/* ------------------------------------------------------------------
   Modern Authentication Portal Styles
   - Responsive split layout
   - Accessible focus states
   - Theming via CSS variables
   - Dark mode support
------------------------------------------------------------------- */

:root {
  --brand-hue: 208; /* adjust to match corporate primary color */
  --brand-sat: 90%;
  --brand-light: 52%;
  --color-brand: hsl(var(--brand-hue) var(--brand-sat) var(--brand-light));
  --color-brand-accent: hsl(var(--brand-hue) 96% 42%);
  --color-bg: #0f1115;
  --color-bg-alt: #161b22;
  --color-surface: #ffffff;
  --color-surface-alt: #f5f7fa;
  --color-border: #d9e2ec;
  --color-border-subtle: #eef2f6;
  --color-text: #1f2933;
  --color-text-soft: #4a5568;
  --color-text-inverse: #ffffff;
  --color-danger: #d64545;
  --radius-xs: 2px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --shadow-xs: 0 1px 2px rgba(0,0,0,.06), 0 0 0 1px rgba(0,0,0,.04);
  --shadow-sm: 0 2px 4px -2px rgba(0,0,0,.1), 0 4px 6px -1px rgba(0,0,0,.1);
  --shadow-md: 0 8px 16px -4px rgba(0,0,0,.12), 0 4px 6px -2px rgba(0,0,0,.06);
  --gradient-accent: linear-gradient(135deg, var(--color-brand) 0%, var(--color-brand-accent) 100%);
  --font-stack: system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --focus-ring: 0 0 0 3px rgba(255,255,255,.9), 0 0 0 6px hsl(var(--brand-hue) 95% 40% / .65);
  --transition-fast: .15s cubic-bezier(.4,0,.2,1);
  --transition-base: .25s cubic-bezier(.4,0,.2,1);
  /* Field backgrounds */
  --field-bg: var(--color-surface-alt);
  --field-bg-focus: #ffffff; /* light mode focus */
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-surface: #1d242d;
    --color-surface-alt: #242e38;
    --color-border: #2f3a45;
    --color-border-subtle: #2a333d;
    --color-text: #f5f7fa;
    --color-text-soft: #c5ced6;
    --shadow-xs: 0 1px 2px rgba(0,0,0,.4), 0 0 0 1px rgba(255,255,255,.05);
    --shadow-sm: 0 4px 8px -2px rgba(0,0,0,.5), 0 2px 4px -2px rgba(0,0,0,.4);
    --shadow-md: 0 10px 24px -4px rgba(0,0,0,.55), 0 6px 12px -2px rgba(0,0,0,.4);
  --field-bg: #2b343e; /* darker base for inputs */
  --field-bg-focus: #323d48; /* subtle change on focus maintaining contrast */
  }
}

html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
body {
  font-family: var(--font-stack);
  -webkit-font-smoothing: antialiased;
  background: radial-gradient(circle at 25% 25%, hsl(var(--brand-hue) 50% 14%), #07090d 65%) fixed;
  color: var(--color-text);
  line-height: 1.5;
  font-size: 16px;
  display: flex;
  align-items: stretch;
  min-height: 100vh;
}

.auth-shell {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 520px) 1fr;
  background: linear-gradient(120deg, rgba(255,255,255,.06), rgba(255,255,255,0) 40%);
}

@media (max-width: 980px) {
  .auth-shell { grid-template-columns: 1fr; }
  .brand-panel { display: none; }
}

.brand-panel {
  position: relative;
  background: var(--gradient-accent);
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 3rem 2.5rem;
  overflow: hidden;
  isolation: isolate;
}
.brand-panel::before,
.brand-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 20%, rgba(255,255,255,.18), transparent 60%),
    radial-gradient(circle at 80% 70%, rgba(255,255,255,.15), transparent 70%);
  mix-blend-mode: screen;
  pointer-events: none;
}
.brand-inner { max-width: 420px; text-align: center; }
.brand-logo { max-width: 400px; width: 60%; height: auto; filter: drop-shadow(0 4px 8px rgba(0,0,0,.25)); }
.brand-title { font-size: clamp(1.9rem, 3vw, 2.6rem); margin: 1.25rem 0 .5rem; font-weight: 600; letter-spacing: .5px; }
.brand-tagline { font-size: .95rem; opacity: .92; margin: 0 auto 1rem; line-height: 1.4; }

.form-panel {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(2rem, 6vh, 4rem) clamp(1.25rem, 4vw, 3.5rem) 3rem;
}

.auth-form {
  background: var(--color-surface);
  width: 100%;
  max-width: 420px;
  border-radius: var(--radius-lg);
  padding: 2.25rem 2.25rem 2rem;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}
.auth-form::before {
  content: "";
  position: absolute;
  top: -40%; left: -20%;
  width: 140%; height: 140%;
  background: radial-gradient(circle at 35% 45%, rgba(0,150,255,.10), transparent 60%);
  pointer-events: none;
  z-index: 0;
}
.auth-form > * { position: relative; z-index: 1; }
.form-header { margin-bottom: 1.5rem; }
.form-header h2 { margin: 0 0 .35rem; font-size: 1.65rem; font-weight: 600; letter-spacing: .5px; }
.form-sub { margin: 0; color: var(--color-text-soft); font-size: .9rem; }

.field-group { display: flex; flex-direction: column; margin-bottom: 1.15rem; }
.field-group.inline { flex-direction: row; align-items: center; }
.field-group.inline .checkbox { display: inline-flex; gap: .6rem; align-items: center; font-size: .85rem; }
.field-group label { font-size: .85rem; font-weight: 600; text-transform: uppercase; letter-spacing: .7px; margin-bottom: .45rem; color: var(--color-text-soft); }
.field-hint { font-size: .7rem; color: var(--color-text-soft); margin-top: .4rem; opacity: .85; }

.pw-wrapper { position: relative; display: flex; align-items: stretch; }
.pw-wrapper input { flex: 1; }
.pw-toggle { position: absolute; right: .35rem; top: 50%; transform: translateY(-50%); background: none; border: none; font-size: .7rem; font-weight: 600; letter-spacing: .5px; padding: .4rem .55rem; border-radius: var(--radius-sm); cursor: pointer; color: var(--color-brand-accent); text-transform: uppercase; }
.pw-toggle:hover { background: rgba(0,0,0,.05); }

input[type=text], input[type=password], input[type=email] {
  font: 500 0.9rem/1.2 var(--font-stack);
  padding: .85rem .85rem .85rem .9rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--field-bg);
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}
input[type=text]::placeholder, input[type=password]::placeholder { color: var(--color-text-soft); opacity: .6; }
input[type=text]:focus, input[type=password]:focus {
  outline: none;
  border-color: var(--color-brand-accent);
  box-shadow: 0 0 0 1px var(--color-brand-accent), 0 0 0 4px hsl(var(--brand-hue) 95% 46% / .25);
  background: var(--field-bg-focus);
}

.checkbox input { accent-color: var(--color-brand-accent); width: 1rem; height: 1rem; }

.actions { margin-top: .75rem; display: flex; justify-content: flex-end; gap: .75rem; align-items: center; }
.btn { --btn-bg: var(--color-brand-accent); --btn-color: #fff; font: 600 .85rem/1 var(--font-stack); letter-spacing: .75px; padding: .95rem 1.35rem; border-radius: var(--radius-md); border: none; cursor: pointer; position: relative; overflow: hidden; display: inline-flex; align-items: center; gap: .5rem; text-transform: uppercase; }
.btn.primary { background: var(--gradient-accent); color: var(--btn-color); box-shadow: 0 4px 12px -2px hsl(var(--brand-hue) 90% 42% / .4), 0 2px 4px -1px rgba(0,0,0,.3); }
.btn.primary::before { content: ""; position: absolute; inset: 0; background: linear-gradient(120deg, transparent, rgba(255,255,255,.22), transparent); transform: translateX(-100%); transition: transform .7s ease; }
.btn.primary:hover::before { transform: translateX(100%); }
.btn.primary:hover { filter: brightness(1.07); }
.btn:focus-visible { outline: none; box-shadow: var(--focus-ring); }
.btn:active { transform: translateY(1px); }

.security-note { display: flex; align-items: flex-start; gap: .6rem; font-size: .68rem; margin-top: 1.4rem; line-height: 1.3; color: var(--color-text-soft); background: linear-gradient(90deg, var(--color-surface-alt), transparent); padding: .65rem .75rem; border-radius: var(--radius-sm); border: 1px solid var(--color-border-subtle); }
.security-note .ic { width: 18px; height: 18px; fill: var(--color-brand-accent); flex: 0 0 auto; }

.support-note { margin-top: 1.75rem; font-size: .72rem; text-align: center; color: var(--color-text-soft); }
.support-note b { color: var(--color-brand-accent); font-weight: 600; }

.noscript-warning { background: #fffae6; color: #7a5d00; border: 1px solid #f5d97b; padding: .75rem 1rem; font-size: .8rem; text-align: center; }

/* Utility classes */
.sr-only { position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); border:0; }

/* Reduce motion for users who prefer it */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}

/* High contrast adjustments (example) */
@media (forced-colors: active) {
  .btn.primary { border: 1px solid ButtonText; }
  input[type=text], input[type=password] { border-color: GrayText; background: Canvas; }
}