/* ==========================================================================
   CSS RESET & GLOBAL STYLES
   ========================================================================== */

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

html, body {
  width: 100%;
  min-height: 100vh;
  overflow-x: hidden;
  font-family: 'Garamond', 'Times New Roman', Times, serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   THEME SYSTEM
   ========================================================================== */

:root {
  /* Dark Theme Defaults */
  --bg-color: #000000;
  --text-color: #c0c0c0;
  --border-color: rgba(255, 255, 255, 0.15);
  --toggle-bg: rgba(192, 192, 192, 0.1);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --glow-color: rgba(192, 192, 192, 0.6);
  --glow-shadow: 0 0 20px rgba(192, 192, 192, 0.4);
  --menu-bg: rgba(0, 0, 0, 0.98);
  --menu-btn-bg: rgba(128, 128, 128, 0.1);
  --menu-btn-hover: rgba(192, 192, 192, 0.2);
  --card-bg: rgba(128, 128, 128, 0.05);
  
  /* Animation */
  --transition-time: 0.3s;
  --transition-easing: cubic-bezier(0.4, 0, 0.2, 1);
}

/* Light Theme */
[data-theme="light"] {
  --bg-color: #707070;
  --text-color: #f0f0f0;
  --border-color: rgba(0, 0, 0, 0.15);
  --toggle-bg: rgba(240, 240, 240, 0.1);
  --shadow-color: rgba(0, 0, 0, 0.15);
  --glow-color: rgba(240, 240, 240, 0.6);
  --glow-shadow: 0 0 20px rgba(240, 240, 240, 0.4);
  --menu-bg: rgba(100, 100, 100, 0.98);
  --menu-btn-bg: rgba(140, 140, 140, 0.2);
  --menu-btn-hover: rgba(180, 180, 180, 0.3);
  --card-bg: rgba(140, 140, 140, 0.1);
}

/* ==========================================================================
   BODY & BASE STYLES
   ========================================================================== */

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: 
    background-color var(--transition-time) var(--transition-easing),
    color var(--transition-time) var(--transition-easing);
  min-height: 100vh;
  overflow-y: auto;
  overflow-x: hidden;
}

/* ==========================================================================
   TOGGLE BUTTONS - FIX FÜR ALLE GERÄTE
   ========================================================================== */

/* Theme Toggle Button - IMMER FIXIERT UND FUNKTIONAL */
button.theme-toggle {
  position: fixed !important;
  top: 20px !important;
  left: 20px !important;
  width: 50px !important;
  height: 50px !important;
  border-radius: 50% !important;
  border: 1px solid var(--border-color) !important;
  background: var(--toggle-bg) !important;
  color: var(--text-color) !important;
  cursor: pointer !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  backdrop-filter: blur(12px) !important;
  -webkit-backdrop-filter: blur(12px) !important;
  z-index: 10000 !important;
  transition: all var(--transition-time) var(--transition-easing) !important;
  padding: 0 !important;
  margin: 0 !important;
  outline: none !important;
  appearance: none !important;
  box-shadow: 0 4px 12px var(--shadow-color) !important;
  pointer-events: auto !important;
}

/* Burger Toggle Button - IMMER FIXIERT */
button.burger-btn {
  position: fixed !important;
  top: 20px !important;
  right: 20px !important;
  width: 50px !important;
  height: 50px !important;
  border-radius: 50% !important;
  border: 1px solid var(--border-color) !important;
  background: var(--toggle-bg) !important;
  color: var(--text-color) !important;
  cursor: pointer !important;
  display: flex !important;
  align-items: center !important;
  justify-content: center !important;
  backdrop-filter: blur(12px) !important;
  -webkit-backdrop-filter: blur(12px) !important;
  z-index: 9999 !important;
  transition: all var(--transition-time) var(--transition-easing) !important;
  padding: 0 !important;
  margin: 0 !important;
  outline: none !important;
  appearance: none !important;
  box-shadow: 0 4px 12px var(--shadow-color) !important;
  pointer-events: auto !important;
}

/* GLOW EFFECT für Toggle Buttons */
.theme-toggle::before, .burger-btn::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg, transparent, var(--glow-color), transparent);
  border-radius: 50%;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s var(--transition-easing);
}

/* Hover mit Glow - FUNKTIONIERT AUF ALLEN GERÄTEN */
.theme-toggle:hover::before, 
.theme-toggle:focus::before,
.burger-btn:hover::before,
.burger-btn:focus::before {
  opacity: 1;
  animation: glowPulse 2s infinite;
}

.theme-toggle:hover, 
.theme-toggle:focus,
.burger-btn:hover,
.burger-btn:focus {
  transform: scale(1.15) !important;
  box-shadow: 0 6px 20px var(--shadow-color), var(--glow-shadow) !important;
  border-color: var(--text-color) !important;
}

.theme-toggle:active,
.burger-btn:active {
  transform: scale(0.95) !important;
}

/* Hamburger Icon */
.burger-btn .hamburger {
  position: relative;
  width: 22px;
  height: 2px;
  background: currentColor;
  transition: all var(--transition-time) var(--transition-easing);
}

.burger-btn .hamburger::before,
.burger-btn .hamburger::after {
  content: '';
  position: absolute;
  width: 100%;
  height: 2px;
  background: currentColor;
  left: 0;
  transition: all var(--transition-time) var(--transition-easing);
}

.burger-btn .hamburger::before {
  top: -7px;
}

.burger-btn .hamburger::after {
  bottom: -7px;
}

/* Active/Expanded State for Burger */
.burger-btn[aria-expanded="true"] .hamburger {
  background: transparent;
  transform: rotate(45deg);
}

.burger-btn[aria-expanded="true"] .hamburger::before {
  transform: rotate(90deg) translateX(7px);
}

.burger-btn[aria-expanded="true"] .hamburger::after {
  transform: rotate(90deg) translateX(-7px);
}

/* ==========================================================================
   HEADER STYLES
   ========================================================================== */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 9998;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  background: var(--bg-color);
  opacity: 0;
  animation: fadeInHeader 0.8s ease forwards;
  animation-delay: 0.5s;
  height: auto;
  min-height: 100px;
  flex-direction: column;
  padding-top: 20px;
  padding-bottom: 20px;
}

/* Logo Container für bessere Zentrierung */
.logo-container {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  margin-bottom: 20px;
  z-index: 10001;
}

/* Logo im Header */
.header-logo {
  height: 100px;
  filter: drop-shadow(0 0 20px rgba(255, 255, 255, 0.5));
  transition: all 0.3s var(--transition-easing);
  cursor: pointer;
  object-fit: contain;
}

.header-logo:hover {
  transform: scale(1.2);
  filter: drop-shadow(0 0 30px var(--glow-color));
}

/* ==========================================================================
   DESKTOP NAVIGATION - UNTER DEM LOGO
   ========================================================================== */

.desktop-nav {
  display: none;
  justify-content: center;
  align-items: center;
  gap: 25px;
  width: 100%;
  margin-top: 10px;
  z-index: 10000;
}

.desktop-nav-link {
  color: var(--text-color);
  text-decoration: none;
  font-family: 'Garamond', serif;
  font-size: 18px;
  letter-spacing: 0.5px;
  padding: 12px 24px;
  border-radius: 8px;
  transition: all 0.3s var(--transition-easing);
  position: relative;
  overflow: hidden;
  background: var(--menu-btn-bg);
  border: 1px solid var(--border-color);
}

/* Glow Effect für Desktop Links */
.desktop-nav-link::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg, transparent, var(--glow-color), transparent);
  border-radius: 10px;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s var(--transition-easing);
}

.desktop-nav-link:hover::before,
.desktop-nav-link:focus::before {
  opacity: 1;
  animation: glowPulse 2s infinite;
}

.desktop-nav-link:hover,
.desktop-nav-link:focus {
  transform: translateY(-2px);
  box-shadow: var(--glow-shadow);
  border-color: var(--text-color);
}

/* ==========================================================================
   MOBILE MENU
   ========================================================================== */

.menu {
  background: var(--menu-bg) !important;
  border: 1px solid var(--border-color) !important;
  color: var(--text-color) !important;
  backdrop-filter: blur(25px) !important;
  -webkit-backdrop-filter: blur(25px) !important;
  padding: 25px !important;
  border-radius: 16px !important;
  min-width: 240px !important;
  max-width: 300px !important;
  z-index: 10002 !important;
  position: absolute !important;
  top: 90px !important;
  right: 20px !important;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3) !important;
  animation: menuSlideIn 0.4s var(--transition-easing) forwards;
  overflow: hidden;
}

/* Menu Buttons */
.menu-btn {
  display: flex !important;
  align-items: center !important;
  gap: 15px !important;
  padding: 16px 20px !important;
  text-decoration: none !important;
  color: var(--text-color) !important;
  background: var(--menu-btn-bg) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: 10px !important;
  transition: all 0.3s var(--transition-easing) !important;
  margin-bottom: 12px !important;
  position: relative;
  overflow: hidden;
  outline: none !important;
  font-family: 'Garamond', serif !important;
  font-size: 17px !important;
  letter-spacing: 0.5px !important;
  cursor: pointer !important;
  width: 100% !important;
  text-align: left !important;
}

/* Glow Effect für Menu Buttons */
.menu-btn::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg, transparent, var(--glow-color), transparent);
  border-radius: 12px;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s var(--transition-easing);
}

.menu-btn:hover::before,
.menu-btn:focus::before {
  opacity: 1;
  animation: glowPulse 2s infinite;
}

/* Hover Effect */
.menu-btn:hover,
.menu-btn:focus {
  background: var(--menu-btn-hover) !important;
  transform: translateX(8px) !important;
  box-shadow: var(--glow-shadow) !important;
  border-color: var(--text-color) !important;
}

/* Icons */
.menu-btn::after {
  font-size: 20px;
  width: 24px;
  text-align: center;
  flex-shrink: 0;
  content: attr(data-icon);
}

/* Menu Divider */
.menu-divider {
  height: 1px;
  background: var(--border-color);
  margin: 20px 0;
  opacity: 0.3;
}

/* Menu Footer */
.menu-footer {
  font-size: 13px;
  color: var(--text-color);
  opacity: 0.5;
  text-align: center;
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border-color);
  font-family: system-ui, sans-serif;
}

/* ==========================================================================
   MAIN CONTENT
   ========================================================================== */

.main-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem 2rem;
  width: 100%;
  margin-top: 140px; /* Platz für den Header */
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */

@keyframes flyUp3D {
  0% { 
    transform: translate3d(0, 0, -200px) rotateX(0) rotateY(0) rotateZ(0); 
    opacity: 0; 
  }
  15% { 
    opacity: 1; 
  }
  100% { 
    transform: translate3d(0, -130vh, 400px) rotateX(0) rotateY(0) rotateZ(0); 
    opacity: 0; 
  }
}

@keyframes menuSlideIn {
  from {
    opacity: 0;
    transform: translateY(-15px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes fadeInHeader {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes glowPulse {
  0%, 100% {
    opacity: 0.7;
    box-shadow: 0 0 15px var(--glow-color);
  }
  50% {
    opacity: 1;
    box-shadow: 0 0 25px var(--glow-color);
  }
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */

/* Desktop (ab 1024px) - Menü unter Logo, Burger ausblenden */
@media (min-width: 1024px) {
  .header {
    height: auto;
    min-height: 180px;
    padding-top: 30px;
    padding-bottom: 20px;
    justify-content: center;
  }
  
  .logo-container {
    margin-bottom: 25px;
  }
  
  .header-logo {
    height: 120px;
  }
  
  .desktop-nav {
    display: flex !important;
    flex-wrap: wrap;
    justify-content: center;
    gap: 20px;
    max-width: 90%;
    margin: 0 auto;
  }
  
  .desktop-nav-link {
    padding: 10px 20px;
    font-size: 17px;
  }
  
  /* Burger Button auf Desktop ausblenden */
  .burger-btn {
    display: none !important;
  }
  
  .menu {
    display: none !important;
  }
  
  .main-content {
    margin-top: 180px;
    min-height: calc(100vh - 180px);
  }
  
  .theme-toggle, .burger-btn {
    width: 55px !important;
    height: 55px !important;
  }
  
  .theme-toggle {
    top: 25px !important;
    left: 25px !important;
  }
}

/* Tablet (768px - 1023px) */
@media (max-width: 1023px) and (min-width: 769px) {
  .desktop-nav {
    display: none !important;
  }
  
  .header {
    flex-direction: row;
    justify-content: space-between;
    height: 100px;
    padding-top: 0;
    padding-bottom: 0;
  }
  
  .logo-container {
    width: auto;
    margin-bottom: 0;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
  }
  
  .header-logo {
    height: 80px;
  }
  
  .theme-toggle, .burger-btn {
    width: 52px !important;
    height: 52px !important;
  }
  
  .main-content {
    margin-top: 100px;
    min-height: calc(100vh - 100px);
  }
}

/* Mobile (768px und kleiner) */
@media (max-width: 768px) {
  .header {
    flex-direction: row;
    justify-content: space-between;
    height: 90px;
    padding: 0 15px;
    padding-top: 0;
    padding-bottom: 0;
  }
  
  .logo-container {
    width: auto;
    margin-bottom: 0;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
  }
  
  .header-logo {
    height: 70px;
  }
  
  .theme-toggle, .burger-btn {
    width: 48px !important;
    height: 48px !important;
    top: 20px !important;
  }
  
  .theme-toggle {
    left: 15px !important;
  }
  
  .burger-btn {
    right: 15px !important;
  }
  
  .menu {
    top: 90px !important;
    right: 15px !important;
    min-width: 220px !important;
    max-width: 280px !important;
    padding: 20px !important;
  }
  
  .main-content {
    margin-top: 90px;
    min-height: calc(100vh - 90px);
    padding: 2rem 1.5rem;
  }
}

/* Kleine Smartphones (480px und kleiner) */
@media (max-width: 480px) {
  .header {
    height: 85px;
  }
  
  .header-logo {
    height: 65px;
  }
  
  .theme-toggle, .burger-btn {
    width: 44px !important;
    height: 44px !important;
    top: 20px !important;
  }
  
  .theme-toggle {
    left: 15px !important;
  }
  
  .burger-btn {
    right: 15px !important;
  }
  
  .menu {
    top: 85px !important;
    right: 15px !important;
    min-width: 200px !important;
    max-width: 260px !important;
    padding: 18px !important;
  }
  
  .menu-btn {
    padding: 14px 18px !important;
    font-size: 16px !important;
    gap: 12px !important;
  }
}
/* ==========================================================================
   PUBLIKATIONEN PAGE
   ========================================================================== */

/* Glow Effects für Cards */
.book-cover, .method-card, .fact-item {
  position: relative;
  overflow: hidden;
}

.book-cover::before,
.method-card::before,
.fact-item::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  background: linear-gradient(45deg, transparent, var(--glow-color), transparent);
  border-radius: inherit;
  z-index: -1;
  opacity: 0;
  transition: opacity 0.3s var(--transition-easing);
}

.book-cover:hover::before,
.method-card:hover::before,
.fact-item:hover::before {
  opacity: 0.3;
}

/* Animation für Tab-Wechsel */
.publication-detail {
  animation: fadeIn 0.5s var(--transition-easing);
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive Optimierungen */
@media (max-width: 1024px) {
  .publication-header {
    grid-template-columns: 250px 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .tabs {
    width: 100%;
    max-width: 100%;
  }
  
  .tab-btn {
    flex: 1;
    min-width: auto;
  }
}
/* ==========================================================================
   ACCESSIBLE LOGO BUTTON
   ========================================================================== */

.logo-button {
  background: transparent;
  border: none;
  padding: 0;
  margin: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  outline: none;
  transition: transform 0.3s var(--transition-easing);
}

/* Keyboard-Focus für Barrierefreiheit */
.logo-button:focus {
  outline: 2px solid var(--glow-color);
  outline-offset: 4px;
  border-radius: 8px;
}

/* Hover-Effekt auf den Button übertragen */
.logo-button:hover .header-logo {
  transform: scale(1.2);
  filter: drop-shadow(0 0 30px var(--glow-color));
}

/* Entferne den Hover-Effekt vom img selbst */
.header-logo {
  cursor: inherit;
  transition: all 0.3s var(--transition-easing);
}
/* ==========================================================================
   HEADER STYLES - FIX FÜR THEME-ANPASSUNG
   ========================================================================== */

.header {
  position: relative;
  width: 100%;
  padding: 1.5rem 2rem;
  background-color: var(--header-bg, var(--bg-color));
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 999;
  transition: all var(--transition-time) var(--transition-easing);
}

/* Theme-spezifische Header-Farben */
[data-theme="dark"] .header {
  --header-bg: #000000;
  background-color: var(--header-bg);
}

[data-theme="light"] .header {
  --header-bg: #707070;
  background-color: var(--header-bg);
}

/* Logo Container */
.logo-container {
  display: flex;
  align-items: center;
}

.logo-button {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  transition: transform 0.3s ease;
}

.logo-button:hover {
  transform: scale(1.05);
}

.header-logo {
  height: 60px;
  width: auto;
  max-width: 240px;
  object-fit: contain;
}

/* Desktop Navigation */
.desktop-nav {
  display: flex;
  gap: 2rem;
  align-items: center;
}

@media (max-width: 1023px) {
  .desktop-nav {
    display: none; /* Auf Mobile ausblenden */
  }
}

.desktop-nav-link {
  color: var(--text-color);
  text-decoration: none;
  font-size: 1.1rem;
  font-family: 'Garamond', serif;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: all 0.3s ease;
  position: relative;
}

.desktop-nav-link:hover {
  color: var(--glow-color);
  background: rgba(192, 192, 192, 0.1);
}

.desktop-nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background: var(--glow-color);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

.desktop-nav-link:hover::after {
  width: 80%;
}
/* ==========================================================================
   BURGER MENU - MOBILE STYLES
   ========================================================================== */

/* Burger Button - Nur auf Mobile sichtbar */
@media (max-width: 1023px) {
  .burger-btn {
    display: flex !important; /* Auf Mobile anzeigen */
  }
  
  .desktop-nav {
    display: none !important; /* Desktop-Nav auf Mobile ausblenden */
  }
}

@media (min-width: 1024px) {
  .burger-btn {
    display: none !important; /* Auf Desktop ausblenden */
  }
}

/* Mobile Menu Overlay */
.menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: var(--menu-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 9998;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  transform: translateX(100%);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Menu Buttons */
.menu-btn {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  max-width: 300px;
  padding: 1.2rem 1.5rem;
  margin: 0.5rem 0;
  background: var(--menu-btn-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  color: var(--text-color);
  text-decoration: none;
  font-size: 1.2rem;
  font-family: 'Garamond', serif;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.menu-btn:hover {
  background: var(--menu-btn-hover);
  transform: translateX(10px);
  border-color: var(--glow-color);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.menu-btn::before {
  content: attr(data-icon);
  font-size: 1.5rem;
}

/* Menu Divider */
.menu-divider {
  width: 80%;
  max-width: 250px;
  height: 1px;
  background: var(--border-color);
  margin: 1.5rem 0;
  opacity: 0.3;
}

/* Menu Footer */
.menu-footer {
  margin-top: 2rem;
  color: var(--text-color);
  opacity: 0.7;
  font-size: 0.9rem;
  text-align: center;
  padding: 1rem;
  border-top: 1px solid var(--border-color);
  width: 100%;
  max-width: 300px;
}
/* In static/app.css oder src/app.css */

/* Light Theme für Newsletter Popup */
[data-theme="light"] .newsletter-popup {
  background: #f5f5f5;
  border: 1px solid #dddddd;
  color: #000000;
}

[data-theme="light"] .popup-header h2,
[data-theme="light"] .popup-description,
[data-theme="light"] .form-group label,
[data-theme="light"] .preferences-title,
[data-theme="light"] .checkbox-label {
  color: #000000;
}

[data-theme="light"] .form-group input {
  background: #ffffff;
  border: 1px solid #cccccc;
  color: #000000;
}

[data-theme="light"] .preferences {
  background: #eeeeee;
  border: 1px solid #dddddd;
}

[data-theme="light"] .submit-btn {
  background: #000000;
  color: #ffffff;
}

[data-theme="light"] .close-btn {
  background: rgba(0, 0, 0, 0.1);
  border: 1px solid rgba(0, 0, 0, 0.2);
  color: #000000;
}

[data-theme="light"] .privacy-note {
  color: #666666;
}

[data-theme="light"] .privacy-note a {
  color: #000000;
}

/* ==========================================================================
   CSS FÜR DESKTOP-NAVIGATION VERSTECKEN
   ========================================================================== */
.desktop-nav-hidden {
  opacity: 0 !important;
  transform: translateY(-20px) !important;
  pointer-events: none !important;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
}
/* ==========================================================================
   SCROLL-TO-TOP BUTTON (GLOBAL)
   ========================================================================== */

.scroll-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(192, 192, 192, 0.1);
  border: 1px solid var(--glow-color);
  color: var(--text-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  z-index: 9999;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  opacity: 0;
  animation: fadeIn 0.3s ease forwards;
}

.scroll-to-top:hover {
  background: rgba(192, 192, 192, 0.2);
  transform: translateY(-5px);
  box-shadow: 0 0 20px var(--glow-color);
  border-color: var(--text-color);
}

.scroll-to-top svg {
  transition: transform 0.3s ease;
}

.scroll-to-top:hover svg {
  transform: translateY(-2px);
}

/* Animation für das Einblenden des Buttons */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}