/* 讀帖介紹網站的共用樣式。
 * 沿用 mycalligraphy 的 DESIGN.md「砂上之石」：白砂 #E2E0DA、紙白 #F2F0EB、墨 #1C1A17，
 * 朱紅只給印記、石青只給可以按的東西與「現在的位置」。固定淺色，直角，不用外部字體與腳本。
 * 內文不小於 17px，行寬不超過約 36 個中文字。 */

:root {
  color-scheme: light;
  --sand: #E2E0DA;
  --sand-shade: #D6D3CB;
  --paper: #F2F0EB;
  --seal: #9E2B1D;
  --seal-paper: #F3EEE3;
  --ink: #1C1A17;
  --ink-soft: #3A362F;
  --ink-old: #48443C;
  --accent: #2C5F78;
  --rule: rgba(58, 54, 47, 0.28);
  --serif: "Songti TC", "Noto Serif CJK TC", "Noto Serif TC", "PMingLiU", serif;
  --sans: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  --gutter: clamp(20px, 4vw, 56px);
}
html:lang(en) {
  --serif: Georgia, "Songti TC", "Noto Serif CJK TC", "Noto Serif TC", serif;
  --sans: -apple-system, "Helvetica Neue", "PingFang TC", "Noto Sans TC", system-ui, sans-serif;
}

* { box-sizing: border-box; border-radius: 0; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 18px/1.9 var(--sans);
  overflow-wrap: break-word;
}
html:lang(en) body { line-height: 1.7; }
body.home, body.lost { background: var(--sand); }

a { color: var(--accent); text-underline-offset: 0.2em; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.skip { position: absolute; left: 8px; top: -64px; z-index: 5; background: var(--paper); padding: 8px 14px; }
.skip:focus { top: 8px; }

/* ---------- 朱印 ---------- */
.seal {
  display: inline-grid;
  place-items: center;
  flex: none;
  width: 26px;
  height: 26px;
  background: var(--seal);
  color: var(--seal-paper);
  font: 400 19px/1 var(--serif);
}

/* ---------- 內頁的頁首、內文、頁尾 ---------- */
.bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 24px;
  align-items: center;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  padding: 20px var(--gutter);
}
.brand {
  display: inline-flex;
  gap: 12px;
  align-items: center;
  color: var(--ink);
  font: 400 22px/1 var(--serif);
  letter-spacing: 0.14em;
  text-decoration: none;
}
.brand:hover { color: var(--accent); }
.bar-nav { display: flex; flex-wrap: wrap; gap: 4px 20px; font-size: 17px; }
.bar-nav a { display: inline-block; padding: 8px 0; }

.prose { max-width: 36em; margin: 0 auto; padding: 24px var(--gutter) 72px; }
html:lang(en) .prose { max-width: 40em; }
.prose h1 {
  margin: 32px 0 12px;
  font: 400 clamp(30px, 2.4vw + 14px, 38px)/1.3 var(--serif);
  letter-spacing: 0.2em;
}
html:lang(en) .prose h1 { letter-spacing: 0.02em; }
.prose h2 {
  margin: 2.4em 0 0.4em;
  padding-top: 1.1em;
  border-top: 1px solid var(--rule);
  font: 700 22px/1.5 var(--serif);
  letter-spacing: 2px;
}
html:lang(en) .prose h2 { letter-spacing: 0.01em; }
.prose h2:first-of-type { margin-top: 1.6em; }
.prose h3 { margin: 1.6em 0 0.2em; font: 700 18px/1.6 var(--serif); letter-spacing: 0.08em; }
html:lang(en) .prose h3 { letter-spacing: 0; }
.prose p, .prose ul, .prose ol, .prose dl { margin: 0 0 1em; }
.prose ul, .prose ol { padding-left: 1.5em; }
.prose li { margin-bottom: 0.4em; padding-left: 0.2em; }
.prose strong { font-weight: 700; }
.prose .meta { color: var(--ink-old); font-size: 17px; margin-top: 0; }
.prose .lede { font: 400 20px/1.9 var(--serif); letter-spacing: 0.04em; color: var(--ink-soft); }
html:lang(en) .prose .lede { letter-spacing: 0; line-height: 1.6; }
.prose .cite {
  margin: 1em 0 1.4em;
  padding: 0.6em 0 0.6em 1em;
  border-left: 3px solid var(--rule);
  font-family: var(--serif);
  color: var(--ink-soft);
}
.prose dt { margin-top: 1em; font-weight: 700; }
.prose dd { margin: 0 0 0.4em; }
.mail { font-weight: 600; }

.foot {
  border-top: 1px solid var(--rule);
  color: var(--ink-old);
  font-size: 15px;
  line-height: 1.7;
  letter-spacing: 0.04em;
}
.foot-inner { max-width: 1100px; margin: 0 auto; padding: 28px var(--gutter) 44px; }
.foot nav { display: flex; flex-wrap: wrap; gap: 0 22px; margin-bottom: 8px; }
.foot nav a { display: inline-block; padding: 9px 0; }
.foot p { margin: 0; }

/* ---------- 首頁：砂上之石 ---------- */
body.home { overflow-x: hidden; }
.topline { display: flex; justify-content: flex-end; max-width: 1240px; margin: 0 auto; padding: 14px var(--gutter) 0; font-size: 17px; }
.topline a { display: inline-block; padding: 8px 0; }

.hero {
  --ring-step: 22px;
  --ring-count: 5;
  --ring-reach: calc(var(--ring-step) * var(--ring-count));
  --paper-h: clamp(300px, calc(100svh - 370px), 560px);
  position: relative;
  /* 耙紋鋪滿整個寬度，內容仍限制在 1240px 內 */
  padding: 0 max(var(--gutter), calc((100% - 1240px) / 2 + var(--gutter))) 28px;
}
/* 耙紋：一道暗溝加一道斜光亮脊，每 22px 一組 */
.hero::before {
  content: "";
  position: absolute;
  inset: 0 0 0 0;
  background: repeating-linear-gradient(to bottom,
    transparent 0 20px,
    rgba(58, 54, 47, 0.13) 20px 21px,
    rgba(255, 255, 255, 0.42) 21px 22px);
  -webkit-mask-image: linear-gradient(to bottom, transparent, #000 90px, #000 calc(100% - 90px), transparent);
  mask-image: linear-gradient(to bottom, transparent, #000 90px, #000 calc(100% - 90px), transparent);
  pointer-events: none;
}
.hero > * { position: relative; }

.hero-grid {
  display: grid;
  grid-template-columns: auto auto auto;
  justify-content: center;
  align-items: start;
  column-gap: clamp(28px, 7vw, 120px);
  padding-top: 12px;
}

/* 石：落在砂上的字帖，四周是一圈圈耙紋 */
.stone { padding: var(--ring-reach); }
.rings {
  position: relative;
  height: var(--paper-h);
  aspect-ratio: 180 / 500;
  border-radius: 3px;
  background: var(--seal-paper);
  box-shadow:
    0 0 0 calc(var(--ring-step) * 1 - 1px) var(--sand),
    0 0 0 calc(var(--ring-step) * 1) rgba(58, 54, 47, 0.26),
    0 0 0 calc(var(--ring-step) * 2 - 1px) var(--sand),
    0 0 0 calc(var(--ring-step) * 2) rgba(58, 54, 47, 0.2),
    0 0 0 calc(var(--ring-step) * 3 - 1px) var(--sand),
    0 0 0 calc(var(--ring-step) * 3) rgba(58, 54, 47, 0.16),
    0 0 0 calc(var(--ring-step) * 4 - 1px) var(--sand),
    0 0 0 calc(var(--ring-step) * 4) rgba(58, 54, 47, 0.12),
    0 0 0 calc(var(--ring-step) * 5 - 1px) var(--sand),
    0 0 0 calc(var(--ring-step) * 5) rgba(58, 54, 47, 0.08);
}
/* 作品落影（偏向左下，與斜光一致） */
.paper {
  position: absolute;
  inset: 0;
  background: #F7F5F0;
  box-shadow:
    0 0 0 1px rgba(40, 34, 26, 0.08),
    -5px 9px 14px -4px rgba(40, 34, 26, 0.26),
    -22px 38px 60px -20px rgba(40, 34, 26, 0.34);
}
.paper img { position: absolute; inset: 0; width: 100%; height: 100%; display: block; }
/* 鏡位框：先看全貌，再逐段細看，最後回到全貌（石青＝現在的位置） */
.frame {
  position: absolute;
  border: 2px solid var(--accent);
  top: 0; left: 0; width: 100%; height: 100%;
  animation: frame-walk 16s ease-in-out infinite;
}
@keyframes frame-walk {
  0%, 12%   { top: 0;   left: 0;   width: 100%; height: 100%; }
  20%, 34%  { top: 4%;  left: 38%; width: 58%;  height: 28%; }
  42%, 56%  { top: 34%; left: 22%; width: 58%;  height: 28%; }
  64%, 78%  { top: 60%; left: 4%;  width: 58%;  height: 28%; }
  88%, 100% { top: 0;   left: 0;   width: 100%; height: 100%; }
}

/* 直排的站名與朱印、一句話；周圍的耙紋放淡 */
.calm { background: var(--sand); box-shadow: 0 0 22px 22px var(--sand); }
.mark { display: flex; flex-direction: column; align-items: center; gap: 18px; padding-top: var(--ring-reach); }
.mark .title-v, .mark h1 {
  margin: 0;
  font: 400 clamp(44px, 7.1svh, 64px)/1 var(--serif);
  letter-spacing: 0.16em;
  writing-mode: vertical-rl;
}
.mark .seal { width: 40px; height: 40px; font-size: 29px; }
.lead {
  margin: 0;
  align-self: center;
  font: 400 22px/1 var(--serif);
  letter-spacing: 0.22em;
  color: var(--ink-soft);
  writing-mode: vertical-rl;
}
.lead { z-index: 1; }
.lead span { display: block; }
.lead span + span { margin-block-start: 14px; padding-inline-start: 2.4em; }

.en-copy { align-self: center; max-width: 18em; }
.en-copy h1 { margin: 0 0 14px; font: 400 clamp(44px, 6vw, 64px)/1 var(--serif); letter-spacing: 0.06em; }
.en-copy p { margin: 0; font: 400 22px/1.6 var(--serif); color: var(--ink-soft); }

.stores {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  justify-content: center;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  font-size: 17px;
  color: var(--ink-soft);
}
.stores li { display: flex; gap: 12px; align-items: baseline; padding: 6px 0; }
.stores .soon { padding: 0 10px; border: 1px dashed var(--ink-old); color: var(--ink-old); font-size: 15px; line-height: 1.7; letter-spacing: 0.08em; }
.stores .name { font-family: var(--serif); letter-spacing: 0.04em; }

/* 首頁往下的說明段落 */
.sec {
  display: grid;
  grid-template-columns: minmax(7em, 11em) minmax(0, 36em);
  gap: 12px 64px;
  justify-content: center;
  max-width: 1100px;
  margin: 0 auto;
  padding: 56px var(--gutter);
  border-top: 1px solid var(--rule);
}
html:lang(en) .sec { grid-template-columns: minmax(8em, 11em) minmax(0, 40em); }
.sec h2 { margin: 0; font: 700 24px/1.5 var(--serif); letter-spacing: 2px; }
html:lang(en) .sec h2 { letter-spacing: 0.01em; }
.sec p { margin: 0 0 1em; }
.sec p:last-child { margin-bottom: 0; }
.steps { margin: 0 0 1em; padding: 0; list-style: none; counter-reset: step; }
.steps li { position: relative; margin: 0 0 1.1em; padding-left: 2.6em; counter-increment: step; }
.steps li::before {
  content: counter(step, trad-chinese-informal);
  position: absolute;
  left: 0;
  top: 0;
  font: 700 22px/1.7 var(--serif);
  color: var(--ink);
}
html:lang(en) .steps li::before { content: counter(step); }
.steps b { display: block; font-family: var(--serif); font-size: 19px; letter-spacing: 0.1em; }
html:lang(en) .steps b { letter-spacing: 0; }

/* ---------- 404 ---------- */
.lost-main { display: grid; place-items: center; min-height: calc(100svh - 190px); padding: 40px var(--gutter); text-align: center; }
.lost-main h1 { margin: 0 0 8px; font: 400 clamp(30px, 6vw, 40px)/1.4 var(--serif); letter-spacing: 0.2em; }
.lost-main p { margin: 0 0 12px; }

/* ---------- 窄螢幕 ---------- */
@media (max-width: 860px) {
  .hero { --ring-step: 14px; --ring-count: 3; --paper-h: clamp(250px, calc(100svh - 360px), 400px); }
  .rings {
    box-shadow:
      0 0 0 calc(var(--ring-step) * 1 - 1px) var(--sand),
      0 0 0 calc(var(--ring-step) * 1) rgba(58, 54, 47, 0.26),
      0 0 0 calc(var(--ring-step) * 2 - 1px) var(--sand),
      0 0 0 calc(var(--ring-step) * 2) rgba(58, 54, 47, 0.2),
      0 0 0 calc(var(--ring-step) * 3 - 1px) var(--sand),
      0 0 0 calc(var(--ring-step) * 3) rgba(58, 54, 47, 0.14);
  }
  .hero-grid { grid-template-columns: auto 1fr auto; column-gap: 8px; }
  .mark .title-v, .mark h1 { font-size: clamp(44px, 12.4vw, 64px); }
  .lead { justify-self: center; font-size: 19px; }
  .sec { grid-template-columns: minmax(0, 36em); gap: 8px; padding: 44px var(--gutter); }
  html:lang(en) .sec { grid-template-columns: minmax(0, 40em); }
  /* 英文版：文字放到下一排 */
  .en-copy { grid-column: 1 / -1; grid-row: 2; align-self: start; max-width: none; padding-top: 24px; }
}
@media (max-width: 520px) {
  body.home, .hero { --gutter: 28px; }
  /* 字帖的寬度同時受可用寬度限制（高 ≤ 80vw，寬約 29vw），不擠到右邊的說明與站名 */
  .hero { --ring-count: 2; --paper-h: clamp(220px, min(calc(100svh - 440px), 80vw), 330px); }
  /* 窄版的放淡遮罩只留一圈薄邊，不蓋到相鄰的直排說明 */
  .calm { box-shadow: 0 0 8px 6px var(--sand); }
  .rings {
    box-shadow:
      0 0 0 calc(var(--ring-step) * 1 - 1px) var(--sand),
      0 0 0 calc(var(--ring-step) * 1) rgba(58, 54, 47, 0.26),
      0 0 0 calc(var(--ring-step) * 2 - 1px) var(--sand),
      0 0 0 calc(var(--ring-step) * 2) rgba(58, 54, 47, 0.2);
  }
  .mark .title-v, .mark h1 { font-size: 10vw; letter-spacing: 0.12em; min-width: 40px; }
  .mark { gap: 14px; }
  .mark .seal { width: 44px; height: 44px; }
  .lead { font-size: 17px; letter-spacing: 0.16em; }
  .prose { padding-top: 8px; }
}

/* 偏好減少動態：鏡位框停在全貌 */
@media (max-width: 360px) {
  body.home, .hero { --gutter: 20px; }
  /* 說明維持 17px；靠縮小留白與朱印騰出空間，不縮字 */
  .lead { letter-spacing: 0.12em; }
  .mark .seal { width: 40px; height: 40px; }
}

@media (prefers-reduced-motion: reduce) {
  .frame { animation: none; }
}
@media print {
  .hero::before, .frame { display: none; }
}