:root {
  --ink: #172237;
  --muted: #647087;
  --paper: #f4f7fb;
  --card: #fff;
  --line: #d9e0eb;
  --accent: #2c5bd3;
  --accent-dark: #1f439f;
  font-family: Avenir, "Century Gothic", sans-serif;
  color: var(--ink);
  background: var(--paper);
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: radial-gradient(circle at 8% 10%, #dce8ff, transparent 32rem), linear-gradient(135deg, #f8faff, #edf2f9); }
.login-shell { min-height: 100vh; display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(390px, .75fr); }
.platform-intro { display: flex; flex-direction: column; justify-content: space-between; padding: clamp(30px, 6vw, 86px); }
.platform-brand { display: flex; align-items: center; gap: 16px; color: var(--ink); text-decoration: none; }
.platform-brand span { display: grid; place-items: center; width: 56px; height: 56px; color: white; background: var(--ink); font-weight: 900; }
.platform-brand strong { font-size: 1.1rem; }
.eyebrow { margin: 0; color: var(--accent-dark); text-transform: uppercase; letter-spacing: .2em; font-size: .74rem; font-weight: 900; }
.platform-intro h1 { max-width: 830px; margin: 14px 0 24px; font: 700 clamp(3.8rem, 8vw, 8rem)/.88 Georgia, serif; letter-spacing: -.055em; }
.platform-intro > div > p:not(.eyebrow) { max-width: 690px; color: var(--muted); font-size: 1.18rem; line-height: 1.65; }
.security-note { display: grid; gap: 7px; max-width: 620px; padding: 20px 22px; border-left: 4px solid var(--accent); background: #ffffff9e; }
.security-note span { color: var(--muted); line-height: 1.5; }
.login-card { display: flex; flex-direction: column; justify-content: center; padding: clamp(34px, 5vw, 74px); background: #fffffff0; border-left: 1px solid var(--line); box-shadow: -20px 0 70px #52627b18; }
.login-card h2 { margin: 10px 0 12px; font: 700 2.5rem/1 Georgia, serif; }
.login-card > div > p:not(.eyebrow) { color: var(--muted); line-height: 1.55; }
form { display: grid; gap: 20px; margin-top: 32px; }
label { display: grid; gap: 8px; color: var(--muted); font-size: .8rem; font-weight: 900; letter-spacing: .07em; text-transform: uppercase; }
input { width: 100%; min-height: 56px; padding: 12px 14px; color: var(--ink); background: white; border: 1px solid var(--line); border-radius: 7px; font: inherit; }
input:focus { outline: 3px solid #2c5bd32b; border-color: var(--accent); }
button { min-height: 56px; border: 1px solid var(--accent); border-radius: 7px; color: white; background: var(--accent); font: 800 1rem Avenir, sans-serif; cursor: pointer; }
button:hover { background: var(--accent-dark); }
button:disabled { opacity: .55; cursor: wait; }
.feedback { min-height: 24px; color: var(--muted); line-height: 1.4; }
.feedback[data-tone="error"] { color: #a1302c; }
.tenant-link { align-self: flex-start; margin-top: 30px; color: var(--accent-dark); font-weight: 800; }
@media (max-width: 850px) { .login-shell { grid-template-columns: 1fr; } .platform-intro { min-height: 56vh; gap: 60px; } .login-card { border-left: 0; border-top: 1px solid var(--line); } }