:root {
  --iv-paper: #f3f8e6;
  --iv-ink: #233016;
  --iv-ink-soft: #4a5a3a;
  --iv-mag: #b8126a;
  --iv-mag-deep: #8f0d52;
  --iv-line: #d9e6b8;
  --iv-sub: #fbfdf5;
  --iv-r-l: 22px;
  --iv-r-s: 12px;
  --iv-latin: Candara, "Segoe UI", sans-serif;
  --iv-cjk: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --iv-wide: 1120px;
  --iv-read: 40em;
}

*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--iv-paper);
  color: var(--iv-ink);
  font-family: var(--iv-cjk);
  font-size: 16px;
  line-height: 1.75;
  overflow-wrap: break-word;
}

img { max-width: 100%; height: auto; }

a { color: var(--iv-mag); text-underline-offset: 3px; text-decoration-thickness: 1px; }
a:hover { color: var(--iv-mag-deep); text-decoration-thickness: 2px; }

:focus-visible { outline: 3px solid var(--iv-mag); outline-offset: 2px; border-radius: 4px; }

code { font-family: Consolas, "Courier New", monospace; font-size: .92em; background: var(--iv-sub); border: 1px solid var(--iv-line); border-radius: 6px; padding: 0 .3em; overflow-wrap: anywhere; }

.iv-skip {
  position: absolute; left: 12px; top: -80px; z-index: 10;
  display: inline-flex; align-items: center; min-height: 44px; padding: 0 16px;
  background: var(--iv-ink); color: var(--iv-paper); border-radius: var(--iv-r-s); text-decoration: none;
}
.iv-skip:focus { top: 8px; color: var(--iv-paper); }

.iv-top { border-bottom: 1px solid var(--iv-line); }
.iv-top-in {
  max-width: var(--iv-wide); margin: 0 auto; padding: 8px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.iv-brand { display: inline-flex; align-items: center; min-height: 44px; }
.iv-logo-svg { display: block; width: 118px; height: 34px; }
.iv-nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 2px; }
.iv-nav a {
  display: inline-flex; align-items: center; min-height: 44px; padding: 0 12px;
  color: var(--iv-ink); text-decoration: none; font-size: 15.5px; border-radius: var(--iv-r-s);
  border-bottom: 3px solid transparent;
}
.iv-nav a:hover { background: var(--iv-sub); color: var(--iv-ink); }
.iv-nav a[aria-current="page"] { border-bottom-color: var(--iv-mag); border-radius: var(--iv-r-s) var(--iv-r-s) 0 0; font-weight: 700; }

.iv-main { display: block; }

.iv-hero {
  max-width: var(--iv-wide); margin: 0 auto; padding: 48px 16px 56px;
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, .85fr); gap: 56px; align-items: start;
}
.iv-hero h1 {
  margin: 0 0 18px; font-size: 53px; line-height: 1.18; font-weight: 800; line-break: strict;
}
.iv-hero-lead { margin: 0 0 26px; font-size: 18px; color: var(--iv-ink-soft); max-width: 30em; }
.iv-pick {
  background: var(--iv-sub); border: 1px solid var(--iv-line); border-radius: var(--iv-r-s);
  padding: 16px 20px 18px; max-width: 34em;
}
.iv-pick-k { margin: 0 0 4px; font-size: 14px; color: var(--iv-mag); font-weight: 700; }
.iv-pick-t { margin: 0 0 6px; font-size: 19px; line-height: 1.45; font-weight: 700; }
.iv-pick-t a { color: var(--iv-ink); text-decoration-color: var(--iv-mag); }
.iv-pick-why { margin: 0; font-size: 15px; color: var(--iv-ink-soft); }

.iv-hero-side { display: grid; gap: 22px; }
.iv-qr { margin: 0; display: flex; align-items: center; gap: 16px; }
.iv-qr img { width: 112px; height: 112px; border-radius: var(--iv-r-s); border: 1px solid var(--iv-line); }
.iv-qr figcaption { font-size: 15px; font-weight: 700; line-height: 1.5; }
.iv-qr figcaption span { display: block; font-family: var(--iv-latin); font-weight: 400; font-size: 14px; color: var(--iv-ink-soft); overflow-wrap: anywhere; }

.iv-ma {
  background: var(--iv-sub); border: 2px solid var(--iv-ink); border-radius: var(--iv-r-l);
  box-shadow: 8px 8px 0 var(--iv-mag); padding: 18px 20px 16px;
}
.iv-ma-k { margin: 0; font-size: 14px; color: var(--iv-ink-soft); }
.iv-ma-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin: 2px 0 6px; flex-wrap: wrap; }
.iv-ma-code {
  font-family: var(--iv-latin); font-weight: 700; font-size: 44px; line-height: 1.1; letter-spacing: .04em;
  color: var(--iv-mag); background: none; border: 0; padding: 0; user-select: all; -webkit-user-select: all;
  font-variant-numeric: lining-nums tabular-nums;
}
.iv-copy {
  min-height: 44px; min-width: 88px; padding: 0 18px; border: 0; border-radius: var(--iv-r-s);
  background: var(--iv-ink); color: var(--iv-paper); font: 700 16px/1 var(--iv-cjk); cursor: pointer;
  transition: background-color .15s ease;
}
.iv-copy:hover { background: var(--iv-mag-deep); }
.iv-copy.iv-copied { background: var(--iv-mag); }
.iv-ma-gain { margin: 0 0 8px; font-size: 17px; font-weight: 700; line-height: 1.5; }
.iv-ma-gain sup, .iv-ma-foot sup { color: var(--iv-mag); font-weight: 700; }
.iv-ma-go {
  display: flex; align-items: center; justify-content: center; min-height: 48px; margin: 4px 0 8px;
  background: var(--iv-mag); color: #fff; border-radius: var(--iv-r-s); text-decoration: none; font-weight: 700;
}
.iv-ma-go:hover { background: var(--iv-mag-deep); color: #fff; }
.iv-ma-note { margin: 0 0 6px; font-size: 14px; line-height: 1.6; color: var(--iv-ink-soft); }
.iv-ma-foot { margin: 0; font-size: 13.5px; line-height: 1.55; color: var(--iv-ink-soft); }

.iv-home-body { max-width: var(--iv-wide); margin: 0 auto; padding: 0 16px 56px; }
.iv-blk, .iv-home-list {
  display: grid; grid-template-columns: 15rem minmax(0, var(--iv-read)); column-gap: 48px;
  border-top: 1px solid var(--iv-line); padding: 36px 0 28px;
}
.iv-blk > *, .iv-home-list > * { grid-column: 2; }
.iv-blk > h2, .iv-home-list > h2 {
  grid-column: 1; grid-row: 1 / span 20; margin: 0; font-size: 24px; line-height: 1.4; line-break: strict;
}
.iv-blk > p:first-of-type, .iv-blk > ul:first-child { margin-top: 0; }
.iv-blk ul { padding-left: 1.2em; }
.iv-blk li { margin-bottom: 10px; }
.iv-home-more { font-size: 15px; color: var(--iv-ink-soft); }

.iv-list { list-style: none; margin: 0; padding: 0; }
.iv-list-item { padding: 16px 0; border-bottom: 1px dashed var(--iv-line); }
.iv-list-item:first-child { padding-top: 0; }
.iv-list-item > a { font-size: 19px; font-weight: 700; color: var(--iv-ink); text-decoration-color: var(--iv-mag); line-height: 1.5; }
.iv-list-item p { margin: 6px 0 0; font-size: 15px; color: var(--iv-ink-soft); }
.iv-list-date { font-family: var(--iv-latin); font-variant-numeric: lining-nums; }

.iv-crumb { display: flex; flex-wrap: wrap; align-items: center; gap: 0 6px; font-size: 14px; color: var(--iv-ink-soft); margin-bottom: 8px; }
.iv-crumb a { display: inline-flex; align-items: center; min-height: 44px; padding: 0 2px; }

.iv-sec, .iv-desk, .iv-soso { max-width: calc(var(--iv-read) + 32px); margin: 0 auto; padding: 24px 16px 64px; }
.iv-sec-h1, .iv-desk-h1 { font-size: 53px; line-height: 1.2; margin: 4px 0 18px; font-weight: 800; line-break: strict; }
.iv-sec-intro { font-size: 16.5px; }
.iv-sec-count { font-size: 14px; color: var(--iv-ink-soft); border-top: 1px solid var(--iv-line); padding-top: 14px; }
.iv-desk-date { font-size: 14px; color: var(--iv-ink-soft); margin: -8px 0 24px; }
.iv-pages { display: flex; gap: 16px; align-items: center; margin-top: 24px; }
.iv-pages a { display: inline-flex; align-items: center; min-height: 44px; }

.iv-soso-form label { display: block; font-weight: 700; margin-bottom: 6px; }
.iv-soso-row { display: flex; gap: 8px; }
.iv-soso-row input {
  flex: 1; min-width: 0; min-height: 48px; padding: 0 14px; font: 16px var(--iv-cjk); color: var(--iv-ink);
  background: var(--iv-sub); border: 2px solid var(--iv-ink); border-radius: var(--iv-r-s);
}
.iv-soso-row button {
  min-height: 48px; padding: 0 20px; border: 0; border-radius: var(--iv-r-s); background: var(--iv-ink); color: var(--iv-paper);
  font: 700 16px var(--iv-cjk); cursor: pointer;
}
.iv-soso-state { font-size: 14px; color: var(--iv-ink-soft); }
.iv-soso-out { padding-left: 1.2em; }
.iv-soso-out li { margin-bottom: 14px; }
.iv-soso-out a { font-weight: 700; display: inline-flex; min-height: 44px; align-items: center; }
.iv-soso-out p { margin: 0; font-size: 15px; color: var(--iv-ink-soft); }

.iv-art { max-width: calc(var(--iv-read) + 32px); margin: 0 auto; padding: 24px 16px 64px; }
.iv-art-head h1 { font-size: 44px; line-height: 1.25; margin: 4px 0 14px; font-weight: 800; line-break: strict; }
.iv-h1seg { display: inline-block; max-width: 100%; line-break: strict; }
.iv-art-by { margin: 0 0 22px; font-size: 14px; color: var(--iv-ink-soft); }
.iv-cover { margin: 0 0 22px; }
.iv-cover img { display: block; width: 100%; border-radius: var(--iv-r-l); border: 1px solid var(--iv-line); }
.iv-cover figcaption { font-size: 13.5px; color: var(--iv-ink-soft); margin-top: 8px; }

.iv-toc { background: var(--iv-sub); border: 1px solid var(--iv-line); border-radius: var(--iv-r-s); margin: 0 0 30px; }
.iv-toc summary {
  list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between;
  min-height: 48px; padding: 0 16px; font-weight: 700;
}
.iv-toc summary::-webkit-details-marker { display: none; }
.iv-toc summary::after { content: "+"; font-family: var(--iv-latin); font-size: 24px; color: var(--iv-mag); line-height: 1; }
.iv-toc[open] summary::after { content: "\2212"; }
.iv-toc ol { margin: 0; padding: 0 16px 12px 2.4em; }
.iv-toc li { padding: 2px 0; }
.iv-toc a { display: inline-block; padding: 6px 0; color: var(--iv-ink); text-decoration-color: var(--iv-line); }

.iv-prose { font-size: 17px; line-height: 1.85; }
.iv-prose p { margin: 0 0 1.05em; }
.iv-prose h2 { font-size: 26px; line-height: 1.4; margin: 2.2em 0 .7em; padding-top: .8em; border-top: 2px solid var(--iv-ink); line-break: strict; scroll-margin-top: 12px; }
.iv-prose h3 { font-size: 20px; line-height: 1.45; margin: 1.8em 0 .5em; scroll-margin-top: 12px; }
.iv-prose ul, .iv-prose ol { padding-left: 1.3em; margin: 0 0 1.1em; }
.iv-prose li { margin-bottom: .5em; }
.iv-prose strong { color: var(--iv-ink); background: linear-gradient(transparent 62%, var(--iv-line) 62%); }
.iv-prose small { font-size: 13.5px; color: var(--iv-ink-soft); }

.iv-shot { margin: 26px auto 30px; max-width: 360px; }
.iv-shot img { display: block; width: 100%; border-radius: var(--iv-r-s); border: 1px solid var(--iv-line); background: #1e2329; }
.iv-shot figcaption { font-size: 13.5px; line-height: 1.6; color: var(--iv-ink-soft); margin-top: 8px; }

.iv-tablewrap { overflow-x: auto; margin: 0 0 1.4em; border: 1px solid var(--iv-line); border-radius: var(--iv-r-s); background: var(--iv-sub); }
.iv-table { border-collapse: collapse; width: 100%; min-width: 540px; font-size: 15px; line-height: 1.6; }
.iv-table th, .iv-table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--iv-line); vertical-align: top; }
.iv-table th { background: var(--iv-line); font-weight: 700; }
.iv-table tr:last-child td { border-bottom: 0; }

.iv-ma-wrap { margin: 28px 0 32px; }

.iv-faq { margin-top: 48px; }
.iv-faq h2 { font-size: 26px; margin: 0 0 8px; padding-top: .8em; border-top: 2px solid var(--iv-ink); }
.iv-qa { border-bottom: 1px dashed var(--iv-line); padding: 14px 0; }
.iv-qa h3 { font-size: 18px; line-height: 1.5; margin: 0 0 6px; }
.iv-qa p { margin: 0; font-size: 16px; }

.iv-art-end { margin-top: 40px; display: grid; gap: 20px; }
.iv-tags-k { margin: 0 0 8px; font-size: 14px; color: var(--iv-ink-soft); }
.iv-tags ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.iv-tags li span, .iv-tags li a { display: inline-flex; align-items: center; min-height: 36px; padding: 0 12px; border: 1px solid var(--iv-line); border-radius: var(--iv-r-s); background: var(--iv-sub); font-size: 14px; }
.iv-next { background: var(--iv-sub); border: 1px solid var(--iv-line); border-radius: var(--iv-r-s); padding: 14px 18px; font-size: 15px; }
.iv-next p { margin: 0 0 6px; }
.iv-next ul { margin: 0; padding-left: 1.2em; }
.iv-next li { margin: 4px 0; }

.iv-foot { border-top: 1px solid var(--iv-line); background: var(--iv-sub); margin-top: 24px; }
.iv-foot-in {
  max-width: var(--iv-wide); margin: 0 auto; padding: 32px 16px 12px;
  display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr); gap: 40px;
}
.iv-foot-id p { font-size: 14px; color: var(--iv-ink-soft); margin: 10px 0 0; max-width: 34em; }
.iv-foot-nav ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0 16px; }
.iv-foot-nav a { display: inline-flex; align-items: center; min-height: 44px; font-size: 15px; color: var(--iv-ink); }
.iv-foot-rss { margin: 8px 0 0; }
.iv-foot-rss a { color: var(--iv-mag); }
.iv-foot-year { max-width: var(--iv-wide); margin: 0 auto; padding: 8px 16px 28px; font-family: var(--iv-latin); font-variant-numeric: lining-nums; font-size: 14px; color: var(--iv-ink-soft); }

@media (max-width: 959px) {
  .iv-hero { grid-template-columns: minmax(0, 1fr); gap: 18px; padding: 20px 16px 36px; }
  .iv-qr { display: none; }
  .iv-blk, .iv-home-list { grid-template-columns: minmax(0, 1fr); }
  .iv-blk > h2, .iv-home-list > h2 { grid-column: 1; grid-row: auto; margin-bottom: 14px; }
  .iv-blk > *, .iv-home-list > * { grid-column: 1; }
  .iv-foot-in { grid-template-columns: minmax(0, 1fr); gap: 16px; }
}

@media (max-width: 640px) {
  .iv-top-in { padding: 6px 12px; }
  .iv-logo-svg { width: 96px; height: 28px; }
  .iv-nav a { padding: 0 8px; font-size: 15px; }
  .iv-hero h1 { font-size: 32px; line-height: 1.25; margin-bottom: 10px; }
  .iv-hero-lead { font-size: 15px; line-height: 1.65; margin-bottom: 14px; }
  .iv-pick { padding: 10px 14px 12px; }
  .iv-pick-k { font-size: 13px; }
  .iv-pick-t { font-size: 16.5px; margin-bottom: 2px; }
  .iv-pick-why { font-size: 14px; line-height: 1.55; }
  .iv-ma { box-shadow: 6px 6px 0 var(--iv-mag); padding: 12px 14px 12px; margin-right: 6px; }
  .iv-ma-code { font-size: 34px; }
  .iv-ma-gain { font-size: 15.5px; margin-bottom: 4px; }
  .iv-sec-h1, .iv-desk-h1 { font-size: 32px; }
  .iv-art-head h1 { font-size: 28px; }
  .iv-prose { font-size: 16px; }
  .iv-prose h2 { font-size: 22px; }
  .iv-prose h3 { font-size: 18px; }
  .iv-blk > h2, .iv-home-list > h2 { font-size: 21px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}