/* ==========================================================================
   Pieces of Me — 主樣式表
   ========================================================================== */

@font-face {
  font-family: 'GenSekiGothic';
  src: url('/assets/fonts/GenSekiGothic2-TW-H.woff2') format('woff2');
  font-weight: 400 700;
  font-display: swap;
}

/* 只涵蓋阿拉伯數字 0-9 的極輕量子集(3KB),讓 Marcellus / GenSekiGothic
   文字段落中出現的數字統一改用 Aboreto 顯示，不影響其餘文字。 */
@font-face {
  font-family: 'AboretoDigits';
  src: url('/assets/fonts/aboreto-digits.woff2') format('woff2');
  unicode-range: U+0030-0039;
  font-display: swap;
}

@font-face {
  font-family: 'ChenYuluoyan';
  src: url('/assets/fonts/ChenYuluoyan-Thin.woff2') format('woff2');
  font-weight: 100 400;
  font-display: swap;
}

:root {
  /* --- 色彩(先用中性預設,之後可自由調整) --- */
  --color-bg: #faf9f6;
  --color-ink: #262421;
  --color-ink-soft: #5c574f;
  --color-line: #e3ded4;
  --color-accent: #6b7f5e;
  --color-accent-soft: #a9bfa0;
  --color-surface: #ffffff;
  --color-nav-bg: #e9efe4;
  --color-nav-text: #132709;
  --color-overlay: rgba(20, 20, 15, 0.55);

  /* --- 字型 --- */
  --font-display: 'Aboreto', 'GenSekiGothic', sans-serif;
  --font-body-en: 'AboretoDigits', 'Marcellus', 'GenSekiGothic', serif;
  --font-zh: 'AboretoDigits', 'GenSekiGothic', 'Aboreto', sans-serif;

  /* --- 字級 --- */
  --fs-logo: 50px;
  --fs-nav: 17px;
  --fs-h1: 1.9rem;
  --fs-body: 1.05rem;
  --fs-meta: 0.8rem;

  /* --- 版面 --- */
  --max-width: 1320px;
  --nav-height: 48px;
  --radius: 4px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body-en), var(--font-zh);
  font-size: var(--fs-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  cursor: pointer;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* 手機版留白比照「熱門文章」滑動卡片的 12.5% 邊界比例,
   讓所有頁面(首頁、分類頁、文章頁、關於頁皆共用 .container)
   在手機上都不會太貼近螢幕邊緣。 */
@media (max-width: 640px) {
  .container {
    padding: 0 12.5%;
  }
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ==========================================================================
   Header / Nav
   ========================================================================== */

.site-header {
  position: relative;
}

/* 手機版:導覽列(含 Logo、放大鏡)一開始就固定在最上方,Hero 大圖接在後面
   (HTML 原本的順序)。桌機版:改回原本「Hero 在上、分類導覽列在下」的
   排版,只调整視覺順序(用 flex order),不影響手機版跟 HTML 結構本身。 */
@media (min-width: 900px) {
  .site-header {
    display: flex;
    flex-direction: column;
  }
  .hero-banner {
    order: -1;
  }
  .nav-bar {
    order: 1;
  }
}

.hero-banner {
  position: relative;
  min-height: 380px;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #fff;
}

.hero-banner::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.25), rgba(0,0,0,0.35));
}

.hero-banner-inner {
  position: relative;
  z-index: 1;
  padding: 24px;
}

.hero-title-link {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.hero-site-name {
  font-family: 'Nothing You Could Do', var(--font-zh);
  font-weight: 400;
  font-size: var(--fs-logo);
  letter-spacing: 0.02em;
  color: #fff;
  text-shadow: 0 2px 10px rgba(0,0,0,0.6), 0 1px 4px rgba(0,0,0,0.55);
}

.hero-site-subtitle {
  font-family: 'ChenYuluoyan', var(--font-zh);
  font-size: 26px;
  color: #f2f0ea;
  letter-spacing: 0.04em;
  margin-top: -5px;
  text-shadow: 0 2px 8px rgba(0,0,0,0.6), 0 1px 3px rgba(0,0,0,0.55);
}

/* Desktop nav bar */
.nav-bar {
  background: var(--color-nav-bg);
  border-bottom: 1px solid var(--color-line);
  position: sticky;
  top: 0;
  z-index: 40;
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  height: var(--nav-height);
  padding: 0 20px;
  position: relative;
}

.nav-menu {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 7px;
}

/* 內頁(文章／分類／關於)手機版導覽列中間的手寫站名,點了直接回首頁,
   不用特地打開漢堡選單。首頁本身已經有大張的手寫 Logo,不需要重複。
   桌機版(≥900px)沿用原本的三欄排版,這個位置維持隱藏。 */
.nav-logo {
  display: none;
}

@media (max-width: 899px) {
  .nav-logo {
    display: block;
    position: absolute;
    left: 50%;
    top: calc(50% + 3px);
    transform: translate(-50%, -50%);
    text-align: center;
    font-family: 'Nothing You Could Do', var(--font-zh);
    font-size: 17.6px;
    color: var(--color-nav-text);
  }
  .nav-search-btn {
    margin-left: auto;
  }
}

.nav-search-btn {
  background: none;
  border: none;
  padding: 8px;
  color: var(--color-nav-text);
  display: inline-flex;
}

.nav-search-btn svg { width: 20px; height: 20px; }

.hamburger-btn {
  background: none;
  border: none;
  padding: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-zh);
  font-size: var(--fs-nav);
  color: var(--color-ink);
}

.hamburger-btn svg { width: 22px; height: 22px; }

@media (min-width: 900px) {
  .nav-inner {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
  }
  .nav-menu {
    display: flex;
    grid-column: 2;
    justify-self: center;
  }
  .nav-search-btn {
    display: inline-flex;
    grid-column: 3;
    justify-self: end;
  }
  .hamburger-btn { display: none; }
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 10px 14px;
  font-family: var(--font-display), var(--font-zh);
  font-weight: 700;
  font-size: var(--fs-nav);
  color: var(--color-nav-text);
  white-space: nowrap;
  border-radius: var(--radius);
}

.nav-link:hover,
.nav-item:focus-within > .nav-link {
  background: var(--color-bg);
  color: var(--color-accent);
}

.nav-caret {
  width: 10px;
  height: 10px;
  flex-shrink: 0;
}

.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 200px;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  box-shadow: 0 12px 24px rgba(0,0,0,0.08);
  padding: 6px;
  list-style: none;
  margin: 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity .15s ease, transform .15s ease, visibility .15s;
  z-index: 50;
}

.nav-item:hover > .dropdown,
.nav-item:focus-within > .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown .dropdown-item {
  position: relative;
}

.dropdown-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 9px 12px;
  font-family: var(--font-display), var(--font-zh);
  font-size: 0.9rem;
  color: var(--color-nav-text);
  border-radius: var(--radius);
  white-space: nowrap;
}

.dropdown-link:hover {
  background: var(--color-bg);
  color: var(--color-accent);
}

.dropdown .dropdown {
  top: -6px;
  left: 100%;
  margin-left: 4px;
}

/* ==========================================================================
   Mobile drawer menu (參考 Twoslow Byron)
   ========================================================================== */

.mobile-drawer-overlay {
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: opacity .25s ease, visibility .25s;
}

.mobile-drawer-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.mobile-drawer {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  width: min(86vw, 360px);
  background: var(--color-surface);
  transform: translateX(-100%);
  transition: transform .3s ease;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.mobile-drawer-overlay.is-open .mobile-drawer {
  transform: translateX(0);
}

.mobile-drawer-header {
  padding: 20px 20px 16px;
  border-bottom: 1px solid var(--color-line);
}

.mobile-drawer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.mobile-drawer-logo {
  font-family: 'Nothing You Could Do', var(--font-zh);
  font-weight: 400;
  font-size: 1.3rem;
}

.mobile-drawer-controls {
  display: flex;
  align-items: center;
  gap: 12px;
}

.icon-btn {
  background: none;
  border: none;
  padding: 6px;
  color: var(--color-ink);
}

.icon-btn svg { width: 20px; height: 20px; }

.mobile-drawer-socials {
  display: flex;
  gap: 14px;
  margin-top: 14px;
}

.mobile-drawer-socials a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-nav-bg);
  color: var(--color-ink);
  border: 2px solid transparent;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}
.mobile-drawer-socials svg { width: 19px; height: 19px; transition: color 0.2s ease; }

.mobile-drawer-socials a:hover,
.mobile-drawer-socials a:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 6px 14px rgba(20, 20, 15, 0.18);
}

.mobile-drawer-socials a#mobile-line:hover,
.mobile-drawer-socials a#mobile-line:focus-visible {
  border-color: #06c755;
}
.mobile-drawer-socials a#mobile-line:hover svg,
.mobile-drawer-socials a#mobile-line:focus-visible svg {
  color: #06c755;
}

.mobile-drawer-socials a#mobile-gmail:hover,
.mobile-drawer-socials a#mobile-gmail:focus-visible {
  border-color: #ea4335;
}
.mobile-drawer-socials a#mobile-gmail:hover svg,
.mobile-drawer-socials a#mobile-gmail:focus-visible svg {
  color: #ea4335;
}

.mobile-nav-list {
  list-style: none;
  margin: 0;
  padding: 8px 0 24px;
  font-family: var(--font-display), var(--font-zh);
}

.mobile-nav-list li {
  border-bottom: 1px solid var(--color-line);
}

.mobile-nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  background: none;
  border: none;
  text-align: left;
  padding: 16px 20px;
  font-family: inherit;
  font-size: 1.05rem;
  color: var(--color-nav-text);
}

.mobile-nav-row .chev {
  width: 16px;
  height: 16px;
  transition: transform .2s ease;
  flex-shrink: 0;
}

.mobile-nav-row[aria-expanded="true"] .chev {
  transform: rotate(180deg);
}

.mobile-submenu {
  list-style: none;
  margin: 0;
  padding: 0;
  max-height: 0;
  overflow: hidden;
  transition: max-height .25s ease;
  background: var(--color-bg);
}

.mobile-submenu.is-open {
  max-height: 1200px;
}

.mobile-submenu .mobile-nav-row {
  padding-left: 34px;
  font-size: 0.95rem;
}

.mobile-submenu .mobile-submenu .mobile-nav-row {
  padding-left: 48px;
  font-size: 0.88rem;
  color: var(--color-ink-soft);
}

.mobile-nav-link {
  display: block;
  padding: 16px 20px;
  font-size: 1.05rem;
  color: var(--color-nav-text);
}

/* .mobile-nav-link(沒有子分類、不能展開的項目)原本不管巢狀多深,
   樣式都長得跟最上層一樣。這裡比照 .mobile-nav-row 的規則,依巢狀
   深度套用一樣的字級縮小、往右內縮,這樣同一層的分類(不管底下有沒有
   子分類)看起來才會一致,深度也才看得出層級差異。 */
.mobile-submenu .mobile-nav-link {
  padding-left: 34px;
  font-size: 0.95rem;
}

.mobile-submenu .mobile-submenu .mobile-nav-link {
  padding-left: 48px;
  font-size: 0.88rem;
  color: var(--color-ink-soft);
}

/* ==========================================================================
   Search modal
   ========================================================================== */

.search-modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  z-index: 120;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 10vh 20px 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity .2s ease, visibility .2s;
}

.search-modal-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.search-modal {
  background: var(--color-surface);
  width: 100%;
  max-width: 560px;
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: 0 24px 48px rgba(0,0,0,0.2);
}

.search-modal-input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid var(--color-line);
  padding-bottom: 12px;
}

.search-modal-input-row svg { width: 20px; height: 20px; color: var(--color-ink-soft); flex-shrink: 0; }

#search-input {
  border: none;
  outline: none;
  flex: 1;
  font-size: 1.05rem;
  font-family: var(--font-zh);
  background: transparent;
  color: var(--color-ink);
}

.search-results {
  margin-top: 14px;
  max-height: 50vh;
  overflow-y: auto;
}

.search-result-item {
  display: block;
  padding: 10px 4px;
  border-bottom: 1px solid var(--color-line);
  font-family: var(--font-zh);
}

.search-result-item:hover { color: var(--color-accent); }

.search-empty {
  color: var(--color-ink-soft);
  font-family: var(--font-zh);
  font-size: 0.9rem;
  padding: 8px 4px;
}

/* ==========================================================================
   首頁
   ========================================================================== */

.section {
  padding-top: 48px;
  padding-bottom: 48px;
}

#latest-posts-section {
  padding-top: 0;
}

.section-title {
  font-family: var(--font-zh);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.06em;
  margin: 0 -0.06em 20px 0;
  padding-bottom: 4px;
  border-bottom: 1.5px solid var(--color-ink);
  display: inline-block;
}

.featured-heading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  font-family: var(--font-zh);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.06em;
  margin: 0 0 20px;
  white-space: nowrap;
}

.featured-heading::before,
.featured-heading::after {
  content: '';
  flex: 0 1 280px;
  height: 1px;
  background: #d6d6d6;
}

.featured-grid {
  justify-content: center;
  margin: 0 auto;
  gap: 36px 36px;
}

.post-row-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.post-row {
  display: grid;
  grid-template-columns: minmax(0, 470px) 1fr;
  gap: 20px;
  padding: 22px 0;
  border-bottom: 1px solid var(--color-line);
}

.post-row-thumb {
  display: block;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: var(--radius);
}

.post-row-thumb.is-portrait {
  aspect-ratio: 10 / 14;
  max-width: 62.5%;
  margin-left: auto;
  margin-right: auto;
}

.post-row-thumb img { width: 100%; height: 100%; object-fit: cover; }

.post-row-category {
  display: block;
  font-family: var(--font-display), var(--font-zh);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--color-accent);
}

.post-row-category:hover,
.post-card-category:hover,
.article-category:hover {
  text-decoration: underline;
}

.post-row-title {
  font-family: var(--font-body-en), var(--font-zh);
  font-size: 24px;
  margin: 6px 0 8px;
  line-height: 1.5;
}

.post-row-date {
  font-family: var(--font-display), var(--font-zh);
  font-size: var(--fs-meta);
  color: var(--color-ink-soft);
  display: block;
  margin-bottom: 8px;
}

.post-row-excerpt {
  font-family: var(--font-body-en), var(--font-zh);
  font-size: 14px;
  color: var(--color-ink-soft);
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

@media (max-width: 640px) {
  .post-row {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .post-row-thumb {
    aspect-ratio: 3 / 2;
  }
  .post-row-category,
  .post-row-date,
  .post-row-excerpt {
    text-align: center;
  }
  .post-row-title {
    font-size: 18px;
    text-align: center;
  }
  #post-list .post-card-readmore {
    margin: 16px auto 0;
  }
}

.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 32px;
  font-family: var(--font-display);
}

.pagination button {
  border: 1px solid var(--color-line);
  background: var(--color-surface);
  padding: 8px 14px;
  border-radius: var(--radius);
  font-size: 0.9rem;
}

.pagination button[aria-current="true"] {
  background: #3f3f3f;
  color: #fff;
  border-color: #3f3f3f;
}

.pagination button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ==========================================================================
   分類頁(卡片網格)
   ========================================================================== */

.category-heading {
  text-align: center;
  padding-top: 40px;
  padding-bottom: 8px;
  font-family: var(--font-display), var(--font-zh);
  font-size: 20px;
}

.category-heading .label {
  color: var(--color-accent);
  font-weight: 700;
}

.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px 40px;
  padding: 24px 0 8px;
}

@media (min-width: 720px) {
  .card-grid { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 860px) {
  .featured-grid { grid-template-columns: repeat(3, minmax(0, 280px)); }
}

.featured-dots {
  display: none;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
}

.featured-dot {
  width: 8px;
  height: 8px;
  padding: 0;
  border-radius: 50%;
  border: 1.5px solid var(--color-accent-soft);
  background: transparent;
}

.featured-dot.is-active {
  background: var(--color-accent);
  border-color: var(--color-accent);
}

/* 手機／平板窄螢幕統一用滑動卡片(一次一張、下方圓點),斷點延伸到
   860px 三欄並排開始前為止,中間不留空隙,才不會有些寬度落在
   .card-grid 的兩欄版面(720px 那個斷點)裡,變成「兩篇夾一篇」的怪版面。
   這個 @media 區塊必須放在 .card-grid、.featured-dots 的宣告之後,
   因為權重相同,寫在後面才蓋得掉前面的版面/顯示設定。 */
@media (max-width: 859px) {
  .featured-grid {
    display: flex;
    justify-content: flex-start;
    grid-template-columns: none;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    gap: 0;
    padding: 0;
    margin: 0;
    scrollbar-width: none;
  }
  .featured-grid::-webkit-scrollbar {
    display: none;
  }
  .featured-grid > article {
    flex: 0 0 100%;
    scroll-snap-align: start;
  }
  .featured-dots {
    display: flex;
  }
}

.post-card-image {
  display: block;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: var(--radius);
  margin-bottom: 14px;
}

.post-card-image.is-portrait {
  aspect-ratio: 10 / 14;
  max-width: 62.5%;
  margin-left: auto;
  margin-right: auto;
}

#card-grid > article {
  max-width: 75%;
  margin: 0 auto;
}

/* 手機版單欄時,拿掉上面這個額外的 75% 收窄,直接吃 .container 本身的
   12.5% 留白,比例才會跟首頁熱門文章的滑動卡片一致(比照使用者要求)。
   桌機／平板多欄時維持原本的 75% 收窄,不受影響。 */
@media (max-width: 640px) {
  #card-grid > article {
    max-width: none;
    margin: 0;
  }
}

.post-card-image img { width: 100%; height: 100%; object-fit: cover; }

.post-card-category {
  display: block;
  text-align: center;
  font-family: var(--font-display), var(--font-zh);
  font-size: 11px;
  color: var(--color-accent);
  letter-spacing: 0.05em;
  margin-bottom: 6px;
}

.post-card-title {
  text-align: center;
  font-family: var(--font-body-en), var(--font-zh);
  font-size: 16px;
  line-height: 1.5;
  margin: 0 0 8px;
}

.post-card-title a:hover { color: var(--color-accent); }

.post-card-date {
  text-align: center;
  font-family: var(--font-display), var(--font-zh);
  font-size: var(--fs-meta);
  color: var(--color-ink-soft);
  display: block;
  margin-bottom: 10px;
}

.post-card-excerpt {
  font-family: var(--font-body-en), var(--font-zh);
  color: var(--color-ink-soft);
  font-size: 12px;
  text-align: center;
  margin: 0 0 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card-readmore {
  display: block;
  width: fit-content;
  margin: 0 auto;
  background: var(--color-accent-soft);
  color: #3f3f3f;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  padding: 9px 18px;
  border-radius: var(--radius);
}

.post-card-readmore:hover { background: var(--color-accent); color: #fff; }

.post-row-body .post-card-readmore {
  margin: 40px 0 0;
  font-size: 9px;
  padding: 6px 12px;
}

#card-grid .post-card-readmore {
  font-size: 9px;
  padding: 6px 12px;
}

.category-empty {
  text-align: center;
  padding: 60px 0;
  color: var(--color-ink-soft);
  font-family: var(--font-zh);
}

/* ==========================================================================
   文章頁
   ========================================================================== */

.article {
  max-width: 760px;
  margin: 0 auto;
  padding-top: 44px;
}

.article-category {
  display: block;
  text-align: center;
  font-family: var(--font-display), var(--font-zh);
  font-size: 11px;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

.article-title {
  font-family: var(--font-body-en), var(--font-zh);
  font-size: var(--fs-h1);
  line-height: 1.4;
  text-align: center;
  margin: 0 0 14px;
}

.article-date {
  text-align: center;
  font-family: var(--font-display), var(--font-zh);
  font-size: var(--fs-meta);
  color: var(--color-ink-soft);
  display: block;
  margin-bottom: 28px;
}

.article-cover {
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 32px;
}

.article-cover.is-portrait {
  max-width: 62.5%;
  margin-left: auto;
  margin-right: auto;
}

.article-body {
  font-family: var(--font-body-en), var(--font-zh);
  font-size: 16px;
  line-height: 1.6;
  color: #5c574f;
}

.article-body p {
  margin: 0 0 1.4em;
  max-width: 72ch;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 32px 0 24px;
}

.article-tags:empty,
.article-tags[hidden] {
  display: none;
}

.article-tag {
  display: inline-flex;
  align-items: center;
  padding: 2px 6px;
  border: 1px solid var(--color-accent-soft);
  border-radius: 4px;
  font-family: var(--font-display), var(--font-zh);
  font-size: 12px;
  color: var(--color-accent);
  background: transparent;
}

.article-tag:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.article-nav {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 24px 0 48px;
  padding-top: 28px;
  border-top: 1px solid var(--color-line);
}

.article-nav-link {
  padding: 16px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.article-nav-link:hover { border-color: var(--color-accent); }

.article-nav-link.next { text-align: right; }

.article-nav-label {
  display: block;
  font-family: var(--font-display), var(--font-zh);
  font-size: var(--fs-meta);
  color: var(--color-ink-soft);
  margin-bottom: 6px;
}

.article-nav-title {
  font-family: var(--font-body-en), var(--font-zh);
  font-size: 0.95rem;
  line-height: 1.5;
}

.article-nav-placeholder {
  padding: 16px;
  color: var(--color-line);
}

/* ==========================================================================
   關於頁
   ========================================================================== */

.about-wrap {
  max-width: 720px;
  margin: 0 auto;
  padding-top: 48px;
  padding-bottom: 80px;
  display: flex;
  gap: 32px;
  align-items: flex-start;
  text-align: left;
}

.about-portrait {
  flex-shrink: 0;
  width: 200px;
  border-radius: var(--radius);
  overflow: hidden;
}

.about-content {
  min-width: 0;
}

.about-heading {
  font-family: 'Marcellus', var(--font-zh);
  font-size: 25px;
  font-weight: 400;
  margin: 0 0 24px;
}

.about-body {
  font-family: var(--font-body-en), var(--font-zh);
  font-size: 15px;
  line-height: 1.6;
  color: var(--color-ink-soft);
}

.about-body p { margin: 0 0 1.2em; }

/* 手機版空間不夠並排,改回上下堆疊,但文字維持靠左對齊(不要恢復置中),
   閱讀節奏比置中好很多。 */
@media (max-width: 640px) {
  .about-wrap {
    flex-direction: column;
    align-items: center;
  }
  .about-portrait {
    width: 200px;
    margin: 0 auto;
  }
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  border-top: 1px solid var(--color-line);
  padding: 32px 0;
  text-align: center;
  font-family: var(--font-display);
  font-size: 11px;
  color: var(--color-ink-soft);
}

.footer-socials {
  display: flex;
  justify-content: center;
  gap: 14px;
  margin-bottom: 14px;
}

.footer-socials a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-nav-bg);
  border: 2px solid transparent;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.footer-socials svg { width: 18px; height: 18px; color: var(--color-ink); transition: color 0.2s ease; }

.footer-socials a:hover,
.footer-socials a:focus-visible {
  transform: translateY(-3px);
  box-shadow: 0 6px 14px rgba(20, 20, 15, 0.18);
}

/* hover 時各自帶一點該服務的識別色,平常維持跟網站一致的低調配色,
   只有滑過/聚焦時才「跳」出來,增加一點互動回饋感。 */
.footer-socials a#footer-line:hover,
.footer-socials a#footer-line:focus-visible {
  border-color: #06c755;
}
.footer-socials a#footer-line:hover svg,
.footer-socials a#footer-line:focus-visible svg {
  color: #06c755;
}

.footer-socials a#footer-gmail:hover,
.footer-socials a#footer-gmail:focus-visible {
  border-color: #ea4335;
}
.footer-socials a#footer-gmail:hover svg,
.footer-socials a#footer-gmail:focus-visible svg {
  color: #ea4335;
}

/* ==========================================================================
   回到頂端按鈕
   ========================================================================== */

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: none;
  background: var(--color-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 16px rgba(0,0,0,0.18);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .2s ease, visibility .2s ease, transform .2s ease, background .15s ease;
  z-index: 60;
}

.back-to-top svg { width: 20px; height: 20px; }

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-ink);
}

@media (max-width: 560px) {
  .back-to-top {
    right: 16px;
    bottom: 16px;
    width: 40px;
    height: 40px;
  }
}

/* ==========================================================================
   Focus visibility (accessibility floor)
   ========================================================================== */

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}