06Vertical volume bar — writing-mode rotation and flipping the fill direction

<main class="stage">
<div class="vv" id="vv">
  <p class="vv__hint">Rotating a horizontal slider -90° turns its coordinate system with it, so the same fill formula pours from bottom to top</p>
  <div class="vv__row" role="img" aria-label="Scene of a vertical volume slider filling from bottom to top">
    <span class="vv__label" aria-hidden="true">VOL</span>
    <div class="vv__col">
      <div class="vv__wrap" id="vvWrap">
        <input class="vv__range" id="vvRange" type="range" min="0" max="100" step="1" value="60" aria-label="Volume">
      </div>
      <span class="vv__icon" id="vvIcon"></span>
    </div>
  </div>
  <p class="vv__meta"><b class="vv__tag" id="vvPct">60%</b><span class="vv__unit">Fill = var(--pct), unchanged</span></p>
</div>
</main>

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

// 세로 볼륨바(06) — 가로 input 을 rotate(-90deg) 로 세운다. 좌표계가 함께 돌아
// 로컬 0%(화면 아래)에서 로컬 100%(화면 위) 로 향하므로, 채움 공식은 가로판과
// 같은 그대로 쓴다 — (100% - var(--pct)) 로 반전하면 채움이 화면 맨 위에 떨어진다.

$duration: $dur-quick;
$easing: $ease-out;
$color: $subject-blue;

@include stage($stage-yellow);

$track-h: 8px;
$thumb-d: 18px;
$bar-len: 132px;

.vv {
  display: flex; flex-direction: column; align-items: center; gap: $sp-3;
  width: 100%; max-width: 360px;
}

.vv__hint {
  margin: 0; font-weight: 700; font-size: clamp(10px, 2.8vw, 12px); line-height: 1.35;
  color: $subject-ink; text-align: center;
}

.vv__row { display: flex; align-items: center; gap: $sp-3; }

.vv__label {
  writing-mode: vertical-lr;
  font-weight: 800; font-size: 10px; letter-spacing: .08em;
  color: rgba($subject-ink, .72);
}

.vv__col { display: flex; flex-direction: column; align-items: center; gap: $sp-2; }

.vv__wrap {
  position: relative; width: $bar-len; height: $thumb-d;
  display: flex; align-items: center; justify-content: center;
  transform: rotate(-90deg);
  --pct: 60;
}

.vv__range {
  appearance: none; -webkit-appearance: none;
  width: $bar-len; height: $thumb-d; margin: 0; background: transparent;
}
.vv__range:focus-visible { outline: 2px solid $subject-ink; outline-offset: 4px; border-radius: $r-pill; }

.vv__range::-webkit-slider-runnable-track {
  height: $track-h; border-radius: $r-pill;
  // 로컬 오른쪽(값 큰 쪽=local 100%)이 회전 뒤 화면 위(top)로 온다. 네이티브 썸은
  // local 0%(왼쪽=화면 아래)에서 시작하므로, 채움도 local 0%(화면 아래)부터
  // var(--pct)% 까지 칠해야 썸과 같은 지점에서 "아래에서 위로" 자란다. 플립하면
  // 채움이 항상 화면 맨 위 조각으로 떨어져 썸과 분리된다(렌더 확인 후 수정).
  background: linear-gradient(to right, $color calc(var(--pct) * 1%), rgba($subject-ink, .16) calc(var(--pct) * 1%));
}
.vv__range::-webkit-slider-thumb {
  appearance: none; -webkit-appearance: none;
  width: $thumb-d; height: $thumb-d; border-radius: 50%;
  background: $subject-ink; box-shadow: $shadow-press;
  margin-top: calc(($track-h - $thumb-d) / 2);
}
.vv__range::-moz-range-track {
  height: $track-h; border-radius: $r-pill; background: rgba($subject-ink, .16);
}
.vv__range::-moz-range-progress {
  height: $track-h; border-radius: $r-pill; background: $color;
}
.vv__range::-moz-range-thumb {
  width: $thumb-d; height: $thumb-d; border: 0; border-radius: 50%;
  background: $subject-ink; box-shadow: $shadow-press;
}

.vv__icon { color: $subject-ink; display: flex; }

.vv__meta { margin: 0; font-size: clamp(9px, 2.4vw, 11px); color: rgba($subject-ink, .82); text-align: center; }
.vv__tag { font-weight: 700; color: $subject-blue-deep; font-variant-numeric: tabular-nums; margin-right: $sp-1; }
.vv__unit { color: rgba($subject-ink, .72); }

@media (max-width: 340px) {
  .vv { gap: $sp-2; max-width: 280px; }
  .vv__hint { font-size: 8px; }
  .vv__meta { font-size: 7px; }
  .vv__row { gap: $sp-2; }
}

@media (prefers-reduced-motion: reduce) {
  .vv__range { 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);
}

.vv {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: 100%;
  max-width: 360px;
}

.vv__hint {
  margin: 0;
  font-weight: 700;
  font-size: clamp(10px, 2.8vw, 12px);
  line-height: 1.35;
  color: #17141a;
  text-align: center;
}

.vv__row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.vv__label {
  writing-mode: vertical-lr;
  font-weight: 800;
  font-size: 10px;
  letter-spacing: 0.08em;
  color: rgba(23, 20, 26, 0.72);
}

.vv__col {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.vv__wrap {
  position: relative;
  width: 132px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: rotate(-90deg);
  --pct: 60;
}

.vv__range {
  appearance: none;
  -webkit-appearance: none;
  width: 132px;
  height: 18px;
  margin: 0;
  background: transparent;
}

.vv__range:focus-visible {
  outline: 2px solid #17141a;
  outline-offset: 4px;
  border-radius: 999px;
}

.vv__range::-webkit-slider-runnable-track {
  height: 8px;
  border-radius: 999px;
  background: linear-gradient(to right, #2f6df6 calc(var(--pct) * 1%), rgba(23, 20, 26, 0.16) calc(var(--pct) * 1%));
}

.vv__range::-webkit-slider-thumb {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: #17141a;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  margin-top: -5px;
}

.vv__range::-moz-range-track {
  height: 8px;
  border-radius: 999px;
  background: rgba(23, 20, 26, 0.16);
}

.vv__range::-moz-range-progress {
  height: 8px;
  border-radius: 999px;
  background: #2f6df6;
}

.vv__range::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border: 0;
  border-radius: 50%;
  background: #17141a;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.vv__icon {
  color: #17141a;
  display: flex;
}

.vv__meta {
  margin: 0;
  font-size: clamp(9px, 2.4vw, 11px);
  color: rgba(23, 20, 26, 0.82);
  text-align: center;
}

.vv__tag {
  font-weight: 700;
  color: #0a4fe8;
  font-variant-numeric: tabular-nums;
  margin-right: 4px;
}

.vv__unit {
  color: rgba(23, 20, 26, 0.72);
}

@media (max-width: 340px) {
  .vv {
    gap: 8px;
    max-width: 280px;
  }
  .vv__hint {
    font-size: 8px;
  }
  .vv__meta {
    font-size: 7px;
  }
  .vv__row {
    gap: 8px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .vv__range {
    transition: none;
  }
}

// 세로 볼륨바(06, 아이디어형) — 가로 input 을 -90도 회전시켜 세로로 세운다. 네이티브
// 썸은 로컬 0%(값이 작은 쪽)에서 시작하고, 회전 뒤 로컬 0%는 화면 아래쪽에 온다.
// 채움도 썸과 같은 지점(로컬 0% = 화면 아래)에서 var(--pct)% 까지 칠해야 "아래에서
// 위로" 차오른다 — 트랙 배경을 (100%-var(--pct)) 로 뒤집으면 채움이 항상 화면
// 맨 위 조각으로 떨어져 썸과 분리된다(렌더 확인 후 style.scss 에서 수정, 뒤집지 않음).
(function () {
  var root = document.getElementById('vv');
  var wrap = document.getElementById('vvWrap');
  var range = document.getElementById('vvRange');
  var pctEl = document.getElementById('vvPct');
  var iconEl = document.getElementById('vvIcon');
  if (!root || !wrap || !range || !pctEl || !iconEl) return;

  var ICONS = {
    none: '<svg viewBox="0 0 256 256" width="20" height="20"><g fill="currentColor"><path d="M80 88v80H32a8 8 0 0 1-8-8V96a8 8 0 0 1 8-8Z" opacity=".35"/><path d="M155.51 24.81a8 8 0 0 0-8.42.88L77.25 80H32a16 16 0 0 0-16 16v64a16 16 0 0 0 16 16h45.25l69.84 54.31A8 8 0 0 0 160 224V32a8 8 0 0 0-4.49-7.19M32 96h40v64H32Zm112 111.64l-56-43.55V91.91l56-43.55Z"/></g></svg>',
    low: '<svg viewBox="0 0 256 256" width="20" height="20"><g fill="currentColor"><path d="M80 88v80H32a8 8 0 0 1-8-8V96a8 8 0 0 1 8-8Z" opacity=".35"/><path d="M155.51 24.81a8 8 0 0 0-8.42.88L77.25 80H32a16 16 0 0 0-16 16v64a16 16 0 0 0 16 16h45.25l69.84 54.31A8 8 0 0 0 160 224V32a8 8 0 0 0-4.49-7.19M32 96h40v64H32Zm112 111.64l-56-43.55V91.91l56-43.55ZM208 128a39.93 39.93 0 0 1-10 26.46a8 8 0 0 1-12-10.58a24 24 0 0 0 0-31.72a8 8 0 1 1 12-10.58A40 40 0 0 1 208 128"/></g></svg>',
    high: '<svg viewBox="0 0 256 256" width="20" height="20"><g fill="currentColor"><path d="M80 88v80H32a8 8 0 0 1-8-8V96a8 8 0 0 1 8-8Z" opacity=".35"/><path d="M155.51 24.81a8 8 0 0 0-8.42.88L77.25 80H32a16 16 0 0 0-16 16v64a16 16 0 0 0 16 16h45.25l69.84 54.31A8 8 0 0 0 160 224V32a8 8 0 0 0-4.49-7.19M32 96h40v64H32Zm112 111.64l-56-43.55V91.91l56-43.55Zm54-106.08a40 40 0 0 1 0 52.88a8 8 0 0 1-12-10.58a24 24 0 0 0 0-31.72a8 8 0 0 1 12-10.58M248 128a79.9 79.9 0 0 1-20.37 53.34a8 8 0 0 1-11.92-10.67a64 64 0 0 0 0-85.33a8 8 0 1 1 11.92-10.67A79.83 79.83 0 0 1 248 128"/></g></svg>'
  };

  var MIN = 0, MAX = 100;
  var TAU = 0.13;

  function iconFor(v) {
    if (v <= 1) return 'none';
    if (v < 40) return 'low';
    return 'high';
  }

  var lastIcon = '';
  function paint(v) {
    var pct = (v - MIN) / (MAX - MIN) * 100;
    wrap.style.setProperty('--pct', pct.toFixed(2));
    pctEl.textContent = Math.round(pct) + '%';
    range.setAttribute('aria-valuenow', String(Math.round(v)));
    var key = iconFor(v);
    if (key !== lastIcon) { iconEl.innerHTML = ICONS[key]; lastIcon = key; }
  }

  var current = 60;
  paint(current);

  var reduce = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

  var playing = true;
  function stop() { playing = false; }
  range.addEventListener('pointerdown', stop);
  range.addEventListener('keydown', stop);
  range.addEventListener('input', function () { current = Number(range.value); paint(current); });

  var targets = [60, 2, 88, 30, 100, 60];
  var seg = 0, segFrom = current;
  var SEG_MS = 400;
  var segStart = performance.now();

  if (reduce) {
    current = targets[0];
    range.value = String(current);
    paint(current);
  } else {
    (function step(now) {
      if (playing) {
        var elapsed = now - segStart;
        if (elapsed >= SEG_MS) {
          seg = (seg + 1) % targets.length;
          segStart = now; elapsed = 0; segFrom = current;
        }
        var target = targets[seg];
        var t = elapsed / 1000;
        var k = 1 - Math.exp(-t / TAU);
        current = segFrom + (target - segFrom) * k;
        range.value = String(Math.round(current));
        paint(current);
      }
      requestAnimationFrame(step);
    })(segStart);
  }
})();

// RangeSliderVerticalVolumeStyle — vanilla 판(run/334/demo/06-range-slider-vertical-volume-style/index.html)
// 의 React 포트. 가로 input 을 -90도 회전시켜 세로로 세운다. 좌표계가 함께 돌아 로컬 0%
// (화면 아래)에서 로컬 100%(화면 위) 로 향하므로, 채움 공식은 가로판과 같은 그대로 쓴다 —
// (100% - var(--pct)) 로 반전하면 채움이 화면 맨 위에 떨어져 썸과 분리된다.
import { useEffect, useRef } from "react";
import type { CSSProperties } from "react";
import styles from "./RangeSliderVerticalVolumeStyle.module.scss";

export type RangeSliderVerticalVolumeStyleProps = {
  duration?: string;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type Box<T> = { current: T };

const HINT = "가로 슬라이더를 -90도 돌려 세우면 좌표계가 함께 돌아, 채움 공식 그대로 아래에서 위로 차오릅니다";
const ARIA_SCENE = "아래에서 위로 차오르는 세로 볼륨 슬라이더 장면";
const RANGE_LABEL = "볼륨";
const UNIT = "채움 = var(--pct) 그대로";

const ICONS: Record<"none" | "low" | "high", string> = {
  none: '<svg viewBox="0 0 256 256" width="20" height="20"><g fill="currentColor"><path d="M80 88v80H32a8 8 0 0 1-8-8V96a8 8 0 0 1 8-8Z" opacity=".35"/><path d="M155.51 24.81a8 8 0 0 0-8.42.88L77.25 80H32a16 16 0 0 0-16 16v64a16 16 0 0 0 16 16h45.25l69.84 54.31A8 8 0 0 0 160 224V32a8 8 0 0 0-4.49-7.19M32 96h40v64H32Zm112 111.64l-56-43.55V91.91l56-43.55Z"/></g></svg>',
  low: '<svg viewBox="0 0 256 256" width="20" height="20"><g fill="currentColor"><path d="M80 88v80H32a8 8 0 0 1-8-8V96a8 8 0 0 1 8-8Z" opacity=".35"/><path d="M155.51 24.81a8 8 0 0 0-8.42.88L77.25 80H32a16 16 0 0 0-16 16v64a16 16 0 0 0 16 16h45.25l69.84 54.31A8 8 0 0 0 160 224V32a8 8 0 0 0-4.49-7.19M32 96h40v64H32Zm112 111.64l-56-43.55V91.91l56-43.55ZM208 128a39.93 39.93 0 0 1-10 26.46a8 8 0 0 1-12-10.58a24 24 0 0 0 0-31.72a8 8 0 1 1 12-10.58A40 40 0 0 1 208 128"/></g></svg>',
  high: '<svg viewBox="0 0 256 256" width="20" height="20"><g fill="currentColor"><path d="M80 88v80H32a8 8 0 0 1-8-8V96a8 8 0 0 1 8-8Z" opacity=".35"/><path d="M155.51 24.81a8 8 0 0 0-8.42.88L77.25 80H32a16 16 0 0 0-16 16v64a16 16 0 0 0 16 16h45.25l69.84 54.31A8 8 0 0 0 160 224V32a8 8 0 0 0-4.49-7.19M32 96h40v64H32Zm112 111.64l-56-43.55V91.91l56-43.55Zm54-106.08a40 40 0 0 1 0 52.88a8 8 0 0 1-12-10.58a24 24 0 0 0 0-31.72a8 8 0 0 1 12-10.58M248 128a79.9 79.9 0 0 1-20.37 53.34a8 8 0 0 1-11.92-10.67a64 64 0 0 0 0-85.33a8 8 0 1 1 11.92-10.67A79.83 79.83 0 0 1 248 128"/></g></svg>'
};

const MIN = 0, MAX = 100;
const TAU = 0.13;
const TARGETS = [60, 2, 88, 30, 100, 60];
const SEG_MS = 400;

function iconFor(v: number): "none" | "low" | "high" {
  if (v <= 1) return "none";
  if (v < 40) return "low";
  return "high";
}

export default function RangeSliderVerticalVolumeStyle({
  duration = "220ms",
  easing = "ease-out",
  color = "#2f6df6"
}: RangeSliderVerticalVolumeStyleProps) {
  const wrapRef = useRef<HTMLDivElement | null>(null);
  const rangeRef = useRef<HTMLInputElement | null>(null);
  const pctRef = useRef<HTMLElement | null>(null);
  const iconRef = useRef<HTMLElement | null>(null);
  const rafRef = useRef(0) as Box<number>;

  useEffect(() => {
    const wrap = wrapRef.current;
    const range = rangeRef.current;
    const pctEl = pctRef.current;
    const iconEl = iconRef.current;
    if (!wrap || !range || !pctEl || !iconEl) return;

    let lastIcon = "";
    function paint(v: number): void {
      const pct = ((v - MIN) / (MAX - MIN)) * 100;
      wrap!.style.setProperty("--pct", pct.toFixed(2));
      pctEl!.textContent = Math.round(pct) + "%";
      range!.setAttribute("aria-valuenow", String(Math.round(v)));
      const key = iconFor(v);
      if (key !== lastIcon) { iconEl!.innerHTML = ICONS[key]; lastIcon = key; }
    }

    let current = 60;
    paint(current);

    const reduce = window.matchMedia("(prefers-reduced-motion: reduce)").matches;

    let playing = true;
    function stop(): void { playing = false; }
    const onInput = (): void => { current = Number(range!.value); paint(current); };
    range.addEventListener("pointerdown", stop);
    range.addEventListener("keydown", stop);
    range.addEventListener("input", onInput);

    let seg = 0, segFrom = current;
    let segClock = performance.now();

    if (reduce) {
      current = TARGETS[0];
      range.value = String(current);
      paint(current);
    } else {
      const step = (now: number): void => {
        if (playing) {
          let elapsed = now - segClock;
          if (elapsed >= SEG_MS) {
            seg = (seg + 1) % TARGETS.length;
            segClock = now; elapsed = 0; segFrom = current;
          }
          const target = TARGETS[seg];
          const t = elapsed / 1000;
          const k = 1 - Math.exp(-t / TAU);
          current = segFrom + (target - segFrom) * k;
          range!.value = String(Math.round(current));
          paint(current);
        }
        rafRef.current = requestAnimationFrame(step);
      };
      rafRef.current = requestAnimationFrame(step);
    }

    return () => {
      cancelAnimationFrame(rafRef.current);
      range.removeEventListener("pointerdown", stop);
      range.removeEventListener("keydown", stop);
      range.removeEventListener("input", onInput);
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  return (
    <main className={styles.stage}>
      <div
        className={styles.vv}
        style={{ "--duration": duration, "--easing": easing, "--color": color } as Vars}
      >
        <p className={styles.hint}>{HINT}</p>
        <div className={styles.row} role="img" aria-label={ARIA_SCENE}>
          <span className={styles.label} aria-hidden="true">VOL</span>
          <div className={styles.col}>
            <div className={styles.wrap} ref={wrapRef}>
              <input
                className={styles.range}
                ref={rangeRef}
                type="range"
                min={0}
                max={100}
                step={1}
                defaultValue={60}
                aria-label={RANGE_LABEL}
              />
            </div>
            <span className={styles.icon} ref={iconRef}></span>
          </div>
        </div>
        <p className={styles.meta}>
          <b className={styles.tag} ref={pctRef}>60%</b>
          <span className={styles.unit}>{UNIT}</span>
        </p>
      </div>
    </main>
  );
}