.os-hero {
    min-height: 50vh; display: flex; flex-direction: column; justify-content: center;
    align-items: center; text-align: center; padding: 100px 24px 48px;
    position: relative; overflow: hidden;
  }
  #particlesBg { position: absolute; top: 0; left: 0; width: 100%; height: 100%; z-index: 0; }
  .os-hero > * { position: relative; z-index: 1; }
  .os-hero h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.1; margin-bottom: 16px; letter-spacing: -0.03em; }
  .os-hero p { color: var(--text-secondary, #a1a1aa); font-size: 1.15rem; max-width: 640px; line-height: 1.6; }
  .os-section { padding: 56px 24px; max-width: 1100px; margin: 0 auto; }
  .os-section h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); font-weight: 700; margin-bottom: 16px; letter-spacing: -0.02em; }
  .os-section .section-sub { color: var(--text-secondary, #a1a1aa); font-size: 1.05rem; max-width: 600px; margin-bottom: 32px; line-height: 1.6; }
  .os-layers { display: flex; flex-direction: column; gap: 0; }
  .os-layer {
    background: var(--card-bg, rgba(255,255,255,0.03)); border: 1px solid var(--border, rgba(255,255,255,0.06));
    padding: 28px 24px; position: relative; transition: border-color 0.3s;
  }
  .os-layer:first-child { border-radius: 16px 16px 0 0; }
  .os-layer:last-child { border-radius: 0 0 16px 16px; }
  .os-layer:hover { border-color: var(--accent, #6366f1); }
  .os-layer-tag {
    display: inline-block; background: rgba(99,102,241,0.1); color: var(--accent, #6366f1);
    padding: 4px 12px; border-radius: 6px; font-size: 0.75rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 12px;
  }
  .os-layer h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 8px; }
  .os-layer p { color: var(--text-secondary, #a1a1aa); line-height: 1.7; max-width: 560px; font-size: 0.95rem; }
  .pipeline-flow { display: flex; align-items: stretch; gap: 0; overflow-x: auto; padding-bottom: 8px; }
  @media (max-width: 768px) { .pipeline-flow { flex-direction: column; } }
  .pipeline-step {
    flex: 1; background: var(--card-bg, rgba(255,255,255,0.03)); border: 1px solid var(--border, rgba(255,255,255,0.06));
    padding: 22px 16px; text-align: center; position: relative; transition: border-color 0.3s; min-width: 160px;
  }
  .pipeline-step:first-child { border-radius: 16px 0 0 16px; }
  .pipeline-step:last-child { border-radius: 0 16px 16px 0; }
  @media (max-width: 768px) {
    .pipeline-step:first-child { border-radius: 16px 16px 0 0; }
    .pipeline-step:last-child { border-radius: 0 0 16px 16px; }
  }
  .pipeline-step:hover { border-color: var(--accent, #6366f1); }
  .pipeline-step h4 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
  .pipeline-step p { color: var(--text-secondary, #a1a1aa); font-size: 0.85rem; line-height: 1.5; }
  .pipeline-step::after {
    content: '\2192'; position: absolute; right: -14px; top: 50%; transform: translateY(-50%);
    color: var(--accent, #6366f1); font-size: 1.2rem; font-weight: 700; z-index: 2;
  }
  .pipeline-step:last-child::after { content: none; }
  @media (max-width: 768px) {
    .pipeline-step::after { content: '\2193'; right: auto; bottom: -14px; top: auto; left: 50%; transform: translateX(-50%); }
  }
  .workflow-steps { display: grid; grid-template-columns: repeat(5, 1fr); gap: 16px; }
  @media (max-width: 1024px) { .workflow-steps { grid-template-columns: repeat(3, 1fr); } }
  @media (max-width: 640px) { .workflow-steps { grid-template-columns: 1fr; } }
  .workflow-step {
    background: var(--card-bg, rgba(255,255,255,0.03)); border: 1px solid var(--border, rgba(255,255,255,0.06));
    border-radius: 16px; padding: 20px 16px; text-align: center; transition: border-color 0.3s, transform 0.3s;
  }
  .workflow-step:hover { border-color: var(--accent, #6366f1); transform: translateY(-4px); }
  .step-num {
    display: inline-flex; align-items: center; justify-content: center;
    width: 36px; height: 36px; border-radius: 50%;
    background: linear-gradient(135deg, var(--accent, #6366f1), #a855f7);
    color: white; font-weight: 700; font-size: 0.9rem; margin-bottom: 12px;
  }
  .workflow-step h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 6px; }
  .workflow-step p { color: var(--text-secondary, #a1a1aa); font-size: 0.85rem; line-height: 1.5; }
  .vision-section {
    background: var(--card-bg, rgba(255,255,255,0.03)); border: 1px solid var(--border, rgba(255,255,255,0.06));
    border-radius: 20px; padding: 36px 32px; border-left: 3px solid var(--accent, #6366f1);
  }
  .vision-section h3 { font-size: 1.3rem; font-weight: 700; margin-bottom: 16px; }
  .vision-section p { color: var(--text-secondary, #a1a1aa); line-height: 1.8; max-width: 600px; font-size: 1.05rem; }
  .section-illust { display: flex; justify-content: center; margin-bottom: 12px; opacity: 0.45; }