/* 平台入口页：正式、端正的机关门户式版面。色值一律引门户的 paper-tokens.css。 */
* { box-sizing: border-box; }
html { font-size: 17px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--font-serif); line-height: 1.7; -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility; }
a { color: inherit; }
h1, h2, h3 { margin: 0; font-family: var(--font-serif); font-feature-settings: "palt"; line-height: 1.3; }
.skip-link { position: fixed; left: 1rem; top: -10rem; padding: .8rem 1.2rem; background: var(--ink); color: var(--paper); z-index: 100; font-family: var(--font-sans); letter-spacing: .1em; text-decoration: none; }
.skip-link:focus { top: 1rem; }

/* 页眉 */
.top { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
.top__bar { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; padding: .5rem 0; border-bottom: 1px solid var(--line); font-family: var(--font-sans); font-size: .78em; color: var(--ink-2); letter-spacing: .06em; }
.top__brand { display: flex; align-items: center; justify-content: center; gap: 1.4rem; padding: 2rem 0 1.4rem; text-align: center; }
.seal { display: grid; grid-template-columns: 1fr 1fr; width: 4em; height: 4em; background: var(--cinnabar); color: var(--paper); border-radius: 3px; box-shadow: inset 0 0 0 2px var(--paper), inset 0 0 0 3px var(--cinnabar); font-weight: 700; font-size: 1.1em; line-height: 1; place-items: center; padding: .3em; flex: none; }
.top__title { text-align: left; }
.top__full { margin: 0; font-family: var(--font-sans); font-size: .82em; letter-spacing: .3em; color: var(--ink-2); }
.top h1 { font-size: clamp(1.7em, 3.6vw, 2.5em); font-weight: 700; letter-spacing: .12em; margin: .15em 0; }
.top__sub { margin: 0; font-family: var(--font-sans); font-size: .8em; letter-spacing: .4em; color: var(--loess-deep); }
.top__nav { display: flex; justify-content: center; flex-wrap: wrap; background: var(--ink); }
.top__nav a { padding: .7rem 2.2rem; color: var(--paper); text-decoration: none; letter-spacing: .2em; font-size: .95em; }
.top__nav a:hover { background: var(--night-2); }

/* 山河 */
.shanhe { margin: 0; border-bottom: 1px solid var(--line); background: var(--paper-2); }
.shanhe img { display: block; width: 100%; height: clamp(9rem, 24vw, 20rem); object-fit: cover; object-position: center 68%; mix-blend-mode: multiply; filter: saturate(.8); }
.shanhe figcaption { max-width: var(--container); margin: 0 auto; padding: .45rem var(--gutter); font-family: var(--font-sans); font-size: .76em; color: var(--ink-2); letter-spacing: .12em; text-align: right; }

/* 板块 */
.blocks { max-width: var(--container); margin: 0 auto; padding: .5rem var(--gutter) 2.5rem; }
.block { padding: 2rem 0 1.8rem; border-bottom: 1px solid var(--line); scroll-margin-top: 1rem; }
.block__head { display: flex; align-items: baseline; gap: 1rem; border-bottom: 2px solid var(--rule); padding-bottom: .4rem; margin-bottom: .9rem; }
.block__head h2 { font-size: 1.5em; font-weight: 700; letter-spacing: .1em; padding-left: .7rem; border-left: .4rem solid var(--cinnabar); line-height: 1.1; }
.block__off { font-family: var(--font-sans); font-size: .76em; color: var(--ink-3); letter-spacing: .1em; }
.block__intro { margin: 0 0 1.1rem; color: var(--ink-2); max-width: 60rem; }
.block__sub { font-size: 1.05em; font-weight: 700; letter-spacing: .1em; margin: 1.4rem 0 .6rem; }
.block__cta { margin: 0 0 1.2rem; }
.primary { display: inline-block; padding: .6em 2.4em; background: var(--cinnabar); color: var(--paper); text-decoration: none; letter-spacing: .2em; }
.primary:hover { background: var(--loess-deep); }

.entries { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(13rem, 1fr)); gap: .6rem; }
.entries a { display: flex; flex-direction: column; gap: .15rem; padding: .75rem .95rem; background: var(--card); border: 1px solid var(--line); text-decoration: none; }
.entries a:hover { border-color: var(--loess); }
.entries strong { font-weight: 700; }
.entries span { font-family: var(--font-sans); font-size: .76em; color: var(--ink-3); }
.channels { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(10rem, 1fr)); gap: .45rem; }
.channels a { display: flex; justify-content: space-between; gap: .6rem; padding: .5rem .8rem; border: 1px solid var(--line); background: var(--card); text-decoration: none; }
.channels a span { font-family: var(--font-sans); font-size: .76em; color: var(--loess-deep); font-variant-numeric: tabular-nums; }
.channels__empty { color: var(--ink-3); font-family: var(--font-sans); font-size: .84em; grid-column: 1 / -1; }

.groups { display: grid; grid-template-columns: repeat(auto-fit, minmax(13rem, 1fr)); gap: 1rem 2rem; }
.group h3 { font-size: 1em; font-weight: 700; letter-spacing: .12em; border-bottom: 1px solid var(--line-2); padding-bottom: .3rem; margin-bottom: .4rem; }
.group ul { list-style: none; margin: 0; padding: 0; columns: 2; column-gap: 1.2rem; }
.group li { break-inside: avoid; padding: .18rem 0; }
.group a { text-decoration: none; }
.group a:hover { text-decoration: underline; text-underline-offset: .2em; }

.mini { display: grid; grid-template-columns: minmax(15rem, 20rem) 1fr; gap: 2rem; align-items: start; }
.qr__frame { background: var(--card); border: 1px solid var(--line); padding: .9rem; display: grid; place-items: center; aspect-ratio: 1; }
.qr__frame img { width: 100%; height: auto; display: block; }
.qr__empty { margin: 0; color: var(--ink-3); text-align: center; font-size: .9em; }
.qr__caption { margin: .6rem 0 0; text-align: center; font-family: var(--font-sans); font-size: .82em; letter-spacing: .14em; color: var(--ink-2); }
.mini__text p { margin: 0 0 .8rem; }
.mini__actions { display: flex; align-items: center; gap: 1rem; flex-wrap: wrap; }
.button { font: inherit; font-family: var(--font-sans); letter-spacing: .16em; padding: .5em 1.4em; background: var(--ink); color: var(--paper); border: 0; cursor: pointer; }
.button:hover { background: var(--loess-deep); }
.button[disabled] { background: var(--line-2); cursor: progress; }
.mini__state { font-family: var(--font-sans); font-size: .82em; color: var(--ink-2); }

.foot { max-width: var(--container); margin: 0 auto; padding: 1.4rem var(--gutter) 3rem; text-align: center; font-family: var(--font-sans); font-size: .8em; color: var(--ink-2); letter-spacing: .1em; }
.foot p { margin: .25rem 0; }
.foot__note { color: var(--ink-3); }

@media (max-width: 48rem) {
  html { font-size: 16px; }
  .top__brand { flex-direction: column; gap: .8rem; }
  .top__title { text-align: center; }
  .top__nav a { padding: .6rem 1.1rem; }
  .shanhe img { height: 8.5rem; }
  .mini { grid-template-columns: 1fr; }
  .qr { max-width: 18rem; margin: 0 auto; }
  .group ul { columns: 1; }
}

/* hidden 属性要压得过 .mini__actions 的 display:flex，否则公网模式藏不住「更新二维码」。 */
[hidden] { display: none !important; }