/* ============================================================
   PBTW 菲比尋常 AI 助航 — 「航海日誌 × 登機證」設計系統
   米紙底 × 墨藍 × 燒橙;Noto Serif TC 標題 + Fraunces 數字
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --paper: #FAF5EC;            /* 米紙底 */
  --surface: #FFFDF7;          /* 卡片紙面 */
  --surface-alt: #F1EADD;      /* 程式碼/淺塊 */
  --ink: #1F2A37;              /* 墨藍主文字 */
  --ink-soft: #5B6776;         /* 次要文字 */
  --line: #D9CFBE;             /* 沙色框線 */
  --line-strong: #1F2A37;      /* 墨線 */
  --accent: #E8590C;           /* 燒橙(大字/圖形用) */
  --accent-deep: #C2410C;
  --accent-text: #C2410C;      /* 燒橙小字版(過 4.5:1) */
  --primary: #2563EB;          /* 航線藍(連結) */
  --primary-light: #EAF0FE;
  --primary-dark: #1D4ED8;
  --board: #16202F;            /* 航班表底 */
  --board-text: #F4EEDF;
  --warm-light: #FFF7E8;
  --ext-border: #EAD9B8;
  --header-bg: rgba(250,245,236,.92);
  /* 相容舊變數名 */
  --text: var(--ink);
  --text-light: var(--ink-soft);
  --bg: var(--paper);
  --bg-warm: #F4EDE0;
  --bg-dark: #131C2B;
  --border: var(--line);
  --shadow-hard: 4px 4px 0 rgba(31,42,55,.14);
  --shadow-hard-lg: 7px 7px 0 rgba(31,42,55,.16);
  --shadow-sm: 0 1px 2px rgba(31,42,55,.06);
  --shadow: var(--shadow-hard);
  --shadow-md: var(--shadow-hard);
  --shadow-lg: var(--shadow-hard-lg);
  --radius: 14px;
  --radius-lg: 18px;
  --max-w: 1120px;
  --font: 'Noto Sans TC', -apple-system, 'Segoe UI', sans-serif;
  --font-display: 'Noto Serif TC', serif;
  --font-num: 'Fraunces', 'Noto Serif TC', serif;
}

/* ── 夜航海圖(深色) ── */
html[data-theme="dark"] {
  color-scheme: dark;
  --paper: #0F1828;
  --surface: #182338;
  --surface-alt: #20304B;
  --ink: #EDE6D6;
  --ink-soft: #9DA8B8;
  --line: #2C3A55;
  --line-strong: #EDE6D6;
  --accent: #FF7A2F;
  --accent-deep: #FFA45C;
  --accent-text: #FF8A47;
  --primary: #6CA1FF;
  --primary-light: #1C2C49;
  --primary-dark: #9DC0FF;
  --board: #0A111E;
  --board-text: #F4EEDF;
  --warm-light: #1D2435;
  --ext-border: #4A3F28;
  --header-bg: rgba(15,24,40,.92);
  --bg-warm: #131D30;
  --bg-dark: #0A111E;
  --shadow-hard: 4px 4px 0 rgba(0,0,0,.45);
  --shadow-hard-lg: 7px 7px 0 rgba(0,0,0,.5);
}

html { font-family: var(--font); color: var(--ink); background: var(--paper); line-height: 1.85; font-size: 16px; scroll-behavior: smooth; }
body { min-height: 100dvh; display: flex; flex-direction: column; overflow-x: clip; position: relative; }
/* 紙紋噪點 */
body::before { content: ''; position: fixed; inset: 0; pointer-events: none; z-index: 1;
  opacity: .35; mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E"); }
html[data-theme="dark"] body::before { mix-blend-mode: screen; opacity: .25; }
header, main, footer { position: relative; z-index: 2; }

img { max-width: 100%; height: auto; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--accent-text); }
.container { max-width: var(--max-w); margin: 0 auto; padding: 0 1.25rem; width: 100%; }
::selection { background: var(--accent); color: #fff; }

/* ============ Header ============ */
.site-header { border-bottom: 2px solid var(--line-strong); background: var(--header-bg); backdrop-filter: blur(8px); position: sticky; top: 0; z-index: 100; }
.header-inner { max-width: var(--max-w); margin: 0 auto; padding: .8rem 1.25rem; display: flex; align-items: center; gap: 1rem; }
.logo { display: inline-flex; align-items: center; gap: .5rem; font-family: var(--font-display); font-size: 1.05rem; font-weight: 900; color: var(--ink); letter-spacing: .02em; margin-right: auto; white-space: nowrap; }
.logo-mark { color: var(--accent); flex-shrink: 0; transform: rotate(-8deg); transition: transform .3s; }
.logo:hover .logo-mark { transform: rotate(8deg) translateX(2px); }
.logo span { font-family: var(--font-num); font-weight: 900; color: var(--accent); letter-spacing: .04em; }
.logo:hover { color: var(--ink); }
.main-nav { display: flex; gap: 1.4rem; align-items: center; }
.main-nav a, .main-nav .dropdown-toggle { color: var(--ink-soft); font-size: .92rem; font-weight: 500; }
.main-nav a:hover { color: var(--accent-text); }
.nav-cta { background: var(--accent); color: #fff !important; padding: .45rem 1rem; border-radius: 999px; font-size: .85rem; border: 2px solid var(--line-strong); box-shadow: 3px 3px 0 rgba(31,42,55,.2); transition: transform .15s, box-shadow .15s; }
.nav-cta:hover { transform: translate(-1px,-1px); box-shadow: 4px 4px 0 rgba(31,42,55,.25); }

/* 課程下拉 */
.nav-dropdown { position: relative; }
.dropdown-toggle { background: none; border: none; cursor: pointer; font-family: var(--font); padding: 0; display: inline-flex; align-items: center; gap: .25rem; }
.dropdown-toggle:hover { color: var(--accent-text); }
.dropdown-toggle .caret { font-size: .7em; }
.dropdown-menu { display: none; position: absolute; top: calc(100% + .7rem); left: 50%; transform: translateX(-50%); background: var(--surface); border: 2px solid var(--line-strong); border-radius: var(--radius); box-shadow: var(--shadow-hard); padding: .5rem; min-width: 230px; }
/* 透明橋:填滿按鈕與選單間的空隙,避免滑鼠經過時 hover 中斷導致選單提前關閉 */
.dropdown-menu::before { content: ''; position: absolute; top: -.85rem; left: -2px; right: -2px; height: .85rem; }
.dropdown-menu a { display: block; padding: .55rem .85rem; border-radius: 9px; font-size: .9rem; color: var(--ink); white-space: nowrap; }
.dropdown-menu a:hover { background: var(--warm-light); color: var(--accent); }
.nav-dropdown.open .dropdown-menu { display: block; }
@media (hover: hover) { .nav-dropdown:hover .dropdown-menu { display: block; } }

/* 深淺色切換 */
.theme-toggle { background: none; border: 2px solid transparent; cursor: pointer; color: var(--ink-soft); width: 36px; height: 36px; display: inline-flex; align-items: center; justify-content: center; border-radius: 999px; flex-shrink: 0; }
.theme-toggle:hover { color: var(--accent); border-color: var(--line); background: var(--surface); }
.theme-toggle .icon-sun { display: none; }
html[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
html[data-theme="dark"] .theme-toggle .icon-moon { display: none; }

/* 漢堡 */
.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: .5rem; width: 42px; height: 42px; flex-direction: column; justify-content: center; gap: 5px; }
.nav-toggle span { display: block; width: 22px; height: 2px; background: var(--ink); border-radius: 2px; transition: transform .25s, opacity .25s; }
body.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
body.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============ Buttons ============ */
.btn { display: inline-flex; align-items: center; gap: .5rem; padding: .8rem 1.6rem; border-radius: 999px; font-size: 1rem; font-weight: 700; cursor: pointer; border: 2px solid var(--line-strong); text-decoration: none !important; transition: transform .15s, box-shadow .15s; box-shadow: var(--shadow-hard); font-family: var(--font); }
.btn:hover { transform: translate(-2px,-2px); box-shadow: 6px 6px 0 rgba(31,42,55,.2); }
.btn:active { transform: translate(1px,1px); box-shadow: 2px 2px 0 rgba(31,42,55,.2); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { color: #fff; }
.btn-secondary { background: var(--surface); color: var(--ink); }
.btn-secondary:hover { color: var(--accent); }
.btn-white { background: var(--board-text); color: var(--board); border-color: var(--board-text); box-shadow: 4px 4px 0 rgba(0,0,0,.35); }
.btn-white:hover { color: var(--board); }
.btn-lg { padding: 1rem 2.1rem; font-size: 1.05rem; }
.text-link { display: inline-flex; align-items: center; gap: .3rem; font-size: .9rem; font-weight: 700; color: var(--primary); border-bottom: 2px dashed transparent; }
.text-link:hover { color: var(--accent-text); border-bottom-color: var(--accent-text); text-decoration: none; }
.text-link-lg { font-size: 1.05rem; }

/* ============ Sections ============ */
.section { padding: 5.5rem 0; position: relative; }
.section-warm { background: var(--bg-warm); border-top: 2px dashed var(--line); border-bottom: 2px dashed var(--line); }
.section-dark { background: var(--bg-dark); color: var(--board-text); }
.section-title { font-family: var(--font-display); font-size: clamp(1.6rem, 4vw, 2.2rem); font-weight: 900; margin-bottom: .5rem; line-height: 1.4; letter-spacing: .01em; }
.section-subtitle { font-size: 1.02rem; color: var(--ink-soft); max-width: 640px; line-height: 1.9; }
.section-header { text-align: center; margin-bottom: 3rem; }
.section-header .section-subtitle { margin: .5rem auto 0; }
/* 章節郵戳 */
.eyebrow { display: inline-flex; align-items: center; gap: .5rem; font-family: var(--font-num); font-size: .78rem; font-weight: 700; letter-spacing: .22em; text-transform: uppercase; color: var(--accent-text); border: 1.5px solid var(--accent); border-radius: 4px; padding: .2rem .7rem; margin-bottom: 1rem; transform: rotate(-1.5deg); background: var(--surface); }

/* ============ Hero ============ */
.hero { padding: 4.5rem 0 5rem; position: relative; overflow: hidden; }
.hero::after { content: ''; position: absolute; left: -5%; right: -5%; bottom: 56px; height: 2px; border-bottom: 2px dashed var(--line); transform: rotate(-1.2deg); }
.hero-inner { display: grid; grid-template-columns: 1fr; gap: 3rem; align-items: center; position: relative; z-index: 2; }
.hero-text h1 { font-family: var(--font-display); font-size: clamp(1.7rem, 4.6vw, 2.7rem); font-weight: 900; line-height: 1.45; margin-bottom: 1.1rem; }
.hero-text h1 em { font-style: normal; color: var(--accent); position: relative; white-space: nowrap; }
.hero-text h1 em::after { content: ''; position: absolute; left: 0; right: 0; bottom: .08em; height: .38em; background: var(--accent); opacity: .16; border-radius: 3px; z-index: -1; }
.hero-text .subtitle { font-size: 1.05rem; color: var(--ink-soft); line-height: 2; margin-bottom: 1.5rem; max-width: 540px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: .55rem; margin-bottom: 2rem; }
.hero-tags span { background: var(--surface); color: var(--ink); border: 1.5px solid var(--line-strong); padding: .3rem .85rem; border-radius: 4px; font-size: .82rem; font-weight: 500; box-shadow: 2px 2px 0 rgba(31,42,55,.12); transform: rotate(-.6deg); }
.hero-tags span:nth-child(even) { transform: rotate(.8deg); }
.hero-cta { display: flex; flex-wrap: wrap; gap: .9rem; align-items: center; }

/* 航班表 Departure Board */
.route-board { background: var(--board); border: 2px solid var(--line-strong); border-radius: var(--radius-lg); box-shadow: var(--shadow-hard-lg); overflow: hidden; transform: rotate(.6deg); }
.route-board-head { display: flex; align-items: center; justify-content: space-between; padding: .8rem 1.2rem; border-bottom: 1px dashed rgba(244,238,223,.3); color: var(--board-text); }
.route-board-head .rb-title { font-family: var(--font-num); font-size: .8rem; letter-spacing: .3em; text-transform: uppercase; opacity: .85; }
.route-board-head .rb-dot { width: 9px; height: 9px; border-radius: 50%; background: #5BE38A; box-shadow: 0 0 8px #5BE38A; animation: blink 2.4s infinite; }
@keyframes blink { 0%,100% { opacity: 1 } 50% { opacity: .3 } }
.route-row { display: grid; grid-template-columns: 52px 1fr auto; gap: .9rem; align-items: center; padding: .85rem 1.2rem; color: var(--board-text); border-bottom: 1px solid rgba(244,238,223,.08); transition: background .15s, padding-left .15s; }
.route-row:last-child { border-bottom: none; }
.route-row:hover { background: rgba(244,238,223,.07); padding-left: 1.5rem; color: var(--board-text); }
.route-row .rr-num { font-family: var(--font-num); font-weight: 900; font-size: 1.15rem; color: var(--rc, #6CA1FF); }
.route-row .rr-name { font-weight: 700; font-size: .95rem; display: block; }
.route-row .rr-dest { font-size: .78rem; opacity: .65; display: block; }
.route-row .rr-status { font-size: .7rem; font-weight: 700; letter-spacing: .12em; padding: .22rem .6rem; border: 1px solid var(--rc, #6CA1FF); color: var(--rc, #6CA1FF); border-radius: 3px; white-space: nowrap; }

/* ============ Trust bar ============ */
.trust-bar { background: var(--board); color: var(--board-text); padding: 1.1rem 0; border-top: 2px solid var(--line-strong); border-bottom: 2px solid var(--line-strong); }
.trust-bar .container { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: .75rem 1.5rem; text-align: center; }
.trust-bar p { font-size: .95rem; }
.trust-bar strong { color: var(--accent-deep); }
html[data-theme="dark"] .trust-bar strong { color: var(--accent); }
.trust-badges { display: flex; flex-wrap: wrap; gap: .45rem; justify-content: center; }
.trust-badges-center { margin-top: 2rem; }
.badge { background: transparent; border: 1px dashed rgba(244,238,223,.5); color: var(--board-text); font-size: .76rem; font-weight: 500; padding: .18rem .7rem; border-radius: 3px; letter-spacing: .08em; }
.section .trust-badges-center .badge { border-color: var(--ink-soft); color: var(--ink-soft); }

/* ============ 卡片家族(成果/適合誰/資源) ============ */
.outcome-grid, .audience-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 1.4rem; }
.outcome-card, .audience-card { display: flex; flex-direction: column; background: var(--surface); border: 2px solid var(--line-strong); border-radius: var(--radius); padding: 1.75rem; transition: transform .18s, box-shadow .18s; box-shadow: var(--shadow-hard); position: relative; }
.outcome-card:hover, .audience-card:hover { transform: translate(-2px,-2px) rotate(-.4deg); box-shadow: var(--shadow-hard-lg); text-decoration: none; }
.outcome-card .card-icon, .audience-card .card-icon { width: 48px; height: 48px; border-radius: 12px; display: flex; align-items: center; justify-content: center; margin-bottom: 1rem; border: 1.5px solid var(--card-color, var(--primary)); background: color-mix(in srgb, var(--card-color, var(--primary)) 10%, var(--surface)); color: var(--card-color, var(--primary)); }
.outcome-card h3, .audience-card h3 { font-family: var(--font-display); font-size: 1.05rem; font-weight: 700; margin-bottom: .5rem; color: var(--ink); }
.outcome-card p, .audience-card p { font-size: .9rem; color: var(--ink-soft); line-height: 1.8; flex: 1; margin-bottom: .75rem; }

/* 課程卡(登機證) */
.pathway-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 1.6rem; }
.pathway-card { background: var(--surface); border: 2px solid var(--line-strong); border-radius: var(--radius-lg); padding: 2rem; display: flex; flex-direction: column; transition: transform .18s, box-shadow .18s; position: relative; overflow: hidden; box-shadow: var(--shadow-hard); }
.pathway-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 6px; background: repeating-linear-gradient(90deg, var(--card-color, var(--primary)) 0 14px, transparent 14px 22px); }
.pathway-card::after { content: ''; position: absolute; top: 50%; left: -9px; width: 16px; height: 16px; border-radius: 50%; background: var(--paper); border: 2px solid var(--line-strong); }
.pathway-card:hover { transform: translate(-2px,-3px) rotate(-.5deg); box-shadow: var(--shadow-hard-lg); }
.pathway-card .card-number { font-family: var(--font-num); font-size: 1.3rem; font-weight: 900; color: var(--card-color, var(--primary)); margin-bottom: .8rem; }
.pathway-card h3 { font-family: var(--font-display); font-size: 1.2rem; font-weight: 900; margin-bottom: .5rem; }
.pathway-card .course-fit { font-size: .8rem; font-weight: 700; color: color-mix(in srgb, var(--card-color, var(--primary)) 70%, var(--ink)); margin-bottom: .5rem; }
.pathway-card p { font-size: .9rem; color: var(--ink-soft); line-height: 1.85; flex: 1; margin-bottom: 1.5rem; }
.pathway-card .card-cta { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.pathway-card .btn { padding: .6rem 1.3rem; font-size: .9rem; }

/* 資源卡 */
.resource-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 1.4rem; margin-bottom: 2.5rem; }
.resource-card { background: var(--surface); border: 2px dashed var(--line-strong); border-radius: var(--radius); padding: 1.5rem; text-align: center; transition: transform .18s, border-style .18s; }
.resource-card:hover { transform: translateY(-3px) rotate(.5deg); border-style: solid; box-shadow: var(--shadow-hard); }
.resource-card .card-icon { width: 52px; height: 52px; margin: 0 auto .75rem; border-radius: 14px; display: flex; align-items: center; justify-content: center; border: 1.5px solid var(--card-color, var(--primary)); background: color-mix(in srgb, var(--card-color, var(--primary)) 10%, var(--surface)); color: var(--card-color, var(--primary)); }
.resource-card h3 { font-family: var(--font-display); font-size: .98rem; font-weight: 700; margin-bottom: .25rem; }
.resource-card p { font-size: .8rem; color: var(--ink-soft); }
.resource-cta { text-align: center; }
.resource-cta p { font-size: .9rem; color: var(--ink-soft); margin-bottom: 1.1rem; }

/* ============ 文章 tabs 與卡片 ============ */
.article-tabs { display: flex; flex-wrap: wrap; gap: .55rem; justify-content: center; margin-bottom: 2.5rem; }
.article-tab { padding: .5rem 1.25rem; border-radius: 999px; font-size: .9rem; font-weight: 700; color: var(--ink-soft); background: var(--surface); border: 2px solid var(--line); cursor: pointer; transition: all .15s; font-family: var(--font); }
.article-tab:hover { border-color: var(--line-strong); color: var(--ink); }
.article-tab.active { background: var(--ink); color: var(--paper); border-color: var(--line-strong); box-shadow: 3px 3px 0 rgba(31,42,55,.18); }
html[data-theme="dark"] .article-tab.active { background: var(--board-text); color: var(--board); }
.article-category-group { display: none; }
.article-category-group.active { display: block; }
.article-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; }
.article-card { background: var(--surface); border: 2px solid var(--line); border-radius: var(--radius); overflow: hidden; transition: transform .18s, box-shadow .18s, border-color .18s; }
.article-card:hover { transform: translate(-2px,-2px); box-shadow: var(--shadow-hard); border-color: var(--line-strong); }
.article-card-body { padding: 1.5rem; }
.article-card .cat-tag { font-family: var(--font-num); font-size: .68rem; font-weight: 700; letter-spacing: .14em; color: var(--accent-text); border: 1px solid var(--accent-text); padding: .14rem .55rem; border-radius: 3px; display: inline-block; margin-bottom: .7rem; }
.article-card h3 { font-family: var(--font-display); font-size: 1.02rem; font-weight: 700; margin-bottom: .5rem; line-height: 1.55; }
.article-card h3 a { color: var(--ink); }
.article-card h3 a:hover { color: var(--accent-text); }
.article-card .excerpt { font-size: .87rem; color: var(--ink-soft); line-height: 1.75; margin-bottom: .75rem; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.article-card .meta { display: flex; align-items: center; justify-content: space-between; border-top: 1px dashed var(--line); padding-top: .7rem; }
.article-card .reading-time { font-size: .78rem; color: var(--ink-soft); font-family: var(--font-num); }
.article-card .read-link { font-size: .85rem; font-weight: 700; color: var(--primary); }
.view-all-link { text-align: center; margin-top: 2.2rem; }
.tab-course-hint { text-align: center; margin-top: 1.5rem; font-size: .9rem; color: var(--ink-soft); }
.empty-hint { text-align: center; color: var(--ink-soft); padding: 2rem 0; grid-column: 1 / -1; }

/* ============ 回饋(便箋) ============ */
.testimonial-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.6rem; }
.testimonial-card { background: var(--warm-light); border: 2px solid var(--line-strong); border-radius: 4px; padding: 1.8rem 1.6rem; display: flex; flex-direction: column; box-shadow: var(--shadow-hard); position: relative; transform: rotate(-.8deg); }
.testimonial-card:nth-child(2) { transform: rotate(.7deg); }
.testimonial-card:nth-child(3) { transform: rotate(-.3deg); }
.testimonial-card::before { content: ''; position: absolute; top: -12px; left: 50%; transform: translateX(-50%) rotate(-2deg); width: 86px; height: 22px; background: color-mix(in srgb, var(--accent) 28%, transparent); border: 1px solid color-mix(in srgb, var(--accent) 40%, transparent); }
.testimonial-card blockquote { font-size: .95rem; line-height: 1.95; color: var(--ink); flex: 1; margin-bottom: 1rem; }
.testimonial-card blockquote::before { content: '「'; color: var(--accent); font-weight: 900; font-family: var(--font-display); }
.testimonial-card blockquote::after { content: '」'; color: var(--accent); font-weight: 900; font-family: var(--font-display); }
.testimonial-card figcaption { font-size: .8rem; font-weight: 700; color: var(--ink-soft); letter-spacing: .06em; }

/* ============ CTA ============ */
.cta-section { padding: 4.5rem 0; text-align: center; }
.cta-community { background: var(--bg-warm); border-top: 2px dashed var(--line); }
.cta-enterprise { background: var(--board); color: var(--board-text); border-top: 2px solid var(--line-strong); }
.cta-section h2 { font-family: var(--font-display); font-size: clamp(1.45rem, 4vw, 1.9rem); font-weight: 900; margin-bottom: 1rem; }
.cta-section p { font-size: 1rem; max-width: 620px; margin: 0 auto 2rem; line-height: 1.9; }
.cta-community p { color: var(--ink-soft); }
.cta-enterprise p { color: color-mix(in srgb, var(--board-text) 70%, transparent); }

/* ============ 關於 ============ */
.about-section { text-align: center; background: var(--bg-warm); border-top: 2px dashed var(--line); }
.about-section .about-text { max-width: 640px; margin: 0 auto; font-size: 1rem; color: var(--ink); line-height: 2.1; text-align: left; }
.about-sites { display: flex; justify-content: center; gap: 1rem; margin-top: 2rem; flex-wrap: wrap; }
.about-site { display: flex; flex-direction: column; gap: .15rem; background: var(--surface); border: 2px solid var(--line-strong); border-radius: var(--radius); padding: 1rem 1.5rem; min-width: 200px; transition: transform .18s, box-shadow .18s; box-shadow: var(--shadow-hard); }
.about-site:hover { transform: translate(-2px,-2px) rotate(-.6deg); box-shadow: var(--shadow-hard-lg); text-decoration: none; }
.about-site strong { color: var(--accent); font-family: var(--font-num); font-size: .95rem; }
.about-site span { color: var(--ink-soft); font-size: .82rem; }

/* ============ 課程頁 ============ */
.course-hero { padding: 4.5rem 0; position: relative; border-bottom: 6px solid var(--card-color, var(--primary)); }
.course-hero::after { content: ''; position: absolute; left: 0; right: 0; bottom: -2px; height: 0; border-bottom: 2px dashed var(--paper); }
.course-hero-inner { max-width: 760px; }
.course-badge { display: inline-block; font-family: var(--font-num); font-size: .8rem; font-weight: 700; letter-spacing: .2em; color: #fff; background: var(--card-color, var(--primary)); padding: .28rem .9rem; border-radius: 4px; margin-bottom: 1.1rem; border: 2px solid var(--line-strong); box-shadow: 3px 3px 0 rgba(31,42,55,.18); transform: rotate(-1.5deg); }
.course-hero h1 { font-family: var(--font-display); font-size: clamp(1.7rem, 5vw, 2.5rem); font-weight: 900; line-height: 1.45; margin-bottom: .75rem; }
.course-tagline { font-size: 1.08rem; color: var(--ink-soft); line-height: 2; margin-bottom: 1.5rem; }
.course-facts { list-style: none; margin-bottom: 2rem; display: grid; gap: .55rem; }
.course-facts li { font-size: .95rem; color: var(--ink); }
.course-facts strong { display: inline-block; font-family: var(--font-num); color: color-mix(in srgb, var(--card-color, var(--primary)) 70%, var(--ink)); margin-right: .75rem; font-size: .82rem; letter-spacing: .1em; }
.course-body { padding: 4rem 0; }
.course-body .prose { max-width: 760px; margin: 0 auto; }

/* 獨立頁 */
.page-hero { padding: 3.5rem 0 2.5rem; border-bottom: 2px dashed var(--line); }
.page-hero h1 { font-family: var(--font-display); font-size: clamp(1.7rem, 5vw, 2.3rem); font-weight: 900; line-height: 1.4; }

/* ============ Footer ============ */
.site-footer { background: var(--board); color: color-mix(in srgb, var(--board-text) 65%, transparent); padding: 4rem 0 0; border-top: 4px solid var(--accent); }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2.5rem; padding-bottom: 2.5rem; }
.footer-brand { color: var(--board-text); font-family: var(--font-display); font-size: 1.05rem; font-weight: 900; margin-bottom: .75rem; }
.footer-brand-desc { font-size: .88rem; line-height: 1.9; margin-top: .5rem; }
.footer-col h4 { color: var(--board-text); font-family: var(--font-num); font-size: .8rem; font-weight: 700; letter-spacing: .2em; margin-bottom: 1rem; }
.footer-col a { display: block; font-size: .85rem; color: color-mix(in srgb, var(--board-text) 65%, transparent); margin-bottom: .55rem; }
.footer-col a:hover { color: var(--accent-text); }
.footer-sites { display: flex; gap: 1rem; flex-wrap: wrap; padding-bottom: 2rem; }
.footer-site { display: flex; flex-direction: column; gap: .1rem; background: rgba(244,238,223,.06); border: 1px dashed rgba(244,238,223,.3); border-radius: 10px; padding: .75rem 1.25rem; flex: 1; min-width: 180px; }
.footer-site:hover { background: rgba(244,238,223,.12); }
.footer-site strong { color: var(--board-text); font-family: var(--font-num); font-size: .85rem; }
.footer-site span { font-size: .78rem; }
.footer-bottom { border-top: 1px dashed rgba(244,238,223,.25); padding: 1.5rem 0; text-align: center; font-size: .8rem; }
.footer-bottom a { color: inherit; margin: 0 .5rem; }
.footer-bottom a:hover { color: var(--accent-text); }

/* ============ 文章頁 ============ */
main.article-main { flex: 1; max-width: 760px; margin: 0 auto; padding: 2.5rem 1.25rem; width: 100%; }
.prose h1 { font-family: var(--font-display); font-size: 1.95rem; font-weight: 900; margin-bottom: .5em; line-height: 1.5; }
.prose h2 { font-family: var(--font-display); font-size: 1.45rem; font-weight: 700; margin-top: 2.2rem; margin-bottom: .6em; padding-bottom: .3em; border-bottom: 2px dashed var(--line); }
.prose h3 { font-family: var(--font-display); font-size: 1.18rem; font-weight: 700; margin-top: 1.6rem; margin-bottom: .5em; }
.prose p { margin-bottom: 1em; }
.prose ul, .prose ol { padding-left: 1.5em; margin-bottom: 1em; }
.prose blockquote { border-left: 4px solid var(--accent); background: var(--warm-light); padding: .8em 1.1em; border-radius: 0 10px 10px 0; margin: 1.5em 0; color: var(--ink); font-size: .98rem; }
.prose pre { background: var(--surface-alt); border: 1.5px solid var(--line); padding: 1.25em; padding-top: 2.5em; border-radius: 10px; overflow-x: auto; }
.prose code { background: var(--surface-alt); padding: .2em .4em; border-radius: 4px; font-size: .9em; }
.prose pre code { background: none; padding: 0; }
.prose img { display: block; max-width: min(100%, 620px); height: auto; margin: 1.75em auto; border-radius: var(--radius); border: 2px solid var(--line-strong); box-shadow: var(--shadow-hard); }
.prose table { border-collapse: collapse; width: 100%; font-size: .92rem; }
.prose th, .prose td { border: 1px solid var(--line); padding: .6em .9em; text-align: left; }
.prose th { background: var(--bg-warm); font-weight: 700; }
.table-wrap { overflow-x: auto; margin-bottom: 1.5em; -webkit-overflow-scrolling: touch; border: 1.5px solid var(--line); border-radius: 10px; }
.table-wrap table { margin-bottom: 0; }
.article-hero { display: block; width: 100%; max-width: 100%; border-radius: var(--radius-lg); margin: 0 0 2rem; border: 2px solid var(--line-strong); box-shadow: var(--shadow-hard-lg); }
.yt-embed { display: block; width: 100%; aspect-ratio: 16 / 9; border: 2px solid var(--line-strong); border-radius: var(--radius); margin: 1.25rem 0; background: #000; box-shadow: var(--shadow-hard); }
.mermaid { display: flex; justify-content: center; margin: 1.75em 0; overflow-x: auto; background: var(--surface); border: 1.5px dashed var(--line); border-radius: var(--radius); padding: 1rem; }
.mermaid svg { max-width: 100%; height: auto; }
.post-meta { display: flex; align-items: center; gap: 1rem; color: var(--ink-soft); font-size: .88rem; margin-bottom: 2rem; font-family: var(--font-num); }
.category-link { font-family: var(--font-num); color: var(--accent-text); border: 1px solid var(--accent-text); padding: .15em .6em; border-radius: 3px; font-size: .8rem; font-weight: 700; letter-spacing: .1em; }
.category-link:hover { background: var(--accent); color: #fff; }
.post-tags { margin-top: 2rem; padding-top: 1.5rem; border-top: 2px dashed var(--line); display: flex; gap: .7rem; flex-wrap: wrap; }
.tag { font-size: .82rem; color: var(--ink-soft); background: var(--surface-alt); padding: .25em .65em; border-radius: 4px; }
.tag:hover { color: var(--accent); }

/* 複製按鈕 */
.pre-wrap { position: relative; margin-bottom: 1em; }
.pre-wrap pre { margin-bottom: 0; }
.copy-btn { position: absolute; top: .55em; right: .55em; padding: .25em .85em; font-size: .76rem; font-weight: 700; font-family: var(--font); color: var(--ink-soft); background: var(--surface); border: 1.5px solid var(--line-strong); border-radius: 999px; cursor: pointer; transition: all .15s; box-shadow: 2px 2px 0 rgba(31,42,55,.15); }
.copy-btn:hover { color: var(--accent); transform: translate(-1px,-1px); box-shadow: 3px 3px 0 rgba(31,42,55,.18); }
.copy-btn.copied { color: #15803D; border-color: #15803D; }

/* 延伸學習 */
.extension-cta { margin-top: 2.5rem; background: var(--warm-light); border: 2px dashed var(--accent); border-radius: var(--radius); padding: 1.5rem 1.75rem; position: relative; }
.extension-cta .ext-title { font-family: var(--font-display); font-weight: 900; color: var(--ink); margin-bottom: .5rem; }
.extension-cta p { font-size: .92rem; color: var(--ink-soft); margin-bottom: .35rem; }
.extension-cta a { font-weight: 700; }

/* 列表頁 */
.page-list { padding: 3rem 0 5rem; }
.page-list h1 { font-family: var(--font-display); font-size: 1.7rem; font-weight: 900; margin-bottom: 1.5rem; }
.blog-header { margin-bottom: 2.5rem; }
.blog-header h1 { margin-bottom: .5rem; }
.cat-pills { display: flex; flex-wrap: wrap; gap: .55rem; margin-top: 1.25rem; }
.cat-pill { padding: .4rem 1rem; border-radius: 999px; font-size: .85rem; font-weight: 700; color: var(--ink-soft); background: var(--surface); border: 2px solid var(--line); transition: all .15s; }
.cat-pill:hover { border-color: var(--line-strong); color: var(--ink); box-shadow: 2px 2px 0 rgba(31,42,55,.15); text-decoration: none; }
.page-list .extension-cta { margin: 0 0 2rem; }
.post-list { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.5rem; }
.post-card { border: 2px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.post-card a { color: inherit; display: block; padding: 1.25rem; }
.post-card h2 { font-size: 1.02rem; font-weight: 700; margin-bottom: .3em; line-height: 1.5; }
.post-card time { font-size: .82rem; color: var(--ink-soft); }

/* ============ 進場動畫 ============ */
@media (prefers-reduced-motion: no-preference) {
  .hero-text > * { opacity: 0; transform: translateY(14px); animation: rise .7s cubic-bezier(.2,.7,.3,1) forwards; }
  .hero-text h1 { animation-delay: .05s; }
  .hero-text .subtitle { animation-delay: .15s; }
  .hero-text .hero-tags { animation-delay: .25s; }
  .hero-text .hero-cta { animation-delay: .35s; }
  .route-board { opacity: 0; transform: rotate(.6deg) translateY(18px); animation: rise .8s .3s cubic-bezier(.2,.7,.3,1) forwards; }
  @keyframes rise { to { opacity: 1; transform: translateY(0) rotate(var(--rot, 0deg)); } }
  .route-board { --rot: .6deg; }
}

/* ============ 響應式 ============ */
@media (min-width: 768px) {
  .hero-inner { grid-template-columns: 1.05fr .95fr; }
  .section { padding: 6.5rem 0; }
  .container { padding: 0 2rem; }
  .header-inner { padding: .9rem 2rem; }
  main.article-main { padding: 3rem 2rem; }
}

@media (max-width: 767px) {
  .site-header { backdrop-filter: none; background: var(--paper); }
  .nav-toggle { display: flex; }
  .main-nav { position: fixed; top: 0; right: 0; bottom: 0; width: min(78vw, 320px); background: var(--surface); border-left: 2px solid var(--line-strong); flex-direction: column; align-items: flex-start; gap: .25rem; padding: 4.5rem 1.5rem 2rem; transform: translateX(100%); visibility: hidden; transition: transform .25s ease, visibility .25s; z-index: 99; overflow-y: auto; }
  body.nav-open .main-nav { transform: translateX(0); visibility: visible; }
  body.nav-open { overflow: hidden; }
  body.nav-open .nav-toggle { position: relative; z-index: 101; }
  .main-nav a, .main-nav .dropdown-toggle { font-size: 1rem; padding: .6rem 0; width: 100%; text-align: left; }
  .nav-cta { text-align: center; margin-top: .75rem; padding: .7rem 1rem; }
  .nav-dropdown { width: 100%; }
  .dropdown-menu { position: static; transform: none; border: none; box-shadow: none; padding: 0 0 0 1rem; min-width: 0; background: transparent; }
  .dropdown-menu a { padding: .5rem 0; }

  .hero { padding: 2.8rem 0 3.2rem; }
  .route-board { transform: none; }
  .section { padding: 3.8rem 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .article-grid { grid-template-columns: 1fr; }
  .pathway-grid { grid-template-columns: 1fr; }
  .pathway-card .card-cta .btn { flex: 1; justify-content: center; }
  .btn-lg { padding: .9rem 1.5rem; font-size: .98rem; }
  .hero-cta { flex-direction: column; align-items: stretch; }
  .hero-cta .btn { width: 100%; justify-content: center; }
  .hero-cta .text-link { justify-content: center; padding: .5rem 0; }
  .testimonial-grid { grid-template-columns: 1fr; }
  .footer-sites { flex-direction: column; }
}

@media (max-width: 480px) {
  .logo { font-size: .92rem; gap: .4rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .audience-grid, .outcome-grid { grid-template-columns: 1fr; }
  .resource-grid { grid-template-columns: 1fr 1fr; }
  .article-tabs { gap: .35rem; }
  .article-tab { padding: .4rem .9rem; font-size: .8rem; }
  .route-row { grid-template-columns: 44px 1fr; }
  .route-row .rr-status { display: none; }
}

/* ============ 無障礙與細節打磨(Phase 2-3) ============ */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 3px; }
.skip-link { position: absolute; left: 1rem; top: -3rem; z-index: 200; background: var(--ink); color: var(--paper); padding: .5rem 1rem; border-radius: 0 0 8px 8px; font-weight: 700; transition: top .15s; }
.skip-link:focus { top: 0; color: var(--paper); }
.section-title, .hero-text h1, .cta-section h2, .course-hero h1, .page-hero h1, .prose h1, .prose h2 { text-wrap: balance; }
.article-card:hover .read-link { color: var(--accent-text); }

/* 資源卡下載標籤 */
.resource-card { color: inherit; display: flex; flex-direction: column; }
.resource-card .dl-tag { margin-top: .8rem; font-family: var(--font-num); font-size: .72rem; font-weight: 700; letter-spacing: .18em; color: var(--accent-text); border: 1.2px solid var(--accent-text); border-radius: 3px; padding: .18rem .6rem; align-self: center; }
.resource-card:hover .dl-tag { background: var(--accent); border-color: var(--accent); color: #fff; }

/* 電子報訂閱表單 */
.subscribe-form { display: flex; flex-wrap: wrap; gap: .75rem; justify-content: center; align-items: stretch; max-width: 620px; margin: 0 auto; }
.subscribe-form input[type=email], .subscribe-form select { font-family: var(--font); font-size: 1rem; padding: .8rem 1rem; border: 2px solid var(--line-strong); border-radius: 10px; background: var(--surface); color: var(--ink); box-shadow: var(--shadow-hard); }
.subscribe-form input[type=email] { flex: 1 1 220px; }
.subscribe-form input[type=email]:focus, .subscribe-form select:focus { outline: 2px solid var(--accent); outline-offset: 2px; }
.subscribe-form .hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.subscribe-msg { margin-top: 1rem; font-weight: 700; }
.subscribe-msg.ok { color: #15803D; }
.subscribe-msg.err { color: var(--accent-text); }
.subscribe-alt { margin-top: 1rem; font-size: .9rem; color: var(--ink-soft); }
@media (max-width: 480px) { .subscribe-form { flex-direction: column; } .subscribe-form .btn { width: 100%; justify-content: center; } }