:root {
  --paper: #f7f5ef;
  --white: #fffefa;
  --ink: #20231f;
  --muted: #74776f;
  --line: rgba(34, 38, 32, 0.13);
  --coral: #f17358;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at 92% 8%, rgba(240, 201, 106, .23), transparent 27rem), var(--paper);
  color: var(--ink);
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
}
a { color: inherit; text-decoration: none; }
.login-shell { width: min(1180px, calc(100% - 44px)); min-height: 100vh; margin: 0 auto; padding: 34px 0 70px; display: grid; grid-template-columns: 1.15fr .85fr; gap: 72px; align-items: center; }
.brand { grid-column: 1 / -1; align-self: start; display: inline-flex; align-items: center; gap: 12px; width: fit-content; }
.brand-mark { width: 40px; height: 40px; position: relative; border: 1px solid var(--ink); border-radius: 50%; display: block; }
.brand-mark i { position: absolute; left: 9px; width: 21px; height: 1px; background: var(--ink); transform-origin: left center; }
.brand-mark i:nth-child(1) { top: 12px; transform: rotate(11deg); }
.brand-mark i:nth-child(2) { top: 19px; transform: rotate(-9deg); width: 17px; }
.brand-mark i:nth-child(3) { top: 26px; transform: rotate(7deg); width: 13px; }
.brand b { display: block; font-family: Arial, sans-serif; font-size: 14px; letter-spacing: .16em; }
.brand small { display: block; margin-top: 3px; color: var(--muted); font-size: 10px; }
.login-card { max-width: 650px; padding: 45px; background: rgba(255,254,250,.84); border: 1px solid var(--line); border-radius: 30px; box-shadow: 0 28px 80px rgba(61,55,42,.08); }
.eyebrow { display: flex; align-items: center; gap: 9px; color: #ca563f; font: 700 10px/1 Arial, sans-serif; letter-spacing: .18em; }
.eyebrow span { width: 8px; height: 8px; border-radius: 50%; background: var(--coral); box-shadow: 0 0 0 6px rgba(241,115,88,.12); }
h1 { margin: 20px 0 16px; font: 600 clamp(43px, 5vw, 67px)/1.12 "Noto Serif TC", serif; letter-spacing: -.055em; }
h1 em { color: #ce5138; font-style: normal; }
.intro { margin: 0 0 30px; color: #656960; font-size: 13px; line-height: 1.8; }
.alert { margin: 0 0 18px; padding: 12px 14px; border: 1px solid rgba(206,81,56,.28); border-radius: 12px; background: rgba(241,115,88,.08); color: #a64230; font-size: 12px; }
.login-options { display: grid; gap: 11px; }
.provider-button { min-height: 72px; display: grid; grid-template-columns: 43px 1fr auto; gap: 14px; align-items: center; padding: 12px 17px; border: 1px solid var(--line); border-radius: 16px; background: var(--white); transition: transform .16s ease, border-color .16s ease, box-shadow .16s ease; }
.provider-button:hover { transform: translateY(-2px); border-color: rgba(32,35,31,.32); box-shadow: 0 12px 28px rgba(36,38,33,.07); }
.provider-icon { width: 38px; height: 38px; display: grid; place-content: center; border-radius: 50%; font: 700 17px/1 Arial, sans-serif; }
.line .provider-icon { background: #06c755; color: white; }
.google .provider-icon { border: 1px solid var(--line); color: #4285f4; }
.meta .provider-icon { background: #1877f2; color: white; font-size: 22px; }
.provider-button b, .provider-button small { display: block; }
.provider-button b { font-size: 13px; }
.provider-button small { margin-top: 5px; color: var(--muted); font-size: 9px; }
.provider-button > i { font-style: normal; color: var(--muted); }
.terms { margin: 22px 0 0; color: #8a8d86; font-size: 9px; line-height: 1.7; }
.terms a { color: #b94b36; text-decoration: underline; text-underline-offset: 2px; }
.login-note { padding: 34px 0; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.login-note > span { color: #ce5138; font-size: 10px; letter-spacing: .12em; }
.login-note strong { display: block; margin: 18px 0; font: 600 26px/1.55 "Noto Serif TC", serif; }
.login-note p { margin: 0; color: var(--muted); font-size: 12px; line-height: 1.8; }
@media (max-width: 800px) {
  .login-shell { grid-template-columns: 1fr; gap: 34px; padding-top: 22px; }
  .brand { grid-column: 1; }
  .login-card { padding: 28px 21px; border-radius: 23px; }
  .login-note { margin-bottom: 20px; }
}
@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }