:root {
    --bg:        #F5F7FB;
    --bg2:       #EBEEF5;
    --bg3:       #DDE2EE;
    --surface:   #FFFFFF;
    --border:    #D4D9E8;
    --text:      #1A1D28;
    --text2:     #4A5168;
    --text3:     #8A94A6;
    --accent:    #4C7CF4;
    --accent-bg: #EBF0FE;
    --accent-dk: #2E57CC;
    --tag-bg:    #E4EAF8;
    --tag-text:  #3659B8;
    --code-bg:   #EFF1F8;
  }
  @media (prefers-color-scheme: dark) {
    :root {
      --bg:        #0F1623;
      --bg2:       #141C2E;
      --bg3:       #1D2640;
      --surface:   #1A2238;
      --border:    #243050;
      --text:      #E8ECF4;
      --text2:     #9AA5BE;
      --text3:     #586480;
      --accent:    #5B8AF7;
      --accent-bg: #1A2744;
      --accent-dk: #7BA3FF;
      --tag-bg:    #1A2744;
      --tag-text:  #7BA3FF;
      --code-bg:   #141C2E;
    }
  }
  :root[data-theme="light"] {
    --bg:        #F5F7FB;
    --bg2:       #EBEEF5;
    --bg3:       #DDE2EE;
    --surface:   #FFFFFF;
    --border:    #D4D9E8;
    --text:      #1A1D28;
    --text2:     #4A5168;
    --text3:     #8A94A6;
    --accent:    #4C7CF4;
    --accent-bg: #EBF0FE;
    --accent-dk: #2E57CC;
    --tag-bg:    #E4EAF8;
    --tag-text:  #3659B8;
    --code-bg:   #EFF1F8;
  }
  :root[data-theme="dark"] {
    --bg:        #0F1623;
    --bg2:       #141C2E;
    --bg3:       #1D2640;
    --surface:   #1A2238;
    --border:    #243050;
    --text:      #E8ECF4;
    --text2:     #9AA5BE;
    --text3:     #586480;
    --accent:    #5B8AF7;
    --accent-bg: #1A2744;
    --accent-dk: #7BA3FF;
    --tag-bg:    #1A2744;
    --tag-text:  #7BA3FF;
    --code-bg:   #141C2E;
  }


  .hero-inner {
    max-width: 100%;
    margin: 0 auto;
  }
  .hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--accent);
    background: var(--accent-bg);
    border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
    padding: 4px 10px;
    border-radius: 4px;
    margin-bottom: 24px;
  }
  .hero-eyebrow::before {
    content: '';
    width: 6px; height: 6px;
    background: var(--accent);
    border-radius: 50%;
    display: block;
  }

  .hero-sub {
    font-size: 17px;
    color: var(--text2);
    line-height: 1.65;
    max-width: 100%;
    text-wrap: balance;
    margin-bottom: 32px;
  }
  .hero-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
  }
  .badge {
    font-size: 12px;
    font-weight: 500;
    color: var(--tag-text);
    background: var(--tag-bg);
    border-radius: 4px;
    padding: 4px 10px;
    letter-spacing: .01em;
  }

  /* ── 본문 공통 ── */
  .doc {
    max-width: 100%;
    margin: 0 auto;
    padding: 0 24px;
  }

  /* ── 섹션 구분 ── */
  .section {
    margin-top: 60px;
  }
  .section-label {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: .12em;
    text-transform: uppercase;
    color: var(--text3);
    margin-bottom: 20px;
  }
  .section-label::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
  }
  .section-title {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -.01em;
    color: var(--text);
    margin-bottom: 6px;
    text-wrap: balance;
  }
  .section-desc {
    font-size: 15px;
    color: var(--text2);
    margin-bottom: 28px;
    line-height: 1.65;
  }

  /* ── 주요특징 — 가로 강조 카드 ── */
  .highlight-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 2fr));
    gap: 14px;
  }
  .highlight-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 22px 20px;
  }
  .highlight-icon {
    font-size: 22px;
    margin-bottom: 10px;
    display: block;
  }
  .highlight-card h3 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 6px;
  }
  .highlight-card p {
    font-size: 14px;
    color: var(--text2);
    line-height: 1.6;
  }

  /* ── 주요기능 — 2열 목록 ── */
  .feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
  }
  .feature-item {
    padding: 20px 22px;
    border-bottom: 1px solid var(--border);
    border-right: 1px solid var(--border);
    background: var(--surface);
  }
  .feature-item:nth-child(even) { border-right: none; }
  .feature-item:nth-last-child(-n+2) { border-bottom: none; }
  .feature-item:nth-last-child(1):nth-child(odd) {
    border-bottom: none;
    grid-column: span 2;
  }
  .feature-item-head {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 6px;
  }
  .feature-dot {
    width: 6px; height: 6px;
    background: var(--accent);
    border-radius: 50%;
    flex-shrink: 0;
  }
  .feature-item h3 {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
  }
  .feature-item p {
    font-size: 15px;
    color: var(--text2);
    line-height: 1.6;
    padding-left: 14px;
  }

  /* ── 활용사례 ── */
  .case-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
  }
  .case-item {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 0;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    background: var(--surface);
  }
  .case-label {
    background: var(--bg2);
    border-right: 1px solid var(--border);
    padding: 18px 16px;
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
    display: flex;
    align-items: center;
    line-height: 1.35;
  }
  .case-body {
    padding: 18px 20px;
  }
  .case-body p {
    font-size: 15px;
    color: var(--text2);
    line-height: 1.65;
  }
  .case-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 10px;
  }
  .case-tag {
    font-size: 13px;
    font-weight: 500;
    color: var(--tag-text);
    background: var(--tag-bg);
    border-radius: 3px;
    padding: 2px 8px;
  }

  /* ── 개발환경 ── */
  .stack-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 2fr));
    gap: 14px;
    margin-bottom: 28px;
  }
  .stack-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 18px 18px 16px;
  }
  .stack-role {
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: .1em;
    text-transform: uppercase;
    color: var(--text3);
    margin-bottom: 8px;
  }
  .stack-name {
    font-size: 16px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
  }
  .stack-note {
    font-size: 14.5px;
    color: var(--text2);
    line-height: 1.5;
  }

  /* ── 설치 스니펫 ── */
  .install-block {
    background: var(--code-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
  }
  .install-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    border-bottom: 1px solid var(--border);
    background: var(--bg2);
  }
  .install-header span {
    font-size: 14px;
    font-weight: 600;
    color: var(--text3);
    letter-spacing: .05em;
    text-transform: uppercase;
  }
  .install-dots { display: flex; gap: 5px; }
  .install-dots i {
    display: block; width: 9px; height: 9px;
    border-radius: 50%; background: var(--border);
  }
  .install-code {
    padding: 18px 20px;
    font-size: 14px;
    color: var(--text2);
    line-height: 2;
    overflow-x: auto;
  }
  .install-code .cmd { color: var(--accent-dk); }
  :root[data-theme="dark"] .install-code .cmd,
  @media (prefers-color-scheme: dark) { .install-code .cmd { color: var(--accent-dk); } }
  .install-code .comment { color: var(--text3); }

  /* ── 하단 버전 정보 ── */
  .footer-note {
    margin-top: 56px;
    padding-top: 24px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
  }
  .footer-note p {
    font-size: 14.5px;
    color: var(--text3);
    line-height: 1.6;
  }
  .footer-note strong { color: var(--text2); font-weight: 600; }

  @media (max-width: 560px) {
    .feature-grid { grid-template-columns: 1fr; }
    .feature-item { border-right: none !important; }
    .feature-item:nth-last-child(-n+2) { border-bottom: 1px solid var(--border); }
    .feature-item:last-child { border-bottom: none !important; grid-column: auto; }
    .case-item { grid-template-columns: 1fr; }
    .case-label { border-right: none; border-bottom: 1px solid var(--border); }
    .footer-note { flex-direction: column; }
  }

  @media (prefers-reduced-motion: no-preference) {
    .highlight-card, .feature-item, .case-item, .stack-card {
      transition: border-color .15s;
    }
    .highlight-card:hover { border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
  }