:root {
  --md-primary: #6750A4;
  --md-on-primary: #FFFFFF;
  --md-primary-container: #EADDFF;
  --md-on-primary-container: #21005D;
  --md-surface: #FEF7FF;
  --md-on-surface: #1C1B1F;
  --md-surface-variant: #E7E0EC;
  --md-on-surface-variant: #49454F;
  --md-outline: #79747E;
  --md-error: #B3261E;
  --md-shadow: rgba(0,0,0,0.15);
  --md-radius: 28px;
  --md-radius-small: 12px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --md-primary: #D0BCFF;
    --md-on-primary: #381E72;
    --md-primary-container: #4F378B;
    --md-on-primary-container: #EADDFF;
    --md-surface: #141218;
    --md-on-surface: #E6E1E5;
    --md-surface-variant: #49454F;
    --md-on-surface-variant: #CAC4D0;
    --md-outline: #938F99;
    --md-error: #F2B8B5;
    --md-shadow: rgba(0,0,0,0.4);
  }
}

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

body {
  font-family: 'Google Sans', sans-serif;
  background: var(--md-surface);
  color: var(--md-on-surface);
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-container {
  width: 100%;
  max-width: 400px;
  padding: 24px;
}

.login-card {
  background: var(--md-surface);
  border-radius: var(--md-radius);
  padding: 32px 24px;
  box-shadow: 0 4px 24px var(--md-shadow);
}

.login-header {
  text-align: center;
  margin-bottom: 32px;
}

.app-icon {
  font-size: 48px;
  margin-bottom: 12px;
}

.app-title {
  font-family: 'Google Sans Display', sans-serif;
  font-size: 32px;
  font-weight: 700;
  color: var(--md-primary);
  margin-bottom: 4px;
}

.app-subtitle {
  font-size: 14px;
  color: var(--md-on-surface-variant);
}

/* Steps */
.login-step {
  display: none;
  flex-direction: column;
  gap: 16px;
  animation: slideIn 0.3s ease;
}

.login-step.active {
  display: flex;
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(20px); }
  to { opacity: 1; transform: translateX(0); }
}

/* Text Field Material Style */
.text-field {
  position: relative;
}

.text-field input {
  width: 100%;
  padding: 16px;
  border: 2px solid var(--md-outline);
  border-radius: var(--md-radius-small);
  background: transparent;
  color: var(--md-on-surface);
  font-family: 'Google Sans', sans-serif;
  font-size: 16px;
  outline: none;
  transition: border-color 0.2s;
}

.text-field input:focus {
  border-color: var(--md-primary);
}

.text-field label {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--md-on-surface-variant);
  font-size: 16px;
  pointer-events: none;
  transition: all 0.2s;
  background: var(--md-surface);
  padding: 0 4px;
}

.text-field input:focus + label,
.text-field input:not(:placeholder-shown) + label {
  top: 0;
  font-size: 12px;
  color: var(--md-primary);
}

/* Button */
.btn-filled {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 16px;
  background: var(--md-primary);
  color: var(--md-on-primary);
  border: none;
  border-radius: 50px;
  font-family: 'Google Sans', sans-serif;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
}

.btn-filled:hover { opacity: 0.9; }
.btn-filled:active { transform: scale(0.98); }

/* User Chip */
.user-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--md-surface-variant);
  border-radius: 50px;
  font-size: 14px;
  color: var(--md-on-surface-variant);
}

.chip-back {
  margin-left: auto;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--md-on-surface-variant);
  display: flex;
  align-items: center;
}

/* TOTP */
.totp-icon {
  text-align: center;
  font-size: 48px;
  color: var(--md-primary);
}

.totp-hint {
  text-align: center;
  font-size: 14px;
  color: var(--md-on-surface-variant);
}

/* Error */
.error-msg {
  margin-top: 8px;
  padding: 12px 16px;
  background: #FFDAD6;
  color: var(--md-error);
  border-radius: var(--md-radius-small);
  font-size: 14px;
  text-align: center;
}

.hidden { display: none; }