/* ============================================================
   Auth — .auth-shell + .auth-card + login/oauth/callback
   ============================================================ */

.auth-shell {
  min-height: calc(100vh - 96px);
  width: 100%;
  display: grid;
  place-items: center;
  padding: 56px 24px;
  background:
    radial-gradient(circle at 50% 12%, color-mix(in srgb, var(--gac-lime) 12%, transparent), transparent 34%),
    radial-gradient(ellipse at 50% 100%, color-mix(in srgb, var(--gac-page-bg-2) 55%, transparent), transparent 58%);
}

.auth-card {
  position: relative;
  width: min(460px, 100%);
  padding: 36px;
  border: 1px solid var(--gac-glass-border);
  border-radius: 12px;
  background: var(--gac-glass-bg);
  box-shadow:
    inset 0 1px 1px rgba(255, 255, 255, 0.08),
    0 28px 70px var(--gac-glass-shadow);
  backdrop-filter: blur(18px) saturate(1.18);
  -webkit-backdrop-filter: blur(18px) saturate(1.18);
  overflow: hidden;
}

/* Mindloop-style dual-edge highlight (matches .gac-glass::before) */
.auth-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1.4px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.42) 0%,
    rgba(255, 255, 255, 0.14) 22%,
    rgba(255, 255, 255, 0) 42%,
    rgba(255, 255, 255, 0) 58%,
    rgba(255, 255, 255, 0.14) 78%,
    rgba(255, 255, 255, 0.42) 100%
  );
  -webkit-mask:
    linear-gradient(#fff 0 0) content-box,
    linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
}

:root[data-theme="light"] .auth-card::before {
  background: linear-gradient(
    180deg,
    rgba(15, 21, 16, 0.22) 0%,
    rgba(15, 21, 16, 0.08) 22%,
    rgba(15, 21, 16, 0) 42%,
    rgba(15, 21, 16, 0) 58%,
    rgba(15, 21, 16, 0.08) 78%,
    rgba(15, 21, 16, 0.22) 100%
  );
}

.auth-card > * {
  position: relative;
  z-index: 1;
}

.auth-card h1 {
  margin: 0 0 10px;
  color: var(--gac-text);
  font-family: var(--font-body);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0;
}

.auth-card > p {
  margin: 0 0 24px;
  color: var(--gac-muted);
  font-size: 14px;
  line-height: 1.5;
}

.auth-product-art {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  margin-bottom: 24px;
  border-radius: 8px;
  background:
    linear-gradient(145deg, var(--gac-surface-2), transparent 60%),
    url("/static/assets/landing/v3/hero-cinematic-stage.png") center/cover no-repeat;
  border: 1px solid var(--gac-glass-border);
  overflow: hidden;
}

.auth-product-art img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.auth-card > img.auth-product-art {
  object-fit: cover;
}

:root[data-theme="light"] .auth-product-art {
  background-image:
    linear-gradient(145deg, var(--gac-surface-2), transparent 60%),
    url("/static/assets/landing/v3/hero-cinematic-stage-light-ig2.png");
}

.auth-form {
  display: grid;
  gap: 14px;
}

.auth-form label {
  display: grid;
  gap: 6px;
  color: var(--gac-muted);
  font-size: 13px;
  font-weight: 600;
}

.auth-form input {
  width: 100%;
  height: 44px;
  padding: 0 14px;
  border: 1px solid var(--gac-glass-border);
  border-radius: 8px;
  background: var(--gac-field-bg);
  color: var(--gac-text);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  transition: border-color 200ms ease, box-shadow 280ms cubic-bezier(0.2, 0.7, 0.3, 1);
}

.auth-form input::placeholder { color: var(--gac-subtle); }

.auth-form input:hover {
  border-color: color-mix(in srgb, var(--gac-lime) 28%, var(--gac-glass-border));
}

.auth-form input:focus,
.auth-form input:focus-visible {
  outline: none;
  border-color: color-mix(in srgb, var(--gac-lime) 78%, transparent);
  box-shadow:
    0 0 0 4px color-mix(in srgb, var(--gac-lime) 22%, transparent),
    0 14px 30px color-mix(in srgb, var(--gac-lime) 16%, transparent);
}

.auth-actions {
  display: grid;
  gap: 12px;
  margin-top: 6px;
}

.auth-switch {
  margin-top: 16px;
  color: var(--gac-muted);
  font-size: 13px;
  text-align: center;
}

.auth-switch a {
  color: var(--gac-text);
  font-weight: 800;
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--gac-lime) 65%, transparent);
  text-underline-offset: 3px;
}

.auth-submit-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 2px;
  font-size: 13px;
  color: var(--gac-muted);
}

.auth-submit-row > * {
  flex: 1 1 160px;
}

.oauth-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  min-height: 44px;
  width: 100%;
  padding: 0 18px;
  border: 1px solid var(--gac-glass-border);
  border-radius: 8px;
  background: var(--gac-field-bg);
  color: var(--gac-text);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color 200ms ease, background 200ms ease, box-shadow 220ms ease, transform 180ms ease-out;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.oauth-button:hover {
  background: var(--gac-surface-2);
  border-color: color-mix(in srgb, var(--gac-lime) 52%, var(--gac-glass-border));
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    0 10px 24px color-mix(in srgb, var(--gac-lime) 14%, transparent);
  transform: translateY(-1px);
}

.oauth-button:focus-visible {
  outline: none;
  border-color: color-mix(in srgb, var(--gac-lime) 70%, transparent);
  box-shadow:
    0 0 0 4px color-mix(in srgb, var(--gac-lime) 22%, transparent),
    inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.oauth-icon {
  width: 20px;
  height: 20px;
  display: grid;
  place-items: center;
}

.oauth-svg {
  width: 20px;
  height: 20px;
  display: block;
}

.form-error {
  margin: 14px 0 0;
  padding: 10px 12px;
  border: 1px solid color-mix(in srgb, var(--gac-danger-text) 22%, var(--gac-glass-border));
  border-radius: 8px;
  background: var(--gac-danger-bg);
  color: var(--gac-danger-text);
  font-size: 13px;
  line-height: 1.4;
}

.form-error.subtle {
  border: 0;
  background: transparent;
  padding: 0;
  color: var(--gac-subtle);
  font-size: 12px;
}

@media (prefers-reduced-motion: reduce) {
  .auth-form input,
  .oauth-button {
    transition: none;
  }
  .oauth-button:hover {
    transform: none;
  }
}