:root {
    --upseo-container: 1200px;
    --upseo-radius: 16px;
    --upseo-brand: #004A61;
    --upseo-brand-2: #007891;
    --upseo-bg: #f8f9fa;
    --upseo-text: #0f172a;
    --upseo-muted: #6b7280;
    --upseo-card: #ffffff;
    --upseo-ring: rgba(0,74,97,.18);
    --upseo-shadow: 0 10px 28px rgba(2,6,23,.10);
    --upseo-accent: #F4A261;
  }
  * { box-sizing: border-box; }
  html, body { height: 100%; }
  body {
    margin: 0;
    color: var(--upseo-text);
    line-height: 1.85;
    background: var(--upseo-bg);
    overflow-x: hidden;
  }
  a { color: var(--upseo-brand); text-decoration: none; }
  a:hover { text-decoration: underline; }
  .upseo-container { max-width: var(--upseo-container); margin-inline: auto; padding: 24px; }
  .upseo-fullbleed { position: relative; isolation: isolate; }
  .upseo-fullbleed::before {
    content: \"\";
    position: absolute;
    inset: 0;
    z-index: -1;
    background:
      radial-gradient(1200px 600px at 100% -10%, rgba(0,74,97,.12), transparent 60%),
      radial-gradient(800px 500px at -10% 110%, rgba(0,120,145,.10), transparent 60%),
      linear-gradient(180deg, #eaf3f5, #f8f9fa);
  }
  .upseo-progress {
    position: fixed;
    inset-inline: 0;
    top: 0;
    height: 4px;
    z-index: 9999;
    background: linear-gradient(90deg, var(--upseo-brand), var(--upseo-brand-2));
    transform-origin: 0 50%;
    transform: scaleX(0);
    box-shadow: 0 6px 20px rgba(0,74,97,.35);
  }
  .upseo-btn.accent {
    background: linear-gradient(135deg, var(--upseo-accent), #d68f50);
  }
  .upseo-topbar {
    position: sticky;
    top: 0;
    z-index: 999;
    backdrop-filter: saturate(180%) blur(10px);
    background: linear-gradient(180deg, rgba(255,255,255,.85), rgba(255,255,255,.65));
    border-bottom: 1px solid rgba(0,74,97,.12);
  }
  .upseo-nav {
    max-width: calc(var(--upseo-container) + 48px);
    margin: auto;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
  }
  .upseo-branding {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    letter-spacing: -.02em;
  }
  .upseo-badge {
    width: 36px;
    height: 36px;
    border-radius: 12px;
    background: conic-gradient(from 210deg, var(--upseo-brand), var(--upseo-brand-2));
    box-shadow: 0 8px 24px rgba(0,74,97,.35), inset 0 0 0 2px rgba(255,255,255,.5);
  }
  .upseo-hero {
    padding: 64px 0 24px;
    color: #06222a;
  }
  .upseo-hero .upseo-wrap {
    max-width: var(--upseo-container);
    margin: auto;
    padding: 0 24px;
    display: grid;
    gap: 16px;
  }
  .upseo-hero h1 {
    margin: 0;
    font-size: clamp(28px, 4.8vw, 48px);
    line-height: 1.25;
    letter-spacing: -.01em;
    text-wrap: balance;
  }
  .upseo-hero p {
    margin: 0;
    opacity: .9;
  }
  .upseo-pill {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    font-weight: 800;
    background: rgba(0,74,97,.08);
    border: 1px solid rgba(0,74,97,.18);
  }
  .upseo-features {
    margin-top: 16px;
    padding: 14px 0 6px;
    border-top: 1px solid rgba(0,74,97,.15);
    border-bottom: 1px solid rgba(0,74,97,.10);
  }
  .upseo-features .upseo-row {
    max-width: var(--upseo-container);
    margin: auto;
    padding: 0 24px;
    display: grid;
    grid-template-columns: repeat(6, minmax(0,1fr));
    gap: 10px;
  }
  .upseo-feat {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    border-radius: 12px;
    background: #ffffff;
    border: 1px solid rgba(0,74,97,.14);
    font-weight: 700;
    font-size: 14px;
    box-shadow: var(--upseo-shadow);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
  @media (max-width: 900px) {
    .upseo-features .upseo-row { grid-template-columns: repeat(3,1fr); }
    .upseo-card-banner { min-height: 180px; }
    .upseo-card-banner img { height: 180px; }
  }
  @media (max-width: 560px) {
    .upseo-features .upseo-row { grid-template-columns: repeat(2,1fr); }
    .upseo-card-banner { min-height: 160px; }
    .upseo-card-banner img { height: 160px; }
  }
  .upseo-courses {
    max-width: var(--upseo-container);
    margin: 20px auto 0;
    padding: 0 24px;
  }
  .upseo-courses-head {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 12px;
  }
  .upseo-courses-head h2 {
    margin: 0;
    font-size: clamp(22px, 3.2vw, 32px);
    background: linear-gradient(135deg, var(--upseo-brand), var(--upseo-brand-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  .upseo-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0,1fr));
    gap: 14px;
  }
  @media (max-width: 900px) { .upseo-grid { grid-template-columns: repeat(2,1fr); } }
  @media (max-width: 560px) { .upseo-grid { grid-template-columns: 1fr; } }
  .upseo-card {
    background: var(--upseo-card);
    border-radius: 14px;
    border: 1px solid rgba(0,74,97,.14);
    box-shadow: var(--upseo-shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }
  .upseo-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 32px rgba(0,74,97,.2);
    border-color: var(--upseo-brand);
  }
  .upseo-card-banner {
    min-height: 365px;
    background:
      linear-gradient(135deg, rgba(0,74,97,.12), rgba(0,120,145,.12)),
      radial-gradient(400px 160px at 20% 30%, rgba(0,74,97,.20), transparent 60%),
      radial-gradient(400px 200px at 90% 70%, rgba(0,120,145,.20), transparent 60%);
    border-bottom: 1px solid rgba(0,74,97,.12);
    position: relative;
    overflow: hidden;
  }
  .upseo-card-banner img {
    width: 100%;
    height: 365px;
    object-fit: cover;
    object-position: center;
    display: block;
    border: 2px solid rgba(255,255,255,.5);
    border-radius: 10px;
  }
  .upseo-card-body { padding: 14px; }
  .upseo-card h3 { margin: 0 0 6px 0; font-size: 18px; }
  .upseo-card p { margin: 0; color: var(--upseo-muted); font-size: 14px; }
  .upseo-card-actions { display: flex; gap: 8px; padding: 12px 14px 16px; }
  .upseo-btn {
    appearance: none;
    border: none;
    cursor: pointer;
    font-weight: 800;
    border-radius: 999px;
    padding: 10px 14px;
    background: linear-gradient(135deg, var(--upseo-brand), var(--upseo-brand-2));
    color: #fff;
    box-shadow: 0 10px 22px rgba(0,74,97,.28);
  }
  .upseo-btn.outline {
    background: #fff;
    color: var(--upseo-brand);
    border: 1px solid rgba(0,74,97,.3);
  }
  .upseo-btn:hover { transform: translateY(-1px); }
  .upseo-layout {
    max-width: var(--upseo-container);
    margin-inline: auto;
    padding: 24px;
    display: grid;
    grid-template-columns: 1fr;
    gap: 22px;
  }
  @media (min-width: 1100px) {
    .upseo-layout { grid-template-columns: 300px 1fr; }
    .upseo-toc { position: sticky; top: 90px; max-height: calc(100vh - 120px); overflow: auto; }
  }
  .upseo-cardbox {
    background: var(--upseo-card);
    border-radius: var(--upseo-radius);
    box-shadow: var(--upseo-shadow);
    border: 1px solid rgba(0,74,97,.12);
  }
  .upseo-toc { padding: 16px; }
  .upseo-toc h3 { margin: 0 0 8px 0; font-size: 15px; color: var(--upseo-muted); }
  .upseo-toc ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 4px; }
  .upseo-toc a {
    display: block;
    padding: 8px 10px;
    border-radius: 10px;
    color: var(--upseo-text);
    font-weight: 700;
    font-size: 14px;
    border: 1px solid transparent;
  }
  .upseo-toc a:hover {
    background: rgba(0,74,97,.06);
    border-color: rgba(0,74,97,.18);
  }
  .upseo-toc a:hover::before {
    content: \'→ \';
    color: var(--upseo-brand);
  }
  .upseo-toc .lvl-3 { padding-inline-start: 14px; font-weight: 600; }
  article.upseo-prose {
    background: var(--upseo-card);
    border-radius: var(--upseo-radius);
    box-shadow: var(--upseo-shadow);
    padding: 26px;
    border: 1px solid rgba(0,74,97,.12);
  }
  article.upseo-prose h1, article.upseo-prose h2, article.upseo-prose h3 {
    scroll-margin-top: 90px;
    letter-spacing: -.01em;
    background: linear-gradient(135deg, var(--upseo-brand), var(--upseo-brand-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
  article.upseo-prose h1 { font-size: clamp(24px, 3.6vw, 36px); }
  article.upseo-prose h2 { font-size: clamp(20px, 3vw, 30px); }
  article.upseo-prose h3 { font-size: clamp(18px, 2.2vw, 22px); }
  article.upseo-prose p { color: var(--upseo-text); font-size: 17px; margin: 14px 0; }
  article.upseo-prose img { max-width: 100%; height: auto; border-radius: 14px; box-shadow: var(--upseo-shadow); }
  article.upseo-prose ul { padding: 0 18px; display: grid; gap: 10px; }
  article.upseo-prose li {
    padding: 10px 12px;
    border-radius: 12px;
    background: linear-gradient(180deg, rgba(0,74,97,.06), transparent);
    border: 1px dashed rgba(0,74,97,.25);
  }
  .upseo-prose table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    overflow: hidden;
    border-radius: 12px;
    border: 1px solid rgba(0,74,97,.2);
  }
  .upseo-prose th, .upseo-prose td {
    padding: 12px;
    border-bottom: 1px solid rgba(0,74,97,.12);
  }
  .upseo-prose tr:last-child td { border-bottom: none; }
  .upseo-prose thead th { background: rgba(0,74,97,.08); text-align: center; }
  .upseo-backtop {
    position: fixed;
    inset-inline-end: 16px;
    bottom: 24px;
    width: 44px;
    height: 44px;
    border-radius: 999px;
    display: grid;
    place-items: center;
    border: 1px solid rgba(0,74,97,.35);
    background: #fff;
    box-shadow: var(--upseo-shadow);
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
    transition: .3s;
    z-index: 998;
  }
  .upseo-backtop.show { opacity: 1; pointer-events: auto; transform: translateY(0); }
  html { scroll-behavior: smooth; }
  @media (prefers-reduced-motion: reduce) {
    .upseo-btn, .upseo-backtop, .upseo-progress { transition: none !important; }
  }