/**
 * Trang đăng nhập — palette trung tính, token màu dễ bảo trì.
 * (Không dùng nesting SCSS; file này là CSS thuần.)
 */
:root {
  --login-bg-0: #f8fafc;
  --login-bg-1: #eef2f7;
  --login-card: #ffffff;
  --login-border: #e5e7eb;
  --login-border-strong: #d1d5db;
  --login-text: #111827;
  --login-text-muted: #6b7280;
  --login-text-placeholder: #9ca3af;
  --login-input-bg: #f9fafb;
  --login-icon-bg: #f3f4f6;
  --login-icon-fg: #4b5563;
  --login-btn: #111827;
  --login-btn-hover: #1f2937;
  --login-btn-text: #f9fafb;
  --login-link: #4b5563;
  --login-link-hover: #111827;
  --login-focus-ring: rgba(17, 24, 39, 0.18);
  --login-shadow: 0 1px 3px rgba(15, 23, 42, 0.06), 0 12px 40px -12px rgba(15, 23, 42, 0.12);
  --login-radius-card: 16px;
  --login-radius-control: 10px;
  --login-font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.login-page {
  margin: 0;
  min-height: 100vh;
  font-family: var(--login-font);
  font-size: 15px;
  line-height: 1.5;
  color: var(--login-text);
  background: var(--login-bg-0);
  -webkit-font-smoothing: antialiased;
}

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

.login-shell {
  min-height: 100vh;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px 16px;
  background: linear-gradient(165deg, var(--login-bg-0) 0%, var(--login-bg-1) 55%, #e8ecf2 100%);
}

.login-container {
  width: 100%;
  max-width: 960px;
}

.login-card {
  display: flex;
  flex-direction: column;
  background: var(--login-card);
  border: 1px solid var(--login-border);
  border-radius: var(--login-radius-card);
  box-shadow: var(--login-shadow);
  overflow: hidden;
}

@media (min-width: 768px) {
  .login-card {
    flex-direction: row;
    align-items: stretch;
    min-height: 420px;
  }
}

.login-card__brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 28px;
  text-align: center;
  background: linear-gradient(180deg, #fafbfc 0%, #f4f6f8 100%);
  border-bottom: 1px solid var(--login-border);
}

@media (min-width: 768px) {
  .login-card__brand {
    flex: 0 0 42%;
    max-width: 42%;
    border-bottom: none;
    border-right: 1px solid var(--login-border);
    padding: 40px 32px;
  }
}

.login-card__brand img {
  max-width: min(260px, 100%);
  max-height: 96px;
  width: auto;
  height: auto;
  object-fit: contain;
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.login-card__body {
  flex: 1;
  padding: 28px 24px 32px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

@media (min-width: 768px) {
  .login-card__body {
    padding: 40px 40px 44px;
  }
}

.login-card__title {
  margin: 0 0 6px;
  font-size: 1.375rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--login-text);
}

.login-card__subtitle {
  margin: 0 0 24px;
  font-size: 0.875rem;
  color: var(--login-text-muted);
}

.login-form fieldset {
  margin: 0;
  padding: 0;
  border: 0;
}

.login-field {
  margin: 0 0 14px;
}

.login-input-wrap {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--login-border);
  border-radius: var(--login-radius-control);
  background: var(--login-input-bg);
  overflow: hidden;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.login-input-wrap:focus-within {
  border-color: var(--login-border-strong);
  background: #fff;
  box-shadow: 0 0 0 3px var(--login-focus-ring);
}

.login-input-wrap .login-input-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  flex-shrink: 0;
  background: var(--login-icon-bg);
  color: var(--login-icon-fg);
  font-size: 1rem;
  border-right: 1px solid var(--login-border);
}

.login-input-wrap input[type="text"],
.login-input-wrap input[type="password"] {
  flex: 1;
  min-width: 0;
  height: 48px;
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 0.9375rem;
  color: var(--login-text);
  padding: 0 14px;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
}

.login-input-wrap input::placeholder {
  color: var(--login-text-placeholder);
}

.login-row-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 16px;
  margin: 6px 0 20px;
}

.login-remember {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  font-size: 0.8125rem;
  color: var(--login-text-muted);
  cursor: pointer;
  user-select: none;
}

.login-remember input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--login-btn);
  cursor: pointer;
}

.login-actions {
  display: flex;
  flex-direction: column-reverse;
  gap: 12px;
  align-items: stretch;
}

@media (min-width: 480px) {
  .login-actions {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.login-forgot {
  font-size: 0.8125rem;
  color: var(--login-link);
  text-decoration: none;
  transition: color 0.15s ease;
}

.login-forgot:hover,
.login-forgot:focus {
  color: var(--login-link-hover);
  text-decoration: underline;
}

.login-forgot:focus-visible {
  outline: 2px solid var(--login-focus-ring);
  outline-offset: 2px;
  border-radius: 4px;
}

.login-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: none;
  border-radius: var(--login-radius-control);
  background: var(--login-btn);
  color: var(--login-btn-text);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}

.login-submit:hover {
  background: var(--login-btn-hover);
}

.login-submit:active {
  transform: translateY(1px);
}

.login-submit:focus-visible {
  outline: 2px solid var(--login-btn);
  outline-offset: 2px;
}

/* Alerts trong card (Bootstrap) */
.login-card .alert {
  text-align: left;
  border-radius: 10px;
  font-size: 0.875rem;
  margin-bottom: 16px;
}

.login-card .alert ul {
  margin: 0;
  padding-left: 1.1em;
}

/* Chỉ hiện trên mobile (<768px) */
.hidden-desktop {
  display: block;
}

@media (min-width: 768px) {
  .hidden-desktop {
    display: none !important;
  }
}

/* Chỉ hiện từ tablet trở lên */
.hidden-mobile {
  display: none;
}

@media (min-width: 768px) {
  .hidden-mobile {
    display: block;
  }
}