:root {
      color-scheme: light dark;
      --page: #eef4fd;
      --card: #ffffff;
      --card-soft: #f7fafd;
      --text: #182022;
      --muted: #46545a;
      --faint: #6d7d84;
      --line: #dde7f2;
      --line-strong: #c9d8ea;
      --title-blue: #0064d1;
      --title-blue-deep: #0053ad;
      --accent: #1f7a6d;
      --accent-deep: #146356;
      --accent-soft: #e7f3f0;
      --notice-bg: #eaf6ec;
      --notice-text: #1c5730;
      --notice-line: #a9d8b2;
      --warn-bg: #fdf3e3;
      --warn-text: #7a4d12;
      --warn-line: #ecc887;
      --shadow-card: 0 24px 60px rgba(31, 78, 140, .10), 0 4px 14px rgba(31, 78, 140, .06);
      --shadow-shot: 0 14px 34px rgba(24, 45, 66, .13);
      --focus: #0a8b7b;
    }
    @media (prefers-color-scheme: dark) {
      :root {
        --page: #0c1420;
        --card: #141f2e;
        --card-soft: #1a2839;
        --text: #f2f6f5;
        --muted: #c3d0cd;
        --faint: #93a5a0;
        --line: #2a3a4e;
        --line-strong: #3a4f6a;
        --title-blue: #6cb2ff;
        --title-blue-deep: #8fc2ff;
        --accent: #6fc7b8;
        --accent-deep: #93dccf;
        --accent-soft: #17322d;
        --notice-bg: #1c3324;
        --notice-text: #c9ecd1;
        --notice-line: #497a57;
        --warn-bg: #3a2d16;
        --warn-text: #f2d9a7;
        --warn-line: #7a5f2c;
        --shadow-card: 0 24px 60px rgba(0, 0, 0, .35);
        --shadow-shot: 0 14px 34px rgba(0, 0, 0, .4);
        --focus: #8bded2;
      }
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; background: var(--page); }
    body {
      margin: 0;
      min-width: 0;
      overflow-x: hidden;
      background: var(--page);
      color: var(--text);
      font-family: "SimHei", "黑体", "Heiti SC", "STHeiti", "Microsoft YaHei", "PingFang SC", sans-serif;
      font-size: 23px;
      line-height: 1.75;
      -webkit-font-smoothing: antialiased;
    }
    button, a { font: inherit; }
    a { color: inherit; }
    img { max-width: 100%; }
    :focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }
    .wrap { width: min(1120px, calc(100% - 48px)); margin-inline: auto; }

    /* ---------- 页眉 ---------- */
    .hero { padding: 52px 0 40px; }
    .hero-intro { min-width: 0; text-align: center; }
    .hero-creator {
      display: inline-flex;
      flex-wrap: wrap;
      justify-content: center;
      align-items: center;
      gap: 12px;
      max-width: 100%;
      margin: 0 0 30px;
      padding: 9px 26px 9px 18px;
      border: 1px solid var(--line-strong);
      border-radius: 999px;
      background: var(--card);
      box-shadow: 0 6px 18px rgba(31, 78, 140, .08);
      color: var(--muted);
      font-size: 25px;
      font-weight: 600;
      line-height: 1.5;
    }
    .hero-avatar {
      width: 54px;
      height: 54px;
      border-radius: 50%;
      object-fit: cover;
      flex: 0 0 auto;
      border: 2px solid var(--accent);
      background: var(--card-soft);
    }
    .hero-creator strong {
      color: var(--accent-deep);
      font-size: 29px;
      font-weight: 700;
      letter-spacing: .01em;
    }
    .hero-title {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: center;
      gap: 18px;
      margin: 0;
      color: var(--title-blue);
      font-size: clamp(52px, 6.6vw, 76px);
      line-height: 1.22;
      letter-spacing: -.02em;
      font-weight: 700;
      text-wrap: balance;
    }
    .hero-logo-box {
      display: inline-grid;
      place-items: center;
      width: 88px;
      height: 88px;
      flex: 0 0 auto;
      border: 1px solid var(--line-strong);
      border-radius: 16px;
      background: #ffffff;
      box-shadow: 0 8px 20px rgba(31, 78, 140, .12);
    }
    .hero-logo { width: 58px; height: 58px; object-fit: contain; }
    .hero-title-text { white-space: nowrap; }
    .hero-title-note {
      flex: 0 0 100%;
      margin-top: 14px;
      text-align: right;
      color: var(--title-blue-deep);
      font-size: clamp(16px, 1.9vw, 22px);
      font-weight: 600;
      letter-spacing: 0;
      line-height: 1.55;
      opacity: .85;
    }
    .hero-subtitle {
      max-width: 720px;
      margin: 20px auto 0;
      color: var(--muted);
      font-size: 25px;
      line-height: 1.75;
    }
    /* ---------- 主卡片与布局 ---------- */
    .sheet {
      margin-bottom: 56px;
      border: 1px solid var(--line);
      border-radius: 20px;
      background: var(--card);
      box-shadow: var(--shadow-card);
    }
    .layout {
      display: grid;
      grid-template-columns: 232px minmax(0, 1fr);
      gap: 44px;
      padding: 44px 48px 52px;
    }
    .step-nav {
      position: sticky;
      top: 24px;
      align-self: start;
      padding: 20px 16px;
      border: 1px solid var(--line);
      border-radius: 14px;
      background: var(--card-soft);
    }
    .step-nav h2 {
      margin: 0 4px 12px;
      color: var(--faint);
      font-size: 20px;
      font-weight: 700;
      letter-spacing: .12em;
      line-height: 1.5;
    }
    .nav-list { display: grid; gap: 4px; }
    .nav-list a {
      display: flex;
      align-items: baseline;
      gap: 10px;
      min-height: 44px;
      padding: 8px 12px;
      border-radius: 9px;
      color: var(--muted);
      text-decoration: none;
      font-size: 21px;
      line-height: 1.55;
      transition: background-color .15s ease, color .15s ease;
    }
    .nav-list .nav-num {
      flex: 0 0 auto;
      color: var(--accent);
      font-size: 18px;
      font-weight: 700;
    }
    .nav-list a:hover,
    .nav-list a:focus-visible {
      background: var(--accent-soft);
      color: var(--accent-deep);
    }
    .content { min-width: 0; }

    /* ---------- 提醒条 ---------- */
    .notice {
      display: grid;
      grid-template-columns: 38px minmax(0, 1fr);
      gap: 13px;
      margin-bottom: 34px;
      padding: 16px 18px;
      border: 1px solid var(--notice-line);
      border-radius: 12px;
      background: var(--notice-bg);
      color: var(--notice-text);
    }
    .notice-icon {
      display: grid;
      place-items: center;
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: color-mix(in srgb, currentColor 12%, transparent);
    }
    .notice strong { display: block; margin-bottom: 2px; font-size: 21px; }
    .notice p { margin: 0; font-size: 19px; line-height: 1.65; }

    /* ---------- 步骤卡片 ---------- */
    .steps { counter-reset: guide; display: grid; gap: 28px; }
    .step {
      counter-increment: guide;
      position: relative;
      padding: 34px 36px 38px;
      border: 1px solid var(--line);
      border-radius: 16px;
      background: var(--card);
      scroll-margin-top: 22px;
    }
    .step::before {
      content: "";
      position: absolute;
      top: 0;
      bottom: 0;
      left: 66px;
      width: 2px;
      background: var(--line);
    }
    .step:last-child::before { display: none; }
    .step-heading {
      position: relative;
      display: grid;
      grid-template-columns: 60px minmax(0, 1fr);
      gap: 18px;
      align-items: center;
      margin-bottom: 14px;
    }
    .step-heading::before {
      content: "0" counter(guide);
      display: grid;
      place-items: center;
      width: 60px;
      height: 60px;
      border-radius: 50%;
      background: var(--accent);
      color: #ffffff;
      box-shadow: 0 6px 16px rgba(20, 99, 86, .28);
      font: 700 22px/1 "SimHei", "黑体", "Heiti SC", "STHeiti", "Microsoft YaHei", "PingFang SC", sans-serif;
    }
    @media (prefers-color-scheme: dark) {
      .step-heading::before { color: #0c1a17; }
    }
    .step-heading h2 {
      margin: 0;
      font-size: clamp(32px, 3.8vw, 38px);
      line-height: 1.35;
      letter-spacing: -.018em;
    }
    .step-body { position: relative; margin-left: 78px; }
    .step-copy {
      margin: 0 0 26px;
      color: var(--muted);
      font-size: 24px;
      line-height: 1.8;
    }
    .step-copy p { margin: 0; }
    .step-reminder {
      display: flex;
      gap: 10px;
      align-items: flex-start;
      margin: 20px 0 26px;
      padding: 14px 16px;
      border: 1px solid var(--warn-line);
      border-radius: 10px;
      background: var(--warn-bg);
      color: var(--warn-text);
      font-size: 22px;
      line-height: 1.65;
    }
    .step-reminder svg { flex: 0 0 auto; margin-top: 5px; }

    figure { margin: 0; }
    .visual-stack { display: grid; gap: 30px; }
    .shot {
      display: block;
      width: fit-content;
      max-width: 100%;
      margin-inline: auto;
      padding: 0;
      border: 0;
      background: transparent;
      color: inherit;
      cursor: zoom-in;
    }
    .shot img {
      display: block;
      width: auto;
      max-width: 100%;
      height: auto;
      border: 1px solid var(--line);
      border-radius: 10px;
      background: var(--card);
      box-shadow: var(--shadow-shot);
      transition: transform .18s ease, box-shadow .18s ease;
    }
    .shot:hover img,
    .shot:focus-visible img {
      transform: translateY(-2px);
      box-shadow: 0 20px 42px rgba(24, 45, 66, .18);
    }
    .shot-wide img { width: min(100%, 860px); }
    .shot-medium img { width: min(100%, 730px); }
    .shot-small img { width: min(100%, 660px); }
    figcaption {
      display: flex;
      align-items: flex-start;
      justify-content: center;
      gap: 8px;
      max-width: 680px;
      margin: 12px auto 0;
      color: var(--faint);
      font-size: 19px;
      line-height: 1.65;
      text-align: left;
    }
    figcaption svg { flex: 0 0 auto; margin-top: 5px; color: var(--accent); }

    /* ---------- 完成检查 ---------- */
    .completion {
      margin-top: 28px;
      padding: 28px 32px;
      border: 1px solid color-mix(in srgb, var(--accent) 38%, var(--line));
      border-radius: 16px;
      background: var(--accent-soft);
    }
    .completion h2 {
      display: flex;
      align-items: center;
      gap: 12px;
      margin: 0 0 14px;
      color: var(--accent-deep);
      font-size: 30px;
      line-height: 1.4;
    }
    .completion ul {
      display: grid;
      gap: 10px;
      margin: 0;
      padding: 0;
      list-style: none;
    }
    .completion li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      color: var(--text);
      font-size: 23px;
      line-height: 1.65;
    }
    .check-badge {
      display: grid;
      place-items: center;
      flex: 0 0 auto;
      width: 30px;
      height: 30px;
      margin-top: 4px;
      border-radius: 50%;
      background: var(--accent);
      color: #ffffff;
    }
    @media (prefers-color-scheme: dark) {
      .check-badge { color: #0c1a17; }
    }
    footer {
      padding: 0 0 44px;
      color: var(--faint);
      font-size: 19px;
      text-align: center;
    }

    /* ---------- 图片放大 ---------- */
    dialog {
      width: min(1180px, calc(100% - 28px));
      max-width: none;
      max-height: calc(100dvh - 28px);
      padding: 0;
      border: 1px solid var(--line);
      border-radius: 12px;
      background: var(--card);
      color: var(--text);
      box-shadow: 0 30px 100px rgba(0, 0, 0, .45);
      overflow: auto;
    }
    dialog::backdrop { background: rgba(6, 10, 10, .84); }
    .dialog-bar {
      position: sticky;
      top: 0;
      z-index: 2;
      display: flex;
      justify-content: flex-end;
      padding: 8px;
      border-bottom: 1px solid var(--line);
      background: var(--card);
    }
    .close {
      display: grid;
      place-items: center;
      width: 44px;
      height: 44px;
      padding: 0;
      border: 1px solid var(--line);
      border-radius: 50%;
      background: var(--card-soft);
      color: var(--text);
      cursor: pointer;
      font-size: 28px;
      line-height: 1;
    }
    .dialog-image {
      display: block;
      width: auto;
      max-width: 100%;
      height: auto;
      margin-inline: auto;
      background: var(--card);
    }

    /* ---------- 平板 ---------- */
    @media (max-width: 900px) {
      .hero { padding: 42px 0 32px; }
      .sheet { border-radius: 16px; }
      .layout { grid-template-columns: 1fr; gap: 26px; padding: 30px 26px 38px; }
      .step-nav { position: static; min-width: 0; padding: 14px; }
      .step-nav h2 { margin: 0 4px 10px; }
      .nav-list {
        display: flex;
        width: 100%;
        gap: 6px;
        overflow-x: auto;
        padding: 1px 1px 6px;
        overscroll-behavior-inline: contain;
        scrollbar-width: thin;
      }
      .nav-list a {
        flex: 0 0 auto;
        min-width: max-content;
        align-items: center;
        padding: 9px 14px;
        border: 1px solid var(--line);
        border-radius: 999px;
        background: var(--card);
      }
      .nav-list a:hover,
      .nav-list a:focus-visible { border-color: var(--accent); }
    }
    /* ---------- 手机 ---------- */
    @media (max-width: 680px) {
      .wrap { width: min(100% - 20px, 1120px); }
      .hero { padding: 28px 0 22px; }
      .hero-creator {
        flex-wrap: nowrap;
        gap: 8px;
        margin-bottom: 24px;
        padding: 7px 16px 7px 13px;
        font-size: clamp(17px, 4.8vw, 20px);
        white-space: nowrap;
      }
      .hero-avatar { width: 36px; height: 36px; border-width: 1.5px; }
      .hero-creator strong { font-size: clamp(18px, 5.3vw, 22px); white-space: nowrap; }
      .hero-title { gap: 10px; font-size: clamp(24px, 7.9vw, 50px); line-height: 1.3; }
      .hero-title-note { margin-top: 12px; font-size: 14px; line-height: 1.65; }
      .hero-logo-box { width: 54px; height: 54px; border-radius: 12px; }
      .hero-logo { width: 37px; height: 37px; }
      .hero-subtitle { margin-top: 14px; font-size: 18px; line-height: 1.7; }
      .sheet { margin-bottom: 40px; border-radius: 14px; }
      .layout { padding: 20px 10px 28px; gap: 22px; }
      .nav-list a { font-size: 18px; }
      .notice { grid-template-columns: 34px minmax(0, 1fr); gap: 10px; padding: 12px 12px; margin-bottom: 22px; border-radius: 10px; }
      .notice-icon { width: 34px; height: 34px; }
      .notice strong { font-size: 18px; }
      .notice p { font-size: 17px; line-height: 1.65; }
      .steps { gap: 20px; }
      .step { padding: 22px 10px 26px; border-radius: 14px; }
      .step::before { display: none; }
      .step-heading { grid-template-columns: 46px minmax(0, 1fr); gap: 12px; margin-bottom: 10px; }
      .step-heading::before { width: 46px; height: 46px; font-size: 18px; }
      .step-heading h2 { font-size: 26px; line-height: 1.4; }
      .step-body { margin-left: 0; }
      .step-copy { margin-bottom: 18px; font-size: 19px; line-height: 1.78; }
      .step-reminder { margin: 14px 0 18px; padding: 12px 14px; font-size: 18px; }
      .visual-stack { gap: 22px; }
      .shot { width: 100%; }
      .shot img { width: 100%; border-radius: 8px; }
      figcaption { margin-top: 10px; font-size: 16px; line-height: 1.6; }
      .completion { margin-top: 20px; padding: 20px 16px; }
      .completion h2 { font-size: 24px; }
      .completion li { font-size: 19px; }
      footer { font-size: 16px; }
      dialog { width: calc(100% - 16px); max-height: calc(100dvh - 16px); }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      .shot img { transition: none; }
    }
  
body { font-size:21px; }
.hero { padding-top:40px; }
.hero-creator { font-size:20px; margin-bottom:24px; }
.hero-creator strong { font-size:23px; }
.hero-creator a { text-decoration:none; }
.hero-title { font-size:clamp(34px,5.4vw,62px); gap:16px; }
.hero-title-text { white-space:normal; }
.hero-title-sub { flex:0 0 100%; font-size:clamp(23px,3vw,34px); color:var(--title-blue-deep); line-height:1.5; margin-top:4px; }
.hero-subtitle { font-size:21px; max-width:820px; }
.hero-logo-box { width:72px; height:72px; border-radius:18px; }
.hero-logo { width:48px; height:48px; }
.step-nav { max-height:calc(100dvh - 48px); overflow:auto; }
.nav-list a { font-size:18px; }
.step-heading h2 { font-size:28px; }
.step-copy p { overflow-wrap:anywhere; }
.preparation-list { padding-left:1.2em; margin:14px 0 0; }
.preparation-list li { margin:7px 0; }
.subnote { font-size:17px; color:var(--muted); margin:16px 0 0; }
.notice { display:block; scroll-margin-top:24px; }
.notice ul { font-size:20px; }
.official-note { margin:24px 0 36px; padding:20px 24px; border:1px solid var(--warn-line); border-radius:12px; background:var(--warn-bg); color:var(--warn-text); font-size:18px; line-height:1.85; }
.official-note p { margin:0; }
.official-note a,.sources a { text-underline-offset:3px; }
.code-row { display:flex; flex-wrap:wrap; align-items:center; gap:10px; margin:16px 0; padding:13px 16px; background:var(--card-soft); border:1px solid var(--line); border-radius:10px; }
.code-row code { font-size:18px; overflow-wrap:anywhere; }
.copy-code { margin-left:auto; padding:5px 14px; border:1px solid var(--line-strong); border-radius:8px; background:var(--card); color:var(--accent-deep); cursor:pointer; font-size:16px; }
.plan-link { display:inline-flex; gap:8px; align-items:center; text-decoration:none; border-radius:10px; padding:11px 18px; background:var(--accent-soft); border:1px solid var(--line-strong); color:var(--accent-deep); font-weight:700; font-size:18px; }
.sources { border-top:1px solid var(--line); margin-top:32px; padding-top:24px; color:var(--muted); font-size:16px; }
.sources h2 { color:var(--text); font-size:22px; margin:0 0 12px; }
.sources ul { padding-left:1.2em; }
.source-date { font-size:14px; color:var(--faint); }
.completion h2 { font-size:27px; }
.completion li { font-size:20px; }
footer { font-size:16px; }
@media(max-width:900px) { .step-nav { max-height:none; overflow:visible; } .nav-list a { font-size:17px; } }
@media(max-width:680px) { body { font-size:18px; } .hero { padding:28px 0; } .hero-creator { padding:8px 14px; gap:8px; font-size:15px; } .hero-creator strong { font-size:18px; } .hero-avatar { width:42px; height:42px; } .hero-title { font-size:35px; gap:12px; } .hero-logo-box { width:54px; height:54px; border-radius:13px; } .hero-logo { width:38px; height:38px; } .hero-title-sub { font-size:22px; } .hero-subtitle { font-size:17px; } .notice ul { font-size:17px; } .step-heading h2 { font-size:24px; } .official-note { padding:16px; font-size:16px; } .code-row { padding:11px; } .code-row code { font-size:15px; } .completion li { font-size:17px; } }