:root {
  --paper: #f2f0e9;
  --white: #fbfaf6;
  --ink: #171b18;
  --muted: #7e857f;
  --line: #d2d0c7;
  --acid: #dfff48;
  --coral: #bd3026;
}

* { box-sizing: border-box; }

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
}

button, input { font: inherit; }

.login-noise {
  position: fixed;
  z-index: 2;
  inset: 0;
  opacity: .035;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 160 160' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.92' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.7'/%3E%3C/svg%3E");
}

.login-shell {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(280px, .86fr) minmax(420px, 1.14fr);
  min-height: 100vh;
}

.login-brand {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: clamp(32px, 5vw, 76px);
  color: #e9ece4;
  background: var(--ink);
}

.login-brand img { width: min(148px, 48%); height: auto; object-fit: contain; object-position: left; }
.login-brand > p { margin: 20px 0 0; color: #9da69d; font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 10px; font-weight: 700; letter-spacing: 1.8px; line-height: 1.65; }
.login-brand-note { margin-top: auto; padding-top: 23px; border-top: 1px solid #3d443e; }
.login-brand-note span { display: block; color: var(--acid); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 9px; font-weight: 800; letter-spacing: 1.4px; }
.login-brand-note strong { display: block; margin-top: 12px; font-family: "Iowan Old Style", "Songti TC", Georgia, serif; font-size: clamp(21px, 2.3vw, 31px); font-weight: 500; letter-spacing: -.8px; }

.login-panel { display: flex; flex-direction: column; justify-content: center; width: min(500px, calc(100% - 64px)); margin: auto; }
.login-copy > p { margin: 0 0 14px; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 10px; font-weight: 750; letter-spacing: 1.4px; }
.login-copy h1 { margin: 0; font-family: "Iowan Old Style", "Songti TC", Georgia, serif; font-size: clamp(42px, 5vw, 64px); font-weight: 500; letter-spacing: -2.4px; }
.login-copy > span { display: block; max-width: 390px; margin-top: 16px; color: var(--muted); font-size: 13px; line-height: 1.8; }

form { display: grid; gap: 18px; margin-top: 46px; }
form label { display: grid; gap: 8px; }
form label > span { color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 9px; font-weight: 800; letter-spacing: 1px; }
input { width: 100%; min-height: 52px; padding: 0 15px; color: var(--ink); font-size: 16px; background: var(--white); border: 1px solid #a7aaa3; border-radius: 0; outline: 0; transition: border-color .16s ease, box-shadow .16s ease; }
input:focus { border-color: var(--ink); box-shadow: 4px 4px 0 var(--acid); }
.login-feedback { min-height: 18px; margin: -4px 0 0; color: var(--coral); font-size: 12px; font-weight: 650; }
#login-submit { display: flex; align-items: center; justify-content: space-between; min-height: 58px; margin-top: 2px; padding: 0 18px; color: var(--ink); font-size: 15px; font-weight: 800; text-align: left; background: var(--acid); border: 1px solid var(--ink); border-radius: 0; cursor: pointer; transition: transform .16s ease, background .16s ease; }
#login-submit span { font-size: 24px; font-weight: 400; }
#login-submit:hover { background: #ecff78; transform: translateY(-2px); }
#login-submit:disabled { cursor: wait; opacity: .66; transform: none; }
.login-footnote { margin: 52px 0 0; color: var(--muted); font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 8px; letter-spacing: 1px; }

@media (max-width: 760px) {
  .login-shell { grid-template-columns: 1fr; }
  .login-brand { min-height: 200px; padding: 30px 28px; }
  .login-brand img { width: 90px; }
  .login-brand > p { display: none; }
  .login-brand-note { margin-top: 28px; padding-top: 14px; }
  .login-brand-note strong { margin-top: 6px; font-size: 21px; }
  .login-panel { width: min(100% - 48px, 500px); padding: 54px 0; }
  .login-copy h1 { font-size: 48px; }
}