/* ==========================================================================
   components.css — buttons, badges, cards, header, mega menu, mobile menu,
   footer, accordion, forms. Tokens only (§3); no raw hex here.
   ========================================================================== */

/* --- Buttons (§4) --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-pill);
  font-weight: 600;
  font-size: var(--fs-base);
  line-height: 1.2;
  text-decoration: none;
  border: 1px solid transparent;
  transition: background-color var(--duration-fast) var(--ease),
    color var(--duration-fast) var(--ease),
    border-color var(--duration-fast) var(--ease),
    transform var(--duration-fast) var(--ease),
    box-shadow var(--duration-fast) var(--ease);
  white-space: nowrap;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn--primary { background: var(--color-accent); color: var(--color-text-inverse); }
.btn--primary:hover { background: var(--color-accent-hover); }
.btn--secondary { background: transparent; border-color: var(--color-text-inverse); color: var(--color-text-inverse); }
.btn--secondary:hover { background: var(--color-text-inverse); color: var(--color-text); }
.btn--secondary--dark { border-color: var(--color-text); color: var(--color-text); }
.btn--secondary--dark:hover { background: var(--color-text); color: var(--color-text-inverse); }
.btn--sm { min-height: 40px; padding: var(--space-2) var(--space-4); font-size: var(--fs-sm); }

/* Text link with arrow that nudges 4px on hover */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  color: var(--color-accent);
}
.link-arrow .arrow { transition: transform var(--duration-fast) var(--ease); }
.link-arrow:hover { text-decoration: none; }
.link-arrow:hover .arrow { transform: translateX(4px); }
.on-dark .link-arrow { color: var(--color-text-inverse); }

/* --- Badges (§4) --- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px var(--space-2);
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  line-height: 1.4;
  white-space: nowrap;
}
.badge--level { background: var(--color-surface); color: var(--color-text); border: 1px solid var(--color-surface-strong); }
.badge--free { background: var(--color-accent); color: var(--color-text-inverse); }
.badge--soon { background: var(--color-bg-dark); color: var(--color-text-inverse); }
.badge--tag { background: var(--color-surface); color: var(--color-text-muted); border: 1px solid var(--color-surface-strong); }

/* --- Cards (§4) --- */
.card {
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
  border: 1px solid var(--color-surface-strong);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--duration-fast) var(--ease), box-shadow var(--duration-fast) var(--ease);
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); }
.card__media { aspect-ratio: 16 / 9; overflow: hidden; background: var(--color-surface); }
.card__media img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--duration-med) var(--ease); }
.card:hover .card__media img { transform: scale(1.03); }
.card__body { display: flex; flex-direction: column; gap: var(--space-2); padding: var(--space-4); flex: 1; }
.card__tags { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.card__title { font-size: var(--fs-md); font-weight: 600; line-height: 1.3; }
.card__title a:hover { color: var(--color-accent); text-decoration: none; }
.card__meta { font-size: var(--fs-sm); color: var(--color-text-muted); }
.card__foot { margin-top: auto; padding-top: var(--space-2); display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.card__foot .link-arrow, .card__price { white-space: nowrap; }
.card__price { font-weight: 700; }

/* Category card */
.cat-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  padding: var(--space-5);
  background: var(--color-bg);
  border: 1px solid var(--color-surface-strong);
  border-radius: var(--radius-md);
  transition: transform var(--duration-fast) var(--ease), box-shadow var(--duration-fast) var(--ease);
}
.cat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-card); text-decoration: none; }
.cat-card h3 { font-size: var(--fs-md); }
.cat-card p { color: var(--color-text-muted); font-size: var(--fs-base); margin: 0; }
.cat-card .cat-card__count { font-size: var(--fs-sm); font-weight: 700; color: var(--color-accent); text-transform: uppercase; letter-spacing: 0.04em; }

/* Stat card */
.stat-card { padding: var(--space-5); background: var(--color-bg); border: 1px solid var(--color-surface-strong); border-radius: var(--radius-md); }
.stat-card__num { font-size: clamp(2rem, 4vw, 3rem); font-weight: 700; line-height: 1; color: var(--color-accent); }
.stat-card h3 { margin-top: var(--space-2); font-size: var(--fs-md); }
.stat-card p { color: var(--color-text-muted); margin: var(--space-2) 0 0; }

/* Book card (portrait cover) */
.book-card { display: flex; flex-direction: column; gap: var(--space-3); }
.book-card__cover { border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--color-surface-strong); aspect-ratio: 3 / 4; background: var(--color-bg-dark); }
.book-card__cover img { width: 100%; height: 100%; object-fit: contain; transition: transform var(--duration-med) var(--ease); }
.book-card:hover .book-card__cover img { transform: scale(1.03); }
.book-card h3 { font-size: var(--fs-md); }
.book-card p { color: var(--color-text-muted); margin: 0; }

/* --- Announcement bar (§4) --- */
.announce {
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  font-size: var(--fs-sm);
  text-align: center;
  padding: var(--space-2) var(--content-pad);
  min-height: var(--announcement-height);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
}
.announce a { color: var(--color-text-inverse); font-weight: 600; }
.announce a:hover { color: var(--color-text-inverse-muted); }

/* --- Header (§4) --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}
.site-header.scrolled { box-shadow: 0 4px 24px rgba(0, 0, 0, 0.35); }
.header-inner {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  height: var(--header-height);
}
.brand { display: flex; align-items: center; flex-shrink: 0; }
.brand img { height: 40px; width: auto; filter: brightness(0) invert(1); }
.brand:hover { text-decoration: none; }

.main-nav { display: flex; align-items: center; gap: var(--space-1); margin-left: var(--space-4); }
.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: var(--space-2) var(--space-3);
  font-size: var(--fs-base);
  font-weight: 600;
  color: var(--color-text-inverse);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}
.nav-link:hover { text-decoration: none; background: rgba(255, 255, 255, 0.1); }
.nav-link[aria-expanded="true"] { background: rgba(255, 255, 255, 0.1); }
.nav-link .chev { transition: transform var(--duration-fast) var(--ease); font-size: 11px; }
.nav-link[aria-expanded="true"] .chev { transform: rotate(180deg); }

.header-actions { margin-left: auto; display: flex; align-items: center; gap: var(--space-3); }
.header-actions .login-link { font-weight: 600; color: var(--color-text-inverse); white-space: nowrap; }

/* Mega menu — anchored to the sticky .site-header (nearest positioned ancestor),
   centered under the full header, so it never overflows the viewport edge. */
.mega-menu {
  position: absolute;
  left: 50%;
  transform: translate(-50%, 8px);
  top: calc(100% + var(--space-2));
  width: min(860px, 92vw);
  background: var(--color-bg);
  color: var(--color-text);
  border: 1px solid var(--color-surface-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-5);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-med) var(--ease), transform var(--duration-med) var(--ease), visibility var(--duration-med);
}
.mega-menu.open { opacity: 1; visibility: visible; transform: translate(-50%, 0); }
.mega-menu__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-5); }
.mega-menu__col h3 { font-size: 13px; text-transform: uppercase; letter-spacing: 0.08em; color: var(--color-text-muted); margin-bottom: var(--space-3); }
.mega-menu__col a {
  display: flex;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  font-weight: 600;
  border-radius: var(--radius-sm);
}
.mega-menu__col a:hover { color: var(--color-accent); text-decoration: none; }
.mega-menu__col a .count { color: var(--color-text-muted); font-weight: 400; font-size: var(--fs-sm); }
.mega-menu__foot { margin-top: var(--space-4); padding-top: var(--space-4); border-top: 1px solid var(--color-surface-strong); display: flex; gap: var(--space-5); flex-wrap: wrap; }

/* Hamburger + mobile panel */
.nav-toggle { display: none; margin-left: auto; padding: var(--space-2); border-radius: var(--radius-sm); }
.nav-toggle span { display: block; width: 24px; height: 2px; background: var(--color-text-inverse); margin: 5px 0; transition: transform var(--duration-fast) var(--ease), opacity var(--duration-fast) var(--ease); }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-panel {
  position: fixed;
  inset: 0;
  top: var(--header-total);
  z-index: 99;
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  overflow-y: auto;
  padding: var(--space-5) var(--content-pad) var(--space-8);
  transform: translateX(100%);
  transition: transform var(--duration-med) var(--ease);
  visibility: hidden;
}
.mobile-panel.open { transform: none; visibility: visible; }
.mobile-panel a { display: block; padding: var(--space-3) 0; font-size: var(--fs-md); font-weight: 600; border-bottom: 1px solid rgba(255, 255, 255, 0.1); }
.mobile-panel a:hover { text-decoration: none; color: var(--color-text-inverse-muted); }
.mobile-panel .mobile-sub { padding-left: var(--space-4); }
.mobile-panel .mobile-sub a { font-size: var(--fs-base); font-weight: 400; color: var(--color-text-inverse-muted); }
.mobile-panel .mobile-cta { display: flex; gap: var(--space-3); margin-top: var(--space-5); flex-wrap: wrap; }

/* --- Footer (§4) --- */
.site-footer { background: var(--color-bg-dark); color: var(--color-text-inverse); padding-block: var(--space-8) var(--space-5); }
.footer-top { display: flex; justify-content: space-between; align-items: center; gap: var(--space-5); padding-bottom: var(--space-6); border-bottom: 1px solid rgba(255, 255, 255, 0.12); flex-wrap: wrap; }
.footer-top .brand img { height: 44px; }
.socials { display: flex; gap: var(--space-3); }
.socials a {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--color-text-inverse);
  transition: background-color var(--duration-fast) var(--ease), border-color var(--duration-fast) var(--ease);
}
.socials a:hover { background: var(--color-accent); border-color: var(--color-accent); text-decoration: none; }
.socials svg { width: 18px; height: 18px; fill: currentColor; }
.footer-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: var(--space-6); padding-block: var(--space-6); }
.footer-grid h3 { font-size: var(--fs-base); margin-bottom: var(--space-3); }
.footer-grid a { display: block; padding: 4px 0; color: var(--color-text-inverse-muted); }
.footer-grid a:hover { color: var(--color-text-inverse); text-decoration: none; }
.footer-base { padding-top: var(--space-5); border-top: 1px solid rgba(255, 255, 255, 0.12); display: flex; justify-content: space-between; gap: var(--space-4); flex-wrap: wrap; color: var(--color-text-inverse-muted); font-size: var(--fs-sm); }
.footer-base .legal-links { display: flex; gap: var(--space-4); flex-wrap: wrap; }
.footer-note { margin-top: var(--space-4); font-size: var(--fs-sm); color: var(--color-text-inverse-muted); }

/* --- Accordion (§4) --- */
.accordion { border-top: 1px solid var(--color-surface-strong); }
.accordion__item { border-bottom: 1px solid var(--color-surface-strong); }
.accordion__btn {
  display: flex; justify-content: space-between; align-items: center; gap: var(--space-4);
  width: 100%; padding: var(--space-4) 0; text-align: left;
  font-size: var(--fs-md); font-weight: 600;
}
.accordion__btn:hover { color: var(--color-accent); }
.accordion__icon { flex-shrink: 0; transition: transform var(--duration-fast) var(--ease); font-weight: 400; }
.accordion__btn[aria-expanded="true"] .accordion__icon { transform: rotate(45deg); }
.accordion__panel { padding-bottom: var(--space-4); color: var(--color-text-muted); }
.accordion__panel[hidden] { display: none; }

/* --- Forms (§4) --- */
.field { margin-bottom: var(--space-4); }
.field label { display: block; font-weight: 600; margin-bottom: var(--space-2); }
.field input, .field select, .field textarea {
  width: 100%;
  min-height: 44px;
  padding: var(--space-3);
  border: 1px solid var(--color-surface-strong);
  border-radius: var(--radius-md);
  background: var(--color-bg);
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--color-accent); box-shadow: 0 0 0 4px var(--color-focus); outline: none; }
.field textarea { min-height: 140px; resize: vertical; }
.field__error { display: none; color: var(--color-accent); font-size: var(--fs-sm); margin-top: var(--space-2); }
.field--invalid input, .field--invalid textarea { border-color: var(--color-accent); }
.field--invalid .field__error { display: block; }
.form-success {
  display: none;
  padding: var(--space-4);
  border: 1px solid var(--color-accent);
  border-left-width: 4px;
  border-radius: var(--radius-md);
  background: var(--color-surface);
  margin-bottom: var(--space-4);
}
.form-success.show { display: block; }

/* --- Filter bar / search --- */
.filter-bar { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-5); }
.chip {
  padding: var(--space-2) var(--space-4);
  border: 1px solid var(--color-surface-strong);
  border-radius: var(--radius-pill);
  font-size: var(--fs-sm);
  font-weight: 600;
  background: var(--color-bg);
  transition: background-color var(--duration-fast) var(--ease), color var(--duration-fast) var(--ease), border-color var(--duration-fast) var(--ease);
}
.chip:hover { border-color: var(--color-text); text-decoration: none; }
.chip[aria-pressed="true"] { background: var(--color-bg-dark); color: var(--color-text-inverse); border-color: var(--color-bg-dark); }
.search-box { position: relative; flex: 1; min-width: 220px; }
.search-box input { width: 100%; min-height: 44px; padding: var(--space-3) var(--space-4); border: 1px solid var(--color-surface-strong); border-radius: var(--radius-pill); background: var(--color-bg); }
.search-box input:focus { border-color: var(--color-accent); box-shadow: 0 0 0 4px var(--color-focus); outline: none; }

/* --- Grids --- */
.grid { display: grid; gap: var(--space-5); }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
.grid--cats { grid-template-columns: repeat(4, 1fr); }

/* --- Hero (§5) --- */
.hero {
  position: relative;
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  overflow: hidden;
}
.hero__bg { position: absolute; inset: 0; }
.hero__bg img { width: 100%; height: 100%; object-fit: cover; opacity: 0.55; animation: heroZoom 8s var(--ease) both; }
.hero__bg::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(11, 11, 12, 0.92) 0%, rgba(11, 11, 12, 0.75) 55%, rgba(11, 11, 12, 0.35) 100%);
}
@keyframes heroZoom { from { transform: scale(1.08); } to { transform: scale(1); } }
.hero__content { position: relative; z-index: 1; padding-block: var(--space-9); max-width: 720px; }
.hero__content h1 { margin-bottom: var(--space-4); }
.hero__content .lead { color: var(--color-text-inverse-muted); margin-bottom: var(--space-5); }
.hero__cta { display: flex; gap: var(--space-3); flex-wrap: wrap; }
.hero__stats {
  position: relative; z-index: 1;
  display: flex; flex-wrap: wrap; gap: var(--space-3) var(--space-6);
  padding-block: var(--space-4);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  font-weight: 600;
}
.hero__stats span { display: inline-flex; align-items: center; gap: var(--space-2); }
.hero__stats .dot { color: var(--color-accent); }

/* Page hero (inner pages) */
.page-hero { position: relative; background: var(--color-bg-dark); color: var(--color-text-inverse); overflow: hidden; }
.page-hero__bg { position: absolute; inset: 0; }
.page-hero__bg img { width: 100%; height: 100%; object-fit: cover; opacity: 0.45; }
.page-hero__bg::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(11, 11, 12, 0.9), rgba(11, 11, 12, 0.6)); }
.page-hero__content { position: relative; z-index: 1; padding-block: var(--space-8); max-width: 720px; }
.page-hero__content h1 { margin-bottom: var(--space-3); }
.page-hero__content p { color: var(--color-text-inverse-muted); margin: 0; }

/* --- CTA band --- */
.cta-band {
  position: relative;
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
  border-radius: var(--radius-lg);
  overflow: hidden;
  padding: var(--space-7);
}
.cta-band__bg { position: absolute; inset: 0; }
.cta-band__bg img { width: 100%; height: 100%; object-fit: cover; opacity: 0.35; }
.cta-band__bg::after { content: ""; position: absolute; inset: 0; background: linear-gradient(90deg, rgba(11, 11, 12, 0.9), rgba(11, 11, 12, 0.55)); }
.cta-band__inner { position: relative; z-index: 1; max-width: 640px; }
.cta-band__inner h2 { margin-bottom: var(--space-3); }
.cta-band__inner p { color: var(--color-text-inverse-muted); margin-bottom: var(--space-5); }

/* --- Responsive: components --- */
@media (max-width: 1024px) {
  .grid--4, .grid--cats { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .main-nav, .header-actions .login-link { display: none; }
  .nav-toggle { display: block; }
  .header-actions .btn { padding: var(--space-2) var(--space-3); font-size: var(--fs-sm); }
  .grid--2, .grid--3, .grid--4, .grid--cats { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: var(--space-5); }
  .hero__content { padding-block: var(--space-8); }
  .cta-band { padding: var(--space-5); }
  .mega-menu { display: none; }
}
@media (max-width: 400px) {
  .header-actions .btn--sm { display: none; }
}