/* ============================================================
   Web3 Learning Wiki — design system
   Modern developer knowledge base · dark chrome + cyan accent
   ============================================================ */

/* ---------- Light theme tokens ---------- */
[data-md-color-scheme="default"] {
  --w3-bg: #ffffff;
  --w3-bg-subtle: #f4f8fb;
  --w3-bg-elev: #ffffff;
  --w3-fg: #0f1b2a;
  --w3-fg-muted: #47576b;
  --w3-border: #e2e9f0;
  --w3-accent: #0891b2;
  --w3-accent-strong: #0e7490;
  --w3-accent-soft: rgba(8, 145, 178, 0.09);
  --w3-code-bg: #0d1420;
  --w3-code-fg: #e6edf3;
  --w3-inline-bg: #e9f1f6;

  --md-default-bg-color: var(--w3-bg);
  --md-typeset-color: var(--w3-fg);
  --md-typeset-a-color: var(--w3-accent);
  --md-accent-fg-color: var(--w3-accent);
  --md-code-fg-color: var(--w3-code-fg);
  --md-code-bg-color: var(--w3-code-bg);
}

/* ---------- Dark theme tokens ---------- */
[data-md-color-scheme="slate"] {
  --w3-bg: #0a0e16;
  --w3-bg-subtle: #0f1520;
  --w3-bg-elev: #131b28;
  --w3-fg: #e8eef7;
  --w3-fg-muted: #9aa8bc;
  --w3-border: #1e2838;
  --w3-accent: #22d3ee;
  --w3-accent-strong: #22d3ee;
  --w3-accent-soft: rgba(34, 211, 238, 0.11);
  --w3-code-bg: #0d1420;
  --w3-code-fg: #e6edf3;
  --w3-inline-bg: #182231;

  --md-default-bg-color: var(--w3-bg);
  --md-typeset-color: var(--w3-fg);
  --md-typeset-a-color: var(--w3-accent);
  --md-accent-fg-color: var(--w3-accent);
  --md-code-fg-color: var(--w3-code-fg);
  --md-code-bg-color: var(--w3-code-bg);
}

/* ---------- Smooth scrolling & selection ---------- */
html { scroll-behavior: smooth; }
::selection { background: var(--w3-accent); color: #04141a; }

body {
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
.md-typeset, .md-nav {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
    sans-serif;
}

/* ---------- Type scale (larger, readable) ---------- */
.md-typeset { font-size: 0.94rem; line-height: 1.8; }
.md-typeset h1 {
  font-weight: 800;
  font-size: 2.4rem;
  letter-spacing: -0.025em;
  color: var(--w3-fg);
  margin-bottom: 1.2rem;
}
.md-typeset h2 {
  font-weight: 750;
  font-size: 1.6rem;
  letter-spacing: -0.015em;
  color: var(--w3-fg);
  margin-top: 2.6rem;
  padding-bottom: 0.35rem;
  border-bottom: 1px solid var(--w3-border);
}
.md-typeset h3 {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--w3-fg);
  margin-top: 2rem;
}
.md-typeset a {
  text-decoration: none;
  transition: color 0.18s ease;
}
.md-typeset a:hover { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Layout widths (wider) ---------- */
.md-grid { max-width: 1500px; }
.md-content__inner { max-width: 980px; margin: 0 auto; }

/* ---------- Header & tabs: always dark ---------- */
.md-header {
  background: #0a0e16 !important;
  color: #e8eef7;
  border-bottom: 1px solid #1e2838;
}
.md-header::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  background: linear-gradient(90deg, #22d3ee, #0891b2 45%, rgba(8,145,178,0));
}
.md-header__title, .md-header__topic { color: #f4f8fc; font-weight: 700; }
.md-header .md-header__button,
.md-header .md-header__ellipsis .md-header__button { color: #b8c4d4; }
.md-header .md-header__button:hover { color: #22d3ee; }

.md-tabs {
  background: #0a0e16 !important;
  color: #c4d0e0;
  border-bottom: 1px solid #161e2b;
}
.md-tabs__link {
  color: #94a3b8;
  font-weight: 650;
  font-size: 0.74rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  transition: color 0.18s ease;
}
.md-tabs__link--active, .md-tabs__link:hover { color: #22d3ee; }

/* search inside dark header */
.md-header .md-search__form { background: #161f2d; border-radius: 8px; }
.md-header .md-search__input { color: #eef4fa; }
.md-header .md-search__icon { color: #8fa0b6; }
.md-search__output { background: #0f1520; }
.md-search__output .md-search-result__link { color: #d7e1ee; }
.md-search__output .md-search-result__link:hover { background: #16202e; }

/* ---------- Sidebar ---------- */
.md-nav { font-size: 0.82rem; line-height: 1.7; }
.md-nav__title { font-weight: 700; color: var(--w3-fg); }
.md-nav__link { color: var(--w3-fg-muted); transition: color 0.18s ease; }
.md-nav__link:hover { color: var(--w3-accent); }
.md-nav__link--active { color: var(--w3-accent); font-weight: 700; }
.md-nav__item .md-nav__link--active {
  border-left: 2px solid var(--w3-accent);
  padding-left: 0.7rem;
  margin-left: -0.75rem;
}

/* ---------- Right TOC ---------- */
.md-nav--secondary .md-nav__link { border-left: 1px solid var(--w3-border); }
.md-nav--secondary .md-nav__link--active { border-left: 2px solid var(--w3-accent); }

/* ---------- Code blocks (always dark) ---------- */
.md-typeset .highlight,
.md-typeset pre {
  background: var(--w3-code-bg);
  color: var(--w3-code-fg);
  border-radius: 12px;
  border: 1px solid #223047;
}
.md-typeset pre { padding: 1rem 1.1rem; }
.md-typeset .highlight pre,
.md-typeset pre > code {
  background: transparent;
  border: 0;
  color: var(--w3-code-fg);
}
.md-typeset pre > code { padding: 0; }
.md-typeset .md-code__content { background: transparent !important; color: var(--w3-code-fg); }
.md-typeset .md-code__nav { background: transparent !important; }
.md-typeset .md-code__button { background: transparent !important; color: #8b97a7 !important; }
.md-typeset .md-code__button:hover { color: var(--w3-accent) !important; }
.md-typeset .highlight .c, .md-typeset .highlight .c1 { color: #7d8a9c; font-style: normal; }
.md-typeset .highlight .k, .md-typeset .highlight .kd { color: #ff7b72; }
.md-typeset .highlight .s, .md-typeset .highlight .s1, .md-typeset .highlight .s2 { color: #a5d6ff; }
.md-typeset .highlight .nf, .md-typeset .highlight .nc { color: #d2a8ff; }
.md-typeset .highlight .mi, .md-typeset .highlight .mf { color: #79c0ff; }
.md-typeset .highlight .o, .md-typeset .highlight .p { color: #c9d1d9; }
.md-typeset .md-clipboard { color: #8b97a7; }

/* Inline code */
.md-typeset code:not(pre code) {
  background: var(--w3-inline-bg);
  color: var(--w3-accent-strong);
  border-radius: 6px;
  padding: 0.12em 0.44em;
  font-size: 0.86em;
}

/* ---------- Tables ---------- */
.md-typeset table:not([class]) {
  border-radius: 12px;
  border: 1px solid var(--w3-border);
  overflow: hidden;
  display: table;
  width: 100%;
  font-size: 0.85rem;
}
.md-typeset table:not([class]) th {
  background: var(--w3-bg-subtle);
  color: var(--w3-fg);
  font-weight: 700;
  border-bottom: 1px solid var(--w3-border);
  padding: 0.7rem 0.9rem;
}
.md-typeset table:not([class]) td {
  border-bottom: 1px solid var(--w3-border);
  padding: 0.65rem 0.9rem;
}
.md-typeset table:not([class]) tbody tr:last-child td { border-bottom: none; }
.md-typeset table:not([class]) tbody tr { transition: background 0.15s ease; }
.md-typeset table:not([class]) tbody tr:hover { background: var(--w3-accent-soft); }

/* ---------- Blockquote ---------- */
.md-typeset blockquote {
  border-left: 3px solid var(--w3-accent);
  background: var(--w3-accent-soft);
  border-radius: 0 10px 10px 0;
  padding: 0.7rem 1.1rem;
  color: var(--w3-fg);
  font-style: normal;
}

/* ---------- Admonitions ---------- */
.md-typeset .admonition,
.md-typeset details {
  border-radius: 12px;
  border: 1px solid var(--w3-border);
  font-size: 0.86rem;
}

/* ---------- Footer ---------- */
.md-footer-meta { background: #0a0e16; border-top: 1px solid #1e2838; }
.md-footer-meta__inner { color: #94a3b8; }
.md-footer__link { color: #94a3b8; }
.md-footer__link:hover { color: #22d3ee; }

/* ---------- Reading progress ---------- */
.w3-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, #22d3ee, #0891b2);
  z-index: 2000;
}

/* ---------- Homepage hero ---------- */
.w3-hero {
  position: relative;
  margin: 1.4rem 0 0.5rem;
  padding: 2.8rem 2.4rem;
  border: 1px solid var(--w3-border);
  border-radius: 18px;
  background:
    radial-gradient(900px 320px at 12% -10%, var(--w3-accent-soft), transparent 60%),
    var(--w3-bg-elev);
  overflow: hidden;
}
.w3-hero .eyebrow {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  color: var(--w3-accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.1rem;
}
.w3-hero h1 {
  font-size: 3.2rem;
  font-weight: 850;
  letter-spacing: -0.035em;
  line-height: 1.05;
  margin-bottom: 1.1rem;
}
.w3-hero .tagline {
  font-size: 1.12rem;
  color: var(--w3-fg-muted);
  line-height: 1.75;
  max-width: 720px;
}
.w3-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 2rem 0 0.4rem;
}
.w3-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.62rem 1.15rem;
  border-radius: 10px;
  font-weight: 650;
  font-size: 0.88rem;
  border: 1px solid var(--w3-border);
  color: var(--w3-fg);
  transition: transform 0.2s cubic-bezier(0.2,0.8,0.2,1), box-shadow 0.2s,
    border-color 0.2s, color 0.2s, background 0.2s;
}
.w3-btn:hover {
  text-decoration: none;
  border-color: var(--w3-accent);
  color: var(--w3-accent);
  transform: translateY(-2px);
}
.w3-btn--primary { background: var(--w3-accent); border-color: var(--w3-accent); color: #04141a; }
[data-md-color-scheme="default"] .w3-btn--primary { color: #ffffff; }
[data-md-color-scheme="slate"] .w3-btn--primary { color: #04141a; }
.w3-btn--primary:hover { filter: brightness(1.08); color: inherit; }

.w3-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 1.6rem;
  margin-top: 1.8rem;
  font-size: 0.84rem;
  color: var(--w3-fg-muted);
}
.w3-meta-row strong { color: var(--w3-fg); font-weight: 700; }

/* ---------- Section labels ---------- */
.w3-section-label {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--w3-fg-muted);
  margin: 3.2rem 0 1.1rem;
}

/* ---------- Learning path cards ---------- */
.w3-paths {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}
.w3-card {
  display: block;
  border: 1px solid var(--w3-border);
  border-radius: 14px;
  padding: 1.2rem 1.3rem;
  color: var(--w3-fg);
  background: var(--w3-bg-elev);
  transition: transform 0.25s cubic-bezier(0.2,0.8,0.2,1), box-shadow 0.25s,
    border-color 0.25s;
}
.w3-card:hover {
  text-decoration: none;
  border-color: var(--w3-accent);
  transform: translateY(-4px);
  box-shadow: 0 16px 34px -18px var(--w3-accent);
}
.w3-card .num {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.8rem;
  color: var(--w3-accent);
}
.w3-card .title { font-weight: 700; font-size: 1.05rem; margin: 0.4rem 0 0.35rem; }
.w3-card .desc { font-size: 0.86rem; color: var(--w3-fg-muted); line-height: 1.6; }

/* ---------- Browse tiles ---------- */
.w3-tiles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.9rem;
}
.w3-tile {
  border: 1px solid var(--w3-border);
  border-radius: 12px;
  padding: 1rem 1.1rem;
  color: var(--w3-fg);
  background: var(--w3-bg-elev);
  transition: transform 0.22s cubic-bezier(0.2,0.8,0.2,1), border-color 0.22s, color 0.22s;
}
.w3-tile:hover {
  text-decoration: none;
  border-color: var(--w3-accent);
  color: var(--w3-accent);
  transform: translateY(-3px);
}
.w3-tile .t { font-weight: 700; font-size: 0.96rem; }
.w3-tile .d { font-size: 0.82rem; color: var(--w3-fg-muted); margin-top: 0.25rem; }

/* ---------- Course cards (courses page) ---------- */
.w3-courses { display: grid; grid-template-columns: repeat(auto-fill, minmax(330px, 1fr)); gap: 1rem; }
.w3-course {
  display: flex; flex-direction: column;
  border: 1px solid var(--w3-border);
  border-radius: 14px;
  padding: 1.25rem 1.3rem;
  background: var(--w3-bg-elev);
  transition: transform 0.25s cubic-bezier(0.2,0.8,0.2,1), box-shadow 0.25s, border-color 0.25s;
}
.w3-course:hover { border-color: var(--w3-accent); transform: translateY(-4px); box-shadow: 0 16px 34px -18px var(--w3-accent); }
.w3-course .meta {
  display: flex; flex-wrap: wrap; gap: 0.4rem; align-items: center;
  font-family: "JetBrains Mono", monospace; font-size: 0.72rem; color: var(--w3-fg-muted);
  margin-bottom: 0.6rem;
}
.w3-course .tag {
  border: 1px solid var(--w3-border); border-radius: 999px; padding: 0.05rem 0.55rem;
}
.w3-course .tag.lvl { color: var(--w3-accent); border-color: var(--w3-accent); }
.w3-course .name { font-weight: 750; font-size: 1.12rem; color: var(--w3-fg); }
.w3-course .blurb { font-size: 0.86rem; color: var(--w3-fg-muted); line-height: 1.6; margin: 0.45rem 0 1rem; flex: 1; }
.w3-course .go {
  margin-top: auto; font-weight: 700; font-size: 0.86rem; color: var(--w3-accent);
}
.w3-course:hover .go { text-decoration: underline; text-underline-offset: 3px; }

/* ---------- Media: images / diagrams scale ---------- */
.md-typeset img, .md-typeset svg, .md-typeset .mermaid { max-width: 100%; height: auto; }
.md-typeset .mermaid { overflow-x: auto; }

/* ---------- Scrollbars ---------- */
* { scrollbar-width: thin; scrollbar-color: var(--w3-border) transparent; }
*::-webkit-scrollbar { width: 9px; height: 9px; }
*::-webkit-scrollbar-thumb { background: var(--w3-border); border-radius: 9px; }
*::-webkit-scrollbar-thumb:hover { background: var(--w3-accent); }

/* ---------- Reveal on scroll ---------- */
.w3-reveal { opacity: 0; transform: translateY(16px); transition: opacity .5s ease, transform .5s cubic-bezier(0.2,0.8,0.2,1); }
.w3-reveal.is-visible { opacity: 1; transform: none; }

/* ---------- Mobile ---------- */
@media screen and (max-width: 76.1875em) {
  .md-nav__item .md-nav__link--active { border-left: none; padding-left: 0; margin-left: 0; }
}
@media screen and (max-width: 44.984em) {
  .w3-hero { padding: 2rem 1.4rem; }
  .w3-hero h1 { font-size: 2.3rem; }
  .w3-paths, .w3-courses, .w3-tiles { grid-template-columns: 1fr; }
  .md-content__inner { max-width: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .w3-reveal { opacity: 1; transform: none; }
}