:root {
  color-scheme: dark;
  --bg: #101820;
  --panel: rgba(18, 30, 42, 0.9);
  --panel-strong: #192839;
  --ink: #f7faf8;
  --ink-muted: #aebbc2;
  --line: rgba(255, 255, 255, 0.14);
  --green: #4fd07f;
  --gold: #f2c85b;
  --blue: #61b4ff;
  --coral: #ff8066;
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 20% 8%, rgba(79, 208, 127, 0.18), transparent 32rem),
    linear-gradient(135deg, #101820 0%, #172536 46%, #1b2b2f 100%);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.challenge-shell {
  min-height: 100vh;
  padding: 18px;
}

.challenge-hero {
  display: grid;
  min-height: calc(100vh - 36px);
  grid-template-columns: minmax(0, 0.92fr) minmax(360px, 1.08fr);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-strong);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.32);
}

.challenge-photo {
  min-height: 100%;
  background:
    linear-gradient(180deg, rgba(16, 24, 32, 0.2), rgba(16, 24, 32, 0.86)),
    url("/running.webp") center / min(66vw, 560px) no-repeat,
    linear-gradient(150deg, #21384a 0%, #172536 48%, #162b24 100%);
}

.challenge-panel {
  display: flex;
  min-width: 0;
  flex-direction: column;
  justify-content: center;
  gap: 22px;
  padding: 36px;
  background: var(--panel);
  border-left: 1px solid var(--line);
}

.challenge-header {
  display: grid;
  gap: 8px;
}

.brand-link {
  width: fit-content;
  color: var(--green);
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0;
  text-decoration: none;
}

.brand-link:hover {
  color: var(--gold);
}

.challenge-kicker,
.metric-label,
.stat-label,
.challenge-footer p {
  margin: 0;
  color: var(--ink-muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1 {
  max-width: 11ch;
  margin: 0;
  color: var(--ink);
  font-size: 48px;
  line-height: 0.95;
  letter-spacing: 0;
}

.date-range {
  margin: 0;
  color: var(--blue);
  font-size: 16px;
  font-weight: 700;
}

.total-board {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 158px;
  align-items: center;
  gap: 18px;
}

.total-copy {
  min-width: 0;
}

.total-mileage {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 2px 0 0;
  color: var(--green);
  font-size: 78px;
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: 0;
}

.unit {
  color: var(--ink-muted);
  font-size: 22px;
  font-weight: 800;
}

.status-note {
  margin: 10px 0 0;
  color: var(--ink);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.35;
}

.progress-ring {
  --progress: 0deg;
  display: grid;
  width: 158px;
  aspect-ratio: 1;
  place-items: center;
  border-radius: 999px;
  background:
    radial-gradient(circle at center, var(--panel-strong) 0 57%, transparent 58%),
    conic-gradient(var(--green) var(--progress), rgba(255, 255, 255, 0.12) 0deg);
  border: 1px solid var(--line);
}

.progress-ring span {
  color: var(--ink);
  font-size: 28px;
  font-weight: 900;
}

.progress-track {
  height: 14px;
  overflow: hidden;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid var(--line);
}

.progress-track span {
  display: block;
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--green), var(--gold));
  transition: width 0.28s ease;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.stat-card {
  display: grid;
  min-width: 0;
  gap: 5px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.06);
}

.stat-card strong {
  overflow: hidden;
  color: var(--ink);
  font-size: 28px;
  line-height: 1;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.stat-card span:last-child {
  color: var(--ink-muted);
  font-size: 13px;
  font-weight: 700;
}

.challenge-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px 16px;
  padding-top: 4px;
}

#data-status {
  color: var(--gold);
}

.challenge-shell[data-loading="false"] #data-status {
  color: var(--green);
}

.challenge-shell[data-error="true"] #data-status {
  color: var(--coral);
}

@media (max-width: 780px) {
  .challenge-shell {
    padding: 12px;
  }

  .challenge-hero {
    min-height: calc(100vh - 24px);
    grid-template-columns: 1fr;
  }

  .challenge-photo {
    min-height: 176px;
    background-size: auto, 240px, auto;
  }

  .challenge-panel {
    justify-content: start;
    padding: 24px;
    border-left: none;
    border-top: 1px solid var(--line);
  }

  h1 {
    max-width: 12ch;
    font-size: 38px;
  }

  .total-board {
    grid-template-columns: 1fr;
  }

  .progress-ring {
    width: 132px;
  }

  .total-mileage {
    font-size: 56px;
  }

  .stat-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 390px) {
  .challenge-panel {
    padding: 20px;
  }

  h1 {
    font-size: 34px;
  }

  .total-mileage {
    font-size: 50px;
  }
}