:root {
  --bg: #e8edef;
  --ink: #14263b;
  --muted: #61707e;
  --line: #13805d;
  --off: #aeb8c1;
  --alert: #b4402c;
  --station-fill: #ffffff;

  --rail: 3.25rem;
  --track: 6px;
  --dot: 1.25rem;

  --sans: "Avenir Next", "Avenir", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16202a;
    --ink: #e3e9ee;
    --muted: #93a1ae;
    --line: #39b98a;
    --off: #4a5765;
    --alert: #f07a62;
    --station-fill: #16202a;
  }
}

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

html {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 100%;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
}

.page {
  max-width: 44rem;
  margin: 0 auto;
  padding: clamp(2.5rem, 8vw, 5.5rem) 1.25rem 3rem;
}

/* 起点站：域名本身就是线路的起点 */
.terminus {
  position: relative;
  padding-left: var(--rail);
  padding-bottom: 1.25rem;
}

.terminus::after {
  content: "";
  position: absolute;
  left: calc(var(--rail) / 2 - var(--track) / 2);
  top: 1.5rem;
  bottom: 0;
  width: var(--track);
  background: var(--line);
}

.terminus::before {
  content: "";
  position: absolute;
  z-index: 1;
  left: calc(var(--rail) / 2 - 0.75rem);
  top: 0.15em;
  width: 1.5rem;
  height: clamp(2.6rem, 8.5vw, 5.4rem);
  border-radius: 0.75rem;
  background: var(--line);
}

.domain {
  margin: 0;
  font-size: clamp(3rem, 11vw, 6.75rem);
  font-weight: 600;
  line-height: 0.95;
  letter-spacing: -0.04em;
}

.summary-row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 1rem;
  margin-top: 1.25rem;
}

.summary {
  margin: 0;
  font-size: 1.0625rem;
  color: var(--muted);
}

.recheck {
  font: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--line);
  background: none;
  border: 0;
  padding: 0.125rem 0;
  cursor: pointer;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.25em;
}

.recheck:disabled {
  color: var(--muted);
  cursor: progress;
  text-decoration: none;
}

/* 线路：所有服务挂在同一条隧道上 */
.line {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 1.5rem;
}

.line::before {
  content: "";
  position: absolute;
  left: calc(var(--rail) / 2 - var(--track) / 2);
  top: 0;
  bottom: 0;
  width: var(--track);
  border-radius: 0 0 var(--track) var(--track);
  background: var(--line);
  transform-origin: top;
  animation: draw 700ms cubic-bezier(0.3, 0.7, 0.2, 1) both;
}

@keyframes draw {
  from { transform: scaleY(0); }
}

.stop {
  display: grid;
  grid-template-columns: var(--rail) 1fr auto;
  align-items: center;
  column-gap: 0;
  padding: 1.125rem 0;
  color: inherit;
  text-decoration: none;
  border-radius: 0.5rem;
}

.stop::before {
  content: "";
  grid-column: 1;
  justify-self: center;
  position: relative;
  width: var(--dot);
  height: var(--dot);
  border-radius: 50%;
  background: var(--station-fill);
  border: 4px solid var(--off);
  transition: border-color 240ms ease, background-color 240ms ease, transform 240ms ease;
  transition-delay: calc(var(--i, 0) * 70ms);
}

.stop[data-state="up"]::before {
  border-color: var(--line);
}

.stop[data-state="down"]::before {
  border-color: var(--off);
  transform: scale(0.8);
}

.stop:focus-visible {
  outline: 2px solid var(--line);
  outline-offset: 2px;
}

.stop-name {
  margin: 0;
  font-size: 1.375rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.stop:hover .stop-name {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 0.2em;
}

.stop-meta {
  margin: 0.125rem 0 0;
  font-size: 0.875rem;
  color: var(--muted);
}

.stop-status {
  text-align: right;
  padding-left: 1rem;
  font-variant-numeric: tabular-nums;
}

.stop-state {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
}

.stop-detail {
  display: block;
  font-size: 0.8125rem;
  color: var(--muted);
}

.stop[data-state="up"] .stop-state {
  color: var(--line);
}

.stop[data-state="down"] .stop-state {
  color: var(--alert);
}

.stop[data-state="down"] .stop-name {
  color: var(--muted);
}

.stop[data-state="pending"] .stop-state {
  color: var(--muted);
  font-weight: 400;
}

.footnote {
  padding-left: var(--rail);
  font-size: 0.8125rem;
  color: var(--muted);
}

.footnote p {
  margin: 0;
}

@media (max-width: 30rem) {
  :root {
    --rail: 2.5rem;
  }

  .stop {
    grid-template-columns: var(--rail) 1fr;
  }

  .stop-status {
    grid-column: 2;
    text-align: left;
    padding-left: 0;
    margin-top: 0.375rem;
  }

  .stop-state,
  .stop-detail {
    display: inline;
  }

  .stop-detail:not(:empty)::before {
    content: "，";
  }
}

@media (prefers-reduced-motion: reduce) {
  .line::before {
    animation: none;
  }

  .stop::before {
    transition: none;
  }
}