09Glass input

<main class="stage">
  <div class="gi-field is-demo">
    <input class="gi-field__input gi-focal" type="email" placeholder=" ">
    <label class="gi-field__label">Email address</label>
  </div>
</main>

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

// ── 변수 3개 ──────────────────────────────────────────
$duration: $dur-quick;
$easing: $ease-out;
$color: $subject-blue;

@include stage($stage-ink);

.gi-field {
  position: relative;
  width: min(240px, 84vw);
}

.gi-field__input {
  width: 100%;
  box-sizing: border-box;
  padding: $sp-5 $sp-4 $sp-2;
  border-radius: $r-control;
  background: rgba(255, 255, 255, .12);
  border: 1px solid rgba(255, 255, 255, .3);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  box-shadow: $shadow-press;
  color: $subject-cream;
  font: 600 13px/1 -apple-system, "Segoe UI", sans-serif;
  outline: none;
  transition: border-color $duration $easing, box-shadow $duration $easing;
}
.gi-field__input::placeholder { color: transparent; }

// top·left 는 고정, 뜨는 움직임은 transform 만
.gi-field__label {
  position: absolute;
  left: $sp-4;
  top: 50%;
  transform: translateY(-50%) scale(1);
  transform-origin: left center; // 규칙8: 좌측 패딩 붙은 라벨 뜸
  color: rgba($subject-cream, .6);
  font: 600 13px/1 -apple-system, "Segoe UI", sans-serif;
  pointer-events: none;
  transition: transform $duration $easing, color $duration $easing;
}

// 실사용: 진짜 포커스로 라벨이 뜨고 테두리 빛이 밝아진다
.gi-field:focus-within .gi-field__label { transform: translateY(-14px) scale(.82); color: $subject-cream; }
.gi-field:focus-within .gi-focal { border-color: rgba($color, .9); box-shadow: 0 0 0 3px rgba($color, .35), $shadow-raised; }

// 데모 루프: is-demo 는 같은 상태를 keyframes 로 반복 (헤드리스는 :focus-within 을 못 건다, .focus() 는 안 쓴다 — BD18)
@keyframes gi-label-loop {
  0%, 20%  { transform: translateY(-50%) scale(1); color: rgba($subject-cream, .6); }
  50%, 70% { transform: translateY(-14px) scale(.82); color: $subject-cream; }
  100%     { transform: translateY(-50%) scale(1); color: rgba($subject-cream, .6); }
}
@keyframes gi-input-loop {
  0%, 20%  { border-color: rgba(255, 255, 255, .3); box-shadow: $shadow-press; }
  50%, 70% { border-color: rgba($color, .9); box-shadow: 0 0 0 3px rgba($color, .35), $shadow-raised; }
  100%     { border-color: rgba(255, 255, 255, .3); box-shadow: $shadow-press; }
}
.gi-field.is-demo .gi-field__label { animation: gi-label-loop $dur-loop $easing infinite; }
.gi-field.is-demo .gi-focal { animation: gi-input-loop $dur-loop $easing infinite; }

@media (prefers-reduced-motion: reduce) {
  .gi-field__label, .gi-focal { transition: none; }
  .gi-field.is-demo .gi-field__label,
  .gi-field.is-demo .gi-focal { animation: none !important; }
}

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

.stage {
  box-sizing: border-box;
  min-height: 100vh;
  display: grid;
  place-items: center;
  margin: 0;
  background: #17141a;
  font-family: -apple-system, "Segoe UI", "Noto Sans KR", sans-serif;
  padding: clamp(8px, 4vw, 24px);
}

.gi-field {
  position: relative;
  width: min(240px, 84vw);
}

.gi-field__input {
  width: 100%;
  box-sizing: border-box;
  padding: 20px 16px 8px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  color: #fff7e6;
  font: 600 13px/1 -apple-system, "Segoe UI", sans-serif;
  outline: none;
  transition: border-color 220ms ease-out, box-shadow 220ms ease-out;
}

.gi-field__input::placeholder {
  color: transparent;
}

.gi-field__label {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%) scale(1);
  transform-origin: left center;
  color: rgba(255, 247, 230, 0.6);
  font: 600 13px/1 -apple-system, "Segoe UI", sans-serif;
  pointer-events: none;
  transition: transform 220ms ease-out, color 220ms ease-out;
}

.gi-field:focus-within .gi-field__label {
  transform: translateY(-14px) scale(0.82);
  color: #fff7e6;
}

.gi-field:focus-within .gi-focal {
  border-color: rgba(47, 109, 246, 0.9);
  box-shadow: 0 0 0 3px rgba(47, 109, 246, 0.35), 0 14px 24px rgba(23, 20, 26, 0.32);
}

@keyframes gi-label-loop {
  0%, 20% {
    transform: translateY(-50%) scale(1);
    color: rgba(255, 247, 230, 0.6);
  }
  50%, 70% {
    transform: translateY(-14px) scale(0.82);
    color: #fff7e6;
  }
  100% {
    transform: translateY(-50%) scale(1);
    color: rgba(255, 247, 230, 0.6);
  }
}
@keyframes gi-input-loop {
  0%, 20% {
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  }
  50%, 70% {
    border-color: rgba(47, 109, 246, 0.9);
    box-shadow: 0 0 0 3px rgba(47, 109, 246, 0.35), 0 14px 24px rgba(23, 20, 26, 0.32);
  }
  100% {
    border-color: rgba(255, 255, 255, 0.3);
    box-shadow: 0 6px 12px rgba(23, 20, 26, 0.32);
  }
}
.gi-field.is-demo .gi-field__label {
  animation: gi-label-loop 2s ease-out infinite;
}

.gi-field.is-demo .gi-focal {
  animation: gi-input-loop 2s ease-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  .gi-field__label, .gi-focal {
    transition: none;
  }
  .gi-field.is-demo .gi-field__label,
  .gi-field.is-demo .gi-focal {
    animation: none !important;
  }
}

import { CSSProperties } from "react";
import styles from "./GlassInput.module.scss";

type Vars = CSSProperties & {
  "--duration"?: string;
  "--easing"?: string;
  "--color"?: string;
};

export interface GlassInputProps {
  duration?: string;
  easing?: string;
  color?: string;
}

export default function GlassInput({
  duration = "220ms",
  easing = "ease-out",
  color = "#2f6df6",
}: GlassInputProps) {
  const style: Vars = { "--duration": duration, "--easing": easing, "--color": color };
  return (
    <div className={styles.field} style={style}>
      <input id="gi-email" className={styles.input} type="email" placeholder=" " />
      <label className={styles.label} htmlFor="gi-email">Email address</label>
    </div>
  );
}