/* ============================================================
   style.css — shared styles for the entire site
   ============================================================ */

/* ── Google Font: Ubuntu ── */
@import url('https://fonts.googleapis.com/css2?family=Ubuntu:wght@400;700&display=swap');

/* ── Reset ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── Tokens ── */
:root {
  --bg:         #ffffff;
  --fg:         #000000;
  --btn-radius: 999px;
  --tab-radius: 6px;
  --font:       'Ubuntu', sans-serif;
  --transition: 0.15s ease;
  --topbar-h:   220px;   /* height of the logo bar */
  --footer-h:   52px;   /* height of the footer */
}

/* ── Base ── */
html {
  font-size: 18px;
  background: var(--bg);
  color: var(--fg);
}

body {
  font-family: var(--font);
  font-weight: 400;
  min-height: 100vh;
  text-transform: lowercase;
  /* make room for the fixed logo bar at top and footer at bottom */
  padding-top: var(--topbar-h);
  padding-bottom: var(--footer-h);
}

a {
  color: inherit;
  text-decoration: none;
}

/* ── Utility: visually hidden (accessibility) ── */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* ============================================================
   LOGO BAR — fixed top, every non-viewer page
   ============================================================ */
.site-topbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topbar-h);
  background: var(--bg);
  border-bottom: 2px solid var(--fg);
  display: flex;
  align-items: center;
  padding: 0 1.5rem;
  z-index: 200;
}

.site-logo {
  display: block;
  height: 160px;   /* logo image height — adjust if needed */
  width: auto;
}

/* ============================================================
   FOOTER — fixed bottom, every non-viewer page
   ============================================================ */
.site-footer {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  height: var(--footer-h);
  background: var(--bg);
  border-top: 2px solid var(--fg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 200;
}

.site-footer .copyright {
  font-family: var(--font);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: lowercase;
  color: var(--fg);
}

.site-footer .ig-link {
  display: flex;
  align-items: center;
}

.site-footer .ig-link img {
  height: 30px;
  width: 30px;
  display: block;
}

/* ============================================================
   BACK BUTTON
   ============================================================ */
.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4em;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 700;
  text-transform: lowercase;
  border: 2.5px solid var(--fg);
  border-radius: var(--btn-radius);
  padding: 0.45em 1.2em;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  text-decoration: none;
}
.back-btn:hover,
.back-btn:focus-visible {
  background: var(--fg);
  color: var(--bg);
  outline: none;
}

/* ============================================================
   PAGE: NAV (index / category)
   ============================================================ */
.nav-page {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - var(--topbar-h) - var(--footer-h));
  padding: 3rem 1.5rem;
  gap: 1.2rem;
}

.nav-page .back-wrap {
  align-self: flex-start;
  margin-bottom: 1rem;
}

.nav-btn {
  display: block;
  width: min(420px, 100%);
  font-family: var(--font);
  font-size: 1.45rem;
  font-weight: 700;
  text-transform: lowercase;
  text-align: center;
  border: 2.5px solid var(--fg);
  border-radius: var(--btn-radius);
  padding: 0.85em 2em;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  letter-spacing: 0.01em;
  text-decoration: none;
}
.nav-btn:hover,
.nav-btn:focus-visible {
  background: var(--fg);
  color: var(--bg);
  outline: none;
}

/* ============================================================
   PAGE: CHAPTER LIST
   ============================================================ */
.chapter-page {
  display: flex;
  flex-direction: column;
  min-height: calc(100vh - var(--topbar-h) - var(--footer-h));
  padding: 3rem 2rem;
}

.chapter-page .back-wrap {
  margin-bottom: 2rem;
}

.chapter-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  width: 100%;
}

.chapter-tab {
  display: flex;
  align-items: center;
  width: 100%;
  font-family: var(--font);
  font-size: 1.3rem;
  font-weight: 700;
  text-transform: lowercase;
  border: 2.5px solid var(--fg);
  border-radius: var(--tab-radius);
  padding: 0.75em 1.4em;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  text-decoration: none;
  box-sizing: border-box;
}
.chapter-tab:hover,
.chapter-tab:focus-visible {
  background: var(--fg);
  color: var(--bg);
  outline: none;
}

.chapter-tab .ch-arrow {
  margin-left: auto;
  font-size: 1.1em;
  transition: transform var(--transition);
}
.chapter-tab:hover .ch-arrow {
  transform: translateX(4px);
}

/* ============================================================
   PAGE: PDF VIEWER
   The viewer manages its own top/bottom bars — override body padding
   ============================================================ */
body.viewer-body {
  padding-top: 0;
  padding-bottom: 0;
}

.viewer-page {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  background: #1a1a1a;
}

.viewer-topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1.2rem;
  background: var(--bg);
  border-bottom: 2px solid var(--fg);
  flex-shrink: 0;
  gap: 1rem;
}

.viewer-topbar .back-btn {
  font-size: 0.9rem;
  padding: 0.35em 1em;
  flex-shrink: 0;
}

.viewer-topbar .page-counter {
  font-family: var(--font);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: lowercase;
  white-space: nowrap;
  color: var(--fg);
}

/* viewer footer strip — copyright + instagram */
.viewer-footer-strip {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1rem;
  background: var(--bg);
  border-top: 1px solid var(--fg);
  height: 36px;
  flex-shrink: 0;
}

.viewer-footer-strip .copyright {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: lowercase;
}

.viewer-footer-strip .ig-link img {
  height: 22px;
  width: 22px;
  display: block;
}

.viewer-canvas-area {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  /* extra bottom padding so content clears the fixed bottom bar */
  padding: 1.5rem 1rem 5rem;
  gap: 1rem;
}

.viewer-canvas-area canvas {
  display: block;
  max-width: 100%;
  background: #fff;
  box-shadow: 0 2px 20px rgba(0,0,0,0.5);
}

.viewer-bottombar {
  position: fixed;
  bottom: 36px; /* sit above the footer strip */
  left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background: var(--bg);
  border-top: 2px solid var(--fg);
  gap: 0.5rem;
  flex-shrink: 0;
}

.viewer-btn {
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 700;
  text-transform: lowercase;
  border: 2.5px solid var(--fg);
  border-radius: var(--btn-radius);
  padding: 0.5em 1.2em;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.viewer-btn:hover:not(:disabled),
.viewer-btn:focus-visible:not(:disabled) {
  background: var(--fg);
  color: var(--bg);
  outline: none;
}
.viewer-btn:disabled {
  opacity: 0.28;
  cursor: default;
}

.viewer-page-btns {
  display: flex;
  gap: 0.5rem;
}

/* ── Responsive ── */
@media (max-width: 520px) {
  .nav-btn      { font-size: 1.15rem; }
  .chapter-tab  { font-size: 1.05rem; }
  .viewer-btn   { font-size: 0.85rem; padding: 0.45em 0.9em; }
  .site-logo    { height: 28px; }
}