/* Import moderního fontu z Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  /* Barevná paleta */
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --bg-color: #f1f5f9;
  --card-bg: #ffffff;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --border-color: #cbd5e1;
  --focus-ring: rgba(37, 99, 235, 0.2);
  --error: #ef4444;
  --success: #10b981;
}

/* Reset základních stylů */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--bg-color);
  color: var(--text-main);
  /* Toto vycentruje obsah doprostřed obrazovky */
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 1rem;
}

/* Karta (bílý box s formulářem) */
.login-container {
  background-color: var(--card-bg);
  width: 100%;
  max-width: 400px;
  padding: 2.5rem 2rem;
  border-radius: 16px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
  text-align: center;
}

.login-container h1 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.login-container p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

/* Formulář a inputy */
form {
  display: flex;
  flex-direction: column;
  gap: 1.2rem; /* Mezera mezi políčky */
  text-align: left;
}

label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-main);
  margin-bottom: 0.4rem;
  display: block;
}

input[type="number"],
input[type="password"],
input[type="text"] {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-family: inherit;
  color: var(--text-main);
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  transition: all 0.2s ease;
}

/* Efekt při kliknutí do políčka */
input:focus {
  outline: none;
  border-color: var(--primary);
  background-color: #fff;
  box-shadow: 0 0 0 4px var(--focus-ring);
}

/* Tlačítko */
button {
  width: 100%;
  padding: 0.875rem;
  background-color: var(--primary);
  color: white;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 0.2s ease, transform 0.1s ease;
  margin-top: 0.5rem;
}

button:hover {
  background-color: var(--primary-hover);
}

button:active {
  transform: scale(0.98); /* Jemné zmáčknutí */
}

/* Zprávy (chyby/úspěch) */
.message {
  margin-top: 1rem;
  font-size: 0.9rem;
  font-weight: 500;
  min-height: 20px;
}

.message.error { color: var(--error); }
.message.success { color: var(--success); }

/* Úpravy pro dashboard (až půjdete dál) */
.dashboard-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  background: var(--card-bg);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  z-index: 10;
}

.dashboard-header button {
  width: auto;
  padding: 0.5rem 1rem;
  background-color: var(--text-muted);
}

.dashboard-header button:hover {
  background-color: var(--text-main);
}

.dashboard-content {
  margin-top: 80px;
  width: 100%;
  max-width: 900px;
  padding: 2rem;
}