/* Field Notes · 在路上 — 独立旅行杂志
   视觉主张：暖白纸张、深棕墨色、焦糖批注；衬线标题 + 无衬线正文；摄影优先，留白呼吸。 */

:root {
  --paper: #f6f1e7;
  --paper-2: #efe6d6;
  --paper-3: #e7dcc8;
  --ink: #2b211a;
  --ink-2: #4a3a2e;
  --ink-3: #7a6757;
  --caramel: #b4653a;
  --caramel-deep: #8e4a26;
  --moss: #5c6a4d;
  --rule: rgba(43, 33, 26, .14);
  --rule-strong: rgba(43, 33, 26, .3);

  --serif: "Songti SC", "STSong", "Noto Serif SC", "Source Han Serif SC", "Source Han Serif CN",
           SimSun, Georgia, "Times New Roman", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC",
          "Helvetica Neue", Helvetica, Arial, sans-serif;

  --measure: 34rem;
  --gutter: clamp(1.25rem, 4vw, 4.5rem);
  --maxw: 1280px;
  --radius: 2px;
  --shadow: 0 18px 40px -28px rgba(43, 33, 26, .55);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  /* 纸张纤维：极淡的斜向纹理 + 中心提亮，避免大面积纯色发闷 */
  background-image:
    repeating-linear-gradient(114deg, rgba(43, 33, 26, .022) 0 1px, transparent 1px 4px),
    radial-gradient(120% 80% at 50% -10%, rgba(255, 253, 247, .9), transparent 60%);
  background-attachment: fixed;
}

img { display: block; max-width: 100%; }

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; letter-spacing: .005em; }

a { color: inherit; text-decoration: none; }

::selection { background: rgba(180, 101, 58, .25); }

:focus-visible {
  outline: 2px solid var(--caramel);
  outline-offset: 3px;
}

.skip {
  position: absolute; left: .75rem; top: -3rem; z-index: 40;
  background: var(--ink); color: var(--paper);
  padding: .5rem .9rem; font-size: .85rem;
}
.skip:focus { top: .75rem; }

.vh {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap; border: 0;
}

/* 图片绝对定位填满比例盒：不参与尺寸计算，加载失败时占位层自然露出 */
.card__shot img, .cover__frame img, .reading__hero img, .author__shot img {
  position: absolute; inset: 0; z-index: 1;
}
.card, .card__shot, .card > div, .card--row > *, .cover__body > *, .author__grid > *, .reading__bar > * { min-width: 0; }

.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }

/* ── 报头 ───────────────────────────────────────────── */
.masthead {
  position: sticky; top: 0; z-index: 20;
  background: rgba(246, 241, 231, .93);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}
.masthead__inner {
  width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter);
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 1.5rem;
  min-height: 72px;
}
.wordmark { display: flex; align-items: baseline; gap: .6rem; }
.wordmark__en {
  font-family: var(--serif); font-size: 1.4rem; font-weight: 600; letter-spacing: .02em;
}
.wordmark__cn {
  font-family: var(--serif); font-size: .95rem; color: var(--caramel); letter-spacing: .32em;
  padding-left: .55rem; border-left: 1px solid var(--rule-strong);
}
.masthead__issue {
  margin: 0; display: flex; align-items: center; gap: .85rem;
  font-size: .72rem; letter-spacing: .22em; color: var(--ink-3); text-transform: uppercase;
}
.masthead__issue i { width: 22px; height: 1px; background: var(--rule-strong); display: block; }
.masthead__nav { display: flex; align-items: center; gap: 1.35rem; }
.masthead__nav > a {
  font-size: .84rem; letter-spacing: .12em; color: var(--ink-2);
  padding-bottom: 3px; border-bottom: 1px solid transparent; transition: border-color .18s, color .18s;
}
.masthead__nav > a:hover { color: var(--caramel); border-bottom-color: var(--caramel); }

/* ── 小控件 ─────────────────────────────────────────── */
.chip {
  font-family: var(--sans); font-size: .82rem; letter-spacing: .1em;
  color: var(--ink-2); background: transparent;
  border: 1px solid var(--rule-strong); border-radius: 999px;
  padding: .38rem .95rem; cursor: pointer;
  display: inline-flex; align-items: center; gap: .45rem;
  transition: background-color .18s, color .18s, border-color .18s;
}
.chip:hover { border-color: var(--caramel); color: var(--caramel-deep); }
.chip[aria-pressed="true"], .chip.is-on {
  background: var(--ink); border-color: var(--ink); color: var(--paper);
}
.chip__count {
  font-family: var(--serif); font-size: .78rem; min-width: 1.4em; text-align: center;
  color: var(--caramel);
}
.chip[aria-pressed="true"] .chip__count { color: var(--paper-2); }

.eyebrow {
  font-size: .7rem; letter-spacing: .3em; text-transform: uppercase;
  color: var(--caramel-deep); margin: 0;
}
.meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: .55rem;
  font-size: .78rem; letter-spacing: .1em; color: var(--ink-3);
}
.meta i { width: 3px; height: 3px; border-radius: 50%; background: currentColor; opacity: .55; }

/* ── 封面 ───────────────────────────────────────────── */
.cover { padding-top: clamp(1.75rem, 4vw, 3.5rem); }
.cover__frame {
  position: relative; overflow: hidden; background: var(--paper-3);
  border-radius: var(--radius); box-shadow: var(--shadow);
  aspect-ratio: 21 / 10;
}
.cover__frame img { width: 100%; height: 100%; object-fit: cover; }
.cover__scrim {
  position: absolute; inset: 0;
  background: linear-gradient(78deg, rgba(28, 20, 15, .72) 0%, rgba(28, 20, 15, .28) 46%, transparent 78%);
}
.cover__tag {
  position: absolute; left: clamp(1rem, 3vw, 2.5rem); bottom: clamp(1rem, 3vw, 2rem);
  color: #f7f2e8; max-width: 40ch;
}
.cover__tag .eyebrow { color: #e8b58e; }
.cover__tag h1 {
  margin: .6rem 0 .5rem; font-size: clamp(2rem, 5.2vw, 3.9rem); line-height: 1.14;
  text-shadow: 0 2px 24px rgba(20, 14, 10, .35);
}
.cover__tag p { margin: 0; font-size: clamp(.95rem, 1.4vw, 1.12rem); color: rgba(247, 242, 232, .86); }
.cover__tag h1 a { color: inherit; }
.cover__tag h1 a:hover { color: #f0c9a8; }

.cover__body {
  display: grid; grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 5vw, 4.5rem); align-items: start;
  padding-block: clamp(1.5rem, 3vw, 2.75rem) clamp(2rem, 5vw, 4rem);
}
.cover__lede { font-family: var(--serif); font-size: clamp(1.05rem, 1.7vw, 1.3rem); line-height: 1.9; color: var(--ink-2); margin: 1rem 0 1.6rem; }
.cover__drop::first-letter { font-size: 3.1em; float: left; line-height: .82; padding: .08em .12em 0 0; color: var(--caramel); }
.cover__side { border-left: 1px solid var(--rule); padding-left: clamp(1rem, 2.5vw, 2rem); }
.cover__side dl { margin: 0 0 1.5rem; display: grid; grid-template-columns: auto 1fr; gap: .45rem 1rem; font-size: .85rem; }
.cover__side dt { color: var(--ink-3); letter-spacing: .16em; font-size: .72rem; text-transform: uppercase; align-self: center; }
.cover__side dd { margin: 0; font-family: var(--serif); }

.actions { display: flex; flex-wrap: wrap; gap: .75rem; align-items: center; }
.btn {
  font-family: var(--sans); font-size: .86rem; letter-spacing: .1em;
  display: inline-flex; align-items: center; gap: .6rem;
  padding: .78rem 1.5rem; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--ink); background: var(--ink); color: var(--paper);
  transition: transform .16s ease, background-color .18s, color .18s, border-color .18s;
}
.btn:hover { background: var(--caramel-deep); border-color: var(--caramel-deep); transform: translateY(-1px); }
.btn--ghost { background: transparent; color: var(--ink); border-color: var(--rule-strong); }
.btn--ghost:hover { background: transparent; color: var(--caramel-deep); border-color: var(--caramel); transform: none; }

.save {
  font-family: var(--sans); font-size: .8rem; letter-spacing: .1em;
  display: inline-flex; align-items: center; gap: .5rem; cursor: pointer;
  background: transparent; border: 1px solid var(--rule-strong); border-radius: 999px;
  padding: .45rem .95rem; color: var(--ink-2);
  transition: border-color .18s, color .18s, background-color .18s;
}
.save svg { width: 15px; height: 15px; fill: none; stroke: currentColor; stroke-width: 1.5; }
.save:hover { border-color: var(--caramel); color: var(--caramel-deep); }
.save[aria-pressed="true"] { border-color: var(--caramel); color: var(--caramel-deep); background: rgba(180, 101, 58, .1); }
.save[aria-pressed="true"] svg { fill: var(--caramel); stroke: var(--caramel); }

/* ── 目录工具条 ─────────────────────────────────────── */
.rail {
  display: flex; flex-wrap: wrap; align-items: center; gap: 1rem 1.5rem;
  padding-block: 1.15rem; border-block: 1px solid var(--rule);
  position: sticky; top: 72px; z-index: 15; background: rgba(246, 241, 231, .95);
  backdrop-filter: blur(8px);
}
.rail__title { font-family: var(--serif); font-size: 1.05rem; letter-spacing: .06em; margin: 0; white-space: nowrap; }
.filters { display: flex; flex-wrap: wrap; gap: .5rem; }
.search { margin-left: auto; position: relative; display: flex; align-items: center; }
.search svg { position: absolute; left: .8rem; width: 15px; height: 15px; stroke: var(--ink-3); fill: none; stroke-width: 1.6; pointer-events: none; }
.search input {
  font-family: var(--sans); font-size: .88rem; color: var(--ink);
  background: rgba(255, 253, 248, .7); border: 1px solid var(--rule-strong); border-radius: 999px;
  padding: .55rem .9rem .55rem 2.25rem; width: min(19rem, 46vw);
}
.search input::placeholder { color: var(--ink-3); letter-spacing: .06em; }
.search input:focus { border-color: var(--caramel); outline: none; background: #fffdf8; }
.search__clear {
  position: absolute; right: .5rem; border: 0; background: transparent; cursor: pointer;
  color: var(--ink-3); font-size: 1.1rem; line-height: 1; padding: .2rem .35rem;
}
.search__clear:hover { color: var(--caramel-deep); }

.count { font-size: .76rem; letter-spacing: .14em; color: var(--ink-3); }
#result-count { white-space: nowrap; }

/* ── 错落文章网格 ───────────────────────────────────── */
.grid {
  display: grid; grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(2rem, 4.5vw, 4.5rem) clamp(1.5rem, 3vw, 2.75rem);
  padding-block: clamp(2.5rem, 5vw, 4.5rem) clamp(3rem, 6vw, 5rem);
}
.card { grid-column: span 6; position: relative; }
.card--s7 { grid-column: span 7; }
.card--s5 { grid-column: span 5; }
.card--s12 { grid-column: span 12; }
.card--push { margin-top: clamp(2rem, 6vw, 6.5rem); }

.card__shot {
  position: relative; display: block; overflow: hidden; background: var(--paper-3);
  border-radius: var(--radius); margin-bottom: 1.15rem;
}
.card__shot img { width: 100%; height: 100%; object-fit: cover; transition: transform .7s cubic-bezier(.2, .6, .2, 1), filter .4s; }
.card__shot:hover img, .card__shot:focus-visible img { transform: scale(1.035); }
.card__cat {
  position: absolute; left: .85rem; top: .85rem; z-index: 2;
  font-size: .68rem; letter-spacing: .22em; padding: .28rem .7rem; border-radius: 999px;
  background: rgba(246, 241, 231, .92); color: var(--ink-2);
}
.card h3 { margin: 0 0 .55rem; font-size: clamp(1.3rem, 2.1vw, 1.72rem); line-height: 1.32; }
.card h3 a { background-image: linear-gradient(var(--caramel), var(--caramel)); background-size: 0 1px; background-repeat: no-repeat; background-position: 0 100%; transition: background-size .3s; }
.card h3 a:hover { color: var(--caramel-deep); background-size: 100% 1px; }
.card__excerpt { margin: .7rem 0 1rem; font-size: .93rem; line-height: 1.85; color: var(--ink-2); }
.card__foot { display: flex; align-items: center; justify-content: space-between; gap: 1rem; border-top: 1px solid var(--rule); padding-top: .85rem; }

/* 横卡（宽幅条目） */
.card--row { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); gap: clamp(1.25rem, 3vw, 2.75rem); align-items: center; }
.card--row .card__shot { margin-bottom: 0; }

/* ── 图片缺失时的协调占位 ───────────────────────────── */
.shot__fallback {
  position: absolute; inset: 0; display: flex; flex-direction: column; justify-content: flex-end;
  gap: .35rem; padding: 1.15rem; overflow: hidden;
  background:
    repeating-linear-gradient(118deg, rgba(255,255,255,.14) 0 1px, transparent 1px 7px),
    linear-gradient(150deg, var(--tone-a, #cbb69a) 0%, var(--tone-b, #7a6757) 100%);
}
.shot__fallback::after {
  content: ""; position: absolute; inset: -30% -10% auto; height: 62%;
  background: radial-gradient(60% 100% at 30% 0%, rgba(255,250,240,.5), transparent 70%);
}
.shot__fallback b {
  position: relative; z-index: 1; font-family: var(--serif); font-weight: 600;
  font-size: clamp(1.6rem, 3.4vw, 2.6rem); line-height: 1.1; color: rgba(255, 252, 245, .92);
  letter-spacing: .04em;
}
.shot__fallback span {
  position: relative; z-index: 1; font-size: .66rem; letter-spacing: .26em; text-transform: uppercase;
  color: rgba(255, 252, 245, .72);
}
.shot__fallback i {
  position: absolute; right: 1.1rem; bottom: 1.1rem; z-index: 1; width: 34px; height: 34px;
  border: 1px solid rgba(255,252,245,.5); border-radius: 50%;
  background: linear-gradient(180deg, transparent 48%, rgba(255,252,245,.55) 48% 52%, transparent 52%);
}
.card__shot img.is-broken, .cover__frame img.is-broken, .reading__hero img.is-broken { display: none; }

/* ── 空状态 ─────────────────────────────────────────── */
.empty {
  grid-column: 1 / -1; text-align: center; padding: clamp(3rem, 8vw, 6rem) 1.5rem;
  border: 1px dashed var(--rule-strong); border-radius: var(--radius); background: rgba(255, 253, 248, .5);
}
.empty h3 { margin: .8rem 0 .5rem; font-size: 1.5rem; }
.empty p { margin: 0 0 1.5rem; color: var(--ink-3); font-size: .92rem; }

/* ── 作者 ───────────────────────────────────────────── */
.author { border-top: 1px solid var(--rule); padding-block: clamp(3rem, 6vw, 5.5rem); }
.author__grid { display: grid; grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr); gap: clamp(1.75rem, 5vw, 4.5rem); align-items: start; }
.author__shot { position: relative; overflow: hidden; border-radius: var(--radius); aspect-ratio: 4 / 5; background: var(--paper-3); box-shadow: var(--shadow); }
.author__shot img { width: 100%; height: 100%; object-fit: cover; }
.author__body h2 { margin: .9rem 0 1rem; font-size: clamp(1.7rem, 3vw, 2.5rem); line-height: 1.3; }
.author__body p { margin: 0 0 1.1rem; color: var(--ink-2); }
.author__facts { list-style: none; margin: 1.75rem 0 0; padding: 1.5rem 0 0; border-top: 1px solid var(--rule); display: grid; grid-template-columns: repeat(auto-fit, minmax(9rem, 1fr)); gap: 1.25rem; }
.author__facts li { font-size: .84rem; color: var(--ink-3); }
.author__facts b { display: block; font-family: var(--serif); font-size: 1.45rem; color: var(--ink); margin-bottom: .15rem; }
.pull {
  margin: 1.75rem 0; padding-left: 1.25rem; border-left: 2px solid var(--caramel);
  font-family: var(--serif); font-size: 1.12rem; line-height: 1.85; color: var(--ink);
}

/* ── 阅读视图 ───────────────────────────────────────── */
.reading { padding-bottom: clamp(3rem, 7vw, 6rem); }
.reading__bar {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  padding-block: 1.5rem 1.75rem; border-bottom: 1px solid var(--rule);
}
.back {
  display: inline-flex; align-items: center; gap: .55rem; cursor: pointer;
  background: transparent; border: 0; padding: .35rem 0; font-family: var(--sans);
  font-size: .84rem; letter-spacing: .12em; color: var(--ink-2);
}
.back:hover { color: var(--caramel-deep); }
.back svg { width: 16px; height: 16px; stroke: currentColor; fill: none; stroke-width: 1.5; transition: transform .2s; }
.back:hover svg { transform: translateX(-3px); }

.reading__head { max-width: 52rem; margin-inline: auto; padding-block: clamp(2rem, 5vw, 3.75rem) clamp(1.5rem, 3vw, 2.25rem); }
.reading__head h1 { margin: 1rem 0 .8rem; font-size: clamp(1.9rem, 5vw, 3.35rem); line-height: 1.24; }
.reading__standfirst { margin: 0; font-family: var(--serif); font-size: clamp(1rem, 1.6vw, 1.22rem); line-height: 1.85; color: var(--ink-2); }
.reading__byline { margin-top: 1.75rem; padding-top: 1.25rem; border-top: 1px solid var(--rule); display: flex; flex-wrap: wrap; gap: .5rem 1.25rem; align-items: center; justify-content: space-between; }

.reading__hero { position: relative; overflow: hidden; border-radius: var(--radius); aspect-ratio: 16 / 9; background: var(--paper-3); box-shadow: var(--shadow); }
.reading__hero img { width: 100%; height: 100%; object-fit: cover; }
.head-figure { margin: 0 0 clamp(2rem, 4vw, 3rem); }
figcaption { margin-top: .8rem; font-size: .76rem; letter-spacing: .06em; color: var(--ink-3); display: flex; gap: .6rem; align-items: baseline; }
figcaption b { color: var(--caramel-deep); font-weight: 500; letter-spacing: .18em; font-size: .68rem; text-transform: uppercase; flex: none; }

.prose { max-width: var(--measure); margin-inline: auto; padding-block: clamp(2.25rem, 5vw, 3.75rem); }
.prose p { margin: 0 0 1.55em; font-size: 1.06rem; line-height: 2.05; color: #33281f; }
.prose h2 { margin: 2.75em 0 1.1em; font-size: clamp(1.3rem, 2.4vw, 1.7rem); line-height: 1.45; }
.prose h2::before { content: attr(data-num); display: block; font-family: var(--serif); font-size: .78rem; letter-spacing: .3em; color: var(--caramel); margin-bottom: .6rem; }
.prose > p:first-of-type::first-letter { font-family: var(--serif); font-size: 3.4em; float: left; line-height: .8; padding: .1em .14em 0 0; color: var(--caramel); }
.prose blockquote {
  margin: 2.5em 0; padding: 1.5rem 0 1.5rem 1.75rem; border-left: 2px solid var(--caramel);
  font-family: var(--serif); font-size: 1.25rem; line-height: 1.8; color: var(--ink);
}
.prose blockquote cite { display: block; margin-top: .8rem; font-size: .76rem; font-style: normal; letter-spacing: .18em; color: var(--ink-3); }
.prose figure { margin: 2.75em 0; }
.prose figure.wide { max-width: none; margin-inline: calc(50% - 50vw + var(--gutter)); padding-inline: 0; }
.prose figure.wide .reading__hero { border-radius: 0; box-shadow: none; aspect-ratio: 21 / 9; }
.prose ul.notes { list-style: none; margin: .5em 0 2.5em; padding: 0; border-top: 0; }
.prose .notes-label { margin: 2.5em 0 1.1em; padding-top: 1.5rem; border-top: 1px solid var(--rule); }
.prose ul.notes li { position: relative; padding: 0 0 1.05rem 1.6rem; font-size: .95rem; line-height: 1.85; color: var(--ink-2); }
.prose ul.notes li::before { content: ""; position: absolute; left: 0; top: .72em; width: .65rem; height: 1px; background: var(--caramel); }
.prose .divider { display: flex; align-items: center; gap: 1rem; margin: 3em 0; color: var(--rule-strong); }
.prose .divider::before, .prose .divider::after { content: ""; height: 1px; background: var(--rule); flex: 1; }
.prose .divider span { font-family: var(--serif); font-size: .8rem; letter-spacing: .3em; color: var(--ink-3); }

.tags { display: flex; flex-wrap: wrap; gap: .5rem; margin: 2.5rem 0 0; }
.tag { font-size: .74rem; letter-spacing: .14em; color: var(--ink-3); border: 1px solid var(--rule); border-radius: 999px; padding: .3rem .8rem; cursor: pointer; background: transparent; }
.tag:hover { border-color: var(--caramel); color: var(--caramel-deep); }

.endcard { max-width: var(--measure); margin: 0 auto; border-top: 1px solid var(--rule); padding-top: 2rem; display: flex; flex-wrap: wrap; gap: 1.25rem; align-items: center; justify-content: space-between; }
.endcard .count { margin: 0; }

.nextprev { max-width: var(--measure); margin: 3.5rem auto 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(15rem, 1fr)); gap: 1.5rem 2.5rem; border-top: 1px solid var(--rule); padding-top: 2rem; }
.nextprev a { display: block; }
.nextprev span { display: block; font-size: .68rem; letter-spacing: .26em; text-transform: uppercase; color: var(--ink-3); margin-bottom: .5rem; }
.nextprev b { font-family: var(--serif); font-size: 1.12rem; font-weight: 600; line-height: 1.5; }
.nextprev .next { text-align: right; }

/* ── 页脚 / 提示 ────────────────────────────────────── */
.colophon { border-top: 1px solid var(--rule); background: var(--paper-2); }
.colophon__inner { width: 100%; max-width: var(--maxw); margin-inline: auto; padding: clamp(2.5rem, 5vw, 4rem) var(--gutter); display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); gap: 2.5rem; }
.colophon__mark { font-family: var(--serif); font-size: 1.15rem; margin: 0 0 .8rem; }
.colophon__note { margin: 0; font-size: .84rem; line-height: 1.9; color: var(--ink-3); max-width: 46ch; }
.colophon__list { list-style: none; margin: 0; padding: 0; font-size: .84rem; color: var(--ink-3); display: grid; gap: .7rem; }
.colophon__list span { display: block; font-family: var(--serif); font-size: .95rem; color: var(--ink); }
.mailbtn {
  font-family: var(--sans); font-size: .84rem; letter-spacing: .1em; color: var(--ink);
  background: transparent; border: 0; padding: .35rem .15rem; margin-inline: -.15rem; cursor: pointer;
  text-decoration: underline; text-underline-offset: .22em; text-decoration-color: var(--rule-strong);
  transition: color .18s, text-decoration-color .18s;
}
.mailbtn:hover { color: var(--caramel-deep); text-decoration-color: var(--caramel); }
.mailbtn.is-shown { font-family: var(--serif); font-size: .95rem; letter-spacing: .02em; }

.toast {
  position: fixed; left: 50%; bottom: 2rem; transform: translate(-50%, 1.25rem);
  background: var(--ink); color: var(--paper); font-size: .84rem; letter-spacing: .08em;
  padding: .7rem 1.25rem; border-radius: 999px; box-shadow: 0 12px 30px -12px rgba(43,33,26,.6);
  opacity: 0; pointer-events: none; transition: opacity .25s, transform .25s; z-index: 30; max-width: min(90vw, 30rem);
}
.toast.is-on { opacity: 1; transform: translate(-50%, 0); }

.noscript { max-width: 40rem; margin: 6rem auto; padding: 2rem; border: 1px solid var(--rule-strong); text-align: center; font-family: var(--serif); }

/* ── 响应式 ─────────────────────────────────────────── */
@media (max-width: 1080px) {
  .cover__frame { aspect-ratio: 16 / 9; }
  .card, .card--s7, .card--s5 { grid-column: span 6; }
  .card--s12 { grid-column: span 12; }
  .card--push { margin-top: 2.5rem; }
}

@media (max-width: 860px) {
  .masthead__inner { grid-template-columns: 1fr auto; row-gap: .35rem; padding-block: .7rem; }
  .masthead__issue { display: none; }
  .cover__body { grid-template-columns: 1fr; gap: 1.75rem; }
  .cover__side { border-left: 0; border-top: 1px solid var(--rule); padding-left: 0; padding-top: 1.5rem; }
  .author__grid { grid-template-columns: 1fr; }
  .author__shot { max-width: 22rem; }
  .colophon__inner { grid-template-columns: 1fr; }
  .rail { position: static; }
}

@media (max-width: 680px) {
  body { font-size: 16px; }
  /* 真正的单列：12 轨在窄屏下会被 11 条列间距撑破，这里塌成一轨 */
  .grid { grid-template-columns: minmax(0, 1fr); gap: 3rem; }
  .card, .card--s7, .card--s5, .card--s12 { grid-column: 1 / -1; margin-top: 0; }
  .card--push { margin-top: 0; }
  .card--row { grid-template-columns: 1fr; gap: 1.15rem; }
  .card__shot, .card--row .card__shot { aspect-ratio: 4 / 3 !important; }
  .cover__frame { aspect-ratio: 4 / 3; }
  .cover__tag .eyebrow { font-size: .62rem; letter-spacing: .22em; }
  .search { margin-left: 0; width: 100%; }
  .search input { width: 100%; }
  .rail { gap: .85rem; }
  .prose figure.wide { margin-inline: calc(-1 * var(--gutter)); }
  .prose figure.wide .reading__hero { aspect-ratio: 3 / 2; }
  .nextprev .next { text-align: left; }
  .reading__hero { aspect-ratio: 3 / 2; }
  /* 触屏可点区域不小于 ~44px */
  .save { padding: .62rem 1.05rem; }
  .chip { padding: .58rem 1.05rem; }
  .tag { padding: .5rem .95rem; }
  .back { padding: .6rem 0; }
  .mailbtn { padding: .6rem .2rem; }
  .search input { padding-block: .65rem; }
  .card__foot { gap: .75rem; }
}

@media (max-width: 420px) {
  .masthead__inner { grid-template-columns: 1fr; justify-items: start; row-gap: .55rem; }
  .masthead__nav { flex-wrap: wrap; gap: .6rem 1.1rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: .01ms !important; animation-duration: .01ms !important; }
  .card__shot:hover img { transform: none; }
}