/* =========================================
   倾城の心 · Shared Stylesheet
   ========================================= */

/* ------------- Design Tokens ------------- */
:root {
  --ink: #0E0F13;
  --ink-2: #151821;
  --ink-3: #1C202C;
  --paper: #EDE6D3;
  --paper-dim: #A8A293;
  --cinnabar: #C8392E;
  --cinnabar-deep: #9E2A21;
  --gold: #C8A96A;
  --gold-dim: #7A6A45;
  --jade: #5C8A6B;
  --line: rgba(237, 230, 211, 0.12);
  --line-strong: rgba(237, 230, 211, 0.24);

  --font-serif: "Noto Serif SC", "Source Han Serif SC", serif;
  --font-sans: "Noto Sans SC", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --font-pixel: "VT323", monospace;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ------------- Light theme overrides ------------- */
[data-theme="light"] {
  --ink: #F5EEDB;
  --ink-2: #EBE2C9;
  --ink-3: #DFD4B7;
  --paper: #1C2029;
  --paper-dim: #6B6E7A;
  --line: rgba(28, 32, 41, 0.14);
  --line-strong: rgba(28, 32, 41, 0.28);
}
[data-theme="light"] body {
  background-image:
    repeating-linear-gradient(0deg, rgba(28,32,41,0.045) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(90deg, rgba(28,32,41,0.045) 0 1px, transparent 1px 32px);
}
[data-theme="light"] .nav {
  background: rgba(245, 238, 219, 0.78);
}
[data-theme="light"] ::selection { color: var(--ink); }

/* Verse gradient adapts to light */
[data-theme="light"] .verse {
  background:
    radial-gradient(ellipse at 50% 50%, rgba(200,57,46,0.06), transparent 60%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-3) 28%, var(--ink-3) 72%, var(--ink) 100%);
}

[data-theme="light"] .contact-card,
[data-theme="light"] .member,
[data-theme="light"] .tut-list li {
  background: var(--ink-2);
}
[data-theme="light"] .sponsor-empty {
  color: var(--paper-dim);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--paper);
  background: var(--ink);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-wrap: pretty;
  background-image:
    repeating-linear-gradient(0deg, rgba(237,230,211,0.035) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(90deg, rgba(237,230,211,0.035) 0 1px, transparent 1px 32px);
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
::selection { background: var(--cinnabar); color: var(--paper); }

/* ------------- Layout ------------- */
.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
}

/* ------------- Nav ------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  background: rgba(14, 15, 19, 0.72);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 20px;
  letter-spacing: 0.16em;
  line-height: 1;
}
.brand small {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  color: var(--paper-dim);
  letter-spacing: 0.28em;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links a {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--paper-dim);
  transition: color 200ms var(--ease);
}
.nav-links a::before {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 4px;
  transform: translateX(-50%);
  width: 0;
  height: 2px;
  background: var(--cinnabar);
  transition: width 240ms var(--ease);
}
.nav-links a:hover,
.nav-links a.active { color: var(--paper); }
.nav-links a:hover::before,
.nav-links a.active::before { width: 18px; }
.nav-sep {
  width: 3px;
  height: 3px;
  background: var(--paper-dim);
  opacity: 0.4;
  margin: 0 2px;
}

/* Theme toggle */
.theme-toggle {
  width: 36px;
  height: 36px;
  margin-left: 10px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--paper-dim);
  cursor: pointer;
  font-size: 14px;
  line-height: 1;
  font-family: var(--font-mono);
  transition: color 200ms var(--ease), border-color 200ms var(--ease), transform 200ms var(--ease);
}
.theme-toggle:hover {
  color: var(--gold);
  border-color: var(--gold);
  transform: rotate(18deg);
}
.theme-toggle .ic-sun,
.theme-toggle .ic-moon { display: none; }
.theme-toggle .ic-moon { display: inline; }
[data-theme="light"] .theme-toggle .ic-moon { display: none; }
[data-theme="light"] .theme-toggle .ic-sun { display: inline; }

/* ------------- Page header (non-index pages) ------------- */
.page-head {
  position: relative;
  padding: clamp(80px, 14vh, 140px) 0 clamp(48px, 8vh, 80px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
  isolation: isolate;
}
.page-head::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse at 80% 20%, rgba(200,169,106,0.08), transparent 50%),
    radial-gradient(ellipse at 10% 90%, rgba(200,57,46,0.07), transparent 55%);
}
.page-head-inner {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
.page-head h1 {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(44px, 6vw, 80px);
  line-height: 1.05;
  letter-spacing: 0.08em;
  margin: 16px 0 0;
}
.page-head h1 .accent { color: var(--cinnabar); }
.page-head-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--gold);
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 12px;
}
.page-head-meta::before {
  content: "";
  width: 32px;
  height: 1px;
  background: var(--gold);
}
.page-head-desc {
  color: var(--paper-dim);
  max-width: 48ch;
  line-height: 1.8;
  margin: 0;
  font-size: 15px;
}

/* ------------- Section band ------------- */
section.band {
  padding: clamp(80px, 12vh, 140px) 0;
  border-top: 1px solid var(--line);
  position: relative;
}
.section-head {
  display: flex;
  align-items: baseline;
  gap: 20px;
  margin-bottom: 56px;
}
.section-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--gold);
}
.section-title {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(32px, 4vw, 52px);
  margin: 0;
  letter-spacing: 0.04em;
}
.section-desc {
  color: var(--paper-dim);
  max-width: 52ch;
  margin: 12px 0 0;
  line-height: 1.8;
}
.section-head-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 56px;
  flex-wrap: wrap;
  gap: 24px;
}

/* ------------- Verse band ------------- */
.verse {
  text-align: center;
  padding: clamp(100px, 16vh, 180px) 0;
  background:
    radial-gradient(ellipse at 50% 50%, rgba(200,57,46,0.06), transparent 60%),
    linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 28%, var(--ink-2) 72%, var(--ink) 100%);
  position: relative;
}
.verse::before,
.verse::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  width: min(60%, 480px);
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line-strong), transparent);
}
.verse::before { top: 0; }
.verse::after { bottom: 0; }
.verse p {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.7;
  letter-spacing: 0.24em;
  color: var(--paper);
  margin: 0;
  font-weight: 400;
}
.verse p span { color: var(--cinnabar); }
.verse small {
  display: block;
  margin-top: 32px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.28em;
  color: var(--gold);
}

/* ------------- Timeline (updates page) ------------- */
.timeline {
  position: relative;
  padding-left: 40px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, transparent, var(--line-strong) 8%, var(--line-strong) 92%, transparent);
}
.t-item {
  position: relative;
  padding: 0 0 72px;
}
.t-item:last-child { padding-bottom: 0; }
.t-item::before {
  content: "";
  position: absolute;
  left: -37px;
  top: 10px;
  width: 10px;
  height: 10px;
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--ink), 0 0 0 5px var(--gold-dim);
}
.t-item.major::before { background: var(--cinnabar); box-shadow: 0 0 0 4px var(--ink), 0 0 0 5px var(--cinnabar); }
.t-head {
  display: flex;
  align-items: baseline;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}
.t-version {
  font-family: var(--font-pixel);
  font-size: 40px;
  color: var(--paper);
  line-height: 1;
  letter-spacing: 0.04em;
}
.t-item.major .t-version { color: var(--cinnabar); }
.t-date {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--paper-dim);
}
.t-title {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 600;
  margin: 0 0 16px;
  color: var(--paper);
}
.t-tags {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}
.t-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  padding: 4px 10px;
  border: 1px solid var(--line-strong);
  color: var(--paper-dim);
  text-transform: uppercase;
}
.t-tag.add { color: var(--jade); border-color: rgba(92,138,107,0.5); }
.t-tag.fix { color: var(--gold); border-color: rgba(200,169,106,0.5); }
.t-tag.change { color: var(--paper); border-color: rgba(237,230,211,0.35); }
.t-tag.remove { color: var(--cinnabar); border-color: rgba(200,57,46,0.5); }
.t-body ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.t-body li {
  position: relative;
  padding-left: 22px;
  color: var(--paper);
  line-height: 1.8;
  font-size: 14px;
}
.t-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  background: var(--gold);
  opacity: 0.6;
}
.t-body li b { color: var(--cinnabar); font-weight: 500; }

/* ------------- Wiki layout ------------- */
.wiki-layout {
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 64px;
}
@media (max-width: 900px) {
  .wiki-layout { grid-template-columns: 1fr; gap: 32px; }
}
.wiki-side {
  position: sticky;
  top: 96px;
  align-self: start;
  max-height: calc(100vh - 120px);
  overflow-y: auto;
  padding-right: 8px;
}
@media (max-width: 900px) {
  .wiki-side { position: static; max-height: none; }
}
.wiki-side::-webkit-scrollbar { width: 4px; }
.wiki-side::-webkit-scrollbar-thumb { background: var(--line-strong); }
.wiki-group {
  margin-bottom: 28px;
}
.wiki-group h5 {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.28em;
  color: var(--gold);
  margin: 0 0 12px;
  text-transform: uppercase;
}
.wiki-group ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}
.wiki-group a {
  display: block;
  padding: 8px 12px;
  font-size: 14px;
  color: var(--paper-dim);
  border-left: 2px solid transparent;
  transition: all 160ms var(--ease);
}
.wiki-group a:hover {
  color: var(--paper);
  background: rgba(237,230,211,0.03);
  border-left-color: var(--gold-dim);
}
.wiki-group a.active {
  color: var(--paper);
  background: rgba(200,57,46,0.08);
  border-left-color: var(--cinnabar);
}

.wiki-plugin {
  padding: 48px 0;
  border-bottom: 1px solid var(--line);
}
.wiki-plugin:first-child { padding-top: 0; }
.wiki-plugin:last-child { border-bottom: none; }
.wiki-plugin-head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 8px;
}
.wiki-plugin-head h2 {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 600;
  margin: 0;
  letter-spacing: 0.04em;
}
.wiki-plugin-head .chip {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  padding: 3px 9px;
  background: rgba(200,169,106,0.1);
  border: 1px solid rgba(200,169,106,0.3);
  color: var(--gold);
  text-transform: uppercase;
}
.wiki-plugin-intro {
  color: var(--paper-dim);
  line-height: 1.85;
  max-width: 64ch;
  margin: 0 0 28px;
}
.wiki-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.26em;
  color: var(--gold);
  text-transform: uppercase;
  margin: 28px 0 14px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.wiki-sub::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--gold);
}
.cmd-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
.cmd-table th,
.cmd-table td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.cmd-table th {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--paper-dim);
  text-transform: uppercase;
  font-weight: 400;
  background: rgba(237,230,211,0.02);
}
.cmd-table td code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gold);
  background: rgba(200,169,106,0.08);
  padding: 2px 8px;
  border: 1px solid rgba(200,169,106,0.2);
  white-space: nowrap;
}
.cmd-table td:last-child { color: var(--paper); line-height: 1.7; }
.cmd-table tr:hover td { background: rgba(237,230,211,0.02); }

.tut-list {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: tut;
  display: grid;
  gap: 14px;
}
.tut-list li {
  position: relative;
  padding: 14px 16px 14px 52px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  color: var(--paper);
  line-height: 1.7;
  font-size: 14px;
  counter-increment: tut;
}
.tut-list li::before {
  content: counter(tut, decimal-leading-zero);
  position: absolute;
  left: 16px;
  top: 14px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cinnabar);
}
.tut-list li code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gold);
  background: rgba(200,169,106,0.08);
  padding: 1px 6px;
  border: 1px solid rgba(200,169,106,0.2);
}

/* ------------- Team / about ------------- */
.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.member {
  background: var(--ink);
  padding: 36px 32px;
  display: flex;
  gap: 20px;
  align-items: flex-start;
  transition: background 260ms var(--ease);
}
.member:hover { background: rgba(200,57,46,0.04); }
.member .avatar {
  width: 64px;
  height: 64px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 28px;
  background: var(--ink-2);
  border: 1px solid var(--line-strong);
  color: var(--paper);
  letter-spacing: 0;
}
.member .avatar.cinnabar { color: var(--cinnabar); border-color: rgba(200,57,46,0.5); }
.member .avatar.gold { color: var(--gold); border-color: rgba(200,169,106,0.5); }
.member h4 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 600;
  margin: 0 0 4px;
}
.member .mid {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--paper-dim);
  display: block;
  margin-bottom: 10px;
}
.member .role {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.24em;
  color: var(--cinnabar);
  text-transform: uppercase;
  margin-bottom: 10px;
  display: inline-block;
}
.member p {
  color: var(--paper-dim);
  font-size: 13px;
  line-height: 1.8;
  margin: 0;
}

.sponsor-empty {
  padding: 60px 32px;
  border: 1px dashed var(--line-strong);
  text-align: center;
  color: var(--paper-dim);
}
.sponsor-empty strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--paper);
  margin-bottom: 10px;
  letter-spacing: 0.08em;
}

.about-intro {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}
@media (min-width: 900px) {
  .about-intro { grid-template-columns: 1fr 1fr; gap: 80px; }
}
.about-intro h2 {
  font-family: var(--font-serif);
  font-size: clamp(32px, 4vw, 48px);
  font-weight: 600;
  margin: 0;
  letter-spacing: 0.06em;
  line-height: 1.2;
}
.about-intro p {
  color: var(--paper);
  line-height: 1.95;
  font-size: 15px;
  margin: 0 0 18px;
}
.about-intro p:last-child { margin-bottom: 0; }

.contact-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.contact-card {
  background: var(--ink);
  padding: 32px;
}
.contact-card .label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.28em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 14px;
  display: block;
}
.contact-card .value {
  font-family: var(--font-mono);
  font-size: 22px;
  letter-spacing: 0.08em;
  color: var(--paper);
  margin-bottom: 8px;
  word-break: break-all;
}
.contact-card .note {
  color: var(--paper-dim);
  font-size: 13px;
  line-height: 1.7;
  margin: 0;
}

/* ------------- Footer ------------- */
footer {
  padding: 96px 0 40px;
  border-top: 1px solid var(--line);
  background: var(--ink);
  position: relative;
}
footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 50%;
  transform: translateX(-50%);
  width: 64px;
  height: 2px;
  background: var(--cinnabar);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 56px;
  margin-bottom: 56px;
}
@media (min-width: 720px) {
  .footer-grid {
    grid-template-columns: 2.2fr 1fr 1.2fr;
    gap: 56px;
  }
}

footer h5 {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.42em;
  color: var(--paper);
  margin: 0 0 22px;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 12px;
}
footer h5::before {
  content: "";
  width: 18px;
  height: 1px;
  background: var(--cinnabar);
  flex-shrink: 0;
}
footer p {
  color: var(--paper-dim);
  font-size: 14px;
  line-height: 1.9;
  margin: 0;
}
footer ul { list-style: none; margin: 0; padding: 0; }
footer li {
  color: var(--paper-dim);
  font-size: 14px;
  line-height: 2;
}
footer a {
  color: inherit;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  transition: color 200ms var(--ease);
}
footer a::before {
  content: "→";
  color: var(--gold);
  margin-right: 0;
  opacity: 0;
  max-width: 0;
  overflow: hidden;
  transition: opacity 220ms var(--ease), max-width 220ms var(--ease), margin-right 220ms var(--ease);
}
footer a:hover {
  color: var(--paper);
}
footer a:hover::before {
  opacity: 1;
  max-width: 20px;
  margin-right: 8px;
}

/* First column (brand description) */
.footer-grid > div:first-child p {
  color: var(--paper);
  position: relative;
  padding-left: 18px;
  max-width: 44ch;
}
.footer-grid > div:first-child p::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: var(--cinnabar);
}

/* Developer column: first li is the name (serif), rest are mono-uppercase */
.footer-grid > div:last-child li:first-child {
  font-family: var(--font-serif);
  font-size: 18px;
  letter-spacing: 0.08em;
  color: var(--paper);
  margin-bottom: 10px;
  line-height: 1.4;
}
.footer-grid > div:last-child li:not(:first-child) {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.28em;
  color: var(--gold);
  text-transform: uppercase;
  line-height: 1.7;
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--paper-dim);
  flex-wrap: wrap;
  gap: 16px;
}
.footer-bottom .pixel-row {
  display: inline-flex;
  gap: 2px;
}
.footer-bottom .pixel-row i {
  width: 6px; height: 6px; background: var(--gold); opacity: 0.4;
}

/* ------------- Reveal animation ------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 700ms var(--ease), transform 700ms var(--ease);
}
.reveal.in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
  .reveal { opacity: 1; transform: none; }
}

/* ------------- Mobile nav ------------- */
@media (max-width: 680px) {
  .nav-links a { padding: 8px 10px; font-size: 13px; letter-spacing: 0.08em; }
  .brand { font-size: 17px; }
  .brand small { display: none; }
}

/* ------------- Mobile refinements ------------- */
@media (max-width: 640px) {
  .page-head h1 { letter-spacing: 0.06em; }
  .timeline { padding-left: 28px; }
  .t-item::before { left: -26px; }
  .t-version { font-size: 32px; }
}

@media (max-width: 600px) {
  .footer-bottom {
    justify-content: center;
    text-align: center;
    flex-direction: column;
  }
  .footer-bottom .pixel-row { order: -1; }
}

@media (max-width: 520px) {
  .nav-sep { display: none; }
  .nav-links { gap: 0; }
  .nav-links a { padding: 6px 8px; font-size: 12px; letter-spacing: 0.06em; }
  .theme-toggle {
    width: 32px;
    height: 32px;
    margin-left: 6px;
    font-size: 13px;
  }
  .brand { font-size: 16px; letter-spacing: 0.12em; }
}

/* Wiki side collapsible on narrow screens */
@media (max-width: 900px) {
  .wiki-side {
    border: 1px solid var(--line);
    padding: 0;
    overflow: hidden;
  }
  .wiki-toggle {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 14px 18px;
    background: transparent;
    border: 0;
    color: var(--paper);
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.24em;
    cursor: pointer;
    text-transform: uppercase;
  }
  .wiki-toggle::after {
    content: "+";
    font-size: 20px;
    color: var(--gold);
    transition: transform 200ms var(--ease);
  }
  .wiki-side.open .wiki-toggle::after { transform: rotate(45deg); }
  .wiki-side-body {
    display: none;
    padding: 4px 18px 14px;
    border-top: 1px solid var(--line);
  }
  .wiki-side.open .wiki-side-body { display: block; }
}
@media (min-width: 901px) {
  .wiki-toggle { display: none; }
  .wiki-side-body { display: block; }
}

/* 主题切换时的全局过渡(非首页没有像素月,不需要排除) */
:root.theme-switching *,
:root.theme-switching *::before,
:root.theme-switching *::after {
  transition:
    background-color 320ms ease,
    background-image 320ms ease,
    color 320ms ease,
    border-color 320ms ease,
    box-shadow 320ms ease,
    filter 320ms ease !important;
}

/* Back-to-top floating button */
.back-to-top {
  position: fixed;
  right: clamp(16px, 3vw, 28px);
  bottom: clamp(16px, 3vw, 28px);
  width: 44px;
  height: 44px;
  border: 1px solid var(--line-strong);
  background: var(--ink-2);
  color: var(--paper-dim);
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(20px);
  transition:
    opacity 280ms var(--ease),
    transform 280ms var(--ease),
    color 200ms var(--ease),
    border-color 200ms var(--ease),
    background 200ms var(--ease);
  z-index: 90;
  display: grid;
  place-items: center;
}
.back-to-top.show {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}
.back-to-top:hover {
  color: var(--gold);
  border-color: var(--gold);
  background: var(--ink-3);
}
@media (max-width: 640px) {
  .back-to-top { width: 40px; height: 40px; font-size: 18px; }
}

/* ============================================================
   404 Page
   ============================================================ */
.nf-hero {
  min-height: calc(100vh - 80px);
  display: grid;
  place-items: center;
  padding: 80px 0;
  position: relative;
  overflow: hidden;
  text-align: center;
}
.nf-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, rgba(200,57,46,0.025) 0 1px, transparent 1px 32px),
    repeating-linear-gradient(90deg, rgba(200,57,46,0.025) 0 1px, transparent 1px 32px);
  pointer-events: none;
  z-index: 0;
}
.nf-hero .container {
  max-width: 640px;
  position: relative;
  z-index: 1;
}
.nf-num {
  font-family: var(--font-pixel);
  font-size: clamp(140px, 22vw, 260px);
  line-height: 0.9;
  color: var(--cinnabar);
  letter-spacing: 0.04em;
  text-shadow:
    4px 4px 0 rgba(200,57,46,0.18),
    8px 8px 0 rgba(200,57,46,0.08);
  margin-bottom: 20px;
  user-select: none;
}
.nf-deco {
  width: 120px;
  height: 1px;
  background: var(--gold);
  margin: 0 auto 30px;
  position: relative;
}
.nf-deco::before,
.nf-deco::after {
  content: "";
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 6px;
  background: var(--gold);
}
.nf-deco::before { left: -16px; }
.nf-deco::after { right: -16px; }
.nf-title {
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.6vw, 40px);
  letter-spacing: 0.06em;
  margin: 0 0 20px;
  line-height: 1.4;
  font-weight: 600;
}
.nf-title span {
  color: var(--gold);
  font-style: italic;
  font-weight: 400;
}
.nf-desc {
  color: var(--paper-dim);
  font-size: 15px;
  line-height: 1.9;
  margin: 0 0 40px;
}
.nf-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}
.nf-btn {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  padding: 14px 22px;
  border: 1px solid var(--line-strong);
  color: var(--paper);
  text-decoration: none;
  text-transform: uppercase;
  transition: color 200ms var(--ease), border-color 200ms var(--ease), background 200ms var(--ease);
}
.nf-btn:hover {
  border-color: var(--gold);
  color: var(--gold);
}
.nf-btn.primary {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: var(--paper);
}
.nf-btn.primary:hover {
  background: var(--cinnabar-deep);
  border-color: var(--cinnabar-deep);
  color: var(--paper);
}
.nf-foot {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.42em;
  color: var(--paper-dim);
  opacity: 0.55;
  text-transform: uppercase;
}