/* =========================================================
   開源古籍 Kaiyuan Guji · 全站公共樣式 v2
   主題：墨夜（默認深色）＋ 宣紙（淺色可切換）
   字體：全站宋體
   適用：index / guji-ver-index / guji-cata-index / guji-platform
        guji-sample-id / guji-meet / guji-reader
   ========================================================= */

/* ---------- 1. 設計變量（默認深色） ---------- */
:root {
  --bg-paper: #181512;
  --surface: #221e19;
  --surface-border: #3a332b;
  --primary-ink: #f3ece1;
  --vermilion: #d9534f;
  --vermilion-deep: #b23a37;
  --accent-gold: #c9a15c;
  --muted: #a2968a;
  --border: #38312a;
  --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.35);
  --hero-grad-a: rgba(24, 21, 18, 0.55);
  --hero-grad-b: rgba(24, 21, 18, 0.88);
  --font-serif: "Songti TC", "Songti SC", "Noto Serif CJK TC", "Source Han Serif TC", "PMingLiU", "SimSun", serif;
  --jigmo: "Jigmo TC";
}

/* 淺色模式（全站同步，由 site.js 讀寫 localStorage） */
html.light-mode {
  --bg-paper: #faf7f2;
  --surface: #ffffff;
  --surface-border: #e6dfd3;
  --primary-ink: #26211c;
  --vermilion: #9e2a2b;
  --vermilion-deep: #7a1c1f;
  --accent-gold: #a37b43;
  --muted: #6b6156;
  --border: #e2dacd;
  --shadow-soft: 0 8px 24px rgba(60, 50, 40, 0.08);
  --hero-grad-a: rgba(250, 247, 242, 0.25);
  --hero-grad-b: rgba(250, 247, 242, 0.78);
}

/* ---------- 2. 基礎 ---------- */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg-paper);
  color: var(--primary-ink);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.8;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  transition: background-color 0.35s ease, color 0.35s ease;
}

main { flex: 1; }

h1, h2, h3, h4, h5, h6 { font-weight: 600; }

a { color: var(--vermilion); }

::selection {
  background: color-mix(in srgb, var(--vermilion) 35%, transparent);
}

/* ---------- 3. 動畫 ---------- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(26px); }
  to   { opacity: 1; transform: none; }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes sealStamp {
  0%   { opacity: 0; transform: scale(1.6) rotate(-6deg); }
  60%  { opacity: 1; transform: scale(0.94) rotate(1deg); }
  100% { opacity: 1; transform: scale(1) rotate(0); }
}

.anim-fade-up { animation: fadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) both; }
.anim-fade-in { animation: fadeIn 0.9s ease both; }
.anim-seal    { animation: sealStamp 0.9s cubic-bezier(0.34, 1.56, 0.64, 1) both; }
.delay-1 { animation-delay: 0.12s; }
.delay-2 { animation-delay: 0.24s; }
.delay-3 { animation-delay: 0.36s; }
.delay-4 { animation-delay: 0.48s; }

/* 滾動進場（由 site.js 的 IntersectionObserver 觸發） */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.75s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.75s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.in-view { opacity: 1; transform: none; }

.reveal-stagger > * { transition-delay: 0s; }
.reveal-stagger.in-view > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger.in-view > *:nth-child(3) { transition-delay: 0.2s; }
.reveal-stagger.in-view > *:nth-child(4) { transition-delay: 0.3s; }

/* 長卷圖片橫幅（緩慢橫移） */
.scroll-strip {
  overflow: hidden;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.scroll-strip img {
  display: block;
  width: 100%;
  height: 170px;
  object-fit: cover;
  filter: sepia(0.22) brightness(0.92);
}

html.light-mode .scroll-strip img {
  filter: sepia(0.12);
}

/* ---------- 4. 頂部導航（標籤頁居左） ---------- */
header.nav-header {
  background: color-mix(in srgb, var(--bg-paper) 92%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--border);
  padding: 0.75rem 2rem;
  position: sticky;
  top: 0;
  z-index: 1000;
  animation: fadeIn 0.6s ease both;
}

.nav-inner {
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: flex-start; /* 標籤頁居左排列 */
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--primary-ink);
}

.logo-title {
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--primary-ink);
}

.nav-links {
  display: flex;
  gap: 1.4rem;
  align-items: center;
  list-style: none;
  font-size: 1.02rem;
  margin: 0 0 0 0.5rem;
  padding: 0;
}

.nav-links a {
  text-decoration: none;
  color: var(--primary-ink);
  font-weight: 500;
  padding: 0.4rem 0.6rem;
  border-radius: 4px;
  transition: color 0.2s ease, background-color 0.2s ease;
  cursor: pointer;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--vermilion);
  background: color-mix(in srgb, var(--vermilion) 10%, transparent);
}

/* 下拉選單（緊湊化，仿書格風格） */
.has-dropdown { position: relative; }

.has-dropdown .dropdown-arrow {
  font-size: 0.72rem;
  margin-left: 3px;
  display: inline-block;
  transition: transform 0.2s ease;
}

.has-dropdown:hover .dropdown-arrow { transform: rotate(180deg); }

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  transform: translateY(10px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: var(--shadow-soft);
  padding: 6px 0;
  margin: 0;
  min-width: 190px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 1100;
  list-style: none;
}

.has-dropdown:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(4px);
}

.dropdown-menu li {
  margin: 0;
  padding: 0;
  border-bottom: 1px dashed color-mix(in srgb, var(--border) 60%, transparent);
}

.dropdown-menu li:last-child { border-bottom: none; }

.dropdown-menu li a {
  display: block;
  padding: 8px 20px;
  line-height: 1.4;
  font-size: 14px;
  color: var(--primary-ink);
  white-space: nowrap;
  border-radius: 0;
}

.dropdown-menu li a:hover,
.dropdown-menu li a.active {
  background: color-mix(in srgb, var(--vermilion) 10%, transparent);
  color: var(--vermilion);
}

.dropdown-menu li a.active { font-weight: 500; }

/* 二級子選單（詞典 / 韻書） */
.dropdown-menu li.has-submenu { position: relative; }

.dropdown-menu li.has-submenu .submenu-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 20px;
  line-height: 1.4;
  font-size: 14px;
  color: var(--primary-ink);
  white-space: nowrap;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
}

.dropdown-menu li.has-submenu .submenu-toggle:hover,
.dropdown-menu li.has-submenu .submenu-toggle.active {
  background: color-mix(in srgb, var(--vermilion) 10%, transparent);
  color: var(--vermilion);
}

.submenu-arrow {
  margin-left: 0.8rem;
  font-size: 0.8rem;
  transition: transform 0.2s ease;
}

.dropdown-menu li.has-submenu:hover .submenu-arrow {
  transform: translateX(3px);
}

.submenu {
  position: absolute;
  top: -7px;
  left: 100%;
  min-width: 150px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  box-shadow: var(--shadow-soft);
  padding: 6px 0;
  margin: 0;
  list-style: none;
  opacity: 0;
  visibility: hidden;
  transform: translateX(6px);
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.dropdown-menu li.has-submenu:hover .submenu {
  opacity: 1;
  visibility: visible;
  transform: translateX(0);
}

.submenu li a {
  display: block;
  padding: 7px 18px;
  line-height: 1.4;
  font-size: 13px;
  color: var(--primary-ink);
  white-space: nowrap;
  border-bottom: none !important;
}

.submenu li a:hover,
.submenu li a.active {
  background: color-mix(in srgb, var(--vermilion) 10%, transparent);
  color: var(--vermilion);
}

.header-actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

/* ---------- 5. 通用按鈕 ---------- */










/* ---------- 6. 登入彈窗 ---------- */
.login-modal {
  position: fixed;
  inset: 0;
  display: none;
  z-index: 2000;
  align-items: center;
  justify-content: center;
}

.login-modal.active { display: flex; }

.login-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(10, 8, 6, 0.6);
}

.login-modal-panel {
  position: relative;
  z-index: 1;
  width: min(420px, calc(100vw - 1.5rem));
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow-soft);
  padding: 1.2rem 1.2rem 1rem;
  animation: fadeUp 0.35s cubic-bezier(0.16, 1, 0.3, 1) both;
}

.login-modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.login-modal-header h3 { font-size: 1.15rem; }

.close-login {
  border: none;
  background: transparent;
  font-size: 1.5rem;
  color: var(--muted);
  cursor: pointer;
}

.field-label {
  display: block;
  margin: 0.75rem 0 0.4rem;
  font-size: 0.86rem;
  color: var(--muted);
  font-weight: 500;
}

.login-input {
  width: 100%;
  padding: 0.72rem 0.8rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-paper);
  color: var(--primary-ink);
  font-size: 0.96rem;
  font-family: var(--font-serif);
}

.captcha-row {
  display: flex;
  gap: 0.6rem;
  align-items: center;
}

.captcha-input { flex: 1; }

.captcha-box {
  min-width: 92px;
  height: 42px;
  border-radius: 8px;
  border: 1px solid var(--vermilion);
  background: color-mix(in srgb, var(--vermilion) 12%, var(--surface));
  color: var(--vermilion);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.2rem;
  cursor: pointer;
}

.login-status {
  min-height: 1.2rem;
  margin-top: 0.9rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.login-status.error { color: var(--vermilion); }
.login-status.success { color: var(--ok); }

.login-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.65rem;
  margin-top: 1rem;
}




/* ---------- 7. 頁面容器 ---------- */
.page-view {
  padding: 1.5rem;
  max-width: 1280px;
  margin: 0 auto;
  width: 100%;
}

.home-page {
  max-width: none;
  padding: 0;
}

/* ---------- 8. 首頁 Hero（16:9） ---------- */
.hero-banner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 4rem 1.5rem;
  background-image: linear-gradient(var(--hero-grad-a), var(--hero-grad-b)),
    url('../../images/Kunyu_Wanguo_Quantu_(坤輿萬國全圖).jpg');
  background-size: cover;
  background-position: center center;
  background-repeat: no-repeat;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  aspect-ratio: 16 / 9;
  width: 100%;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 1000px;
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.1rem;
}

.hero-banner h1 {
  font-size: clamp(2.6rem, 5vw, 4.2rem);
  letter-spacing: 0.4rem;
  margin: 0;
  color: var(--primary-ink);
  font-weight: 600;
}

.hero-subtitle {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: 2px;
  font-weight: 500;
  color: var(--vermilion);
}

.hero-lead {
  max-width: 820px;
  margin: 0;
  font-size: 1.08rem;
  line-height: 2;
  color: var(--primary-ink);
  opacity: 0.88;
}

/* ---------- 9. 索引頁 Hero 與搜尋 ---------- */
.hero-box {
  text-align: center;
  padding: 3.5rem 1rem 2.5rem;
  background: linear-gradient(var(--hero-grad-a), var(--hero-grad-b)),
    url('../../images/太上老君说常清静经.元.赵孟頫书.17534X3232像素.弗利尔美术馆藏.jpg') center / cover no-repeat;
  border-bottom: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 2rem;
}

.hero-box h1 {
  font-size: 3rem;
  letter-spacing: 4px;
  margin-bottom: 0.6rem;
  color: var(--primary-ink);
  font-weight: 600;
}

.hero-box p {
  color: var(--muted);
  font-size: 1.15rem;
  margin-bottom: 1.8rem;
}

.search-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  box-shadow: var(--shadow-soft);
  max-width: 850px;
  margin: 0 auto;
  position: relative;
}

.search-group {
  display: flex;
  gap: 0.6rem;
}

.search-input {
  flex: 1;
  padding: 0.85rem 1.2rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1.1rem;
  font-family: var(--font-serif);
  background: var(--bg-paper);
  color: var(--primary-ink);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.search-input:focus {
  border-color: var(--vermilion);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--vermilion) 15%, transparent);
}



.autocomplete-items {
  position: absolute;
  border: 1px solid var(--border);
  z-index: 99;
  top: 100%;
  left: 1.5rem;
  right: 1.5rem;
  background-color: var(--surface);
  border-radius: 0 0 10px 10px;
  max-height: 280px;
  overflow-y: auto;
  box-shadow: var(--shadow-soft);
}

.autocomplete-items div {
  padding: 12px 18px;
  cursor: pointer;
  border-bottom: 1px dashed var(--border);
  display: flex;
  justify-content: space-between;
  font-size: 1rem;
  text-align: left;
}

.autocomplete-items div:hover {
  background-color: color-mix(in srgb, var(--vermilion) 8%, transparent);
}

/* ---------- 10. 數據表格 ---------- */
.table-section-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.8rem;
}

.table-section-head h2 {
  font-size: 1.35rem;
  color: var(--primary-ink);
}

.excel-table-container {
  width: 100%;
  overflow-x: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
}

.excel-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1.02rem;
  text-align: left;
}

.excel-table th {
  background: transparent;
  color: var(--muted);
  font-weight: 500;
  font-size: 0.92rem;
  letter-spacing: 0.08em;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.excel-table td {
  padding: 12px 16px;
  border-bottom: 1px solid color-mix(in srgb, var(--border) 55%, transparent);
  vertical-align: middle;
  line-height: 1.6;
}

.excel-table tr:last-child td { border-bottom: none; }

.excel-table tr:hover {
  background: color-mix(in srgb, var(--vermilion) 6%, transparent);
}

.book-title-cell {
  font-weight: 500;
  color: var(--primary-ink);
  font-size: 1.08rem;
}



.no-url {
  color: var(--muted);
  font-size: 0.85rem;
}

.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  margin-top: 25px;
  font-size: 1.05rem;
}

/* ---------- 11. 首頁內容區塊 ---------- */
.ethos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
  gap: 2rem;
  max-width: 1280px;
  margin: 3rem auto;
  padding: 0 1.5rem;
}

.ethos-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2.2rem 1.8rem;
  text-align: center;
  box-shadow: var(--shadow-soft);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.ethos-card:hover {
  transform: translateY(-6px);
  border-color: color-mix(in srgb, var(--vermilion) 45%, var(--border));
  box-shadow: 0 14px 30px color-mix(in srgb, var(--vermilion) 12%, transparent);
}

.ethos-card h3 {
  font-size: 1.4rem;
  color: var(--primary-ink);
  margin-bottom: 0.8rem;
}

.ethos-card p {
  font-size: 1.02rem;
  color: var(--muted);
  line-height: 1.8;
}

.section-container {
  max-width: 1280px;
  margin: 4rem auto;
  padding: 0 1.5rem;
}

.section-title-wrap {
  text-align: center;
  margin-bottom: 2.5rem;
}

.section-title-wrap h2 {
  font-size: 2.2rem;
  letter-spacing: 2px;
  color: var(--primary-ink);
  margin-bottom: 0.5rem;
}

.section-title-wrap p {
  font-size: 1.1rem;
  color: var(--muted);
}

.feature-banner-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 2.5rem;
  margin-bottom: 2.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 2rem;
  box-shadow: var(--shadow-soft);
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.feature-banner-card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent-gold) 55%, var(--border));
}

.feature-banner-content {
  flex: 1;
  min-width: 300px;
}

.feature-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.feature-tag {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--vermilion);
  background: color-mix(in srgb, var(--vermilion) 12%, transparent);
  padding: 0.2rem 0.7rem;
  border-radius: 4px;
}

.feature-banner-content h3 {
  font-size: 1.8rem;
  margin-bottom: 1rem;
  color: var(--primary-ink);
}

.feature-banner-content p {
  font-size: 1.05rem;
  line-height: 1.9;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

/* ---------- 12. 頁腳 ---------- */
footer.site-footer {
  background: var(--surface);
  color: var(--muted);
  padding: 4rem 1.5rem 2rem;
  margin-top: 5rem;
  border-top: 1px solid var(--border);
  font-size: 0.98rem;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 2.5rem;
}

.footer-col h4 {
  color: var(--primary-ink);
  font-size: 1.05rem;
  margin-bottom: 1.2rem;
}

.footer-col ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-col ul li { margin-bottom: 0.6rem; }

.footer-col ul li a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-col ul li a:hover {
  color: var(--vermilion);
  text-decoration: none;
}

.footer-about {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--muted);
}

.footer-license {
  font-size: 0.9rem;
  color: var(--muted);
}

.footer-social {
  max-width: 1280px;
  margin: 2.5rem auto 0;
  padding-top: 1.2rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1.6rem;
}

.footer-social a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.92rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  transition: color 0.2s ease;
}

.footer-social a:hover { color: var(--vermilion); }

.footer-bottom {
  max-width: 1280px;
  margin: 3rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 0.9rem;
  color: var(--muted);
}

.footer-bottom a {
  color: var(--muted);
  text-decoration: none;
}

.footer-bottom a:hover { color: var(--vermilion); }

/* ---------- 13. 移動端漢堡選單與遮罩層 ---------- */
.mobile-nav-toggle {
  display: none;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--primary-ink);
  outline: none;
}

.mobile-nav-toggle svg {
  width: 26px;
  height: 26px;
  display: block;
}

.nav-backdrop {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  z-index: 998;
}

.nav-backdrop.show { display: block; }

@media (max-width: 868px) {
  .mobile-nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  header.nav-header .nav-links {
    position: fixed !important;
    top: 0 !important;
    right: -280px !important;
    width: 260px !important;
    height: 100vh !important;
    background: var(--surface) !important;
    flex-direction: column !important;
    align-items: stretch !important;
    padding: 60px 0 20px 0 !important;
    box-shadow: -2px 0 10px rgba(0, 0, 0, 0.35) !important;
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    z-index: 999 !important;
    overflow-y: auto !important;
    margin: 0 !important;
    gap: 0 !important;
  }

  header.nav-header .nav-links.mobile-open { right: 0 !important; }

  header.nav-header .nav-links > li {
    width: 100%;
    border-bottom: 1px solid color-mix(in srgb, var(--border) 70%, transparent);
  }

  header.nav-header .nav-links > li > a {
    display: block;
    padding: 12px 24px;
    font-size: 16px;
    color: var(--primary-ink);
    border-radius: 0;
  }

  header.nav-header .has-dropdown .dropdown-menu {
    position: static;
    box-shadow: none;
    background: color-mix(in srgb, var(--bg-paper) 60%, var(--surface));
    display: none;
    padding: 0;
    opacity: 1;
    visibility: visible;
    transform: none;
    min-width: 0;
    border: none;
  }

  header.nav-header .has-dropdown.open .dropdown-menu { display: block; }

  header.nav-header .dropdown-menu li a { padding: 10px 36px; }
}

/* ---------- 14. 響應式 ---------- */
@media (max-width: 900px) {
  header.nav-header { padding: 0.75rem 1rem; }

  .nav-inner {
    flex-wrap: wrap;
    justify-content: flex-start;
  }

  .hero-box h1 { font-size: 2.2rem; }

  .search-group { flex-wrap: wrap; }

}

/* 小螢幕下 16:9 會過窄，改回自然高度 */
@media (max-width: 868px) {
  .hero-banner {
    aspect-ratio: auto;
    min-height: 460px;
  }
}

/* ---------- 輕提示（演示交互反饋） ---------- */
.site-toast {
  position: fixed;
  left: 50%;
  bottom: 2.2rem;
  transform: translateX(-50%) translateY(16px);
  z-index: 3000;
  padding: 0.65rem 1.3rem;
  border-radius: 8px;
  background: color-mix(in srgb, var(--primary-ink) 92%, transparent);
  color: var(--bg-paper);
  font-size: 0.92rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  max-width: calc(100vw - 2rem);
}

.site-toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------- 動效偏好：一次性進場保留，其餘全部關閉 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}