 0 0 12px rgba(103, 212, 255, 0.1);
  transform: translateY(-50%);
  transition: box-shadow 240ms var(--ease);
}

.mark-group {
  position: absolute;
  top: 50%;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: left 260ms var(--ease), transform 260ms var(--ease);
}

.mark-group.below {
  left: calc(50% - var(--spread));
}

.mark-group.goal {
  left: 50%;
  z-index: 2;
}

.mark-group.above {
  left: calc(50% + var(--spread));
}

.mark {
  display: flex;
  align-items: center;
  gap: 10px;
}

.mark-group.above .mark {
  flex-direction: row-reverse;
  text-align: right;
}

.mark-group.goal .mark {
  flex-direction: column;
  gap: 8px;
  text-align: center;
}

.mark .dot {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #0b0d10;
  border: 1px solid rgba(103, 212, 255, 0.5);
  box-shadow: 0 0 14px rgba(103, 212, 255, 0.25), 0 6px 14px rgba(0, 0, 0, 0.45);
  transition: all 240ms var(--ease);
}

.mark.goal .dot {
  width: 18px;
  height: 18px;
  background: var(--accent);
  border: none;
  box-shadow: 0 0 20px rgba(103, 212, 255, 0.55), 0 6px 18px rgba(0, 0, 0, 0.5);
}

.mark .readout {
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  background: rgba(15, 20, 26, 0.85);
  border: 1px solid #1e252c;
  color: var(--fg);
  min-width: 72px;
  transition: all 240ms var(--ease);
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
}

.readout-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.readout-time {
  font-variant-numeric: tabular-nums;
}

.mark.goal .readout {
  background: rgba(103, 212, 255, 0.12);
  border-color: rgba(103, 212, 255, 0.3);
}

.controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-edge);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.28);
  display: grid;
  gap: 12px;
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel-title {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.panel-title-text {
  color: var(--muted);
}

.panel-distance {
  color: rgba(103, 212, 255, 0.75);
  letter-spacing: 0.14em;
}

.panel input[type="text"] {
  width: 120px;
  background: #0b0f14;
  border: 1px solid #212831;
  border-radius: 10px;
  padding: 8px 10px;
  font-size: 1rem;
}

.panel input[type="text"]:focus {
  border-color: rgba(103, 212, 255, 0.6);
  box-shadow: 0 0 0 2px rgba(103, 212, 255, 0.15);
}

.panel input[type="text"].invalid {
  border-color: rgba(255, 123, 123, 0.6);
  box-shadow: 0 0 0 2px rgba(255, 123, 123, 0.15);
}

.events-panel {
  grid-column: 1 / -1;
}

.events-grid {
  display: grid;
  gap: 10px;
}

.event-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 10px;
  border-radius: 12px;
  background: #0b0f14;
  border: 1px solid #1d242c;
}

.event-row.goal {
  border-color: rgba(103, 212, 255, 0.45);
  box-shadow: inset 0 0 0 1px rgba(103, 212, 255, 0.15);
}

.event-toggle {
  background: transparent;
  border: none;
  color: var(--fg);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  padding: 4px 0;
}

.event-toggle[aria-pressed="false"] {
  color: var(--muted);
}

.event-toggle:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px rgba(103, 212, 255, 0.35);
  border-radius: 8px;
}

.event-toggle:disabled {
  cursor: default;
  color: var(--fg);
}

.event-time {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--fg);
}

.event-time-input {
  width: 86px;
  text-align: right;
  background: transparent;
  border: 1px solid transparent;
  color: var(--fg);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  padding: 4px 6px;
  border-radius: 8px;
  transition: border-color 200ms var(--ease), box-shadow 200ms var(--ease), color 200ms var(--ease);
}

.event-time-input:focus {
  outline: none;
  border-color: rgba(103, 212, 255, 0.5);
  box-shadow: 0 0 0 2px rgba(103, 212, 255, 0.15);
}

.event-time-input.invalid {
  border-color: rgba(255, 123, 123, 0.55);
  box-shadow: 0 0 0 2px rgba(255, 123, 123, 0.15);
  color: #ffb0b0;
}

.event-row.inactive .event-time {
  color: var(--muted);
}

.event-row.inactive .event-time-input {
  color: var(--muted);
}

.range-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent-strong) var(--fill, 50%), #1c232a var(--fill, 50%));
  transition: background 200ms var(--ease);
}

input[type="range"]:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px rgba(103, 212, 255, 0.25);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #0b0f14;
  border: 1px solid rgba(103, 212, 255, 0.6);
  box-shadow: 0 0 12px rgba(103, 212, 255, 0.35), 0 4px 10px rgba(0, 0, 0, 0.5);
  transition: transform 200ms var(--ease);
}

input[type="range"]::-webkit-slider-thumb:active {
  transform: scale(1.08);
}

input[type="range"]::-moz-range-track {
  height: 6px;
  border-radius: 999px;
  background: #1c232a;
}

input[type="range"]::-moz-range-progress {
  height: 6px;
  border-radius: 999px;
  background: var(--accent-strong);
}

input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #0b0f14;
  border: 1px solid rgba(103, 212, 255, 0.6);
  box-shadow: 0 0 12px rgba(103, 212, 255, 0.35), 0 4px 10px rgba(0, 0, 0, 0.5);
}

.app.clamped .track {
  box-shadow: 0 0 16px rgba(103, 212, 255, 0.4);
}

@media (max-width: 900px) {
  .controls {
    grid-template-columns: 1fr;
  }

  .setup {
    justify-content: flex-start;
  }
}

@media (max-width: 720px) {
  .top {
    flex-direction: column;
    align-items: flex-start;
  }

  .timeline {
    height: 200px;
    margin: 28px 0 20px;
  }

  .timeline {
    height: 240px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
  }
}