/* Shared shell for bionickernel.com: tokens, sidebar layout, common components. */

/* Native cross-document transitions; ignored by browsers without support. */
@view-transition {
  navigation: auto;
}
@media (prefers-reduced-motion: reduce) {
  @view-transition {
    navigation: none;
  }
}

:root {
  color-scheme: dark light;
  /* CachyOS Nord (active KDE scheme) */
  --bg: #1e2233;
  --bg-elev: #161925;
  --border: #404552;
  --line: rgba(102, 194, 242, 0.14);
  --line-strong: rgba(102, 194, 242, 0.26);
  --fg: #66c2f2;
  --dim: #81a1c1;
  --faint: #7d93a8;
  --accent: #47add6;
  --accent-text: #63b9e4;
  --accent-contrast: #0a0b0c;
  --focus: #6dbccd;
  --glow: rgba(71, 173, 214, 0.16);
  --sidebar-w: 252px;
  --content-max: 62rem;
}

@media (prefers-color-scheme: light) {
  :root {
    /* Breeze Light */
    --bg: #eff0f1;
    --bg-elev: #ffffff;
    --border: #c9cdd1;
    --line: rgba(35, 38, 41, 0.1);
    --line-strong: rgba(35, 38, 41, 0.2);
    --fg: #232629;
    --dim: #5c6b78;
    --faint: #5f6d79;
    --accent: #3daee9;
    --accent-text: #1b6a97;
    --accent-contrast: #0b1c26;
    --focus: #1b6a97;
    --glow: rgba(61, 174, 233, 0.12);
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  min-height: 100dvh;
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  background: var(--bg);
  background:
    radial-gradient(56rem 26rem at 12% -10rem, var(--glow), transparent 68%),
    var(--bg);
  color: var(--fg);
  font-family:
    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 8px;
}

::selection {
  background: var(--accent);
  color: var(--accent-contrast);
}

/* ---------- sidebar ---------- */
.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.5rem 1.15rem 1.25rem;
  border-right: 1px solid var(--line);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: blur(10px);
  overflow-y: auto;
}

.sb-brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-width: 0;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.sb-brand div {
  min-width: 0;
  overflow: hidden;
}

.sb-brand img {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  border: 1px solid var(--border);
  flex: none;
}

.sb-brand span {
  display: block;
  font-size: 0.7rem;
  font-weight: 400;
  color: var(--faint);
  letter-spacing: 0.02em;
}

.sb-toggle {
  display: none;
  position: absolute;
  top: 1.1rem;
  right: 0.75rem;
  width: 26px;
  height: 26px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--bg-elev);
  color: var(--dim);
  font: inherit;
  font-size: 0.78rem;
  line-height: 1;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}
.sb-toggle:hover {
  color: var(--fg);
  border-color: var(--line-strong);
}
.sb-toggle-icon::before {
  content: "«";
}
.sb-collapsed .sb-toggle-icon::before {
  content: "»";
}

.sb-label {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--faint);
}

.sb-nav {
  display: grid;
  gap: 0.15rem;
  margin-top: 0.4rem;
  list-style: none;
}

.sb-nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.45rem 0.6rem;
  border-radius: 8px;
  color: var(--dim);
  text-decoration: none;
  font-size: 0.9rem;
  transition:
    background 0.15s ease,
    color 0.15s ease;
}

.sb-nav a:hover {
  background: var(--bg-elev);
  color: var(--fg);
}

.sb-nav a[aria-current="page"],
.sb-nav a[aria-current="location"] {
  color: var(--fg);
  background: var(--bg-elev);
  box-shadow: inset 2px 0 0 var(--accent);
}

.sb-nav .short {
  display: none;
}

.sb-nav .idx {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.7rem;
  color: var(--faint);
}

.sb-foot {
  margin-top: auto;
  overflow-wrap: anywhere;
  display: grid;
  gap: 0.45rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.76rem;
  color: var(--faint);
}

.sb-foot a {
  color: var(--faint);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.sb-foot a:hover {
  color: var(--fg);
  border-color: currentColor;
}

.sb-status {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.sb-status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex: none;
}

/* ---------- content ---------- */
.main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  overflow-x: clip;
}

.content {
  width: 100%;
  max-width: var(--content-max);
  padding: clamp(1.75rem, 4vw, 3.5rem) clamp(1.15rem, 4vw, 3.5rem)
    clamp(2rem, 5vw, 3.5rem);
}

.mono {
  font-family: ui-monospace, SFMono-Regular, "JetBrains Mono", Menlo, monospace;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--faint);
}

.mono .cjk {
  letter-spacing: 0.04em;
  text-transform: none;
}

h1 {
  font-size: clamp(1.9rem, 4.4vw, 2.8rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  text-wrap: balance;
}

.page-head .lede {
  margin-top: 0.9rem;
  max-width: 42rem;
  color: var(--dim);
  font-size: 0.97rem;
}

h2 {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--dim);
}

section {
  padding: clamp(1.9rem, 4vw, 2.75rem) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 88px;
}

.sec-head {
  display: flex;
  align-items: baseline;
  gap: 1rem;
}

.sec-head .num {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.74rem;
  color: var(--accent-text);
  letter-spacing: 0.08em;
}

.sec-head .hint {
  margin-left: auto;
  font-size: 0.78rem;
  color: var(--faint);
}

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  overflow-wrap: anywhere;
  gap: 0.5rem;
  padding: 0.58rem 1.1rem;
  border-radius: 9px;
  border: 1px solid var(--border);
  background: var(--bg-elev);
  color: var(--fg);
  font-size: 0.9rem;
  text-decoration: none;
  transition:
    border-color 0.16s ease,
    transform 0.16s ease,
    box-shadow 0.16s ease;
}

.btn:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 8px 20px -14px var(--accent);
}

.btn.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-contrast);
  font-weight: 600;
}

.btn.primary:hover {
  filter: brightness(1.07);
}

.btn svg {
  width: 15px;
  height: 15px;
  fill: currentColor;
  flex: none;
}

/* ---------- cards ---------- */
.cards {
  margin-top: 1.4rem;
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 1.15rem 1.2rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-elev);
  text-decoration: none;
  overflow: hidden;
  transition:
    border-color 0.18s ease,
    transform 0.18s ease,
    box-shadow 0.18s ease;
}

.card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.18s ease;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 18px 34px -28px var(--accent);
}

.card:hover::before {
  opacity: 1;
}

.card .top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.card p {
  font-size: 0.86rem;
  color: var(--dim);
}

.card .arrow {
  color: var(--accent-text);
  font-size: 1rem;
  transition: transform 0.18s ease;
}

.card:hover .arrow {
  transform: translateX(3px);
}

.meta {
  margin-top: auto;
  padding-top: 0.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.meta span {
  padding: 0.12rem 0.55rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 0.71rem;
  color: var(--faint);
}

/* ---------- picks ---------- */
.picks {
  margin-top: 1.25rem;
  display: grid;
  gap: 0.9rem;
}

.pick {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.25rem;
  align-items: center;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--bg-elev);
  transition:
    border-color 0.16s ease,
    transform 0.16s ease,
    box-shadow 0.16s ease;
}
.pick:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: 0 16px 30px -26px var(--accent);
}

.pick .top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.pick .url {
  font-size: 0.74rem;
  color: var(--faint);
  letter-spacing: 0.04em;
}

.pick h3 {
  margin-top: 0.3rem;
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.pick p {
  margin-top: 0.4rem;
  max-width: 40rem;
  font-size: 0.87rem;
  color: var(--dim);
}

.pick .meta {
  margin-top: 0.7rem;
  padding-top: 0;
}

/* ---------- ledger ---------- */
.ledger {
  margin-top: 1.4rem;
  display: grid;
}

.ledger div {
  display: grid;
  grid-template-columns: 9rem minmax(0, 1fr);
  gap: clamp(1rem, 4vw, 2.5rem);
  padding: 1rem 0;
  border-top: 1px dashed var(--line);
}

.ledger div:first-child {
  border-top: 0;
  padding-top: 0.2rem;
}

.ledger dt {
  font-size: 0.79rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--faint);
}

.ledger dd {
  margin: 0;
  font-size: 0.94rem;
  color: var(--dim);
}

.ledger dd strong {
  color: var(--fg);
  font-weight: 600;
}

/* ---------- footer ---------- */
.footer {
  margin-top: auto;
  border-top: 1px solid var(--line);
  padding: 1.1rem clamp(1.15rem, 4vw, 3.5rem) 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--faint);
}

.footer a {
  color: var(--faint);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.footer a:hover {
  color: var(--fg);
  border-color: currentColor;
}

/* ---------- collapsed rail (desktop) ---------- */
@media (min-width: 901px) {
  .js .sb-toggle {
    display: flex;
  }
  .js .sb-brand {
    padding-right: 2.2rem;
  }
  .sb-collapsed body {
    grid-template-columns: 78px minmax(0, 1fr);
  }
  .sb-collapsed .sidebar {
    padding: 3.4rem 0.5rem 1.5rem;
  }
  .sb-collapsed .sb-brand {
    justify-content: center;
    padding-right: 0;
  }
  .sb-collapsed .sb-brand div,
  .sb-collapsed .sb-label,
  .sb-collapsed .sb-foot,
  .sb-collapsed .sb-nav .idx {
    display: none;
  }
  .sb-collapsed .sb-nav {
    width: 100%;
  }
  .sb-collapsed .sb-nav a {
    justify-content: center;
    padding: 0.5rem 0;
    gap: 0;
  }
  .sb-collapsed .sb-nav .txt {
    position: absolute;
    width: 1px;
    height: 1px;
    margin: -1px;
    padding: 0;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
  }
  .sb-collapsed .sb-nav .short {
    display: inline;
    font-size: 0.85rem;
  }
  .sb-collapsed .sb-nav a[aria-current] {
    box-shadow: none;
    background: color-mix(in srgb, var(--accent) 14%, var(--bg-elev));
  }
  .sb-collapsed .sb-toggle {
    right: 50%;
    transform: translateX(50%);
  }
}

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  body {
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: auto 1fr;
    align-content: start;
  }
  .sidebar {
    height: auto;
    position: sticky;
    top: 0;
    z-index: 20;
    flex-direction: row;
    align-items: center;
    gap: 0.75rem;
    padding: 0.6rem 1rem;
    border-right: 0;
    border-bottom: 1px solid var(--line);
    overflow: visible;
  }
  .sb-brand img {
    width: 28px;
    height: 28px;
  }
  .sb-brand span,
  .sb-label,
  .sb-foot {
    display: none;
  }
  .sidebar > nav {
    flex: 1 1 auto;
    min-width: 0;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .sidebar > nav::-webkit-scrollbar {
    display: none;
  }
  .sb-nav {
    display: flex;
    width: max-content;
    gap: 0.1rem;
    margin: 0 0 0 auto;
  }
  .sb-nav a {
    padding: 0.35rem 0.4rem;
    font-size: 0.78rem;
    white-space: nowrap;
  }
  .sb-nav .idx {
    display: none;
  }
  .content {
    padding-top: 1.5rem;
  }
}

@media (max-width: 420px) {
  .sb-brand div {
    display: none;
  }
}

@media (max-width: 640px) {
  .sec-head {
    flex-wrap: wrap;
    gap: 0.35rem 0.75rem;
  }
  .sec-head .hint {
    margin-left: 0;
  }
  .ledger div {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.3rem;
  }
  .pick {
    grid-template-columns: minmax(0, 1fr);
    align-items: start;
  }
  .pick .btn {
    justify-self: start;
  }
  .footer {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .btn,
  .card,
  .pick,
  .card .arrow,
  .sb-nav a {
    transition: none;
  }
  .btn:hover,
  .card:hover,
  .pick:hover {
    transform: none;
  }
  .card:hover .arrow {
    transform: none;
  }
}