/* ============================================================
   Forge portal · auth split layout (Login · Register · Forgot · Reset)
   Spec: forge.pen frames nS45E (Login) · oDUwE (Register) ·
         RgQzq (Forgot) · ADq0d (Reset) · sz4B1 (Check Email)
   Layout: 600px brand panel · fill-container form panel · 900h
   ============================================================ */

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: var(--forge-font-sans);
  font-size: var(--forge-fs-body);
  color: var(--forge-text);
  background: var(--forge-ink-800);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: 0; padding: 0; }
img, svg { display: block; max-width: 100%; }
ul { list-style: none; margin: 0; padding: 0; }
:focus-visible { outline: 2px solid var(--forge-accent); outline-offset: 2px; border-radius: 4px; }

/* ---------------- shell ---------------- */
.auth-shell {
  display: flex;
  min-height: 100vh;
  background: var(--forge-ink-800);
}

/* ---------------- brand panel (left) ---------------- */
.auth-brand {
  position: relative;
  width: 600px;
  flex-shrink: 0;
  background: var(--forge-ink-800);
  border-right: 1px solid rgba(255,255,255,0.06);
  padding: var(--forge-sp-12);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  overflow: hidden;
  color: var(--forge-text-on-dark);
}
.auth-brand::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.07) 1px, transparent 1px);
  background-size: 28px 28px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 90% 70% at 30% 50%, #000 30%, transparent 90%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 30% 50%, #000 30%, transparent 90%);
}
.auth-brand::after {
  content: "";
  position: absolute;
  bottom: -120px;
  right: -80px;
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(242,144,48,0.22) 0%, transparent 70%);
  filter: blur(60px);
  pointer-events: none;
  animation: brandGlow 14s ease-in-out infinite;
}
@keyframes brandGlow {
  0%, 100% { transform: translate(0, 0) scale(1);    opacity: 1;    }
  50%      { transform: translate(20px, -30px) scale(1.1); opacity: 0.85; }
}
.auth-brand > * { position: relative; z-index: 1; }

.auth-brand__top {
  display: flex;
  align-items: flex-end;
  gap: 5px;
}
.auth-brand__lockup {
  display: inline-flex;
  align-items: flex-end;
  gap: 4px;
}
.auth-brand__lockup img { height: 36px; width: auto; }

.auth-brand__mid {
  display: flex;
  flex-direction: column;
  gap: var(--forge-sp-6);
  max-width: 480px;
}
.auth-brand__eyebrow {
  font-size: var(--forge-fs-caption);
  font-weight: var(--forge-fw-bold);
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--forge-accent);
}
.auth-brand__title {
  font-size: 60px;
  font-weight: var(--forge-fw-bold);
  letter-spacing: -2.4px;
  line-height: 1;
  color: var(--forge-text-on-dark);
  margin: 0;
}
.auth-brand__sub {
  font-size: 15px;
  line-height: 1.6;
  color: rgba(255,255,255,0.7);
  margin: 0;
  max-width: 460px;
}

/* quote card */
.auth-brand__quote {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 14px;
  padding: var(--forge-sp-6);
  display: flex;
  flex-direction: column;
  gap: var(--forge-sp-3);
  color: var(--forge-text-on-dark);
}
.auth-brand__quote .quote-icon {
  width: 18px; height: 18px;
  color: var(--forge-accent);
}
.auth-brand__quote p {
  font-size: 14px;
  font-weight: var(--forge-fw-medium);
  line-height: 1.55;
  margin: 0;
}
.auth-brand__quote .who {
  display: flex;
  align-items: center;
  gap: var(--forge-sp-2);
  font-size: 12px;
  color: rgba(255,255,255,0.7);
}
.auth-brand__quote .who .av {
  width: 24px; height: 24px;
  border-radius: 999px;
  background: var(--forge-accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: var(--forge-fw-bold);
  color: var(--forge-text-on-accent);
}

/* perks list (Register) */
.auth-brand__perks {
  display: flex;
  flex-direction: column;
  gap: var(--forge-sp-3);
}
.auth-brand__perks li {
  display: flex;
  align-items: center;
  gap: var(--forge-sp-3);
  font-size: 13px;
  font-weight: var(--forge-fw-medium);
  color: var(--forge-text-on-dark);
}
.auth-brand__perks .ic {
  width: 24px; height: 24px;
  border-radius: 6px;
  background: rgba(242,144,48,0.14);
  color: var(--forge-accent);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.auth-brand__perks .ic svg { width: 14px; height: 14px; }

/* ---------------- form panel (right) ---------------- */
.auth-form {
  flex: 1;
  background: var(--forge-bg);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: var(--forge-sp-12);
  gap: var(--forge-sp-8);
}
.auth-form__top {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--forge-sp-3);
  font-size: 13px;
  color: var(--forge-text-muted);
}
.auth-form__top .switch-link {
  display: inline-flex;
  align-items: center;
  gap: var(--forge-sp-2);
  padding: 6px 12px;
  background: var(--forge-surface);
  border: 1px solid var(--forge-border);
  border-radius: var(--forge-r-md);
  font-size: 13px;
  font-weight: var(--forge-fw-semibold);
  color: var(--forge-ink-800);
  transition: background 120ms ease, border-color 120ms ease, transform 120ms ease;
}
.auth-form__top .switch-link svg { width: 13px; height: 13px; }
.auth-form__top .switch-link:hover { background: var(--forge-surface-muted); transform: translateY(-1px); border-color: var(--forge-border-strong); }

.auth-form__wrap {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}
.auth-form__inner {
  width: 100%;
  max-width: 440px;
  display: flex;
  flex-direction: column;
  gap: var(--forge-sp-6);
}
.auth-form__head h1 {
  font-size: 32px;
  font-weight: var(--forge-fw-bold);
  letter-spacing: -0.8px;
  line-height: 1.1;
  color: var(--forge-ink-800);
  margin: 0 0 var(--forge-sp-2);
}
.auth-form__head p {
  font-size: 14px;
  color: var(--forge-text-muted);
  line-height: 1.5;
  margin: 0;
}

/* fields */
.f-fields {
  display: flex;
  flex-direction: column;
  gap: var(--forge-sp-4);
}
.f-fields--tight { gap: var(--forge-sp-3); }

.f-field {
  display: flex;
  flex-direction: column;
  gap: var(--forge-sp-2);
}
.f-label {
  font-size: 12px;
  font-weight: var(--forge-fw-semibold);
  letter-spacing: 0.3px;
  color: var(--forge-text-muted);
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.f-label .hint {
  font-size: 12px;
  font-weight: var(--forge-fw-medium);
  color: var(--forge-text-dim);
}
.f-label a {
  font-size: 12px;
  color: var(--forge-accent);
  font-weight: var(--forge-fw-semibold);
  letter-spacing: 0;
  text-transform: none;
}
.f-label a:hover { color: var(--forge-accent-hover); }
.f-input {
  display: flex;
  align-items: center;
  gap: var(--forge-sp-2);
  padding: var(--forge-sp-3);
  background: var(--forge-surface);
  border: 1.5px solid var(--forge-border);
  border-radius: var(--forge-r-md);
  transition: border-color 160ms ease, box-shadow 160ms ease;
}
.f-input:focus-within {
  border-color: var(--forge-accent);
  box-shadow: 0 0 0 3px rgba(242,144,48,0.18);
}
.f-input.is-invalid {
  border-color: var(--forge-danger);
  box-shadow: 0 0 0 3px rgba(220,38,38,0.12);
}
.f-input input {
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  font: inherit;
  font-size: 14px;
  color: var(--forge-ink-800);
  min-width: 0;
}
.f-input input::placeholder { color: #c4c8d0; }
.f-input .pwd-toggle {
  width: 28px; height: 28px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 6px;
  color: var(--forge-text-dim);
  transition: color 120ms ease, background 120ms ease;
}
.f-input .pwd-toggle:hover { color: var(--forge-text-muted); background: rgba(0,0,0,0.04); }
.f-input .pwd-toggle svg { width: 16px; height: 16px; }

.f-help {
  font-size: 12px;
  color: var(--forge-text-dim);
}
.f-help.is-error { color: var(--forge-danger); }

/* checkbox */
.f-check {
  display: inline-flex;
  align-items: flex-start;
  gap: var(--forge-sp-2);
  cursor: pointer;
  user-select: none;
}
.f-check input { position: absolute; opacity: 0; pointer-events: none; }
.f-check .box {
  width: 18px; height: 18px;
  border-radius: 5px;
  border: 1.5px solid var(--forge-border-strong);
  background: var(--forge-surface);
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
  transition: background 140ms ease, border-color 140ms ease;
}
.f-check .box svg { width: 12px; height: 12px; color: var(--forge-text-on-accent); opacity: 0; transform: scale(0.6); transition: opacity 140ms ease, transform 140ms ease; }
.f-check input:checked + .box { background: var(--forge-accent); border-color: var(--forge-accent); }
.f-check input:checked + .box svg { opacity: 1; transform: scale(1); }
.f-check span:last-child {
  font-size: 13px;
  font-weight: var(--forge-fw-medium);
  color: var(--forge-ink-800);
  line-height: 1.55;
}
.f-check.muted span:last-child { color: var(--forge-text-muted); font-weight: var(--forge-fw-medium); font-size: 12px; }

/* password strength */
.f-strength {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.f-strength__bars {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 4px;
}
.f-strength__bar {
  height: 4px;
  background: var(--forge-neutral-200);
  border-radius: 999px;
  transition: background 200ms ease;
}
.f-strength__label {
  font-size: 11px;
  font-weight: var(--forge-fw-medium);
  color: var(--forge-text-dim);
  display: flex;
  justify-content: space-between;
}
.f-strength[data-score="1"] .f-strength__bar:nth-child(-n+1) { background: var(--forge-danger); }
.f-strength[data-score="2"] .f-strength__bar:nth-child(-n+2) { background: var(--forge-warning); }
.f-strength[data-score="3"] .f-strength__bar:nth-child(-n+3) { background: #B8860B; }
.f-strength[data-score="4"] .f-strength__bar:nth-child(-n+4) { background: var(--forge-success); }
.f-strength[data-score="1"] .f-strength__label { color: var(--forge-danger); }
.f-strength[data-score="2"] .f-strength__label { color: var(--forge-warning); }
.f-strength[data-score="3"] .f-strength__label { color: #B8860B; }
.f-strength[data-score="4"] .f-strength__label { color: var(--forge-success); }

/* submit + ghost ctas */
.f-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--forge-sp-2);
  padding: var(--forge-sp-3) var(--forge-sp-5);
  background: var(--forge-accent);
  color: var(--forge-text-on-accent);
  border-radius: var(--forge-r-md);
  font-size: 14px;
  font-weight: var(--forge-fw-semibold);
  border: 0;
  cursor: pointer;
  width: 100%;
  box-shadow: 0 8px 24px rgba(242,144,48,0.25);
  transition: background 160ms ease, transform 100ms ease, box-shadow 160ms ease;
}
.f-submit svg { width: 14px; height: 14px; transition: transform 160ms ease; }
.f-submit:hover:not(:disabled) {
  background: var(--forge-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 12px 32px rgba(242,144,48,0.35);
}
.f-submit:hover:not(:disabled) svg { transform: translateX(3px); }
.f-submit:active { transform: translateY(0); }
.f-submit:disabled { opacity: 0.7; cursor: not-allowed; box-shadow: none; }
.f-submit.is-loading .label { opacity: 0.7; }
.f-submit .spinner {
  display: none;
  width: 14px; height: 14px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
.f-submit.is-loading .spinner { display: inline-block; }
.f-submit.is-loading .icon { display: none; }
@keyframes spin { to { transform: rotate(360deg); } }

/* divider */
.f-divider {
  display: flex;
  align-items: center;
  gap: var(--forge-sp-3);
  color: var(--forge-text-dim);
  font-size: 10px;
  font-weight: var(--forge-fw-bold);
  letter-spacing: 1.5px;
}
.f-divider::before,
.f-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--forge-border);
}

/* SSO buttons */
.f-sso {
  display: flex;
  flex-direction: column;
  gap: var(--forge-sp-2);
}
.f-sso button,
.f-sso a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--forge-sp-2);
  padding: var(--forge-sp-3) var(--forge-sp-4);
  background: var(--forge-surface);
  border: 1px solid var(--forge-border);
  border-radius: var(--forge-r-md);
  font-size: 13px;
  font-weight: var(--forge-fw-semibold);
  color: var(--forge-ink-800);
  width: 100%;
  transition: background 120ms ease, border-color 120ms ease, transform 120ms ease;
}
.f-sso button:hover,
.f-sso a:hover { background: var(--forge-surface-muted); border-color: var(--forge-border-strong); }
.f-sso button:disabled {
  opacity: 0.55; cursor: not-allowed;
}
.f-sso .ic { width: 16px; height: 16px; flex-shrink: 0; }
.f-sso .badge {
  margin-left: auto;
  font-size: 9px;
  font-weight: var(--forge-fw-bold);
  letter-spacing: 1.2px;
  background: var(--forge-neutral-100);
  color: var(--forge-text-muted);
  padding: 2px 8px;
  border-radius: 999px;
}

/* error box */
.f-error {
  display: none;
  align-items: center;
  gap: var(--forge-sp-2);
  padding: 10px 14px;
  background: var(--forge-danger-soft);
  border: 1px solid rgba(220,38,38,0.2);
  border-radius: var(--forge-r-md);
  font-size: 13px;
  color: var(--forge-danger);
}
.f-error.is-show { display: flex; }
.f-error svg { width: 14px; height: 14px; flex-shrink: 0; }

/* shake */
.is-shake { animation: shake 0.4s cubic-bezier(.36,.07,.19,.97) both; }
@keyframes shake {
  10%, 90% { transform: translateX(-2px); }
  20%, 80% { transform: translateX(6px); }
  30%, 50%, 70% { transform: translateX(-8px); }
  40%, 60% { transform: translateX(8px); }
}

/* footer */
.auth-form__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--forge-sp-3);
}
.auth-form__lang {
  display: inline-flex;
  background: var(--forge-surface);
  border: 1px solid var(--forge-border);
  border-radius: 8px;
  padding: 3px;
  gap: 2px;
}
.auth-form__lang a {
  padding: 5px 11px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: var(--forge-fw-semibold);
  color: var(--forge-text-muted);
  transition: background 120ms ease, color 120ms ease;
}
.auth-form__lang a.is-active {
  background: var(--forge-ink-800);
  color: var(--forge-text-on-dark);
}
.auth-form__legal {
  display: inline-flex;
  gap: var(--forge-sp-4);
  font-size: 12px;
  color: var(--forge-text-muted);
}
.auth-form__legal a { transition: color 120ms ease; }
.auth-form__legal a:hover { color: var(--forge-ink-800); }

/* ---------------- entrance animations ---------------- */
.auth-brand__top   { animation: fadeUp 600ms ease both; }
.auth-brand__mid   { animation: fadeUp 700ms ease 100ms both; }
.auth-brand__quote,
.auth-brand__perks { animation: fadeUp 700ms ease 200ms both; }
.auth-form__wrap   { animation: fadeIn 600ms ease 150ms both; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

/* ---------------- responsive ---------------- */
@media (max-width: 980px) {
  .auth-shell { flex-direction: column; min-height: 100svh; }
  .auth-brand {
    width: 100%;
    border-right: 0;
    border-bottom: 1px solid rgba(255,255,255,0.06);
    padding: var(--forge-sp-12) var(--forge-sp-6) var(--forge-sp-8);
    gap: var(--forge-sp-8);
  }
  .auth-brand__title { font-size: 40px; letter-spacing: -1.6px; }
  .auth-brand__sub { font-size: 14px; }
  .auth-brand__quote { display: none; }
  .auth-brand__perks { flex-direction: row; flex-wrap: wrap; }
  .auth-brand__perks li { font-size: 12px; padding: 6px 12px; background: rgba(255,255,255,0.04); border: 1px solid rgba(255,255,255,0.08); border-radius: 999px; }
  .auth-form {
    background: var(--forge-bg);
    border-radius: 24px 24px 0 0;
    padding: var(--forge-sp-8) var(--forge-sp-5);
    margin-top: -16px;
  }
  .auth-form__top { justify-content: space-between; }
  .auth-form__inner { max-width: 100%; }
  .auth-form__head h1 { font-size: 24px; }
  .f-input input { font-size: 16px; } /* prevent iOS auto-zoom */
}

@media (prefers-reduced-motion: reduce) {
  .auth-brand::after,
  .auth-brand__top, .auth-brand__mid, .auth-brand__quote, .auth-brand__perks, .auth-form__wrap {
    animation: none !important;
  }
}