:root {
  color-scheme: dark;
  --ink: #eef3e9;
  --muted: #91a29c;
  --line: rgba(213, 232, 221, 0.14);
  --accent: #d8ff72;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 12%, rgba(57, 120, 103, 0.22), transparent 35rem),
    radial-gradient(circle at 88% 78%, rgba(153, 185, 66, 0.1), transparent 30rem),
    #081011;
}

.login-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 2rem 1.25rem;
}

.login-card {
  width: min(100%, 28rem);
  padding: clamp(2rem, 7vw, 3.5rem);
  border: 1px solid var(--line);
  background: rgba(12, 25, 26, 0.82);
  box-shadow: 0 2rem 7rem rgba(0, 0, 0, 0.34);
  backdrop-filter: blur(18px);
}

.mark { margin: 0 0 2.5rem; color: var(--accent); font-size: 2.2rem; }
.eyebrow { margin: 0; color: var(--accent); font: 700 0.68rem/1.2 ui-monospace, monospace; letter-spacing: 0.18em; }
h1 { margin: 0.45rem 0 0; font: 600 clamp(3.3rem, 14vw, 5.6rem)/0.95 Georgia, "Noto Serif TC", serif; letter-spacing: -0.06em; }
.intro { margin: 1.2rem 0 2.5rem; color: var(--muted); line-height: 1.7; }
label { display: block; margin-bottom: 0.65rem; color: #bdcac4; font-size: 0.82rem; }
input {
  width: 100%;
  min-height: 3.25rem;
  padding: 0.8rem 1rem;
  color: var(--ink);
  border: 1px solid rgba(213, 232, 221, 0.24);
  border-radius: 0;
  outline: none;
  background: #071011;
  font: inherit;
}
input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(216, 255, 114, 0.1); }
button {
  width: 100%;
  min-height: 3.25rem;
  margin-top: 0.85rem;
  padding: 0.8rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border: 0;
  color: #0a1110;
  background: var(--accent);
  font: 700 0.92rem/1 inherit;
  cursor: pointer;
}
button:hover { background: #e7ff9c; }
.privacy { margin: 1.15rem 0 0; color: #63716c; font-size: 0.72rem; text-align: center; }
.error { display: none; margin: -1.2rem 0 1.2rem; padding: 0.75rem; color: #ffc4b7; border-left: 2px solid #ff765c; background: rgba(255, 118, 92, 0.08); font-size: 0.82rem; }
.error:target { display: block; }