/* === Reset & Base === */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 14px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: #f0f2f5;
  color: #333;
  display: flex;
  min-height: 100vh;
}

/* === Sidebar === */
.sidebar {
  width: 260px;
  min-width: 260px;
  background: #1a1a2e;
  color: #e0e0e0;
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 24px 20px 16px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.logo {
  font-size: 1.6rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 1px;
}

.logo-sub {
  font-size: 0.75rem;
  color: #888;
  margin-top: 2px;
}

.sidebar-section {
  padding: 16px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.sidebar-label {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #888;
  margin-bottom: 8px;
}

.sidebar-select {
  width: 100%;
  padding: 8px 10px;
  border-radius: 6px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: #16213e;
  color: #e0e0e0;
  font-size: 0.85rem;
  cursor: pointer;
  outline: none;
}

.sidebar-select:focus {
  border-color: #4a6cf7;
}

.sidebar-select option {
  background: #16213e;
  color: #e0e0e0;
}

/* === Navigation === */
.sidebar-nav {
  flex: 1;
  padding: 12px 10px;
  overflow-y: auto;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  color: #c0c0c0;
  text-decoration: none;
  font-size: 0.85rem;
  transition: background 0.2s, color 0.2s;
  margin-bottom: 2px;
}

.nav-link:hover:not(.disabled) {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
}

.nav-link.active {
  background: #4a6cf7;
  color: #fff;
  font-weight: 600;
}

.nav-link.disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

.nav-icon {
  font-size: 1rem;
  width: 20px;
  text-align: center;
}

/* === Sidebar Toggle (mobile) === */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  background: #1a1a2e;
  color: #fff;
  border: none;
  border-radius: 8px;
  width: 40px;
  height: 40px;
  font-size: 1.2rem;
  cursor: pointer;
}

/* === Content Area === */
.content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.content-inner {
  padding: 24px;
  flex: 1;
}

/* === Responsive === */
@media (max-width: 900px) {
  .sidebar {
    position: fixed;
    left: 0;
    top: 0;
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-toggle {
    display: block;
  }

  .content-inner {
    padding: 16px;
    padding-top: 60px;
  }
}