:root {
  --k-primary: #2563EB;
  --k-primary-dark: #1E40AF;
  --k-primary-soft: #DBEAFE;
  --k-accent: #0EA5E9;
  --k-accent-soft: #E0F2FE;
  --k-bg: #F8FAFC;
  --k-surface: #FFFFFF;
  --k-text: #0F172A;
  --k-text-muted: #64748B;
  --k-border: #E2E8F0;
  --k-success: #16A34A;
  --k-warning: #D97706;
  --k-danger: #DC2626;
  --k-info: #0284C7;
  --k-danger-soft: #FEE2E2;
  --radius: 12px;
  --shadow-card: 0 20px 45px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--k-text);
  background: var(--k-bg);
}

a {
  color: var(--k-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.login-wrap {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
  background:
    radial-gradient(1000px 500px at 80% -10%, var(--k-accent-soft), transparent 60%),
    radial-gradient(800px 400px at -10% 110%, var(--k-primary-soft), transparent 60%),
    var(--k-bg);
}

.login-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  width: min(920px, 100%);
  min-height: 520px;
  background: var(--k-surface);
  border: 1px solid var(--k-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.login-brand {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 48px 40px;
  color: #fff;
  background: linear-gradient(135deg, var(--k-primary), var(--k-primary-dark));
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-weight: 700;
  font-size: 18px;
  text-decoration: none;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: #fff;
  color: var(--k-primary);
  font-weight: 800;
  font-size: 20px;
}

.brand-title {
  margin: 24px 0 0;
  font-size: 30px;
  line-height: 1.2;
}

.brand-sub {
  margin: 0;
  color: var(--k-accent-soft);
}

.brand-points {
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.brand-points li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

.brand-points li::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--k-accent);
}

.login-form-wrap {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 20px;
  padding: 48px 40px;
}

.form-head {
  margin-bottom: 8px;
}

.form-title {
  margin: 0;
  font-size: 24px;
}

.form-sub {
  margin: 4px 0 0;
  color: var(--k-text-muted);
  font-size: 14px;
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  margin-bottom: 6px;
  font-size: 14px;
  font-weight: 600;
}

.field input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--k-border);
  border-radius: 8px;
  font: inherit;
  color: var(--k-text);
  background: var(--k-surface);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.field input:focus {
  outline: none;
  border-color: var(--k-primary);
  box-shadow: 0 0 0 3px var(--k-primary-soft);
}

.field input[aria-invalid="true"] {
  border-color: var(--k-danger);
}

.form-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 14px;
}

.check {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  color: var(--k-text-muted);
}

.check input {
  width: 16px;
  height: 16px;
  accent-color: var(--k-primary);
}

.link-muted {
  color: var(--k-primary);
}

.form-status {
  min-height: 20px;
  margin: 8px 0 0;
  padding: 8px 10px;
  border-radius: 8px;
  font-size: 14px;
  color: var(--k-danger);
  background: var(--k-danger-soft);
  display: none;
}

.form-status.is-visible {
  display: block;
}

.form-status.is-error {
  color: var(--k-danger);
  background: var(--k-danger-soft);
}

.form-status.is-info {
  color: var(--k-info);
  background: var(--k-accent-soft);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 13px 16px;
  border: none;
  border-radius: 8px;
  font: inherit;
  font-weight: 700;
  color: #fff;
  background: var(--k-primary);
  cursor: pointer;
  transition: background-color 0.15s, transform 0.05s;
}

.btn-primary:hover {
  background: var(--k-primary-dark);
}

.btn-primary:active {
  transform: translateY(1px);
}

.btn-primary:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--k-primary-soft);
}

.btn-primary:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.5);
  border-top-color: #fff;
  border-radius: 50%;
  animation: k-spin 0.7s linear infinite;
}

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

.form-foot {
  margin: 0;
  font-size: 14px;
  color: var(--k-text-muted);
}

.form-foot--muted {
  color: var(--k-text-muted);
  font-size: 13px;
}

@media (max-width: 720px) {
  .login-card {
    grid-template-columns: 1fr;
  }

  .login-brand {
    padding: 32px 28px;
  }

  .brand-title {
    margin-top: 8px;
    font-size: 24px;
  }

  .brand-points {
    display: none;
  }

  .login-form-wrap {
    padding: 32px 28px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .spinner {
    animation-duration: 1.4s;
  }
}