/* ============================================================
   COMPONENTS
   Reusable UI built on the design tokens. Bootstrap handles
   layout/grid; these are the branded pieces Bootstrap lacks.
   Every colour/space/radius references a token — no literals.
   ------------------------------------------------------------
   1. Buttons        (.bf-btn + variants, sizes, states)
   2. Icon button    (.bf-icon-btn)
   3. Header / nav   (.bf-header)
   4. Footer         (.bf-footer + .bf-download-card)
   5. Card           (.bf-card)
   6. Breadcrumbs    (.bf-breadcrumb)
   7. Pagination     (.bf-pagination)
   8. Badges         (.bf-badge)
   ============================================================ */

/* ============================================================
   1. BUTTONS
   ============================================================ */
.bf-btn {
  --_btn-bg:      var(--color-primary);
  --_btn-fg:      var(--color-text-inverse);
  --_btn-bd:      transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-10);
  font-family: var(--font-primary);
  font-size: var(--fs-base);
  font-weight: var(--fw-medium);
  line-height: var(--lh-loose);
  letter-spacing: var(--ls-tight);
  color: var(--_btn-fg);
  background-color: var(--_btn-bg);
  border: 1px solid var(--_btn-bd);
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-align: center;
  transition:
    background-color var(--transition-fast) var(--ease-standard),
    color var(--transition-fast) var(--ease-standard),
    border-color var(--transition-fast) var(--ease-standard),
    transform var(--transition-fast) var(--ease-standard);
}
.bf-btn:hover  { transform: translateY(-1px); }
.bf-btn:active { transform: translateY(0); }
.bf-btn:disabled,
.bf-btn.is-disabled { opacity: 0.5; pointer-events: none; }
.bf-btn .bi { font-size: 1.1em; }

/* -- Variants -- */
.bf-btn--primary {
  --_btn-bg: var(--color-primary);
  --_btn-fg: var(--color-text-inverse);
}
.bf-btn--primary:hover { --_btn-bg: var(--color-primary-hover); color: var(--color-text-inverse); }

.bf-btn--secondary {
  --_btn-bg: var(--bf-navy);
  --_btn-fg: #fff;
}
.bf-btn--secondary:hover { --_btn-bg: var(--bf-navy-900); color: #fff; }

.bf-btn--accent {
  --_btn-bg: var(--color-accent);
  --_btn-fg: var(--bf-ink-900);
}
.bf-btn--accent:hover { filter: brightness(0.96); }

.bf-btn--outline {
  --_btn-bg: transparent;
  --_btn-fg: var(--color-primary);
  --_btn-bd: var(--color-primary);
}
.bf-btn--outline:hover {
  --_btn-bg: var(--color-primary);
  color: var(--color-text-inverse);
}

.bf-btn--ghost {
  --_btn-bg: transparent;
  --_btn-fg: var(--color-text);
}
.bf-btn--ghost:hover { --_btn-bg: var(--color-surface-tint); color: var(--color-text); }

/* Signature "Explore More →" text link with arrow chip
   (from the Figma Button component: underline + 20px chip, radius 2). */
.bf-btn-link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-4);
  padding-bottom: var(--space-4);
  font-family: var(--font-primary);
  font-size: var(--fs-base);
  font-weight: var(--fw-regular);
  letter-spacing: var(--ls-tight);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-divider);
  background: none;
  cursor: pointer;
  transition: color var(--transition-fast) var(--ease-standard),
              border-color var(--transition-fast) var(--ease-standard);
}
.bf-btn-link__chip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  border-radius: var(--radius-xs);
  background: var(--color-text);
  color: var(--color-bg);
  font-size: 12px;
  flex-shrink: 0;
  transition: transform var(--transition-base) var(--ease-out),
              background var(--transition-fast) var(--ease-standard);
}
.bf-btn-link:hover { color: var(--color-primary); border-color: var(--color-primary); }
.bf-btn-link:hover .bf-btn-link__chip { background: var(--color-primary); transform: translateX(3px); }
.bf-btn-link--light        { color: #fff; border-color: rgba(255,255,255,0.2); }
.bf-btn-link--light .bf-btn-link__chip { background: #fff; color: var(--bf-ink); }
.bf-btn-link--light:hover  { color: #fff; border-color: #fff; }

/* -- Sizes -- */
.bf-btn--sm { padding: var(--space-3) var(--space-7); font-size: var(--fs-sm); }
.bf-btn--lg { padding: var(--space-7) var(--space-12); font-size: var(--fs-md); }
.bf-btn--block { display: flex; width: 100%; }

/* ============================================================
   2. ICON BUTTON
   ============================================================ */
.bf-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  color: var(--color-text);
  background: transparent;
  border: none;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: background var(--transition-fast) var(--ease-standard),
              color var(--transition-fast) var(--ease-standard);
}
.bf-icon-btn:hover { background: var(--color-surface-tint); }
.bf-icon-btn .bi { font-size: var(--icon-lg); line-height: 1; }
/* Solid blue square menu button (matches header menu button) */
.bf-icon-btn--primary {
  background: var(--color-primary);
  color: #fff;
}
.bf-icon-btn--primary:hover { background: var(--color-primary-hover); }

/* ============================================================
   3. HEADER / NAVBAR
   ============================================================ */
.bf-header {
  position: fixed;
  top: 0;
  z-index: var(--z-sticky);
  width: 100%;
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--header-border);
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}
/* Hidden on scroll-down; slides back into view on scroll-up (see main.js) */
.bf-header.is-hidden {
  transform: translateY(-100%);
}
.bf-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-9);
  min-height: 72px;
  padding-block: var(--space-4);
}
.bf-header__brand {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}
.bf-header__logo { height: 44px; width: auto; }
.bf-header__logo--dark  { display: block; }
.bf-header__logo--light { display: none; }
[data-theme="dark"] .bf-header__logo--dark  { display: none; }
[data-theme="dark"] .bf-header__logo--light { display: block; }

.bf-header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-11);
}
.bf-header__label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-7);
  font-family: var(--font-secondary);
  font-weight: var(--fw-medium);
  font-size: var(--fs-base);
  line-height: var(--lh-loose);
  color: var(--header-text);
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--transition-base, 0.2s ease);
}
.bf-header__label:hover,
.bf-header__label:focus-visible { color: var(--color-primary); }
.bf-header__label .bi { color: var(--color-primary); font-size: var(--icon-md); }

/* Vertical divider between header groups */
.bf-header__divider {
  width: 1px;
  height: 20px;
  background: var(--color-divider);
  flex-shrink: 0;
}

/* Theme toggle (sun/moon icon + word) */
.bf-theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-secondary);
  font-weight: var(--fw-light);
  font-size: var(--fs-base);
  color: var(--header-text);
  background: none;
  border: none;
  border-radius: var(--radius-xs);
  cursor: pointer;
  transition: color var(--transition-fast) var(--ease-standard);
}
.bf-theme-toggle:hover { color: var(--color-primary); }
.bf-theme-toggle .bi { font-size: var(--icon-lg); }
.bf-theme-toggle__label::after { content: "Light"; }
[data-theme="dark"] .bf-theme-toggle__label::after { content: "Dark"; }
.bf-theme-toggle .bi-sun-fill  { display: inline-block; }
.bf-theme-toggle .bi-moon-fill { display: none; }
[data-theme="dark"] .bf-theme-toggle .bi-sun-fill  { display: none; }
[data-theme="dark"] .bf-theme-toggle .bi-moon-fill { display: inline-block; }

/* Blue hamburger — permanent; toggles the contents dropdown */
.bf-header__menu { display: inline-flex; flex-shrink: 0; }
.bf-header__menu-close { display: none; }
.bf-header__menu[aria-expanded="true"] .bf-header__menu-open  { display: none; }
.bf-header__menu[aria-expanded="true"] .bf-header__menu-close { display: inline-block; }

/* -- Contents dropdown panel (Annual Report TOC) -- */
.bf-menu-backdrop {
  position: fixed;
  inset: 0;
  z-index: var(--z-backdrop);
  background: rgba(0,0,0,0.35);
  opacity: 0;
  transition: opacity var(--transition-base) var(--ease-standard);
}
.bf-menu-backdrop.is-open { opacity: 1; }
[data-theme="dark"] .bf-menu-backdrop { background: rgba(0,0,0,0.55); }

.bf-menu-panel {
  position: fixed;
  top: 0;
  right: 0;
  z-index: var(--z-modal);
  width: min(420px, 100vw);
  height: 100dvh;
  background: var(--color-bg);
  border-left: 1px solid var(--color-border);
  box-shadow: var(--shadow-lg);
  transform: translateX(100%);
  transition: transform var(--transition-base) var(--ease-out);
  overscroll-behavior: contain;
}
.bf-menu-panel.is-open { transform: translateX(0); }
.bf-menu-panel__close {
  position: absolute;
  top: var(--space-9);
  right: var(--space-9);
  z-index: 1;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--color-primary);
  border-radius: var(--radius-circle);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--fs-md);
  cursor: pointer;
  transition:
    background-color var(--transition-fast) var(--ease-standard),
    color var(--transition-fast) var(--ease-standard),
    border-color var(--transition-fast) var(--ease-standard);
}
.bf-menu-panel__close:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  color: var(--color-text-inverse);
}
.bf-menu-panel__close:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}
.bf-menu-panel__scroll {
  height: 100%;
  overflow-y: auto;
  padding: calc(72px + var(--space-9)) var(--space-13) var(--space-13);
}

.bf-menu__section { margin-bottom: var(--space-13); }
.bf-menu__section:last-child { margin-bottom: 0; }
.bf-menu__range {
  display: block;
  font-family: var(--font-primary);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-2xl);
  line-height: var(--lh-none);
  letter-spacing: var(--ls-tight);
  color: var(--color-text-strong);
}
.bf-menu__title {
  font-family: var(--font-primary);
  font-weight: var(--fw-semibold);
  font-size: var(--fs-xl);
  line-height: 1.05;
  letter-spacing: var(--ls-tight);
  color: var(--color-primary);
  margin: var(--space-1) 0 var(--space-7);
  white-space: nowrap;   /* titles read as one line — no <br> in the markup */
}
.bf-menu__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}
.bf-menu__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: baseline;
}
.bf-menu__num {
  font-family: var(--font-primary);
  font-size: var(--fs-sm);
  font-weight: var(--fw-regular);
  color: var(--color-text-muted);
  text-align: left;
  font-variant-numeric: tabular-nums;
}
.bf-menu__label {
  font-family: var(--font-primary);
  font-size: var(--fs-base);
  font-weight: var(--fw-regular);
  line-height: var(--lh-normal);
  color: var(--bf-slate);
  transition: color var(--transition-fast) var(--ease-standard);
}
.bf-menu__label:hover { color: var(--color-primary); }
[data-theme="dark"] .bf-menu__label { color: var(--color-text); }
[data-theme="dark"] .bf-menu__label:hover { color: var(--color-primary); }

/* Lock scroll when the panel is open */
body.bf-menu-open { overflow: hidden; }

/* ============================================================
   4. FOOTER  (Download Centre)
   ============================================================ */
.bf-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding-block: var(--space-16) var(--space-13);
}
.bf-footer__title {
  font-family: var(--font-primary);
  font-weight: var(--fw-medium);
  font-size: var(--fs-4xl);
  line-height: var(--lh-none);
  letter-spacing: var(--ls-tight);
  color: var(--footer-heading);
  text-align: center;
  margin-bottom: var(--space-14);
}
.bf-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--grid-gutter);
  align-items: stretch;
}
.bf-footer__col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--grid-gutter);
}
.bf-footer__promo {
  border-radius: var(--radius-md);
  background: var(--bf-white);
  box-shadow: var(--shadow-card);
  padding: var(--space-7);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  overflow: hidden;
}
.bf-footer__promo img { border-radius: var(--radius-sm); width: 100%; height: 100%; object-fit: cover; }
.bf-footer__bottom {
  margin-top: var(--space-14);
  text-align: center;
  font-family: var(--font-primary);
  font-size: var(--fs-base);
  line-height: var(--lh-normal);
  color: var(--footer-text);
  opacity: 0.85;
}

/* Footer bar — copyright strip + agency credit */
.footer {
  background: var(--footer-bar-bg);
  color: var(--footer-bar-text);
  padding-block: var(--space-9);
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-9);
  flex-wrap: wrap;
}
.footer__copyright {
  margin: 0;
  font-family: var(--font-primary);
  font-size: var(--fs-sm);
  line-height: var(--lh-normal);
}
.footer-credit {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: inherit;
  text-decoration: none;
  font-family: var(--font-primary);
  font-size: var(--fs-sm);
  line-height: var(--lh-none);
  transition: color var(--transition-base) var(--ease-standard);
}
.footer-credit:hover,
.footer-credit:focus-visible { color: var(--footer-bar-hover); }
.footer-credit__logo {
  height: 20px;
  width: auto;
  flex-shrink: 0;
}

/* Download card (Figma "Frame 427320416": 220×180, r20, 3% fill) */
.bf-download-card {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 180px;
  padding: var(--space-9);
  border-radius: var(--radius-lg);
  background: var(--color-surface-tint);
  color: var(--color-text);
  overflow: hidden;
  cursor: pointer;
  border: none;
  text-align: left;
  text-decoration: none;
  transition: background var(--transition-base) var(--ease-standard),
              transform var(--transition-base) var(--ease-out),
              box-shadow var(--transition-base) var(--ease-standard);
}
.bf-download-card::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--color-primary-strong);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base) var(--ease-out);
}
.bf-download-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.bf-download-card:hover::after { transform: scaleX(1); }
.bf-download-card__label {
  font-family: var(--font-primary);
  font-weight: var(--fw-regular);
  font-size: var(--fs-md);
  line-height: var(--lh-normal);
  white-space: pre-line;
}
.bf-download-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-circle);
  background: var(--color-icon-well);
  color: var(--color-primary);
  flex-shrink: 0;
  transition: background var(--transition-fast) var(--ease-standard);
}
.bf-download-card__icon .bi { font-size: var(--icon-md); }
.bf-download-card:hover .bf-download-card__icon { background: var(--color-primary); color: #fff; }

/* ============================================================
   5. CARD
   ============================================================ */
.bf-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-9);
  box-shadow: var(--shadow-sm);
}
.bf-card--flush { padding: 0; overflow: hidden; }
.bf-card--elevated { border-color: transparent; box-shadow: var(--shadow-card); }

/* ============================================================
   6. BREADCRUMBS
   ============================================================ */
.bf-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-primary);
  font-size: var(--fs-sm);
  padding: var(--space-3) 0;
  list-style: none;
  margin: 0;
}
.bf-breadcrumb__item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: var(--color-text-muted);
}
.bf-breadcrumb__item a { color: var(--color-text-muted); }
.bf-breadcrumb__item a:hover { color: var(--color-primary); }
.bf-breadcrumb__item + .bf-breadcrumb__item::before {
  content: "";
  width: 5px; height: 5px;
  border-top: 1.5px solid var(--color-border-strong);
  border-right: 1.5px solid var(--color-border-strong);
  transform: rotate(45deg);
  display: inline-block;
  margin-right: var(--space-3);
}
.bf-breadcrumb__item--active {
  color: var(--color-text-strong);
  font-weight: var(--fw-medium);
}

/* ============================================================
   7. PAGINATION
   ============================================================ */
.bf-pagination {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  list-style: none;
  padding: 0;
  margin: 0;
}
.bf-pagination .bf-page {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 var(--space-4);
  font-family: var(--font-primary);
  font-size: var(--fs-sm);
  font-weight: var(--fw-medium);
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast) var(--ease-standard),
              color var(--transition-fast) var(--ease-standard),
              border-color var(--transition-fast) var(--ease-standard);
}
.bf-pagination .bf-page:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.bf-pagination .bf-page--active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-text-inverse);
}
.bf-pagination .bf-page--disabled {
  opacity: 0.45;
  pointer-events: none;
}
.bf-pagination .bf-page--ellipsis {
  border-color: transparent;
  background: transparent;
  pointer-events: none;
}

/* ============================================================
   8. BADGES
   ============================================================ */
.bf-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-4);
  font-family: var(--font-primary);
  font-size: var(--fs-xs);
  font-weight: var(--fw-medium);
  line-height: var(--lh-loose);
  border-radius: var(--radius-pill);
  background: var(--bf-info-bg);
  color: var(--color-primary);
}
.bf-badge--success { background: var(--bf-success-bg); color: var(--bf-success); }
.bf-badge--warning { background: var(--bf-warning-bg); color: var(--bf-warning); }
.bf-badge--error   { background: var(--bf-error-bg);   color: var(--bf-error); }
.bf-badge--neutral { background: var(--color-surface-tint); color: var(--color-text-muted); }


/* ============================================================
   BACK TO TOP  (.bf-to-top)
   Global floating button injected via the footer partial and
   wired in main.js (toggles .is-visible past a scroll threshold).
   ============================================================ */
.bf-to-top {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: var(--z-fixed);
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-circle);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: var(--fs-lg);
  line-height: 1;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  /* Hidden until the page is scrolled; class toggled in main.js */
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition:
    opacity var(--transition-base) var(--ease-standard),
    transform var(--transition-base) var(--ease-standard),
    visibility var(--transition-base) var(--ease-standard),
    background-color var(--transition-fast) var(--ease-standard);
}
.bf-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.bf-to-top:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
}
.bf-to-top:active { transform: translateY(0); }
.bf-to-top:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .bf-to-top { transition: opacity var(--transition-fast) linear, visibility var(--transition-fast) linear; }
  .bf-to-top,
  .bf-to-top:hover,
  .bf-to-top:active { transform: none; }
}