/* Quantitative World: sign-in page.
   Standalone (does not load studio.css) but uses the same navy / teal palette
   so the hand-off into the studio feels continuous. */

:root {
  --navy: #0f2747;
  --navy-700: #16345c;
  --teal: #0f766e;
  --teal-600: #0d9488;
  --teal-200: #99f6e4;
  --text: #14213d;
  --muted: #52627a;
  --line: #d5dce6;
  --bg: #f7f8fa;
  --danger: #b91c1c;
  --danger-bg: #fef2f2;
  --info: #1e40af;
  --info-bg: #eff6ff;
  --radius: 10px;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.auth {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(360px, 5fr) 6fr;
}

/* --- brand panel ------------------------------------------------------- */
.auth-brand {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 40px;
  padding: 48px 56px;
  color: #e6eef8;
  background:
    radial-gradient(120% 80% at 0% 0%, rgba(13, 148, 136, .22), transparent 60%),
    linear-gradient(160deg, var(--navy) 0%, var(--navy-700) 100%);
  overflow: hidden;
}

.brand-mark {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: .01em;
  color: #fff;
}
.brand-mark svg { color: var(--teal-200); flex: none; }

.brand-copy { max-width: 26rem; margin-top: auto; }
.brand-copy h2 {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: 34px;
  font-weight: 500;
  line-height: 1.15;
  color: #fff;
}
.brand-copy p { margin: 0; color: #c3d2e6; font-size: 15.5px; }

.brand-figure { width: 100%; max-width: 440px; height: auto; margin-bottom: auto; }
.brand-foot { margin: 0; font-size: 13px; color: #9fb2cc; }

/* --- form panel -------------------------------------------------------- */
.auth-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
}

.auth-card {
  width: 100%;
  max-width: 400px;
}

.mobile-mark { display: none; }

.auth-card h1 {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 600;
  letter-spacing: -.005em;
}
.lede { margin: 0 0 28px; color: var(--muted); }

.notice {
  margin: 0 0 20px;
  padding: 12px 14px;
  border-radius: 8px;
  border-left: 4px solid;
  font-size: 14px;
}
.notice p { margin: 0; }
.notice p + p { margin-top: 4px; }
.notice-error { color: var(--danger); background: var(--danger-bg); border-color: var(--danger); }
.notice-info { color: var(--info); background: var(--info-bg); border-color: #3b82f6; }

.field { margin-bottom: 18px; }
.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 600;
}
.field input {
  width: 100%;
  padding: 11px 13px;
  font: inherit;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 8px;
  transition: border-color .15s, box-shadow .15s;
}
.field input:hover { border-color: #b3bfcf; }
.field input:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, .2);
}
.field.has-error input { border-color: var(--danger); }
.field.has-error input:focus { box-shadow: 0 0 0 3px rgba(185, 28, 28, .18); }
.field-error { margin: 6px 0 0; font-size: 13px; color: var(--danger); }

.submit {
  width: 100%;
  margin-top: 6px;
  padding: 12px 16px;
  font: 600 15px var(--sans);
  color: #fff;
  background: var(--teal);
  border: 0;
  border-radius: 8px;
  cursor: pointer;
  transition: background .15s;
}
.submit:hover { background: #0b5f59; }
.submit:focus-visible { outline: 3px solid rgba(13, 148, 136, .4); outline-offset: 2px; }

.help { margin: 22px 0 0; font-size: 13.5px; color: var(--muted); }
.legal { margin: 40px 0 0; font-size: 12.5px; color: #8392a8; }

/* --- narrow screens ---------------------------------------------------- */
@media (max-width: 880px) {
  .auth { grid-template-columns: 1fr; }
  .auth-brand { display: none; }
  .auth-panel { justify-content: flex-start; padding-top: 12vh; }
  .mobile-mark {
    display: block;
    margin-bottom: 28px;
    font-family: var(--serif);
    font-size: 20px;
    font-weight: 600;
    color: var(--navy);
  }
  .mobile-mark::before {
    content: "";
    display: inline-block;
    width: 10px; height: 10px;
    margin-right: 10px;
    border-radius: 50%;
    background: var(--teal);
    vertical-align: 1px;
  }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}