/* ============================================================
   impl.css — 구현 가이드(C++/DirectX 11) 전용 스타일
   ../css/style.css 위에 얹어 코드 중심 레이아웃을 보강한다.
   ============================================================ */

/* 구현 페이지 상단 배지 */
.impl-badge {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #0b0d13;
  background: var(--accent2);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}

/* 상단 이동 바 (허브/개념가이드 링크) */
.impl-topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: center;
  font-size: 13px;
  padding: 10px 0 22px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
}
.impl-topbar a { color: var(--text-dim); text-decoration: none; }
.impl-topbar a:hover { color: var(--accent); }
.impl-topbar .sep { color: var(--border); }

/* "직접 구현하기" 링크 (개념 가이드 → 구현 페이지) */
.impl-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin: 16px 0;
  padding: 10px 16px;
  border: 1px solid var(--accent2);
  border-radius: 10px;
  color: var(--accent2);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: background 0.15s;
}
.impl-link:hover { background: rgba(126, 231, 135, 0.1); }
.impl-link::after { content: "→"; }

/* 코드 블록: 가로 스크롤, 파일명 헤더 지원 */
.code {
  margin: 18px 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  background: #0b0d13;
}
.code-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 7px 14px;
  background: #12151d;
  border-bottom: 1px solid var(--border);
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 12px;
  color: var(--text-dim);
}
.code-head .lang {
  color: var(--accent);
  font-weight: 700;
  text-transform: uppercase;
  font-size: 11px;
  letter-spacing: 0.05em;
}
.code pre {
  margin: 0;
  border: none;
  border-radius: 0;
  padding: 14px 16px;
  overflow-x: auto;
  line-height: 1.6;
  font-size: 13.5px;
}
.code pre code { color: #e6e8ee; }

/* 단독 pre 도 동일 톤 */
.content pre { line-height: 1.6; }

/* 구문 강조 토큰 색 (highlight.js가 부여) */
.tok-com  { color: #6a7488; font-style: italic; }   /* 주석 */
.tok-str  { color: #7ee787; }                        /* 문자열 */
.tok-num  { color: #ffd166; }                        /* 숫자 */
.tok-pre  { color: #c792ea; }                        /* 전처리기 #include 등 */
.tok-key  { color: #ff7b72; font-weight: 600; }      /* 키워드 */
.tok-type { color: #56d4dd; }                        /* 타입 */
.tok-fn   { color: #6ea8fe; }                        /* 함수 호출 */
.tok-bi   { color: #ffb86c; }                        /* 내장/D3D·DXGI 함수 */

/* 단계 번호 리스트 */
ol.steps { counter-reset: step; list-style: none; padding-left: 0; }
ol.steps > li {
  position: relative;
  padding: 6px 0 6px 40px;
  margin: 8px 0;
}
ol.steps > li::before {
  counter-increment: step;
  content: counter(step);
  position: absolute;
  left: 0; top: 6px;
  width: 26px; height: 26px;
  background: var(--accent);
  color: #0b0d13;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 13px;
}

/* 주의/함정/성능 콜아웃 */
.callout {
  border-left: 3px solid var(--accent4);
  background: rgba(255, 209, 102, 0.06);
  padding: 12px 16px;
  border-radius: 0 8px 8px 0;
  margin: 16px 0;
  font-size: 14px;
}
.callout.gotcha { border-left-color: var(--accent3); background: rgba(255, 123, 114, 0.07); }
.callout.perf   { border-left-color: var(--cyan, #56d4dd); background: rgba(86, 212, 221, 0.06); }
.callout .tag {
  display: inline-block;
  font-weight: 700;
  font-size: 12px;
  margin-right: 6px;
}
.callout.gotcha .tag { color: var(--accent3); }
.callout.perf .tag { color: #56d4dd; }
.callout .tag.warn { color: var(--accent4); }

/* 허브 카드 그리드 */
.hub-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 16px;
  margin: 24px 0;
}
.hub-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  text-decoration: none;
  color: var(--text);
  transition: border-color 0.15s, transform 0.15s;
}
.hub-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.hub-card .num {
  font-size: 12px;
  color: var(--accent);
  font-weight: 700;
  letter-spacing: 0.05em;
}
.hub-card h3 { margin: 4px 0 8px; color: var(--text); font-size: 18px; }
.hub-card p { margin: 0; font-size: 13px; color: var(--text-dim); }
.hub-card .topics { margin-top: 10px; font-size: 12px; color: var(--text-dim); }

/* 표: 개념→API 매핑 등 */
table.impl {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  margin: 16px 0;
}
table.impl th, table.impl td {
  text-align: left;
  padding: 9px 12px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
table.impl th { color: var(--accent); }
table.impl code { font-size: 0.86em; }

/* ── 실시간 WebGL 데모 (8장 잔디) ── */
.gdemo {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  background: #0a0f0d;
  margin: 18px 0 26px;
}
.gcanvas-wrap { position: relative; }
.gdemo canvas.gcanvas {
  display: block;
  width: 100%;
  height: 360px;
  background: #0a0f0d;
  touch-action: none;
  cursor: grab;
}
.gdemo canvas.gcanvas:active { cursor: grabbing; }
.gdemo .hud {
  position: absolute;
  top: 10px; left: 10px;
  font-family: "JetBrains Mono", Consolas, monospace;
  font-size: 12px;
  line-height: 1.5;
  color: var(--accent2);
  background: rgba(8, 12, 18, 0.72);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 10px;
  backdrop-filter: blur(4px);
  pointer-events: none;
}
.gdemo .gctrls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 20px;
  align-items: center;
  padding: 12px 15px;
  background: var(--bg-panel);
  border-top: 1px solid var(--border);
}
.gdemo .gctl {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 12px;
  color: var(--text-dim);
  min-width: 150px;
  flex: 1;
}
.gdemo .gctl label { display: flex; justify-content: space-between; gap: 8px; }
.gdemo .gctl .gval { color: var(--accent4); font-family: "JetBrains Mono", monospace; }
.gdemo .gctl input[type="range"] { width: 100%; accent-color: var(--accent); }
.gdemo .gbtns { display: flex; gap: 8px; flex-wrap: wrap; }
.gdemo .gbtns button {
  background: var(--bg-card);
  color: var(--text-dim);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 11px;
  font-size: 12px;
  font-weight: 600;
  cursor: pointer;
}
.gdemo .gbtns button.on {
  background: var(--accent2);
  color: #08120c;
  border-color: var(--accent2);
}
.gdemo .ghint {
  font-size: 12px;
  color: var(--text-dim);
  padding: 2px 15px 12px;
  background: var(--bg-panel);
}
.demo-caption { font-size: 13px; color: var(--text-dim); margin: 2px 0 0; }

/* 세부 페이지 하단 이전/다음 네비 */
.page-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  margin: 40px 0 8px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  font-size: 14px;
}
.page-nav a {
  color: var(--accent2);
  text-decoration: none;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  transition: border-color 0.15s, background 0.15s;
}
.page-nav a:hover { border-color: var(--accent2); background: rgba(126, 231, 135, 0.08); }
.page-nav a:only-child { margin-left: auto; }

/* 목차(오른쪽 고정) */
.page-toc {
  font-size: 13px;
}
.page-toc a { display: block; color: var(--text-dim); text-decoration: none; padding: 3px 0; }
.page-toc a:hover, .page-toc a.active { color: var(--accent); }