:root {
  --fog: #d9dde4;
  --mist: #e8ebf1;
  --pearl: #f4f6fa;
  --ink: #2a313b;
  --ash: #5a6370;
  --steel: #4a5c73;
  --steel-soft: #6b7d94;
  --warn: #6d5734;
  --halt: #6a3c38;
  --dot-a: #5d7190;
  --dot-b: #6e7a58;
  --dot-c: #7a6550;
  --dot-d: #5a7370;
  --raise: 8px 8px 16px #c3c8d1, -7px -7px 16px #f7f9fc;
  --raise-sm: 4px 4px 9px #c6cbd4, -4px -4px 9px #f5f7fb;
  --press: inset 6px 6px 12px #c3c8d1, inset -5px -5px 12px #f7f9fc;
  --press-sm: inset 3px 3px 7px #c6cbd4, inset -3px -3px 7px #f5f7fb;
  --ring: 0 0 0 3px rgba(74, 92, 115, 0.28);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(900px 520px at 6% -8%, #eef1f6 0%, transparent 54%),
    radial-gradient(780px 440px at 96% 4%, #cfd5de 0%, transparent 48%),
    var(--fog);
  line-height: 1.65;
}

body.lane-lock {
  overflow: hidden;
}

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

a {
  color: var(--steel);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--ink);
}

a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}

.skip {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 40;
  padding: 8px 14px;
  border-radius: 999px;
  background: var(--mist);
  box-shadow: var(--raise-sm);
  color: var(--ink);
}

.skip:focus {
  top: 12px;
}

.shell {
  width: min(1120px, calc(100% - 32px));
  margin-inline: auto;
}

.chip-strip {
  padding: 14px 0 4px;
}

.chip-rail {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 999px;
  background: var(--mist);
  box-shadow: var(--press-sm);
}

.capsule {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px 5px 8px;
  border-radius: 999px;
  background: var(--fog);
  box-shadow: var(--raise-sm);
  color: var(--ash);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

.capsule.on {
  color: var(--ink);
  box-shadow: var(--press-sm);
}

.speck {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: inset 1px 1px 2px rgba(255, 255, 255, 0.7), 1px 1px 2px rgba(90, 99, 112, 0.25);
}

.speck.a { background: var(--dot-a); }
.speck.b { background: var(--dot-b); }
.speck.c { background: var(--dot-c); }
.speck.d { background: var(--dot-d); }

.dock {
  position: sticky;
  top: 10px;
  z-index: 20;
  margin: 10px 0 8px;
}

.dock-pin .dock-board {
  box-shadow: var(--raise-sm);
}

.dock-board {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 14px;
  border-radius: 28px;
  background: var(--mist);
  box-shadow: var(--raise);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
  min-width: 0;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  box-shadow: var(--raise-sm);
  object-fit: cover;
}

.brand strong {
  display: block;
  font-size: 0.98rem;
}

.brand small {
  display: block;
  color: var(--ash);
  font-size: 0.72rem;
}

.opener {
  display: none;
  border: 0;
  background: var(--fog);
  color: var(--ink);
  border-radius: 999px;
  padding: 8px 14px;
  box-shadow: var(--raise-sm);
  cursor: pointer;
}

.opener:active {
  box-shadow: var(--press-sm);
}

.lane {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px;
  border-radius: 999px;
  background: var(--fog);
  box-shadow: var(--press-sm);
}

.lane a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--ash);
  text-decoration: none;
  font-size: 0.9rem;
}

.lane a:hover,
.lane a[aria-current="page"] {
  color: var(--ink);
  background: var(--mist);
  box-shadow: var(--raise-sm);
}

.lane a.cta {
  background: var(--mist);
  color: var(--ink);
  box-shadow: var(--raise-sm);
  font-weight: 600;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: 28px;
  align-items: center;
  padding: 36px 0 20px;
}

.hero h1 {
  margin: 12px 0 10px;
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.lead {
  margin: 0 0 18px;
  color: var(--ash);
  font-size: 1.02rem;
}

.acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 22px;
}

.rise,
.sink {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
}

.rise {
  background: var(--mist);
  color: var(--ink);
  box-shadow: var(--raise);
}

.rise:hover {
  color: var(--ink);
}

.rise:active {
  box-shadow: var(--press);
}

.sink {
  background: var(--fog);
  color: var(--steel);
  box-shadow: var(--press-sm);
}

.sink:hover {
  color: var(--ink);
}

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

.gauge {
  padding: 12px 14px;
  border-radius: 18px;
  background: var(--mist);
  box-shadow: var(--raise-sm);
}

.gauge b {
  display: block;
  font-size: 1.05rem;
}

.gauge span {
  color: var(--ash);
  font-size: 0.8rem;
}

.recess {
  padding: 14px;
  border-radius: 28px;
  background: var(--fog);
  box-shadow: var(--press);
}

.recess img {
  width: 100%;
  border-radius: 20px;
  box-shadow: var(--raise-sm);
}

.recess figcaption {
  margin-top: 10px;
  color: var(--ash);
  font-size: 0.82rem;
  text-align: center;
}

.notice {
  padding: 14px 16px;
  border-radius: 18px;
  background: var(--mist);
  box-shadow: var(--raise-sm);
  margin: 0 0 16px;
}

.notice.warn {
  color: var(--warn);
}

.notice.halt {
  color: var(--halt);
}

.notice h3 {
  margin: 0 0 6px;
  font-size: 0.95rem;
}

.notice p {
  margin: 0;
  color: var(--ash);
}

.block {
  padding: 28px 0;
}

.block h2 {
  margin: 0 0 8px;
  font-size: 1.45rem;
}

.block > p,
.intro {
  margin: 0 0 16px;
  color: var(--ash);
}

.gates {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.gate,
.folio,
.slab {
  padding: 16px 16px 18px;
  border-radius: 22px;
  background: var(--mist);
  box-shadow: var(--raise);
}

.gate h3,
.folio h3,
.slab h3 {
  margin: 8px 0 6px;
  font-size: 1.02rem;
}

.gate p,
.folio p,
.slab p {
  margin: 0;
  color: var(--ash);
  font-size: 0.92rem;
}

.quad {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

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

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.crumb {
  margin: 0 0 10px;
  color: var(--ash);
  font-size: 0.86rem;
}

.table-hold {
  overflow-x: auto;
  border-radius: 18px;
  background: var(--fog);
  box-shadow: var(--press-sm);
  padding: 8px;
  margin: 14px 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

th,
td {
  text-align: left;
  padding: 10px 12px;
  vertical-align: top;
}

th {
  color: var(--ash);
  font-weight: 600;
}

tbody tr:nth-child(odd) {
  background: rgba(244, 246, 250, 0.55);
}

code {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 0.86em;
}

.note-well {
  margin: 16px 0 0;
  padding: 14px 16px;
  border-radius: 18px;
  background: var(--fog);
  box-shadow: var(--press);
}

.note-well header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--ash);
  font-size: 0.8rem;
  margin-bottom: 8px;
}

.note-well pre {
  margin: 0;
  white-space: pre-wrap;
  color: var(--ink);
  font-size: 0.86rem;
}

.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: chip-step;
}

.steps li {
  counter-increment: chip-step;
  position: relative;
  padding: 14px 16px 14px 52px;
  margin-bottom: 10px;
  border-radius: 18px;
  background: var(--mist);
  box-shadow: var(--raise-sm);
}

.steps li::before {
  content: counter(chip-step);
  position: absolute;
  left: 14px;
  top: 16px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--fog);
  box-shadow: var(--press-sm);
  font-size: 0.8rem;
  font-weight: 700;
}

.steps h3 {
  margin: 0 0 4px;
  font-size: 1rem;
}

.steps p {
  margin: 0;
  color: var(--ash);
}

.faq-fold {
  margin-bottom: 10px;
  border-radius: 18px;
  background: var(--mist);
  box-shadow: var(--raise-sm);
  padding: 4px 16px 4px;
}

.faq-fold summary {
  cursor: pointer;
  list-style: none;
  padding: 12px 0;
  font-weight: 600;
}

.faq-fold summary::-webkit-details-marker {
  display: none;
}

.faq-fold summary::after {
  content: "";
  float: right;
  width: 10px;
  height: 10px;
  margin-top: 6px;
  border-radius: 50%;
  background: var(--dot-a);
  box-shadow: var(--raise-sm);
}

.faq-fold[open] summary::after {
  background: var(--dot-b);
  box-shadow: var(--press-sm);
}

.faq-fold p {
  margin: 0 0 14px;
  color: var(--ash);
}

.base {
  margin-top: 28px;
  padding: 28px 0 20px;
}

.base-board {
  padding: 24px;
  border-radius: 28px;
  background: var(--mist);
  box-shadow: var(--raise);
}

.base-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.9fr 0.9fr 1.1fr;
  gap: 22px;
}

.base h3 {
  margin: 0 0 10px;
  font-size: 0.95rem;
}

.base ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.base li {
  margin-bottom: 6px;
}

.base p {
  color: var(--ash);
  font-size: 0.9rem;
}

.legal {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 8px;
  margin-top: 18px;
  padding-top: 14px;
  color: var(--ash);
  font-size: 0.82rem;
  box-shadow: inset 0 1px 0 rgba(90, 99, 112, 0.12);
}

@media (max-width: 980px) {
  .hero,
  .split,
  .pair,
  .gates,
  .quad,
  .base-grid {
    grid-template-columns: 1fr 1fr;
  }

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

@media (max-width: 760px) {
  .opener {
    display: inline-flex;
  }

  .lane {
    display: none;
    position: absolute;
    right: 16px;
    top: calc(100% + 8px);
    flex-direction: column;
    align-items: stretch;
    width: min(280px, calc(100vw - 40px));
    padding: 10px;
    border-radius: 22px;
    box-shadow: var(--raise);
    background: var(--mist);
  }

  .lane.lane-open {
    display: flex;
  }

  .dock {
    position: sticky;
  }

  .dock-board {
    position: relative;
  }

  .hero,
  .split,
  .pair,
  .gates,
  .quad,
  .base-grid,
  .gauges {
    grid-template-columns: 1fr;
  }

  .chip-rail {
    border-radius: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}