/* ============================================================
   Site shell — single source of chrome for every Acidev page.
   Pages provide their own content styles; this file owns:
   design tokens, canvas/background, floating navbar, brand
   breadcrumbs, nav links, mode/lang controls, footer.
   Behavior lives in assets/site-shell.js (lang / mode / scroll).
   ============================================================ */

:root {
  --bg: #20211f;
  --surface: #282925;
  --surface-2: rgba(255, 255, 255, .035);
  --ink: #e8e6de;
  --muted: #aaa79e;
  --faint: #77756e;
  --line: rgba(232, 230, 222, .14);
  --line-strong: rgba(232, 230, 222, .25);
  --grid: rgba(232, 230, 222, .10);
  --accent: #6aa99f;
  --accent-soft: rgba(106, 169, 159, .15);
  --accent-ink: #17201e;
  --shadow: rgba(0, 0, 0, .18);
  --radius: 14px;
  --small: 8px;
  --ease: cubic-bezier(.2, .75, .2, 1)
}

html[data-theme="cobalt"] {
  --accent: #7199d1;
  --accent-soft: rgba(113, 153, 209, .15);
  --accent-ink: #171b22
}

html[data-theme="amber"] {
  --accent: #d2a65f;
  --accent-soft: rgba(210, 166, 95, .16);
  --accent-ink: #211b12
}

html[data-mode="light"] {
  --bg: #e9e6dc;
  --surface: #f2efe7;
  --surface-2: rgba(255, 255, 255, .42);
  --ink: #292925;
  --muted: #716f68;
  --faint: #aaa79d;
  --line: rgba(41, 41, 37, .15);
  --line-strong: rgba(41, 41, 37, .26);
  --grid: rgba(41, 41, 37, .12);
  --shadow: rgba(35, 34, 30, .08);
  --accent: #39756c;
  --accent-soft: rgba(57, 117, 108, .13);
  --accent-ink: #f2f7f4
}

html[data-mode="light"][data-theme="cobalt"] {
  --accent: #315f9b;
  --accent-soft: rgba(49, 95, 155, .13);
  --accent-ink: #f4f6fa
}

html[data-mode="light"][data-theme="amber"] {
  --accent: #9a6a24;
  --accent-soft: rgba(154, 106, 36, .14);
  --accent-ink: #fff8ed
}

/* ---- canvas ------------------------------------------------- */

* {
  box-sizing: border-box
}

html {
  scroll-behavior: smooth
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Noto Sans SC", system-ui, sans-serif;
  background: radial-gradient(circle at 1px 1px, var(--grid) .85px, transparent 1.1px) 0 0/19px 19px, var(--bg);
  overflow-x: hidden;
  transition: background .25s ease, color .25s ease
}

/* film-grain overlay (same on every page) */
body:before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: .035;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
  z-index: 41
}

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

button {
  font: inherit;
  color: inherit
}

button:focus-visible,
a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px
}

[hidden] {
  display: none !important
}

.shell {
  max-width: 1240px;
  margin: auto;
  padding: 22px 30px 72px
}

/* ---- floating navbar ---------------------------------------- */

.navbar-fixed {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  padding-top: 14px;
  pointer-events: none;
  transition: transform .32s var(--ease), opacity .25s ease
}

.navbar-fixed.is-hidden,
.navbar-fixed.nav-hidden {
  transform: translateY(calc(-100% - 20px));
  opacity: .001;
  pointer-events: none
}

.navbar {
  pointer-events: auto;
  width: min(1180px, calc(100% - 32px));
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 4px 14px var(--shadow);
  padding: 9px 12px 9px 14px
}

.brand-path {
  display: flex;
  align-items: center;
  gap: 7px;
  min-width: 0;
  font-size: 13px
}

.brand {
  display: flex;
  align-items: center;
  gap: 9px;
  color: var(--accent);
  white-space: nowrap
}

.brand-mark {
  display: block;
  flex: 0 0 auto;
  color: var(--accent)
}

.brand-name {
  font: 600 13px "IBM Plex Mono";
  letter-spacing: .02em;
  color: var(--ink)
}

.brand--parent .brand-name {
  color: var(--faint);
  transition: color .18s
}

.brand--parent:hover .brand-name,
.brand--parent:focus-visible .brand-name {
  color: var(--accent)
}

.brand-sep {
  font: 600 13px "IBM Plex Mono";
  color: var(--faint);
  opacity: .55
}

/* center links (homepage Work/Tools/Blog/…, techne 方向/状态/…) */
.nav {
  display: flex;
  gap: 2px
}

.nav a {
  padding: 6px 10px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 13px
}

.nav a:hover,
.nav a:focus-visible {
  background: var(--accent-soft);
  color: var(--ink)
}

/* ---- mode / lang controls ----------------------------------- */

.controls {
  display: flex;
  align-items: center;
  gap: 4px
}

.control {
  width: 32px;
  height: 32px;
  border: 1px solid transparent;
  background: transparent;
  border-radius: 50%;
  display: grid;
  place-items: center;
  cursor: pointer;
  color: var(--muted);
  transition: background .18s, border-color .18s, color .18s
}

.control:hover {
  background: var(--accent-soft);
  border-color: var(--line);
  color: var(--accent)
}

.control svg {
  width: 15px;
  height: 15px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.2
}

.control#modeBtn {
  position: relative
}

.control#modeBtn svg {
  position: absolute;
  inset: 8px;
  width: 15px;
  height: 15px;
  transition: opacity .22s ease, transform .42s var(--ease)
}

.control#modeBtn #iconMoon {
  opacity: 1;
  transform: rotate(0) scale(1)
}

.control#modeBtn #iconSun {
  opacity: 0;
  transform: rotate(-90deg) scale(.55)
}

.control#modeBtn.is-light #iconMoon {
  opacity: 0;
  transform: rotate(90deg) scale(.55)
}

.control#modeBtn.is-light #iconSun {
  opacity: 1;
  transform: rotate(0) scale(1)
}

/* ---- footer -------------------------------------------------- */

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-top: 68px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
  font: 10px "IBM Plex Mono";
  color: var(--faint)
}

.footer-meta {
  display: flex;
  align-items: center;
  gap: 18px
}

.footer-meta>a {
  color: var(--accent)
}

.footer-meta>a:hover {
  color: var(--ink)
}

.socials {
  display: flex;
  align-items: center;
  gap: 10px
}

.socials a {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  color: var(--muted);
  border: 1px solid transparent;
  border-radius: 50%;
  transition: background .18s, color .18s, border-color .18s
}

.socials a:hover {
  background: var(--accent-soft);
  border-color: var(--line);
  color: var(--accent)
}

.socials svg {
  width: 14px;
  height: 14px;
  fill: currentColor
}

/* ---- responsive ---------------------------------------------- */

@media(max-width:900px) {
  .shell {
    padding: 16px 18px 60px
  }

  .nav {
    display: none
  }
}

@media(max-width:600px) {
  .footer {
    align-items: flex-start;
    flex-direction: column;
    gap: 14px;
    margin-top: 48px
  }

  .footer-meta {
    width: 100%;
    justify-content: space-between
  }
}

@media(prefers-reduced-motion:reduce) {

  *,
  *:before,
  *:after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important
  }
}