:root {
    --bg: #FFFFFF;
    --band: #F4F6FB;
    --surface: #FFFFFF;
    --ink: #0E1A33;
    --muted: #4B5670;
    --line: #E3E7EF;
    --primary: #2346D8;
    --primary-hover: #1B38B4;
    --on-primary: #FFFFFF;
    --mark: #D4F55A;
    --on-mark: #0E1A33;
    --bubble: #EEF2FB;
    --good: #1E8A55;
    --bad: #C2413A;
    --shadow: 0 1px 2px rgba(14, 26, 51, .06), 0 16px 40px -20px rgba(35, 70, 216, .28);
    --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
    --sans: "Commissioner", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
      color-scheme: dark;
      --bg: #0B1222;
      --band: #0F182C;
      --surface: #121C33;
      --ink: #E8EDF7;
      --muted: #A3AEC4;
      --line: #22304A;
      --primary: #8FA8FF;
      --primary-hover: #A9BCFF;
      --on-primary: #0B1222;
      --bubble: #1A2642;
      --good: #5CCB8E;
      --bad: #F08A82;
      --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 16px 40px -20px rgba(0, 0, 0, .6);
    }
  }
  :root[data-theme="dark"] {
    color-scheme: dark;
    --bg: #0B1222;
    --band: #0F182C;
    --surface: #121C33;
    --ink: #E8EDF7;
    --muted: #A3AEC4;
    --line: #22304A;
    --primary: #8FA8FF;
    --primary-hover: #A9BCFF;
    --on-primary: #0B1222;
    --bubble: #1A2642;
    --good: #5CCB8E;
    --bad: #F08A82;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 16px 40px -20px rgba(0, 0, 0, .6);
  }

  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
  body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font: 400 17px/1.65 var(--sans);
    -webkit-font-smoothing: antialiased;
  }
  .wrap { max-width: 1120px; margin-inline: auto; padding-inline: 20px; }
  a { color: var(--primary); }
  :focus-visible { outline: 2px solid var(--primary); outline-offset: 3px; border-radius: 4px; }

  h1, h2, h3 { font-family: var(--serif); font-weight: 600; text-wrap: balance; margin: 0; font-optical-sizing: auto; }
  h2 { font-size: clamp(1.75rem, 3.4vw, 2.6rem); line-height: 1.15; letter-spacing: -0.015em; }
  h3 { font-size: 1.22rem; line-height: 1.3; letter-spacing: -0.005em; }
  p { margin: 0; }
  .label { font: 600 14px/1.2 var(--sans); color: var(--primary); letter-spacing: 0.01em; }
  mark {
    color: var(--on-mark);
    background: linear-gradient(transparent 10%, var(--mark) 10%, var(--mark) 90%, transparent 90%) no-repeat 0 0 / 100% 100%;
    padding: 0 0.12em;
    margin: 0 -0.04em;
    -webkit-box-decoration-break: clone;
    box-decoration-break: clone;
    animation: sweep 0.9s cubic-bezier(.3,.7,.3,1) 0.35s both;
  }
  @keyframes sweep { from { background-size: 0% 100%; } to { background-size: 100% 100%; } }
  @media (prefers-reduced-motion: reduce) { mark { animation: none; } }

  /* Header */
  .top {
    position: sticky;
    top: env(safe-area-inset-top, 0px);
    z-index: 10;
    background: color-mix(in srgb, var(--bg) 90%, transparent);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
  }
  .top .wrap { display: flex; align-items: center; gap: 16px; min-height: 64px; }
  .navlink { font: 600 15px/1 var(--sans); color: var(--ink); text-decoration: none; padding: 8px 4px; }
  .navlink:hover, .navlink[aria-current="page"] { color: var(--primary); }
  .brand { font: 700 21px/1 var(--serif); letter-spacing: -0.01em; color: var(--ink); text-decoration: none; margin-right: auto; }
  .brand .hl { background: var(--mark); color: var(--on-mark); padding: 0 1px 0 3px; border-radius: 2px; }

  .btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    font: 600 15.5px/1.2 var(--sans);
    padding: 14px 22px; border-radius: 8px; border: 1px solid var(--primary);
    background: var(--primary); color: var(--on-primary); text-decoration: none; cursor: pointer;
    transition: background-color .15s ease, transform .15s ease;
  }
  .btn:hover { background: var(--primary-hover); border-color: var(--primary-hover); transform: translateY(-1px); }
  .btn[disabled] { opacity: .6; cursor: progress; transform: none; }
  .btn.ghost { background: var(--surface); color: var(--ink); border-color: var(--line); }
  .btn.ghost:hover { border-color: var(--muted); background: var(--surface); }
  .top .btn { padding: 9px 15px; font-size: 14px; }
  @media (max-width: 520px) { .top .btn { display: none; } }

  /* Hero */
  .hero { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; padding-block: 80px 88px; }
  .hero h1 { font-size: clamp(2.35rem, 5vw, 4rem); line-height: 1.06; letter-spacing: -0.025em; margin-block: 16px 22px; }
  .hero .sub { font-size: 1.15rem; color: var(--muted); max-width: 34em; }
  .hero .ctas { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
  .hero .note { margin-top: 18px; font-size: 15px; color: var(--muted); }
  .hero .note a { font-weight: 600; text-decoration: none; white-space: nowrap; }
  .hero .note a:hover { text-decoration: underline; }
  @media (max-width: 880px) { .hero { grid-template-columns: 1fr; gap: 40px; padding-block: 48px 56px; } }

  .answer {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 22px;
    display: grid; gap: 16px;
    font-size: 15px;
    box-shadow: var(--shadow);
  }
  .answer > .label { display: flex; align-items: center; gap: 8px; color: var(--muted); font-weight: 500; }
  .answer > .label::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--good); }
  .q {
    justify-self: end; max-width: 88%;
    background: var(--bubble); border-radius: 14px 14px 4px 14px;
    padding: 10px 14px;
  }
  .a { line-height: 1.65; }
  .cite, .src-n {
    display: inline-block; min-width: 18px; text-align: center;
    font: 600 11px/16px var(--sans); font-variant-numeric: tabular-nums;
    color: var(--primary); background: var(--bubble);
    border-radius: 4px; padding: 0 4px; margin-left: 3px; vertical-align: 2px;
  }
  .sources { border-top: 1px solid var(--line); padding-top: 12px; display: grid; gap: 8px; }
  .sources > .label { color: var(--muted); font-weight: 500; font-size: 13px; }
  .sources ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
  .sources li { display: flex; gap: 8px; align-items: baseline; font-size: 13.5px; line-height: 1.4; color: var(--muted); overflow-wrap: anywhere; }
  .sources li:first-child { color: var(--ink); font-weight: 500; }
  .sources .src-n { margin-left: 0; }

  /* Sections */
  section.block { padding-block: 88px; }
  section.band { background: var(--band); }
  .head { display: grid; gap: 12px; margin-bottom: 40px; max-width: 46rem; }
  .lede { color: var(--muted); max-width: 40em; font-size: 1.05rem; }

  .shift { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
  .shift .lede { color: var(--ink); font-size: 1.08rem; }
  .compare { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
  .panel { border: 1px solid var(--line); border-radius: 12px; padding: 20px; display: grid; gap: 14px; align-content: start; background: var(--surface); }
  .panel .label { color: var(--muted); }
  .panel p { font-size: 14.5px; color: var(--muted); }
  .bars { display: grid; gap: 7px; }
  .bars i { display: block; height: 6px; border-radius: 3px; background: var(--line); }
  .chips { display: flex; flex-wrap: wrap; gap: 6px; }
  .chips span { font: 600 12px/1 var(--sans); padding: 5px 8px; border-radius: 4px; background: var(--mark); color: var(--on-mark); }
  @media (max-width: 880px) { .shift { grid-template-columns: 1fr; gap: 32px; } }
  @media (max-width: 480px) { .compare { grid-template-columns: 1fr; } }

  .cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
  .card { border: 1px solid var(--line); border-radius: 12px; padding: 26px; display: grid; gap: 12px; align-content: start; background: var(--surface); }
  .card .tag {
    justify-self: start;
    font: 700 12.5px/1 var(--sans); letter-spacing: 0.06em;
    color: var(--primary); background: var(--bubble); padding: 6px 9px; border-radius: 5px;
  }
  .card p { color: var(--muted); font-size: 15.5px; }
  @media (max-width: 880px) { .cards { grid-template-columns: 1fr; } }

  .offer { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; align-items: stretch; }
  .plan { grid-template-rows: auto auto 1fr auto; gap: 18px; padding: 30px; }
  .plan.free { border: 2px solid var(--primary); box-shadow: var(--shadow); }
  .plan-top { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 8px 12px; }
  .plan .price { font: 600 1.45rem/1.2 var(--serif); }
  .plan h3 { font-size: 1.5rem; }
  .plan .btn { justify-self: start; }
  .ticks { list-style: none; margin: 0; padding: 0; display: grid; gap: 14px; align-content: start; }
  .ticks li { display: grid; grid-template-columns: 20px 1fr; gap: 10px; font-size: 15.5px; color: var(--muted); }
  .ticks li::before { content: "✓"; color: var(--good); font: 700 15px/1.6 var(--sans); }
  .ticks strong { color: var(--ink); font-weight: 600; }
  @media (max-width: 880px) { .offer { grid-template-columns: 1fr; } .plan { padding: 24px; } }

  .ex-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 24px; }
  .ex-tabs button {
    font: 600 14px/1 var(--sans); padding: 10px 15px; border-radius: 999px; cursor: pointer;
    border: 1px solid var(--line); background: var(--surface); color: var(--muted);
  }
  .ex-tabs button:hover { color: var(--ink); border-color: var(--muted); }
  .ex-tabs button[aria-selected="true"] { background: var(--ink); border-color: var(--ink); color: var(--bg); }
  .ask { display: flex; flex-wrap: wrap; align-items: baseline; gap: 8px 12px; margin-bottom: 16px; font-size: 1.1rem; font-weight: 500; }
  .ask .label { color: var(--muted); font-weight: 500; }
  .ba { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; align-items: stretch; }
  .ba .card { grid-template-rows: auto 1fr auto; }
  .ba .before { border-style: dashed; background: transparent; }
  .ba .before .label { color: var(--muted); }
  .ba .before .copy { color: var(--muted); }
  .ba .after { box-shadow: var(--shadow); }
  .ba .copy { display: grid; gap: 10px; align-content: start; font-size: 15.5px; }
  .ba .after .copy p { color: var(--ink); font-size: 15.5px; }
  .ba .after .copy p.mini { color: var(--muted); font-size: 14.5px; }
  .verdict { display: grid; grid-template-columns: 20px 1fr; gap: 8px; padding-top: 12px; border-top: 1px solid var(--line); }
  .ba .card p.verdict { color: var(--ink); font-size: 14px; }
  .verdict::before { font: 700 15px/1.4 var(--sans); }
  .verdict.yes::before { content: "✓"; color: var(--good); }
  .verdict.no::before { content: "×"; color: var(--bad); }
  .onreq { margin-top: 26px; display: flex; flex-wrap: wrap; gap: 6px 12px; color: var(--muted); font-size: 15.5px; }
  .onreq a { font-weight: 600; text-decoration: none; }
  .onreq a:hover { text-decoration: underline; }
  @media (max-width: 720px) { .ba { grid-template-columns: 1fr; } }

  .fit { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
  .fit ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
  .fit li { display: grid; grid-template-columns: 20px 1fr; gap: 10px; font-size: 15.5px; }
  .fit li::before { font: 700 15px/1.6 var(--sans); }
  .fit .yes li::before { content: "✓"; color: var(--good); }
  .fit .no li::before { content: "×"; color: var(--bad); }
  @media (max-width: 720px) { .fit { grid-template-columns: 1fr; } }

  .faq { display: grid; max-width: 48rem; border-top: 1px solid var(--line); }
  .faq details { border-bottom: 1px solid var(--line); }
  .faq summary {
    cursor: pointer; list-style: none;
    display: flex; justify-content: space-between; gap: 16px; align-items: baseline;
    padding-block: 20px; font-weight: 600; font-size: 1.08rem;
  }
  .faq summary::-webkit-details-marker { display: none; }
  .faq summary::after { content: "+"; font: 400 24px/1 var(--sans); color: var(--primary); transition: transform .2s; }
  .faq details[open] summary::after { transform: rotate(45deg); }
  .faq details p { padding-bottom: 22px; color: var(--muted); max-width: 40em; }

  .contact { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 56px; align-items: start; }
  .contact .head { margin-bottom: 0; }
  .mail { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 8px; font-size: 15px; color: var(--muted); }
  .mail code { font: 600 15px/1 var(--sans); color: var(--ink); background: var(--surface); border: 1px solid var(--line); padding: 8px 10px; border-radius: 6px; user-select: all; }
  .mail button { font: 600 13px/1 var(--sans); padding: 9px 11px; border-radius: 6px; border: 1px solid var(--line); background: transparent; color: var(--primary); cursor: pointer; }
  form { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 26px; display: grid; gap: 18px; box-shadow: var(--shadow); }
  .row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
  .field { display: grid; gap: 7px; }
  .field label { font-size: 14px; font-weight: 600; }
  input[type="text"], input[type="email"], input[type="url"], textarea {
    width: 100%; font: 400 16px/1.4 var(--sans); color: var(--ink);
    background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 12px 13px;
  }
  input:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: 0; border-color: transparent; }
  textarea { min-height: 130px; resize: vertical; }
  .check { display: flex; gap: 10px; align-items: flex-start; font-size: 15px; cursor: pointer; }
  .check input { width: 18px; height: 18px; margin-top: 3px; accent-color: var(--primary); flex: none; }
  .hp { position: absolute; left: -9999px; }
  .status { font-size: 15px; border-radius: 8px; padding: 12px 14px; }
  .status.ok { background: color-mix(in srgb, var(--good) 14%, transparent); }
  .status.err { background: color-mix(in srgb, var(--bad) 14%, transparent); }
  @media (max-width: 880px) { .contact { grid-template-columns: 1fr; gap: 32px; } }
  @media (max-width: 560px) { .row { grid-template-columns: 1fr; } form { padding: 18px; } }

  footer { border-top: 1px solid var(--line); padding-block: 28px 40px; font-size: 14px; color: var(--muted); }
  footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; }

  /* ——— Blog ——— */
  .page-head { padding-block: 64px 40px; display: grid; gap: 14px; max-width: 46rem; }
  .page-head h1 { font-size: clamp(2.2rem, 4.6vw, 3.4rem); line-height: 1.08; letter-spacing: -0.02em; }
  .posts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; padding-bottom: 88px; }
  .post-card { border: 1px solid var(--line); border-radius: 12px; padding: 26px; display: grid; gap: 10px; align-content: start; background: var(--surface); }
  .post-card .meta, .article-meta { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: 14px; color: var(--muted); }
  .post-card h2 { font-size: 1.4rem; line-height: 1.25; }
  .post-card h2 a { color: var(--ink); text-decoration: none; }
  .post-card h2 a:hover { color: var(--primary); }
  .post-card p { color: var(--muted); font-size: 15.5px; }
  .post-card .more { font-weight: 600; text-decoration: none; }
  .empty { border: 1px dashed var(--line); border-radius: 12px; padding: 32px; display: grid; gap: 14px; justify-items: start; max-width: 40rem; margin-bottom: 88px; background: var(--band); }
  .empty p { color: var(--muted); }
  @media (max-width: 720px) { .posts { grid-template-columns: 1fr; } }

  .crumbs { display: flex; flex-wrap: wrap; gap: 8px; font-size: 14px; color: var(--muted); }
  .crumbs a { color: var(--muted); text-decoration: none; }
  .crumbs a:hover { color: var(--primary); }
  .article-head { max-width: 46rem; margin-inline: auto; padding-block: 48px 8px; display: grid; gap: 16px; }
  .article-head h1 { font-size: clamp(2rem, 4.2vw, 3.1rem); line-height: 1.1; letter-spacing: -0.02em; }
  .article-head .dek { font-size: 1.2rem; color: var(--muted); }
  .article-body { max-width: 46rem; margin-inline: auto; padding-bottom: 72px; }
  .short-answer { background: var(--bubble); border-radius: 12px; padding: 22px 24px; margin-block: 28px 8px; display: grid; gap: 8px; }
  .short-answer p { font-size: 1.08rem; }
  .prose { font-size: 18px; line-height: 1.75; }
  .prose > * + * { margin-top: 1.1em; }
  .prose h2 { font-size: clamp(1.45rem, 2.6vw, 1.85rem); line-height: 1.2; margin-top: 2.2em; }
  .prose h3 { font-size: 1.25rem; margin-top: 1.8em; }
  .prose ul, .prose ol { padding-left: 1.3em; margin-bottom: 0; }
  .prose li + li { margin-top: .45em; }
  .prose blockquote { margin-inline: 0; padding-left: 20px; border-left: 3px solid var(--line); color: var(--muted); }
  .prose img { border-radius: 10px; }
  .prose .table-wrap { overflow-x: auto; }
  .prose table { width: 100%; border-collapse: collapse; font-size: 16px; }
  .prose th, .prose td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
  .prose th { background: var(--band); font-weight: 600; }
  .article-body .faq { margin-top: 12px; }
  .cta-box { margin-top: 56px; border: 1px solid var(--line); border-radius: 14px; padding: 28px; display: grid; gap: 12px; justify-items: start; background: var(--band); }
  .cta-box h2 { font-size: 1.5rem; }
  .cta-box p { color: var(--muted); }
  .posts:empty { display: none; }

  /* ——— Author ——— */
  .article-meta a { color: var(--muted); font-weight: 600; text-decoration: none; }
  .article-meta a:hover { color: var(--primary); }
  .avatar {
    width: 56px; height: 56px; border-radius: 50%; flex: none;
    display: grid; place-items: center;
    background: var(--ink); color: var(--bg); font: 700 20px/1 var(--serif);
    box-shadow: inset 0 -10px 0 -4px var(--mark);
  }
  .author-box { margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--line); display: flex; gap: 16px; align-items: flex-start; }
  .author-box div { display: grid; gap: 6px; min-width: 0; }
  .author-box p { color: var(--muted); font-size: 15.5px; }
  .author-box strong { color: var(--ink); }
  .author-head { display: flex; gap: 20px; align-items: center; }
  .author-head .avatar { width: 80px; height: 80px; font-size: 30px; }