02Bevel chip — as the bevel angle value grows, the chip corner's facet width value grows with it

<main class="stage">
<div class="wrap is-demo" id="wrap">
  <button class="chip" id="chip" type="button" aria-pressed="false" aria-label="Toggle bevel angle">Label</button>
  <p class="readout" id="readout" aria-live="polite">Facet width 14.0</p>
</div>
</main>

@use "../../../../site/static/demo-tokens" as *;

// 계산 겹은 index.html 에 있다 — 베벨 각도 값에서 가로축 반경을 tan() 으로 역산하고 빗변 길이를 빗면 넓이로 쓴다.
@include stage($stage-yellow);

.wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-4;
}

.chip {
  appearance: none;
  border: none;
  padding: $sp-3 $sp-8;
  font-size: 14px;
  font-weight: 700;
  color: $subject-cream;
  background: $subject-blue-deep;
  corner-shape: bevel;
  border-radius: $r-sm;
  cursor: pointer;
  transition: box-shadow $dur-quick $ease-out;
  box-shadow: $shadow-raised;

  &:hover { box-shadow: $shadow-press; }
  &:focus-visible { outline: 2px solid $subject-ink; outline-offset: 3px; }
}

@supports not (corner-shape: bevel) {
  .chip { border: 1px solid rgba($subject-cream, .3); }
}

.readout {
  margin: 0;
  color: $subject-ink;
  font-size: 13px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 340px) {
  .chip { padding: $sp-2 $sp-6; font-size: 13px; }
}

@media (prefers-reduced-motion: reduce) {
  .chip { transition: none; }
}

html, body {
  margin: 0;
  overflow: hidden;
}

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #ffd23f;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.wrap {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
}

.chip {
  appearance: none;
  border: none;
  padding: 12px 32px;
  font-size: 14px;
  font-weight: 700;
  color: #fff7e6;
  background: #0a4fe8;
  corner-shape: bevel;
  border-radius: 8px;
  cursor: pointer;
  transition: box-shadow 220ms ease-out;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}
.chip:hover {
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}
.chip:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 3px;
}

@supports not (corner-shape: bevel) {
  .chip {
    border: 1px solid rgba(255, 247, 230, 0.3);
  }
}
.readout {
  margin: 0;
  color: #17141a;
  font-size: 13px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

@media (max-width: 340px) {
  .chip {
    padding: 8px 24px;
    font-size: 13px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .chip {
    transition: none;
  }
}

(function () {
  var BEVEL_DEG = 18; // 빗면이 도달하는 각도 상한 값 (변형 02 목표)
  var MIN_DEG = 8; // 빗면 각도 하한 값
  var BEVEL_RY = 14; // 계산 겹 상수: 세로축 Radius 고정값(px) — 각도가 커질수록 가로축만 늘어나 빗면이 넓어진다
  var BEVEL_MS = 2000; // 각도가 하한에서 상한까지 한 번 오가는 주기
  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  var SUPPORTS = CSS.supports('corner-shape', 'bevel');

  var wrap = document.getElementById('wrap');
  var chip = document.getElementById('chip');
  var readout = document.getElementById('readout');
  var isDemo = true;
  var manualDeg = null;

  function human() { if (isDemo) { wrap.classList.remove('is-demo'); isDemo = false; } }

  // 계산 겹: 베벨 각도 값에서 가로축 반경을 삼각비로 역산하고, 두 반경의 빗변 길이를 빗면 넓이로 삼는다
  function applyAngle(deg) {
    var rad = deg * Math.PI / 180;
    var rx = BEVEL_RY * Math.tan(rad);
    var facetWidth = Math.hypot(rx, BEVEL_RY);
    if (SUPPORTS) {
      chip.style.borderTopRightRadius = rx.toFixed(2) + 'px ' + BEVEL_RY + 'px';
    } else {
      // 근사 폴백: 대각 빗면 대신 같은 Radius 크기의 둥근 모서리로 흉내
      chip.style.borderTopRightRadius = facetWidth.toFixed(2) + 'px';
    }
    readout.textContent = 'Facet width ' + facetWidth.toFixed(1);
  }

  chip.addEventListener('click', function () {
    human();
    manualDeg = manualDeg === BEVEL_DEG ? MIN_DEG : BEVEL_DEG;
    chip.setAttribute('aria-pressed', String(manualDeg === BEVEL_DEG));
    applyAngle(manualDeg);
  });

  var start = 0;
  function loop(ts) {
    if (!start) start = ts;
    if (isDemo) {
      if (reduce) {
        applyAngle(BEVEL_DEG);
      } else {
        var t = ((ts - start) % BEVEL_MS) / BEVEL_MS;
        var tri = t < 0.5 ? t * 2 : (1 - t) * 2;
        applyAngle(MIN_DEG + (BEVEL_DEG - MIN_DEG) * tri);
      }
    }
    requestAnimationFrame(loop);
  }
  requestAnimationFrame(loop);
})();

// BevelChip — vanilla 판(run/372/demo/02-corner-shape-bevel-chip/index.html) 의 React 포트.
// 베벨 각도 값에서 가로축 반경을 tan() 으로 역산하고 빗변 길이를 빗면 넓이로 쓴다.
import { useEffect, useRef } from "react";
import styles from "./BevelChip.module.scss";

type Box<T> = { current: T };

const BEVEL_DEG = 18; // 빗면이 도달하는 각도 상한 값 (변형 02 목표)
const MIN_DEG = 8; // 빗면 각도 하한 값
const BEVEL_RY = 14; // 계산 겹 상수: 세로축 반경 고정값(px) — 각도가 커질수록 가로축만 늘어나 빗면이 넓어진다
const BEVEL_MS = 2000; // 각도가 하한에서 상한까지 한 번 오가는 주기

export default function BevelChip() {
  const rootRef = useRef(null) as unknown as Box<HTMLDivElement>;
  const chipRef = useRef(null) as unknown as Box<HTMLButtonElement>;
  const readoutRef = useRef(null) as unknown as Box<HTMLParagraphElement>;
  const rafRef = useRef(0) as unknown as Box<number>;

  useEffect(() => {
    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
    const SUPPORTS = CSS.supports("corner-shape", "bevel");

    const root = rootRef.current;
    const chip = chipRef.current;
    const readout = readoutRef.current;
    if (!root || !chip || !readout) return;

    let isDemo = true;
    let manualDeg: number | null = null;

    function human() { if (isDemo) { root!.classList.remove(styles.isDemo); isDemo = false; } }

    // 계산 겹: 베벨 각도 값에서 가로축 반경을 삼각비로 역산하고, 두 반경의 빗변 길이를 빗면 넓이로 삼는다
    function applyAngle(deg: number) {
      const rad = deg * Math.PI / 180;
      const rx = BEVEL_RY * Math.tan(rad);
      const facetWidth = Math.hypot(rx, BEVEL_RY);
      if (SUPPORTS) {
        chip!.style.borderTopRightRadius = rx.toFixed(2) + "px " + BEVEL_RY + "px";
      } else {
        chip!.style.borderTopRightRadius = facetWidth.toFixed(2) + "px";
      }
      readout!.textContent = "빗면 넓이 " + facetWidth.toFixed(1);
    }

    function onClick() {
      human();
      manualDeg = manualDeg === BEVEL_DEG ? MIN_DEG : BEVEL_DEG;
      chip!.setAttribute("aria-pressed", String(manualDeg === BEVEL_DEG));
      applyAngle(manualDeg);
    }
    chip.addEventListener("click", onClick);

    let start = 0;
    function loop(ts: number) {
      if (!start) start = ts;
      if (isDemo) {
        if (reduce) {
          applyAngle(BEVEL_DEG);
        } else {
          const t = ((ts - start) % BEVEL_MS) / BEVEL_MS;
          const tri = t < 0.5 ? t * 2 : (1 - t) * 2;
          applyAngle(MIN_DEG + (BEVEL_DEG - MIN_DEG) * tri);
        }
      }
      rafRef.current = requestAnimationFrame(loop);
    }
    rafRef.current = requestAnimationFrame(loop);

    return () => {
      chip.removeEventListener("click", onClick);
      cancelAnimationFrame(rafRef.current);
    };
  }, []);

  return (
    <main className={styles.stage}>
      <div className={styles.wrap + " " + styles.isDemo} ref={rootRef}>
        <button
          className={styles.chip}
          ref={chipRef}
          type="button"
          aria-pressed="false"
          aria-label="베벨 각도 전환"
        >라벨</button>
        <p className={styles.readout} ref={readoutRef} aria-live="polite">빗면 넓이 14.0</p>
      </div>
    </main>
  );
}