/* ChatGPT中文指南 — ChatGPT-adjacent mint/teal aesthetic
   Soft mint accent, warm off-white surfaces, rounded-2xl cards.
   Unofficial; no OpenAI marks. No external fonts/deps. */

:root{
  --ink:#1f2a2e;
  --muted:#5c6b70;
  --faint:#839199;
  --line:#e6ebe9;
  --bg:#f4f7f6;
  --paper:#fffeff;
  --surface:#f7f9f8;
  --brand:#10a37f;
  --brand-dark:#0d8f6e;
  --brand-deeper:#0a7359;
  --brand-soft:#e6f6f1;
  --brand-line:#b8e6d5;
  --brand-glow:rgba(16,163,127,.18);
  --warm:#f0b429;
  --warm-soft:#fff8e8;
  --deep:#0f2a24;
  --chat-user:#10a37f;
  --chat-bot:#eceff1;
  --radius:18px;
  --radius-pill:999px;
  --read-width:46rem;
  --shadow:0 8px 28px rgba(15,42,36,.06);
  --shadow-hover:0 16px 40px rgba(16,163,127,.14);
  --shadow-soft:0 2px 12px rgba(15,42,36,.04);
  --green-dot:#22c55e;
  --orange-dot:#f59e0b;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Source Han Sans SC",sans-serif;
  line-height:1.85;
  color:var(--ink);
  background:var(--bg);
  font-size:16px;
}
::selection{background:#c6efe3;color:var(--deep)}
a{color:var(--brand-dark);text-decoration:none}
a:hover{color:var(--brand-deeper);text-decoration:underline;text-underline-offset:3px}
a:focus-visible,summary:focus-visible,.btn:focus-visible{
  outline:3px solid var(--brand);
  outline-offset:2px;
  border-radius:6px;
}
img,svg{max-width:100%;height:auto}
.skip{
  position:absolute;left:-9999px;top:0;
  background:var(--brand);color:#fff;
  padding:10px 16px;z-index:30;border-radius:0 0 8px 0;
}
.skip:focus{left:0;color:#fff}

/* ——— Header ——— */
header.top{
  background:rgba(255,254,255,.86);
  backdrop-filter:saturate(140%) blur(12px);
  -webkit-backdrop-filter:saturate(140%) blur(12px);
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 0 rgba(16,163,127,.05);
  position:sticky;top:0;z-index:10;
}
header.top::after{
  content:"";display:block;height:2px;
  background:linear-gradient(90deg,var(--brand),#5ecfb0,transparent 80%);
}
header.top .wrap{
  display:flex;flex-wrap:wrap;align-items:center;
  justify-content:space-between;gap:8px 18px;
  padding-top:11px;padding-bottom:11px;
}
.logo{
  display:inline-flex;align-items:center;gap:10px;
  font-weight:800;font-size:18px;color:var(--deep);letter-spacing:.01em;
}
.logo:hover{text-decoration:none;color:var(--deep)}
.logo-mark{
  display:inline-flex;width:34px;height:34px;flex:0 0 auto;
  border-radius:11px;
  background:linear-gradient(145deg,#10a37f 0%,#0d8f6e 100%);
  box-shadow:0 4px 12px rgba(16,163,127,.35);
  align-items:center;justify-content:center;
}
.logo-mark svg{width:20px;height:20px;display:block}
.logo-text{display:inline-flex;align-items:baseline;gap:0}
.logo-text span{color:var(--brand);font-weight:700;margin-left:1px}
nav.main{display:flex;flex-wrap:wrap;gap:2px}
nav.main a{
  color:#3a4a4e;font-size:14.5px;padding:6px 12px;
  border-radius:var(--radius-pill);
}
nav.main a:hover{
  background:var(--brand-soft);color:var(--brand-dark);text-decoration:none;
}
nav.main a[aria-current]{background:var(--brand);color:#fff}

.wrap{max-width:1080px;margin:0 auto;padding:0 22px}
main{padding-bottom:16px}
article.wrap,.crumb.wrap{max-width:var(--read-width)}
main p{margin:0 0 1em}
main li{margin:.35em 0}
main ul,main ol{padding-left:1.5em;margin:.4em 0 1.1em}

/* ——— Hero (asymmetric + orbs) ——— */
.hero{
  position:relative;overflow:hidden;
  background:
    radial-gradient(ellipse 70% 55% at 8% 12%,rgba(16,163,127,.16),transparent 55%),
    radial-gradient(ellipse 55% 50% at 92% 18%,rgba(94,207,176,.14),transparent 50%),
    radial-gradient(ellipse 40% 40% at 70% 90%,rgba(240,180,41,.08),transparent 55%),
    linear-gradient(168deg,#f0faf6 0%,var(--bg) 48%,#f8faf9 100%);
  border-bottom:1px solid var(--line);
  padding:52px 0 44px;
}
.hero::before,.hero::after{
  content:"";position:absolute;border-radius:50%;pointer-events:none;filter:blur(2px);
}
.hero::before{
  width:220px;height:220px;right:6%;top:-40px;
  background:radial-gradient(circle,rgba(16,163,127,.22),transparent 70%);
}
.hero::after{
  width:160px;height:160px;left:4%;bottom:-50px;
  background:radial-gradient(circle,rgba(94,207,176,.2),transparent 70%);
}
.hero-grid{
  display:grid;grid-template-columns:1.15fr .85fr;
  gap:36px;align-items:center;position:relative;z-index:1;
}
.hero-eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;font-weight:600;color:var(--brand-dark);
  background:rgba(255,255,255,.75);border:1px solid var(--brand-line);
  padding:5px 12px 5px 8px;border-radius:var(--radius-pill);
  margin:0 0 16px;box-shadow:var(--shadow-soft);
}
.hero-eyebrow .dot{
  width:8px;height:8px;border-radius:50%;background:var(--brand);
  box-shadow:0 0 0 3px var(--brand-soft);
}
.hero h1{
  font-size:clamp(28px,4.2vw,38px);line-height:1.28;
  margin:0 0 16px;color:var(--deep);font-weight:800;
  letter-spacing:-.02em;max-width:16em;
}
.hero .lede-hero{
  color:#44555a;font-size:17px;max-width:38em;margin:0 0 22px;line-height:1.75;
}
.hero-actions{display:flex;flex-wrap:wrap;gap:10px;margin:0 0 18px}
.hero-chips{display:flex;flex-wrap:wrap;gap:8px;margin:0}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(255,255,255,.8);border:1px solid var(--line);
  color:var(--muted);border-radius:var(--radius-pill);
  padding:5px 12px;font-size:12.5px;font-weight:500;
}
.chip::before{
  content:"";width:6px;height:6px;border-radius:50%;background:var(--brand);opacity:.7;
}

/* Chat preview panel in hero */
.hero-visual{position:relative;min-height:260px}
.chat-panel{
  background:rgba(255,255,255,.92);
  border:1px solid var(--line);
  border-radius:22px;
  padding:18px 16px 14px;
  box-shadow:var(--shadow),0 0 0 1px rgba(16,163,127,.04);
  transform:rotate(1.2deg);
  position:relative;
}
.chat-panel::before{
  content:"";position:absolute;inset:-8px -12px auto auto;
  width:48px;height:48px;border-radius:50%;
  background:radial-gradient(circle,rgba(16,163,127,.25),transparent 70%);
  z-index:0;
}
.chat-row{display:flex;gap:10px;margin:0 0 12px;align-items:flex-start}
.chat-row.user{justify-content:flex-end}
.chat-avatar{
  width:28px;height:28px;border-radius:9px;flex:0 0 auto;
  background:linear-gradient(145deg,var(--brand),var(--brand-dark));
  display:flex;align-items:center;justify-content:center;
}
.chat-avatar svg{width:14px;height:14px}
.chat-bubble{
  max-width:88%;padding:10px 14px;border-radius:16px;
  font-size:13.5px;line-height:1.55;color:var(--ink);
}
.chat-bubble.bot{
  background:var(--surface);border:1px solid var(--line);
  border-bottom-left-radius:6px;
}
.chat-bubble.me{
  background:linear-gradient(135deg,var(--brand),var(--brand-dark));
  color:#fff;border-bottom-right-radius:6px;
  box-shadow:0 4px 12px rgba(16,163,127,.28);
}
.chat-composer{
  display:flex;align-items:center;gap:8px;
  margin-top:6px;padding:8px 8px 8px 14px;
  background:var(--surface);border:1px solid var(--line);
  border-radius:var(--radius-pill);
}
.chat-composer > span:not(.chat-send){
  flex:1;font-size:13px;color:var(--faint);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
  min-width:0;
}
.chat-send{
  width:32px;height:32px;border-radius:50%;
  background:var(--brand);display:flex;align-items:center;justify-content:center;
  box-shadow:0 2px 8px rgba(16,163,127,.35);flex:0 0 auto;
}
.chat-send svg{width:14px;height:14px}

/* Buttons — pill / send-button feel */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--brand);color:#fff;
  padding:12px 22px;border-radius:var(--radius-pill);
  font-weight:600;font-size:15px;
  border:1px solid var(--brand);
  box-shadow:0 4px 16px rgba(16,163,127,.32);
  transition:transform .15s ease,box-shadow .15s ease,background .15s ease;
}
.btn:hover{
  background:var(--brand-dark);color:#fff;text-decoration:none;
  transform:translateY(-1px);
  box-shadow:0 6px 20px rgba(16,163,127,.4);
}
.btn.alt{
  background:#fff;color:var(--brand-dark);
  border-color:var(--brand-line);box-shadow:var(--shadow-soft);
}
.btn.alt:hover{background:var(--brand-soft);color:var(--brand-deeper)}
.tag{
  display:inline-block;background:var(--brand-soft);color:var(--brand-dark);
  border-radius:var(--radius-pill);padding:3px 12px;font-size:12px;
  margin:2px 4px 2px 0;font-weight:500;
}

h1{font-size:30px;line-height:1.4;margin:.5em 0 .4em;color:var(--deep)}
h2{
  font-size:22px;line-height:1.45;margin:1.95em 0 .65em;
  color:var(--deep);scroll-margin-top:80px;letter-spacing:-.01em;
}
article h2{padding-bottom:8px;border-bottom:1px solid var(--line)}
article h2::before{
  content:"";display:inline-block;width:8px;height:8px;border-radius:50%;
  background:linear-gradient(135deg,var(--brand),#5ecfb0);
  margin-right:10px;vertical-align:middle;transform:translateY(-1px);
  box-shadow:0 0 0 3px var(--brand-soft);
}
h3{font-size:17px;line-height:1.5;margin:1.4em 0 .4em;color:#243338}
.crumb{font-size:14px;color:var(--muted);padding:16px 0 0;line-height:1.6}
.crumb a{color:var(--muted)}
.crumb [aria-current]{color:#243338;font-weight:600}
.meta,.article-meta,.byline{color:var(--muted);font-size:14px}
.byline{border-bottom:1px solid var(--line);padding-bottom:12px;margin-bottom:4px}
.article-body{
  background:var(--paper);border:1px solid var(--line);
  border-radius:var(--radius);padding:8px 28px 22px;margin-top:16px;
  box-shadow:var(--shadow-soft);
}

.lede{
  background:linear-gradient(135deg,var(--brand-soft),#f0faf6);
  border:1px solid var(--brand-line);border-radius:14px;
  padding:14px 18px;margin:20px 0 8px;font-size:16px;display:flex;gap:12px;
}
.lede-label{
  flex:0 0 auto;font-weight:700;color:var(--brand-dark);
  font-size:12px;letter-spacing:.08em;padding-top:4px;text-transform:uppercase;
}
.lede p{margin:0}

.toc{
  background:var(--paper);border:1px solid var(--line);border-radius:14px;
  padding:14px 20px 10px;margin:18px 0 6px;box-shadow:var(--shadow-soft);
}
.toc-title{font-weight:700;margin:0 0 8px;font-size:15px;color:var(--deep)}
.toc ol{margin:0;padding-left:1.4em}
.toc li{margin:.28em 0}
.toc a{color:#3a4a4e}
.toc a.active{color:var(--brand-dark);font-weight:700}

/* ——— Cards ——— */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:18px;margin:20px 0}
.grid2{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:16px;margin:18px 0}
.card{
  position:relative;
  background:var(--paper);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:22px 20px 18px 22px;
  transition:box-shadow .2s ease,transform .2s ease,border-color .2s ease;
  box-shadow:var(--shadow-soft);
  overflow:hidden;
}
.card::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:4px;
  background:linear-gradient(180deg,var(--brand),#5ecfb0);
  border-radius:4px 0 0 4px;
  opacity:.85;
}
.card:hover,.card:focus-within{
  box-shadow:var(--shadow-hover);
  transform:translateY(-3px);
  border-color:var(--brand-line);
}
.card-ico{
  display:inline-flex;align-items:center;justify-content:center;
  width:40px;height:40px;border-radius:12px;
  background:var(--brand-soft);color:var(--brand-dark);
  margin:0 0 12px;box-shadow:inset 0 0 0 1px var(--brand-line);
}
.card-ico svg{width:20px;height:20px;display:block}
.card h3{margin:0 0 8px;font-size:17px}
.card h3 a{color:var(--deep)}
.card h3 a:hover{color:var(--brand-dark)}
.card p{margin:0 0 .7em;color:#44555a;font-size:15px}
.card .kw{font-size:12px;color:var(--faint)}
.card .card-more{
  font-size:13px;font-weight:600;color:var(--brand-dark);
  display:inline-flex;align-items:center;gap:4px;
}
.card .card-more::after{content:"→"}

.all-list{list-style:none;padding:0;margin:12px 0}
.all-list li{padding:8px 0;border-bottom:1px dashed var(--line);line-height:1.7}
.all-list li:last-child{border-bottom:0}

.table-wrap{
  overflow-x:auto;-webkit-overflow-scrolling:touch;
  margin:14px 0;border:1px solid var(--line);border-radius:12px;
}
table{width:100%;border-collapse:collapse;font-size:15px;line-height:1.65;background:#fff}
th,td{border-bottom:1px solid var(--line);padding:10px 14px;text-align:left;vertical-align:top}
th{background:var(--brand-soft);color:var(--deep);font-weight:700;white-space:nowrap}
tbody tr:nth-child(even) td{background:#f8fbfa}
article ol>li::marker{color:var(--brand);font-weight:700}

.prompt{
  background:#f7fbf9;border:1px dashed var(--brand-line);
  border-left:4px solid var(--brand);border-radius:12px;
  padding:14px 16px;margin:14px 0;
}
.prompt .prompt-head{margin:0 0 4px;color:var(--brand-dark);font-size:14px;font-weight:700}
.prompt p:last-child{margin:0;overflow-wrap:anywhere;white-space:pre-line}

.note{background:var(--warm-soft);border:1px solid #f5d78e;border-radius:12px;padding:12px 16px;margin:16px 0}
.ok{background:var(--brand-soft);border:1px solid var(--brand-line);border-radius:12px;padding:12px 16px;margin:16px 0}
.promo{margin-top:22px}
.promo-note{display:block;margin-top:6px;font-size:13px;color:var(--faint)}
details{
  border:1px solid var(--line);border-radius:14px;
  padding:12px 16px;margin:8px 0;background:var(--paper);
}
details[open]{background:#f7fbf9;border-color:var(--brand-line)}
details summary{cursor:pointer;font-weight:600;color:var(--deep)}
.related-list{list-style:none;padding:0}
.related-list li{padding:8px 0;border-bottom:1px dashed var(--line)}
.next-step{
  background:
    radial-gradient(ellipse 60% 80% at 100% 0%,rgba(16,163,127,.1),transparent 55%),
    var(--paper);
  border:1px solid var(--brand-line);
  border-radius:var(--radius);
  padding:22px 26px;margin:28px 0 10px;
  box-shadow:var(--shadow);
}
.next-step h2{border:0;margin:0 0 8px;padding:0}
.next-step h2::before{display:none}
.editor-note,.small{font-size:13px;color:var(--faint)}
.section-space{margin-top:40px}
.section-head{
  display:flex;align-items:baseline;justify-content:space-between;
  gap:12px;flex-wrap:wrap;margin:1.6em 0 .2em;
}
.section-head h2{margin:0}
.section-head .hint{font-size:13px;color:var(--faint)}

/* Footer */
footer{
  background:var(--deep);color:#a8c4bc;
  padding:40px 0 28px;margin-top:52px;font-size:14px;line-height:1.8;
}
footer a{color:#8fd9c0}
footer a:hover{color:#fff}
footer .cols{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:18px 28px}
footer strong{color:#fff}
footer .legal{
  border-top:1px solid rgba(255,255,255,.1);
  margin-top:22px;padding-top:14px;color:#7a9a90;
}

.progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:20;background:transparent}
.progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--brand),#5ecfb0)}

@media(max-width:860px){
  .hero-grid{grid-template-columns:1fr;gap:28px}
  .hero-visual{max-width:380px;margin:0 auto}
  .chat-panel{transform:none}
}
@media(max-width:640px){
  .wrap{padding:0 16px}
  nav.main{width:100%;overflow-x:auto;flex-wrap:nowrap;-webkit-overflow-scrolling:touch;padding-bottom:2px}
  nav.main a{white-space:nowrap;font-size:14px}
  .hero{padding:36px 0 28px}
  .hero h1{font-size:26px}
  h1{font-size:24px}
  h2{font-size:20px}
  .article-body{padding:4px 16px 14px;border-radius:14px}
  .btn{width:100%;text-align:center}
  .hero-actions .btn{width:auto;flex:1 1 auto}
  .lede{flex-direction:column;gap:6px}
  .toc ol{display:flex;gap:8px;overflow-x:auto;padding:2px 0 8px;list-style:none}
  .toc li{flex:0 0 auto;margin:0}
  .toc li a{
    display:inline-block;background:#fff;border:1px solid var(--line);
    border-radius:999px;padding:4px 12px;font-size:14px;white-space:nowrap;
  }
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *{transition:none!important}
}
@media print{
  header.top,footer,.toc,.skip,.progress,.hero-visual{display:none!important}
  body{background:#fff}
  .article-body{border:0;padding:0;box-shadow:none}
  a{color:#000;text-decoration:underline}
  .hero-grid{grid-template-columns:1fr}
}

/* ——— Calendar / updates (Tibo 28-day) — mint theme ——— */
.btn-pill{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:var(--brand);color:#fff;
  padding:12px 22px;border-radius:var(--radius-pill);
  font-weight:600;font-size:15px;
  border:1px solid var(--brand);
  box-shadow:0 4px 16px rgba(16,163,127,.32);
  transition:transform .15s ease,box-shadow .15s ease,background .15s ease;
  text-decoration:none;
}
.btn-pill:hover{background:var(--brand-dark);color:#fff;text-decoration:none}
.btn-pill .arr{font-size:12px;opacity:.85}
button.btn-pill{cursor:pointer;font:inherit}
.all-list{list-style:none;padding:0;margin:12px 0}
.all-list li{padding:8px 0;border-bottom:1px dashed var(--line);line-height:1.7}
.all-list li:last-child{border-bottom:0}
.cal-hero{padding:36px 0 20px}
.cal-hero .breadcrumb-soft{
  font-size:12.5px;color:var(--faint);margin:0 0 14px;letter-spacing:.04em;
}
.cal-hero h1{
  font-size:clamp(28px,4vw,40px);margin:0 0 12px;
  letter-spacing:-.03em;font-weight:700;
}
.cal-hero .lede-hero{color:var(--muted);max-width:38em;margin:0;font-size:15.5px}
.cal-layout{
  display:grid;grid-template-columns:minmax(280px,.95fr) 1.15fr;
  gap:24px;align-items:start;padding:8px 0 40px;
}
.cal-panel,.day-panel{
  background:var(--paper);border:1px solid var(--line);
  border-radius:16px;padding:20px;
  box-shadow:var(--shadow-soft);
}
.cal-panel-head{
  display:flex;align-items:flex-start;justify-content:space-between;
  gap:12px;margin:0 0 14px;
}
.cal-panel-head .eyebrow{
  font-size:11px;letter-spacing:.08em;color:var(--faint);
  font-weight:700;margin:0 0 4px;
}
.cal-panel-head h2{margin:0;font-size:20px;letter-spacing:-.02em}
.cal-status{
  font-size:12.5px;color:var(--muted);background:var(--surface);
  border:1px solid var(--line);border-radius:var(--radius-pill);
  padding:5px 10px;white-space:nowrap;
}
.cal-legend{
  display:flex;flex-wrap:wrap;gap:10px 14px;
  margin:0 0 16px;font-size:12.5px;color:var(--muted);
}
.cal-legend span{display:inline-flex;align-items:center;gap:6px}
.dot{width:8px;height:8px;border-radius:50%;display:inline-block}
.dot.green{background:var(--green-dot)}
.dot.orange{background:var(--orange-dot)}
.dot.gray{background:#c4c4cc}
.cal-grid{
  display:grid;grid-template-columns:repeat(5,1fr);gap:8px;
}
.cal-day{
  display:flex;flex-direction:column;gap:6px;
  border:1px solid var(--line);border-radius:10px;
  padding:10px 8px;min-height:64px;background:var(--paper);
  text-decoration:none;color:inherit;transition:border-color .15s ease,background .15s ease;
}
.cal-day:hover{border-color:var(--brand-line);text-decoration:none}
.cal-day .d-label{font-size:10px;color:var(--faint);font-weight:600;letter-spacing:.04em}
.cal-day .d-num{font-size:15px;font-weight:700}
.cal-day.filled{background:var(--brand-soft);border-color:var(--brand-line)}
.cal-day.announce{background:#fff7ed;border-color:#fed7aa}
.cal-day.selected{
  background:var(--brand);border-color:var(--brand);color:#fff;
}
.cal-day.selected .d-label,.cal-day.selected .d-num{color:#fff}
.cal-day.selected .dot{box-shadow:0 0 0 2px rgba(255,255,255,.35)}
.cal-day.pending{opacity:.55}
button.cal-day{
  font:inherit;cursor:pointer;width:100%;text-align:left;
  appearance:none;-webkit-appearance:none;
}
button.cal-day:focus-visible{outline:2px solid var(--brand);outline-offset:2px}
.day-panel .pill-tag.gray{
  background:#f4f4f5;color:#52525b;border-color:#e4e4e7;
}
.all-list button.list-day-btn{
  font:inherit;background:none;border:0;padding:0;margin:0;
  color:var(--ink);cursor:pointer;text-align:left;
}
.all-list button.list-day-btn:hover{text-decoration:underline}
.day-panel .day-meta{
  display:flex;align-items:center;gap:10px;flex-wrap:wrap;
  margin:0 0 12px;font-size:13px;color:var(--muted);
}
.day-panel .pill-tag{
  display:inline-flex;align-items:center;
  background:#fff7ed;color:#b45309;border:1px solid #fed7aa;
  border-radius:var(--radius-pill);padding:3px 10px;font-size:12px;font-weight:600;
}
.day-panel .pill-tag.green{
  background:var(--brand-soft);color:var(--brand-deeper);border-color:var(--brand-line);
}
.day-panel h2{margin:0 0 12px;font-size:clamp(20px,2.4vw,26px);border:0;padding:0}
.day-panel .demo-banner{
  background:var(--surface);border:1px dashed var(--line);
  border-radius:10px;padding:10px 12px;margin:0 0 16px;
  font-size:12.5px;color:var(--muted);
}
.day-panel h3{margin:1.2em 0 .4em;font-size:16px}
@media(max-width:960px){
  .cal-layout{grid-template-columns:1fr}
  .cal-grid{grid-template-columns:repeat(4,1fr)}
}
@media(max-width:640px){
  .cal-grid{grid-template-columns:repeat(4,1fr)}
  .cal-hero{padding:28px 0 12px}
}