:root {
  color-scheme: light;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  background: #e8f0ef;
  color: #142b35;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: radial-gradient(circle at 18% 10%, #f9fcfb 0, #e8f0ef 42%, #dce8e6 100%); }
.auth-shell { min-height: 100vh; display: grid; place-items: center; padding: 28px 18px; }
.auth-card { width: min(440px, 100%); padding: 38px; background: rgba(255,255,255,.96); border: 1px solid #b9cecb; border-radius: 18px; box-shadow: 0 24px 70px rgba(28,68,72,.16); }
.auth-mark { width: 58px; height: 58px; display: grid; place-items: center; border-radius: 16px; background: #176e6b; color: white; font-weight: 800; letter-spacing: -.04em; }
.eyebrow { margin: 24px 0 8px; color: #267c77; font-size: 11px; font-weight: 800; letter-spacing: .14em; }
h1 { margin: 0; font-size: 31px; letter-spacing: -.04em; }
.intro { margin: 10px 0 25px; color: #60747b; line-height: 1.55; }
.auth-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; padding: 4px; margin-bottom: 20px; background: #edf4f3; border: 1px solid #c7d9d6; border-radius: 11px; }
.auth-tabs button { border: 0; border-radius: 8px; padding: 10px; background: transparent; color: #546a70; font-weight: 700; cursor: pointer; }
.auth-tabs button.active { background: white; color: #155f5c; box-shadow: 0 2px 8px rgba(30,73,77,.12); }
form { display: grid; gap: 15px; }
label span { display: block; margin-bottom: 7px; color: #3d555d; font-size: 13px; font-weight: 700; }
input { width: 100%; padding: 12px 13px; border: 1px solid #b9cdca; border-radius: 9px; background: #fbfdfd; color: #142b35; font: inherit; outline: none; }
input:focus { border-color: #197a75; box-shadow: 0 0 0 3px rgba(25,122,117,.13); }
.primary { margin-top: 4px; padding: 13px; border: 0; border-radius: 9px; background: #176e6b; color: white; font: inherit; font-weight: 800; cursor: pointer; }
.primary:hover { background: #105b59; }
.primary:disabled { opacity: .6; cursor: wait; }
.hidden { display: none; }
.form-note { margin: -2px 0 0; color: #718289; font-size: 12px; line-height: 1.45; }
.auth-message { min-height: 20px; margin-top: 17px; color: #9a421f; font-size: 13px; font-weight: 650; }
.auth-message.success { color: #176e55; }
@media (max-width: 520px) { .auth-card { padding: 27px 22px; border-radius: 14px; } }