:root {
      --bg: #121214;
      --surface: #1a1a1e;
      --surface-2: #222228;
      --fg: #f0efec;
      --muted: #8e8e96;
      --border: color-mix(in oklch, var(--fg) 14%, transparent);
      --border-strong: color-mix(in oklch, var(--fg) 34%, transparent);
      --accent: #f04832;
      --on-accent: #121214;
      --font-display: 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
      --font-body: 'Microsoft YaHei', 'PingFang SC', 'Hiragino Sans GB', system-ui, sans-serif;
      --font-mono: ui-monospace, Consolas, 'Courier New', monospace;
      --gap-sm: 12px; --gap-md: 20px; --gap-lg: 32px; --gap-xl: 56px;
      --container: 1120px; --gutter: 28px;
    }
    *, *::before, *::after { box-sizing: border-box; }
    html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
    body { margin: 0; background: var(--bg); color: var(--fg); font-family: var(--font-body); font-size: 16px; line-height: 1.7; text-rendering: optimizeLegibility; -webkit-font-smoothing: antialiased; }
    a { color: inherit; text-decoration: none; }
    p { text-wrap: pretty; }
    h1, h2, h3 { text-wrap: balance; }
    :focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

    .container { max-width: var(--container); margin-inline: auto; padding-inline: var(--gutter); }
    .eyebrow { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.3em; color: var(--accent); margin: 0 0 var(--gap-sm); }
    .meta { font-family: var(--font-mono); font-size: 13px; color: var(--muted); letter-spacing: 0.04em; }

    .topnav { position: sticky; top: 0; z-index: 10; background: color-mix(in oklch, var(--bg) 92%, transparent); backdrop-filter: blur(10px); border-bottom: 2px solid var(--border-strong); }
    .topnav-inner { display: flex; align-items: center; justify-content: space-between; gap: var(--gap-md); min-height: 60px; flex-wrap: wrap; }
    .logo { display: inline-flex; align-items: center; background: var(--accent); color: var(--on-accent); font-family: var(--font-display); font-weight: 800; font-size: 17px; letter-spacing: 0.1em; padding: 18px 20px; }
    .topnav nav { display: flex; gap: clamp(10px, 2.2vw, 28px); flex-wrap: wrap; }
    .topnav nav a { font-size: 14.5px; font-weight: 600; color: var(--muted); padding: 18px 2px; border-bottom: 3px solid transparent; }
    .topnav nav a:hover { color: var(--fg); }
    .topnav nav a[aria-current="page"] { color: var(--fg); border-bottom-color: var(--accent); }
    .topnav nav a .no { font-family: var(--font-mono); font-size: 11px; color: var(--accent); margin-right: 5px; }

    .layout { display: grid; grid-template-columns: 1fr 320px; gap: var(--gap-xl); align-items: start; }

    /* ── article head：大编号压题 ── */
    .art-head { padding-block: clamp(40px, 6vw, 60px) 26px; border-bottom: 2px solid var(--border-strong); margin-bottom: 32px; }
    .art-head .big-no { font-family: var(--font-mono); font-size: clamp(48px, 7vw, 84px); font-weight: 700; color: var(--accent); line-height: 1; margin: 0 0 6px; }
    .art-head h1 { font-family: var(--font-display); font-weight: 900; font-size: clamp(28px, 4vw, 44px); line-height: 1.3; letter-spacing: 0.02em; margin: 0 0 16px; }
    .art-meta { display: flex; gap: 20px; flex-wrap: wrap; }

    .prose { max-width: 68ch; }
    .prose p { margin: 0 0 18px; line-height: 1.9; }
    .prose h2 { font-family: var(--font-display); font-weight: 900; font-size: 22px; letter-spacing: 0.03em; margin: 44px 0 16px; padding-top: 26px; border-top: 1px solid var(--border); }
    .prose h2:first-of-type { border-top: 0; padding-top: 4px; margin-top: 24px; }
    .prose h2 .h-no { font-family: var(--font-mono); font-size: 15px; color: var(--accent); margin-right: 10px; }
    .prose strong { color: var(--fg); font-weight: 700; }
    .prose .hl { color: var(--accent); font-weight: 700; }
    .prose ul { margin: 0 0 18px; padding-left: 22px; line-height: 1.9; }
    .prose li { margin-bottom: 6px; }
    .prose li::marker { color: var(--accent); }

    /* 硬框步骤块 */
    .steps { border: 2px solid var(--border-strong); margin: 24px 0; }
    .step { display: flex; gap: 18px; padding: 20px 22px; border-bottom: 1px solid var(--border); }
    .step:last-child { border-bottom: 0; }
    .step-no { font-family: var(--font-mono); font-size: 24px; font-weight: 700; color: var(--accent); flex: none; line-height: 1.2; }
    .step-body h3 { font-family: var(--font-display); font-weight: 800; font-size: 17px; margin: 0 0 6px; }
    .step-body p { margin: 0; color: var(--muted); font-size: 14.5px; line-height: 1.8; }

    .sum-panel { border: 2px solid var(--accent); margin: 28px 0; }
    .sum-title { padding: 11px 20px; background: var(--accent); color: var(--on-accent); font-family: var(--font-display); font-weight: 800; font-size: 15px; letter-spacing: 0.12em; }
    .sum-body { padding: 20px; color: var(--muted); font-size: 14.5px; line-height: 1.95; }

    .next-row { display: flex; align-items: baseline; gap: var(--gap-md); padding: 15px 4px; border-bottom: 1px solid var(--border); }
    .next-row .no { font-family: var(--font-mono); font-size: 14px; font-weight: 700; color: var(--muted); flex: none; }
    .next-row a { font-size: 15.5px; min-width: 0; }
    .next-row a:hover { color: var(--accent); }
    .next-row .d { font-family: var(--font-mono); font-size: 12px; color: var(--muted); margin-left: auto; flex: none; }
    .next-head { font-family: var(--font-display); font-weight: 900; font-size: 19px; letter-spacing: 0.08em; margin: 48px 0 4px; padding: 10px 16px; background: var(--surface-2); border-left: 6px solid var(--accent); }

    /* sidebar */
    .panel { border: 2px solid var(--border-strong); margin-bottom: 40px; }
    .panel-title { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 12px 18px; background: var(--surface-2); border-bottom: 2px solid var(--border-strong); }
    .panel-title h3 { font-family: var(--font-display); font-weight: 800; font-size: 15.5px; letter-spacing: 0.1em; margin: 0; }
    .panel-title h3::before { content: '▮ '; color: var(--accent); }
    .panel-title .more { font-family: var(--font-mono); font-size: 11.5px; color: var(--muted); }
    .panel-title .more:hover { color: var(--accent); }
    .panel-body { padding: 4px 18px; }
    .p-server { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; padding: 12px 0; border-bottom: 1px solid var(--border); font-size: 13.5px; }
    .p-server:last-child { border-bottom: 0; }
    .p-server .name { min-width: 0; }
    .p-server .st { display: inline-block; width: 8px; height: 8px; margin-right: 8px; transform: translateY(-1px); }
    .st-hot { background: var(--accent); }
    .st-ok { background: var(--ok); }
    .st-plan { background: var(--plan); }
    .p-server .t { font-family: var(--font-mono); font-size: 12px; color: var(--muted); flex: none; }
    .p-row { padding: 12px 0; border-bottom: 1px solid var(--border); font-size: 14px; line-height: 1.6; }
    .p-row:last-child { border-bottom: 0; }
    .p-row a:hover { color: var(--accent); }

    .pagefoot { border-top: 2px solid var(--border-strong); padding-block: var(--gap-xl); color: var(--muted); font-size: 13px; }

    @media (max-width: 920px) {
      .layout { grid-template-columns: 1fr; }
    }
    @media (max-width: 600px) {
      .topnav-inner { padding-block: 6px; }
      .logo { padding: 12px 14px; }
      .topnav nav a { padding-block: 10px; }
    }