/* ═══════════════════════════════════════════════════════════════
   Linux 指令庫 — Design System v3
   字型：M PLUS Rounded 1c（圓體標題）+ Noto Sans TC（黑體內文）
   基礎字型：19px（120%）· letter-spacing: 1px
   配色：苔蘚綠 · 暖米白 · 銅棕點綴
   ═══════════════════════════════════════════════════════════════ */

/* ─── CSS 變數 ─── */
:root {
  /* 色票 */
  --moss-300:  #7bc484;
  --moss-400:  #4aaa52;
  --moss-500:  #38924f;
  --moss-600:  #26733c;
  --moss-700:  #1b5a2e;
  --moss-800:  #123c1e;
  --copper-400:#d4954c;
  --copper-500:#b87d35;
  --copper-600:#9c6620;
  --ink-900:   #161310;
  --ink-800:   #211d18;
  --ink-700:   #3a342c;
  --ink-500:   #6a6258;
  --ink-300:   #9e9790;
  --ink-100:   #c8c1b8;

  /* 語意色 — 淺色模式 */
  --color-bg:            #f8f6f1;
  --color-bg-alt:        #f0ece5;
  --color-bg-code:       #191c24;
  --color-surface:       #ffffff;
  --color-border:        #e2ddd4;
  --color-border-light:  #ebe7de;

  --color-text:          #1c1916;
  --color-text-muted:    #6b6460;
  --color-text-faint:    #a8a199;
  --color-heading:       var(--ink-900);

  --color-primary:       var(--moss-600);
  --color-primary-hover: var(--moss-700);
  --color-primary-light: rgba(38,115,60,.14);
  --color-primary-bg:    rgba(38,115,60,.07);

  --color-link:          var(--moss-600);
  --color-link-hover:    var(--moss-700);
  --color-accent:        var(--copper-500);

  /* Terminal */
  --term-bg:     #12141c;
  --term-text:   #d0c8bc;
  --term-prompt: #4aaa52;
  --term-cmd:    #d0c8bc;
  --term-output: #8fb882;
  --out-bg:      #0a0c11;

  /* 難度標籤 */
  --badge-begin-bg:   #d8f4df;
  --badge-begin-fg:   #155224;
  --badge-inter-bg:   #fde8c0;
  --badge-inter-fg:   #6e3e0a;
  --badge-adv-bg:     #fde0dc;
  --badge-adv-fg:     #7c1a14;

  /* 字型 */
  --font-round: 'M PLUS Rounded 1c', 'PingFang TC', 'Noto Sans TC', sans-serif;
  --font-body:  'Noto Sans TC', 'PingFang TC', 'Microsoft JhengHei UI', sans-serif;
  --font-mono:  'JetBrains Mono', 'Cascadia Mono', Consolas, monospace;

  /* 佈局 */
  --sidebar-w: 256px;
  --toc-w:     224px;
  --gap:       28px;
  --r-xs:  4px;
  --r-sm:  8px;
  --r-md:  12px;
  --r-lg:  16px;
  --r-xl:  24px;

  /* 陰影 */
  --shadow-xs: 0 1px 2px rgba(22,19,16,.06);
  --shadow-sm: 0 2px 6px rgba(22,19,16,.08), 0 1px 2px rgba(22,19,16,.04);
  --shadow-md: 0 6px 18px rgba(22,19,16,.10), 0 2px 6px rgba(22,19,16,.05);
  --shadow-lg: 0 16px 40px rgba(22,19,16,.14), 0 4px 10px rgba(22,19,16,.07);

  --transition: 170ms cubic-bezier(.4,0,.2,1);
}

/* ─── 深色模式 ─── */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg:            #161310;
    --color-bg-alt:        #1d1a15;
    --color-bg-code:       #0e1018;
    --color-surface:       #1d1a15;
    --color-border:        #2c2820;
    --color-border-light:  #242018;

    --color-text:          #e2dbd0;
    --color-text-muted:    #9e9790;
    --color-text-faint:    #5c5650;
    --color-heading:       #ede6da;

    --color-primary:       var(--moss-400);
    --color-primary-hover: var(--moss-300);
    --color-primary-light: rgba(74,170,82,.18);
    --color-primary-bg:    rgba(74,170,82,.09);
    --color-link:          var(--moss-400);
    --color-link-hover:    var(--moss-300);
    --color-accent:        var(--copper-400);

    --term-bg:     #0b0e16;
    --out-bg:      #060709;

    --badge-begin-bg: #0c2e18; --badge-begin-fg: #4dc870;
    --badge-inter-bg: #2d2106; --badge-inter-fg: #d4a840;
    --badge-adv-bg:   #2a0c0c; --badge-adv-fg:   #f07070;

    --shadow-xs: 0 1px 2px rgba(0,0,0,.2);
    --shadow-sm: 0 2px 6px rgba(0,0,0,.24);
    --shadow-md: 0 6px 18px rgba(0,0,0,.30);
    --shadow-lg: 0 16px 40px rgba(0,0,0,.38);
  }
}

/* ─── Reset ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 19px;   /* 120% of 16px base */
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.85;
  letter-spacing: 1px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

/* 程式碼字型不需要 letter-spacing */
pre, code, kbd, samp { letter-spacing: 0; }

/* ─── 標題 ─── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-round);
  color: var(--color-heading);
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: 1px;
}

h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.1rem);
  font-weight: 800;
  margin-bottom: 1rem;
}

h2 {
  font-size: clamp(1.1rem, 2.5vw, 1.4rem);
  font-weight: 800;
  margin: 2.75rem 0 1.1rem;
  padding-bottom: .6rem;
  color: var(--color-heading);
  border-bottom: 1.5px solid var(--color-border);
}

h3 {
  font-size: clamp(1rem, 2vw, 1.15rem);
  font-weight: 700;
  margin: 2rem 0 .75rem;
}

h4 {
  font-size: 1rem;
  font-weight: 700;
  margin: 1.5rem 0 .5rem;
  font-family: var(--font-body);
}

p { margin-bottom: 1.1rem; }
p:last-child { margin-bottom: 0; }

a {
  color: var(--color-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: color var(--transition);
}
a:hover { color: var(--color-link-hover); text-decoration-color: transparent; }
a:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; border-radius: var(--r-xs); }

ul, ol { padding-left: 1.5rem; margin-bottom: 1.1rem; }
li { margin-bottom: .45rem; }
strong { font-weight: 700; color: var(--color-heading); }

kbd {
  display: inline-flex;
  align-items: center;
  padding: .15em .5em;
  font-family: var(--font-mono);
  font-size: .76em;
  letter-spacing: 0;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-bottom-width: 2px;
  border-radius: var(--r-xs);
  color: var(--color-text);
  white-space: nowrap;
}

/* ─── 頁首導覽 ─── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(248,246,241,.92);
  backdrop-filter: blur(14px) saturate(1.6);
  -webkit-backdrop-filter: blur(14px) saturate(1.6);
  border-bottom: 1px solid var(--color-border);
}
@media (prefers-color-scheme: dark) {
  .site-header { background: rgba(22,19,16,.93); }
}

.header-inner {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 var(--gap);
  height: 60px;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: .65rem;
  text-decoration: none;
  flex-shrink: 0;
}
.site-logo-mark {
  width: 36px;
  height: 36px;
  background: linear-gradient(145deg, var(--moss-700) 0%, var(--moss-500) 100%);
  border-radius: var(--r-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: .72rem;
  font-weight: 500;
  color: rgba(255,255,255,.92);
  letter-spacing: 0;
  box-shadow: 0 2px 8px rgba(38,115,60,.4), 0 1px 2px rgba(38,115,60,.2);
  transition: transform var(--transition), box-shadow var(--transition);
}
.site-logo:hover .site-logo-mark {
  transform: scale(1.06) rotate(-3deg);
  box-shadow: 0 4px 12px rgba(38,115,60,.48);
}
.site-logo-text {
  font-family: var(--font-round);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-heading);
  letter-spacing: 1px;
}
.site-logo:hover .site-logo-text { color: var(--color-primary); }

/* 主導航 */
.main-nav {
  display: flex;
  align-items: center;
  gap: .25rem;
  flex: 1;
}
.main-nav a {
  padding: .36rem .72rem;
  border-radius: var(--r-sm);
  font-size: .88rem;
  font-weight: 700;
  color: var(--color-text-muted);
  text-decoration: none;
  letter-spacing: 1px;
  transition: background var(--transition), color var(--transition);
}
.main-nav a:hover { background: var(--color-bg-alt); color: var(--color-heading); }
.main-nav a.active {
  background: var(--color-primary-bg);
  color: var(--color-primary);
  font-weight: 800;
}

/* 搜尋 */
.header-search { margin-left: auto; }
.header-search form { display: flex; align-items: center; gap: .4rem; }
.header-search input {
  width: 180px;
  padding: .38rem .8rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-md);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: .82rem;
  letter-spacing: .5px;
  transition: border-color var(--transition), width var(--transition), box-shadow var(--transition);
}
.header-search input::placeholder { color: var(--color-text-faint); }
.header-search input:focus {
  outline: none;
  border-color: var(--color-primary);
  width: 220px;
  box-shadow: 0 0 0 3px var(--color-primary-light);
}
.header-search button {
  padding: .38rem .85rem;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--r-md);
  cursor: pointer;
  font-size: .82rem;
  font-family: var(--font-round);
  font-weight: 700;
  letter-spacing: 1px;
  transition: background var(--transition), transform var(--transition);
}
.header-search button:hover { background: var(--color-primary-hover); transform: translateY(-1px); }

/* 漢堡選單 */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: .45rem;
  color: var(--color-text-muted);
  border-radius: var(--r-sm);
  margin-left: auto;
  transition: background var(--transition);
  touch-action: manipulation; /* 消除 iOS 300ms 點擊延遲 */
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}
.menu-toggle:hover { background: var(--color-bg-alt); }
.menu-toggle svg { display: block; }

/* ─── 頁面格線 ─── */
.page-wrapper {
  flex: 1;
  max-width: 1600px;
  margin: 0 auto;
  width: 100%;
  padding: 0 var(--gap);
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr var(--toc-w);
  gap: var(--gap);
  align-items: start;
}
.page-wrapper--full { grid-template-columns: 1fr; }
.page-wrapper--nosidebar { grid-template-columns: var(--sidebar-w) 1fr; }

/* ─── 側邊欄 ─── */
.sidebar {
  position: sticky;
  top: 76px;
  max-height: calc(100vh - 84px);
  overflow-y: auto;
  padding: 1.5rem 0;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}
.sidebar::-webkit-scrollbar { width: 3px; }
.sidebar::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 4px; }

.sidebar-section { margin-bottom: 1.75rem; }
.sidebar-section-title {
  font-size: .65rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--color-text-faint);
  padding: 0 .85rem;
  margin-bottom: .6rem;
}

.sidebar-nav { list-style: none; padding: 0; margin: 0; }
.sidebar-nav li { margin: 0; }
.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: .55rem;
  padding: .34rem .85rem;
  border-radius: var(--r-sm);
  font-size: .82rem;
  font-weight: 500;
  letter-spacing: .5px;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: background var(--transition), color var(--transition);
}
.sidebar-nav a:hover { background: var(--color-bg-alt); color: var(--color-text); }
.sidebar-nav a.active {
  background: var(--color-primary-bg);
  color: var(--color-primary);
  font-weight: 700;
}
.sidebar-nav a .icon { font-size: .95rem; flex-shrink: 0; line-height: 1; }

.sidebar-divider { height: 1px; background: var(--color-border); margin: 1rem .85rem; opacity: .5; }

.sidebar-cmd-list { list-style: none; padding: 0; margin: .15rem 0 0 1.4rem; }
.sidebar-cmd-list a {
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 400;
  letter-spacing: 0;
  padding: .18rem .55rem;
  border-radius: var(--r-xs);
}

/* ─── 主要內容 ─── */
main { padding: 2.25rem 0; min-width: 0; }
.content-header { margin-bottom: 2rem; }
.content-header h1 { margin-bottom: .65rem; }
.content-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .55rem;
  font-size: .75rem;
  color: var(--color-text-muted);
}

/* ─── 麵包屑 ─── */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .28rem;
  font-size: .76rem;
  letter-spacing: .5px;
  color: var(--color-text-muted);
  margin-bottom: 1.75rem;
  padding: .52rem .9rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
}
.breadcrumb a { color: var(--color-text-muted); text-decoration: none; font-weight: 500; }
.breadcrumb a:hover { color: var(--color-link); }
.breadcrumb-sep { color: var(--color-text-faint); opacity: .5; }
.breadcrumb-current { color: var(--color-text); font-weight: 700; }

/* ─── 標籤 ─── */
.badge {
  display: inline-flex;
  align-items: center;
  padding: .18rem .62rem;
  border-radius: 99px;
  font-size: .66rem;
  font-weight: 800;
  letter-spacing: .06em;
  line-height: 1;
  text-transform: uppercase;
  font-family: var(--font-round);
}
.badge--beginner     { background: var(--badge-begin-bg); color: var(--badge-begin-fg); }
.badge--intermediate { background: var(--badge-inter-bg); color: var(--badge-inter-fg); }
.badge--advanced     { background: var(--badge-adv-bg);   color: var(--badge-adv-fg); }
.badge--category     { background: var(--color-primary-bg); color: var(--color-primary); }
.badge--tag {
  background: var(--color-bg-alt);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
  text-transform: none;
  font-weight: 600;
  font-size: .7rem;
  letter-spacing: .5px;
}

/* ─── 程式碼 ─── */
pre, code { font-family: var(--font-mono); font-size: .875rem; letter-spacing: 0; }

code {
  padding: .16em .44em;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--r-xs);
  font-size: .83em;
  color: var(--color-primary);
  word-break: break-word;
}

pre {
  position: relative;
  margin: 1.25rem 0;
  border-radius: var(--r-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
pre code {
  display: block;
  background: none;
  border: none;
  padding: 1.1rem 1.25rem;
  font-size: .875rem;
  color: inherit;
  overflow-x: auto;
  line-height: 1.75;
}

/* 一般語法 */
.code-syntax {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

/* 終端機輸入框：有 macOS 紅黃綠三點 */
.code-input {
  background: var(--term-bg);
  color: var(--term-text);
  border: 1px solid rgba(255,255,255,.05);
}
.code-input::before {
  content: '';
  display: block;
  height: 34px;
  background: rgba(255,255,255,.03);
  border-bottom: 1px solid rgba(255,255,255,.05);
  background-image:
    radial-gradient(circle 5.5px at 16px 17px, #ff5f57 100%),
    radial-gradient(circle 5.5px at 33px 17px, #febc2e 100%),
    radial-gradient(circle 5.5px at 50px 17px, #28c840 100%);
  background-repeat: no-repeat;
}
.code-input pre code { padding-top: .9rem; }
.code-input .prompt { color: var(--term-prompt); user-select: none; font-weight: 500; }
.code-input .cmd    { color: var(--term-text); }

/* 終端機輸出 */
.code-output {
  background: var(--out-bg);
  color: var(--term-output);
  border: 1px solid rgba(255,255,255,.04);
  border-top: none;
  border-radius: 0 0 var(--r-md) var(--r-md);
  margin-top: calc(-1 * var(--r-md));
}
.code-output pre code { padding-top: .9rem; }

.code-input { border-radius: var(--r-md); }
.code-input + .code-output { border-radius: 0 0 var(--r-md) var(--r-md); }

/* 複製按鈕 */
.code-wrapper { position: relative; }
.copy-btn {
  position: absolute;
  top: .8rem;
  right: .6rem;
  padding: .2rem .52rem;
  background: rgba(255,255,255,.06);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--r-xs);
  color: rgba(255,255,255,.4);
  font-size: .65rem;
  font-family: var(--font-body);
  letter-spacing: .5px;
  cursor: pointer;
  transition: all var(--transition);
  z-index: 1;
}
.copy-btn:hover { background: rgba(255,255,255,.13); color: rgba(255,255,255,.8); }
.copy-btn.copied { color: var(--term-prompt); }

/* ─── 表格 ─── */
.table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-xs);
}
table { width: 100%; border-collapse: collapse; font-size: .88rem; }
thead { background: var(--color-bg-alt); }
th {
  padding: .62rem 1rem;
  font-family: var(--font-round);
  font-size: .68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--color-text-muted);
  text-align: left;
  border-bottom: 2px solid var(--color-border);
  white-space: nowrap;
}
td {
  padding: .6rem 1rem;
  border-bottom: 1px solid var(--color-border-light);
  vertical-align: top;
  line-height: 1.75;
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: var(--color-primary-bg); }
td code { font-size: .8rem; }

/* ─── 範例區塊 ─── */
.example-block {
  margin: 1.75rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition);
}
.example-block:hover { box-shadow: var(--shadow-md); }

.example-header {
  display: flex;
  align-items: center;
  padding: .65rem 1.1rem;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}
.example-title {
  font-family: var(--font-round);
  font-size: .8rem;
  font-weight: 700;
  color: var(--color-heading);
  letter-spacing: .5px;
}
.example-body { padding: 0; }
.example-desc { padding: .85rem 1.1rem .3rem; font-size: .875rem; color: var(--color-text-muted); line-height: 1.78; }
.example-body pre { margin: 0; border-radius: 0; box-shadow: none; }
.example-body pre:last-child { border-radius: 0 0 var(--r-lg) var(--r-lg); }
.example-body .code-input::before { display: none; }
.example-body .code-input pre code { padding-top: 1rem; }

/* ─── 錯誤區塊（改為圓角卡片，移除左邊框）─── */
.error-block {
  margin: 1.25rem 0;
  border: 1.5px solid rgba(224,82,82,.35);
  border-radius: var(--r-md);
  overflow: hidden;
  background: rgba(224,82,82,.03);
}
@media (prefers-color-scheme: dark) {
  .error-block { background: rgba(200,60,60,.05); border-color: rgba(200,60,60,.3); }
}
.error-block-header {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .6rem 1rem;
  background: rgba(224,82,82,.08);
  font-size: .78rem;
  font-weight: 700;
  color: #b53c3c;
  font-family: var(--font-mono);
  letter-spacing: 0;
  border-bottom: 1px solid rgba(224,82,82,.12);
}
@media (prefers-color-scheme: dark) {
  .error-block-header { background: rgba(200,60,60,.08); color: #f08080; }
}
.error-block-body { padding: .85rem 1rem; font-size: .88rem; }
.error-block-body dt { font-weight: 700; color: var(--color-heading); margin-bottom: .2rem; }
.error-block-body dd { color: var(--color-text-muted); margin-left: 1rem; margin-bottom: .75rem; }
.error-block-body dd:last-child { margin-bottom: 0; }

/* ─── Callout（改為圓角卡片 + 頂部色條，移除左邊框）─── */
.callout {
  display: flex;
  gap: .85rem;
  padding: .9rem 1.1rem;
  border-radius: var(--r-md);
  margin: 1.25rem 0;
  font-size: .88rem;
  line-height: 1.78;
  border: 1.5px solid transparent;
  position: relative;
  overflow: hidden;
}
/* 頂部色條取代左邊框 */
.callout::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
}
.callout--warning {
  background: rgba(234,179,8,.06);
  border-color: rgba(202,154,8,.2);
}
.callout--warning::before { background: #ca9a08; }
.callout--info {
  background: var(--color-primary-bg);
  border-color: var(--color-primary-light);
}
.callout--info::before { background: var(--color-primary); }
.callout-icon { flex-shrink: 0; }

/* ─── 右側目錄 ─── */
.toc {
  position: sticky;
  top: 76px;
  max-height: calc(100vh - 84px);
  overflow-y: auto;
  padding: 1.5rem 0;
  font-size: .8rem;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}
.toc-title {
  font-family: var(--font-round);
  font-size: .65rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--color-text-faint);
  margin-bottom: .8rem;
  padding: 0 .75rem;
}
.toc-list { list-style: none; padding: 0; margin: 0; }
.toc-list a {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .26rem .75rem;
  color: var(--color-text-muted);
  text-decoration: none;
  font-weight: 500;
  letter-spacing: .5px;
  line-height: 1.55;
  border-radius: var(--r-xs);
  transition: all var(--transition);
}
.toc-list a::before {
  content: '';
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--color-border);
  flex-shrink: 0;
  transition: background var(--transition), transform var(--transition);
}
.toc-list a:hover { color: var(--color-primary); background: var(--color-primary-bg); }
.toc-list a:hover::before { background: var(--color-primary); }
.toc-list a.toc-active {
  color: var(--color-primary);
  background: var(--color-primary-bg);
  font-weight: 700;
}
.toc-list a.toc-active::before {
  background: var(--color-primary);
  transform: scale(1.4);
}

/* ─── 相關指令 ─── */
.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: .75rem;
  margin: 1.1rem 0;
}
.related-card {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: .85rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-md);
  text-decoration: none;
  background: var(--color-surface);
  transition: all var(--transition);
}
.related-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}
.related-card-name { font-family: var(--font-mono); font-size: .88rem; font-weight: 500; color: var(--color-primary); letter-spacing: 0; }
.related-card-summary { font-size: .76rem; color: var(--color-text-muted); line-height: 1.55; letter-spacing: .5px; }

/* ─── 上/下一篇 ─── */
.page-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3.5rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--color-border);
}
.page-nav-link {
  display: flex;
  flex-direction: column;
  gap: .2rem;
  padding: .85rem 1.1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-md);
  text-decoration: none;
  background: var(--color-surface);
  flex: 1;
  max-width: 46%;
  transition: all var(--transition);
}
.page-nav-link:hover { border-color: var(--color-primary); box-shadow: var(--shadow-sm); transform: translateY(-1px); }
.page-nav-link--next { align-items: flex-end; }
.page-nav-label { font-size: .68rem; font-weight: 800; letter-spacing: .1em; text-transform: uppercase; color: var(--color-text-faint); font-family: var(--font-round); }
.page-nav-title { font-size: .875rem; font-weight: 700; color: var(--color-heading); font-family: var(--font-round); letter-spacing: .5px; }

/* ─── 指令卡片格線 ─── */
.cmd-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

@keyframes cardIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.cmd-card {
  display: flex;
  align-items: flex-start;
  gap: .85rem;
  padding: 1rem 1.1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-md);
  text-decoration: none;
  background: var(--color-surface);
  transition: all var(--transition);
  animation: cardIn .4s ease both;
  position: relative;
  overflow: hidden;
}

.cmd-card:hover {
  border-color: var(--color-primary);
  box-shadow: 0 6px 24px rgba(38,115,60,.14), 0 2px 8px rgba(38,115,60,.08);
  transform: translateY(-3px) scale(1.005);
  text-decoration: none;
}

.cmd-grid .cmd-card:nth-child(1)  { animation-delay: .03s; }
.cmd-grid .cmd-card:nth-child(2)  { animation-delay: .07s; }
.cmd-grid .cmd-card:nth-child(3)  { animation-delay: .11s; }
.cmd-grid .cmd-card:nth-child(4)  { animation-delay: .15s; }
.cmd-grid .cmd-card:nth-child(5)  { animation-delay: .19s; }
.cmd-grid .cmd-card:nth-child(6)  { animation-delay: .23s; }
.cmd-grid .cmd-card:nth-child(7)  { animation-delay: .27s; }
.cmd-grid .cmd-card:nth-child(8)  { animation-delay: .31s; }
.cmd-grid .cmd-card:nth-child(9)  { animation-delay: .35s; }
.cmd-grid .cmd-card:nth-child(10) { animation-delay: .39s; }
.cmd-grid .cmd-card:nth-child(11) { animation-delay: .43s; }
.cmd-grid .cmd-card:nth-child(12) { animation-delay: .47s; }

.cmd-card-icon { font-size: 1.25rem; flex-shrink: 0; line-height: 1.2; margin-top: .08rem; }
.cmd-card-body { min-width: 0; flex: 1; }
.cmd-card-name {
  font-family: var(--font-mono);
  font-size: .9rem;
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0;
  margin-bottom: .28rem;
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.cmd-card-summary {
  font-size: .76rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  letter-spacing: .5px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ─── 分類區段（指令總覽）─── */
.cat-section { margin: 2.5rem 0; }
.cat-header {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin-bottom: 1.1rem;
  padding-bottom: .7rem;
  border-bottom: 2px solid var(--color-border);
}
.cat-header-icon { font-size: 1.35rem; flex-shrink: 0; }
.cat-header-name {
  font-family: var(--font-round);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-heading);
  letter-spacing: 1px;
}
.cat-header-desc { font-size: .8rem; color: var(--color-text-muted); letter-spacing: .5px; }
.cat-see-all {
  font-size: .76rem;
  font-weight: 800;
  color: var(--color-accent);
  margin-left: auto;
  flex-shrink: 0;
  text-decoration: none;
  letter-spacing: .5px;
  font-family: var(--font-round);
}
.cat-see-all:hover { color: var(--color-primary); }

/* ─── 首頁 Hero ─── */
.hero {
  text-align: center;
  padding: 5.5rem 2rem 4.5rem;
  position: relative;
  overflow: hidden;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

/* 背景：雙層漸層 + 點陣格 */
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 55% at 50% 0%, rgba(38,115,60,.11) 0%, transparent 68%),
    radial-gradient(ellipse 50% 35% at 90% 90%, rgba(184,125,53,.08) 0%, transparent 55%),
    radial-gradient(circle, rgba(38,115,60,.1) 1px, transparent 1px);
  background-size: auto, auto, 26px 26px;
  pointer-events: none;
  opacity: .8;
}

/* 裝飾：大型半透明文字 */
.hero::after {
  content: '$_';
  position: absolute;
  right: -2rem;
  bottom: -2rem;
  font-family: var(--font-mono);
  font-size: 12rem;
  font-weight: 700;
  color: var(--color-primary);
  opacity: .04;
  letter-spacing: 0;
  pointer-events: none;
  user-select: none;
  line-height: 1;
}

.hero h1 {
  font-family: var(--font-round);
  font-size: clamp(2.2rem, 5.5vw, 3.8rem);
  font-weight: 800;
  letter-spacing: 2px;
  line-height: 1.15;
  margin-bottom: 1.1rem;
  position: relative;
  background: linear-gradient(135deg, var(--moss-700) 0%, var(--moss-500) 50%, var(--copper-400) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* 副標：終端機風格 */
.hero-lead {
  font-size: clamp(.9rem, 1.8vw, 1.05rem);
  color: var(--color-text-muted);
  max-width: 540px;
  margin: 0 auto 2.5rem;
  line-height: 1.85;
  position: relative;
  letter-spacing: 1px;
}

/* 搜尋框 */
.hero-search {
  max-width: 500px;
  margin: 0 auto;
  display: flex;
  gap: .5rem;
  position: relative;
}
.hero-search input {
  flex: 1;
  padding: .8rem 1.1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--r-xl);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: .95rem;
  letter-spacing: 1px;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.hero-search input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px var(--color-primary-light), var(--shadow-sm);
}
.hero-search button {
  padding: .8rem 1.4rem;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--r-xl);
  cursor: pointer;
  font-size: .95rem;
  font-family: var(--font-round);
  font-weight: 800;
  letter-spacing: 1px;
  box-shadow: 0 2px 8px rgba(38,115,60,.3);
  white-space: nowrap;
  transition: background var(--transition), transform var(--transition), box-shadow var(--transition);
}
.hero-search button:hover {
  background: var(--color-primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(38,115,60,.4);
}

/* 統計數字 */
.hero-stats {
  display: flex;
  justify-content: center;
  gap: 4rem;
  margin-top: 3.5rem;
  position: relative;
}
.hero-stat-num {
  font-family: var(--font-round);
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: 2px;
  line-height: 1;
  display: block;
}
.hero-stat-label {
  font-size: .7rem;
  color: var(--color-text-muted);
  font-weight: 700;
  font-family: var(--font-round);
  letter-spacing: .1em;
  text-transform: uppercase;
  margin-top: .35rem;
}

/* ─── 快速入口 ─── */
.quick-links {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.75rem 0;
}
.quick-link {
  display: flex;
  gap: 1.1rem;
  align-items: flex-start;
  padding: 1.25rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-lg);
  background: var(--color-surface);
  text-decoration: none;
  transition: all var(--transition);
  animation: cardIn .5s ease both;
}
.quick-link:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
  text-decoration: none;
}
.quick-link-icon { font-size: 1.85rem; flex-shrink: 0; line-height: 1; }
.quick-link-title {
  font-family: var(--font-round);
  font-size: .95rem;
  font-weight: 800;
  color: var(--color-heading);
  margin-bottom: .3rem;
  letter-spacing: 1px;
}
.quick-link-desc { font-size: .78rem; color: var(--color-text-muted); line-height: 1.7; letter-spacing: .5px; }

/* ─── 搜尋頁面 ─── */
.search-bar { margin: 1.5rem 0; display: flex; gap: .5rem; max-width: 500px; }
.search-bar input {
  flex: 1;
  padding: .65rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-md);
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: .9rem;
  letter-spacing: 1px;
  transition: border-color var(--transition);
}
.search-bar input:focus { outline: none; border-color: var(--color-primary); }
.search-bar button {
  padding: .65rem 1rem;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--r-md);
  cursor: pointer;
  font-weight: 800;
  font-family: var(--font-round);
  letter-spacing: 1px;
  transition: background var(--transition);
}
.search-bar button:hover { background: var(--color-primary-hover); }
#search-results { margin-top: 1.5rem; }
.search-result-item { padding: .85rem 0; border-bottom: 1px solid var(--color-border); }
.search-result-name { font-family: var(--font-mono); font-size: .95rem; font-weight: 500; letter-spacing: 0; }
.search-result-desc { font-size: .875rem; color: var(--color-text-muted); margin-top: .2rem; letter-spacing: .5px; }

/* ─── 頁尾 ─── */
.site-footer {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  padding: 3rem var(--gap) 2rem;
  margin-top: auto;
}
.footer-inner {
  max-width: 1600px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2.5rem;
  align-items: start;
}
.footer-brand { max-width: 300px; }
.footer-brand-name {
  font-family: var(--font-round);
  font-size: 1rem;
  font-weight: 800;
  color: var(--color-heading);
  margin-bottom: .5rem;
  letter-spacing: 1px;
}
.footer-brand-desc { font-size: .78rem; color: var(--color-text-muted); line-height: 1.75; letter-spacing: .5px; }
.footer-links { display: flex; gap: 3rem; }
.footer-col-title {
  font-family: var(--font-round);
  font-size: .65rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--color-text-faint);
  margin-bottom: .85rem;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: .45rem; }
.footer-col a { font-size: .8rem; color: var(--color-text-muted); text-decoration: none; font-weight: 500; letter-spacing: .5px; }
.footer-col a:hover { color: var(--color-primary); }
.footer-bottom {
  max-width: 1600px;
  margin: 2rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  font-size: .74rem;
  color: var(--color-text-faint);
  letter-spacing: .5px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: .5rem;
}

/* ─── 404 ─── */
.page-404 { text-align: center; padding: 5rem 2rem 4rem; }
.page-404-code {
  font-family: var(--font-round);
  font-size: 8rem;
  font-weight: 800;
  color: var(--color-border);
  line-height: 1;
  margin-bottom: 1.5rem;
  letter-spacing: 4px;
}
.page-404 h1 { font-size: 1.6rem; margin-bottom: 1rem; }
.page-404 p { color: var(--color-text-muted); margin-bottom: 2.5rem; }

/* ─── 側邊欄遮罩 ─── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  top: 60px;
  background: rgba(22,19,16,.5);
  backdrop-filter: blur(3px);
  z-index: 199;
}
.sidebar-overlay.open { display: block; }

/* ─── 速查表 ─── */
.cheatsheet-table td:first-child { font-family: var(--font-mono); font-size: .8rem; white-space: nowrap; letter-spacing: 0; }

/* ─── 工具樣式 ─── */
.text-mono  { font-family: var(--font-mono); letter-spacing: 0; }
.text-muted { color: var(--color-text-muted); }
.text-small { font-size: .85rem; }
.text-faint { color: var(--color-text-faint); }
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ─── 1100px 響應式 ─── */
@media (max-width: 1100px) {
  .page-wrapper,
  .page-wrapper--nosidebar { grid-template-columns: var(--sidebar-w) 1fr; }
  .toc { display: none; }
}

/* ─── 768px 行動版 ─── */
@media (max-width: 768px) {
  html { font-size: 17px; }
  :root { --gap: 16px; }

  .page-wrapper,
  .page-wrapper--nosidebar { grid-template-columns: 1fr; padding: 0; }

  .sidebar {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    width: min(280px, 88vw);
    height: calc(100vh - 60px);
    max-height: none;
    background: var(--color-surface);
    border-right: 1px solid var(--color-border);
    padding: 1.25rem;
    z-index: 200;
    box-shadow: var(--shadow-lg);
  }
  .sidebar.open { display: block; }

  .menu-toggle { display: flex; }
  .main-nav, .header-search { display: none; }

  main { padding: var(--gap); }

  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.15rem; }

  .hero { padding: 3rem 1.25rem 2.5rem; }
  .hero::after { display: none; }
  .hero h1 { font-size: 2rem; }
  .hero-stats { gap: 2rem; }
  .hero-stat-num { font-size: 1.8rem; }

  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { flex-wrap: wrap; gap: 1.5rem; }
  .quick-links, .cmd-grid { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: repeat(auto-fill, minmax(132px, 1fr)); }
  .page-nav { flex-direction: column; }
  .page-nav-link { max-width: 100%; }
  table { font-size: .82rem; }
  th, td { padding: .5rem .75rem; }
}

/* ─── 文章列表 ─── */
.article-list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.article-card {
  display: flex;
  flex-direction: column;
  gap: .5rem;
  padding: 1.1rem 1.2rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-md);
  background: var(--color-surface);
  text-decoration: none;
  transition: all var(--transition);
  animation: cardIn .4s ease both;
}
.article-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.article-card-meta { display:flex; align-items:center; gap:.5rem; font-size:.72rem; }
.article-card-title { font-family:var(--font-round); font-size:.9rem; font-weight:800; color:var(--color-heading); line-height:1.4; letter-spacing:.5px; }
.article-card-excerpt { font-size:.78rem; color:var(--color-text-muted); line-height:1.55; display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; }

/* ─── 文章內文 ─── */
.article-content { line-height:1.9; }
.article-content h2 { font-size:1.3rem; margin:2.5rem 0 1rem; padding-bottom:.5rem; border-bottom:1.5px solid var(--color-border); }
.article-content h3 { font-size:1.1rem; margin:2rem 0 .75rem; }
.article-content ul, .article-content ol { padding-left:1.5rem; margin:1rem 0; }
.article-content li { margin-bottom:.45rem; }
.article-content p { margin-bottom:1.1rem; }
.article-content code { font-family:var(--font-mono); font-size:.83em; background:var(--color-bg-alt); border:1px solid var(--color-border); padding:.15em .4em; border-radius:var(--r-xs); color:var(--color-primary); }

/* ─── 文章內容（Parsedown 輸出）強化樣式 ─── */
.article-content {
  font-size: 1rem;
  line-height: 1.9;
  max-width: 780px;
}

/* 文章內的 h2/h3 縮小（避免與頁面 h1 搶眼） */
.article-content h2 {
  font-size: clamp(1rem, 2vw, 1.25rem);
  margin: 2.25rem 0 .9rem;
  padding-bottom: .5rem;
  border-bottom: 1.5px solid var(--color-border);
  letter-spacing: .5px;
}
.article-content h2:first-child { margin-top: 0; }

.article-content h3 {
  font-size: clamp(.95rem, 1.8vw, 1.05rem);
  margin: 1.75rem 0 .65rem;
  color: var(--color-heading);
  letter-spacing: .5px;
}

/* 程式碼區塊：terminal 風格 */
.article-content pre {
  background: var(--term-bg);
  color: var(--term-text);
  border-radius: var(--r-md);
  padding: 1.1rem 1.25rem;
  overflow-x: auto;
  margin: 1.25rem 0;
  font-family: var(--font-mono);
  font-size: .85rem;
  line-height: 1.72;
  border: 1px solid rgba(255,255,255,.06);
  box-shadow: var(--shadow-sm);
  position: relative;
}

/* 語言標籤小徽章 */
.article-content pre[data-lang]::before,
.article-content pre code[class*="language-"]::before {
  content: attr(data-lang);
  position: absolute;
  top: .5rem;
  right: .75rem;
  font-family: var(--font-body);
  font-size: .62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: rgba(255,255,255,.3);
  pointer-events: none;
}

.article-content pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
  letter-spacing: 0;
}

/* 行內程式碼 */
.article-content code {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--r-xs);
  padding: .14em .42em;
  font-family: var(--font-mono);
  font-size: .83em;
  color: var(--color-primary);
  letter-spacing: 0;
  word-break: break-word;
}

/* 清單 */
.article-content ul,
.article-content ol {
  padding-left: 1.6rem;
  margin: .85rem 0 1rem;
}
.article-content li { margin-bottom: .45rem; line-height: 1.75; }
.article-content li code { font-size: .82em; }

/* 引用區塊（圓角卡片 + 引號裝飾）*/
.article-content blockquote {
  background: var(--color-bg-alt);
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-md);
  padding: 1rem 1.25rem 1rem 3rem;
  margin: 1.25rem 0;
  font-style: italic;
  color: var(--color-text-muted);
  position: relative;
}
.article-content blockquote::before {
  content: '\201C';   /* 左雙引號 " */
  position: absolute;
  left: .7rem;
  top: .4rem;
  font-size: 2rem;
  line-height: 1;
  color: var(--color-primary);
  font-family: Georgia, serif;
  font-style: normal;
  opacity: .6;
}
.article-content blockquote p { margin: 0; }
.article-content blockquote p { margin: 0; }

/* 表格（文章內） */
.article-content table {
  width: 100%;
  border-collapse: collapse;
  font-size: .88rem;
  margin: 1.25rem 0;
  border: 1px solid var(--color-border);
  border-radius: var(--r-md);
  overflow: hidden;
}
.article-content th {
  background: var(--color-bg-alt);
  padding: .6rem .9rem;
  font-weight: 700;
  text-align: left;
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--color-text-muted);
  border-bottom: 2px solid var(--color-border);
}
.article-content td {
  padding: .55rem .9rem;
  border-bottom: 1px solid var(--color-border-light);
  line-height: 1.6;
}
.article-content tr:last-child td { border-bottom: none; }
.article-content tr:hover td { background: var(--color-bg-alt); }

/* 水平分隔線 */
.article-content hr {
  border: none;
  border-top: 1.5px solid var(--color-border);
  margin: 2rem 0;
}

/* 段落間距 */
.article-content p { margin-bottom: 1rem; }
.article-content p:last-child { margin-bottom: 0; }

/* 連結 */
.article-content a {
  color: var(--color-link);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.article-content a:hover { color: var(--color-link-hover); }

/* ─── 文章首圖 ─── */
.article-cover-wrap {
  margin: 0 0 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  line-height: 0;
  border: 1px solid var(--color-border);
}
.article-cover {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 1200 / 630;
}

/* ─── 文章列表縮圖（SVG 等比縮放）─── */
.article-card-cover {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--r-sm) var(--r-sm) 0 0;
  border-bottom: 1px solid var(--color-border);
  /* 強制保持 SVG 的 1200:630 比例 */
  aspect-ratio: 1200 / 630;
  object-fit: fill; /* fill = 完整顯示不裁切，SVG 本身已是向量 */
}
.article-card-body { padding: .85rem 1rem 1rem; }

/* ─── 文章頁右側欄 ─── */
/* ─── 文章頁右側欄 ─── */
.article-right-col {
  position: sticky;
  top: 74px;
  max-height: calc(100vh - 82px);
  overflow-y: auto;
  padding: 2rem 0 2rem 4px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  scrollbar-width: none;           /* 隱藏滾動條保持乾淨 */
}
.article-right-col::-webkit-scrollbar { display: none; }

/* ── 面板共用（TOC / 相關文章） ─── */
.art-toc-wrap,
.art-related-wrap {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition);
}
.art-toc-wrap:hover,
.art-related-wrap:hover { box-shadow: var(--shadow-sm); }

/* 面板標頭 */
.art-panel-header {
  display: flex;
  align-items: center;
  gap: .5rem;
  padding: .7rem 1rem;
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
  font-family: var(--font-round);
  font-size: .72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--color-text-muted);
}
.art-panel-icon {
  font-size: .85rem;
  color: var(--color-primary);
  line-height: 1;
  flex-shrink: 0;
}

/* ── TOC 目錄 ─── */
.art-toc-list {
  list-style: none;
  padding: .45rem 0;
  margin: 0;
}
.art-toc-list li { margin: 0; }

/* h2 項目（小圓點取代左邊框）*/
.art-toc-list li.toc-h2 a {
  display: flex;
  align-items: center;
  gap: .45rem;
  padding: .3rem .75rem;
  font-size: .79rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-decoration: none;
  line-height: 1.5;
  letter-spacing: .2px;
  border-radius: var(--r-xs);
  transition: color 140ms, background 140ms;
  overflow: hidden;
}
.art-toc-list li.toc-h2 a::before {
  content: '';
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--color-border);
  flex-shrink: 0;
  transition: background 140ms, transform 140ms;
}
.art-toc-list li.toc-h2 a:hover { color: var(--color-heading); background: var(--color-bg-alt); }
.art-toc-list li.toc-h2 a:hover::before { background: var(--color-text-muted); }

/* h3 子項目 */
.art-toc-list li.toc-sub a {
  display: flex;
  align-items: center;
  gap: .45rem;
  padding: .22rem .75rem .22rem 1.35rem;
  font-size: .74rem;
  font-weight: 500;
  color: var(--color-text-faint);
  text-decoration: none;
  line-height: 1.5;
  letter-spacing: .2px;
  border-radius: var(--r-xs);
  transition: color 140ms, background 140ms;
  overflow: hidden;
}
.art-toc-list li.toc-sub a::before {
  content: '';
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--color-border-light);
  flex-shrink: 0;
  transition: background 140ms;
}
.art-toc-list li.toc-sub a:hover { color: var(--color-text-muted); background: var(--color-bg-alt); }
.art-toc-list li.toc-sub a:hover::before { background: var(--color-border); }

/* 當前閱讀段落高亮 */
.art-toc-list a.toc-active {
  color: var(--color-primary) !important;
  font-weight: 700;
  background: var(--color-primary-bg) !important;
}
.art-toc-list a.toc-active::before {
  background: var(--color-primary) !important;
  transform: scale(1.4);
}

/* ── 相關文章 ─── */
.art-related-list {
  list-style: none;
  padding: .35rem .6rem;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: .2rem;
}
.art-related-list li { margin: 0; }

.art-related-item {
  display: flex;
  align-items: center;
  gap: .65rem;
  padding: .5rem .4rem;
  border-radius: var(--r-sm);
  text-decoration: none;
  transition: background 140ms;
}
.art-related-item:hover { background: var(--color-bg-alt); }

/* 迷你縮圖 */
.art-related-thumb {
  width: 56px;
  height: 30px;
  border-radius: var(--r-xs);
  flex-shrink: 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-bg-alt);
}
.art-related-thumb img {
  width: 100%;
  height: 100%;
  object-fit: fill;
  display: block;
}

/* 文字區 */
.art-related-info { flex: 1; min-width: 0; }
.art-related-text {
  font-size: .77rem;
  font-weight: 600;
  color: var(--color-text);
  line-height: 1.45;
  letter-spacing: .2px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.art-related-item:hover .art-related-text { color: var(--color-primary); }
.art-related-date {
  font-size: .67rem;
  color: var(--color-text-faint);
  margin-top: .15rem;
  letter-spacing: .3px;
}

/* 行動版：隱藏右側欄 */
@media (max-width: 1100px) {
  .article-right-col { display: none; }
}

/* ════════════════════════════════════════════════════
   文章列表 — 編輯式格局 (Editorial Grid)
   ════════════════════════════════════════════════════ */

/* ─── 頁面標頭 ─── */
.art-list-header {
  margin-bottom: 2rem;
  border-bottom: 2px solid var(--color-border);
  padding-bottom: 1.25rem;
}
.art-list-title-wrap { margin-bottom: 1rem; }
.art-list-h1 {
  font-family: var(--font-round);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 800;
  letter-spacing: 1px;
  color: var(--color-heading);
  margin: 0 0 .25rem;
  border: none;
  padding: 0;
}
.art-list-label {
  font-size: .65rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--color-primary);
  display: block;
  margin-bottom: .2rem;
}
.art-list-count {
  font-size: .8rem;
  color: var(--color-text-faint);
  margin: 0;
  letter-spacing: .5px;
}

/* ─── 分類標籤列 ─── */
.art-cat-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .4rem;
}
.art-cat-tab {
  display: inline-flex;
  align-items: center;
  gap: .35rem;
  padding: .32rem .75rem;
  border-radius: 99px;
  font-size: .78rem;
  font-weight: 700;
  font-family: var(--font-round);
  letter-spacing: .3px;
  color: var(--color-text-muted);
  text-decoration: none;
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  transition: all 150ms ease;
}
.art-cat-tab:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: var(--color-primary-bg);
}
.art-cat-tab--active {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.art-cat-tab--active:hover { color: #fff; }
.art-cat-cnt {
  font-size: .65rem;
  opacity: .7;
  font-weight: 600;
}

/* ─── 編輯式格局容器 ─── */
.art-editorial {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 1.1rem;
  margin-bottom: 2.5rem;
}

/* ════════════════════
   Hero Card（特集大卡）
   ════════════════════ */
.arc--hero {
  grid-column: 1 / -1;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 380px;
  border-radius: var(--r-xl);
  overflow: hidden;
  text-decoration: none;
  transition: transform 200ms ease, box-shadow 200ms ease;
}
.arc--hero:hover { transform: translateY(-3px); box-shadow: var(--shadow-lg); }

.arc__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 400ms ease;
}
.arc--hero:hover .arc__bg { transform: scale(1.02); }

/* 暗層漸層 */
.arc__veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    0deg,
    rgba(10, 8, 6, .88) 0%,
    rgba(10, 8, 6, .55) 45%,
    rgba(10, 8, 6, .1) 100%
  );
  transition: background 200ms;
}
.arc--hero:hover .arc__veil {
  background: linear-gradient(
    0deg,
    rgba(10, 8, 6, .92) 0%,
    rgba(10, 8, 6, .62) 50%,
    rgba(10, 8, 6, .15) 100%
  );
}

.arc__content {
  position: relative;
  z-index: 1;
  padding: 2rem 2.25rem;
  color: #fff;
}
.arc__meta {
  display: flex;
  align-items: center;
  gap: .65rem;
  margin-bottom: .85rem;
}
.arc__cat {
  font-family: var(--font-round);
  font-size: .68rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .1em;
  background: var(--color-primary);
  color: #fff;
  padding: .2rem .6rem;
  border-radius: 99px;
}
.arc__date {
  font-size: .76rem;
  color: rgba(255,255,255,.55);
  letter-spacing: .5px;
}
.arc__title {
  font-family: var(--font-round);
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.3;
  margin: 0 0 .75rem;
  letter-spacing: .5px;
  border: none;
  padding: 0;
  text-shadow: 0 2px 12px rgba(0,0,0,.4);
}
.arc__excerpt {
  font-size: .85rem;
  color: rgba(255,255,255,.72);
  margin: 0 0 1.1rem;
  line-height: 1.7;
  max-width: 620px;
  letter-spacing: .3px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.arc__cta {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-round);
  font-size: .82rem;
  font-weight: 700;
  color: rgba(255,255,255,.85);
  letter-spacing: .5px;
  border-bottom: 1px solid rgba(255,255,255,.35);
  padding-bottom: 1px;
  transition: color 150ms, border-color 150ms;
}
.arc--hero:hover .arc__cta { color: #fff; border-color: rgba(255,255,255,.7); }
.arc__arrow { transition: transform 200ms; }
.arc--hero:hover .arc__arrow { transform: translateX(3px); }

/* ════════════════════
   Lead Card（中版）
   ════════════════════ */
.arc--lead {
  grid-column: span 6;
  display: flex;
  flex-direction: column;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  text-decoration: none;
  transition: all 180ms ease;
}
.arc--lead:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-3px);
}
.arc__thumb {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--color-bg-alt);
}
.arc__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 350ms ease;
}
.arc--lead:hover .arc__thumb img { transform: scale(1.04); }

.arc__cat-badge {
  position: absolute;
  top: .65rem;
  left: .65rem;
  font-family: var(--font-round);
  font-size: .63rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
  background: rgba(0,0,0,.65);
  color: #fff;
  padding: .2rem .55rem;
  border-radius: 99px;
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
}

.arc__body {
  padding: 1.1rem 1.25rem 1.25rem;
  display: flex;
  flex-direction: column;
  flex: 1;
}
.arc--lead .arc__date {
  font-size: .72rem;
  color: var(--color-text-faint);
  letter-spacing: .5px;
  margin-bottom: .5rem;
  display: block;
}
.arc--lead .arc__title {
  font-family: var(--font-round);
  font-size: clamp(.9rem, 1.8vw, 1.05rem);
  font-weight: 800;
  color: var(--color-heading);
  letter-spacing: .3px;
  line-height: 1.4;
  margin: 0 0 .6rem;
  border: none;
  padding: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.arc--lead:hover .arc__title { color: var(--color-primary); }
.arc--lead .arc__excerpt {
  font-size: .78rem;
  color: var(--color-text-muted);
  line-height: 1.65;
  margin: 0;
  letter-spacing: .2px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ════════════════════
   Grid Card（標準小卡）
   ════════════════════ */
.arc--grid {
  grid-column: span 4;
  display: flex;
  align-items: center;
  gap: .85rem;
  padding: .75rem .85rem;
  border-radius: var(--r-md);
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  text-decoration: none;
  transition: all 150ms ease;
}
.arc--grid:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-bg);
  transform: translateX(3px);
}

.arc__mini-thumb {
  width: 72px;
  height: 38px;
  border-radius: var(--r-xs);
  flex-shrink: 0;
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-bg-alt);
}
.arc__mini-thumb img {
  width: 100%;
  height: 100%;
  object-fit: fill;
  display: block;
}

.arc__mini-body {
  display: flex;
  align-items: flex-start;
  gap: .55rem;
  flex: 1;
  min-width: 0;
}
.arc__cat-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
  margin-top: .42rem;
  background: var(--color-primary);
}
.arc__mini-title {
  font-family: var(--font-round);
  font-size: .8rem;
  font-weight: 700;
  color: var(--color-heading);
  line-height: 1.45;
  margin: 0 0 .18rem;
  letter-spacing: .2px;
  border: none;
  padding: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.arc--grid:hover .arc__mini-title { color: var(--color-primary); }
.arc--grid .arc__date {
  font-size: .68rem;
  color: var(--color-text-faint);
  letter-spacing: .3px;
  display: block;
}

/* ─── 進場動畫 ─── */
@keyframes arcFadeUp {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}
.arc { animation: arcFadeUp .45s ease both; }
.arc--hero  { animation-delay: .05s; }
.arc--lead:nth-child(2) { animation-delay: .12s; }
.arc--lead:nth-child(3) { animation-delay: .18s; }
.arc--grid:nth-child(4)  { animation-delay: .22s; }
.arc--grid:nth-child(5)  { animation-delay: .27s; }
.arc--grid:nth-child(6)  { animation-delay: .32s; }
.arc--grid:nth-child(7)  { animation-delay: .37s; }
.arc--grid:nth-child(8)  { animation-delay: .42s; }
.arc--grid:nth-child(9)  { animation-delay: .47s; }
.arc--grid:nth-child(10) { animation-delay: .52s; }
.arc--grid:nth-child(n+11) { animation-delay: .55s; }

/* ─── 分頁 ─── */
.art-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--color-border);
  margin-top: 1rem;
}
.art-page-btn {
  font-family: var(--font-round);
  font-size: .82rem;
  font-weight: 700;
  padding: .5rem 1rem;
  border-radius: var(--r-sm);
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: all 150ms;
}
.art-page-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.art-page-nums { display: flex; gap: .35rem; }
.art-page-num {
  width: 36px; height: 36px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--r-sm);
  font-size: .82rem;
  font-weight: 700;
  font-family: var(--font-round);
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: all 150ms;
}
.art-page-num:hover { border-color: var(--color-primary); color: var(--color-primary); }
.art-page-num--active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

/* ─── 響應式 ─── */
@media (max-width: 1100px) {
  .arc--grid { grid-column: span 6; }
}
@media (max-width: 768px) {
  .arc--hero  { min-height: 260px; }
  .arc__content { padding: 1.25rem 1.25rem; }
  .arc--lead  { grid-column: 1 / -1; }
  .arc--grid  { grid-column: 1 / -1; }
  .art-cat-tabs { gap: .3rem; }
  .art-cat-tab  { font-size: .72rem; padding: .28rem .6rem; }
  .art-pagination { flex-direction: column; }
}

/* ─── 難度圓點 ─── */
.diff-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 0 2px rgba(255,255,255,.6);
}
.diff-dot--begin { background: #26a04a; }
.diff-dot--inter { background: #d4890a; }
.diff-dot--adv   { background: #d43a2a; }

/* cmd-card 裡的圓點（替換原本的 icon） */
.cmd-card > .diff-dot {
  margin-top: .28rem;
}

/* ─── 難度圖例（首頁熱門指令旁）─── */
.diff-legend {
  display: flex;
  align-items: center;
  gap: 1rem;
}
.diff-legend-item {
  display: flex;
  align-items: center;
  gap: .38rem;
  font-size: .72rem;
  font-weight: 600;
  color: var(--color-text-muted);
  letter-spacing: .3px;
}

/* ─── Header 即時搜尋下拉 ─── */
#header-search-wrap { position: relative; }
.search-drop {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  width: 360px;
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lg);
  z-index: 500;
  overflow: hidden;
  animation: dropIn .15s ease both;
}
@keyframes dropIn {
  from { opacity: 0; transform: translateY(-6px); }
  to   { opacity: 1; transform: translateY(0); }
}
.search-drop-item {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-rows: auto auto;
  column-gap: .6rem;
  row-gap: .12rem;
  padding: .65rem 1rem;
  text-decoration: none;
  border-bottom: 1px solid var(--color-border-light);
  transition: background 120ms;
  align-items: start;
}
.search-drop-item:hover,
.search-drop-item:focus {
  background: var(--color-primary-bg);
  outline: none;
}
.search-drop-name {
  grid-column: 1;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: .86rem;
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0;
  align-self: center;
}
.search-drop-summary {
  grid-column: 2;
  grid-row: 1 / 3;
  font-size: .76rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  letter-spacing: .2px;
  align-self: center;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.search-drop-cat {
  grid-column: 3;
  grid-row: 1;
  font-size: .62rem;
  font-weight: 700;
  font-family: var(--font-round);
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--color-text-faint);
  align-self: center;
  white-space: nowrap;
}
.search-drop-more {
  display: block;
  padding: .55rem 1rem;
  font-size: .78rem;
  font-weight: 700;
  font-family: var(--font-round);
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: .3px;
  text-align: center;
  background: var(--color-bg-alt);
  transition: background 120ms;
}
.search-drop-more:hover { background: var(--color-primary-bg); }

/* ─── 文章頁：指令參考區塊 ─── */
.art-cmd-links {
  margin: 2rem 0;
  padding: 1rem 1.1rem;
  background: var(--color-bg-alt);
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-md);
}
.art-cmd-links-title {
  font-family: var(--font-round);
  font-size: .72rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--color-text-muted);
  margin-bottom: .75rem;
}
.art-cmd-links-grid { display: flex; flex-direction: column; gap: .5rem; }
.art-cmd-chip {
  display: flex;
  align-items: baseline;
  gap: .6rem;
  text-decoration: none;
  padding: .45rem .6rem;
  border-radius: var(--r-sm);
  border: 1.5px solid var(--color-border);
  background: var(--color-surface);
  transition: border-color 140ms, background 140ms;
}
.art-cmd-chip:hover { border-color: var(--color-primary); background: var(--color-primary-bg); }
.art-cmd-chip code { font-size: .88rem; color: var(--color-primary); letter-spacing: 0; }
.art-cmd-chip span { font-size: .76rem; color: var(--color-text-muted); }

/* ─── 指令頁：相關文章 ─── */
.cmd-related-articles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: .85rem;
  margin: 1rem 0;
}
.cmd-rel-art {
  display: flex;
  flex-direction: column;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1.5px solid var(--color-border);
  text-decoration: none;
  transition: all 150ms;
}
.cmd-rel-art:hover { border-color: var(--color-primary); box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.cmd-rel-art img { width: 100%; aspect-ratio: 1200/630; object-fit: fill; display: block; }
.cmd-rel-art-title { padding: .55rem .75rem; font-size: .78rem; font-weight: 600; color: var(--color-heading); line-height: 1.45; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.cmd-rel-art:hover .cmd-rel-art-title { color: var(--color-primary); }

/* ─── Skip Link（A11y）─── */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 9999;
  padding: .6rem 1.2rem;
  background: var(--color-primary);
  color: #fff;
  border-radius: 0 0 var(--r-md) var(--r-md);
  font-family: var(--font-round);
  font-weight: 700;
  font-size: .9rem;
  text-decoration: none;
  transition: top 150ms;
}
.skip-link:focus { top: 0; }

/* ─── 三大理由 ─── */
.why-section {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 3.5rem 1.5rem;
}
.why-inner { max-width: 1200px; margin: 0 auto; }
.why-title {
  font-family: var(--font-round);
  font-size: clamp(1.2rem, 2.5vw, 1.6rem);
  font-weight: 800;
  text-align: center;
  color: var(--color-heading);
  letter-spacing: 1px;
  margin: 0 0 2.5rem;
  border: none;
  padding: 0;
}
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.why-card {
  background: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--r-xl);
  padding: 1.75rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: .75rem;
  transition: box-shadow var(--transition), transform var(--transition);
}
.why-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.why-icon {
  width: 52px;
  height: 52px;
  background: var(--color-primary-bg);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}
.why-card h3 {
  font-family: var(--font-round);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--color-heading);
  letter-spacing: .5px;
  margin: 0;
}
.why-card p {
  font-size: .85rem;
  color: var(--color-text-muted);
  line-height: 1.78;
  margin: 0;
  letter-spacing: .3px;
}
@media (max-width: 900px) {
  .why-grid { grid-template-columns: 1fr; }
}

/* ─── 作者授信區 ─── */
.author-trust {
  background: linear-gradient(135deg, var(--color-primary-bg) 0%, var(--color-bg) 100%);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding: 1.75rem 1.5rem;
}
.author-trust-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}
.author-avatar {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--moss-700), var(--moss-500));
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: .9rem;
  color: #fff;
  font-weight: 600;
  flex-shrink: 0;
  letter-spacing: -1px;
  box-shadow: 0 2px 10px rgba(38,115,60,.3);
}
.author-bio { flex: 1; min-width: 240px; }
.author-name { font-family: var(--font-round); font-size: .95rem; font-weight: 800; color: var(--color-heading); display: block; margin-bottom: .15rem; letter-spacing: .5px; }
.author-tag  { font-size: .72rem; font-weight: 700; color: var(--color-primary); font-family: var(--font-round); text-transform: uppercase; letter-spacing: .08em; display: block; margin-bottom: .4rem; }
.author-bio p { font-size: .8rem; color: var(--color-text-muted); margin: 0; line-height: 1.65; letter-spacing: .3px; }
.author-link { font-family: var(--font-round); font-size: .8rem; font-weight: 700; color: var(--color-primary); text-decoration: none; white-space: nowrap; padding: .45rem .9rem; border: 1.5px solid var(--color-primary-light); border-radius: var(--r-sm); transition: background 140ms; }
.author-link:hover { background: var(--color-primary-bg); }

/* ════════════════════════════════════════════════════
   文章水平列表（文字左 · 縮圖右）
   ════════════════════════════════════════════════════ */
.art-rows {
  list-style: none;
  padding: 0;
  margin: 0;
  border-top: 1.5px solid var(--color-border);
}

.art-row {
  border-bottom: 1px solid var(--color-border-light);
  animation: rowFade .4s ease both;
  animation-delay: var(--delay, 0s);
}
@keyframes rowFade {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.art-row-link {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 1.35rem 0;
  text-decoration: none;
  transition: background 140ms;
  border-radius: var(--r-sm);
}
.art-row-link:hover { background: var(--color-bg-alt); padding-left: .75rem; padding-right: .75rem; margin: 0 -.75rem; }

/* ── 左側文字區 ── */
.art-row-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: .3rem;
}

.art-row-meta {
  display: flex;
  align-items: center;
  gap: .55rem;
}
.art-row-cat {
  font-family: var(--font-round);
  font-size: .65rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: var(--color-primary);
  background: var(--color-primary-bg);
  padding: .15rem .5rem;
  border-radius: 99px;
}
.art-row-date {
  font-size: .74rem;
  color: var(--color-text-faint);
  letter-spacing: .3px;
}

.art-row-title {
  font-family: var(--font-round);
  font-size: clamp(.95rem, 1.8vw, 1.1rem);
  font-weight: 800;
  color: var(--color-heading);
  line-height: 1.4;
  letter-spacing: .3px;
  margin: 0;
  border: none;
  padding: 0;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.art-row-link:hover .art-row-title { color: var(--color-primary); }

.art-row-excerpt {
  font-size: .8rem;
  color: var(--color-text-muted);
  line-height: 1.72;
  letter-spacing: .2px;
  margin: 0;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.art-row-cta {
  font-family: var(--font-round);
  font-size: .72rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: .3px;
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity 150ms, transform 150ms;
  align-self: flex-start;
  margin-top: .2rem;
}
.art-row-link:hover .art-row-cta { opacity: 1; transform: translateX(0); }

/* ── 右側縮圖 ── */
.art-row-thumb {
  width: 300px;
  height: 158px;
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1.5px solid var(--color-border);
  flex-shrink: 0;
  background: var(--color-bg-alt);
  transition: border-color 150ms;
}
.art-row-link:hover .art-row-thumb { border-color: var(--color-primary); }
.art-row-thumb img {
  width: 100%;
  height: 100%;
  object-fit: fill;
  display: block;
  transition: transform 300ms ease;
}
.art-row-link:hover .art-row-thumb img { transform: scale(1.03); }

/* ── 響應式 ── */
@media (max-width: 900px) {
  .art-row-thumb { width: 240px; height: 126px; }
}
@media (max-width: 640px) {
  .art-row-link { flex-direction: column; gap: .85rem; padding: 1.1rem 0; }
  .art-row-link:hover { padding-left: .5rem; padding-right: .5rem; margin: 0 -.5rem; }
  .art-row-thumb { width: 100%; height: auto; aspect-ratio: 1200/630; }
}