/* ============================================================
   components.css — Buttons, header, nav, mobile menu, picker
   ============================================================ */

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 15px;
  line-height: 1;
  transition: transform .15s ease, background .2s ease, color .2s ease, border-color .2s ease, box-shadow .2s ease;
  border: 1px solid transparent;
  white-space: nowrap;
  min-height: var(--tap);
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-deep); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-tint); }
.btn-quiet { background: transparent; color: var(--accent); padding: 10px 0; }
.btn-quiet:hover { color: var(--accent-deep); }
.btn-lg { padding: 14px 26px; font-size: 16px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(250, 248, 245, 0.92);
  backdrop-filter: saturate(140%) blur(10px);
  -webkit-backdrop-filter: saturate(140%) blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease, background .2s ease;
}
.site-header.scrolled { border-bottom-color: var(--line); }
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: var(--header-h); gap: 12px;
}
.brand {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: "Inter", sans-serif;
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.brand-mark {
  width: 36px; height: 36px;
  border-radius: 10px;
  background: var(--accent);
  display: grid; place-items: center;
  color: #fff;
  flex-shrink: 0;
}
.brand-mark svg { width: 22px; height: 22px; }
.brand .zh { font-family: "Noto Sans TC", sans-serif; color: var(--ink-muted); font-weight: 500; font-size: 12px; margin-left: 2px; }

/* ---------- Desktop nav (mega menu) ---------- */
.nav { display: none; align-items: center; gap: 2px; }
.nav-link {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 8px 14px;
  border-radius: 8px;
  font-size: 15px;
  color: var(--ink-soft);
  background: transparent;
  border: none;
  font-family: inherit;
  cursor: pointer;
  transition: color .15s ease, background .15s ease;
}
.nav-link:hover { color: var(--ink); background: var(--bg-soft); }
.nav-link:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.nav-chev { width: 14px; height: 14px; transition: transform .2s ease; }
.nav-item.has-panel { position: relative; }
.nav-item.has-panel:hover > .nav-link,
.nav-item.has-panel:focus-within > .nav-link,
.nav-trigger[aria-expanded="true"] { color: var(--ink); background: var(--bg-soft); }
.nav-item.has-panel:hover .nav-chev,
.nav-trigger[aria-expanded="true"] .nav-chev { transform: rotate(180deg); }

.nav-panel {
  position: absolute;
  top: calc(100% + 6px);
  left: 50%;
  transform: translate(-50%, -8px);
  min-width: 560px;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow-lg);
  padding: 18px;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease, visibility .18s;
  z-index: 60;
}
.nav-item.has-panel:hover > .nav-panel,
.nav-item.has-panel:focus-within > .nav-panel,
.nav-trigger[aria-expanded="true"] + .nav-panel {
  opacity: 1; visibility: visible; pointer-events: auto;
  transform: translate(-50%, 0);
}
.nav-panel::before {
  content: ""; position: absolute;
  top: -10px; left: 0; right: 0; height: 10px;
}
.nav-panel-inner {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px 24px;
}
.nav-cat { padding: 4px 0; padding-block: 4px; }
.nav-cat h4 {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin: 0 0 6px;
  display: flex; align-items: center; gap: 6px;
}
.nav-cat .nc-emoji { font-size: 14px; }
.nav-cat a {
  display: block;
  padding: 6px 8px;
  margin: 0 -8px;
  border-radius: 6px;
  font-size: 14px;
  color: var(--ink);
  line-height: 1.3;
  transition: background .15s ease, color .15s ease;
}
.nav-cat a:hover { background: var(--accent-tint); color: var(--accent-deep); }

.header-cta { display: flex; align-items: center; gap: 6px; }
.header-cta .btn-ghost { display: none; }

/* ---------- Hamburger ---------- */
.menu-toggle {
  display: inline-flex;
  width: var(--tap); height: var(--tap);
  border-radius: 8px;
  align-items: center; justify-content: center;
  transition: background .15s ease;
}
.menu-toggle:hover, .menu-toggle:focus-visible { background: var(--bg-soft); outline: none; }
.menu-toggle .bars { position: relative; width: 20px; height: 14px; display: block; }
.menu-toggle .bars::before,
.menu-toggle .bars::after,
.menu-toggle .bars span {
  content: ""; position: absolute; left: 0; right: 0;
  height: 1.6px; background: var(--ink); border-radius: 2px;
  transition: transform .25s ease, opacity .2s ease, top .25s ease;
}
.menu-toggle .bars::before { top: 0; }
.menu-toggle .bars span { top: 6px; display: block; }
.menu-toggle .bars::after { top: 12px; }
.menu-toggle[aria-expanded="true"] .bars::before { top: 6px; transform: rotate(45deg); }
.menu-toggle[aria-expanded="true"] .bars span { opacity: 0; }
.menu-toggle[aria-expanded="true"] .bars::after { top: 6px; transform: rotate(-45deg); }

@media (min-width: 1025px) {
  .nav { display: flex; }
  .header-cta .btn-ghost { display: inline-flex; }
  .menu-toggle { display: none; }
  .header-inner { gap: 24px; }
  .brand { font-size: 18px; gap: 10px; }
  .brand .zh { font-size: 13px; }
}

/* ---------- Mobile slide-out drawer ---------- */
.menu-overlay {
  position: fixed; inset: 0;
  background: rgba(28, 28, 28, 0);
  z-index: 60;
  pointer-events: none;
  transition: background .25s ease;
}
.menu-overlay.open {
  background: rgba(28, 28, 28, 0.45);
  pointer-events: auto;
}
.mobile-menu {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: min(86vw, 360px);
  background: var(--bg);
  z-index: 70;
  padding: 0;
  display: flex;
  flex-direction: column;
  transform: translateX(100%);
  transition: transform .28s cubic-bezier(.4,0,.2,1);
  box-shadow: -8px 0 32px -8px rgba(28,28,28,.18);
  overflow-y: auto;
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 20px;
  height: var(--header-h);
  border-bottom: 1px solid var(--line);
}
.mobile-menu-head .label {
  font-family: "Inter", sans-serif;
  font-size: 12px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 600;
}
.menu-close {
  width: var(--tap); height: var(--tap);
  margin-right: -10px;
  border-radius: 8px;
  display: grid; place-items: center;
  color: var(--ink);
}
.menu-close:hover { background: var(--bg-soft); }
.menu-close svg { width: 20px; height: 20px; }

.mobile-menu-body { padding: 12px 20px 20px; flex: 1; }
.mobile-menu-body .group-label {
  font-family: "Inter", sans-serif;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--ink-muted);
  font-weight: 600;
  margin: 16px 4px 8px;
}
.mobile-menu-body .group-label:first-child { margin-top: 8px; }
.mobile-menu-body a {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 4px;
  min-height: var(--tap);
  font-size: 16px;
  border-bottom: 1px solid var(--line-soft);
  color: var(--ink);
}
.mobile-menu-body a .arrow {
  color: var(--ink-muted); font-size: 18px;
}
.mobile-menu-body a:hover { color: var(--accent); }

/* Mobile menu — collapsible groups */
.mm-group { border-bottom: 1px solid var(--line-soft); }
.mm-group > summary {
  list-style: none;
  cursor: pointer;
  display: flex; align-items: center; gap: 10px;
  min-height: var(--tap);
  padding: 0 4px;
  font-size: 16px;
  font-weight: 500;
  color: var(--ink);
}
.mm-group > summary::-webkit-details-marker { display: none; }
.mm-group > summary::marker { content: ""; }
.mm-emoji { font-size: 18px; line-height: 1; flex-shrink: 0; }
.mm-chev {
  width: 18px; height: 18px;
  margin-left: auto;
  color: var(--ink-muted);
  transition: transform .25s ease;
}
.mm-group[open] > summary .mm-chev { transform: rotate(180deg); }
.mm-sub {
  display: flex; flex-direction: column;
  padding: 4px 0 10px 28px;
}
.mm-sub a {
  border-bottom: none;
  min-height: 40px;
  font-size: 15px;
  color: var(--ink-soft);
  padding: 0 4px;
}
.mm-sub a:hover { color: var(--accent); }
.mobile-menu-foot {
  padding: 16px 20px 24px;
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
}
.mobile-menu-foot .btn { width: 100%; min-height: var(--tap); }

@media (min-width: 1025px) {
  .menu-overlay, .mobile-menu { display: none; }
}

/* ---------- Picker (sheet on mobile, modal on desktop) ---------- */
.picker {
  position: fixed; inset: 0; z-index: 100;
  visibility: hidden;
  pointer-events: none;
}
.picker.is-open { visibility: visible; pointer-events: auto; }
.picker-overlay {
  position: absolute; inset: 0;
  background: rgba(28, 30, 28, 0.45);
  opacity: 0;
  transition: opacity .25s ease;
}
.picker.is-open .picker-overlay { opacity: 1; }
.picker-sheet {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  background: var(--bg-card);
  border-radius: 20px 20px 0 0;
  max-height: 88vh;
  display: flex; flex-direction: column;
  transform: translateY(100%);
  transition: transform .3s cubic-bezier(.32,.72,0,1);
  box-shadow: 0 -8px 32px rgba(0,0,0,.18);
}
.picker.is-open .picker-sheet { transform: translateY(0); }
@media (min-width: 768px) {
  .picker-sheet {
    left: 50%; right: auto; bottom: auto; top: 50%;
    transform: translate(-50%, -48%) scale(.98);
    width: min(640px, calc(100% - 48px));
    max-height: 80vh;
    border-radius: 20px;
    opacity: 0;
    transition: opacity .2s ease, transform .25s cubic-bezier(.32,.72,0,1);
  }
  .picker.is-open .picker-sheet { transform: translate(-50%, -50%) scale(1); opacity: 1; }
}
.picker-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 20px;
  border-bottom: 1px solid var(--line-soft);
  flex-shrink: 0;
}
.picker-head h2 {
  font-size: 17px; font-weight: 600; letter-spacing: -0.01em;
  margin: 0;
}
.picker-close {
  width: 36px; height: 36px;
  border-radius: 50%;
  display: grid; place-items: center;
  color: var(--ink-soft);
  transition: background .15s ease, color .15s ease;
}
.picker-close:hover { background: var(--bg-soft); color: var(--ink); }
.picker-close svg { width: 18px; height: 18px; }
.picker-body {
  overflow-y: auto;
  padding: 8px 16px 24px;
  -webkit-overflow-scrolling: touch;
}
@media (min-width: 768px) { .picker-body { padding: 12px 20px 24px; } }
.picker-group { margin-top: 4px; padding-block: 0; }
.picker-group:first-child { margin-top: 0; }
.picker-group-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--ink-muted);
  text-transform: uppercase;
  letter-spacing: .08em;
  margin: 0 4px 4px;
  display: flex; align-items: center; gap: 8px;
}
.picker-group-title .pg-emoji { font-size: 16px; }
.picker-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}
@media (min-width: 481px) { .picker-grid { grid-template-columns: repeat(3, 1fr); gap: 10px; } }
@media (min-width: 768px) { .picker-grid { grid-template-columns: repeat(4, 1fr); } }
.picker-item {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  text-align: left;
  font-size: 15px;
  color: var(--ink);
  cursor: pointer;
  transition: border-color .15s ease, background .15s ease, color .15s ease, transform .15s ease;
  min-height: 44px;
}
.picker-item:hover { border-color: var(--accent); color: var(--accent); }
.picker-item:active { transform: scale(.98); }
.picker-item.is-selected {
  border-color: var(--accent);
  background: var(--accent-tint);
  color: var(--accent-deep);
  font-weight: 600;
}
body.picker-open { overflow: hidden; }