02Split-screen login

<main class="stage">
  <div class="split is-demo">
    <div class="split__panel split__panel--image">
      <span class="split__brand">Godrich</span>
      <p class="split__tagline">Build fast, ship faster.</p>
    </div>
    <form class="split__panel split__panel--form" autocomplete="off">
      <span class="split__line split__line--label"></span>
      <span class="split__line split__line--input"></span>
      <span class="split__line split__line--label"></span>
      <span class="split__line split__line--input"></span>
      <button class="split__btn" type="button">Sign in</button>
    </form>
  </div>
</main>

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

$duration: $dur-enter;                                 // 패널 진입 시간
$easing: $ease-spring;
$color: $subject-blue;                                 // 이미지 패널 색

@include stage($stage-yellow);

.split {
  width: min(300px, 86vw);
  height: 150px;
  display: flex;
  overflow: hidden;
  border-radius: $r-card;
  box-shadow: $shadow-raised;
}
.split__panel {
  width: 50%;
  height: 100%;
  box-sizing: border-box;
  padding: $sp-3 $sp-2;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: $sp-1;
}
.split__panel--image {
  background: linear-gradient(155deg, $color, #475990);
  color: $stage-paper;
  gap: $sp-2;
}
.split__brand { font-weight: 700; font-size: 14px; font-family: inherit; }
.split__tagline { margin: 0; font-size: 11px; opacity: .85; font-family: inherit; }
.split__panel--form { background: $stage-paper; gap: $sp-1; }
.split__line {
  display: block;
  border-radius: $r-xs;
  background: #e6e2d8;
}
.split__line--label { width: 40%; height: 6px; }
.split__line--input { width: 100%; height: 14px; border-radius: $r-sm; }
.split__btn {
  margin-top: $sp-1;
  padding: $sp-1 $sp-2;
  border: none;
  border-radius: $r-sm;
  background: $color;
  color: $stage-paper;
  font-weight: 700;
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
  transition: transform $dur-instant $ease-out;
}
.split__btn:hover, .split__btn:focus-visible { transform: translateY(-1px); }

.split.is-demo .split__panel--image { animation: enter-left $dur-loop $easing infinite; }
.split.is-demo .split__panel--form { animation: enter-right $dur-loop $easing infinite; }

@keyframes enter-left {
  0%, 100%    { transform: translateX(-16%); }
  35%, 90%    { transform: translateX(0); }
}
@keyframes enter-right {
  0%, 100%    { transform: translateX(16%); }
  35%, 90%    { transform: translateX(0); }
}

@media (prefers-reduced-motion: reduce) {
  .split.is-demo .split__panel--image,
  .split.is-demo .split__panel--form { animation: none; transform: 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);
}

.split {
  width: min(300px, 86vw);
  height: 150px;
  display: flex;
  overflow: hidden;
  border-radius: 16px;
  box-shadow: 0 14px 24px rgba(23, 20, 26, 0.32);
}

.split__panel {
  width: 50%;
  height: 100%;
  box-sizing: border-box;
  padding: 12px 8px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}

.split__panel--image {
  background: linear-gradient(155deg, #2f6df6, #475990);
  color: #ffffff;
  gap: 8px;
}

.split__brand {
  font-weight: 700;
  font-size: 14px;
  font-family: inherit;
}

.split__tagline {
  margin: 0;
  font-size: 11px;
  opacity: 0.85;
  font-family: inherit;
}

.split__panel--form {
  background: #ffffff;
  gap: 4px;
}

.split__line {
  display: block;
  border-radius: 4px;
  background: #e6e2d8;
}

.split__line--label {
  width: 40%;
  height: 6px;
}

.split__line--input {
  width: 100%;
  height: 14px;
  border-radius: 8px;
}

.split__btn {
  margin-top: 4px;
  padding: 4px 8px;
  border: none;
  border-radius: 8px;
  background: #2f6df6;
  color: #ffffff;
  font-weight: 700;
  font-size: 12px;
  font-family: inherit;
  cursor: pointer;
  transition: transform 140ms ease-out;
}

.split__btn:hover, .split__btn:focus-visible {
  transform: translateY(-1px);
}

.split.is-demo .split__panel--image {
  animation: enter-left 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

.split.is-demo .split__panel--form {
  animation: enter-right 2s cubic-bezier(0.2, 0.8, 0.2, 1) infinite;
}

@keyframes enter-left {
  0%, 100% {
    transform: translateX(-16%);
  }
  35%, 90% {
    transform: translateX(0);
  }
}
@keyframes enter-right {
  0%, 100% {
    transform: translateX(16%);
  }
  35%, 90% {
    transform: translateX(0);
  }
}
@media (prefers-reduced-motion: reduce) {
  .split.is-demo .split__panel--image,
  .split.is-demo .split__panel--form {
    animation: none;
    transform: none;
  }
}

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

export type SplitScreenLoginProps = {
  /** 패널이 밀려 들어오는 시간 (기본 600ms) */
  duration?: number;
  easing?: string;
  /** 이미지 패널 색 */
  color?: string;
};

/** 화면 진입 시 두 패널이 좌우에서 밀려 들어온다. 마운트 직후 한 번만 재생 */
export default function SplitScreenLogin({
  duration = 600,
  easing = "cubic-bezier(.2,.8,.2,1)",
  color = "#2f6df6",
}: SplitScreenLoginProps) {
  const [entered, setEntered] = useState(false);
  useEffect(() => {
    const id = requestAnimationFrame(() => setEntered(true));
    return () => cancelAnimationFrame(id);
  }, []);
  const style = { "--duration": `${duration}ms`, "--easing": easing, "--color": color } as CSSProperties;
  return (
    <div className={styles.split} style={style}>
      <div className={`${styles.panel} ${styles.image} ${entered ? styles.in : styles.outLeft}`}>
        <span className={styles.brand}>Godrich</span>
        <p className={styles.tagline}>Build fast, ship faster.</p>
      </div>
      <form
        className={`${styles.panel} ${styles.form} ${entered ? styles.in : styles.outRight}`}
        onSubmit={(e: { preventDefault(): void }) => e.preventDefault()}
      >
        <span className={`${styles.line} ${styles.label}`} />
        <span className={`${styles.line} ${styles.field}`} />
        <span className={`${styles.line} ${styles.label}`} />
        <span className={`${styles.line} ${styles.field}`} />
        <button className={styles.btn} type="submit">Sign in</button>
      </form>
    </div>
  );
}