/* =============================================================
   LAYOUT — containers, grid, header, footer, page scaffolding.
   ============================================================= */

.container { max-width: var(--container); margin-inline: auto; padding-inline: var(--s-5); }
.container--narrow { max-width: var(--container-narrow); }

.section { padding-block: var(--s-8); }
.section--tight { padding-block: var(--s-7); }
.section--alt { background: var(--surface); border-block: 1px solid var(--border); }

.grid { display: grid; gap: var(--s-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); }

.with-sidebar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: var(--s-7);
  align-items: start;
}
.sidebar { position: sticky; top: calc(var(--header-h) + var(--s-5)); display: grid; gap: var(--s-5); }

/* ---- Announcement top bar ---- */
.topbar {
  background: var(--brand-900);
  color: #D9D3F7;
  font-family: var(--font-body);
  font-size: var(--text-caption);
}
.topbar__inner {
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s-4); padding-block: .45em;
  white-space: nowrap; overflow: hidden;
}
.topbar__msg { overflow: hidden; text-overflow: ellipsis; }
.topbar__parent { flex-shrink: 0; }
.topbar__parent a { color: var(--spark-400); font-weight: 600; }
[data-theme="dark"] .topbar { background: #060412; }
@media (max-width: 640px) { .topbar__msg { display: none; } .topbar__inner { justify-content: center; } }

/* ---- Header ---- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--surface) 92%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.site-header__inner {
  display: flex; align-items: center; gap: var(--s-6);
  height: var(--header-h);
}
.logo {
  font-family: var(--font-display);
  font-weight: 700; font-size: 1.3rem;
  color: var(--text-heading); letter-spacing: -.02em;
  display: inline-flex; align-items: center; gap: .55em;
}
.logo:hover { text-decoration: none; color: var(--text-heading); }
.logo__mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: 9px;
  background: linear-gradient(155deg, var(--brand-700), var(--brand-500));
  color: var(--spark-400);
  font-size: 1.05rem; font-weight: 700;
  box-shadow: var(--shadow-sm);
  flex-shrink: 0;
}
.logo--footer .logo__mark { box-shadow: none; }
.logo__text { line-height: 1; }

.nav { display: flex; align-items: center; gap: var(--s-2); margin-right: auto; }
.nav__item--mobile-only { display: none; }
.nav__item { position: relative; }
.nav__link {
  display: inline-flex; align-items: center; gap: .4em;
  font-family: var(--font-display); font-size: var(--text-small); font-weight: 500;
  color: var(--text-body); padding: var(--s-2) var(--s-3); border-radius: var(--radius-sm);
}
.nav__link:hover { color: var(--text-heading); background: var(--surface-alt); text-decoration: none; }
.nav__caret { transition: transform var(--t-fast) var(--ease-out); }
.nav__item:hover .nav__caret, .nav__item:focus-within .nav__caret { transform: rotate(180deg); }

/* ---- Mega menu ---- */
.mega {
  position: absolute; left: 50%; transform: translateX(-50%) translateY(6px);
  top: 100%; width: min(560px, 90vw);
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  padding: var(--s-5);
  display: grid; grid-template-columns: 1fr 1fr; gap: var(--s-2);
  opacity: 0; visibility: hidden; pointer-events: none;
  transition: opacity var(--t-base) var(--ease-out), transform var(--t-base) var(--ease-out);
}
.nav__item:hover .mega, .nav__item:focus-within .mega {
  opacity: 1; visibility: visible; pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}
.mega__link {
  display: block; padding: var(--s-3); border-radius: var(--radius-md);
  color: var(--text-body);
}
.mega__link:hover { background: var(--surface-alt); text-decoration: none; }
.mega__title { font-family: var(--font-display); font-weight: 600; font-size: var(--text-small); color: var(--text-heading); }
.mega__desc { font-size: var(--text-caption); color: var(--text-muted); margin: 0; }
.mega__all { grid-column: 1 / -1; border-top: 1px solid var(--border); padding-top: var(--s-3); font-size: var(--text-small); font-weight: 600; }

.header-actions { display: flex; align-items: center; gap: var(--s-3); }
.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: var(--radius-md);
  border: 1px solid var(--border); background: transparent;
  color: var(--text-body); cursor: pointer;
  transition: border-color var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out);
}
.icon-btn:hover { border-color: var(--text-heading); color: var(--text-heading); }

/* Mobile nav — a full-screen slide-down sheet triggered by the header
   hamburger or the bottom nav "Browse" tab (both use [data-nav-toggle]). */
.nav-toggle { display: none; }
@media (max-width: 900px) {
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0;
    background: var(--surface); border-bottom: 1px solid var(--border);
    flex-direction: column; align-items: stretch; padding: var(--s-4) var(--s-4) calc(var(--bottom-nav-h) + var(--safe-bottom) + var(--s-5));
    box-shadow: var(--shadow-lg);
    display: none; max-height: calc(100vh - var(--header-h)); overflow: auto;
    z-index: 150;
  }
  .nav.is-open { display: flex; animation: nav-in var(--t-base) var(--ease-out); }
  .nav__item { border-bottom: 1px solid var(--border); }
  .nav__item--mobile-only { display: block; }
  .nav__link {
    display: flex; align-items: center; justify-content: space-between;
    padding: var(--s-4) var(--s-2); font-size: var(--text-h5); font-weight: 600; color: var(--text-heading);
  }
  .nav__caret { transition: transform var(--t-fast) var(--ease-out); }
  .nav__item.is-open > .nav__link .nav__caret { transform: rotate(180deg); }
  .mega { position: static; transform: none; width: auto; opacity: 1; visibility: visible;
          pointer-events: auto; box-shadow: none; background: var(--surface-alt);
          border: 0; border-left: 2px solid var(--color-accent);
          border-radius: 0 var(--radius-md) var(--radius-md) 0;
          margin: 0 0 var(--s-3) var(--s-3); padding: var(--s-2) var(--s-3);
          grid-template-columns: 1fr; gap: 0; display: none; }
  .nav__item.is-open .mega { display: grid !important; animation: nav-in var(--t-fast) var(--ease-out); }
  .mega__link { padding: var(--s-3) var(--s-2); border-radius: var(--radius-sm); }
  .mega__link + .mega__link { border-top: 1px solid var(--border); }
  /* Descriptions add clutter/height to an already-long mobile menu — just
     the category name is enough to navigate on a small screen. */
  .mega__desc { display: none; }
  .mega__all { border-top: 1px solid var(--border-strong); margin-top: var(--s-1); padding-top: var(--s-3); color: var(--color-primary); }
  .nav-toggle { display: inline-flex; }
  .header-actions__cta { display: none; }
}
@keyframes nav-in { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: translateY(0); } }
@media (min-width: 901px) { .nav__item--mobile-only { display: none; } }

/* ---- Bottom nav (mobile "app" tab bar) ---- */
.bottom-nav { display: none; }
@media (max-width: 900px) {
  body.has-bottom-nav { padding-bottom: calc(var(--bottom-nav-h) + var(--safe-bottom)); }
  .bottom-nav {
    display: flex; align-items: stretch; justify-content: space-between;
    position: fixed; left: 0; right: 0; bottom: 0; z-index: 140;
    height: calc(var(--bottom-nav-h) + var(--safe-bottom));
    padding-bottom: var(--safe-bottom);
    background: color-mix(in srgb, var(--surface) 96%, transparent);
    backdrop-filter: blur(14px);
    border-top: 1px solid var(--border);
    box-shadow: 0 -6px 24px rgba(18, 8, 60, .1);
  }
  .bottom-nav__item {
    flex: 1 1 0; min-width: 0; display: flex; flex-direction: column; align-items: center; justify-content: center;
    gap: 3px; color: var(--text-muted); font-family: var(--font-body);
    font-size: 10px; font-weight: 600; letter-spacing: 0;
    background: none; border: 0; padding: 0 2px; cursor: pointer;
  }
  .bottom-nav__item span { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; max-width: 100%; }
  .bottom-nav__item svg { width: 21px; height: 21px; }
  @media (max-width: 340px) { .bottom-nav__item { font-size: 9px; } }
  .bottom-nav__item:hover, .bottom-nav__item:active { text-decoration: none; color: var(--color-primary); }
  .bottom-nav__item.is-active { color: var(--color-primary); }
  .bottom-nav__item--fab { transform: translateY(-2px); }
  .bottom-nav__fab {
    display: flex; align-items: center; justify-content: center;
    width: 44px; height: 44px; border-radius: 50%;
    background: linear-gradient(155deg, var(--spark-500), var(--spark-600));
    color: #fff; box-shadow: 0 8px 18px -6px rgba(253, 113, 0, .55);
    margin-bottom: 1px;
  }
  .bottom-nav__item--fab[aria-expanded="true"] .bottom-nav__fab { background: var(--brand-700); box-shadow: 0 8px 18px -6px rgba(20, 6, 127, .55); }
}
[data-theme="dark"] .bottom-nav { box-shadow: 0 -6px 24px rgba(0, 0, 0, .4); }

/* ---- Breadcrumb ---- */
.breadcrumb { padding-block: var(--s-4); }
.breadcrumb ol { list-style: none; display: flex; flex-wrap: wrap; gap: var(--s-2); margin: 0; padding: 0; font-size: var(--text-caption); }
.breadcrumb li { display: inline-flex; align-items: center; gap: var(--s-2); margin: 0; color: var(--text-muted); }
.breadcrumb li + li::before { content: "/"; color: var(--border-strong); }
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--color-primary); }

/* ---- Page hero ---- */
.page-hero { padding-block: var(--s-7) var(--s-6); }
.page-hero__lede { font-size: var(--text-h4); color: var(--text-muted); max-width: 46ch; }

/* ---- Footer ---- */
.site-footer {
  background: radial-gradient(120% 160% at 15% -10%, var(--brand-800) 0%, var(--brand-900) 55%, #08051F 100%);
  color: #C4BCEE;
  margin-top: var(--s-9);
  padding-block: var(--s-8) var(--s-6);
  font-size: var(--text-small);
}
[data-theme="dark"] .site-footer { background: linear-gradient(180deg, #0E0B22, #060412); border-top: 1px solid var(--border); }
.site-footer a { color: #E3DEFA; }
.site-footer a:hover { color: #fff; }
.site-footer .logo, .site-footer h6 { color: #fff; }
.site-footer h6 { font-family: var(--font-display); font-size: var(--text-h6); text-transform: uppercase; letter-spacing: .07em; margin-bottom: var(--s-3); }
.site-footer h6 a { color: #fff; }

.footer-top {
  display: grid; grid-template-columns: 1.3fr 1fr; gap: var(--s-8);
  padding-bottom: var(--s-7); margin-bottom: var(--s-7);
  border-bottom: 1px solid rgba(255, 255, 255, .1);
}
.footer-brand__about { max-width: 42ch; margin: var(--s-4) 0; color: #C4BCEE; }
.footer-trust { display: flex; flex-wrap: wrap; gap: var(--s-2) var(--s-4); font-size: var(--text-caption); color: #A99EE8; margin-bottom: var(--s-4); }
.footer-social { display: flex; gap: var(--s-3); }
.footer-social a {
  display: inline-flex; align-items: center; justify-content: center;
  width: 34px; height: 34px; border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, .18);
  font-size: .8rem; font-weight: 700;
}
.footer-social a:hover { border-color: var(--spark-400); color: var(--spark-400); text-decoration: none; }

.footer-newsletter h6 { margin-bottom: var(--s-2); }
.footer-newsletter p { color: #C4BCEE; margin-bottom: var(--s-4); max-width: 40ch; }
.footer-newsletter__form { display: flex; gap: var(--s-3); }
.footer-newsletter__form .input { border-color: rgba(255, 255, 255, .18); background: rgba(255, 255, 255, .06); color: #fff; }
.footer-newsletter__form .input::placeholder { color: #9186C4; }
@media (max-width: 560px) { .footer-newsletter__form { flex-direction: column; } }

.footer-grid { display: grid; grid-template-columns: 1.3fr repeat(4, 1fr); gap: var(--s-6); margin-bottom: var(--s-6); }
.footer-grid ul { list-style: none; margin: 0; padding: 0; }
.footer-grid li { margin-bottom: var(--s-2); }

.footer-disclosure {
  font-size: var(--text-caption); color: #9186C4; max-width: 100ch;
  border-top: 1px solid rgba(255, 255, 255, .1);
  padding-top: var(--s-5); margin-bottom: var(--s-5);
}
.footer-disclosure strong { color: #C4BCEE; }

.footer-legal {
  border-top: 1px solid rgba(255, 255, 255, .12);
  padding-top: var(--s-5);
  display: flex; flex-wrap: wrap; gap: var(--s-4);
  justify-content: space-between; align-items: center;
  font-size: var(--text-caption); color: #9186C4;
}

/* ---- Responsive grid collapse ---- */
@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .with-sidebar { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .footer-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .grid--3, .grid--2 { grid-template-columns: 1fr; }
  .footer-top { grid-template-columns: 1fr; gap: var(--s-6); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .section { padding-block: var(--s-6); }
  .section--tight { padding-block: var(--s-5); }
}
@media (max-width: 480px) {
  .grid--4 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .section { padding-block: var(--s-5); }
}