:root {
  --page-bg: #0e1422;
  --panel-bg: #141d2f;
  --field-bg: #0f1728;
  --primary: #4f8cff;
  --primary-dark: #2f6fe8;
  --text: #eef4ff;
  --muted: #a8b4c9;
  --line: #2b3952;
  --shadow: rgba(0, 0, 0, 0.38);
}

body[data-theme="light"] {
  --page-bg: #f3f6fb;
  --panel-bg: #ffffff;
  --field-bg: #f8fafc;
  --primary: #2457d6;
  --primary-dark: #1b43a7;
  --text: #172033;
  --muted: #6d788b;
  --line: #d9e0ea;
  --shadow: rgba(23, 32, 51, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    linear-gradient(135deg, rgba(79, 140, 255, 0.18), rgba(20, 154, 139, 0.16)),
    var(--page-bg);
  font-family: Arial, Helvetica, sans-serif;
  transition: background-color 180ms ease, color 180ms ease;
}

.login-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.login-panel {
  width: min(100%, 430px);
  background: var(--panel-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 24px 70px var(--shadow);
  padding: 32px;
  position: relative;
}

.theme-actions {
  display: flex;
  justify-content: flex-end;
  margin-bottom: 18px;
}

.theme-toggle {
  width: 42px;
  height: 42px;
  display: inline-grid;
  place-items: center;
  color: var(--text);
  background: var(--field-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.theme-toggle:hover,
.theme-toggle:focus {
  color: #ffffff;
  background: var(--primary);
  border-color: var(--primary);
}

.brand-area {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
}

.brand-mark {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary), #149a8b);
  font-size: 24px;
}

.brand-kicker {
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 700;
  text-transform: uppercase;
}

.brand-title {
  font-size: 2rem;
  font-weight: 800;
}

.login-card .form-label {
  color: var(--text);
  font-weight: 700;
}

.input-group-text {
  min-width: 46px;
  justify-content: center;
  color: var(--muted);
  background: var(--field-bg);
  border-color: var(--line);
}

.form-control {
  color: var(--text);
  background: var(--field-bg);
  border-color: var(--line);
  min-height: 46px;
}

.form-control::placeholder {
  color: var(--muted);
}

.form-control:focus {
  color: var(--text);
  background: var(--field-bg);
  border-color: var(--primary);
  box-shadow: 0 0 0 0.2rem rgba(36, 87, 214, 0.16);
}

.form-check-input:checked {
  background-color: var(--primary);
  border-color: var(--primary);
}

.form-check-label {
  color: var(--muted);
}

.login-link {
  color: var(--primary);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
}

.login-link:hover {
  color: var(--primary-dark);
  text-decoration: underline;
}

.btn-primary {
  min-height: 48px;
  background: var(--primary);
  border-color: var(--primary);
  font-weight: 800;
}

.btn-primary:hover,
.btn-primary:focus {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
}

.app-modal {
  color: var(--text);
  background: var(--panel-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 24px 70px var(--shadow);
}

.app-modal .modal-header,
.app-modal .modal-footer {
  border-color: var(--line);
}

.modal-heading {
  display: flex;
  align-items: center;
  gap: 12px;
}

.modal-icon {
  width: 38px;
  height: 38px;
  display: inline-grid;
  place-items: center;
  color: #ffffff;
  background: var(--primary);
  border-radius: 8px;
}

.modal-icon.success {
  background: #168a5b;
}

.modal-icon.warning {
  background: #b57914;
}

.modal-icon.error {
  background: #c33d3d;
}

.modal-body {
  color: var(--muted);
}

.app-modal-close {
  filter: invert(1) grayscale(100%) brightness(180%);
}

body[data-theme="light"] .app-modal-close {
  filter: none;
}

@media (max-width: 420px) {
  .login-panel {
    padding: 24px;
  }

  .brand-title {
    font-size: 1.7rem;
  }
}