/* ══════════════════════════════════════════════
   Evolution — 個人商業演化系統
   視覺語言：達文西手稿 × 博物館級展陳。羊皮紙、墨色、
   血赭色（sanguine）粉筆、手繪幾何草圖、克制的捲動動效。
   ══════════════════════════════════════════════ */

:root{
  /* 羊皮紙與墨色階 */
  --parchment: #efe4cc;
  --parchment-card: #f4ecd9;
  --ink: #3a2e20;
  --ink-mid: #6b5a44;
  --ink-faint: #9a8465;
  --ink-line: rgba(58, 46, 32, .25);
  --ink-line-soft: rgba(58, 46, 32, .14);

  /* 血赭色（sanguine）——達文西紅色粉筆 */
  --sanguine: #a5502e;
  --sanguine-dim: #8a4526;
  --sanguine-soft: rgba(165, 80, 46, .12);

  /* Category 配色（低飽和、貼近礦物顏料，10 類） */
  --cat-個人起點: #6b5a44;
  --cat-商業現場: #a5502e;
  --cat-品牌理解: #9c4f5e;
  --cat-系統化: #5b5f8c;
  --cat-自動化: #5f7d5a;
  --cat-ai: #5d7a8c;
  --cat-私域: #7d5a8c;
  --cat-外部認可: #a68a3f;
  --cat-人脈: #7d6a3f;
  --cat-未來: #4f6b6b;

  /* Maturity 等級色（idea → systemized 漸進，墨色到血赭） */
  --mat-idea: #9a8465;
  --mat-tested: #5d7a8c;
  --mat-reusable: #5f7d5a;
  --mat-systemized: #a5502e;

  /* Timeline beam —— 換膚只改這區 */
  --tl-line-color: var(--ink-line);
  --tl-beam-from: var(--sanguine-dim);
  --tl-beam-via: var(--sanguine);
  --tl-year-color: rgba(58, 46, 32, .18);
  --tl-dot-outer: var(--parchment-card);
  --tl-dot-inner: var(--parchment);
  --tl-dot-border: var(--ink-line);

  --radius: 6px;
  --radius-lg: 8px;
  --font-serif: "EB Garamond", "Noto Serif TC", "Songti TC", serif;
  --font-label: "EB Garamond", "Noto Serif TC", serif;

  --maxw: 1080px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }

/* ══ 羊皮紙紋理（inline SVG noise data-URI，禁外部圖片）══ */
body{
  margin: 0;
  background-color: var(--parchment);
  background-image:
    radial-gradient(ellipse 900px 600px at 8% -8%, rgba(58,46,32,.05), transparent 55%),
    radial-gradient(ellipse 700px 500px at 100% 8%, rgba(165,80,46,.04), transparent 55%),
    radial-gradient(ellipse 1000px 700px at 50% 110%, rgba(58,46,32,.06), transparent 60%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='240' height='240'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch' result='t'/%3E%3CfeColorMatrix in='t' type='matrix' values='0 0 0 0 0.227  0 0 0 0 0.180  0 0 0 0 0.125  0 0 0 0.05 0'/%3E%3C/filter%3E%3Crect width='240' height='240' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: no-repeat, no-repeat, no-repeat, repeat;
  background-attachment: fixed, fixed, fixed, fixed;
  color: var(--ink);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

/* 紙張邊緣暗角，固定疊層 */
body::before{
  content: "";
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse 140% 100% at 50% 50%, transparent 55%, rgba(58,46,32,.10) 100%);
  pointer-events: none;
  z-index: 0;
}

.wrap{
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

a{ color: inherit; text-decoration: none; }
h1,h2,h3,h4{ margin: 0; font-weight: 600; letter-spacing: 0; font-family: var(--font-serif); }
p{ margin: 0; }
ul{ margin: 0; padding: 0; list-style: none; }
button{ font-family: inherit; }

/* small-caps 展品標籤感，取代原等寬字體用途 */
.label-caps{
  font-family: var(--font-label);
  font-variant: small-caps;
  letter-spacing: .06em;
}

/* ══ NAV ══ */
#nav{
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(239, 228, 204, .88);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--ink-line-soft);
}
.nav-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.nav-brand{
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 17px;
  font-style: italic;
  color: var(--ink);
}
.nav-brand .mark{
  width: 22px; height: 22px;
  border-radius: 50%;
  border: 1.5px solid var(--sanguine);
  background: transparent;
  display: inline-block;
  position: relative;
}
.nav-brand .mark::after{
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  border: 1px solid var(--ink-line);
}
.navlinks{
  display: flex;
  gap: 26px;
  position: relative;
}
.navlinks a{
  padding: 10px 2px 14px;
  font-family: var(--font-serif);
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--ink-mid);
  transition: color .3s ease;
}
.navlinks a:hover{ color: var(--ink); }
.navlinks a.active{ color: var(--ink); }

/* ══ SECTION ══ */
.sec{ padding: 72px 0; position: relative; z-index: 1; }
.sec-alt{ background: rgba(58,46,32,.03); border-top: 1px solid var(--ink-line-soft); border-bottom: 1px solid var(--ink-line-soft); }
.sec-head{ margin-bottom: 36px; max-width: 640px; }
.sec-eyebrow{
  font-family: var(--font-label);
  font-style: italic;
  font-variant: small-caps;
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--sanguine);
  margin-bottom: 10px;
}
.sec-title{ font-size: 27px; margin-bottom: 8px; }
.sec-lead{ color: var(--ink-mid); font-size: 15px; }

/* ══ HERO ══ */
.hero{ padding: 96px 0 64px; position: relative; overflow: hidden; }
.hero-eyebrow{
  font-family: var(--font-label);
  font-style: italic;
  font-variant: small-caps;
  font-size: 14px;
  letter-spacing: .1em;
  color: var(--sanguine);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 20px;
}
.hero-eyebrow .dot{
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--sanguine);
}
.hero h1{
  font-size: clamp(28px, 4.2vw, 44px);
  line-height: 1.42;
  max-width: 780px;
  color: var(--ink);
  font-weight: 500;
}
.hero .sub{
  margin-top: 18px;
  font-size: 17px;
  font-style: italic;
  color: var(--ink-mid);
  max-width: 620px;
}

/* 維特魯威式手稿草圖，hero 右側背景裝飾 */
.hero-sketch{
  position: absolute;
  right: -60px;
  top: 40px;
  width: 480px;
  height: 480px;
  opacity: .08;
  pointer-events: none;
  z-index: 0;
  will-change: transform;
}
.hero .wrap{ position: relative; z-index: 1; }

/* ══ 入口卡 ══ */
.entry-grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 40px;
}
.entry-card{
  display: block;
  padding: 28px;
  background: var(--parchment-card);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-lg);
  box-shadow: 0 2px 10px rgba(58,46,32,.06);
  transition: border-color .15s, transform .15s, box-shadow .15s;
}
.entry-card:hover{
  border-color: var(--sanguine-dim);
  box-shadow: 0 4px 16px rgba(58,46,32,.10);
  transform: translateY(-2px);
}
.entry-card .entry-tag{
  font-family: var(--font-label);
  font-variant: small-caps;
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--sanguine);
  margin-bottom: 10px;
}
.entry-card h3{ font-size: 21px; margin-bottom: 8px; }
.entry-card p{ font-size: 14px; color: var(--ink-mid); }
.entry-card .arrow{
  margin-top: 16px;
  font-style: italic;
  font-size: 14px;
  color: var(--ink-faint);
}

/* ══ 里程碑卡片（首頁最近里程碑 / timeline 共用元素）══ */
.cat-tag{
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-label);
  font-variant: small-caps;
  font-size: 13px;
  letter-spacing: .04em;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--parchment-card);
  border: 1px solid var(--ink-line);
}
.cat-tag::before{
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--cat-dot, var(--sanguine));
}

.milestone-grid{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 40px;
}
.mile-card{
  display: block;
  padding: 20px;
  background: var(--parchment-card);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius);
  box-shadow: 0 1px 6px rgba(58,46,32,.05);
  transition: border-color .15s, box-shadow .15s;
}
.mile-card:hover{ border-color: var(--sanguine-dim); box-shadow: 0 3px 12px rgba(58,46,32,.09); }
.mile-card .mile-date{
  font-family: var(--font-label);
  font-style: italic;
  font-size: 13px;
  color: var(--ink-faint);
  margin-bottom: 10px;
}
.mile-card h4{ font-size: 15px; margin: 10px 0 6px; line-height: 1.5; font-weight: 600; }
.mile-card p{ font-size: 13px; color: var(--ink-mid); }

/* ══ About / 敘事區塊 ══ */
.prose{ max-width: 680px; color: var(--ink-mid); font-size: 16px; }
.prose p + p{ margin-top: 14px; }
.prose strong{ color: var(--ink); font-weight: 600; }

/* ══ TIMELINE 頁 ══ */
.filter-bar{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 40px;
}
.chip{
  font-family: var(--font-label);
  font-variant: small-caps;
  font-size: 13px;
  letter-spacing: .04em;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--parchment-card);
  border: 1px solid var(--ink-line);
  color: var(--ink-mid);
  cursor: pointer;
  transition: all .15s;
}
.chip:hover{ border-color: var(--sanguine-dim); color: var(--ink); }
.chip.active{
  background: var(--sanguine-soft);
  border-color: var(--sanguine-dim);
  color: var(--sanguine);
}

/* ══ ARSENAL — 篩選 chips 滑動高亮（僅 .filter-bar--sliding，不影響 Timeline chips）══ */
.filter-bar--sliding{
  position: relative;
}
.filter-bar--sliding .chip-slider{
  position: absolute;
  z-index: 0;
  background: var(--sanguine);
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
  transition:
    left .28s cubic-bezier(.4,0,.2,1),
    top .28s cubic-bezier(.4,0,.2,1),
    width .28s cubic-bezier(.4,0,.2,1),
    height .28s cubic-bezier(.4,0,.2,1),
    opacity .2s ease;
}
.filter-bar--sliding .chip-slider.positioned{
  opacity: 1;
}
.filter-bar--sliding .chip{
  position: relative;
  z-index: 1;
  font-size: 14px;
  padding: 8px 16px;
  transition: color .2s ease .06s, border-color .15s, background .15s;
}
.filter-bar--sliding .chip:hover{
  border-color: var(--sanguine-dim);
  color: var(--ink);
}
.filter-bar--sliding .chip.active{
  background: transparent;
  border-color: transparent;
  color: var(--parchment-card);
}
@media (prefers-reduced-motion: reduce){
  .filter-bar--sliding .chip-slider{ transition: none; }
  .filter-bar--sliding .chip{ transition: none; }
}

/* ══ TIMELINE — 年份分組 ══ */
.tl{
  position: relative;
  padding-top: 8px;
}

/* 左側貫穿全高的軌道線 + 捲動光束 */
.tl-track{
  position: absolute;
  left: 22px;
  top: 0;
  bottom: 0;
  width: 1.5px;
  background: var(--tl-line-color);
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 10%, black 90%, transparent 100%);
  mask-image: linear-gradient(to bottom, transparent 0%, black 10%, black 90%, transparent 100%);
  pointer-events: none;
}
/* 墨水暈染光束：sepia 深褐到血赭漸層，頂端加暈開感 */
.tl-beam{
  position: absolute;
  left: -2.5px;
  top: 0;
  width: 6.5px;
  height: 0;
  border-radius: 999px;
  background: linear-gradient(to top, var(--tl-beam-from) 0%, var(--tl-beam-via) 55%, rgba(165,80,46,.35) 85%, transparent 100%);
  box-shadow: 0 0 14px 3px rgba(165,80,46,.25);
  opacity: 0;
  transition: opacity .2s linear;
  will-change: height, opacity;
}
.tl-beam::after{
  content: "";
  position: absolute;
  top: -6px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(165,80,46,.55) 0%, transparent 70%);
  filter: blur(2px);
}

.tl-year{
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding-top: 7rem;
}
.tl-year:first-child{ padding-top: 8px; }
.tl-year.tl-year-hidden{ display: none; }

.tl-year-sticky{
  position: sticky;
  top: 120px;
  align-self: flex-start;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-shrink: 0;
  z-index: 2;
}
.tl-year-label-group{
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.tl-chapter-label{
  font-family: var(--font-label);
  font-style: italic;
  font-variant: small-caps;
  font-size: 14px;
  letter-spacing: .04em;
  color: var(--ink-faint);
  white-space: nowrap;
}
/* 手繪雙圈節點 */
.tl-year-dot-outer{
  position: relative;
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--tl-dot-outer);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.tl-year-dot-outer::before{
  content: "";
  position: absolute;
  inset: 1px;
  border-radius: 50%;
  border: 1.3px solid var(--ink-line);
  -webkit-mask-image: repeating-conic-gradient(#000 0deg 8deg, transparent 8deg 11deg);
  mask-image: repeating-conic-gradient(#000 0deg 8deg, transparent 8deg 11deg);
}
.tl-year-dot-inner{
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--tl-dot-inner);
  border: 2px solid var(--tl-dot-border);
}
.tl-year-label{
  font-size: 4rem;
  font-weight: 500;
  font-style: italic;
  letter-spacing: 0;
  color: var(--tl-year-color);
  line-height: 1;
}

.tl-year-body{
  position: relative;
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  padding-left: 4px;
}

.tl-year-label-mobile{ display: none; }
.tl-chapter-label-mobile{
  display: block;
  font-family: var(--font-label);
  font-style: italic;
  font-variant: small-caps;
  font-size: 14px;
  color: var(--ink-faint);
  margin-top: 4px;
}

.tl-node{ position: relative; }
.tl-node.tl-node-hidden{ display: none; }

/* 邊註：手稿頁邊的手寫小字，僅寬螢幕顯示，不佔文件流 */
.tl-margin-note{
  display: none;
}

/* Scroll-in 進場動效初始態 */
.tl-node-inner{
  position: relative;
  background: var(--parchment-card);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius);
  padding: 18px 20px;
  cursor: pointer;
  box-shadow: 0 1px 6px rgba(58,46,32,.05);
  transition: border-color .15s, box-shadow .15s, opacity .6s ease, transform .6s ease;
}
.tl-node-inner:hover{ border-color: var(--sanguine-dim); box-shadow: 0 3px 12px rgba(58,46,32,.09); }

/* 里程碑手繪草圖：卡片右側低透明度裝飾，不擋文字 */
.card-sketch{
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  max-width: 180px;
  max-height: 120px;
  width: auto;
  height: auto;
  opacity: .55;
  mix-blend-mode: multiply;
  pointer-events: none;
  z-index: 0;
}

.tl-head{
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 10px;
  position: relative;
  z-index: 1;
}
.tl-date{ font-family: var(--font-label); font-style: italic; font-size: 13px; color: var(--ink-faint); }
.tl-node h3{ font-size: 17px; margin: 4px 0 6px; font-weight: 600; position: relative; z-index: 1; max-width: calc(100% - 190px); }
.tl-summary{ font-size: 14px; color: var(--ink-mid); position: relative; z-index: 1; max-width: calc(100% - 190px); }
.tl-toggle{
  margin-left: auto;
  font-family: var(--font-label);
  font-variant: small-caps;
  font-size: 13px;
  color: var(--ink-faint);
}

.tl-detail{
  display: none;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--ink-line-soft);
  position: relative;
  z-index: 1;
}
.tl-node.open .tl-detail{ display: block; }
.tl-node.open .tl-toggle::before{ content: "收合 ▲"; }
.tl-node:not(.open) .tl-toggle::before{ content: "展開 ▼"; }

.detail-block{ margin-bottom: 16px; }
.detail-block:last-child{ margin-bottom: 0; }
.detail-label{
  font-family: var(--font-label);
  font-variant: small-caps;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--sanguine);
  margin-bottom: 8px;
}
.chain{
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.chain-step{
  display: flex;
  gap: 10px;
  font-size: 14px;
  color: var(--ink-mid);
  line-height: 1.6;
}
/* 手繪風箭頭：淡墨色細線字符 */
.chain-step .chain-arrow{
  color: var(--sanguine-dim);
  font-family: var(--font-serif);
  font-style: italic;
  flex-shrink: 0;
}
.detail-text{ font-size: 14px; color: var(--ink-mid); line-height: 1.7; }
.skill-links, .ext-links{
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.skill-pill{
  font-family: var(--font-label);
  font-variant: small-caps;
  font-size: 13px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--sanguine-soft);
  border: 1px solid var(--sanguine-dim);
  color: var(--sanguine);
  transition: opacity .15s;
}
.skill-pill:hover{ opacity: .8; }
.ext-link{
  font-family: var(--font-label);
  font-variant: small-caps;
  font-size: 13px;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--parchment);
  border: 1px solid var(--ink-line);
  color: var(--ink-mid);
}

/* ══ ARSENAL 頁 ══ */
.filter-group{ margin-bottom: 16px; }
.filter-group-label{
  font-family: var(--font-label);
  font-variant: small-caps;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--ink-faint);
  margin-bottom: 8px;
}

.skill-grid{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  align-items: start;
  gap: 18px;
  margin-top: 32px;
}
.skill-card{
  background: var(--parchment-card);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-lg);
  padding: 22px;
  cursor: pointer;
  box-shadow: 0 1px 6px rgba(58,46,32,.05);
  transition: border-color .15s, box-shadow .15s, opacity .6s ease, transform .6s ease;
}
.skill-card:hover{ border-color: var(--sanguine-dim); box-shadow: 0 3px 12px rgba(58,46,32,.09); }
.skill-card-head{
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}
.type-tag{
  font-family: var(--font-label);
  font-variant: small-caps;
  font-size: 13px;
  color: var(--ink-mid);
  background: var(--parchment);
  border: 1px solid var(--ink-line);
  padding: 3px 9px;
  border-radius: 6px;
}
.maturity-badge{
  font-family: var(--font-label);
  font-variant: small-caps;
  font-size: 13px;
  letter-spacing: .04em;
  padding: 3px 10px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid;
}
.maturity-badge::before{ content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.maturity-idea{ color: var(--mat-idea); border-color: var(--mat-idea); }
.maturity-tested{ color: var(--mat-tested); border-color: var(--mat-tested); }
.maturity-reusable{ color: var(--mat-reusable); border-color: var(--mat-reusable); }
.maturity-systemized{ color: var(--mat-systemized); border-color: var(--mat-systemized); }

/* cost badge：與 maturity-badge 同視覺語言 */
.cost-badge{
  font-family: var(--font-label);
  font-variant: small-caps;
  font-size: 13px;
  letter-spacing: .04em;
  padding: 3px 10px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  border: 1px solid;
}
.cost-badge::before{ content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.cost-free{ color: var(--mat-reusable); border-color: var(--mat-reusable); }
.cost-subscription{ color: var(--mat-tested); border-color: var(--mat-tested); }
.cost-api{ color: var(--sanguine); border-color: var(--sanguine); }

.skill-card-head-badges{
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

/* 「怎麼呼叫」等寬 code 標籤 */
.invocation-chip{
  display: inline-block;
  font-family: "SFMono-Regular", "Menlo", "Consolas", monospace;
  font-size: 13px;
  background: var(--sanguine-soft);
  color: var(--ink);
  border-radius: var(--radius);
  padding: 6px 10px;
  line-height: 1.6;
}

.skill-card h3{ font-size: 17px; margin-bottom: 10px; line-height: 1.4; font-weight: 600; }
.skill-card .problem{ font-size: 14px; color: var(--ink-mid); }
.skill-card-toggle{
  margin-top: 14px;
  font-family: var(--font-label);
  font-variant: small-caps;
  font-size: 13px;
  color: var(--ink-faint);
}
.skill-card.open .skill-card-toggle::before{ content: "收合 ▲"; }
.skill-card:not(.open) .skill-card-toggle::before{ content: "展開 ▼"; }

.skill-detail{
  display: none;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--ink-line-soft);
}
.skill-card.open .skill-detail{ display: block; }

.success-block{
  background: var(--sanguine-soft);
  border: 1px solid var(--sanguine-dim);
  border-radius: var(--radius);
  padding: 14px 16px;
  margin-bottom: 16px;
}
.success-block .detail-label{ color: var(--sanguine); }
.success-block .detail-text{ color: var(--ink); }

.meta-row{
  display: flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  font-size: 13px;
  color: var(--ink-faint);
  font-family: var(--font-label);
  font-variant: small-caps;
  margin-top: 14px;
}

/* ══ TIMELINE — CODA（結尾核心句）══ */
.tl-coda{
  text-align: center;
  max-width: 640px;
  margin: 8rem auto 8rem;
  padding: 0 24px;
}
.coda-kicker{
  font-family: var(--font-label);
  font-variant: small-caps;
  font-style: italic;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--sanguine);
  margin-bottom: 20px;
}
.coda-statement{
  font-size: clamp(20px, 2.6vw, 27px);
  line-height: 1.6;
  color: var(--ink);
  font-weight: 500;
  margin-bottom: 32px;
}
.coda-lines{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px;
  font-family: var(--font-label);
  font-style: italic;
  font-size: 14px;
  color: var(--ink-faint);
}
.coda-line{ white-space: nowrap; }
.coda-line:not(:last-child)::after{
  content: "・";
  margin-left: 14px;
  color: var(--ink-faint);
}

/* ══ FOOTER ══ */
.footer{
  padding: 32px 0;
  border-top: 1px solid var(--ink-line-soft);
  text-align: center;
}
.footer p{
  font-family: var(--font-label);
  font-size: 13px;
  color: var(--ink-faint);
}
.footer .motto{
  font-style: italic;
  margin-bottom: 6px;
  letter-spacing: .02em;
}

/* ══ 空狀態 ══ */
.empty-state{
  padding: 40px;
  text-align: center;
  color: var(--ink-faint);
  font-size: 14px;
  font-style: italic;
  border: 1px dashed var(--ink-line);
  border-radius: var(--radius);
}

/* ══ Scroll-driven 進場動效（一次性，IntersectionObserver 控制）══ */
.reveal{
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .6s ease, transform .6s ease;
}
.reveal.revealed{
  opacity: 1;
  transform: translateY(0);
}

/* ══ RESPONSIVE ══ */
@media (min-width: 861px){
  .tl-year-label-mobile{ display: none !important; }
}
/* 邊註只在寬螢幕顯示，貼在該章第一個節點附近的右側留白 */
@media (min-width: 1440px){
  .tl-margin-note{
    display: block;
    position: absolute;
    left: calc(100% + 32px);
    top: 8px;
    width: 180px;
    padding-left: 16px;
    border-left: 1px solid var(--ink-line-soft);
    font-family: var(--font-label);
    font-style: italic;
    font-size: 13px;
    line-height: 1.7;
    color: var(--ink-faint);
  }
}
@media (max-width: 860px){
  .milestone-grid{ grid-template-columns: 1fr; }
  .entry-grid{ grid-template-columns: 1fr; }
  .skill-grid{ grid-template-columns: 1fr; }
  .hero-sketch{ display: none; }

  .tl-track{ left: 14px; }
  .tl-year{ gap: 14px; padding-top: 40px; }
  .tl-year-sticky{
    position: static;
    gap: 12px;
  }
  .tl-year-dot-outer{ width: 28px; height: 28px; }
  .tl-year-dot-inner{ width: 10px; height: 10px; }
  .tl-year-label-group{ display: none; }
  .tl-year-label-mobile{
    display: block;
    font-size: 1.9rem;
    font-weight: 500;
    font-style: italic;
    color: var(--tl-year-color);
    margin-bottom: 12px;
  }
  .tl-year-body{ padding-left: 0; }
  .card-sketch{ display: none; }
  .tl-node h3, .tl-summary{ max-width: 100%; }
  .tl-coda{ margin: 5rem auto 5rem; }
  .coda-lines{ flex-direction: column; gap: 8px; }
  .coda-line:not(:last-child)::after{ display: none; }
}
@media (prefers-reduced-motion: reduce){
  .tl-beam{ transition: none; }
  .reveal{ opacity: 1; transform: none; transition: none; }
  .hero-sketch{ transform: none !important; }
}
@media (max-width: 640px){
  .navlinks{ gap: 14px; }
  .navlinks a{ padding: 10px 2px 14px; font-size: 14px; }
  .nav-brand .brand-en{ display: none; }
  .sec{ padding: 48px 0; }
  .hero{ padding: 56px 0 40px; }
  .wrap{ padding: 0 18px; }
}

/* Coda 落款 */
.coda-colophon{
  margin: 2.2rem 0 0;
  font-size: 1.05rem;
  color: var(--ink-mid);
  letter-spacing: .04em;
}
.coda-colophon + .coda-colophon{ margin-top: .4rem; }
.coda-colophon--accent{ color: var(--sanguine); }

/* 卡片內「延伸 ⤳」連結 */
.feed-links a{
  color: var(--sanguine-dim);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.feed-links a:hover{ color: var(--sanguine); }

/* ══ NAV — Shifting Dropdown（移植自 React/Framer Motion，改暖米配色）══ */
.nav-tab{
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  cursor: pointer;
}
.tab-numeral{
  font-family: var(--font-label);
  font-style: italic;
  font-size: 13px;
  letter-spacing: .02em;
  color: var(--ink-faint);
  transition: color .3s ease;
}
.nav-tab:hover .tab-numeral,
.nav-tab.active .tab-numeral,
.nav-tab.tab-open .tab-numeral{ color: var(--sanguine); }
.nav-tab.tab-open{ color: var(--ink); }
.nav-caret{
  width: 5px; height: 5px;
  margin-left: 5px;
  border-right: 1px solid var(--ink-faint);
  border-bottom: 1px solid var(--ink-faint);
  transform: translateY(-2px) rotate(45deg);
  transition: transform .3s ease, border-color .3s ease;
}
.nav-tab:hover .nav-caret,
.nav-tab.tab-open .nav-caret{ border-color: var(--sanguine); }
.nav-tab.tab-open .nav-caret{ transform: translateY(0) rotate(-135deg); }

.shift-drop{
  position: absolute;
  top: 100%;
  right: 0;
  z-index: 60;
  padding-top: 11px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity .3s ease, transform .3s ease, visibility 0s .3s;
  will-change: transform, opacity;
}
.shift-drop.open{
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity .3s ease, transform .3s ease, visibility 0s;
}
.shift-nub{
  position: absolute;
  top: 5px;
  left: 60px;
  width: 14px; height: 14px;
  background: var(--parchment-card);
  border-left: 1px solid var(--ink-line);
  border-top: 1px solid var(--ink-line);
  border-radius: 3px 0 0 0;
  transform: translateX(-50%) rotate(45deg);
  transition: left .25s cubic-bezier(.4,0,.2,1);
  z-index: 1;
}
.shift-drop-card{
  position: relative;
  width: min(460px, calc(100vw - 32px));
  background: var(--parchment-card);
  border: 1px solid var(--ink-line);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 44px -22px rgba(58,46,32,.5), 0 3px 10px rgba(58,46,32,.08);
  overflow: hidden;
  height: 0;
  transition: height .34s cubic-bezier(.25,.8,.3,1);
}
.shift-drop-card::after{
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  mix-blend-mode: multiply;
  opacity: .5;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='120'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2'/><feColorMatrix values='0 0 0 0 .23 0 0 0 0 .18 0 0 0 0 .13 0 0 0 .06 0'/></filter><rect width='120' height='120' filter='url(%23n)'/></svg>");
}
.shift-pane{
  padding: 16px 16px 14px;
  transition: transform .32s ease, opacity .32s ease;
}
.drop-head{
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding: 0 4px 10px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--ink-line-soft);
}
.drop-eyebrow{
  font-family: var(--font-label);
  font-variant: small-caps;
  letter-spacing: .08em;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}
.drop-sub{ font-size: 12px; color: var(--ink-faint); letter-spacing: .03em; }
.drop-chapters{ display: grid; grid-template-columns: 1fr 1fr; gap: 2px 10px; }
.drop-chapter{
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 8px;
  padding: 7px 8px;
  border-radius: var(--radius);
  transition: background .15s;
}
.drop-chapter:hover{ background: var(--parchment); }
.drop-ch-num{ font-family: var(--font-label); font-variant: small-caps; font-size: 12px; color: var(--sanguine); letter-spacing: .04em; }
.drop-ch-title{ font-size: 13.5px; color: var(--ink); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.drop-ch-era{ font-size: 11px; color: var(--ink-faint); font-variant: small-caps; }
.drop-skills{ display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.drop-skill{
  display: block;
  padding: 9px 10px;
  border: 1px solid var(--ink-line-soft);
  border-radius: var(--radius);
  transition: background .15s, border-color .15s;
}
.drop-skill:hover{ background: var(--parchment); border-color: var(--ink-line); }
.drop-sk-top{ display: flex; align-items: center; justify-content: space-between; gap: 6px; margin-bottom: 4px; }
.drop-sk-type{ font-family: var(--font-label); font-variant: small-caps; font-size: 10.5px; letter-spacing: .05em; color: var(--ink-mid); }
.drop-sk-mat{ font-size: 9.5px; font-variant: small-caps; letter-spacing: .04em; padding: 1px 6px; border-radius: 999px; color: #fff; white-space: nowrap; }
.drop-sk-mat.m-idea{ background: var(--mat-idea); }
.drop-sk-mat.m-tested{ background: var(--mat-tested); }
.drop-sk-mat.m-reusable{ background: var(--mat-reusable); }
.drop-sk-mat.m-systemized{ background: var(--mat-systemized); }
.drop-sk-name{ font-size: 12.5px; line-height: 1.4; color: var(--ink); }
.drop-more{
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin: 12px 4px 0;
  font-family: var(--font-label);
  font-variant: small-caps;
  letter-spacing: .05em;
  font-size: 12.5px;
  color: var(--sanguine);
  transition: gap .15s;
}
.drop-more:hover{ gap: 8px; }
@media (max-width: 640px){
  .shift-drop-card{ width: min(340px, calc(100vw - 28px)); }
  .drop-chapters, .drop-skills{ grid-template-columns: 1fr; }
  .drop-ch-title{ white-space: normal; }
}
@media (prefers-reduced-motion: reduce){
  .shift-drop, .shift-drop.open, .shift-nub, .shift-drop-card, .shift-pane, .nav-caret, .nav-ink{ transition: none !important; }
}

/* ══ 方法論 stepper（首頁；內容整合自舊 portfolio）══ */
.method-steps{
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}
.method-step{
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 18px;
  padding: 20px 2px;
  border-top: 1px solid var(--ink-line-soft);
}
.method-step:first-child{ border-top: none; }
.ms-no{
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 600;
  font-style: italic;
  line-height: 1;
  color: var(--sanguine);
  opacity: .85;
}
.ms-name{
  font-size: 18px;
  color: var(--ink);
  margin-bottom: 5px;
}
.ms-desc{
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-mid);
}
@media (max-width: 640px){
  .method-step{ grid-template-columns: 42px 1fr; gap: 12px; padding: 16px 2px; }
  .ms-no{ font-size: 24px; }
}

/* 手繪墨水底線 */
.nav-ink{
  position: absolute;
  bottom: 3px;
  left: 0;
  height: 8px;
  width: 64px;
  pointer-events: none;
  opacity: 0;
  transition: transform .5s cubic-bezier(.22,.85,.3,1), width .5s cubic-bezier(.22,.85,.3,1), opacity .35s ease;
}
.nav-ink.show{ opacity: 1; }
.nav-ink svg{ display: block; width: 100%; height: 100%; overflow: visible; }
.nav-ink path{ fill: none; stroke: var(--sanguine); stroke-linecap: round; vector-effect: non-scaling-stroke; }
.nav-ink .ink-halo{ stroke-width: 3.4; opacity: .16; }
.nav-ink .ink-core{ stroke-width: 1.5; opacity: .85; stroke-dasharray: 68 3 14 2; }