:root {
  --font-sans: "Inter", "Helvetica Neue", Helvetica, Arial, sans-serif;

  --fw-regular: 400;
  --fw-semibold: 600;
  --fw-bold: 700;

  --fs-xs: 0.75rem;
  --fs-sm: 0.875rem;
  --fs-md: 1rem;
  --fs-lg: 1.25rem;
  --fs-title: 1.125rem;

  --lh-tight: 1.3;
  --lh-normal: 1.5;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 40px;

  --radius-input: 8px;
  --radius-card: 16px;
  --radius-pill: 999px;

  --control-height: 44px;
  --header-height: 50px;
  --header-height-desktop: 72px;
  --card-width: 500px;
  --logo-height: 30px;
  --logo-height-desktop: 48px;

  --icon-size: 24px;
  --tap-size: 40px;
  --focus-width: 2px;
  --focus-offset: 2px;
  --label-float-scale: 0.82;

  --motion: 0.15s ease;
  --motion-press: 0.05s ease;

  --z-header: 100;

  --shadow-card: 0 10px 30px rgba(12, 12, 11, 0.08), 0 2px 6px rgba(12, 12, 11, 0.05);
  --focus-ring: 0 0 0 3px rgba(50, 105, 22, 0.35);

  --color-lime: #b5e941;
  --color-lime-strong: #a6dd2f;
  --color-green: #326916;
  --color-green-dark: #1d4b00;
  --color-ink: #0c0c0b;
  --color-text: #0c0c0b;
  --color-muted: #77756f;
  --color-muted-2: #95958e;
  --color-page: #ffffff;
  --color-surface: #ffffff;
  --color-surface-2: #f4f2ef;
  --color-border: #dddbd5;
  --color-input-border: #95958e;
  --color-input-border-focus: #0c0c0b;
  --color-error: #b30c0c;

  --color-link: var(--color-green);
  --color-btn-bg: var(--color-lime);
  --color-btn-bg-hover: var(--color-lime-strong);
  --color-btn-text: var(--color-green-dark);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-page: #121212;
    --color-surface: #1e1e1e;
    --color-surface-2: #2c2c2c;
    --color-ink: #ffffff;
    --color-text: #ffffff;
    --color-muted: #a1a1aa;
    --color-muted-2: #a1a1aa;
    --color-border: #555555;
    --color-input-border: #555555;
    --color-input-border-focus: #ffffff;
    --color-error: #ff5a5f;
    --color-link: var(--color-lime);
    --color-btn-text: var(--color-green-dark);
    --focus-ring: 0 0 0 3px rgba(181, 233, 65, 0.4);
  }
}

:root[data-theme="dark"] {
  --color-page: #121212;
  --color-surface: #1e1e1e;
  --color-surface-2: #2c2c2c;
  --color-ink: #ffffff;
  --color-text: #ffffff;
  --color-muted: #a1a1aa;
  --color-muted-2: #a1a1aa;
  --color-border: #555555;
  --color-input-border: #555555;
  --color-input-border-focus: #ffffff;
  --color-error: #ff5a5f;
  --color-link: var(--color-lime);
  --color-btn-text: var(--color-green-dark);
  --focus-ring: 0 0 0 3px rgba(181, 233, 65, 0.4);
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  font-weight: var(--fw-regular);
  line-height: var(--lh-normal);
  color: var(--color-text);
  background: var(--color-page);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
}

a {
  color: var(--color-link);
}

.knz-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  display: flex;
  align-items: center;
  justify-content: center;
  height: var(--header-height);
  padding: 0 var(--space-3);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.knz-header__back {
  position: absolute;
  left: var(--space-1);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--tap-size);
  height: var(--tap-size);
  border-radius: var(--radius-input);
  color: var(--color-link);
}

.knz-header__back svg {
  width: var(--icon-size);
  height: var(--icon-size);
  display: block;
}

.knz-header__logo-link {
  display: none;
  align-items: center;
  line-height: 0;
  border-radius: var(--radius-input);
}

.knz-header__logo-img {
  height: var(--logo-height-desktop);
  width: auto;
  display: block;
}

.knz-header__help-link {
  position: absolute;
  right: var(--space-2);
  top: 50%;
  transform: translateY(-50%);
  padding: var(--space-1) var(--space-1);
  border-radius: var(--radius-input);
  font-size: var(--fs-sm);
  color: var(--color-link);
  text-decoration: none;
}

.knz-header__help-link:hover {
  text-decoration: underline;
}

.page {
  display: flex;
  justify-content: center;
  padding: var(--space-7) var(--space-4) var(--space-7);
}

.prompt-card {
  width: 100%;
  max-width: var(--card-width);
  background: var(--color-surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: var(--space-5);
  text-align: center;
}

.prompt-card__logo {
  display: block;
  height: var(--logo-height);
  width: auto;
  margin: 0 auto var(--space-5);
}

.prompt-card__title {
  margin: 0 0 var(--space-3);
  font-size: var(--fs-title);
  font-weight: var(--fw-bold);
  line-height: var(--lh-tight);
  letter-spacing: -0.01em;
  color: var(--color-ink);
}

.prompt-card__subtitle {
  margin: 0 auto var(--space-5);
  font-size: var(--fs-sm);
  font-weight: var(--fw-regular);
  line-height: var(--lh-normal);
  color: var(--color-text);
}

.login-form {
  margin: 0;
  text-align: left;
}

.field {
  position: relative;
  margin-bottom: var(--space-5);
}

.field__input {
  width: 100%;
  height: var(--control-height);
  padding: 0 var(--space-4);
  font-family: inherit;
  font-size: var(--fs-sm);
  color: var(--color-text);
  background: transparent;
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-input);
  outline: none;
  transition: border-color var(--motion), box-shadow var(--motion);
}

.field__input:hover {
  border-color: var(--color-input-border-focus);
}

.field__input:focus {
  border-color: var(--color-input-border-focus);
  box-shadow: inset 0 0 0 1px var(--color-input-border-focus);
}

.field__label {
  position: absolute;
  left: var(--space-3);
  top: 50%;
  transform: translateY(-50%);
  transform-origin: left center;
  padding: 0 var(--space-1);
  max-width: calc(100% - var(--space-5));
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-size: var(--fs-sm);
  color: var(--color-muted);
  background: var(--color-surface);
  pointer-events: none;
  transition: top var(--motion), transform var(--motion), color var(--motion);
}

.field__input:focus + .field__label,
.field__input:not(:placeholder-shown) + .field__label {
  top: 0;
  transform: translateY(-50%) scale(var(--label-float-scale));
  color: var(--color-input-border-focus);
}

.field__input[aria-invalid="true"] {
  border-color: var(--color-error);
}

.field__input[aria-invalid="true"]:focus {
  box-shadow: inset 0 0 0 1px var(--color-error);
}

.field__input[aria-invalid="true"] + .field__label {
  color: var(--color-error);
}

.field__required {
  color: inherit;
}

.field__error {
  display: block;
  margin-top: var(--space-1);
  padding-left: var(--space-1);
  font-size: var(--fs-xs);
  line-height: 1.4;
  color: var(--color-error);
}

.field__error[hidden] {
  display: none;
}

[hidden] {
  display: none !important;
}

.field__input--with-action {
  padding-right: calc(var(--space-4) + 28px);
}

.field__reveal {
  position: absolute;
  top: 50%;
  right: var(--space-3);
  transform: translateY(-50%);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  color: var(--color-muted);
  background: transparent;
  border: none;
  border-radius: var(--radius-input);
  cursor: pointer;
  transition: color var(--motion);
}

.field__reveal svg {
  width: 20px;
  height: 20px;
}

.field__reveal:hover,
.field__reveal--active {
  color: var(--color-text);
}

.field--locked {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  height: var(--control-height);
  padding: 0 var(--space-4);
  border: 1px solid var(--color-input-border);
  border-radius: var(--radius-input);
}

.field__value {
  font-size: var(--fs-sm);
  color: var(--color-text);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.field__edit {
  flex-shrink: 0;
  padding: 0;
  font-family: inherit;
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  background: transparent;
  border: none;
  cursor: pointer;
}

.forgot-link {
  display: inline-block;
  margin: 0 0 var(--space-5);
  font-weight: var(--fw-bold);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: var(--control-height);
  padding: 0 var(--space-4);
  font-family: inherit;
  font-size: var(--fs-sm);
  font-weight: var(--fw-semibold);
  line-height: 1;
  border: none;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: background-color var(--motion), transform var(--motion-press);
}

.btn--primary {
  background: var(--color-btn-bg);
  color: var(--color-btn-text);
}

.btn--primary:hover {
  background: var(--color-btn-bg-hover);
}

.btn--primary:active {
  transform: scale(0.995);
}

.prompt-card__footer {
  margin: var(--space-6) 0 0;
  font-size: var(--fs-sm);
  color: var(--color-text);
}

.link {
  color: var(--color-link);
  font-weight: var(--fw-bold);
  text-decoration: underline;
  text-underline-offset: var(--focus-offset);
  border-radius: var(--focus-offset);
}

.link:hover {
  text-decoration-thickness: 2px;
}

:focus-visible {
  outline: var(--focus-width) solid var(--color-link);
  outline-offset: var(--focus-offset);
}

.btn:focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.field__input:focus-visible {
  outline: none;
  border-color: var(--color-input-border-focus);
  box-shadow: inset 0 0 0 1px var(--color-input-border-focus);
}

@media (min-width: 601px) {
  .knz-header {
    height: var(--header-height-desktop);
  }

  .knz-header__logo-link {
    display: inline-flex;
  }

  .prompt-card__logo {
    display: none;
  }

  .page {
    padding-top: calc(var(--space-7) * 2);
  }

  .prompt-card {
    padding: var(--space-7);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}

.form-banner {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
  padding: var(--space-3);
  border-radius: var(--radius-input);
  font-size: var(--fs-sm);
  line-height: var(--lh-normal);
  text-align: left;
  color: var(--color-error);
  background: color-mix(in srgb, var(--color-error) 10%, var(--color-surface));
  border: 1px solid color-mix(in srgb, var(--color-error) 35%, transparent);
}

.form-banner svg {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  margin-top: 1px;
}

.form-banner--warn {
  color: var(--color-green-dark);
  background: color-mix(in srgb, var(--color-lime) 22%, var(--color-surface));
  border-color: color-mix(in srgb, var(--color-lime-strong) 55%, transparent);
}

.btn[data-state="loading"] {
  position: relative;
  color: transparent;
  cursor: default;
}

.btn[data-state="loading"] .btn__label {
  visibility: hidden;
}

.btn__spinner {
  display: none;
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border: 2px solid color-mix(in srgb, var(--color-btn-text) 35%, transparent);
  border-top-color: var(--color-btn-text);
  border-radius: var(--radius-pill);
  animation: klz-spin 0.6s linear infinite;
}

.btn[data-state="loading"] .btn__spinner {
  display: block;
}

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

.field__input:disabled,
.field__input[aria-disabled="true"] {
  opacity: 0.6;
  cursor: not-allowed;
}

.success-card__badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  margin: 0 auto var(--space-5);
  background: var(--color-surface-2);
  border-radius: var(--radius-pill);
  animation: klz-badge-in 0.4s var(--motion) both;
}

.success-card__badge svg {
  width: 32px;
  height: 32px;
  color: var(--color-green);
}

@keyframes klz-badge-in {
  from {
    transform: scale(0.96);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

.warm-hint {
  margin: var(--space-3) 0 0;
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-muted);
}

@media (prefers-reduced-motion: reduce) {
  .btn__spinner {
    animation: none;
  }
  .success-card__badge {
    animation: none;
  }
}