/* ─────────────────────────────────────────────
   Tearice Archive · 纸质档案风
   底色 #f4efe4 / 墨 #1f1b16 / 朱红 #b3372a
   ───────────────────────────────────────────── */

:root {
  --paper: #f4efe4;
  --paper-2: #efe8d9;
  --paper-3: #e7deca;
  --ink: #1f1b16;
  --ink-2: #4a4339;
  --ink-3: #6b6154;
  --rule: #d3c8b4;
  --rule-strong: #b3a58b;
  --seal: #b3372a;
  --seal-soft: #efd8d1;
  --dark: #211d18;
  --dark-ink: #efe7d8;
  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", Georgia, serif;
  --sans: "PingFang SC", "Noto Sans SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "SFMono-Regular", ui-monospace, "Cascadia Mono", Consolas, "Liberation Mono", monospace;
  --ease-paper: cubic-bezier(0.19, 1, 0.22, 1);
  --gutter: clamp(20px, 5vw, 64px);
  --max: 1180px;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.9;
  letter-spacing: 0.01em;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* 纸张纤维：极淡的噪点，不抢字 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.35;
  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' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
}

main, header, footer { position: relative; z-index: 1; }

a { color: inherit; }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 10px 16px;
  z-index: 100;
}
.skip:focus { left: 12px; top: 12px; }

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

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: rgba(31, 27, 22, 0.06);
  padding: 1px 5px;
  border-radius: 2px;
  overflow-wrap: anywhere;
}

/* ── 报头 ───────────────────────────────────── */
.masthead {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(244, 239, 228, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--rule);
}

.masthead-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 16px var(--gutter) 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
}

.wordmark-mark {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  background: var(--seal);
  color: var(--paper);
  font-family: var(--serif);
  font-size: 19px;
  line-height: 1;
  transform: rotate(-2deg);
}

.wordmark-text {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-2);
}
.wordmark-dot { color: var(--seal); margin: 0 4px; }

.nav {
  display: flex;
  gap: 26px;
  font-size: 14px;
}
.nav a {
  text-decoration: none;
  color: var(--ink-2);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color 0.2s, border-color 0.2s;
}
.nav a:hover { color: var(--ink); border-color: var(--seal); }

.masthead-rule {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter) 8px;
  display: flex;
  justify-content: space-between;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
}

/* ── 00 封面 ────────────────────────────────── */
.cover {
  position: relative;
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(48px, 9vw, 108px) var(--gutter) clamp(64px, 8vw, 110px);
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: clamp(16px, 3vw, 40px);
  min-height: calc(100svh - 96px);
  align-content: center;
}

.cover-ruler {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  font-family: var(--mono);
  font-size: 9.5px;
  color: var(--ink-3);
  border-right: 1px solid var(--rule);
  padding: 4px 0;
}
.cover-ruler span { position: relative; }
.cover-ruler span::after {
  content: "";
  position: absolute;
  right: -14px;
  top: 50%;
  width: 7px;
  height: 1px;
  background: var(--rule-strong);
}

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

.cover-kicker {
  margin: 0 0 18px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--seal);
  text-transform: uppercase;
}

.cover-title {
  margin: 0 0 28px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(42px, 8.6vw, 112px);
  line-height: 1.12;
  letter-spacing: 0.02em;
}
.cover-title .line {
  display: block;
  overflow: hidden;
  padding-bottom: 0.08em;
}
.cover-title .line > * { display: inline-block; }
.cover-title em {
  font-style: normal;
  position: relative;
  z-index: 0;
  white-space: nowrap;
}
.cover-title em::after {
  content: "";
  position: absolute;
  left: -0.04em;
  right: -0.04em;
  bottom: 0.08em;
  height: 0.32em;
  background: var(--seal);
  opacity: 0.16;
  z-index: -1;
}

.cover-lead {
  margin: 0 0 clamp(32px, 5vw, 56px);
  max-width: 28em;
  font-size: clamp(16px, 1.35vw, 18px);
  line-height: 2;
  color: var(--ink-2);
}

.cover-meta {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.meta-cell {
  padding: 12px 14px 14px 0;
}
.meta-cell + .meta-cell { padding-left: 14px; border-left: 1px solid var(--rule); }
.meta-label {
  display: block;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  margin-bottom: 4px;
}
.meta-value { display: block; font-size: 14px; }
.meta-live { display: flex; align-items: center; gap: 7px; }
.meta-live i {
  width: 7px; height: 7px;
  background: #2f7d5a;
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(47, 125, 90, 0.16);
  animation: pulse 2.6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.scroll-cue {
  position: absolute;
  left: var(--gutter);
  bottom: clamp(20px, 4vw, 40px);
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  text-decoration: none;
}
.scroll-arrow { animation: bob 2.4s ease-in-out infinite; }
@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(5px); }
}

/* ── 章节通用 ───────────────────────────────── */
.section {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(64px, 9vw, 120px) var(--gutter);
}

.section-head {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: baseline;
  gap: 16px;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 14px;
  margin-bottom: clamp(32px, 4vw, 52px);
}
.section-no {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--seal);
  letter-spacing: 0.1em;
}
.section-head h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 700;
  letter-spacing: 0.04em;
}
.section-en {
  justify-self: end;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.24em;
  color: var(--ink-3);
  text-transform: uppercase;
}

.section--tinted {
  background: var(--paper-2);
  max-width: none;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.section--tinted > * { max-width: var(--max); margin-left: auto; margin-right: auto; }
.section--tinted .section-head { max-width: var(--max); }

.section--dark {
  background: var(--dark);
  color: var(--dark-ink);
  max-width: none;
}
.section--dark > * { max-width: var(--max); margin-left: auto; margin-right: auto; }
.section--dark .section-head { border-color: rgba(239, 231, 216, 0.28); }
.section--dark .section-no { color: #d96b5c; }
.section--dark .section-en { color: rgba(239, 231, 216, 0.72); }

/* ── 01 档案卡片 ─────────────────────────────── */
.dossier-grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1fr;
  gap: 24px;
  align-items: stretch;
}

.file-card {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--rule-strong);
  padding: 30px 26px 26px;
  display: flex;
  flex-direction: column;
  min-width: 0;
  box-shadow: 3px 4px 0 rgba(31, 27, 22, 0.06);
}
.file-card--lead { background: var(--paper); box-shadow: 5px 6px 0 rgba(179, 55, 42, 0.14); }

.file-tab {
  position: absolute;
  top: -1px;
  right: 18px;
  transform: translateY(-100%);
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.14em;
  padding: 3px 9px;
}
.file-card--lead .file-tab { background: var(--seal); }

.file-title {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: clamp(21px, 2vw, 26px);
  font-weight: 700;
  line-height: 1.4;
}

.file-desc {
  margin: 0 0 22px;
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--ink-2);
}

.file-specs {
  margin: auto 0 22px;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--rule);
}
.file-specs > div {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  padding: 8px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 13px;
}
.file-specs dt { color: var(--ink-3); flex: 0 0 auto; }
.file-specs dd { margin: 0; text-align: right; overflow-wrap: anywhere; }

.file-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* 按钮：纸张上的一枚方块，按下有压印感 */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  font-size: 14px;
  text-decoration: none;
  border: 1px solid var(--ink);
  transition: transform 0.16s var(--ease-paper), background 0.16s, color 0.16s, box-shadow 0.16s;
  will-change: transform;
}
.btn-primary {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 3px 3px 0 rgba(31, 27, 22, 0.16);
}
.btn-primary:hover { background: var(--seal); border-color: var(--seal); }
.btn-primary:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 rgba(31, 27, 22, 0.16);
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--rule-strong);
}
.btn-ghost:hover { border-color: var(--ink); background: var(--paper-3); }
.btn-ghost:active { transform: translate(1px, 1px); }

/* ── 02 手册 ─────────────────────────────────── */
.manual-layout {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: start;
}

.manual-toc {
  position: sticky;
  top: 104px;
  font-size: 13.5px;
}
.toc-title {
  margin: 0 0 12px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  color: var(--ink-3);
}
.manual-toc ol { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--rule); }
.manual-toc li { border-bottom: 1px solid var(--rule); }
.manual-toc a {
  display: flex;
  gap: 10px;
  padding: 9px 2px;
  text-decoration: none;
  color: var(--ink-2);
  transition: color 0.18s, padding-left 0.18s;
}
.manual-toc a:hover { color: var(--seal); padding-left: 5px; }
.manual-toc a span {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--ink-3);
  padding-top: 2px;
}

.manual-steps { display: grid; gap: clamp(34px, 4vw, 52px); min-width: 0; }

.step { scroll-margin-top: 104px; }
.step-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin-bottom: 10px;
}
.step-no {
  font-family: var(--mono);
  font-size: 11px;
  color: var(--seal);
  border: 1px solid var(--seal);
  padding: 1px 6px;
  line-height: 1.5;
  flex: 0 0 auto;
}
.step h3 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(19px, 1.8vw, 23px);
  font-weight: 700;
}
.step p { margin: 0 0 12px; max-width: 38em; }
.aside { font-size: 13.5px; color: var(--ink-2); }

.code {
  margin: 0 0 8px;
  background: var(--dark);
  color: #e7dcc6;
  padding: 16px 18px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 12.5px;
  line-height: 1.85;
  border-left: 3px solid var(--seal);
  tab-size: 2;
}
.code code { background: none; padding: 0; font-size: inherit; }
.code .c { color: #8f8577; }

.checklist {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--rule);
  max-width: 38em;
}
.checklist li {
  position: relative;
  max-width: 36em;
  padding: 11px 0 11px 26px;
  border-bottom: 1px solid var(--rule);
  font-size: 14.5px;
  line-height: 1.85;
}
.checklist li::before {
  content: "✓";
  position: absolute;
  left: 2px;
  top: 11px;
  color: var(--seal);
  font-size: 13px;
}
.checklist b { font-weight: 600; }

.faq { border-top: 1px solid var(--rule); max-width: 38em; }
.faq details { border-bottom: 1px solid var(--rule); }
.faq summary {
  cursor: pointer;
  padding: 12px 26px 12px 0;
  font-size: 15px;
  list-style: none;
  position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 10px;
  font-family: var(--mono);
  color: var(--seal);
  transition: transform 0.22s var(--ease-paper);
}
.faq details[open] summary::after { transform: rotate(45deg); }
.faq p { margin: 0 0 14px; font-size: 14px; color: var(--ink-2); }

/* ── 03 日志 ─────────────────────────────────── */
.ledger {
  border: 1px solid var(--rule-strong);
  background: var(--paper);
}

.ledger-head,
.ledger-row {
  display: grid;
  grid-template-columns: 96px 92px minmax(0, 1fr) 128px;
  gap: 16px;
  align-items: baseline;
  padding: 0 20px;
}

.ledger-head {
  padding-top: 10px;
  padding-bottom: 10px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.18em;
}

.ledger-row {
  padding-top: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule);
  font-size: 14px;
  transition: background 0.2s;
}
.ledger-row:last-child { border-bottom: 0; }
.ledger-row:hover { background: var(--paper-2); }

.mono { font-family: var(--mono); font-size: 12.5px; color: var(--ink-2); }
.ledger-row > span:last-child { text-align: right; }

.tag {
  display: inline-block;
  font-style: normal;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  padding: 1px 6px;
  border: 1px solid var(--rule-strong);
  color: var(--ink-2);
  white-space: nowrap;
}
.tag-start { border-color: var(--ink); color: var(--ink); }
.tag-ok { border-color: #24614a; color: #24614a; }
.tag-miss { border-color: var(--seal); color: var(--seal); }

.ledger-note {
  margin: 14px 0 0;
  font-size: 12.5px;
  color: var(--ink-3);
}

/* ── 04 关于 ─────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: clamp(32px, 6vw, 90px);
  align-items: start;
}
.about-name {
  margin: 0 0 4px;
  font-family: var(--serif);
  font-size: clamp(38px, 5vw, 64px);
  line-height: 1.1;
  letter-spacing: 0.02em;
}
.about-role {
  margin: 0 0 22px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.2em;
  color: #d96b5c;
  text-transform: uppercase;
}
.about-text {
  margin: 0;
  max-width: 26em;
  color: rgba(239, 231, 216, 0.86);
  font-size: 16px;
}

.about-links { border-top: 1px solid rgba(239, 231, 216, 0.24); }
.about-links a {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 18px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(239, 231, 216, 0.24);
  text-decoration: none;
  transition: padding-left 0.2s var(--ease-paper), color 0.2s;
}
.about-links a:hover { padding-left: 8px; color: #f0a294; }
.link-label {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  color: rgba(239, 231, 216, 0.72);
}
.link-value { font-size: 15px; }

/* ── 页脚 ───────────────────────────────────── */
.colophon {
  border-top: 1px solid var(--rule);
  padding: 22px var(--gutter);
}
.colophon-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.1em;
  color: var(--ink-3);
}
.colophon-rule { flex: 1; height: 1px; background: var(--rule); }

/* ── 动效初始态 ───────────────────────────────
   滚动出场由 GSAP 用 fromTo 控制，CSS 不预隐藏，
   保证无 JS、整页截图与减少动态效果时内容都可见。 */
.js .reveal { opacity: 0; }

/* ── 窄屏 ───────────────────────────────────── */
@media (max-width: 960px) {
  .dossier-grid { grid-template-columns: 1fr; }
  .manual-layout { grid-template-columns: 1fr; }
  .manual-toc { position: static; }
  .manual-toc ol { display: flex; flex-wrap: wrap; gap: 0 18px; border-top: 0; }
  .manual-toc li { border-bottom: 0; }
  .manual-toc a { padding: 6px 0; }
  .manual-toc a span { display: none; }
  .about-grid { grid-template-columns: 1fr; }
}

@media (max-width: 700px) {
  body { font-size: 16px; }
  .cover { grid-template-columns: 1fr; min-height: auto; padding-top: 44px; }
  .cover-ruler { display: none; }
  .cover-title { font-size: clamp(38px, 12vw, 64px); }
  .cover-meta { grid-template-columns: 1fr 1fr; }
  .meta-cell:nth-child(3) { border-left: 0; padding-left: 0; border-top: 1px solid var(--rule); }
  .meta-cell:nth-child(4) { border-top: 1px solid var(--rule); }
  .scroll-cue { display: none; }
  .nav { gap: 14px; font-size: 13px; }
  .masthead-inner { flex-wrap: wrap; gap: 10px; }
  .masthead-rule { font-size: 9px; }

  .ledger-head { display: none; }
  .ledger-row {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "time tag"
      "detail detail";
    gap: 3px 12px;
    padding: 13px 16px;
  }
  .ledger-row > span:nth-child(1) { grid-area: time; }
  .ledger-row > span:nth-child(2) { grid-area: tag; text-align: right; }
  .ledger-row > span:nth-child(3) { grid-area: detail; font-size: 13.5px; }
  .ledger-row > span:nth-child(4) { display: none; }
  .about-name { font-size: 44px; }
  .colophon-inner { flex-wrap: wrap; font-size: 9.5px; }
  .colophon-rule { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  .js .reveal,
  .js .cover-title .line > *,
  .js .cover-meta,
  .js .cover-lead,
  .js .cover-kicker { opacity: 1; transform: none; }
}

/* ── 下载与更新 ─────────────────────────────── */
.dl-meta {
  margin: 12px 0 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  color: var(--ink-3);
}
.dl-meta code { font-size: 10px; background: none; padding: 0; color: var(--ink-2); }
.dl-sep { opacity: 0.5; }
.dl-update {
  color: var(--seal);
  border: 1px solid var(--seal);
  padding: 0 5px;
  font-size: 9.5px;
  letter-spacing: 0.1em;
}

.updates-layout {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: clamp(32px, 5vw, 72px);
  align-items: start;
}

.updates-label {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.2em;
  color: var(--ink-3);
  text-transform: uppercase;
}

.updates-version {
  margin: 0 0 18px;
  font-family: var(--serif);
  font-size: clamp(34px, 4vw, 48px);
  line-height: 1.1;
  letter-spacing: 0.02em;
}

.updates-specs {
  margin: 0 0 22px;
  border-top: 1px solid var(--rule);
}
.updates-specs > div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 9px 0;
  border-bottom: 1px solid var(--rule);
  font-size: 13px;
}
.updates-specs dt { color: var(--ink-3); }
.updates-specs dd { margin: 0; text-align: right; }

.release-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.release { padding: 16px 0; border-bottom: 1px solid var(--rule); }
.release-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 6px;
}
.release-version {
  font-family: var(--mono);
  font-size: 13px;
  color: var(--ink);
}
.release-date {
  font-family: var(--mono);
  font-size: 10.5px;
  color: var(--ink-3);
  letter-spacing: 0.06em;
}
.release-notes {
  margin: 0;
  padding-left: 18px;
  font-size: 13.5px;
  color: var(--ink-2);
  line-height: 1.8;
}
.release-notes li { margin-bottom: 2px; }

.updates-note {
  margin: 14px 0 0;
  font-size: 12.5px;
  line-height: 1.8;
  color: var(--ink-3);
}

@media (max-width: 960px) {
  .updates-layout { grid-template-columns: 1fr; }
}