:root {
  --enamel: #e8f0ec;
  --enamel-2: #d5e4de;
  --mint: #7eb8a8;
  --mint-deep: #4e8a7c;
  --brass: #c4a35a;
  --ink: #24302c;
  --mute: #5c6e68;
  --late: #c45c32;
  --ok: #3d7a62;
  --display: "Manrope", "Noto Sans SC", sans-serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

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

html {
  scroll-behavior: smooth;
}

section[id] {
  scroll-margin-top: 88px;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--enamel);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

.app-link {
  color: var(--mint-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

button {
  font-family: inherit;
  cursor: pointer;
}

code {
  font-family: var(--mono);
  background: rgba(126, 184, 168, 0.2);
  padding: 0.05em 0.35em;
}

.enamel-sill {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 1;
  opacity: 0.22;
  background-image:
    url("images/texture.webp"),
    repeating-conic-gradient(#dfe8e4 0% 25%, transparent 0% 50%);
  background-size: 240px auto, 28px 28px;
}

.skip {
  position: absolute;
  left: -999px;
}

.skip:focus {
  left: 12px;
  top: 12px;
  z-index: 40;
  background: #fff;
  padding: 0.4rem 0.8rem;
}

.drum-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.65rem 1.2rem;
  background: rgba(232, 240, 236, 0.94);
  border-bottom: 3px solid var(--mint);
  backdrop-filter: blur(8px);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--display);
  font-weight: 800;
}

.brand small {
  display: block;
  font-family: var(--mono);
  font-size: 0.64rem;
  font-weight: 500;
  color: var(--mute);
  letter-spacing: 0.1em;
}

.drum-ring {
  width: 1.7rem;
  height: 1.7rem;
  border: 4px solid var(--mint);
  border-radius: 50%;
  box-shadow: inset 0 0 0 4px var(--brass);
}

.nav-toggle {
  margin-left: auto;
  background: var(--brass);
  border: 0;
  color: var(--ink);
  padding: 0.3rem 0.7rem;
  font-family: var(--display);
  font-weight: 700;
}

.drum-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.2rem 0.95rem;
  font-size: 0.92rem;
}

.drum-nav a.is-active {
  color: var(--mint-deep);
}

.drum-nav .live {
  background: var(--mint-deep);
  color: #fff;
  padding: 0.2rem 0.65rem;
}

main {
  position: relative;
  z-index: 2;
}

.hero figure {
  margin: 0;
}

.hero img {
  width: 100%;
  height: min(52vh, 480px);
  object-fit: cover;
}

.hero-copy {
  width: min(1040px, calc(100% - 2rem));
  margin: -2.5rem auto 0;
  background: #f4faf7;
  border: 1px solid var(--enamel-2);
  padding: 1.7rem 1.4rem 1.9rem;
}

.kicker {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--mint-deep);
  margin: 0 0 0.5rem;
}

h1,
h2,
h3 {
  font-family: var(--display);
  line-height: 1.15;
  margin: 0 0 0.65rem;
}

h1 {
  font-size: clamp(2rem, 5vw, 3.15rem);
  font-weight: 800;
}

.lead {
  max-width: 74ch;
  margin: 0 0 1rem;
}

.chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.chip {
  font-family: var(--mono);
  font-size: 0.74rem;
  border: 1px solid var(--mint);
  padding: 0.12rem 0.45rem;
}

.chip.warn {
  background: var(--brass);
  border-color: var(--brass);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn {
  display: inline-block;
  padding: 0.5rem 0.9rem;
  font-family: var(--display);
  font-weight: 700;
  border: 1px solid var(--ink);
}

.btn-fill {
  background: var(--mint-deep);
  color: #fff;
  border-color: var(--mint-deep);
}

.bay {
  width: min(1040px, calc(100% - 2rem));
  margin: 0 auto;
  padding: 3rem 0;
}

.bay-head {
  margin-bottom: 1.6rem;
}

.vlabel {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--mint-deep);
  margin: 0 0 0.35rem;
  white-space: nowrap;
}

.bay-head h2 {
  font-size: clamp(1.45rem, 3vw, 2.05rem);
}

.bay-head p {
  margin: 0;
  color: var(--mute);
}

.three-drum {
  display: grid;
  gap: 0.8rem;
}

.three-drum article {
  background: #fff;
  padding: 1rem 1.05rem;
  border-top: 6px solid var(--mint);
}

.three-drum ul {
  margin: 0;
  padding-left: 1.1rem;
}

.brass-band {
  background: rgba(196, 163, 90, 0.1);
  border-block: 1px solid var(--enamel-2);
}

.leg {
  display: grid;
  gap: 1.1rem;
  margin-bottom: 2.1rem;
  align-items: center;
}

.leg figure {
  margin: 0;
}

.leg img {
  width: 100%;
  border: 6px solid var(--mint);
}

.leg figcaption {
  font-size: 0.84rem;
  color: var(--mute);
  padding-top: 0.35rem;
}

.idx {
  font-family: var(--mono);
  font-size: 0.74rem;
  color: var(--mint-deep);
}

.dial {
  margin-top: 0.9rem;
  padding: 0.8rem;
  border: 1px dashed var(--brass);
  background: #fff;
}

.dial-label {
  margin: 0 0 0.4rem;
  font-size: 0.85rem;
  color: var(--mute);
}

.slider {
  display: grid;
  grid-template-columns: 1.6rem 1fr 4rem;
  gap: 0.5rem;
  align-items: center;
  font-family: var(--mono);
  font-size: 0.8rem;
}

.slider input {
  width: 100%;
  accent-color: var(--brass);
}

.tri-state {
  margin: 0.5rem 0 0;
  font-weight: 600;
}

.tri-state.ok {
  color: var(--ok);
}

.tri-state.warn {
  color: var(--brass);
}

.tri-state.late {
  color: var(--late);
}

.route-board {
  display: grid;
  background: #fff;
  border: 1px solid var(--enamel-2);
}

.route-head,
.route-row {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr 0.8fr 1.2fr;
  gap: 0.35rem;
  padding: 0.55rem 0.7rem;
  font-family: var(--mono);
  font-size: 0.82rem;
}

.route-head {
  background: var(--mint-deep);
  color: #fff;
}

.route-row {
  border-top: 1px solid var(--enamel-2);
}

.route-row.late {
  color: var(--late);
}

.rule-list {
  margin: 0;
  padding-left: 1.2rem;
}

.rule-list li {
  margin-bottom: 0.4rem;
}

.io {
  display: grid;
  gap: 1rem;
}

.io div {
  background: #fff;
  padding: 1rem;
  border-left: 6px solid var(--brass);
}

footer {
  position: relative;
  z-index: 2;
  padding: 1.3rem;
  text-align: center;
  font-size: 0.85rem;
  color: var(--mute);
  border-top: 3px solid var(--mint);
}

@media (min-width: 860px) {
  .hero-copy {
    padding: 2.1rem 2rem;
  }

  .three-drum {
    grid-template-columns: repeat(3, 1fr);
  }

  .leg {
    grid-template-columns: 1.1fr 0.9fr;
  }

  .leg.rev {
    grid-template-columns: 0.9fr 1.1fr;
  }

  .leg.rev > div {
    order: 2;
  }

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

  .nav-toggle {
    display: none;
  }
}

@media (max-width: 859px) {
  .route-head,
  .route-row {
    grid-template-columns: 1fr 1fr;
  }

  .drum-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--enamel);
    border-bottom: 3px solid var(--mint);
    padding: 0.8rem 1.1rem 1rem;
    flex-direction: column;
  }

  .drum-nav.open {
    display: flex;
  }

  .drum-bar {
    flex-wrap: wrap;
  }
}