:root { --bg: #000; --card: #111; --line: #2a2a2a; --text: #eee; --sub: #8a8a8a; --accent: #4f7bff; --danger: #ff6b6b; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; display: grid; place-items: center; padding: 16px;
  background: var(--bg); color: var(--text); font: 16px -apple-system, BlinkMacSystemFont, "Hiragino Sans", system-ui, sans-serif; }
.card { width: 100%; max-width: 360px; background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 28px 22px; }
h1 { margin: 0; font-size: 26px; letter-spacing: .02em; }
.sub { margin: 4px 0 22px; color: var(--sub); font-size: 14px; }
label { display: block; margin-bottom: 14px; font-size: 13px; color: var(--sub); }
input { display: block; width: 100%; margin-top: 6px; padding: 12px; font-size: 16px; color: var(--text);
  background: #000; border: 1px solid var(--line); border-radius: 10px; outline: none; }
input:focus { border-color: var(--accent); }
.pw { position: relative; display: block; }
.pw input { padding-right: 64px; }
#peek { position: absolute; right: 6px; top: 50%; transform: translateY(-50%); margin-top: 3px; padding: 6px 10px;
  font-size: 12px; color: var(--sub); background: transparent; border: 0; cursor: pointer; }
#submit { width: 100%; margin-top: 6px; padding: 13px; font-size: 16px; font-weight: 600; color: #fff;
  background: var(--accent); border: 0; border-radius: 10px; cursor: pointer; }
#submit:disabled { opacity: .5; cursor: default; }
#message { min-height: 1.4em; margin: 14px 0 0; color: var(--danger); font-size: 14px; line-height: 1.5; }
.note { margin: 8px 0 0; color: var(--sub); font-size: 12px; line-height: 1.5; }