/* ── Tokens ──────────────────────────────────────────────
   青花瓷：釉白的底，鈷藍的筆。淺色單一主題。
   深色模式之後要補的話，在這裡加一組 token 覆寫即可。 */
:root {
  --paper:       #F7F9FA;
  --paper-sunk:  #EAF0F3;
  --ink:         #14181F;
  --ink-soft:    #3F4A56;
  --muted:       #76838F;
  --rule:        #D8E1E7;
  --accent:      #23548A;
  --accent-tint: #DEE9F2;

  /* 色塊：淺青的帶狀底，與整頁最重的一塊鈷藍 */
  --wash:        #E7EFF5;
  --deep:        #1C4A7E;
  --deep-ink:    #EDF3F8;
  --deep-soft:   #C8DBEC;
  --deep-muted:  #9FBBD6;
  --deep-accent: #9CC0E4;

  /* 拉丁字型排在漢字字型前面。順序反過來的話，引號、撇號這些兩邊都有的
     字符會被漢字字型接走，變成全形寬度，中間裂一個洞。 */
  --serif: "Iowan Old Style", "Palatino Linotype", Georgia, "Liberation Serif", "Times New Roman", "Songti TC", "Noto Serif CJK TC", "Noto Serif TC", "PMingLiU", serif;
  --sans:  -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Liberation Sans", "PingFang TC", "Noto Sans CJK TC", "Microsoft JhengHei", sans-serif;

  --measure: 34rem;
  --gutter:  clamp(1.5rem, 6vw, 5rem);
}

/* ── 語言切換 ─────────────────────────────────────────── */
html[data-lang="zh"] .en { display: none; }
html[data-lang="en"] .zh { display: none; }

/* ── Base ────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.85;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
}

html[data-lang="en"] body { line-height: 1.7; letter-spacing: 0; }

a { color: inherit; }

h1, h2, h3 { font-weight: 500; margin: 0; }

/* ── Topbar ──────────────────────────────────────────── */
.topbar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.75rem var(--gutter) 0;
}

.wordmark {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
  text-decoration: none;
}

.wordmark-zh {
  font-family: var(--serif);
  font-size: 1.35rem;
  letter-spacing: 0.12em;
}

.wordmark-en {
  font-size: 0.72rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
}

.lang-toggle {
  border: 1px solid var(--rule);
  background: transparent;
  color: var(--ink-soft);
  border-radius: 999px;
  padding: 0.3rem 0.85rem;
  font: inherit;
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s;
}

.lang-toggle:hover { border-color: var(--accent); color: var(--accent); }
.lang-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ── Hero ────────────────────────────────────────────── */
.hero {
  padding: clamp(4rem, 14vh, 9rem) var(--gutter) clamp(3.5rem, 10vh, 6rem);
  max-width: 60rem;
}

.eyebrow {
  margin: 0 0 1.75rem;
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--muted);
}

.mission {
  font-family: var(--serif);
  font-size: clamp(1.6rem, 3.9vw, 2.6rem);
  line-height: 1.55;
  letter-spacing: 0.015em;
  text-wrap: balance;
}

html[data-lang="en"] .mission { line-height: 1.35; letter-spacing: -0.01em; }

/* ── Sections ────────────────────────────────────────── */
.section {
  padding: clamp(3rem, 8vh, 5rem) var(--gutter);
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 12rem minmax(0, var(--measure));
  gap: 0 clamp(1.5rem, 5vw, 4rem);
  align-items: start;
}

.section-body { min-width: 0; }

html[data-lang="en"] .section-title { letter-spacing: 0.13em; }

.section-title {
  font-family: var(--serif);
  font-size: 0.95rem;
  letter-spacing: 0.2em;
  color: var(--accent);
  line-height: 2.2;
}

@media (max-width: 46rem) {
  .section { grid-template-columns: minmax(0, 1fr); gap: 0; }
  .section-body { min-width: 0; }

html[data-lang="en"] .section-title { letter-spacing: 0.13em; }

.section-title { margin-bottom: 1.75rem; }
}

/* ── 區塊底色 ─────────────────────────────────────────
   白 → 淺青 → 白 → 淺青 → 白 → 鈷藍收尾。
   深色區塊直接改寫 token，裡面的元件不必各自處理。 */
.section--wash { background: var(--wash); border-top-color: #D2DFE9; }

/* 鈷藍那一整塊由 .deepblock 統一鋪底，裡面的區塊本身透明，
   窗花才能一路連過去，不會在區塊交界處錯開 */
.deepblock,
.footer--deep { background: var(--deep); }

.section--deep,
.footer--deep {
  color: var(--deep-ink);
  --ink:         var(--deep-ink);
  --ink-soft:    var(--deep-soft);
  --muted:       var(--deep-muted);
  --accent:      var(--deep-accent);
  --accent-tint: rgba(255, 255, 255, 0.28);
  --rule:        rgba(255, 255, 255, 0.16);
  --paper-sunk:  rgba(255, 255, 255, 0.10);
}

/* 鈷藍區塊之間不再需要分隔線，交界處自己就是斷點 */
.section--deep + .section--deep { border-top-color: transparent; }
.section--deep:first-child { border-top: 0; }

/* ── 三問 ────────────────────────────────────────────── */
.qa { display: grid; gap: 2.5rem; }

.qa-item { position: relative; padding-left: 1.25rem; }

.qa-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 0.4rem;
  height: 1px;
  background: var(--accent);
}

.q {
  margin: 0 0 0.4rem;
  font-size: 1.02rem;
  color: var(--ink);
}

.a {
  margin: 0;
  color: var(--ink-soft);
}

/* ── 短文 ─────────────────────────────────────────────── */
.essay p {
  margin: 0 0 1.15rem;
  color: var(--ink-soft);
}

.essay p:last-child { margin-bottom: 0; }

.essay .lead {
  font-size: 1.08rem;
  color: var(--ink);
}

/* ── 不做什麼 ─────────────────────────────────────────── */
.nots {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.9rem;
}

.nots li { position: relative; padding-left: 1.6rem; }

.nots li::before {
  content: "\00d7";
  position: absolute;
  left: 0;
  top: 0;
  line-height: inherit;
  color: var(--accent);
  font-size: 0.95rem;
}

.not-title {
  margin: 0 0 0.3rem;
  color: var(--ink);
  letter-spacing: 0.03em;
}

.not-body {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

/* ── 引文 ────────────────────────────────────────────── */
.quote {
  margin: 0 0 2rem;
  padding: 0 0 0 1.5rem;
  border-left: 2px solid var(--accent-tint);
}

.quote p {
  margin: 0;
  font-family: var(--serif);
  font-size: 1.3rem;
  line-height: 1.7;
  letter-spacing: 0.06em;
}

.quote cite {
  display: block;
  margin-top: 0.75rem;
  font-style: normal;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.prose { color: var(--ink-soft); }
.prose p { margin: 0 0 1.1rem; }
.prose p:last-child { margin-bottom: 0; }

/* ── 專案 ────────────────────────────────────────────── */
.projects {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2.75rem;
}

.project-head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.5rem 0.9rem;
  margin-bottom: 0.55rem;
}

.project-head h3 {
  font-family: var(--serif);
  font-size: 1.2rem;
  letter-spacing: 0.04em;
}

.status {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 0.16rem 0.6rem;
  border-radius: 999px;
  white-space: nowrap;
}

.status--beta    { background: var(--accent-tint); color: var(--accent); }
.status--concept { background: var(--paper-sunk); color: var(--muted); }

.project-tag {
  margin: 0 0 0.7rem;
  color: var(--muted);
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}

.project-body { margin: 0 0 0.9rem; color: var(--ink-soft); }
.project-body:last-child { margin-bottom: 0; }

.project-link { margin: 0; font-size: 0.92rem; letter-spacing: 0.04em; }

.project-link a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid var(--accent-tint);
  padding-bottom: 0.12em;
  transition: border-color 0.15s;
}

.project-link a:hover { border-color: var(--accent); }

/* ── 聯絡 ────────────────────────────────────────────── */
.email {
  margin: 1.1rem 0 0;
  font-family: var(--serif);
  font-size: 1.3rem;
  letter-spacing: 0.02em;
}

.email a {
  text-decoration: none;
  border-bottom: 1px solid var(--accent-tint);
  padding-bottom: 0.15em;
  transition: border-color 0.15s, color 0.15s;
}

.email a:hover { color: var(--accent); border-color: var(--accent); }

/* ── Footer ──────────────────────────────────────────── */
.footer {
  padding: 2.5rem var(--gutter) 3.5rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
}

.footer p { margin: 0; }

/* ── 窗花 ─────────────────────────────────────────────
   老屋鐵窗花：方格為骨，對角線交會處綴一朵菱形捲草，
   四片橄欖形葉子從中心朝四角散開。
   兩張內嵌的 SVG，不對外請求。一格就是一個完整單元，
   角上的花只畫四分之一、平鋪時四塊自己拼回一朵。 */
.latticed { position: relative; isolation: isolate; }
.latticed > * { position: relative; z-index: 1; }

.latticed::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100'><g fill='none' stroke='%232B5F94' stroke-linecap='round' stroke-linejoin='round'><path stroke-width='2.1' d='M0 0 H100 M0 0 V100 M0 0 L100 100 M100 0 L0 100'/><path stroke-width='1.8' d='M50.0 50.0 Q41.3 8.7 0.0 0.0 M50.0 50.0 Q8.7 41.3 0.0 0.0 M50.0 50.0 Q91.3 41.3 100.0 0.0 M50.0 50.0 Q58.7 8.7 100.0 0.0 M50.0 50.0 Q8.7 58.7 0.0 100.0 M50.0 50.0 Q41.3 91.3 0.0 100.0 M50.0 50.0 Q58.7 91.3 100.0 100.0 M50.0 50.0 Q91.3 58.7 100.0 100.0'/><path stroke-width='1.4' d='M50.0 41.5 L58.5 50.0 L50.0 58.5 L41.5 50.0 Z M54.3 54.3 c2.9 2.9 6.5 2.6 6.9 -0.5 c0.3 -2.1 -2.8 -3.0 -3.4 -1.0 M45.7 54.3 c-2.9 2.9 -6.5 2.6 -6.9 -0.5 c-0.3 -2.1 2.8 -3.0 3.4 -1.0 M54.3 45.7 c2.9 -2.9 6.5 -2.6 6.9 0.5 c0.3 2.1 -2.8 3.0 -3.4 1.0 M45.7 45.7 c-2.9 -2.9 -6.5 -2.6 -6.9 0.5 c-0.3 2.1 2.8 3.0 3.4 1.0 M0.0 -8.5 L8.5 0.0 L0.0 8.5 L-8.5 0.0 Z M4.3 4.3 c2.9 2.9 6.5 2.6 6.9 -0.5 c0.3 -2.1 -2.8 -3.0 -3.4 -1.0 M-4.3 4.3 c-2.9 2.9 -6.5 2.6 -6.9 -0.5 c-0.3 -2.1 2.8 -3.0 3.4 -1.0 M4.3 -4.3 c2.9 -2.9 6.5 -2.6 6.9 0.5 c0.3 2.1 -2.8 3.0 -3.4 1.0 M-4.3 -4.3 c-2.9 -2.9 -6.5 -2.6 -6.9 0.5 c-0.3 2.1 2.8 3.0 3.4 1.0 M100.0 -8.5 L108.5 0.0 L100.0 8.5 L91.5 0.0 Z M104.3 4.3 c2.9 2.9 6.5 2.6 6.9 -0.5 c0.3 -2.1 -2.8 -3.0 -3.4 -1.0 M95.7 4.3 c-2.9 2.9 -6.5 2.6 -6.9 -0.5 c-0.3 -2.1 2.8 -3.0 3.4 -1.0 M104.3 -4.3 c2.9 -2.9 6.5 -2.6 6.9 0.5 c0.3 2.1 -2.8 3.0 -3.4 1.0 M95.7 -4.3 c-2.9 -2.9 -6.5 -2.6 -6.9 0.5 c-0.3 2.1 2.8 3.0 3.4 1.0 M0.0 91.5 L8.5 100.0 L0.0 108.5 L-8.5 100.0 Z M4.3 104.3 c2.9 2.9 6.5 2.6 6.9 -0.5 c0.3 -2.1 -2.8 -3.0 -3.4 -1.0 M-4.3 104.3 c-2.9 2.9 -6.5 2.6 -6.9 -0.5 c-0.3 -2.1 2.8 -3.0 3.4 -1.0 M4.3 95.7 c2.9 -2.9 6.5 -2.6 6.9 0.5 c0.3 2.1 -2.8 3.0 -3.4 1.0 M-4.3 95.7 c-2.9 -2.9 -6.5 -2.6 -6.9 0.5 c-0.3 2.1 2.8 3.0 3.4 1.0 M100.0 91.5 L108.5 100.0 L100.0 108.5 L91.5 100.0 Z M104.3 104.3 c2.9 2.9 6.5 2.6 6.9 -0.5 c0.3 -2.1 -2.8 -3.0 -3.4 -1.0 M95.7 104.3 c-2.9 2.9 -6.5 2.6 -6.9 -0.5 c-0.3 -2.1 2.8 -3.0 3.4 -1.0 M104.3 95.7 c2.9 -2.9 6.5 -2.6 6.9 0.5 c0.3 2.1 -2.8 3.0 -3.4 1.0 M95.7 95.7 c-2.9 -2.9 -6.5 -2.6 -6.9 0.5 c-0.3 2.1 2.8 3.0 3.4 1.0'/></g></svg>");
  background-size: 6rem 6rem;
  opacity: 0.17;
}

.latticed--deep::before {
  background-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100'><g fill='none' stroke='%23BBD6EE' stroke-linecap='round' stroke-linejoin='round'><path stroke-width='2.1' d='M0 0 H100 M0 0 V100 M0 0 L100 100 M100 0 L0 100'/><path stroke-width='1.8' d='M50.0 50.0 Q41.3 8.7 0.0 0.0 M50.0 50.0 Q8.7 41.3 0.0 0.0 M50.0 50.0 Q91.3 41.3 100.0 0.0 M50.0 50.0 Q58.7 8.7 100.0 0.0 M50.0 50.0 Q8.7 58.7 0.0 100.0 M50.0 50.0 Q41.3 91.3 0.0 100.0 M50.0 50.0 Q58.7 91.3 100.0 100.0 M50.0 50.0 Q91.3 58.7 100.0 100.0'/><path stroke-width='1.4' d='M50.0 41.5 L58.5 50.0 L50.0 58.5 L41.5 50.0 Z M54.3 54.3 c2.9 2.9 6.5 2.6 6.9 -0.5 c0.3 -2.1 -2.8 -3.0 -3.4 -1.0 M45.7 54.3 c-2.9 2.9 -6.5 2.6 -6.9 -0.5 c-0.3 -2.1 2.8 -3.0 3.4 -1.0 M54.3 45.7 c2.9 -2.9 6.5 -2.6 6.9 0.5 c0.3 2.1 -2.8 3.0 -3.4 1.0 M45.7 45.7 c-2.9 -2.9 -6.5 -2.6 -6.9 0.5 c-0.3 2.1 2.8 3.0 3.4 1.0 M0.0 -8.5 L8.5 0.0 L0.0 8.5 L-8.5 0.0 Z M4.3 4.3 c2.9 2.9 6.5 2.6 6.9 -0.5 c0.3 -2.1 -2.8 -3.0 -3.4 -1.0 M-4.3 4.3 c-2.9 2.9 -6.5 2.6 -6.9 -0.5 c-0.3 -2.1 2.8 -3.0 3.4 -1.0 M4.3 -4.3 c2.9 -2.9 6.5 -2.6 6.9 0.5 c0.3 2.1 -2.8 3.0 -3.4 1.0 M-4.3 -4.3 c-2.9 -2.9 -6.5 -2.6 -6.9 0.5 c-0.3 2.1 2.8 3.0 3.4 1.0 M100.0 -8.5 L108.5 0.0 L100.0 8.5 L91.5 0.0 Z M104.3 4.3 c2.9 2.9 6.5 2.6 6.9 -0.5 c0.3 -2.1 -2.8 -3.0 -3.4 -1.0 M95.7 4.3 c-2.9 2.9 -6.5 2.6 -6.9 -0.5 c-0.3 -2.1 2.8 -3.0 3.4 -1.0 M104.3 -4.3 c2.9 -2.9 6.5 -2.6 6.9 0.5 c0.3 2.1 -2.8 3.0 -3.4 1.0 M95.7 -4.3 c-2.9 -2.9 -6.5 -2.6 -6.9 0.5 c-0.3 2.1 2.8 3.0 3.4 1.0 M0.0 91.5 L8.5 100.0 L0.0 108.5 L-8.5 100.0 Z M4.3 104.3 c2.9 2.9 6.5 2.6 6.9 -0.5 c0.3 -2.1 -2.8 -3.0 -3.4 -1.0 M-4.3 104.3 c-2.9 2.9 -6.5 2.6 -6.9 -0.5 c-0.3 -2.1 2.8 -3.0 3.4 -1.0 M4.3 95.7 c2.9 -2.9 6.5 -2.6 6.9 0.5 c0.3 2.1 -2.8 3.0 -3.4 1.0 M-4.3 95.7 c-2.9 -2.9 -6.5 -2.6 -6.9 0.5 c-0.3 2.1 2.8 3.0 3.4 1.0 M100.0 91.5 L108.5 100.0 L100.0 108.5 L91.5 100.0 Z M104.3 104.3 c2.9 2.9 6.5 2.6 6.9 -0.5 c0.3 -2.1 -2.8 -3.0 -3.4 -1.0 M95.7 104.3 c-2.9 2.9 -6.5 2.6 -6.9 -0.5 c-0.3 -2.1 2.8 -3.0 3.4 -1.0 M104.3 95.7 c2.9 -2.9 6.5 -2.6 6.9 0.5 c0.3 2.1 -2.8 3.0 -3.4 1.0 M95.7 95.7 c-2.9 -2.9 -6.5 -2.6 -6.9 0.5 c-0.3 2.1 2.8 3.0 3.4 1.0'/></g></svg>");
  opacity: 0.17;
}

/* 首頁只開一扇窗：圖樣照樣平鋪，用遮罩讓它從右上角往內化開 */
.hero::before {
  opacity: 0.34;
  -webkit-mask-image: radial-gradient(115% 135% at 100% 0%, #000 8%, transparent 68%);
          mask-image: radial-gradient(115% 135% at 100% 0%, #000 8%, transparent 68%);
}

@media (max-width: 46rem) {
  .latticed::before { background-size: 4.5rem 4.5rem; }
}

/* ── 404 ─────────────────────────────────────────────── */
/* 內容很短的頁面：頁尾要貼齊視窗底部，不能浮在中間、底下露出一截白 */
.page-short { min-height: 100vh; min-height: 100dvh; display: flex; flex-direction: column; }
.page-short main { flex: 1; }
.back { margin: 2.25rem 0 0; font-size: 0.95rem; letter-spacing: 0.04em; }
.back a { color: var(--accent); text-decoration: none; border-bottom: 1px solid var(--accent-tint); padding-bottom: 0.12em; transition: border-color 0.15s; }
.back a:hover { border-color: var(--accent); }