/* =====================================================
   FONTS
   ===================================================== */
@import url('https://fonts.googleapis.com/css2?family=Newsreader:ital,opsz,wght@0,6..72,200..800;1,6..72,200..800&family=Work+Sans:ital,wght@0,100..900;1,100..900&display=swap');

@font-face {
  font-family: 'SuperMaples';
  src: url('../assets/fonts/SuperMaples-2vR2w.ttf') format('truetype');
}

/* =====================================================
   DESIGN TOKENS
   ===================================================== */
:root {
  --si-stripe: linear-gradient(to right, #ef4444 25%, #fb923c 25%, #fb923c 50%, #22c55e 50%, #22c55e 75%, #3b82f6 75%);
  --si-headline: "Newsreader", "Times New Roman", "Songti SC", serif;
  --si-body:     "Work Sans", "Geneva", "Verdana", "Noto Sans SC", sans-serif;
  --si-code:     "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --si-surface:         #fff8f3;
  --si-surface-low:     #fff2e1;
  --si-surface-mid:     #fbecd8;
  --si-surface-high:    #f5e6d2;
  --si-surface-highest: #efe0cd;
  --si-surface-dim:     #e6d8c5;
  --si-surface-white:   #ffffff;
  --si-titlebar:        #dcdcdc;
  --si-outline:         #777777;
  --si-on-surface:      #221b0f;
  --si-on-surface-var:  #474747;
  --si-primary:         #343dff;
  --si-primary-ctn:     #e0e0ff;
  --si-secondary:       #8f4c35;
}


/* =====================================================
   COLOR SCHEME — Light
   ===================================================== */
[data-md-color-scheme="default"] {
  --md-default-bg-color: #fff8f3;
  --md-default-fg-color: #221b0f;
  --md-default-fg-color--light: #474747;
  --md-default-fg-color--lighter: #777777;
  --md-default-fg-color--lightest: rgba(34,27,15,0.08);
  --md-primary-fg-color: #f5f5f5;
  --md-primary-fg-color--light: #fbecd8;
  --md-primary-fg-color--dark: #e6d8c5;
  --md-accent-fg-color: #343dff;
  --md-accent-fg-color--transparent: rgba(52,61,255,0.12);
  --md-typeset-a-color: #343dff;
}

/* =====================================================
   COLOR SCHEME — Dark
   ===================================================== */
[data-md-color-scheme="slate"] {
  --md-default-bg-color: #11161d;
  --md-default-fg-color: #edf1f5;
  --md-default-fg-color--light: #c7d0d8;
  --md-default-fg-color--lighter: #8c98a3;
  --md-default-fg-color--lightest: rgba(237,241,245,0.08);
  --md-primary-fg-color: #1a1a1a;
  --md-accent-fg-color: #8cb3ff;
  --md-typeset-a-color: #8cb3ff;
}


/* =====================================================
   GLOBAL
   ===================================================== */
html, body, input, button { font-family: var(--si-body); }
body { background: var(--md-default-bg-color); }


/* =====================================================
   HEADER — retro top bar with signature stripe
   ===================================================== */
.md-header {
  background: #f5f5f5 !important;
  border-bottom: 2px solid #292524 !important;
  box-shadow: none !important;
  position: relative;
}
.md-header::after {
  content: ""; position: absolute; bottom: -2px; left: 0;
  width: 100%; height: 2px;
  background: var(--si-stripe);
  z-index: 10; pointer-events: none;
}
[data-md-color-scheme="slate"] .md-header {
  background: #1c1917 !important;
  border-color: #57534e !important;
}

.md-header__title {
  font-family: var(--si-headline) !important;
  font-size: 1.15rem !important;
  font-weight: 700 !important;
  color: #1c1917 !important;
}
[data-md-color-scheme="slate"] .md-header__title { color: #f5f5f4 !important; }

.md-header__button {
  color: #1c1917 !important;
  transition: none !important;
  border-radius: 0 !important;
}
[data-md-color-scheme="slate"] .md-header__button { color: #f5f5f4 !important; }
.md-header__button:hover {
  background: var(--si-primary) !important;
  color: #fff !important;
}

/* Header topic (breadcrumb) */
.md-header__topic { font-family: var(--si-body) !important; }
.md-header__topic .md-ellipsis {
  font-weight: 600 !important;
  letter-spacing: 0.02em !important;
}


/* =====================================================
   TABS — menu bar style
   ===================================================== */
.md-tabs {
  background: #f5f5f5 !important;
  border-bottom: 1px solid rgba(41,37,36,0.15) !important;
  box-shadow: none !important;
}
[data-md-color-scheme="slate"] .md-tabs {
  background: #1c1917 !important;
  border-color: rgba(255,255,255,0.08) !important;
}

.md-tabs__link {
  color: #292524 !important;
  font-family: var(--si-body) !important;
  font-size: 0.75rem !important;
  font-weight: 700 !important;
  letter-spacing: 0.08em !important;
  text-transform: uppercase !important;
  border-radius: 0 !important;
  transition: none !important;
}
[data-md-color-scheme="slate"] .md-tabs__link { color: #d6d3d1 !important; }
.md-tabs__link:hover {
  background: var(--si-primary) !important;
  color: #fff !important;
  opacity: 1 !important;
}
.md-tabs__link--active {
  background: var(--si-primary) !important;
  color: #fff !important;
  opacity: 1 !important;
}


/* =====================================================
   SEARCH
   ===================================================== */
.md-search__form {
  border: 1px solid var(--si-outline) !important;
  border-radius: 0 !important;
  background: #fff !important;
  box-shadow: none !important;
}
[data-md-color-scheme="slate"] .md-search__form {
  background: #292524 !important;
  border-color: #57534e !important;
}
.md-search__input { font-family: var(--si-body) !important; }


/* =====================================================
   LAYOUT — grid & sidebar
   ===================================================== */
.md-grid { max-width: 78rem; }
.md-main__inner { margin-top: 1rem; }

/* Left sidebar — warm surface */
.md-sidebar--primary {
  background: var(--si-surface-dim);
  border-right: 1px solid rgba(119,119,119,0.2);
}
[data-md-color-scheme="slate"] .md-sidebar--primary {
  background: #1e2430;
  border-color: rgba(255,255,255,0.06);
}

/* Right TOC sidebar */
.md-sidebar--secondary { border-left: 1px solid rgba(119,119,119,0.15); }
[data-md-color-scheme="slate"] .md-sidebar--secondary { border-color: rgba(255,255,255,0.06); }

.md-sidebar--primary .md-sidebar__scrollwrap,
.md-sidebar--secondary .md-sidebar__scrollwrap { padding-top: 0.75rem; }

.md-sidebar .md-nav__link {
  font-size: 0.78rem;
  font-family: var(--si-body);
  border-radius: 0;
  transition: none;
}
.md-sidebar .md-nav__link:hover {
  color: var(--si-primary);
}
.md-sidebar .md-nav__link--active {
  color: var(--si-primary);
  font-weight: 700;
}

/* Nav item styling — sharp edges */
.md-nav__item { border-radius: 0 !important; }
.md-nav__link { border-radius: 0 !important; }


/* =====================================================
   CONTENT CARD — the "Mac window" paper feel
   ===================================================== */
.md-content__inner {
  max-width: 52rem;
  margin-inline: auto;
  padding: 2.25rem clamp(1.1rem, 2vw, 2rem) 3rem;
  border: 1px solid var(--si-outline);
  background: var(--si-surface-white);
  box-shadow: 4px 4px 0 rgba(71,71,71,0.2);
  position: relative;
}
[data-md-color-scheme="slate"] .md-content__inner {
  background: #1a2230;
  border-color: #44403c;
  box-shadow: 4px 4px 0 rgba(0,0,0,0.4);
}

/* Signature stripe at top of content card */
.md-content__inner::before {
  content: "";
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 2px;
  background: var(--si-stripe);
}


/* =====================================================
   TYPOGRAPHY — editorial precision
   ===================================================== */
.md-typeset {
  font-family: var(--si-body);
  font-size: 0.84rem;
  line-height: 1.74;
}

/* Headlines — Newsreader serif */
.md-typeset h1, .md-typeset h2, .md-typeset h3, .md-typeset h4 {
  font-family: var(--si-headline);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--md-default-fg-color);
}
.md-typeset h1 {
  margin-bottom: 1rem;
  font-size: clamp(2.45rem, 4vw, 3.15rem);
}
.md-typeset h2 {
  margin-top: 2.8rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--si-outline);
  font-size: clamp(1.5rem, 2vw, 1.8rem);
}
.md-typeset h3 { margin-top: 2rem; font-size: 1.18rem; }

/* Links */
.md-typeset a {
  color: var(--si-primary);
  text-decoration-thickness: 0.1em;
  text-underline-offset: 0.16em;
}

/* Horizontal rules */
.md-typeset hr { border-bottom: 1px solid var(--si-outline); }

/* Inline code — sharp, technical */
.md-typeset code, .md-typeset pre code { font-family: var(--si-code); }
.md-typeset code {
  padding: 0.18em 0.4em;
  border: 1px solid var(--md-default-fg-color--lighter);
  border-radius: 0;
  background: rgba(34,27,15,0.04);
  font-size: 0.88em;
}
[data-md-color-scheme="slate"] .md-typeset code {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.15);
}

/* Code blocks — retro terminal */
.md-typeset pre {
  border: 1px solid var(--md-default-fg-color);
  border-radius: 0;
  box-shadow: 4px 4px 0 var(--md-default-fg-color);
  position: relative;
}
.md-typeset pre > code {
  padding: 1rem 1.1rem;
  border: none;
  background: transparent;
}

/* Copy button */
.md-clipboard { border-radius: 0 !important; }

/* Blockquote — scholarly aside */
.md-typeset blockquote {
  margin: 1.4rem 0;
  padding: 0.5rem 0 0.5rem 1rem;
  border-left: 4px solid var(--si-primary);
  background: rgba(52,61,255,0.03);
}
[data-md-color-scheme="slate"] .md-typeset blockquote {
  background: rgba(140,179,255,0.04);
}

/* Tables — sharp, printed feel */
.md-typeset table:not([class]) {
  border-radius: 0;
  border: 1px solid var(--md-default-fg-color);
  box-shadow: 4px 4px 0 var(--md-default-fg-color);
  border-collapse: collapse;
}
.md-typeset table:not([class]) th {
  background: var(--md-default-fg-color);
  color: #fff;
  border: 1px solid var(--md-default-fg-color);
  font-family: var(--si-body);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.md-typeset table:not([class]) td {
  border: 1px solid var(--md-default-fg-color);
}

/* Admonitions — Mac window style */
.md-typeset .admonition, .md-typeset details {
  border-radius: 0;
  border: 1px solid var(--md-default-fg-color);
  box-shadow: 4px 4px 0 var(--md-default-fg-color);
  font-family: var(--si-body);
}
.md-typeset .admonition-title, .md-typeset summary {
  font-weight: 600;
  border-bottom: 1px solid var(--md-default-fg-color);
  border-radius: 0;
  font-family: var(--si-body);
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0.04em;
}

/* Back to top */
.md-top {
  border-radius: 0;
  border: 1px solid var(--md-default-fg-color);
  box-shadow: 4px 4px 0 var(--md-default-fg-color);
  font-family: var(--si-body);
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  font-weight: 700;
}

/* Footer */
.md-footer { background: transparent; }
.md-footer__inner { font-family: var(--si-body); }
.md-footer-meta {
  background: var(--si-titlebar);
  border-top: 1px solid #292524;
}
[data-md-color-scheme="slate"] .md-footer-meta {
  background: #0a0908;
  border-color: #57534e;
}

/* Math */
.arithmatex, mjx-container { font-size: 1.02em; }

/* Comments */
#__comments { margin-top: 3.2rem; }
.giscus { margin-top: 1rem; }


/* =====================================================
   RESPONSIVE
   ===================================================== */
@media screen and (max-width: 76.1875em) {
  .md-content__inner { padding-inline: 1rem; }
}
@media screen and (max-width: 59.9375em) {
  .md-sidebar--primary { border-right: none; }
}
@media screen and (max-width: 44.9375em) {
  .md-content__inner {
    margin-top: 0.25rem;
    padding: 1.5rem 0.95rem 2.2rem;
  }
  .md-typeset h1 { font-size: 2rem; }
}