:root {
  --c-brand: #4860F4;
  --c-active: #362FB7;
  --c-heading: #15181F;
  --c-text: #484E5E;
  --c-border: #A7B6FA;
  --c-error: #D4450C;
  --c-bg: #FAFBFC;
  --c-surface: #FFFFFF;
  --c-disabled: #95A3CC;
  --r-sm: 8px;
  --r-lg: 24px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --dur-s: 120ms;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  font-family: var(--font);
  color: var(--c-heading);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
}

:focus-visible {
  outline: 2px solid var(--c-active);
  outline-offset: 2px;
  border-radius: var(--r-sm);
}

.layout {
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(420px, 676px) 1fr;
}

.panel {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.panel-content {
  width: 100%;
  max-width: 358px;
}

.logo {
  display: block;
  width: 131px;
  height: auto;
  margin-bottom: 40px;
}

h1 {
  font-size: 24px;
  line-height: 30px;
  font-weight: 600;
  color: var(--c-heading);
  margin: 0 0 8px;
}

.subtitle {
  font-size: 14px;
  line-height: 20px;
  color: var(--c-text);
  margin: 0 0 32px;
}

label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-heading);
  margin-bottom: 8px;
}

input[type="password"] {
  display: block;
  width: 100%;
  height: 48px;
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  padding: 0 16px;
  font: 400 14px/20px var(--font);
  color: var(--c-heading);
  background: var(--c-surface);
  transition: border-color var(--dur-s), box-shadow var(--dur-s);
}

input[type="password"]:hover { border-color: var(--c-active); }

input[type="password"]:focus-visible {
  outline: 0;
  border-color: var(--c-active);
  box-shadow: 0 0 0 2px rgba(54, 47, 183, .18);
}

input[type="password"].invalid { border-color: var(--c-error); }

.error {
  margin: 8px 0 0;
  font-size: 12px;
  line-height: 18px;
  color: var(--c-error);
}

.error[hidden] { display: none; }

button {
  display: block;
  width: 196px;
  height: 48px;
  margin: 24px auto 0;
  background: var(--c-brand);
  color: #FFFFFF;
  border: none;
  border-radius: var(--r-sm);
  font: 600 16px/22px var(--font);
  cursor: pointer;
  transition: background-color var(--dur-s);
}

button:hover { background: var(--c-active); }

button:disabled {
  background: var(--c-disabled);
  cursor: default;
}

.hero {
  border-radius: var(--r-lg);
  margin: 24px 24px 24px 0;
  background: linear-gradient(180deg, #4860F4 0%, #362FB7 100%);
}

/* Wąskie okno: panel formularza na całą szerokość, hero znika (zamiast ściskać layout poniżej 420px). */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .hero { display: none; }
  .panel { padding: 32px 24px; }
}