/* ============================================================
   AUTH STYLES — BEM + CSS Custom Properties
   Theme: Geometric Minimal — Refined Identity Platform
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Mono:wght@300;400;500&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;1,9..40,300&display=swap');

/* ── Tokens ─────────────────────────────────────────────── */
:root {
  --color-bg:           #f5f4f0;
  --color-surface:      #ffffff;
  --color-surface-alt:  #f0efe9;
  --color-border:       #dddbd3;
  --color-border-focus: #1a1a1a;
  --color-text:         #1a1a1a;
  --color-text-muted:   #6e6b60;
  --color-text-faint:   #a09d93;
  --color-accent:       #c84b2f;
  --color-accent-light: #f5e8e4;
  --color-success:      #2d6a4f;
  --color-error:        #c84b2f;

  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
  --font-mono:    'DM Mono', 'Courier New', monospace;

  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  16px;
  --radius-xl:  24px;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md:  0 4px 16px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.04);
  --shadow-lg:  0 12px 40px rgba(0,0,0,.10), 0 4px 12px rgba(0,0,0,.06);

  --transition: 200ms cubic-bezier(.4,0,.2,1);
}

[data-theme="dark"] {
  --color-bg:           #111110;
  --color-surface:      #1c1c1a;
  --color-surface-alt:  #242422;
  --color-border:       #333330;
  --color-border-focus: #e8e6df;
  --color-text:         #e8e6df;
  --color-text-muted:   #8a8780;
  --color-text-faint:   #5a5854;
  --color-accent:       #e05a38;
  --color-accent-light: #2a1f1c;
  --color-success:      #52b788;

  --shadow-sm:  0 1px 3px rgba(0,0,0,.3);
  --shadow-md:  0 4px 16px rgba(0,0,0,.4);
  --shadow-lg:  0 12px 40px rgba(0,0,0,.5);
}

/* ── Reset ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100dvh;
  transition: background var(--transition), color var(--transition);
}

/* ── Layout ──────────────────────────────────────────────── */
.auth-layout {
  display: grid;
  min-height: 100dvh;
  grid-template-columns: 1fr;
  place-items: center;
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}

/* decorative grid background */
.auth-layout::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: .35;
  pointer-events: none;
  z-index: 0;
}

.auth-layout::after {
  content: '';
  position: fixed;
  top: -30%;
  right: -20%;
  width: 60vw;
  height: 60vw;
  background: radial-gradient(circle, var(--color-accent-light) 0%, transparent 70%);
  opacity: .6;
  pointer-events: none;
  z-index: 0;
}

/* ── Card ────────────────────────────────────────────────── */
.auth-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 440px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: card-in .5s cubic-bezier(.16,1,.3,1) both;
}

@keyframes card-in {
  from { opacity: 0; transform: translateY(20px) scale(.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}

.auth-card__header {
  padding: 2rem 2.25rem 0;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

.auth-card__body {
  padding: 1.75rem 2.25rem 2.25rem;
}

/* ── Brand ───────────────────────────────────────────────── */
.auth-brand {
  display: flex;
  align-items: center;
  gap: .625rem;
  text-decoration: none;
  width: fit-content;
}

.auth-brand__mark {
  width: 32px;
  height: 32px;
  background: var(--color-text);
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  flex-shrink: 0;
  transition: background var(--transition);
}

.auth-brand__mark svg {
  fill: var(--color-surface);
}

.auth-brand__name {
  font-family: var(--font-mono);
  font-size: .8125rem;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--color-text);
}

/* ── Headings ────────────────────────────────────────────── */
.auth-heading {
  font-family: var(--font-display);
  font-size: 1.875rem;
  line-height: 1.15;
  color: var(--color-text);
  letter-spacing: -.01em;
}

.auth-heading--italic {
  font-style: italic;
  color: var(--color-accent);
}

.auth-subheading {
  font-size: .9375rem;
  color: var(--color-text-muted);
  font-weight: 300;
}

/* ── Divider ─────────────────────────────────────────────── */
.auth-divider {
  display: flex;
  align-items: center;
  gap: .75rem;
  margin: 1.375rem 0;
}

.auth-divider__line {
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.auth-divider__text {
  font-size: .75rem;
  font-family: var(--font-mono);
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  white-space: nowrap;
}

/* ── Form ────────────────────────────────────────────────── */
.auth-form {
  display: flex;
  flex-direction: column;
  gap: 1.125rem;
}

/* ── Field ───────────────────────────────────────────────── */
.auth-field {
  display: flex;
  flex-direction: column;
  gap: .375rem;
}

.auth-field__label {
  font-size: .8125rem;
  font-weight: 500;
  color: var(--color-text);
  letter-spacing: .01em;
  cursor: pointer;
}

.auth-field__input-wrap {
  position: relative;
  display: flex;
  align-items: center;
}

.auth-field__input {
  width: 100%;
  padding: .75rem 1rem;
  font-family: var(--font-body);
  font-size: .9375rem;
  color: var(--color-text);
  background: var(--color-surface-alt);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  appearance: none;
  -webkit-appearance: none;
  outline: none;
}

.auth-field__input::placeholder {
  color: var(--color-text-faint);
}

.auth-field__input:hover {
  border-color: var(--color-text-muted);
}

.auth-field__input:focus {
  border-color: var(--color-border-focus);
  background: var(--color-surface);
  box-shadow: 0 0 0 3px rgba(26,26,26,.07);
}

[data-theme="dark"] .auth-field__input:focus {
  box-shadow: 0 0 0 3px rgba(232,230,223,.08);
}

.auth-field__input--has-icon {
  padding-right: 2.75rem;
}

.auth-field__icon {
  position: absolute;
  right: .875rem;
  color: var(--color-text-faint);
  display: flex;
  align-items: center;
  cursor: pointer;
  transition: color var(--transition);
  background: none;
  border: none;
  padding: 0;
  line-height: 1;
}

.auth-field__icon:hover { color: var(--color-text-muted); }

.auth-field__hint {
  font-size: .75rem;
  color: var(--color-text-faint);
}

.auth-field__error {
  font-size: .75rem;
  color: var(--color-error);
  display: flex;
  align-items: center;
  gap: .25rem;
}

/* ── Row ─────────────────────────────────────────────────── */
.auth-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  flex-wrap: wrap;
}

/* ── Checkbox ────────────────────────────────────────────── */
.auth-checkbox {
  display: flex;
  align-items: center;
  gap: .5rem;
  cursor: pointer;
}

.auth-checkbox__input {
  width: 16px;
  height: 16px;
  border: 1.5px solid var(--color-border);
  border-radius: 3px;
  background: var(--color-surface-alt);
  appearance: none;
  -webkit-appearance: none;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: border-color var(--transition), background var(--transition);
}

.auth-checkbox__input:checked {
  background: var(--color-text);
  border-color: var(--color-text);
}

.auth-checkbox__input:checked::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 4px;
  width: 5px;
  height: 8px;
  border: 2px solid var(--color-surface);
  border-top: none;
  border-left: none;
  transform: rotate(45deg);
}

.auth-checkbox__label {
  font-size: .8125rem;
  color: var(--color-text-muted);
  cursor: pointer;
  user-select: none;
}

/* ── Link ────────────────────────────────────────────────── */
.auth-link {
  font-size: .8125rem;
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition);
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.auth-link:hover {
  color: var(--color-text);
  border-color: var(--color-text);
}

.auth-link--accent {
  color: var(--color-accent);
}

.auth-link--accent:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  opacity: .85;
}

/* ── Button ──────────────────────────────────────────────── */
.auth-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  width: 100%;
  padding: .8125rem 1.25rem;
  font-family: var(--font-body);
  font-size: .9375rem;
  font-weight: 500;
  letter-spacing: .01em;
  border: 1.5px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
  outline: none;
}

.auth-btn:focus-visible {
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.auth-btn--primary {
  background: var(--color-text);
  color: var(--color-surface);
  border-color: var(--color-text);
}

.auth-btn--primary:hover {
  opacity: .88;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.auth-btn--primary:active {
  transform: translateY(0);
}

.auth-btn--secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
}

.auth-btn--secondary:hover {
  border-color: var(--color-text);
  background: var(--color-surface-alt);
}

.auth-btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border-color: transparent;
  width: auto;
  padding: .5rem .75rem;
}

.auth-btn--ghost:hover {
  color: var(--color-text);
  background: var(--color-surface-alt);
}

.auth-btn__icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ── OTP Input ───────────────────────────────────────────── */
.otp {
  display: flex;
  flex-direction: column;
  gap: 1.375rem;
}

.otp__inputs {
  display: flex;
  gap: .625rem;
  justify-content: center;
}

.otp__cell {
  width: 52px;
  height: 60px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-surface-alt);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  appearance: none;
  -webkit-appearance: none;
  outline: none;
  caret-color: var(--color-accent);
  /* Hide spinners */
  -moz-appearance: textfield;
}

.otp__cell::-webkit-outer-spin-button,
.otp__cell::-webkit-inner-spin-button { -webkit-appearance: none; }

.otp__cell:hover { border-color: var(--color-text-muted); }

.otp__cell:focus {
  border-color: var(--color-accent);
  background: var(--color-surface);
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

.otp__cell--filled {
  border-color: var(--color-border-focus);
  background: var(--color-surface);
}

.otp__separator {
  display: flex;
  align-items: center;
  color: var(--color-text-faint);
  font-size: 1rem;
  user-select: none;
}

.otp__meta {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.otp__timer {
  font-family: var(--font-mono);
  font-size: .875rem;
  color: var(--color-text-muted);
}

.otp__timer-count {
  color: var(--color-accent);
  font-weight: 500;
}

.otp__resend {
  font-size: .8125rem;
  color: var(--color-text-faint);
}

/* ── Footer ──────────────────────────────────────────────── */
.auth-footer {
  text-align: center;
  font-size: .8125rem;
  color: var(--color-text-muted);
  padding-top: 1.125rem;
  border-top: 1px solid var(--color-border);
  margin-top: .25rem;
}

/* ── Progress dots ───────────────────────────────────────── */
.auth-steps {
  display: flex;
  align-items: center;
  gap: .375rem;
  justify-content: center;
  padding-top: .25rem;
}

.auth-steps__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-border);
  transition: all var(--transition);
}

.auth-steps__dot--active {
  background: var(--color-accent);
  width: 20px;
  border-radius: 3px;
}

.auth-steps__dot--done {
  background: var(--color-text-muted);
}

/* ── Theme Toggle ────────────────────────────────────────── */
.theme-toggle {
  position: fixed;
  top: 1.25rem;
  right: 1.25rem;
  z-index: 100;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: all var(--transition);
  outline: none;
}

.theme-toggle:hover {
  color: var(--color-text);
  box-shadow: var(--shadow-md);
  transform: scale(1.05);
}

/* ── Social Buttons ──────────────────────────────────────── */
.auth-social {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .5rem;
}

.auth-social__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: .4375rem;
  padding: .5625rem .75rem;
  background: var(--color-surface-alt);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: .8125rem;
  font-weight: 500;
  color: var(--color-text);
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition);
  outline: none;
}

.auth-social__btn:hover {
  border-color: var(--color-text-muted);
  background: var(--color-surface);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm);
}

.auth-social__btn:focus-visible {
  box-shadow: 0 0 0 3px var(--color-accent-light);
}

/* ── Modal ───────────────────────────────────────────────── */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(0,0,0,.45);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s cubic-bezier(.4,0,.2,1);
}

.modal-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

.modal {
  position: relative;
  width: 100%;
  max-width: 560px;
  max-height: 85dvh;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  transform: translateY(16px) scale(.97);
  transition: transform .3s cubic-bezier(.16,1,.3,1);
  overflow: hidden;
}

.modal-backdrop.is-open .modal {
  transform: translateY(0) scale(1);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.375rem 1.625rem 1rem;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.modal__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  line-height: 1.2;
  color: var(--color-text);
}

.modal__title em { font-style: italic; color: var(--color-accent); }

.modal__close {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--color-surface-alt);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--color-text-muted);
  transition: all var(--transition);
  outline: none;
  flex-shrink: 0;
}

.modal__close:hover { color: var(--color-text); border-color: var(--color-text-muted); }
.modal__close:focus-visible { box-shadow: 0 0 0 3px var(--color-accent-light); }

.modal__body {
  overflow-y: auto;
  padding: 1.375rem 1.625rem 1.625rem;
  flex: 1;
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) transparent;
}

.modal__body::-webkit-scrollbar { width: 4px; }
.modal__body::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 2px; }

.modal__section { margin-bottom: 1.375rem; }
.modal__section:last-child { margin-bottom: 0; }

.modal__section-title {
  font-family: var(--font-mono);
  font-size: .75rem;
  font-weight: 500;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  margin-bottom: .625rem;
}

.modal__text {
  font-size: .875rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

.modal__text + .modal__text { margin-top: .625rem; }

.modal__footer {
  padding: 1rem 1.625rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: .625rem;
  justify-content: flex-end;
  flex-shrink: 0;
  background: var(--color-surface);
}

.modal__btn {
  padding: .625rem 1.25rem;
  font-family: var(--font-body);
  font-size: .875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
  outline: none;
  border: 1.5px solid transparent;
}

.modal__btn--primary {
  background: var(--color-text);
  color: var(--color-surface);
  border-color: var(--color-text);
}

.modal__btn--primary:hover { opacity: .85; }

.modal__btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border-color: var(--color-border);
}

.modal__btn--ghost:hover { color: var(--color-text); border-color: var(--color-text-muted); }

@media (max-width: 480px) {
  .modal { max-height: 92dvh; border-radius: var(--radius-lg); }
  .modal__footer { flex-direction: column-reverse; }
  .modal__btn { width: 100%; text-align: center; }
}

/* ── Password strength ───────────────────────────────────── */
.auth-strength {
  display: flex;
  gap: .25rem;
  margin-top: .375rem;
}

.auth-strength__bar {
  flex: 1;
  height: 3px;
  background: var(--color-border);
  border-radius: 2px;
  transition: background .4s ease;
}

.auth-strength__bar--weak   { background: #e05a38; }
.auth-strength__bar--fair   { background: #e09e38; }
.auth-strength__bar--good   { background: #4aab72; }
.auth-strength__bar--strong { background: var(--color-success); }

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 480px) {
  .auth-layout { padding: 1rem; align-items: flex-start; padding-top: 3.5rem; }
  .auth-card__header { padding: 1.625rem 1.625rem 0; }
  .auth-card__body   { padding: 1.5rem 1.625rem 1.75rem; }
  .auth-heading      { font-size: 1.625rem; }
  .otp__cell         { width: 44px; height: 52px; font-size: 1.25rem; gap: .4rem; }
  .auth-social       { grid-template-columns: 1fr; }
  .auth-layout::after { display: none; }
}

@media (min-width: 768px) {
  .auth-card { max-width: 460px; }
}

/* ── Utility ─────────────────────────────────────────────── */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}