/* =========================================
   LOGIN — Přihlašovací obrazovka
   =========================================
   Obsah:
   - Login screen (pozadí, card)
   - Logo
   - PIN inputy
   - Login tlačítko
   - Jazyk přepínač
   - Animace (fadeIn, shake)
   ========================================= */

/* =========================================
   PŘIHLAŠOVACÍ OBRAZOVKA
   ========================================= */
#login-screen {
  position: fixed;
  inset: 0;
  background: var(--color-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  background-image: 
    radial-gradient(ellipse at 20% 50%, rgba(61,126,255,0.06) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(61,126,255,0.04) 0%, transparent 50%);
}

#login-screen.hidden { display: none; }

.login-card {
  width: 360px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  box-shadow: var(--shadow-lg), 0 0 60px rgba(61,126,255,0.05);
  animation: loginFadeIn 0.4s ease;
}

@keyframes loginFadeIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.login-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 32px;
}

.login-logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.login-logo-icon svg { width: 20px; height: 20px; }

.login-logo-text {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.3px;
  color: var(--color-text);
}

.login-logo-text span {
  color: var(--color-accent);
}

.login-title {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.4px;
  margin-bottom: 6px;
}

.login-subtitle {
  color: var(--color-text-muted);
  font-size: 13px;
  margin-bottom: 28px;
}

.login-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 8px;
}

.pin-input-row {
  display: flex;
  gap: 8px;
  margin-bottom: 20px;
  justify-content: center;
}

.pin-digit {
  flex: none;
  width: 56px;
  height: 52px;
  background: var(--color-surface-2);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  font-size: 20px;
  font-family: var(--font-mono);
  font-weight: 500;
  text-align: center;
  outline: none;
  transition: var(--transition);
  -webkit-text-security: disc;
}

.pin-digit:focus {
  border-color: var(--color-accent);
  background: var(--color-surface-3);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.pin-digit.error {
  border-color: var(--color-danger);
  animation: shake 0.3s ease;
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

.login-error {
  color: var(--color-danger);
  font-size: 12px;
  margin-bottom: 16px;
  min-height: 16px;
}

.btn-login {
  width: 100%;
  height: 46px;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius-sm);
  color: #fff;
  font-family: var(--font-main);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: 0.2px;
}

.btn-login:hover { background: var(--color-accent-hover); transform: translateY(-1px); }
.btn-login:active { transform: translateY(0); }
.btn-login:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.login-lang {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 20px;
}

.login-lang button {
  background: none;
  border: none;
  color: var(--color-text-muted);
  font-size: 12px;
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 3px;
  transition: var(--transition);
}

.login-lang button.active,
.login-lang button:hover { color: var(--color-accent); }