:root {
  --background-light: #f4f6f8;
  --background-dark: #1e293b;
  --sidebar-bg: #0f172a;
  --primary-accent: #3b82f6;
  --primary-accent-hover: #2563eb;
  --text-light: #f8fafc;
  --text-dark: #1e293b;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;
  --card-bg: #ffffff;
  --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --border-radius: 8px;
  --error-bg: #fee2e2;
  --error-text: #b91c1c;
  --error-border: #fca5a5;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--background-light);
  color: var(--text-dark);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#root {
  width: 100%;
  min-height: 100vh;
}

/* --- Login Page --- */
.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem;
  background-color: var(--background-dark);
}

.login-form {
  width: 100%;
  max-width: 400px;
  padding: 2.5rem;
  background-color: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
  text-align: center;
}

.login-form h1 {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
  color: var(--text-dark);
}

.login-form p {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

.error-message {
    background-color: var(--error-bg);
    color: var(--error-text);
    border: 1px solid var(--error-border);
    padding: 0.75rem 1rem;
    margin-bottom: 1.5rem;
    border-radius: var(--border-radius);
    text-align: center;
    font-size: 0.9rem;
}

.input-group {
  margin-bottom: 1.5rem;
  text-align: left;
}

.input-group label {
  display: block;
  font-weight: 500;
  margin-bottom: 0.5rem;
}

.input-group input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 1rem;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.input-group input:focus {
  outline: none;
  border-color: var(--primary-accent);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.login-button {
  width: 100%;
  padding: 0.8rem 1rem;
  border: none;
  border-radius: var(--border-radius);
  background-color: var(--primary-accent);
  color: var(--text-light);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s, opacity 0.2s;
}

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

.login-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}


.login-footer {
  margin-top: 1.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* --- Main App Layout --- */
.app-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background-color: var(--sidebar-bg);
  color: var(--text-light);
  display: flex;
  flex-direction: column;
  padding: 1.5rem 1rem;
  transition: width 0.3s ease;
}

.sidebar-header {
  font-size: 1.5rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 2.5rem;
  color: var(--text-light);
}

.sidebar-nav {
  flex-grow: 1;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 0.8rem 1rem;
  margin-bottom: 0.5rem;
  border-radius: var(--border-radius);
  color: var(--text-muted);
  text-decoration: none;
  font-weight: 500;
  transition: background-color 0.2s, color 0.2s;
}

.nav-link:hover, .nav-link.active {
  background-color: #1e293b;
  color: var(--text-light);
}

.nav-link svg {
  margin-right: 1rem;
  width: 20px;
  height: 20px;
}

.profile-section {
  border-top: 1px solid #334155;
  padding-top: 1.5rem;
  margin-top: 1rem;
}

.profile-link, .logout-button {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 0.8rem 1rem;
  border-radius: var(--border-radius);
  text-decoration: none;
  font-weight: 500;
  color: var(--text-muted);
  background: none;
  border: none;
  font-family: inherit;
  font-size: 1rem;
  cursor: pointer;
  text-align: left;
  transition: background-color 0.2s, color 0.2s;
}

.profile-link:hover, .logout-button:hover {
  background-color: #1e293b;
  color: var(--text-light);
}

.profile-link svg, .logout-button svg {
  margin-right: 1rem;
  width: 20px;
  height: 20px;
}

.main-content {
  flex-grow: 1;
  padding: 2rem;
  background-color: var(--background-light);
}

.main-content h1 {
  font-size: 2rem;
  margin-bottom: 2rem;
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
  .app-layout {
    flex-direction: column;
  }
  
  .sidebar {
    width: 100%;
    height: auto;
    flex-direction: row;
    align-items: center;
    padding: 1rem;
  }
  
  .sidebar-header {
    margin: 0;
  }
  
  .sidebar-nav {
    display: flex;
    flex-grow: 1;
    justify-content: flex-start;
    margin-left: 1rem;
  }
  
  .nav-link {
    margin: 0 0.25rem;
  }

  .nav-link span {
    display: none; /* Hide text on mobile nav */
  }

  .nav-link svg {
    margin-right: 0;
  }

  .profile-section {
    border: none;
    padding: 0;
    margin: 0;
    margin-left: auto;
    display: flex;
  }

  .profile-link span, .logout-button span {
     display: none;
  }
  .profile-link svg, .logout-button svg {
    margin: 0;
  }
}