03인증번호 입력 그리드

<main class="stage">
  <div class="otp-card">
    <span class="otp-card__icon" aria-hidden="true">
      <svg viewBox="0 0 256 256"><g fill="currentColor"><path d="M208 88H48a8 8 0 0 0-8 8v112a8 8 0 0 0 8 8h160a8 8 0 0 0 8-8V96a8 8 0 0 0-8-8m-80 72a20 20 0 1 1 20-20a20 20 0 0 1-20 20" opacity=".2"/><path d="M208 80h-32V56a48 48 0 0 0-96 0v24H48a16 16 0 0 0-16 16v112a16 16 0 0 0 16 16h160a16 16 0 0 0 16-16V96a16 16 0 0 0-16-16M96 56a32 32 0 0 1 64 0v24H96Zm112 152H48V96h160zm-80-96a28 28 0 0 0-8 54.83V184a8 8 0 0 0 16 0v-17.17a28 28 0 0 0-8-54.83m0 40a12 12 0 1 1 12-12a12 12 0 0 1-12 12"/></g></svg>
    </span>
    <p class="otp-card__desc">Enter the 6-digit code we texted you</p>
    <div class="otp is-demo" role="group" aria-label="One-time code">
      <input class="otp__box" type="text" inputmode="numeric" pattern="[0-9]*" maxlength="1" aria-label="Digit 1">
      <input class="otp__box" type="text" inputmode="numeric" pattern="[0-9]*" maxlength="1" aria-label="Digit 2">
      <input class="otp__box" type="text" inputmode="numeric" pattern="[0-9]*" maxlength="1" aria-label="Digit 3">
      <input class="otp__box" type="text" inputmode="numeric" pattern="[0-9]*" maxlength="1" aria-label="Digit 4">
      <input class="otp__box" type="text" inputmode="numeric" pattern="[0-9]*" maxlength="1" aria-label="Digit 5">
      <input class="otp__box" type="text" inputmode="numeric" pattern="[0-9]*" maxlength="1" aria-label="Digit 6">
    </div>
  </div>
</main>

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

$duration: $dur-loop;                                  // 칸마다 번지는 포커스 웨이브 한 바퀴
$easing: $ease-out;
$color: $subject-blue;                                 // 포커스 강조 색 (신뢰감 있는 밝은 축)

@include stage($stage-paper);

.otp-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: $sp-2;
  width: min(280px, 88vw);
}
.otp-card__icon { width: 22px; height: 22px; color: $color; }
.otp-card__desc { margin: 0 0 $sp-1; font-size: 12px; color: #6b6455; font-family: inherit; text-align: center; }
.otp {
  display: flex;
  gap: $sp-2;
}
.otp__box {
  width: 34px; height: 42px;
  border: 2px solid #d8d2c4;
  border-radius: $r-sm;
  background: $stage-paper;
  text-align: center;
  font-size: 18px;
  font-weight: 700;
  font-family: inherit;
  color: $stage-ink;
  box-shadow: none;
}
.otp__box:focus-visible {
  outline: none;
  border-color: $color;
  box-shadow: 0 0 0 3px rgba($color, .25);
}

// 자동 재생 — 칸마다 순서대로 포커스 링이 번진다 (실제 입력은 JS 가 처리, index.html)
.otp.is-demo .otp__box { animation: otp-wave $duration $easing infinite; }
.otp.is-demo .otp__box:nth-child(1) { animation-delay: 0ms; }
.otp.is-demo .otp__box:nth-child(2) { animation-delay: 120ms; }
.otp.is-demo .otp__box:nth-child(3) { animation-delay: 240ms; }
.otp.is-demo .otp__box:nth-child(4) { animation-delay: 360ms; }
.otp.is-demo .otp__box:nth-child(5) { animation-delay: 480ms; }
.otp.is-demo .otp__box:nth-child(6) { animation-delay: 600ms; }

@keyframes otp-wave {
  0%, 84%, 100% { border-color: #d8d2c4; box-shadow: none; transform: scale(1); }
  6%            { border-color: $color; box-shadow: 0 0 0 4px rgba($color, .3), 0 0 22px 12px rgba($color, .35); transform: scale(1.1); }
  18%           { border-color: #d8d2c4; box-shadow: none; transform: scale(1); }
}

@media (prefers-reduced-motion: reduce) {
  .otp.is-demo .otp__box { animation: none; }
}

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);
}

.otp-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: min(280px, 88vw);
}

.otp-card__icon {
  width: 22px;
  height: 22px;
  color: #2f6df6;
}

.otp-card__desc {
  margin: 0 0 4px;
  font-size: 12px;
  color: #6b6455;
  font-family: inherit;
  text-align: center;
}

.otp {
  display: flex;
  gap: 8px;
}

.otp__box {
  width: 34px;
  height: 42px;
  border: 2px solid #d8d2c4;
  border-radius: 8px;
  background: #ffffff;
  text-align: center;
  font-size: 18px;
  font-weight: 700;
  font-family: inherit;
  color: #17141a;
  box-shadow: none;
}

.otp__box:focus-visible {
  outline: none;
  border-color: #2f6df6;
  box-shadow: 0 0 0 3px rgba(47, 109, 246, 0.25);
}

.otp.is-demo .otp__box {
  animation: otp-wave 2s ease-out infinite;
}

.otp.is-demo .otp__box:nth-child(1) {
  animation-delay: 0ms;
}

.otp.is-demo .otp__box:nth-child(2) {
  animation-delay: 120ms;
}

.otp.is-demo .otp__box:nth-child(3) {
  animation-delay: 240ms;
}

.otp.is-demo .otp__box:nth-child(4) {
  animation-delay: 360ms;
}

.otp.is-demo .otp__box:nth-child(5) {
  animation-delay: 480ms;
}

.otp.is-demo .otp__box:nth-child(6) {
  animation-delay: 600ms;
}

@keyframes otp-wave {
  0%, 84%, 100% {
    border-color: #d8d2c4;
    box-shadow: none;
    transform: scale(1);
  }
  6% {
    border-color: #2f6df6;
    box-shadow: 0 0 0 4px rgba(47, 109, 246, 0.3), 0 0 22px 12px rgba(47, 109, 246, 0.35);
    transform: scale(1.1);
  }
  18% {
    border-color: #d8d2c4;
    box-shadow: none;
    transform: scale(1);
  }
}
@media (prefers-reduced-motion: reduce) {
  .otp.is-demo .otp__box {
    animation: none;
  }
}

(function(){
  var boxes = Array.prototype.slice.call(document.querySelectorAll('.otp__box'));
  boxes.forEach(function(box, i){
    box.addEventListener('input', function(){
      box.value = box.value.replace(/[^0-9]/g, '').slice(0, 1);
      if (box.value && boxes[i + 1]) boxes[i + 1].focus({ preventScroll: true });
    });
    box.addEventListener('keydown', function(e){
      if (e.key === 'Backspace' && !box.value && boxes[i - 1]) boxes[i - 1].focus({ preventScroll: true });
    });
    box.addEventListener('paste', function(e){
      e.preventDefault();
      var digits = (e.clipboardData.getData('text') || '').replace(/[^0-9]/g, '').split('');
      boxes.forEach(function(b, j){ b.value = digits[j] || ''; });
      (boxes[Math.min(digits.length, boxes.length) - 1] || boxes[0]).focus({ preventScroll: true });
    });
  });
}());

import { useRef, useState } from "react";
import styles from "./OtpCodeGrid.module.scss";

export type OtpCodeGridProps = {
  length?: number;
  onComplete?: (code: string) => void;
};

/** 인증번호 입력 그리드 — 자동 이동 + 붙여넣기 분배 */
export default function OtpCodeGrid({ length = 6, onComplete }: OtpCodeGridProps) {
  const [digits, setDigits] = useState<string[]>(Array(length).fill(""));
  const refs = useRef<Array<HTMLInputElement | null>>([]);

  const setDigit = (i: number, value: string) => {
    const next = [...digits];
    next[i] = value;
    setDigits(next);
    if (next.every((d) => d)) onComplete?.(next.join(""));
  };

  return (
    <div className={styles.card}>
      <span className={styles.icon} aria-hidden="true">
        <svg viewBox="0 0 256 256">
          <g fill="currentColor">
            <path d="M208 88H48a8 8 0 0 0-8 8v112a8 8 0 0 0 8 8h160a8 8 0 0 0 8-8V96a8 8 0 0 0-8-8m-80 72a20 20 0 1 1 20-20a20 20 0 0 1-20 20" opacity=".2" />
            <path d="M208 80h-32V56a48 48 0 0 0-96 0v24H48a16 16 0 0 0-16 16v112a16 16 0 0 0 16 16h160a16 16 0 0 0 16-16V96a16 16 0 0 0-16-16M96 56a32 32 0 0 1 64 0v24H96Zm112 152H48V96h160zm-80-96a28 28 0 0 0-8 54.83V184a8 8 0 0 0 16 0v-17.17a28 28 0 0 0-8-54.83m0 40a12 12 0 1 1 12-12a12 12 0 0 1-12 12" />
          </g>
        </svg>
      </span>
      <p className={styles.desc}>Enter the {length}-digit code we texted you</p>
      <div className={styles.otp} role="group" aria-label="One-time code">
        {digits.map((d, i) => (
          <input
            key={i}
            ref={(el: HTMLInputElement | null) => { refs.current![i] = el; }}
            className={styles.box}
            type="text"
            inputMode="numeric"
            pattern="[0-9]*"
            maxLength={1}
            value={d}
            aria-label={`Digit ${i + 1}`}
            onChange={(e: any) => {
              const v = e.target.value.replace(/[^0-9]/g, "").slice(0, 1);
              setDigit(i, v);
              if (v && refs.current![i + 1]) refs.current![i + 1]!.focus({ preventScroll: true });
            }}
            onKeyDown={(e: any) => {
              if (e.key === "Backspace" && !digits[i] && refs.current![i - 1]) refs.current![i - 1]!.focus({ preventScroll: true });
            }}
            onPaste={(e: any) => {
              e.preventDefault();
              const pasted = e.clipboardData.getData("text").replace(/[^0-9]/g, "").split("");
              const next = Array(length).fill("").map((_, j) => pasted[j] || "");
              setDigits(next);
              if (next.every((n) => n)) onComplete?.(next.join(""));
              refs.current![Math.min(pasted.length, length) - 1]?.focus({ preventScroll: true });
            }}
          />
        ))}
      </div>
    </div>
  );
}