:root {
  --bg: #e4f3f7;
  --ink: #0f3d4c;
  --ink-soft: #3f6875;
  --ice: #8fd6e6;
  --frost: #ffffff;
  --pink: #e8456f;
  --lemon: #ffe066;
  --line: #bfe0e8;
  --sans: -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
  --round: "Yuanti SC", "YouYuan", "Arial Rounded MT Bold", -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c2630;
    --ink: #dff3f8;
    --ink-soft: #9fc6d1;
    --ice: #2e7f93;
    --frost: #133744;
    --pink: #ff7a9c;
    --lemon: #ffe27a;
    --line: #1f4b59;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; color: var(--ink); font: 16px/1.75 var(--sans);
  background: var(--bg);
  background-image: radial-gradient(circle at 12% 8%, var(--frost) 0 2px, transparent 3px),
                    radial-gradient(circle at 70% 30%, var(--frost) 0 1.5px, transparent 2.5px);
  background-size: 90px 90px, 130px 130px;
}
a { color: inherit; }
:focus-visible { outline: 3px solid var(--pink); outline-offset: 4px; }
.vh { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

.top, main, .foot { max-width: 1000px; margin: 0 auto; padding: 0 20px; }
.top { padding-top: 48px; padding-bottom: 28px; text-align: center; }
.site-name {
  text-wrap: balance; margin: 0; font-family: var(--round); font-weight: 800; line-height: 1.05; font-size: clamp(2.6rem, 11vw, 5.4rem); }
.site-name span { display: inline-block; }
.site-name span:first-child { transform: rotate(-3deg); }
.site-name span:last-child {
  transform: rotate(2deg); background: var(--lemon); color: #0f3d4c; padding: 0 .18em; border-radius: .18em; margin-left: .1em;
}
.lede { margin: 18px auto 0; max-width: 30em; color: var(--ink-soft); }

.daily { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 0.8fr); gap: 36px; align-items: center; padding: 12px 0 56px; }
.deck { perspective: 1200px; position: relative; }
.deck::before, .deck::after {
  content: ""; position: absolute; inset: 0; border-radius: 26px; background: var(--ice); z-index: -1;
}
.deck::before { transform: rotate(-4deg) translate(-6px, 6px); opacity: .6; }
.deck::after { transform: rotate(3deg) translate(8px, 4px); opacity: .35; }
.card {
  display: block; width: 100%; min-height: 300px; padding: 0; border: 0; background: none; cursor: pointer;
  position: relative; transform-style: preserve-3d; transition: transform .6s cubic-bezier(.3,1.4,.5,1);
  font: inherit; color: inherit; text-align: left;
}
.card.flipped { transform: rotateY(180deg); }
.face {
  position: absolute; inset: 0; border-radius: 26px; padding: 28px 28px 24px;
  display: flex; flex-direction: column; gap: 14px;
  backface-visibility: hidden; -webkit-backface-visibility: hidden;
  background: var(--frost); border: 3px solid var(--ink);
}
.back { transform: rotateY(180deg); background: var(--ink); color: var(--bg); }
.tag {
  align-self: flex-start; font-size: .85rem; font-weight: 700; padding: 2px 12px; border-radius: 999px;
  background: var(--pink); color: #fff;
}
.back .tag { background: var(--lemon); color: #0f3d4c; }
.fact { font-family: var(--round); font-weight: 800; font-size: clamp(1.4rem, 4.2vw, 2rem); line-height: 1.45; flex: 1; }
.why { font-size: 1.05rem; line-height: 1.85; }
.cold { align-self: flex-end; font-size: .9rem; color: var(--ink-soft); display: flex; gap: 4px; align-items: center; }
.cube { width: 14px; height: 14px; border-radius: 3px; background: var(--ice); border: 2px solid var(--ink); display: inline-block; }
.cube.off { background: transparent; opacity: .3; }

.side .tip { color: var(--ink-soft); margin: 0 0 18px; }
.row { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  font: 700 1rem/1 var(--sans); cursor: pointer; padding: 13px 22px; border-radius: 14px;
  border: 3px solid var(--ink); background: var(--pink); color: #fff;
  box-shadow: 4px 4px 0 var(--ink); transition: transform .1s, box-shadow .1s;
}
.btn:active { transform: translate(3px, 3px); box-shadow: 1px 1px 0 var(--ink); }
.btn.soft { background: var(--frost); color: var(--ink); }
.stat { margin: 20px 0 0; color: var(--ink-soft); }
.stat strong { color: var(--pink); font-size: 1.15em; }

h2 { font-family: var(--round); font-size: 1.7rem; margin: 0 0 14px; }
.shelf { padding-bottom: 48px; }
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.chip {
  font: inherit; cursor: pointer; padding: 4px 16px; border-radius: 999px;
  border: 2px solid var(--ink); background: transparent; color: var(--ink);
}
.chip[aria-pressed="true"] { background: var(--ink); color: var(--bg); }
.list { list-style: none; margin: 0; padding: 0; columns: 2 300px; column-gap: 20px; }
.list li {
  break-inside: avoid; margin: 0 0 16px; padding: 14px 18px; border-radius: 16px;
  background: var(--frost); border: 2px solid var(--line);
}
.list li button {
  all: unset; cursor: pointer; display: block; font-weight: 700; line-height: 1.6;
}
.list li button:focus-visible { outline: 3px solid var(--pink); outline-offset: 4px; border-radius: 4px; }
.list .k { font-size: .8rem; color: var(--pink); font-weight: 700; }
.list .w { margin: 6px 0 0; color: var(--ink-soft); font-size: .95rem; }

.foot { border-top: 2px dashed var(--line); padding-top: 18px; padding-bottom: 32px; color: var(--ink-soft); font-size: .9rem; text-align: center; }
.foot p { margin: 2px 0; }

@media (max-width: 760px) {
  .daily { grid-template-columns: 1fr; }
  .card { min-height: 280px; }
  .face { padding: 22px 20px 18px; }
}
@media (prefers-reduced-motion: reduce) {
  .card, .btn { transition: none; }
}