:root {
  --primary: #2a9d8f;
  --primary-hover: #21867a;
  --bg-light: #ffffff;
  --bg-dark: #0f172a;
  --text-light: #f8fafc;
  --text-dark: #1e293b;
  --text-muted: #64748b;
  --border-light: #e2e8f0;
  --border-dark: #1e293b;
  --sidebar-width: 280px;
  --sidebar-collapsed-width: 60px;
  --transition: all 0.4s cubic-bezier(0.68, -0.55, 0.27, 1.55);

/* BODY & LAYOUT */
body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--bg-light);
  color: var(--text-dark);
  display: flex;
  min-height: 100vh;
}

/* SIDEBAR */
.sidebar-nature {
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  width: var(--sidebar-width);
  padding: 24px 0 70px; /* toggle buton için alt boşluk */
  display: flex;
  flex-direction: column;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-right: 1px solid var(--border-light);
  box-shadow: 5px 0 15px rgba(0, 0, 0, 0.05);
  transition: width 0.4s ease;
  overflow: hidden;
  z-index: 1000;
}

/* Sidebar daraltılmış hali (kapalı) */
.sidebar-nature.closed {
  width: var(--sidebar-collapsed-width);
}

/* PROFILE SECTION */
.profile-nature {
  text-align: center;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-light);
  padding: 0 16px 16px;
  transition: opacity 0.3s ease;
}

/* Profil adı ve rol kapalı sidebar da gizlenir */
.sidebar-nature.closed .profile-name-nature,
.sidebar-nature.closed .profile-role-nature {
  display: none;
}

/* Avatar boyutu küçülür */
.avatar-nature {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 12px;
  border: 0px solid var(--primary);
  box-shadow: 0 5px 15px rgba(42, 157, 143, 0.3);
  transition: width 0.3s ease, height 0.3s ease;
}

.sidebar-nature.closed .avatar-nature {
  width: 40px;
  height: 40px;
}

/* Profile name */
.profile-name-nature {
  font-weight: 600;
  font-size: 18px;
  color: var(--text-dark);
  margin-bottom: 4px;
}

/* Profile role */
.profile-role-nature {
  font-size: 14px;
  color: var(--primary);
  font-weight: 500;
  background: rgba(42, 157, 143, 0.1);
  padding: 4px 12px;
  border-radius: 20px;
}

/* NAVIGATION */
.nav-section-nature {
  padding: 0 8px;
  flex-grow: 1;
  overflow-y: auto;
}

.nav-links-nature {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.nav-link-nature {
  display: flex;
  align-items: center;
  padding: 12px 16px;
  border-radius: 8px;
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 500;
  font-size: 15px;
  transition: background-color 0.3s ease, color 0.3s ease;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Sadece ikon göster: metin gizle */
.sidebar-nature.closed .nav-link-nature span.link-text {
  display: none;
}

/* İkon ayarı */
.nav-link-nature i,
.nav-link-nature svg {
  margin-right: 12px;
  font-size: 18px;
  width: 24px;
  text-align: center;
  color: var(--primary);
  flex-shrink: 0;
}

/* Hover & active */
.nav-link-nature:hover {
  background: rgba(42, 157, 143, 0.1);
  color: var(--primary);
}

.nav-link-nature.active {
  background: rgba(42, 157, 143, 0.15);
  color: var(--primary);
  font-weight: 600;
}

/* THEME TOGGLE */
.theme-toggle-nature {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  margin: 16px;
  border-radius: 8px;
  background: rgba(42, 157, 143, 0.05);
  cursor: pointer;
  transition: background-color 0.3s ease;
}

.theme-toggle-nature:hover {
  background: rgba(42, 157, 143, 0.1);
}

.theme-toggle-text-nature {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-dark);
}

/* Sidebar kapalıyken theme toggle yazısı gizlensin */
.sidebar-nature.closed .theme-toggle-text-nature {
  display: none;
}

.theme-icon-nature {
  font-size: 18px;
  color: var(--text-dark);
}

/* TOGGLE BUTTON - Sidebar açma kapama butonu */
.toggle-sidebar-btn-nature {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background-color: var(--primary);
  color: white;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 3px 8px rgb(0 0 0 / 0.15);
  transition: background-color 0.3s ease;
  z-index: 1102;
}

.toggle-sidebar-btn-nature:hover {
  background-color: var(--primary-hover);
}

/* MAIN CONTENT */
.main-content {
  margin-left: var(--sidebar-width);
  padding: 24px;
  flex-grow: 1;
  transition: margin-left 0.4s ease;
}

/* Sidebar kapalıyken içerik sola kayar */
.sidebar-nature.closed ~ .main-content {
  margin-left: var(--sidebar-collapsed-width);
}

/* RESPONSIVE */

/* Mobilde sidebar gizli, toggle buton sabit */
@media (max-width: 768px) {
  .sidebar-nature {
    /* transform: translateX(-100%);  --> kaldır */
    width: var(--sidebar-collapsed-width) !important; /* küçük hali */
  }
  .sidebar-nature.active {
    width: var(--sidebar-width) !important; /* aktifse tam genişlik */
  }

  /* Toggle butonu sabit kalır */
  .toggle-sidebar-btn-nature {
    position: fixed;
    bottom: 20px;
    right: 20px;
  }

  /* İçerik margin azalt */
  .main-content {
    margin-left: var(--sidebar-collapsed-width) !important;
  }

  /* overlay ve body.sidebar-active kısımlarını kaldır veya devre dışı bırak */
  .overlay {
    display: none !important;
  }
}

  /* Eğer sidebar açık değilse içerik arka planda koyu overlay */
  body.sidebar-active .overlay {
    display: block;
  }
  .overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.5);
    z-index: 900;
  }
}

/* DARK MODE ÖRNEĞİ */
body.dark-mode {
  background: var(--bg-dark);
  color: var(--text-light);
}

body.dark-mode .sidebar-nature {
  background: rgba(15, 23, 42, 0.95);
  border-right: 1px solid rgba(255,255,255,0.1);
  color: var(--text-light);
}

body.dark-mode .nav-link-nature {
  color: var(--text-light);
}

body.dark-mode .nav-link-nature i {
  color: var(--primary);
}

body.dark-mode .theme-toggle-nature {
  background: rgba(42, 157, 143, 0.1);
}

body.dark-mode .toggle-sidebar-btn-nature {
  background-color: var(--primary);
  color: white;
}