:root {
  --wash: #c8d3e2;
  --ink: #2a3648;
  --fade: #5a687c;
  --hint: #7b8aa0;
  --steel: #2b5a86;
  --steel-ink: #163a5c;
  --ok: #2c6b55;
  --warn: #8a6418;
  --halt: #944646;
  --hi: #e8eef6;
  --lo: #a4b2c4;
  --line: #b4c0d0;
  --cut: 8px;
  --cut-s: 6px;
  --bar: 4px 6px 10px var(--lo), -3px -4px 8px var(--hi);
  --bar-s: 3px 4px 7px var(--lo), -2px -3px 6px var(--hi);
  --slot: inset 4px 5px 9px var(--lo), inset -3px -3px 7px var(--hi);
  --slot-s: inset 3px 3px 6px var(--lo), inset -2px -2px 5px var(--hi);
  --ring: 0 0 0 3px rgba(43, 90, 134, 0.32);
  --wide: 1040px;
}

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

html {
  scroll-behavior: smooth;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--wash);
  background-image: repeating-linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.08) 0 1px,
    transparent 1px 28px
  );
  color: var(--ink);
  line-height: 1.65;
}

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

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

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

:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}

.jump {
  position: absolute;
  left: 12px;
  top: -48px;
  z-index: 80;
  padding: 0.45rem 0.85rem;
  background: var(--wash);
  box-shadow: var(--bar);
  border-radius: var(--cut-s);
  color: var(--ink);
}

.jump:focus {
  top: 12px;
}

.wrap {
  width: min(var(--wide), calc(100% - 32px));
  margin: 0 auto;
}

.mast {
  position: sticky;
  top: 0;
  z-index: 40;
  background: var(--wash);
}

.mast.is-hold {
  box-shadow: 0 1px 0 var(--line);
}

.mast-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 68px;
}

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

.wordmark img {
  width: 36px;
  height: 36px;
  border-radius: var(--cut-s);
  box-shadow: var(--bar-s);
  object-fit: cover;
}

.wordmark strong {
  display: block;
  font-size: 0.98rem;
  letter-spacing: 0.01em;
}

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

.fold-btn {
  display: none;
  border: 0;
  background: var(--wash);
  color: var(--ink);
  box-shadow: var(--bar-s);
  border-radius: var(--cut-s);
  padding: 0.45rem 0.8rem;
  font: inherit;
  cursor: pointer;
}

.fold-btn:active {
  box-shadow: var(--slot-s);
}

.nav-row ul {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-row a {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 0.75rem;
  border-radius: var(--cut-s);
  color: var(--ink);
  text-decoration: none;
  font-size: 0.92rem;
}

.nav-row a:hover,
.nav-row a[aria-current="page"] {
  box-shadow: var(--slot-s);
}

.knob {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
  padding: 0 1.05rem;
  border-radius: var(--cut-s);
  background: var(--wash);
  box-shadow: var(--bar);
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.92rem;
}

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

.knob:active {
  box-shadow: var(--slot);
}

.knob-fill {
  color: #f4f8fc;
  background: linear-gradient(180deg, #3b6d9a 0%, var(--steel) 100%);
  box-shadow: 4px 6px 10px var(--lo), inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.knob-fill:hover {
  color: #fff;
}

.act {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 1.1rem 0 0;
}

.hero {
  padding: 1.6rem 0 0.4rem;
}

.hero-board {
  display: grid;
  gap: 1.2rem;
  padding: 1.15rem 1.2rem 1.25rem;
  background: var(--wash);
  box-shadow: var(--bar);
  border-radius: var(--cut);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  min-height: 28px;
  padding: 0 0.7rem;
  border-radius: var(--cut-s);
  box-shadow: var(--slot-s);
  color: var(--fade);
  font-size: 0.78rem;
}

.chip.is-on {
  color: var(--steel-ink);
}

.chip i {
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--steel);
}

.kicker {
  margin: 0.7rem 0 0.2rem;
  color: var(--hint);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0 0 0.45rem;
  line-height: 1.28;
  font-weight: 700;
}

h1 {
  font-size: clamp(1.7rem, 3vw, 2.25rem);
}

h2 {
  font-size: clamp(1.28rem, 2.2vw, 1.6rem);
}

h3 {
  font-size: 1.02rem;
}

.lead,
.prose {
  margin: 0 0 0.7rem;
  color: var(--fade);
}

.alert {
  margin: 0.85rem 0;
  padding: 0.7rem 0.85rem;
  border-radius: var(--cut-s);
  box-shadow: var(--slot);
}

.alert h3 {
  color: var(--steel-ink);
}

.alert p {
  margin: 0;
  color: var(--fade);
  font-size: 0.92rem;
}

.crumb {
  margin: 0 0 0.55rem;
  color: var(--hint);
  font-size: 0.82rem;
}

.crumb a {
  color: inherit;
}

.slot-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin-top: 1.15rem;
}

.slot {
  display: grid;
  grid-template-columns: 5.6rem 1fr;
  min-height: 52px;
  border-radius: var(--cut-s);
  background: var(--wash);
  box-shadow: var(--slot);
  overflow: hidden;
}

.slot span {
  display: flex;
  align-items: center;
  padding: 0 0.65rem;
  color: var(--fade);
  font-size: 0.75rem;
  border-right: 1px solid var(--line);
}

.slot b {
  display: flex;
  align-items: center;
  padding: 0 0.75rem;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}

.slot small {
  display: block;
  font-weight: 400;
  color: var(--hint);
  font-size: 0.7rem;
}

.hero-pic {
  margin: 0;
}

.hero-pic img,
.trough img {
  width: 100%;
  border-radius: var(--cut);
  box-shadow: var(--slot);
}

.hero-pic figcaption,
.trough figcaption {
  margin-top: 0.45rem;
  color: var(--hint);
  font-size: 0.78rem;
}

.block {
  padding: 1.55rem 0;
}

.panel {
  padding: 1rem 1.05rem 1.15rem;
  background: var(--wash);
  box-shadow: var(--bar);
  border-radius: var(--cut);
}

.entry-row,
.strip-list,
.os-row {
  display: grid;
  gap: 10px;
  margin-top: 0.9rem;
}

.entry-row {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.strip-list {
  grid-template-columns: 1fr;
}

.os-row {
  grid-template-columns: 1fr;
}

.entry,
.strip,
.os-bar {
  display: grid;
  grid-template-columns: 48px 1fr auto;
  align-items: center;
  gap: 12px;
  min-height: 72px;
  padding: 0.55rem 0.8rem;
  border-radius: var(--cut-s);
  background: var(--wash);
  box-shadow: var(--bar-s);
  text-decoration: none;
  color: inherit;
}

.strip,
.os-bar {
  grid-template-columns: 48px 1fr;
}

.os-bar {
  grid-template-columns: 48px 1fr auto;
}

.entry b,
.strip h3,
.os-bar h3 {
  margin: 0;
  font-size: 0.98rem;
}

.entry span,
.strip p,
.os-bar p {
  margin: 0.12rem 0 0;
  color: var(--fade);
  font-size: 0.84rem;
}

.mark {
  width: 40px;
  height: 40px;
  border-radius: var(--cut-s);
  box-shadow: var(--slot-s);
  position: relative;
}

.mark::before,
.mark::after {
  content: "";
  position: absolute;
  background: var(--steel);
}

.g-web::before {
  inset: 12px 10px 12px 10px;
  border-radius: 2px;
  box-shadow: 0 6px 0 -2px var(--steel);
  background: transparent;
  border: 2px solid var(--steel);
}

.g-web::after {
  width: 10px;
  height: 2px;
  left: 15px;
  top: 13px;
}

.g-dl::before {
  width: 14px;
  height: 2px;
  left: 13px;
  top: 26px;
}

.g-dl::after {
  width: 2px;
  height: 14px;
  left: 19px;
  top: 10px;
  box-shadow: 4px 8px 0 -1px var(--steel), -4px 8px 0 -1px var(--steel);
}

.g-pc::before {
  inset: 10px 8px 16px 8px;
  border: 2px solid var(--steel);
  background: transparent;
  border-radius: 2px;
}

.g-pc::after {
  width: 16px;
  height: 2px;
  left: 12px;
  bottom: 10px;
}

.g-and::before {
  inset: 8px 12px 8px 12px;
  border: 2px solid var(--steel);
  background: transparent;
  border-radius: 3px;
}

.g-and::after {
  width: 6px;
  height: 2px;
  left: 17px;
  top: 11px;
}

.g-core::before {
  width: 16px;
  height: 10px;
  left: 12px;
  top: 10px;
  border-radius: 1px;
}

.g-core::after {
  width: 12px;
  height: 8px;
  left: 14px;
  top: 22px;
  opacity: 0.55;
}

.g-yaml::before,
.g-yaml::after {
  height: 2px;
  left: 11px;
  width: 18px;
}

.g-yaml::before {
  top: 13px;
  box-shadow: 0 6px 0 var(--steel);
}

.g-yaml::after {
  top: 25px;
  width: 12px;
}

.g-theme::before {
  width: 10px;
  height: 10px;
  left: 10px;
  top: 15px;
}

.g-theme::after {
  width: 10px;
  height: 10px;
  left: 20px;
  top: 15px;
  opacity: 0.5;
}

.g-guard::before {
  width: 14px;
  height: 16px;
  left: 13px;
  top: 12px;
  clip-path: polygon(50% 0, 100% 22%, 100% 68%, 50% 100%, 0 68%, 0 22%);
}

.g-win::before {
  width: 16px;
  height: 16px;
  left: 12px;
  top: 12px;
}

.g-mac::before {
  width: 16px;
  height: 10px;
  left: 12px;
  top: 14px;
  border-radius: 3px 3px 1px 1px;
}

.g-mac::after {
  width: 8px;
  height: 3px;
  left: 16px;
  top: 25px;
}

.g-linux::before {
  width: 12px;
  height: 12px;
  left: 14px;
  top: 10px;
  border-radius: 50%;
}

.g-linux::after {
  width: 16px;
  height: 8px;
  left: 12px;
  top: 22px;
  border-radius: 0 0 6px 6px;
}

.tag {
  display: inline-block;
  margin-bottom: 0.15rem;
  color: var(--steel);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1.1rem;
  align-items: center;
}

.ticks {
  margin: 0.4rem 0 0.8rem;
  padding: 0;
  list-style: none;
}

.ticks li {
  position: relative;
  padding: 0.35rem 0 0.35rem 1.1rem;
  color: var(--fade);
}

.ticks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7rem;
  width: 8px;
  height: 2px;
  background: var(--steel);
}

.qna details {
  margin: 0.55rem 0 0;
  border-radius: var(--cut-s);
  box-shadow: var(--bar-s);
}

.qna summary {
  list-style: none;
  cursor: pointer;
  padding: 0.7rem 0.85rem;
  font-weight: 600;
}

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

.qna details[open] {
  box-shadow: var(--slot-s);
}

.qna details p {
  margin: 0;
  padding: 0 0.85rem 0.8rem;
  color: var(--fade);
}

.sheet {
  overflow: auto;
  margin-top: 0.8rem;
  border-radius: var(--cut-s);
  box-shadow: var(--slot);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

th,
td {
  padding: 0.65rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

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

code {
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.84em;
}

.pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.tile,
.step {
  padding: 0.8rem 0.85rem;
  border-radius: var(--cut-s);
  box-shadow: var(--bar-s);
}

.step {
  display: grid;
  grid-template-columns: 2rem 1fr;
  gap: 10px;
  align-items: start;
}

.step b {
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: var(--cut-s);
  box-shadow: var(--slot-s);
  font-size: 0.82rem;
}

.step-list,
.stack {
  display: grid;
  gap: 10px;
  margin-top: 0.85rem;
}

.base {
  padding: 1.6rem 0 1.3rem;
}

.base-box {
  padding: 1rem 1.05rem 0.85rem;
  border-radius: var(--cut);
  box-shadow: var(--bar);
}

.base-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 0.8fr 1.1fr;
  gap: 1rem;
}

.base h3 {
  font-size: 0.88rem;
  color: var(--fade);
}

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

.base li {
  margin: 0.28rem 0;
}

.base p {
  color: var(--fade);
  font-size: 0.88rem;
}

.legal {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 1rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--line);
  color: var(--hint);
  font-size: 0.78rem;
}

#github {
  margin-top: 0.7rem;
}

.can-move .block {
  opacity: 0;
  transform: translateY(8px);
}

.can-move .block.is-in {
  opacity: 1;
  transform: none;
  transition: opacity 0.35s ease, transform 0.35s ease;
}

@media (max-width: 900px) {
  .slot-row,
  .entry-row,
  .split,
  .pair,
  .base-grid,
  .os-bar {
    grid-template-columns: 1fr;
  }

  .os-bar {
    grid-template-columns: 48px 1fr;
  }

  .os-bar .knob {
    grid-column: 2;
    justify-self: start;
  }
}

@media (max-width: 800px) {
  .fold-btn {
    display: inline-flex;
  }

  .nav-row {
    position: fixed;
    inset: 68px 16px auto;
    display: none;
    padding: 0.7rem;
    background: var(--wash);
    box-shadow: var(--bar);
    border-radius: var(--cut);
  }

  .nav-row.is-open {
    display: block;
  }

  .nav-row ul {
    flex-direction: column;
    align-items: stretch;
  }

  body.is-lock {
    overflow: hidden;
  }
}

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

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

  .can-move .block {
    opacity: 1;
    transform: none;
  }
}