/**
 * Login page styles
 * BEM naming, mobile-first, WCAG AA compliant
 * Breakpoints: 320px (base), 768px (tablet), 1200px+ (desktop)
 */

/* ========== CSS custom properties (theming) ========== */
:root {
  --login-font-sans: "DM Sans", system-ui, -apple-system, sans-serif;
  --login-font-mono: "JetBrains Mono", ui-monospace, monospace;

  --login-color-bg: #0f1419;
  --login-color-bg-card: rgba(22, 28, 36, 0.92);
  --login-color-bg-input: rgba(255, 255, 255, 0.06);
  --login-color-surface: rgba(255, 255, 255, 0.04);

  --login-color-text: #e6edf3;
  --login-color-text-muted: #8b949e;
  --login-color-text-inverse: #0f1419;

  --login-color-primary: #3fb950;
  --login-color-primary-hover: #56d364;
  --login-color-primary-active: #2ea043;
  --login-color-focus: #58a6ff;
  --login-color-error: #f85149;
  --login-color-error-bg: rgba(248, 81, 73, 0.12);

  --login-radius-sm: 6px;
  --login-radius-md: 10px;
  --login-radius-lg: 16px;
  --login-shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4), 0 0 0 1px rgba(255, 255, 255, 0.06);
  --login-shadow-focus: 0 0 0 3px rgba(88, 166, 255, 0.35);

  --login-transition-duration: 0.2s;
  --login-transition-timing: ease;
}

/* ========== Base & layout ========== */
.login-page {
  font-family: var(--login-font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--login-color-text);
  background-color: var(--login-color-bg);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  box-sizing: border-box;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.login-page__bg {
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(63, 185, 80, 0.12) 0%, transparent 55%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(88, 166, 255, 0.06) 0%, transparent 50%),
    var(--login-color-bg);
  z-index: -1;
  pointer-events: none;
}

.login-page__main {
  width: 100%;
  max-width: 24rem;
  animation: login-page-fade-in 0.5s var(--login-transition-timing) both;
}

@keyframes login-page-fade-in {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .login-page__main {
    animation: none;
  }
}

/* ========== Card ========== */
.login-card {
  background: var(--login-color-bg-card);
  border-radius: var(--login-radius-lg);
  box-shadow: var(--login-shadow-card);
  padding: 2rem 1.5rem;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

@media (min-width: 768px) {
  .login-card {
    padding: 2.5rem 2rem;
  }
}

/* ========== Card header & logo ========== */
.login-card__header {
  text-align: center;
  margin-bottom: 1.75rem;
}

.login-card__logo {
  margin-bottom: 1.25rem;
}

.login-card__logo-img {
  width: 44%;
  min-width: 120px;
  max-width: 160px;
  height: auto;
  display: block;
  margin-inline: auto;
  border-radius: var(--login-radius-sm);
}

.login-card__title {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 0.25rem;
  color: var(--login-color-text);
}

.login-card__subtitle {
  font-size: 0.9375rem;
  color: var(--login-color-text-muted);
  margin: 0;
}

/* ========== Alerts ========== */
.login-card__alerts {
  margin-bottom: 1.25rem;
}

.login-alert {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--login-radius-md);
  font-size: 0.875rem;
  animation: login-alert-in 0.3s var(--login-transition-timing) both;
}

.login-alert + .login-alert {
  margin-top: 0.5rem;
}

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

.login-alert--error {
  background: var(--login-color-error-bg);
  color: var(--login-color-error);
  border: 1px solid rgba(248, 81, 73, 0.25);
}

.login-alert__message {
  flex: 1;
  min-width: 0;
}

.login-alert__dismiss {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  min-width: 44px;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: var(--login-radius-sm);
  color: inherit;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  transition: background-color var(--login-transition-duration) var(--login-transition-timing);
}

.login-alert__dismiss:hover,
.login-alert__dismiss:focus-visible {
  background: rgba(248, 81, 73, 0.2);
}

.login-alert__dismiss:focus {
  outline: none;
}

.login-alert__dismiss:focus-visible {
  outline: 2px solid currentColor;
  outline-offset: 2px;
}

/* ========== Form ========== */
.login-form__group {
  margin-bottom: 1.25rem;
}

.login-form__label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--login-color-text);
  margin-bottom: 0.375rem;
}

.login-form__required {
  color: var(--login-color-error);
}

.login-form__input {
  display: block;
  width: 100%;
  padding: 0.75rem 1rem;
  font-family: var(--login-font-sans);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--login-color-text);
  background: var(--login-color-bg-input);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--login-radius-md);
  box-sizing: border-box;
  transition:
    border-color var(--login-transition-duration) var(--login-transition-timing),
    box-shadow var(--login-transition-duration) var(--login-transition-timing),
    background-color var(--login-transition-duration) var(--login-transition-timing);
}

.login-form__input::placeholder {
  color: var(--login-color-text-muted);
}

.login-form__input:hover {
  border-color: rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.08);
}

.login-form__input:focus {
  outline: none;
  border-color: var(--login-color-focus);
  box-shadow: var(--login-shadow-focus);
  background: rgba(255, 255, 255, 0.08);
}

.login-form__input:focus-visible {
  outline: none;
  border-color: var(--login-color-focus);
  box-shadow: var(--login-shadow-focus);
}

/* Invalid state (client-side validation) */
.login-form__input[aria-invalid="true"],
.login-form__input:invalid:not(:placeholder-shown) {
  border-color: var(--login-color-error);
  background: var(--login-color-error-bg);
}

.login-form__hint {
  display: block;
  font-size: 0.8125rem;
  color: var(--login-color-text-muted);
  margin-top: 0.25rem;
}

.login-form__hint[data-error] {
  color: var(--login-color-error);
}

/* ========== Submit button ========== */
.login-form__actions {
  margin-top: 1.5rem;
}

.login-form__submit {
  width: 100%;
  min-height: 48px;
  padding: 0.875rem 1.5rem;
  font-family: var(--login-font-sans);
  font-size: 1rem;
  font-weight: 600;
  color: var(--login-color-text-inverse);
  background: var(--login-color-primary);
  border: none;
  border-radius: var(--login-radius-md);
  cursor: pointer;
  transition:
    background-color var(--login-transition-duration) var(--login-transition-timing),
    transform 0.15s var(--login-transition-timing);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.login-form__submit:hover {
  background: var(--login-color-primary-hover);
}

.login-form__submit:active {
  background: var(--login-color-primary-active);
  transform: scale(0.99);
}

.login-form__submit:focus {
  outline: none;
}

.login-form__submit:focus-visible {
  outline: 2px solid var(--login-color-primary);
  outline-offset: 3px;
}

.login-form__submit[aria-busy="true"] {
  pointer-events: none;
  cursor: wait;
}

.login-form__submit[aria-busy="true"] .login-form__submit-text {
  visibility: hidden;
  position: absolute;
}

.login-form__submit[aria-busy="true"] .login-form__submit-loader {
  display: inline-flex !important;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.login-form__submit-loader {
  display: none;
  position: absolute;
}

.login-form__spinner {
  width: 1.25rem;
  height: 1.25rem;
  border: 2px solid rgba(15, 20, 25, 0.25);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: login-spin 0.7s linear infinite;
}

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

@media (prefers-reduced-motion: reduce) {
  .login-form__spinner {
    animation: none;
    border-top-color: currentColor;
  }
}

/* ========== Responsive: tablet and up ========== */
@media (min-width: 768px) {
  .login-page {
    padding: 2rem;
  }

  .login-page__main {
    max-width: 28rem;
  }

  .login-card__title {
    font-size: 1.625rem;
  }
}

/* ========== Responsive: desktop ========== */
@media (min-width: 1200px) {
  .login-page__main {
    max-width: 26rem;
  }

  .login-card {
    padding: 3rem 2.5rem;
  }
}

/* ========== Skip link (accessibility) ========== */
.login-page .skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  padding: 0.75rem 1rem;
  background: var(--login-color-primary);
  color: var(--login-color-text-inverse);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--login-radius-sm);
  z-index: 100;
  transition: top 0.2s var(--login-transition-timing);
}

.login-page .skip-link:focus {
  top: 1rem;
  outline: 2px solid var(--login-color-text-inverse);
  outline-offset: 2px;
}