/* ORCA Guide — styled to match the main Donghwan KIM site
   Reuses IBM Plex fonts and the same color palette / dark-mode tokens. */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@300;400;500;600;700&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

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

:root {
  --primary-color: #1a365d;
  --secondary-color: #2c5282;
  --accent-color: #2b6cb0;
  --text-dark: #1a202c;
  --text-light: #4a5568;
  --text-muted: #718096;
  --bg-light: #f7fafc;
  --bg-white: #ffffff;
  --bg-code: #f1f5f9;
  --border-color: #e2e8f0;
  --sidebar-width: 280px;
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 4px 16px -2px rgba(0, 0, 0, 0.08);

  --syntax-comment: #718096;
  --syntax-keyword: #2b6cb0;
  --syntax-keyword2: #805ad5;
  --syntax-number: #c05621;
  --syntax-string: #2f855a;

  --note-bg: #ebf8ff;
  --note-border: #4299e1;
  --tip-bg: #f0fff4;
  --tip-border: #48bb78;
  --warning-bg: #fffaf0;
  --warning-border: #ed8936;
  --caution-bg: #fff5f5;
  --caution-border: #f56565;
}

@media (prefers-color-scheme: dark) {
  :root {
    --primary-color: #4299e1;
    --secondary-color: #3182ce;
    --accent-color: #63b3ed;
    --text-dark: #e2e8f0;
    --text-light: #cbd5e0;
    --text-muted: #a0aec0;
    --bg-light: #1a202c;
    --bg-white: #2d3748;
    --bg-code: #1a202c;
    --border-color: #4a5568;

    --syntax-comment: #a0aec0;
    --syntax-keyword: #63b3ed;
    --syntax-keyword2: #b794f4;
    --syntax-number: #f6ad55;
    --syntax-string: #68d391;

    --note-bg: #2a4365;
    --note-border: #4299e1;
    --tip-bg: #22543d;
    --tip-border: #48bb78;
    --warning-bg: #7b341e;
    --warning-border: #ed8936;
    --caution-bg: #742a2a;
    --caution-border: #f56565;
  }
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.75;
  color: var(--text-dark);
  background-color: var(--bg-light);
  font-weight: 400;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--primary-color);
  text-decoration: underline;
}

/* === Layout === */
.layout {
  display: flex;
  min-height: 100vh;
}

/* === Sidebar (ORCA guide internal ToC) === */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background-color: var(--bg-white);
  border-right: 1px solid var(--border-color);
  overflow-y: auto;
  padding: 2rem 0;
  z-index: 100;
}

/* Back link to the main portfolio site, sits above the brand block */
.sidebar-back {
  display: block;
  padding: 0 1.5rem 0.5rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-decoration: none;
  letter-spacing: 0.02em;
  transition: color 0.15s ease;
}

.sidebar-back:hover {
  color: var(--accent-color);
  text-decoration: none;
}

/* KO / EN language toggle */
.sidebar-lang {
  display: flex;
  gap: 0.4rem;
  padding: 0 1.5rem 0.75rem;
}

.sidebar-lang a {
  flex: 1;
  text-align: center;
  padding: 0.3rem 0;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  text-decoration: none;
  transition: all 0.15s ease;
}

.sidebar-lang a:hover {
  color: var(--accent-color);
  border-color: var(--accent-color);
  text-decoration: none;
}

.sidebar-lang a.active {
  background-color: var(--accent-color);
  color: var(--bg-white);
  border-color: var(--accent-color);
}

.sidebar-brand {
  display: block;
  padding: 0 1.5rem 1.5rem;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
  text-decoration: none;
}

.sidebar-brand:hover {
  text-decoration: none;
}

.brand-title {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-dark);
  letter-spacing: -0.02em;
}

.brand-subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-top: 0.25rem;
}

.nav-section {
  margin-bottom: 1.5rem;
}

.nav-section-title {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  padding: 0 1.5rem;
  margin-bottom: 0.5rem;
}

.nav-list {
  list-style: none;
}

.nav-list li a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 1.5rem;
  font-size: 0.92rem;
  color: var(--text-light);
  border-left: 3px solid transparent;
  transition: all 0.15s ease;
}

.nav-list li a:hover {
  background-color: var(--bg-light);
  color: var(--text-dark);
  text-decoration: none;
}

.nav-list li a[aria-current="page"],
.nav-list li a.active {
  background-color: var(--bg-light);
  color: var(--primary-color);
  border-left-color: var(--primary-color);
  font-weight: 500;
}

.nav-num {
  display: inline-block;
  min-width: 1.75rem;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* === Main content area === */
.main {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
  max-width: 100%;
}

/* === Hero (index page) === */
.hero {
  padding: 5rem 3rem 3rem;
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text-dark);
  margin-bottom: 1.25rem;
}

.hero-title em {
  font-style: normal;
  color: var(--primary-color);
}

.hero-title-accent {
  color: var(--text-light);
  font-weight: 500;
}

.hero-tagline {
  font-size: 1.15rem;
  color: var(--text-light);
  max-width: 700px;
  line-height: 1.7;
}

.hero-meta {
  margin-top: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: 'IBM Plex Mono', monospace;
}

.hero-meta span {
  color: var(--primary-color);
  font-weight: 600;
}

/* === Sub-page header === */
.page-header {
  padding: 4rem 3rem 2.5rem;
  background-color: var(--bg-white);
  border-bottom: 1px solid var(--border-color);
}

.page-eyebrow {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent-color);
  margin-bottom: 0.75rem;
  font-family: 'IBM Plex Mono', monospace;
}

.page-title {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-dark);
  margin-bottom: 0.75rem;
  line-height: 1.2;
}

.page-lede {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 720px;
}

/* === Article content === */
.content {
  padding: 3rem;
  max-width: 880px;
}

.content h2 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-dark);
  margin-top: 3rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
}

.content h2:first-child {
  margin-top: 0;
}

.content h3 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-top: 2.25rem;
  margin-bottom: 0.75rem;
}

.content h4 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
}

.content p {
  margin-bottom: 1rem;
  color: var(--text-light);
}

.content ul,
.content ol {
  margin: 0 0 1.25rem 1.5rem;
  color: var(--text-light);
}

.content li {
  margin-bottom: 0.4rem;
}

.content strong {
  color: var(--text-dark);
  font-weight: 600;
}

.content code {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.88em;
  background-color: var(--bg-code);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  padding: 0.1em 0.4em;
  color: var(--primary-color);
}

.content pre {
  background-color: var(--bg-code);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  overflow-x: auto;
  font-size: 0.88rem;
  line-height: 1.6;
  position: relative;
}

.content pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text-dark);
  font-size: inherit;
}

.content pre[data-lang]::before {
  content: attr(data-lang);
  position: absolute;
  top: 0.4rem;
  right: 0.75rem;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-family: 'IBM Plex Mono', monospace;
}

/* Inline syntax highlight spans inside <pre><code> */
.content pre .cmt { color: var(--syntax-comment); font-style: italic; }
.content pre .kw  { color: var(--syntax-keyword); font-weight: 600; }
.content pre .kw2 { color: var(--syntax-keyword2); font-weight: 500; }
.content pre .num { color: var(--syntax-number); }
.content pre .str { color: var(--syntax-string); }

/* === Copy button on code blocks === */
.content pre .copy-btn {
  position: absolute;
  top: 0.3rem;
  right: 0.4rem;
  z-index: 2;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.7rem;
  line-height: 1;
  padding: 0.3em 0.55em;
  color: var(--text-muted);
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 4px;
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.content pre:hover .copy-btn,
.content pre .copy-btn:focus-visible { opacity: 1; }
.content pre .copy-btn:hover { color: var(--accent-color); border-color: var(--accent-color); }
.content pre .copy-btn.copied { color: var(--syntax-string); border-color: var(--syntax-string); opacity: 1; }
/* Fade the language label on hover so it does not sit under the button */
.content pre[data-lang]::before { transition: opacity 0.15s ease; }
.content pre[data-lang]:hover::before { opacity: 0; }
/* Touch devices (no hover): keep the button visible, hide the label */
@media (hover: none) {
  .content pre .copy-btn { opacity: 0.7; }
  .content pre[data-lang]::before { opacity: 0; }
}

/* === Tables === */
.content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  overflow: hidden;
  font-size: 0.92rem;
}

.content thead {
  background-color: var(--bg-light);
}

.content th,
.content td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-light);
}

.content th {
  color: var(--text-dark);
  font-weight: 600;
}

.content tr:last-child td {
  border-bottom: none;
}

/* === TOC (in-page table of contents) === */
.toc {
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-left: 3px solid var(--primary-color);
  border-radius: 6px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2.5rem;
}

.toc-title {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary-color);
  margin-bottom: 0.75rem;
}

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

.toc li {
  margin-bottom: 0.3rem;
}

.toc a {
  color: var(--text-light);
  font-size: 0.93rem;
}

.toc a:hover {
  color: var(--primary-color);
}

/* === Cards (index landing) === */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0 2.5rem;
}

.card {
  display: block;
  padding: 1.25rem 1.5rem;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  transition: all 0.2s ease;
  color: inherit;
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent-color);
  text-decoration: none;
}

.card-num {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent-color);
  font-family: 'IBM Plex Mono', monospace;
  margin-bottom: 0.5rem;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-dark);
  margin-bottom: 0.4rem;
}

.card-desc {
  font-size: 0.88rem;
  color: var(--text-light);
  line-height: 1.55;
}

/* === Callouts: note / tip / warning / caution === */
.note,
.tip,
.warning,
.caution {
  border: 1px solid var(--border-color);
  border-left-width: 4px;
  border-radius: 6px;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
}

.note    { background-color: var(--note-bg);    border-left-color: var(--note-border); }
.tip     { background-color: var(--tip-bg);     border-left-color: var(--tip-border); }
.warning { background-color: var(--warning-bg); border-left-color: var(--warning-border); }
.caution { background-color: var(--caution-bg); border-left-color: var(--caution-border); }

.note-title {
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-dark);
  font-size: 0.95rem;
}

.note p,
.tip p,
.warning p,
.caution p {
  margin-bottom: 0.5rem;
  color: var(--text-light);
}

.note p:last-child,
.tip p:last-child,
.warning p:last-child,
.caution p:last-child {
  margin-bottom: 0;
}

.note pre,
.tip pre,
.warning pre,
.caution pre {
  margin: 0.75rem 0 0;
}

/* === Divider === */
.divider {
  height: 1px;
  background-color: var(--border-color);
  margin: 3rem 0;
}

/* === Prev / Next page nav === */
.page-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  padding: 0 3rem 3rem;
  max-width: 880px;
}

.page-nav a {
  display: block;
  padding: 1rem 1.25rem;
  background-color: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: inherit;
  transition: all 0.2s ease;
}

.page-nav a:hover {
  border-color: var(--accent-color);
  box-shadow: var(--shadow);
  text-decoration: none;
}

.page-nav .next {
  text-align: right;
}

.page-nav-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.2rem;
  font-family: 'IBM Plex Mono', monospace;
}

.page-nav-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-dark);
}

/* === Site footer === */
.site-footer {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.7;
}

/* === Mobile nav toggle === */
.mobile-nav-toggle {
  display: none;
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 200;
  background-color: var(--bg-white);
  color: var(--text-dark);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.55rem 0.85rem;
  font-family: 'IBM Plex Sans', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  cursor: pointer;
  box-shadow: var(--shadow);
}

/* === Responsive === */
@media (max-width: 900px) {
  .mobile-nav-toggle {
    display: block;
  }

  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.25s ease;
  }

  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }

  .main {
    margin-left: 0;
  }

  .hero,
  .page-header {
    padding: 4rem 1.25rem 2rem;
  }

  .hero-title {
    font-size: 2.2rem;
  }

  .page-title {
    font-size: 1.8rem;
  }

  .content {
    padding: 2rem 1.25rem;
  }

  .page-nav {
    grid-template-columns: 1fr;
    padding: 0 1.25rem 2rem;
  }
}