/* ============================================================
   omni-zenkai — Modern SaaS Authentication Flow CSS
   /src/css/login.css
   ============================================================ */

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

.hidden {
  display: none !important;
}

:root {
  /* Backgrounds */
  --clr-bg:           #080b14;
  --clr-surface:      rgba(255, 255, 255, 0.03);
  --clr-surface-md:   rgba(255, 255, 255, 0.06);

  /* Borders */
  --clr-border:       rgba(255, 255, 255, 0.07);
  --clr-border-hover: rgba(255, 255, 255, 0.14);

  /* Accents */
  --clr-accent:       #6366f1;
  --clr-accent-light: #818cf8;
  --clr-accent-dark:  #4f46e5;
  --clr-accent-glow:  rgba(99, 102, 241, 0.3);
  --clr-violet:       #8b5cf6;

  /* Semantic */
  --clr-success:      #10b981;
  --clr-success-bg:   rgba(16, 185, 129, 0.12);
  --clr-error:        #ef4444;
  --clr-error-bg:     rgba(239, 68, 68, 0.12);
  --clr-warn:         #f59e0b;

  /* Text colors */
  --clr-text-primary:   #f1f5f9;
  --clr-text-secondary: #94a3b8;
  --clr-text-muted:     #475569;

  /* Shape tokens */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Motion */
  --ease:      cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out:  cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur:       220ms;
  --dur-slow:  380ms;

  /* Typography */
  --font-sans:    'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Space Grotesk', 'Inter', sans-serif;
}

body {
  font-family: var(--font-sans);
  background: var(--clr-bg);
  color: var(--clr-text-primary);
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

#app-root {
  position: relative;
  z-index: 1;
  width: 100%;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
}

/* ── Ambient Backgrounds ────────────────────────────────────── */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: 0;
}

.bg-orb {
  position: fixed;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  z-index: 0;
  animation: orb-drift 14s var(--ease) infinite alternate;
}

.bg-orb--1 {
  width: 450px; height: 450px;
  top: -100px; left: -100px;
  background: radial-gradient(circle, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
  animation-duration: 16s;
}

.bg-orb--2 {
  width: 400px; height: 400px;
  bottom: -80px; right: -80px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.12) 0%, transparent 70%);
  animation-duration: 12s;
  animation-delay: -4s;
}

.bg-orb--3 {
  width: 300px; height: 300px;
  top: 40%; left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, rgba(16, 185, 129, 0.06) 0%, transparent 75%);
  animation: none;
}

@keyframes orb-drift {
  from { transform: translate(0, 0) scale(1); opacity: 0.75; }
  to   { transform: translate(40px, 30px) scale(1.06); opacity: 0.95; }
}

/* ── Layout ────────────────────────────────────────────────── */
.login-layout {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  animation: card-appear var(--dur-slow) var(--ease-out) forwards;
}

@keyframes card-appear {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.login-card-container {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

/* ── Brand Header ────────────────────────────────────────── */
.brand-header {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo__icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.08), 0 0 24px var(--clr-accent-glow);
}

.brand-logo__icon svg {
  display: block;
  width: 100%;
  height: 100%;
}

.brand-logo__name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--clr-text-primary);
}

.brand-logo__name strong {
  font-weight: 800;
  color: var(--clr-accent-light);
}

.brand-tagline {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--clr-text-secondary);
}

/* ── Glassmorphic Panel ───────────────────────────────────── */
.auth-form-panel {
  background: var(--clr-surface);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: 2.25rem 2rem;
  box-shadow: 
    0 15px 35px rgba(0, 0, 0, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.05);
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  transition: border-color var(--dur) var(--ease);
}

.auth-form-panel:hover {
  border-color: var(--clr-border-hover);
}

.form-header {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.form-header__title {
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #f1f5f9 0%, #94a3b8 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.form-header__sub {
  font-size: 0.85rem;
  color: var(--clr-text-secondary);
  line-height: 1.4;
}

/* ── Language Switcher Dropdown ────────────────────────── */
.login-lang-container {
  position: absolute;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 100;
}

/* When RTL, position language dropdown on the left */
html[dir="rtl"] .login-lang-container {
  right: auto;
  left: 1.5rem;
}

.btn-lang {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  color: var(--clr-text-secondary);
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.btn-lang:hover, .btn-lang[aria-expanded="true"] {
  border-color: var(--clr-accent-light);
  color: var(--clr-text-primary);
  background: var(--clr-surface-md);
}

.dropdown-menu {
  position: absolute;
  top: 105%;
  right: 0;
  background: #0f131f;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-sm);
  min-width: 120px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.4);
  display: flex;
  flex-direction: column;
  padding: 4px;
  animation: dropdown-in var(--dur) var(--ease) forwards;
}

html[dir="rtl"] .dropdown-menu {
  right: auto;
  left: 0;
}

@keyframes dropdown-in {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.dropdown-item {
  background: transparent;
  border: none;
  padding: 0.5rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--clr-text-secondary);
  text-align: left;
  cursor: pointer;
  border-radius: calc(var(--radius-sm) - 2px);
  width: 100%;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

html[dir="rtl"] .dropdown-item {
  text-align: right;
}

.dropdown-item:hover {
  background: var(--clr-surface-md);
  color: var(--clr-text-primary);
}

/* ── Mode Toggle Tabs ──────────────────────────────────────── */
.mode-toggle {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  padding: 4px;
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
}

.mode-toggle__btn {
  position: relative;
  z-index: 2;
  padding: 0.625rem 0.75rem;
  font-size: 0.85rem;
  font-weight: 600;
  font-family: var(--font-sans);
  color: var(--clr-text-secondary);
  background: transparent;
  border: none;
  border-radius: calc(var(--radius-md) - 4px);
  cursor: pointer;
  transition: color var(--dur) var(--ease);
  text-align: center;
}

.mode-toggle__btn--active {
  color: var(--clr-text-primary);
}

.mode-toggle__slider {
  position: absolute;
  top: 4px;
  left: 4px;
  height: calc(100% - 8px);
  width: calc(50% - 4px);
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.22), rgba(139, 92, 246, 0.15));
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: calc(var(--radius-md) - 4px);
  pointer-events: none;
  transition: transform var(--dur) var(--ease);
  z-index: 1;
}

/* Moving slide right in LTR */
.mode-toggle__slider--right {
  transform: translateX(100%);
}

/* Moving slide left in RTL */
html[dir="rtl"] .mode-toggle__slider {
  left: auto;
  right: 4px;
}
html[dir="rtl"] .mode-toggle__slider--right {
  transform: translateX(-100%);
}

/* ── Input Fields ────────────────────────────────────────── */
.auth-form {
  display: flex;
  flex-direction: column;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
  margin-bottom: 1.5rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.field__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--clr-text-secondary);
  transition: color var(--dur) var(--ease);
}

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

.field__icon {
  position: absolute;
  left: 0.875rem;
  width: 16px;
  height: 16px;
  color: var(--clr-text-muted);
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color var(--dur) var(--ease);
}

.field__icon svg {
  width: 100%;
  height: 100%;
  display: block;
}

.field__input-wrap:focus-within .field__icon {
  color: var(--clr-accent-light);
}

.field__input {
  width: 100%;
  padding: 0.75rem 1rem 0.75rem 2.5rem;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  color: var(--clr-text-primary);
  background: rgba(0, 0, 0, 0.15);
  border: 1.5px solid var(--clr-border);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.field__input::placeholder {
  color: var(--clr-text-muted);
}

.field__input:focus {
  border-color: var(--clr-accent);
  background: rgba(99, 102, 241, 0.04);
  box-shadow: 0 0 0 3px var(--clr-accent-glow);
}

.field__input--mono {
  font-family: 'Courier New', monospace;
  letter-spacing: 0.05em;
}

.field__toggle-pw {
  position: absolute;
  right: 0.75rem;
  background: transparent;
  border: none;
  padding: 0.25rem;
  cursor: pointer;
  color: var(--clr-text-muted);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.field__toggle-pw:hover {
  color: var(--clr-text-primary);
  background: rgba(255, 255, 255, 0.05);
}

.field__toggle-pw svg {
  width: 16px;
  height: 16px;
}

/* RTL Specific Overrides for inputs */
html[dir="rtl"] .field__label {
  text-align: right;
}

html[dir="rtl"] .field__icon {
  left: auto;
  right: 0.875rem;
}

html[dir="rtl"] .field__input {
  padding: 0.75rem 2.5rem 0.75rem 2.5rem;
  text-align: right;
}

html[dir="rtl"] .field__toggle-pw {
  right: auto;
  left: 0.75rem;
}

/* ── Error Messages Container ────────────────────────────── */
.error-container {
  display: flex;
  align-items: flex-start;
  gap: 0.65rem;
  padding: 0.75rem 1rem;
  background: var(--clr-error-bg);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: var(--radius-md);
  color: #f87171;
  font-size: 0.85rem;
  font-weight: 500;
  line-height: 1.45;
  animation: shake 0.4s var(--ease) forwards;
}

html[dir="rtl"] .error-container {
  text-align: right;
}

.error-icon {
  background: rgba(239, 68, 68, 0.15);
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: bold;
  flex-shrink: 0;
  margin-top: 1px;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%, 60% { transform: translateX(-6px); }
  40%, 80% { transform: translateX(6px); }
}

/* ── Buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  font-family: var(--font-sans);
  border-radius: var(--radius-md);
  border: 1.5px solid transparent;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease), box-shadow var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn--primary {
  background: linear-gradient(135deg, var(--clr-accent) 0%, var(--clr-violet) 100%);
  color: #fff;
  box-shadow: 0 4px 18px rgba(99, 102, 241, 0.3);
}

.btn--primary:hover {
  box-shadow: 0 6px 24px rgba(99, 102, 241, 0.45);
  transform: translateY(-1px);
}

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

.btn--full {
  width: 100%;
}

.btn__text {
  position: relative;
  z-index: 1;
}

.btn__spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.25);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  position: relative;
  z-index: 1;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ── Footer ──────────────────────────────────────────────── */
.auth-footer {
  text-align: center;
  font-size: 0.75rem;
  color: var(--clr-text-muted);
  letter-spacing: 0.02em;
  margin-top: 0.5rem;
}

.auth-footer strong {
  font-weight: 700;
  color: var(--clr-text-secondary);
}

/* Responsive adjustments */
@media (max-width: 480px) {
  #app-root {
    padding: 1rem 0.5rem;
  }
  .auth-form-panel {
    padding: 1.75rem 1.25rem;
    border-radius: var(--radius-lg);
  }
  .login-lang-container {
    top: 1rem;
    right: 1rem;
  }
  html[dir="rtl"] .login-lang-container {
    left: 1rem;
  }
}