<style>
  * { box-sizing: border-box; margin: 0; padding: 0; }
  body { font-family: 'Georgia', serif; background: #fafaf7; color: #1a1a18; line-height: 1.75; font-size: 15px; }
  
  .hero { background: #1a1a18; color: #f0ede4; padding: 3rem 2rem; text-align: center; }
  .hero h1 { font-size: 2rem; font-weight: 700; letter-spacing: -0.5px; margin-bottom: 0.5rem; }
  .hero .sub { color: #a8a49a; font-size: 0.95rem; }
  .hero .years { margin-top: 1rem; font-size: 0.85rem; color: #c8c4ba; }
  
  .toc { background: #fff; border: 1px solid #e0ddd6; border-radius: 10px; margin: 2rem auto; max-width: 900px; padding: 1.5rem 2rem; }
  .toc h2 { font-size: 1rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: #888; margin-bottom: 1rem; }
  .toc ul { list-style: none; display: grid; grid-template-columns: 1fr 1fr; gap: 0.3rem; }
  .toc a { color: #2a5ca8; text-decoration: none; font-size: 0.88rem; }
  .toc a:hover { text-decoration: underline; }

  .container { max-width: 900px; margin: 0 auto; padding: 1rem 2rem 4rem; }

  .unit { margin-bottom: 3.5rem; }
  .unit-header { background: #1a1a18; color: #f0ede4; border-radius: 8px 8px 0 0; padding: 1rem 1.5rem; }
  .unit-header h2 { font-size: 1.15rem; font-weight: 700; }
  .unit-header .unit-sub { font-size: 0.8rem; color: #a8a49a; margin-top: 0.2rem; }

  .question-block { border: 1px solid #e0ddd6; border-top: none; background: #fff; }
  .question-block:last-child { border-radius: 0 0 8px 8px; }
  
  .q-header { padding: 0.9rem 1.5rem; border-bottom: 1px solid #f0ede4; cursor: pointer; display: flex; flex-direction: column; gap: 0.5rem; background: #fafaf7; }
  .q-header:hover { background: #f5f2eb; }
  .q-title-row { display: flex; justify-content: space-between; align-items: flex-start; gap: 0.75rem; width: 100%; }
  .q-title { font-weight: 600; font-size: 0.92rem; flex: 1; min-width: 0; line-height: 1.5; }
  .chevron { font-size: 0.8rem; color: #888; flex-shrink: 0; margin-top: 2px; transition: transform 0.2s; }
  .q-header.open .chevron { transform: rotate(180deg); }
  .q-meta { display: flex; gap: 0.4rem; align-items: center; flex-wrap: wrap; }
  .badge { font-size: 0.72rem; padding: 2px 8px; border-radius: 20px; white-space: nowrap; font-family: 'Courier New', monospace; font-weight: 600; line-height: 1.6; }
  .badge-year { background: #e8f0fb; color: #2a5ca8; white-space: normal; word-break: break-word; }
  .badge-marks { background: #eaf3de; color: #3b6d11; }
  .badge-hot { background: #faeeda; color: #854f0b; }

  .q-body { display: none; padding: 1.5rem; border-top: 1px solid #e0ddd6; }
  .q-body.open { display: block; }

  .answer h4 { font-size: 0.9rem; font-weight: 700; margin: 1.2rem 0 0.4rem; color: #333; border-left: 3px solid #2a5ca8; padding-left: 0.6rem; }
  .answer h4:first-child { margin-top: 0; }
  .answer p { margin-bottom: 0.7rem; font-size: 0.9rem; }
  .answer ul, .answer ol { margin: 0.5rem 0 0.7rem 1.4rem; font-size: 0.9rem; }
  .answer li { margin-bottom: 0.3rem; }
  .answer table { width: 100%; border-collapse: collapse; margin: 0.8rem 0; font-size: 0.85rem; }
  .answer th { background: #f0ede4; padding: 6px 10px; text-align: left; font-weight: 600; border: 1px solid #d0cdc6; }
  .answer td { padding: 5px 10px; border: 1px solid #e0ddd6; vertical-align: top; }
  .answer tr:nth-child(even) td { background: #fafaf7; }
  
  pre { background: #1e1e1e; color: #d4d4d4; border-radius: 6px; padding: 1rem; font-size: 0.82rem; overflow-x: auto; margin: 0.7rem 0; line-height: 1.5; }
  code { font-family: 'Courier New', monospace; }
  pre .kw { color: #569cd6; }
  pre .cm { color: #6a9955; }
  pre .st { color: #ce9178; }
  pre .fn { color: #dcdcaa; }
  pre .nm { color: #b5cea8; }

  .flowchart { background: #f5f2eb; border: 1px solid #d8d4c8; border-radius: 6px; padding: 1rem; margin: 0.7rem 0; font-family: 'Courier New', monospace; font-size: 0.8rem; line-height: 1.8; text-align: center; }
  .algo { background: #f0f8ff; border: 1px solid #b5d4f4; border-radius: 6px; padding: 1rem; margin: 0.7rem 0; font-size: 0.88rem; }
  .algo-step { margin: 0.25rem 0; }
  .algo-step .step-num { display: inline-block; background: #2a5ca8; color: #fff; border-radius: 50%; width: 20px; height: 20px; text-align: center; line-height: 20px; font-size: 0.75rem; margin-right: 0.5rem; flex-shrink: 0; }
  
  .note { background: #faeeda; border-left: 3px solid #ef9f27; padding: 0.6rem 0.9rem; border-radius: 0 4px 4px 0; font-size: 0.85rem; margin: 0.7rem 0; }
  .tip { background: #eaf3de; border-left: 3px solid #639922; padding: 0.6rem 0.9rem; border-radius: 0 4px 4px 0; font-size: 0.85rem; margin: 0.7rem 0; }

  .repeated-label { font-size: 0.75rem; color: #854f0b; font-weight: 600; margin-bottom: 0.5rem; display: flex; align-items: center; gap: 0.3rem; }
  .repeated-label::before { content: '★'; }

  @media (max-width: 600px) {
    .toc ul { grid-template-columns: 1fr; }
    .hero h1 { font-size: 1.4rem; }
    .q-meta { gap: 0.3rem; }
  }


  .view-btn {
  display: inline-block;
  padding: 8px 16px;
  background: #2d2d2d;
  color: #fff;
  text-decoration: none;
  border-radius: 6px;
  transition: 0.3s;
}

.view-btn:hover {
  background: #444;
}
</style>