08Spotlight-style center field

<main class="stage">
  <div class="sp is-demo is-open" role="dialog" aria-modal="true" aria-label="Search all">
    <div class="sp__field">
      <span class="sp__mag" aria-hidden="true"><svg viewBox="0 0 256 256" width="18" height="18"><g fill="currentColor"><path d="M192 112a80 80 0 1 1-80-80a80 80 0 0 1 80 80" opacity=".2"/><path d="m229.66 218.34l-50.06-50.06a88.21 88.21 0 1 0-11.32 11.31l50.06 50.07a8 8 0 0 0 11.32-11.32M40 112a72 72 0 1 1 72 72a72.08 72.08 0 0 1-72-72"/></g></svg></span>
      <input class="sp__input" id="q" type="text" role="combobox" aria-expanded="true" aria-controls="list" aria-label="Search all" placeholder="Search all" autocomplete="off">
      <span class="sp__ghost" aria-hidden="true">report</span>
    </div>
    <div class="sp__panel">
      <span class="sp__sheet" aria-hidden="true"></span>
      <div class="sp__rows" id="list" role="listbox" aria-label="Results">
        <div class="sp__opt" id="o1" role="option" aria-selected="false" tabindex="-1">Weekly report</div>
        <div class="sp__opt" id="o2" role="option" aria-selected="false" tabindex="-1">Quarterly report</div>
        <div class="sp__opt" id="o3" role="option" aria-selected="false" tabindex="-1">Report template</div>
      </div>
    </div>
  </div>
</main>

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

$duration: $dur-base;
$easing: $ease-spring;
$color: $subject-cream;

@include stage($stage-paper);

.sp {
  box-sizing: border-box;
  width: min(264px, 88vw);
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: $color;
}

.sp__field {
  position: relative;
  box-sizing: border-box;
  height: 44px;
  display: flex; align-items: center; gap: $sp-3;
  padding: 0 $sp-4;
  border-radius: $r-card;
  background: $subject-ink;
  box-shadow: $shadow-raised;
}
.sp__mag { display: inline-flex; color: rgba(255, 247, 230, .5); }
.sp__input {
  flex: 1 1 auto;
  min-width: 0;
  border: 0; background: transparent;
  font-family: inherit;
  font-size: 15px; font-weight: 600;
  color: $color;
}
.sp__input::placeholder { color: rgba(255, 247, 230, .4); }
.sp__input:focus-visible { outline: 2px solid $subject-blue; outline-offset: 4px; border-radius: $r-sm; }
// 자동 루프는 친 글자를 고스트로 겹쳐 보여주므로, 루프 동안에는 placeholder 를 비운다
.sp.is-demo .sp__input::placeholder { color: transparent; }
.sp__ghost {
  position: absolute;
  left: 46px; top: 50%;
  transform: translateY(-50%);
  font-size: 15px; font-weight: 700;
  color: $color;
  opacity: 0;
  pointer-events: none;
}

// 패널 자리는 늘 잡아 두고(레이아웃이 흔들리지 않게) 위 모서리부터 잘라 보여준다.
// scaleY 로 줄였더니 글자까지 같이 눌려 납작해졌다 — clip-path 는 그린 것을 그대로 두고 잘라내기만 한다
.sp__panel {
  position: relative;
  box-sizing: border-box;
  height: 84px;
  margin: $sp-2 0 0;
  clip-path: inset(0 0 100% 0 round 16px);
}
.sp__sheet {
  position: absolute;
  inset: 0;
  border-radius: $r-card;
  background: $subject-ink;
  box-shadow: $shadow-press;
}
.sp__rows {
  position: relative;
  box-sizing: border-box;
  padding: $sp-2;
}
.sp.is-open .sp__panel { clip-path: inset(0 0 0 0 round 16px); }
.sp__opt {
  box-sizing: border-box;
  height: 22px;
  display: flex; align-items: center;
  padding: 0 $sp-2;
  border-radius: $r-sm;
  font-size: 12px; font-weight: 600;
  color: rgba(255, 247, 230, .82);
  white-space: nowrap;
  cursor: pointer;
}
.sp__opt.is-at { background: rgba(255, 247, 230, .12); }

// ── 자동 루프: 글자가 들어오면 패널이 위 모서리부터 펴지고, 글자가 지워지면 같은 자리로 접힌다 ──
// 접힘·펴짐이 둘 다 위 모서리 기준이라 한 바퀴 끝에 자리가 튀지 않는다
.sp.is-demo .sp__panel { animation: panel-open $dur-loop $easing infinite; }
.sp.is-demo .sp__ghost { animation: ghost-cut $dur-loop steps(1, end) infinite; }
@keyframes panel-open {
  0%, 42%   { clip-path: inset(0 0 0 0 round 16px); }
  58%, 74%  { clip-path: inset(0 0 100% 0 round 16px); }
  90%, 100% { clip-path: inset(0 0 0 0 round 16px); }
}
@keyframes ghost-cut {
  0%, 49%   { opacity: 1; }
  50%, 87%  { opacity: 0; }
  88%, 100% { opacity: 1; }
}

@media (prefers-reduced-motion: reduce) {
  .sp.is-demo .sp__panel,
  .sp.is-demo .sp__ghost { animation: none !important; }
  .sp__ghost { opacity: 0; }
}

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

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

.sp {
  box-sizing: border-box;
  width: min(264px, 88vw);
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  color: #fff7e6;
}

.sp__field {
  position: relative;
  box-sizing: border-box;
  height: 44px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 16px;
  border-radius: 16px;
  background: #17141a;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.sp__mag {
  display: inline-flex;
  color: rgba(255, 247, 230, 0.5);
}

.sp__input {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  background: transparent;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  color: #fff7e6;
}

.sp__input::placeholder {
  color: rgba(255, 247, 230, 0.4);
}

.sp__input:focus-visible {
  outline: 2px solid #2f6df6;
  outline-offset: 4px;
  border-radius: 8px;
}

.sp.is-demo .sp__input::placeholder {
  color: transparent;
}

.sp__ghost {
  position: absolute;
  left: 46px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 15px;
  font-weight: 700;
  color: #fff7e6;
  opacity: 0;
  pointer-events: none;
}

.sp__panel {
  position: relative;
  box-sizing: border-box;
  height: 84px;
  margin: 8px 0 0;
  clip-path: inset(0 0 100% 0 round 16px);
}

.sp__sheet {
  position: absolute;
  inset: 0;
  border-radius: 16px;
  background: #17141a;
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
}

.sp__rows {
  position: relative;
  box-sizing: border-box;
  padding: 8px;
}

.sp.is-open .sp__panel {
  clip-path: inset(0 0 0 0 round 16px);
}

.sp__opt {
  box-sizing: border-box;
  height: 22px;
  display: flex;
  align-items: center;
  padding: 0 8px;
  border-radius: 8px;
  font-size: 12px;
  font-weight: 600;
  color: rgba(255, 247, 230, 0.82);
  white-space: nowrap;
  cursor: pointer;
}

.sp__opt.is-at {
  background: rgba(255, 247, 230, 0.12);
}

.sp.is-demo .sp__panel {
  animation: panel-open 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.sp.is-demo .sp__ghost {
  animation: ghost-cut 2s steps(1, end) infinite;
}

@keyframes panel-open {
  0%, 42% {
    clip-path: inset(0 0 0 0 round 16px);
  }
  58%, 74% {
    clip-path: inset(0 0 100% 0 round 16px);
  }
  90%, 100% {
    clip-path: inset(0 0 0 0 round 16px);
  }
}
@keyframes ghost-cut {
  0%, 49% {
    opacity: 1;
  }
  50%, 87% {
    opacity: 0;
  }
  88%, 100% {
    opacity: 1;
  }
}
@media (prefers-reduced-motion: reduce) {
  .sp.is-demo .sp__panel,
  .sp.is-demo .sp__ghost {
    animation: none !important;
  }
  .sp__ghost {
    opacity: 0;
  }
}

// 실제 동작: 글자를 치면 결과 패널이 위 모서리를 축으로 펼쳐지고, 지우거나 Escape 를 치면 같은 축으로 접힌다.
var sp = document.querySelector('.sp');
var input = document.getElementById('q');
var opts = [].slice.call(document.querySelectorAll('.sp__opt'));
var at = -1;

function open(on) {
  sp.classList.remove('is-demo');
  sp.classList.toggle('is-open', on);
  input.setAttribute('aria-expanded', String(on));
  if (!on) { opts.forEach(function (o) { o.classList.remove('is-at'); }); at = -1; }
}
input.addEventListener('input', function () { open(input.value.trim().length > 0); });
document.addEventListener('keydown', function (e) {
  if (e.key === 'ArrowDown' || e.key === 'ArrowUp') {
    if (!sp.classList.contains('is-open')) return;
    sp.classList.remove('is-demo');
    at = Math.max(0, Math.min(at + (e.key === 'ArrowDown' ? 1 : -1), opts.length - 1));
    opts.forEach(function (o, k) { o.classList.toggle('is-at', k === at); });
    input.setAttribute('aria-activedescendant', opts[at].id);
    e.preventDefault();
  } else if (e.key === 'Enter' && opts[at]) {
    opts.forEach(function (o) { o.setAttribute('aria-selected', String(o === opts[at])); });
    e.preventDefault();
  } else if (e.key === 'Escape') {
    input.value = ''; open(false); input.focus({ preventScroll: true });
  }
});
opts.forEach(function (o, i) {
  o.addEventListener('mousemove', function () {
    sp.classList.remove('is-demo');
    at = i; opts.forEach(function (x, k) { x.classList.toggle('is-at', k === i); });
  });
});

import { useRef, useState } from "react";
import type { CSSProperties } from "react";
import styles from "./SpotlightSearch.module.scss";

export type SpotlightSearchProps = {
  placeholder?: string;
  results?: string[];
  duration?: number;
  easing?: string;
  color?: string;
};

type Vars = CSSProperties & { "--duration"?: string; "--easing"?: string; "--color"?: string };
type KeyEvt = { key: string; preventDefault: () => void };
type ChangeEvt = { target: { value: string } };

export default function SpotlightSearch({
  placeholder = "Search all",
  results = ["Weekly report", "Quarterly report", "Report template"],
  duration = 300,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#fff7e6",
}: SpotlightSearchProps) {
  const [query, setQuery] = useState("");
  const [at, setAt] = useState(-1);
  const [picked, setPicked] = useState<string | null>(null);
  const inputRef = useRef<HTMLInputElement>(null);
  const vars: Vars = { "--duration": `${duration}ms`, "--easing": easing, "--color": color };

  // 결과 자리는 늘 잡아 두고 위 모서리부터 잘라 보여준다 — scaleY 로 줄이면 글자까지 눌린다
  const open = query.trim().length > 0;

  return (
    <div className={styles.sp} style={vars} role="dialog" aria-modal="true" aria-label={placeholder}>
      <div className={styles.field}>
        <span className={styles.mag} aria-hidden="true">
          <svg viewBox="0 0 256 256" width="18" height="18">
            <g fill="currentColor">
              <path d="M192 112a80 80 0 1 1-80-80a80 80 0 0 1 80 80" opacity=".2" />
              <path d="m229.66 218.34l-50.06-50.06a88.21 88.21 0 1 0-11.32 11.31l50.06 50.07a8 8 0 0 0 11.32-11.32M40 112a72 72 0 1 1 72 72a72.08 72.08 0 0 1-72-72" />
            </g>
          </svg>
        </span>
        <input
          ref={inputRef}
          className={styles.input}
          type="text"
          role="combobox"
          aria-expanded={open}
          aria-controls="sl-list"
          aria-activedescendant={at >= 0 ? `sl-o${at}` : undefined}
          aria-label={placeholder}
          placeholder={placeholder}
          autoComplete="off"
          value={query}
          onChange={(e: ChangeEvt) => { setQuery(e.target.value); setAt(-1); }}
          onKeyDown={(e: KeyEvt) => {
            if (!open) return;
            if (e.key === "ArrowDown" || e.key === "ArrowUp") {
              e.preventDefault();
              setAt((a) => Math.max(0, Math.min(a + (e.key === "ArrowDown" ? 1 : -1), results.length - 1)));
            } else if (e.key === "Enter" && at >= 0) {
              e.preventDefault();
              setPicked(results[at]);
            } else if (e.key === "Escape") {
              setQuery(""); setAt(-1);
              inputRef.current?.focus({ preventScroll: true });
            }
          }}
        />
      </div>
      <div className={`${styles.panel} ${open ? styles.isOpen : ""}`}>
        <span className={styles.sheet} aria-hidden="true" />
        <div className={styles.rows} id="sl-list" role="listbox" aria-label="Results">
          {results.map((label, i) => (
            <div
              key={label}
              id={`sl-o${i}`}
              className={`${styles.opt} ${i === at ? styles.isAt : ""}`}
              role="option"
              aria-selected={label === picked}
              tabIndex={-1}
              onMouseMove={() => setAt(i)}
              onClick={() => setPicked(label)}
            >
              {label}
            </div>
          ))}
        </div>
      </div>
    </div>
  );
}