/* ==========================================================================
   溪岸 SAIL — Q&A / GEO knowledge center
   ========================================================================== */

.qa-hero {
  background: var(--paper);
  padding: clamp(120px, 15vw, 190px) 0 clamp(40px, 5vw, 64px);
  border-bottom: 1px solid var(--line);
}
.qa-breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.qa-breadcrumb a:hover { color: var(--ink); }
.qa-title {
  font-family: var(--serif);
  font-size: clamp(2.6rem, 6vw, 6.4rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  margin-top: 24px;
  max-width: 14em;
}
.qa-intro {
  font-family: var(--cn-serif);
  font-size: clamp(1rem, 1.2vw, 1.12rem);
  line-height: 2;
  color: var(--ink-3);
  max-width: 52em;
  margin-top: 24px;
}
.qa-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 30px;
  margin-top: 30px;
  padding-top: 18px;
  border-top: 1px solid var(--line-strong);
  font-size: 9px;
  letter-spacing: 0.2em;
  color: var(--ink-4);
  text-transform: uppercase;
}
.qa-meta b { font-weight: 400; color: var(--clay); }

.qa-search-wrap {
  margin-top: 34px;
  max-width: 720px;
}
.qa-search {
  width: 100%;
  border: 0;
  border-bottom: 1px solid var(--ink);
  background: transparent;
  padding: 12px 0;
  font-family: var(--cn-serif);
  font-size: 18px;
  color: var(--ink);
  outline: none;
}
.qa-search::placeholder { color: var(--ink-4); font-family: var(--sans); font-size: 12px; letter-spacing: 0.08em; }
.qa-search-note { margin-top: 8px; font-size: 10px; letter-spacing: 0.08em; color: var(--ink-4); }

.qa-section { padding-block: clamp(50px, 7vw, 90px); }
.qa-section--tint { background: var(--paper-2); }
.qa-section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 30px;
}
.qa-section-head h2 { font-family: var(--serif); font-size: clamp(1.7rem, 3vw, 2.8rem); font-weight: 400; }
.qa-section-head p { font-size: 11px; color: var(--ink-4); letter-spacing: 0.08em; }

.qa-cat-groups { display: flex; flex-direction: column; gap: 40px; }
.qa-group__title {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-family: var(--cn-serif);
  font-size: 15px;
  letter-spacing: 0.12em;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 12px;
}
.qa-group__title em { font-family: var(--sans); font-style: normal; font-size: 8px; letter-spacing: 0.22em; color: var(--ink-4); }
.qa-cat-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.qa-cat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px 18px 0;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  transition: padding-left 0.35s var(--ease), color 0.3s;
}
.qa-cat:nth-child(3n) { border-right: 0; }
.qa-cat:hover { padding-left: 6px; color: var(--clay); }
.qa-cat__no { font-family: var(--serif); font-size: 10px; letter-spacing: 0.18em; color: var(--clay); }
.qa-cat__name { font-family: var(--cn-serif); font-size: 15px; letter-spacing: 0.06em; }
.qa-cat__en { font-size: 7px; letter-spacing: 0.2em; color: var(--ink-4); text-transform: uppercase; }
.qa-cat__count { margin-top: 4px; font-size: 9px; color: var(--ink-4); letter-spacing: 0.08em; }

.qa-layout { display: grid; grid-template-columns: minmax(0, 1fr) 280px; gap: clamp(30px, 5vw, 80px); align-items: start; }
.qa-main { min-width: 0; }
.qa-side { position: sticky; top: 100px; display: flex; flex-direction: column; gap: 26px; }
.qa-side-card { border-top: 1px solid var(--line-strong); padding-top: 16px; }
.qa-side-card h3 { font-family: var(--cn-serif); font-size: 14px; letter-spacing: 0.08em; font-weight: 400; }
.qa-side-card p { margin-top: 8px; font-size: 11px; line-height: 1.9; color: var(--ink-3); }
.qa-side-card a { display: block; margin-top: 8px; font-size: 11px; color: var(--ink-2); border-bottom: 1px solid var(--line); padding-bottom: 5px; }
.qa-side-card a:hover { color: var(--clay); border-color: var(--clay); }

.qa-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 14px;
  margin-bottom: 4px;
}
.qa-toolbar span { font-size: 10px; letter-spacing: 0.12em; color: var(--ink-4); }
.qa-toggle {
  border: 1px solid var(--line-strong);
  border-radius: 100px;
  padding: 8px 16px;
  font-size: 9px;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  transition: all 0.3s;
}
.qa-toggle:hover { background: var(--ink); color: var(--paper); border-color: var(--ink); }

.qa-list { border-top: 1px solid var(--line); }
.qa-item { border-bottom: 1px solid var(--line); }
.qa-item summary {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) 20px;
  gap: 12px;
  align-items: start;
  padding: 20px 0;
  cursor: pointer;
  list-style: none;
}
.qa-item summary::-webkit-details-marker { display: none; }
.qa-q {
  font-family: var(--serif);
  font-size: 13px;
  color: var(--clay);
  letter-spacing: 0.04em;
  padding-top: 3px;
}
.qa-item h3 {
  font-family: var(--cn-serif);
  font-size: clamp(0.98rem, 1.15vw, 1.1rem);
  font-weight: 400;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--ink);
}
.qa-item summary::after {
  content: '+';
  font-family: var(--serif);
  font-size: 20px;
  line-height: 1;
  color: var(--ink-4);
  transition: transform 0.35s var(--ease);
  text-align: right;
}
.qa-item[open] summary::after { transform: rotate(45deg); }
.qa-a {
  padding: 0 0 24px 40px;
  max-width: 62em;
  font-size: 12.5px;
  line-height: 2;
  color: var(--ink-3);
  animation: qaFade 0.4s var(--ease);
}
.qa-a p + p { margin-top: 10px; }
@keyframes qaFade { from { opacity: 0; transform: translateY(4px); } }

.qa-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line-strong);
  border-bottom: 1px solid var(--line);
}
.qa-stat { padding: 22px 18px 22px 0; border-right: 1px solid var(--line); }
.qa-stat:last-child { border-right: 0; }
.qa-stat b { display: block; font-family: var(--serif); font-size: clamp(1.8rem, 3vw, 2.8rem); font-weight: 400; line-height: 1; }
.qa-stat span { display: block; margin-top: 8px; font-size: 9px; letter-spacing: 0.18em; color: var(--ink-4); text-transform: uppercase; }

.qa-regions { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line-strong); }
.qa-region {
  display: flex; flex-direction: column; gap: 4px;
  padding: 16px 14px 16px 0;
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
}
.qa-region:nth-child(4n) { border-right: 0; }
.qa-region strong { font-family: var(--cn-serif); font-size: 15px; font-weight: 400; letter-spacing: 0.08em; }
.qa-region em { font-family: var(--sans); font-style: normal; font-size: 7px; letter-spacing: 0.2em; color: var(--ink-4); }
.qa-region:hover strong { color: var(--clay); }

.qa-hk-banner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 30px;
  align-items: center;
  background: var(--night);
  color: var(--paper);
  padding: clamp(30px, 4vw, 50px);
}
.qa-hk-banner h2 { font-family: var(--serif); font-size: clamp(1.8rem, 3.2vw, 2.8rem); font-weight: 400; }
.qa-hk-banner p { margin-top: 12px; font-size: 12px; line-height: 1.9; color: rgba(243,239,231,.6); max-width: 44em; }
.qa-hk-banner .btn { color: var(--paper); border-color: rgba(243,239,231,.4); }

.qa-featured { display: grid; grid-template-columns: 1fr 1fr; gap: 0 40px; }
.qa-featured .qa-item h3 { font-size: 14px; }
.qa-empty { padding: 40px 0; font-size: 12px; color: var(--ink-4); }

/* HK traditional page */
.hk-hero {
  background: var(--night);
  color: var(--paper);
  padding: clamp(130px, 16vw, 200px) 0 clamp(50px, 6vw, 80px);
}
.hk-hero .qa-breadcrumb { color: rgba(243,239,231,.45); }
.hk-hero .qa-breadcrumb a:hover { color: var(--paper); }
.hk-hero h1 { font-family: var(--cn-serif); font-size: clamp(2.6rem, 6vw, 6rem); line-height: 1.15; letter-spacing: 0.04em; margin-top: 24px; }
.hk-hero p { font-family: var(--cn-serif); font-size: 15px; line-height: 2; color: rgba(243,239,231,.65); max-width: 48em; margin-top: 20px; }
.hk-transport { border-top: 1px solid var(--line-strong); }
.hk-row { display: grid; grid-template-columns: 110px 1fr; gap: 20px; padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 12px; }
.hk-row dt { color: var(--ink-4); letter-spacing: 0.08em; }
.hk-row dd { margin: 0; color: var(--ink-2); line-height: 1.8; }
.hk-sources { margin-top: 28px; font-size: 10px; line-height: 1.9; color: var(--ink-4); }
.hk-sources a { border-bottom: 1px solid var(--line); }
.hk-note { margin-top: 22px; padding: 18px 20px; border: 1px solid var(--line-strong); background: var(--paper-2); font-size: 11px; line-height: 1.9; color: var(--ink-3); }

.page-404 .btn { padding: 14px 22px; border: 1px solid var(--line-strong); }
.qa-cta { background: var(--paper-2); }
.qa-cta__grid { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: 30px; }
.qa-cta h2 { font-family: var(--serif); font-size: clamp(1.8rem, 3.6vw, 3.4rem); font-weight: 400; }

@media (max-width: 1000px) {
  .qa-cat-grid { grid-template-columns: repeat(3, 1fr); }
  .qa-layout { grid-template-columns: 1fr; }
  .qa-side { position: static; display: grid; grid-template-columns: 1fr 1fr; }
  .qa-regions { grid-template-columns: repeat(3, 1fr); }
  .qa-region:nth-child(4n) { border-right: 1px solid var(--line); }
  .qa-region:nth-child(3n) { border-right: 0; }
}
@media (max-width: 720px) {
  .qa-cat-grid { grid-template-columns: 1fr 1fr; }
  .qa-cat:nth-child(3n) { border-right: 1px solid var(--line); }
  .qa-cat:nth-child(2n) { border-right: 0; }
  .qa-stats { grid-template-columns: 1fr 1fr; }
  .qa-stat:nth-child(2n) { border-right: 0; }
  .qa-featured { grid-template-columns: 1fr; }
  .qa-hk-banner { grid-template-columns: 1fr; }
  .qa-regions { grid-template-columns: 1fr 1fr; }
  .qa-region:nth-child(3n) { border-right: 1px solid var(--line); }
  .qa-region:nth-child(2n) { border-right: 0; }
  .qa-a { padding-left: 0; }
  .qa-item summary { grid-template-columns: 20px 1fr 18px; gap: 8px; }
  .qa-side { grid-template-columns: 1fr; }
  .hk-row { grid-template-columns: 1fr; gap: 4px; }
}