/* =========================================================
   BinBuddy — Login page styles
   ========================================================= */

.auth-shell {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  background: var(--bb-bg);
}

.auth-side {
  position: relative;
  background: var(--bb-grad-hero);
  color: #fff;
  padding: var(--sp-10);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  isolation: isolate;
}
.auth-side::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle 500px at 20% 20%, rgba(22,163,74,0.35), transparent 70%),
    radial-gradient(circle 600px at 80% 90%, rgba(13,93,255,0.45), transparent 70%);
  z-index: -1;
}
.auth-side::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 30% 50%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 30% 50%, #000 30%, transparent 80%);
  z-index: -1;
}

.auth-side .brand { color: #fff; z-index: 2; position: relative; }
.auth-side__hero {
  max-width: 480px;
  position: relative;
  z-index: 2;
}
.auth-side__hero h2 {
  color: #fff;
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  margin-bottom: var(--sp-4);
}
.auth-side__hero p {
  color: rgba(255,255,255,0.8);
  font-size: var(--bb-text-lg);
  margin-bottom: var(--sp-8);
}

.auth-side__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}
.auth-side__list li {
  display: flex;
  gap: var(--sp-3);
  align-items: flex-start;
  color: rgba(255,255,255,0.92);
}
.auth-side__list svg {
  width: 22px; height: 22px;
  color: #55d387;
  flex-shrink: 0;
  margin-top: 2px;
}

.auth-footer-note {
  font-size: var(--bb-text-xs);
  color: rgba(255,255,255,0.55);
  position: relative;
  z-index: 2;
}

.auth-main {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--sp-10);
  position: relative;
}

.auth-card {
  width: 100%;
  max-width: 440px;
  padding: var(--sp-10);
  background: #fff;
  border-radius: var(--r-xl);
  border: 1px solid var(--bb-ink-200);
  box-shadow: var(--sh-lg);
}

.auth-tabs {
  display: flex;
  gap: var(--sp-1);
  padding: 4px;
  background: var(--bb-ink-100);
  border-radius: var(--r-pill);
  margin-bottom: var(--sp-8);
}
.auth-tab {
  flex: 1;
  padding: var(--sp-2) var(--sp-4);
  font-size: var(--bb-text-sm);
  font-weight: 600;
  color: var(--bb-ink-500);
  border-radius: var(--r-pill);
  transition: all var(--dur-fast) var(--ease-out);
}
.auth-tab.is-active {
  background: #fff;
  color: var(--bb-ink-900);
  box-shadow: var(--sh-xs);
}

.auth-card h1 {
  font-size: var(--bb-text-3xl);
  margin-bottom: var(--sp-2);
}
.auth-card .auth-sub {
  color: var(--bb-ink-500);
  font-size: var(--bb-text-sm);
  margin-bottom: var(--sp-8);
}

.field {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
  margin-bottom: var(--sp-5);
}
.field label {
  font-size: var(--bb-text-sm);
  font-weight: 600;
  color: var(--bb-ink-800);
}
.field__control {
  position: relative;
}
.field input {
  width: 100%;
  padding: 14px 16px 14px 44px;
  font-family: inherit;
  font-size: var(--bb-text-base);
  color: var(--bb-ink-900);
  background: var(--bb-ink-50);
  border: 1px solid var(--bb-ink-200);
  border-radius: var(--r-md);
  transition: all var(--dur-fast) var(--ease-out);
  outline: none;
}
.field input::placeholder { color: var(--bb-ink-400); }
.field input:focus {
  background: #fff;
  border-color: var(--bb-blue-400);
  box-shadow: 0 0 0 4px rgba(13,93,255,0.12);
}
.field__icon {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--bb-ink-400);
  pointer-events: none;
}
.field__icon svg { width: 20px; height: 20px; }

.field__toggle {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--bb-ink-400);
  padding: 6px;
  border-radius: 8px;
}
.field__toggle:hover { color: var(--bb-ink-700); background: var(--bb-ink-100); }
.field__toggle svg { width: 18px; height: 18px; }

.auth-options {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--sp-6);
  font-size: var(--bb-text-sm);
}

.checkbox {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  cursor: pointer;
  color: var(--bb-ink-600);
}
.checkbox input { position: absolute; opacity: 0; pointer-events: none; }
.checkbox .box {
  width: 18px; height: 18px;
  border-radius: 6px;
  border: 1.5px solid var(--bb-ink-300);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all var(--dur-fast) var(--ease-out);
}
.checkbox input:checked + .box {
  background: var(--bb-blue-600);
  border-color: var(--bb-blue-600);
}
.checkbox input:checked + .box::after {
  content: '';
  width: 6px; height: 10px;
  border-right: 2px solid #fff;
  border-bottom: 2px solid #fff;
  transform: rotate(45deg) translate(-1px, -1px);
}

.auth-submit {
  width: 100%;
  padding: var(--sp-4);
  font-size: var(--bb-text-base);
  margin-bottom: var(--sp-5);
}

.auth-alt {
  text-align: center;
  font-size: var(--bb-text-sm);
  color: var(--bb-ink-500);
}
.auth-alt a { font-weight: 600; }

.auth-divider {
  display: flex;
  align-items: center;
  gap: var(--sp-3);
  margin: var(--sp-5) 0;
  color: var(--bb-ink-400);
  font-size: var(--bb-text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.auth-divider::before,
.auth-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--bb-ink-200);
}

.auth-demo {
  padding: var(--sp-4);
  background: var(--bb-blue-50);
  border: 1px solid var(--bb-blue-100);
  border-radius: var(--r-md);
  font-size: var(--bb-text-sm);
  color: var(--bb-blue-800);
  margin-bottom: var(--sp-5);
}
.auth-demo strong { display: block; font-size: var(--bb-text-xs); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: var(--sp-1); color: var(--bb-blue-700); }
.auth-demo code {
  display: inline-block;
  padding: 2px 6px;
  background: #fff;
  border-radius: 4px;
  font-family: var(--bb-font-mono);
  font-size: var(--bb-text-xs);
  color: var(--bb-blue-900);
}

.auth-back {
  position: absolute;
  top: var(--sp-6);
  left: var(--sp-6);
  font-size: var(--bb-text-sm);
  color: var(--bb-ink-500);
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
}
.auth-back:hover { color: var(--bb-ink-900); }

.auth-error {
  padding: var(--sp-3) var(--sp-4);
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: #b91c1c;
  border-radius: var(--r-md);
  font-size: var(--bb-text-sm);
  margin-bottom: var(--sp-4);
  display: none;
  align-items: center;
  gap: var(--sp-2);
  animation: shake 0.4s var(--ease-out);
}
.auth-error.is-visible { display: flex; }
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

.auth-success {
  padding: var(--sp-3) var(--sp-4);
  background: var(--bb-green-50);
  border: 1px solid var(--bb-green-100);
  color: var(--bb-green-700);
  border-radius: var(--r-md);
  font-size: var(--bb-text-sm);
  margin-bottom: var(--sp-4);
  display: none;
  align-items: center;
  gap: var(--sp-2);
}
.auth-success.is-visible { display: flex; }

@media (max-width: 860px) {
  .auth-shell { grid-template-columns: 1fr; }
  .auth-side { display: none; }
  .auth-main { padding: var(--sp-6); }
  .auth-card { padding: var(--sp-8) var(--sp-6); }
  .auth-back { top: var(--sp-4); left: var(--sp-4); }
}