/* 🧻 와트만지 팔레트 — 「별과 정리」에서 그대로 가져왔다 (2026-08-27)
   ⛔ 손으로 고치지 마라. 원본은 연플래닝_행복수학/_배포_별과정리/003_아르키메데스의_묘비.html */
:root{
  /* 공식 팔레트 */
  --yeon-teal-primary:#6eb5a6; --yeon-teal-light:#b0cfc8; --yeon-mint-white:#e9f5f2;
  --yeon-gray-teal:#959e9c;    --yeon-deep-teal:#586e69;  --yeon-green-white:#ebf2ed;
  --yeon-light-gray:#ebebeb;   --yeon-sage-green:#dfe6d3; --yeon-warm-khaki:#dbd2a4;
  --yeon-tan-camel:#ad9d82;    --yeon-warm-beige:#d4cdc1; --yeon-soft-mauve:#b2a7b8;
  --yeon-dark-gray-purple:#615b63; --yeon-deep-green-black:#2a2e2c;
  --yeon-mid-sage:#697870;     --yeon-medium-gray:#c4c4c4;
  --yeon-deep-forest:#2b3b32;  --yeon-deep-navy:#37334f;
  /* 이 책이 쓰는 자리 */
  --bg:var(--yeon-warm-beige);          /* 책상 바닥 */
  --paper:#fff;                          /* 지면 바탕(위에 크림을 얹는다) */
  --ink:var(--yeon-deep-green-black);    /* 본문 */
  --ink2:var(--yeon-dark-gray-purple);   /* 보조 */
  --line:var(--yeon-medium-gray);        /* 얇은 선 */
  --rule:var(--yeon-tan-camel);          /* 괘선 · 장식 */
  --soft:var(--yeon-sage-green);         /* 부드러운 바탕 */
  --deep:var(--yeon-deep-green-black);   /* 차례판·상단바 */
  --serif:"Noto Serif KR","Nanum Myeongjo","바탕",Batang,serif;
  --sans:"Noto Sans KR","Pretendard","Malgun Gothic","맑은 고딕",sans-serif;
  --side:264px;
  /* 🪟 **영역을 나누는 법** — 연소사 2026-08-22 확정
     *"배경 색을 제거했을 때 영역마다 가독성을 높이기 좋았는데 … 너가 잘 표현해봐,
     투명도가 60% 정도인 흰색 배경을 사용하는 것은 괜찮아. **사각형은 사용하지 말고,
     사각 라운딩 처리**해서 투명도 70%도 좋아"*
     ⇨ 색을 깔지 않는다. **흰 종이를 60~70%로 겹치고 모서리를 둥글린다.**
        그러면 밑의 와트만지가 비치면서도 영역이 또렷이 갈린다.
     ⛔ 각진 네모를 쓰지 않는다 · ⛔ 색 판(연두·민트·하늘)을 쓰지 않는다 */
  --sheet:rgba(255,255,255,.30);      /* 읽는 영역 — 흰 종이를 **아주 여리게** */
  --sheet2:rgba(255,255,255,.42);     /* 안쪽 한 겹 더 */
  --rad:20px;                          /* 큰 영역 */
  --rad2:10px;                         /* 작은 상자·단추 */
  /* ✏️ 영역을 두르는 **굵고 큰 점선** — 연소사 2026-08-22 :
     *"배경 흰색의 투명도를 훨씬 높혀줘 그리고 외각 테두리는 색깔을 연하지만
     고등색(저채도) 높은 투명도의 **굵고 큰 점선** 사용해줘"*
     ⭐ 색은 팔레트의 **탠 카멜**(#ad9d82) — 채도가 낮은 따뜻한 갈색이라 종이와 다투지 않는다.
     ⭐ 굵기 4px 이면 크롬이 점을 그만큼 길게 그린다 (굵기가 점의 길이를 정한다).
     ⛔ 진한 실선을 두르지 않는다 — 앞서 걷어 낸 그 네모가 다시 생긴다 */
  --dash:rgba(173,157,130,.34);
  /* ⭐ 크림 종이 — 팔레트의 웜 베이지를 **아주 옅게 얹어서** 만든다.
        ⛔ 팔레트 밖 색을 새로 만들지 않는다 (yeon-design 규칙).
        🧨 흰 종이는 화면처럼 보이고 고전 책처럼 보이지 않는다 */
  --cream:linear-gradient(rgba(212,205,193,.26),rgba(212,205,193,.26));
  /* 🧻 **와트만지(수채 종이) 결** — 2026-08-22 연소사 :
        *"인연카드 같이 배경을 와트만지로 … 네 귀퉁이가 자연스럽게 종이의 살아 있는 끝"*
     ⛔ 사진 파일을 받아 쓰지 않는다 — 153장에 붙으면 무겁고 인쇄에서 뭉갠다.
        **SVG 잡음**으로 그린다 (파일 0개 · 어느 크기로 늘려도 안 깨진다)
     ⭐ `stitchTiles='stitch'` 가 있어야 타일 이음매가 안 보인다 */
  --fiber:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='f' x='0' y='0' width='100%25' height='100%25'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.86' numOctaves='4' seed='4' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23f)' opacity='0.055'/%3E%3C/svg%3E");
  --mottle:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='320' height='320'%3E%3Cfilter id='m' x='0' y='0' width='100%25' height='100%25'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.028' numOctaves='3' seed='9' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='320' height='320' filter='url(%23m)' opacity='0.042'/%3E%3C/svg%3E");
  /* 🌘 가장자리 그늘 — 마스크가 바깥 그림자를 잘라 내므로 **안쪽에서** 두께를 낸다 */
  --edge:linear-gradient(to bottom,rgba(42,46,44,.10),transparent 4%,
                         transparent 96%,rgba(42,46,44,.10)),
         linear-gradient(to right,rgba(42,46,44,.075),transparent 3%,
                         transparent 97%,rgba(42,46,44,.075));
  --deck:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='450' height='450' viewBox='0 0 450 450'%3E%3Cfilter id='b' x='-25%25' y='-25%25' width='150%25' height='150%25'%3E%3CfeGaussianBlur stdDeviation='1.5'/%3E%3C/filter%3E%3Cpath d='M16.0 16.0 L18.5 16.0 L21.0 16.0 L23.5 16.0 L26.0 16.0 L28.5 16.0 L31.0 15.9 L33.5 15.8 L36.0 15.6 L38.5 15.5 L41.0 15.3 L43.5 15.2 L46.0 15.0 L48.5 14.8 L51.0 14.4 L53.5 13.9 L56.0 13.1 L58.5 12.4 L61.0 12.0 L63.5 12.3 L66.0 13.1 L68.5 14.2 L71.0 15.1 L73.5 15.5 L76.0 15.5 L78.5 15.6 L81.0 15.9 L83.5 16.5 L86.0 16.9 L88.5 16.8 L91.0 16.1 L93.5 15.2 L96.0 14.4 L98.5 14.1 L101.0 14.3 L103.5 14.8 L106.0 15.2 L108.5 15.6 L111.0 16.1 L113.5 16.6 L116.0 17.1 L118.5 17.6 L121.0 17.9 L123.5 18.1 L126.0 18.2 L128.5 18.3 L131.0 18.3 L133.5 18.3 L136.0 18.1 L138.5 18.1 L141.0 18.2 L143.5 18.5 L146.0 18.8 L148.5 19.0 L151.0 18.9 L153.5 18.7 L156.0 18.4 L158.5 18.2 L161.0 18.0 L163.5 17.9 L166.0 17.7 L168.5 17.4 L171.0 17.1 L173.5 16.8 L176.0 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  --shade:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='450' height='450' viewBox='0 0 450 450'%3E%3Cfilter id='b' x='-25%25' y='-25%25' width='150%25' height='150%25'%3E%3CfeGaussianBlur stdDeviation='7'/%3E%3C/filter%3E%3Cpath d='M16.0 16.0 L26.0 16.0 L36.0 15.7 L46.0 15.1 L56.0 13.5 L66.0 13.4 L76.0 15.6 L86.0 16.8 L96.0 14.6 L106.0 15.3 L116.0 17.0 L126.0 18.0 L136.0 17.9 L146.0 18.5 L156.0 18.1 L166.0 17.5 L176.0 16.3 L186.0 14.7 L196.0 14.2 L206.0 12.4 L216.0 13.2 L226.0 15.6 L236.0 16.8 L246.0 14.6 L256.0 15.3 L266.0 17.0 L276.0 18.0 L286.0 17.9 L296.0 18.5 L306.0 18.1 L316.0 17.5 L326.0 16.3 L336.0 14.7 L346.0 14.2 L356.0 12.4 L366.0 13.2 L376.0 15.6 L386.0 16.7 L396.0 15.0 L406.0 15.7 L416.0 16.2 L426.0 16.1 L434.0 16.0 L433.7 26.0 L434.0 36.0 L434.8 46.0 L435.7 56.0 L438.0 66.0 L438.9 76.0 L437.6 86.0 L434.4 96.0 L434.5 106.0 L434.5 116.0 L433.4 126.0 L432.7 136.0 L431.1 146.0 L429.6 156.0 L429.1 166.0 L430.0 176.0 L433.9 186.0 L435.6 196.0 L436.4 206.0 L438.4 216.0 L438.9 226.0 L437.6 236.0 L434.4 246.0 L434.5 256.0 L434.5 266.0 L433.4 276.0 L432.7 286.0 L431.1 296.0 L429.6 306.0 L429.1 316.0 L430.0 326.0 L433.9 336.0 L435.6 346.0 L436.4 356.0 L438.4 366.0 L438.8 376.0 L437.1 386.0 L434.2 396.0 L434.2 406.0 L434.1 416.0 L434.0 426.0 L434.0 434.0 L426.0 433.9 L416.0 433.6 L406.0 433.8 L396.0 432.9 L386.0 434.4 L376.0 434.7 L366.0 433.6 L356.0 434.1 L346.0 435.6 L336.0 438.0 L326.0 437.7 L316.0 435.2 L306.0 432.3 L296.0 432.3 L286.0 432.2 L276.0 431.7 L266.0 432.2 L256.0 433.6 L246.0 432.3 L236.0 434.5 L226.0 434.7 L216.0 433.6 L206.0 434.1 L196.0 435.6 L186.0 438.0 L176.0 437.7 L166.0 435.2 L156.0 432.3 L146.0 432.3 L136.0 432.2 L126.0 431.7 L116.0 432.2 L106.0 433.6 L96.0 432.3 L86.0 434.5 L76.0 434.7 L66.0 433.7 L56.0 434.1 L46.0 434.8 L36.0 435.0 L26.0 434.3 L16.0 434.0 L16.1 426.0 L16.3 416.0 L16.2 406.0 L16.5 396.0 L17.7 386.0 L19.6 376.0 L17.1 366.0 L15.4 356.0 L14.7 346.0 L13.7 336.0 L10.8 326.0 L11.5 316.0 L12.9 306.0 L16.3 296.0 L20.0 286.0 L19.1 276.0 L17.6 266.0 L16.5 256.0 L16.8 246.0 L18.0 236.0 L19.7 226.0 L17.1 216.0 L15.4 206.0 L14.7 196.0 L13.7 186.0 L10.8 176.0 L11.5 166.0 L12.9 156.0 L16.3 146.0 L20.0 136.0 L19.1 126.0 L17.6 116.0 L16.5 106.0 L16.8 96.0 L18.0 86.0 L19.7 76.0 L17.0 66.0 L15.6 56.0 L15.4 46.0 L15.4 36.0 L15.6 26.0 L16.0 16.0 Z M50.0 50.0 L400.0 50.0 L400.0 400.0 L50.0 400.0 Z' filter='url(%23b)' fill-rule='evenodd' fill='%23fff'/%3E%3C/svg%3E");
  --tooth:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='t' x='0' y='0' width='100%25' height='100%25'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.135' numOctaves='3' seed='3' stitchTiles='stitch' result='n'/%3E%3CfeDiffuseLighting in='n' lighting-color='%23ffffff' surfaceScale='1.2' diffuseConstant='1'%3E%3CfeDistantLight azimuth='235' elevation='34'/%3E%3C/feDiffuseLighting%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23t)' opacity='0.21'/%3E%3C/svg%3E");
  --fine:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='t' x='0' y='0' width='100%25' height='100%25'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='1.1' numOctaves='3' seed='11' stitchTiles='stitch' result='n'/%3E%3CfeDiffuseLighting in='n' lighting-color='%23ffffff' surfaceScale='0.55' diffuseConstant='1'%3E%3CfeDistantLight azimuth='235' elevation='60'/%3E%3C/feDiffuseLighting%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23t)' opacity='0.11'/%3E%3C/svg%3E");
  --washi:var(--edge),var(--fine),var(--tooth),var(--mottle),
         linear-gradient(rgba(212,205,193,.11),rgba(212,205,193,.11));
}