/* ============================================================
   Tennis Future Lab — "Lannino" Theme
   Applied site-wide as an override layer loaded after each
   page's own <style> block. Warm cream paper, burnt-orange/rust
   accent, thin geometric display headings, generous whitespace,
   a vertical-divider accent motif, quiet CSS-only motion, and a
   tennis-ball cursor on interactive elements. Component-specific
   diagrams/cards inside individual chapters are left alone; this
   file only touches the shared reading chrome (masthead, body
   copy, nav, footer) — existing nav markup/structure is untouched.
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Jost:ital,wght@0,200;0,300;0,400;0,500;0,600;1,300&family=DM+Sans:ital,wght@0,300;0,400;0,500;1,400&family=Space+Mono:wght@400&display=swap');

:root {
  --paper: #fff2e0;
  --paper-warm: #fbe9d3;
  --ink: #2a1f14;
  --muted: #8a7a68;
  --divider: #e8d3b3;
  --accent: #c2530f;
  --accent-soft: rgba(194, 83, 15, 0.35);
  --cursor-ball: url('../images/tennis-ball-cursor.svg') 16 16, pointer;
}

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  background: var(--paper) !important;
  color: var(--ink) !important;
  font-family: 'DM Sans', 'Inter', sans-serif !important;
  font-size: 17px !important;
  line-height: 1.75 !important;
  -webkit-font-smoothing: antialiased;
  animation: tfl-fade-up 0.6s ease-out both;
}

@keyframes tfl-fade-up {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── reading column ─── */
.content-wrap,
.container {
  max-width: 760px !important;
  padding-left: 28px !important;
  padding-right: 28px !important;
}

p, li { color: var(--ink); }
p { margin-bottom: 1.3em !important; }

a {
  color: var(--accent);
  text-decoration-color: var(--accent-soft);
  text-underline-offset: 3px;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}
a:hover { text-decoration-color: var(--accent); }

a, button, .page-nav a, .lang-card, .book-card a, .site-structure a {
  cursor: var(--cursor-ball);
}

/* ─── masthead: quiet title page with a vertical divider accent ───
   Centered to match the same 900px column that .content-wrap,
   .page-nav, and footer already use — the masthead's own inline
   <style> block has no max-width/margin:auto on its tag/h1/subtitle,
   so without this they sit flush against the padding edge (left-
   aligned) while the rest of the page is centered. ─── */
.masthead {
  background: var(--paper) !important;
  color: var(--ink) !important;
  padding: 80px 28px 44px !important;
  border-bottom: 1px solid var(--divider);
  overflow: visible !important;
  position: relative;
  text-align: center !important;
}
.masthead::before, .masthead::after { display: none !important; content: none !important; }
.masthead .tag,
.section-label {
  font-family: 'Space Mono', monospace !important;
  font-size: 11px !important;
  letter-spacing: 2.5px !important;
  color: var(--muted) !important;
  text-transform: uppercase;
}
.masthead h1,
.masthead .subtitle,
.masthead p.subtitle {
  max-width: 900px !important;
  margin-left: auto !important;
  margin-right: auto !important;
}
.masthead .subtitle,
.masthead p.subtitle {
  color: var(--muted) !important;
  font-family: 'DM Sans', sans-serif !important;
  font-style: italic;
  font-weight: 400 !important;
}

/* ─── headings: thin, geometric, display-weight — restrained by size ─── */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Jost', 'DM Sans', sans-serif !important;
  color: var(--ink) !important;
  font-weight: 300 !important;
  letter-spacing: -0.01em;
}
h1 {
  font-size: clamp(2.1rem, 4.5vw, 3rem) !important;
  line-height: 1.15 !important;
  padding-left: 20px;
  border-left: 2px solid var(--accent);
}
/* the left-border accent reads oddly on a centered masthead title —
   drop it there, keep it for in-column reading h1s */
.masthead h1 {
  padding-left: 0 !important;
  border-left: none !important;
}
h2 { font-size: clamp(1.5rem, 3vw, 2rem) !important; margin-top: 2.4em !important; font-weight: 400 !important; }
h3 { font-size: 1.3rem !important; margin-top: 1.8em !important; font-weight: 400 !important; }

.lead {
  font-family: 'DM Sans', sans-serif !important;
  font-size: 1.15rem !important;
  font-weight: 300 !important;
  font-style: italic;
  color: var(--muted) !important;
  border-bottom: 1px solid var(--divider) !important;
  background: none !important;
}

/* ─── quotes ─── */
.pullquote, blockquote {
  border-left: 2px solid var(--accent) !important;
  background: none !important;
  padding: 4px 0 4px 24px !important;
  margin: 2em 0 !important;
}
.pullquote p, blockquote p {
  font-family: 'Jost', sans-serif !important;
  font-weight: 300 !important;
  font-style: italic;
  color: var(--ink) !important;
}

/* ─── tables: hairline, no zebra/shadow ─── */
table { border-collapse: collapse; width: 100%; margin: 1.5em 0; }
th, td { border-bottom: 1px solid var(--divider); padding: 10px 12px; text-align: left; }
th { font-family: 'Space Mono', monospace; font-size: 12px; letter-spacing: 1px; text-transform: uppercase; color: var(--muted); }

/* ─── page navigation: quiet, like turning a page (markup unchanged) ─── */
nav.page-nav, .page-nav {
  border-top: 1px solid var(--divider) !important;
  border-bottom: 1px solid var(--divider) !important;
  background: none !important;
  font-family: 'Space Mono', monospace !important;
  font-size: 12px !important;
}
nav.page-nav a, .page-nav a {
  color: var(--muted) !important;
  text-decoration: none !important;
  font-weight: 400 !important;
  transition: color 0.2s ease, transform 0.2s ease;
  display: inline-block;
}
nav.page-nav a:hover, .page-nav a:hover { color: var(--accent) !important; transform: translateY(-1px); }

/* ─── footer ─── */
footer {
  background: var(--paper) !important;
  color: var(--muted) !important;
  border-top: 1px solid var(--divider);
  font-family: 'Space Mono', monospace !important;
  font-size: 11px !important;
  letter-spacing: 0.5px;
}

/* ─── catalog / index cards: hairline list, not boxed cards ─── */
.book-card {
  background: none !important;
  border: none !important;
  border-bottom: 1px solid var(--divider) !important;
  border-radius: 0 !important;
  padding: 24px 0 !important;
  transition: padding-left 0.25s ease, border-color 0.25s ease;
}
.book-card:hover { padding-left: 8px !important; border-color: var(--accent) !important; }
.book-card h3, .book-card h3 a { font-family: 'Jost', sans-serif !important; font-weight: 400 !important; }
.book-card a { color: var(--accent) !important; }

/* ─── homepage language cards: lift + accent-glow on hover ─── */
.lang-card {
  background: var(--paper-warm) !important;
  border: 1px solid var(--divider) !important;
  border-radius: 2px !important;
  transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease !important;
}
.lang-card:hover {
  transform: translateY(-4px) !important;
  border-color: var(--accent) !important;
  box-shadow: 0 12px 28px -16px var(--accent-soft);
}
.lang-card h3 { font-family: 'Jost', sans-serif !important; font-weight: 400 !important; }

/* ─── homepage site-structure list: hairline rows, not boxed cards ─── */
.site-structure li {
  background: none !important;
  border: none !important;
  border-bottom: 1px solid var(--divider) !important;
  border-radius: 0 !important;
  padding: 16px 4px !important;
  transition: padding-left 0.25s ease;
}
.site-structure li:hover { padding-left: 8px !important; }

/* ─── staggered entrance for headings within the reading column ─── */
.content-wrap > h1, .container > h1,
.content-wrap > h2, .container > h2 {
  animation: tfl-fade-up 0.7s ease-out both;
}