/* ============================================================
   TAICHIKB — YIN YANG THEME
   Black & White Taiji Design System
   ============================================================ */

:root {
  --yin: #000000;
  --yang: #ffffff;
  --gray-dark: #2a2a2a;
  --gray-mid: #888888;
  --gray-light: #e8e8e8;
  --gray-bg: #fafafa;
  --accent-gold: #c9a961;
  --serif: 'Cormorant Garamond', 'Playfair Display', 'Times New Roman', serif;
  --sans: 'Inter', 'Helvetica Neue', system-ui, sans-serif;
  --cjk: 'Noto Serif SC', 'Source Han Serif', serif;
}

/* ============================================================
   GLOBAL RESET — Strip MkDocs Material defaults
   ============================================================ */

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

html, body {
  background: var(--yang);
  color: var(--yin);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

/* Hide MkDocs chrome */
.md-header, .md-nav, .md-sidebar, .md-tabs,
[data-md-component="header"], [data-md-component="sidebar"],
[data-md-component="tabs"], .md-search, .md-footer-meta,
.md-banner, .md-source, .md-article__edit,
.md-header__button, .md-icon, .md-clipboard {
  display: none !important;
}

.md-content, .md-main, .md-main__inner, .md-content__inner,
.md-typeset, .md-content__article, article {
  max-width: 880px !important;
  margin: 0 auto !important;
  padding: 4rem 2rem !important;
  background: transparent !important;
  box-shadow: none !important;
}

/* Remove MkDocs background colors */
body, .md-container, .md-main {
  background: var(--yang);
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--serif);
  font-weight: 400;
  color: var(--yin);
  letter-spacing: -0.01em;
  line-height: 1.3;
}

h1 {
  font-size: 3.5rem;
  margin: 0 0 2rem 0;
  text-align: center;
}

h2 {
  font-size: 2.2rem;
  margin: 3rem 0 1.2rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--gray-light);
}

h3 {
  font-size: 1.5rem;
  margin: 2rem 0 0.8rem;
  font-style: italic;
}

h4 {
  font-size: 1.2rem;
  margin: 1.5rem 0 0.6rem;
  font-weight: 600;
}

p {
  margin: 0 0 1.2rem;
}

a {
  color: var(--yin);
  text-decoration: none;
  border-bottom: 1px solid var(--gray-mid);
  transition: border-color 0.3s ease;
}

a:hover {
  border-bottom-color: var(--yin);
}

ul, ol {
  padding-left: 1.8rem;
  margin-bottom: 1.2rem;
}

li {
  margin-bottom: 0.4rem;
}

blockquote {
  border-left: 3px solid var(--yin);
  padding-left: 1.5rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--gray-dark);
}

code {
  font-family: 'JetBrains Mono', monospace;
  background: var(--gray-light);
  padding: 0.1em 0.4em;
  border-radius: 3px;
  font-size: 0.9em;
}

hr {
  border: none;
  border-top: 1px solid var(--gray-light);
  margin: 3rem 0;
}

/* ============================================================
   TAIJI LOGO / BRAND
   ============================================================ */

.taiji-logo {
  width: 64px;
  height: 64px;
  display: inline-block;
  vertical-align: middle;
  filter: invert(0);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--yin);
}

/* ============================================================
   HEADER / NAV (minimal, top)
   ============================================================ */

.site-header {
  border-bottom: 1px solid var(--gray-light);
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--yang);
}

.site-nav {
  display: flex;
  gap: 1.25rem;
  align-items: center;
  flex-wrap: wrap;
}

.site-nav a {
  font-family: var(--sans);
  font-size: 0.9rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.site-nav a:hover,
.site-nav a.active {
  border-bottom-color: var(--yin);
}

.lang-switch {
  font-size: 0.85rem !important;
  font-weight: 600 !important;
  padding: 0.35rem 0.8rem !important;
  border: 1px solid var(--yin) !important;
  border-radius: 999px !important;
  display: inline-flex !important;
  align-items: center !important;
  gap: 6px !important;
  text-decoration: none !important;
  transition: all 0.2s ease !important;
}

.lang-switch:hover {
  background: var(--yin) !important;
  color: var(--yang) !important;
}

/* ============================================================
   HERO
   ============================================================ */

.hero {
  text-align: center;
  padding: 6rem 2rem 4rem;
}

.hero h1 {
  font-size: 4.5rem;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero .tagline {
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.4rem;
  color: var(--gray-mid);
  margin-bottom: 0.5rem;
}

.hero .taiji-large {
  width: 140px;
  height: 140px;
  margin: 2rem auto;
  display: block;
}

/* ============================================================
   SECTIONS
   ============================================================ */

.section {
  padding: 4rem 0;
  border-top: 1px solid var(--gray-light);
}

.section-title {
  text-align: center;
  margin-bottom: 3rem;
}

.section-title h2 {
  display: inline-block;
  border-bottom: none;
  position: relative;
  padding: 0 1rem;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: -0.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 40px;
  height: 1px;
  background: var(--yin);
}

/* ============================================================
   CARDS / GRIDS
   ============================================================ */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.card {
  padding: 2rem;
  border: 1px solid var(--gray-light);
  border-radius: 4px;
  transition: all 0.3s ease;
  background: var(--yang);
}

.card:hover {
  border-color: var(--yin);
  transform: translateY(-2px);
}

.card h3 {
  margin-top: 0;
  font-style: normal;
}

.card .card-meta {
  font-size: 0.85rem;
  color: var(--gray-mid);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

/* ============================================================
   TECHNIQUE / SECTION CARDS (Taiji-specific)
   ============================================================ */

.technique-card {
  padding: 2rem;
  margin: 2rem 0;
  border-left: 3px solid var(--yin);
  background: var(--gray-bg);
  border-radius: 0 4px 4px 0;
}

.technique-card h3 {
  margin-top: 0;
  font-style: normal;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.technique-card .han {
  font-family: var(--cjk);
  color: var(--gray-mid);
  font-size: 1.1rem;
}

/* ============================================================
   TECHNIQUE NAV (sidebar of techniques page)
   ============================================================ */

.technique-nav {
  background: var(--gray-bg);
  border: 1px solid var(--gray-light);
  border-radius: 4px;
  padding: 1.5rem;
  margin: 2rem 0 3rem;
}

.technique-nav ul {
  list-style: none;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.5rem;
}

.technique-nav a {
  display: block;
  padding: 0.6rem 0.8rem;
  border-bottom: none;
  border-left: 2px solid transparent;
  transition: all 0.2s ease;
}

.technique-nav a:hover,
.technique-nav a.active {
  border-left-color: var(--yin);
  background: var(--yang);
}

/* ============================================================
   FOOTER
   ============================================================ */

.site-footer {
  border-top: 1px solid var(--gray-light);
  padding: 3rem 2rem;
  text-align: center;
  color: var(--gray-mid);
  font-size: 0.9rem;
  margin-top: 6rem;
}

.site-footer p {
  margin: 0.4rem 0;
}

/* ============================================================
   LANDING PAGE FEATURE BLOCKS
   ============================================================ */

.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  margin: 4rem 0;
}

.feature-row.reverse {
  direction: rtl;
}

.feature-row.reverse > * {
  direction: ltr;
}

.feature-image {
  background: var(--gray-bg);
  border: 1px solid var(--gray-light);
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  width: 80%;
  margin: 0 auto;
}

.feature-image .taiji-large {
  width: 70%;
  height: 70%;
}

.feature-text h2 {
  border-bottom: none;
  margin-top: 0;
}

/* ============================================================
   PAGE FOOTER NAV (Prev/Home/Next)
   ============================================================ */

.page-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin: 4rem 0 0;
  padding: 2rem 0 0;
  border-top: 1px solid var(--gray-light);
  font-size: 0.9rem;
}

.page-nav a {
  border-bottom: none;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--gray-light);
  border-radius: 999px;
  transition: all 0.2s ease;
}

.page-nav a:hover {
  border-color: var(--yin);
  background: var(--yin);
  color: var(--yang);
}

.page-nav .home {
  border-color: var(--yin);
}

/* ============================================================
   YIN YANG SPINNER (loading indicator, optional)
   ============================================================ */

.taiji-spin {
  animation: taiji-rotate 4s linear infinite;
  display: inline-block;
}

@keyframes taiji-rotate {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 720px) {
  .site-header {
    flex-direction: column;
    gap: 1rem;
    align-items: flex-start;
  }
  .site-nav {
    flex-wrap: wrap;
    gap: 1rem;
  }
  h1 { font-size: 2.5rem; }
  .hero h1 { font-size: 3rem; }
  .feature-row {
    grid-template-columns: 1fr;
  }
  .card-grid {
    grid-template-columns: 1fr;
  }
}

/* ============================================================
   DARK MODE (auto)
   ============================================================ */

/* ============================================================
   SAFE THEME (DARK MODE CONTROLLED VIA body.dark-mode ONLY)
   Removed @media (prefers-color-scheme: dark) to prevent
   uncontrolled OS dark-mode from inverting text to white on mobile.
   ============================================================ */

body.dark-mode {
  --yin: #f5f5f4 !important;
  --yang: #121212 !important;
  --gray-dark: #d4d4d4 !important;
  --gray-mid: #a8a29e !important;
  --gray-light: #27272a !important;
  --gray-bg: #18181b !important;
  background-color: #121212 !important;
  color: #f5f5f4 !important;
}

body.dark-mode h1,
body.dark-mode h2,
body.dark-mode h3,
body.dark-mode h4,
body.dark-mode h5,
body.dark-mode h6 {
  color: #fef08a !important;
}

body.dark-mode p,
body.dark-mode li,
body.dark-mode span,
body.dark-mode div {
  color: #e4e4e7;
}

body.dark-mode strong {
  color: #ffffff !important;
}

body.dark-mode a {
  color: #fbbf24;
}

body.dark-mode .taiji-logo,
body.dark-mode .hero .taiji-large {
  filter: invert(1);
}

/* ============================================================
   INTRANET ARTICLE CONTENT (re-skinned pages)
   ============================================================ */

.intranet-content {
  line-height: 1.8;
  font-size: 1.05rem;
  color: var(--ink);
}

.intranet-content h1 {
  font-family: 'Cormorant Garamond', serif;
  font-size: 2.4rem;
  font-weight: 600;
  margin: 2.5rem 0 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--gray-mid);
}

.intranet-content h2 {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.8rem;
  font-weight: 600;
  margin: 2rem 0 1rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--gray-light);
}

.intranet-content h3 {
  font-family: 'Cormorant Garamond', serif;
  font-size: 1.4rem;
  font-weight: 500;
  margin: 1.5rem 0 0.8rem;
}

.intranet-content h4 {
  font-family: 'Inter', sans-serif;
  font-size: 1.15rem;
  font-weight: 600;
  margin: 1.2rem 0 0.6rem;
}

.intranet-content p {
  margin: 0.8rem 0;
}

.intranet-content ul, .intranet-content ol {
  margin: 0.8rem 0;
  padding-left: 1.5rem;
}

.intranet-content li {
  margin: 0.4rem 0;
}

.intranet-content blockquote {
  border-left: 4px solid var(--ink);
  padding: 0.5rem 1rem;
  margin: 1.5rem 0;
  font-style: italic;
  color: var(--gray-dark);
  background: var(--gray-light);
}

.intranet-content code {
  background: var(--gray-light);
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  font-family: 'Roboto Mono', monospace;
  font-size: 0.9em;
}

.intranet-content pre {
  background: var(--gray-light);
  padding: 1rem;
  border-radius: 4px;
  overflow-x: auto;
  border-left: 3px solid var(--ink);
}

.intranet-content hr {
  border: none;
  border-top: 1px solid var(--gray-mid);
  margin: 2rem 0;
}

.intranet-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.95rem;
}

.intranet-content th, .intranet-content td {
  border: 1px solid var(--gray-mid);
  padding: 0.5rem 0.75rem;
  text-align: left;
}

.intranet-content th {
  background: var(--gray-light);
  font-weight: 600;
}

.intranet-content a {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.intranet-content a:hover {
  background: var(--ink);
  color: var(--card);
}

.intranet-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 1rem auto;
}

.intranet-content .anchor-link {
  opacity: 0.3;
  font-size: 0.8em;
  margin-left: 0.4em;
  text-decoration: none;
}

.intranet-content .toc-level-1 a { font-weight: 600; }
.intranet-content .toc-level-2 a { padding-left: 0.8rem; }
.intranet-content .toc-level-3 a { padding-left: 1.6rem; font-size: 0.95em; color: var(--gray-dark); }

.intranet-content .toc-sidebar {
  display: none; /* hidden — main page-nav handles navigation */
}