/* ===============
   Futuristische Design Tokens
   =============== */
:root {
  /* Futuristische Farbpalette - Light Theme */
  --primary: #00d4ff;
  --primary-2: #ff007c;
  --primary-3: #7c3aed;
  --accent-cyan: #22d3ee;
  --accent-purple: #a855f7;
  --accent-pink: #ec4899;
  --accent-yellow: #fbbf24;
  
  /* Backgrounds mit Glasmorphismus */
  --bg-primary: #f8fafc;
  --bg-surface: rgba(255, 255, 255, 0.7);
  --bg-elevated: rgba(255, 255, 255, 0.85);
  --bg-panel: rgba(248, 250, 252, 0.9);
  
  /* Text mit optimierten Kontrasten */
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  
  /* Borders und Effekte */
  --border-light: rgba(0, 212, 255, 0.2);
  --border-glow: rgba(0, 212, 255, 0.4);
  --shadow-base: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-elevated: 0 12px 48px rgba(0, 0, 0, 0.18);
  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.3);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary), var(--accent-cyan));
  --gradient-secondary: linear-gradient(135deg, var(--primary-2), var(--accent-pink));
  --gradient-bg: radial-gradient(ellipse 80% 50% at 20% -20%, rgba(0, 212, 255, 0.1) 0%, transparent 60%),
                 radial-gradient(ellipse 60% 40% at 90% 120%, rgba(124, 58, 237, 0.08) 0%, transparent 60%),
                 linear-gradient(135deg, #f8fafc 0%, #e2e8f0 50%, #f1f5f9 100%);
}

html[data-theme="dark"] {
  /* Futuristische Farbpalette - Dark Theme */
  --primary: #00f5ff;
  --primary-2: #ff1493;
  --primary-3: #9333ea;
  --accent-cyan: #06b6d4;
  --accent-purple: #8b5cf6;
  --accent-pink: #f472b6;
  --accent-yellow: #fbbf24;
  
  /* Backgrounds mit Glasmorphismus */
  --bg-primary: #0a0a0f;
  --bg-surface: rgba(15, 23, 42, 0.8);
  --bg-elevated: rgba(30, 41, 59, 0.9);
  --bg-panel: rgba(15, 23, 42, 0.95);
  
  /* Text mit optimierten Kontrasten */
  --text-primary: #f8fafc;
  --text-secondary: #e2e8f0;
  --text-muted: #94a3b8;
  --text-inverse: #0f172a;
  
  /* Borders und Effekte */
  --border-light: rgba(0, 245, 255, 0.3);
  --border-glow: rgba(0, 245, 255, 0.6);
  --shadow-base: 0 12px 40px rgba(0, 0, 0, 0.4);
  --shadow-elevated: 0 16px 64px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 40px rgba(0, 245, 255, 0.4);
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, var(--primary), var(--accent-cyan));
  --gradient-secondary: linear-gradient(135deg, var(--primary-2), var(--accent-pink));
  --gradient-bg: radial-gradient(ellipse 80% 50% at 20% -20%, rgba(0, 245, 255, 0.15) 0%, transparent 60%),
                 radial-gradient(ellipse 60% 40% at 90% 120%, rgba(147, 51, 234, 0.1) 0%, transparent 60%),
                 linear-gradient(135deg, #0a0a0f 0%, #1e293b 50%, #0f172a 100%);
}

/* ===============
   Futuristische Animationen
   =============== */
@keyframes glow-pulse {
  0%, 100% { box-shadow: var(--shadow-base); }
  50% { box-shadow: var(--shadow-glow); }
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-3px); }
}

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

@keyframes bg-pan {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes shimmer {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(100%); }
}

@keyframes neon-glow {
  0%, 100% { filter: drop-shadow(0 0 5px currentColor); }
  50% { filter: drop-shadow(0 0 20px currentColor) drop-shadow(0 0 40px currentColor); }
}

/* ===============
   Base Styles
   =============== */
* { 
  box-sizing: border-box; 
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html, body { height: 100%; }

body {
  margin: 0;
  font-family: 'Inter', 'Roboto', system-ui, -apple-system, Segoe UI, Arial, sans-serif;
  color: var(--text-primary);
  background: var(--gradient-bg) fixed;
  background-size: 200% 200%;
  animation: bg-pan 20s linear infinite;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* ===============
   Futuristischer Header
   =============== */
.app {
  max-width: 1200px;
  margin: 0 auto;
  padding: clamp(16px, 3vw, 32px);
  display: grid;
  gap: 30px;
  animation: slide-in 0.8s ease-out;
}

.app__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
  padding: 20px 30px;
  background: var(--bg-elevated);
  border: 2px solid var(--border-light);
  border-radius: 20px;
  box-shadow: var(--shadow-elevated);
  backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
}

.app__header::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(0, 212, 255, 0.1), transparent);
  animation: shimmer 3s infinite;
}

.brand {
  display: flex;
  align-items: center;
  gap: 15px;
  text-decoration: none;
  color: inherit;
  position: relative;
  z-index: 1;
}

.brand i {
  font-size: 2rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: neon-glow 2s ease-in-out infinite;
}

h1 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0;
  font-weight: 800;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 15px;
  position: relative;
  z-index: 1;
}

.icon-button {
  height: 45px;
  width: 45px;
  border-radius: 15px;
  display: grid;
  place-items: center;
  background: var(--bg-surface);
  border: 2px solid var(--border-light);
  box-shadow: var(--shadow-base);
  color: var(--text-primary);
  cursor: pointer;
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.icon-button::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.icon-button:hover {
  transform: translateY(-2px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.icon-button:hover::before {
  opacity: 0.1;
}

/* ===============
   Navigation Tabs - Futuristisch
   =============== */
.nav-tabs {
  background: var(--bg-elevated);
  border: 2px solid var(--border-light);
  border-radius: 20px;
  padding: 12px;
  margin-bottom: 30px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  box-shadow: var(--shadow-elevated);
  backdrop-filter: blur(20px);
  position: relative;
}

.nav-tabs::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 20px 20px 0 0;
}

.nav-tab {
  padding: 14px 18px;
  border: 2px solid transparent;
  background: var(--bg-surface);
  color: var(--text-secondary);
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 10px;
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.nav-tab::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.nav-tab.active {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
  font-weight: 700;
}

.nav-tab:hover:not(.active) {
  border-color: var(--border-light);
  transform: translateY(-1px);
}

.nav-tab:hover:not(.active)::before {
  opacity: 0.1;
}

/* ===============
   Language Switcher - Futuristisch
   =============== */
.language-switcher {
  display: flex;
  gap: 8px;
  background: var(--bg-surface);
  border: 2px solid var(--border-light);
  border-radius: 12px;
  padding: 4px;
  backdrop-filter: blur(10px);
}

.lang-btn {
  padding: 8px 14px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
  position: relative;
  overflow: hidden;
}

.lang-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.lang-btn.active {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.4);
}

.lang-btn:hover:not(.active)::before {
  opacity: 0.1;
}

/* ===============
   Content Sections - Futuristisch
   =============== */
.content-section {
  margin: 50px 0;
  padding: 30px;
  background: var(--bg-elevated);
  border: 2px solid var(--border-light);
  border-radius: 25px;
  box-shadow: var(--shadow-elevated);
  backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
}

.content-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--gradient-primary);
  border-radius: 25px 25px 0 0;
}

.content-section h2 {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 20px;
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.content-section h3 {
  color: var(--text-primary);
  margin: 30px 0 15px;
  font-size: 1.4rem;
  font-weight: 700;
}

.content-section p {
  line-height: 1.7;
  margin-bottom: 20px;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.content-section ul {
  list-style: none;
  padding: 0;
}

.content-section li {
  padding: 12px 0;
  padding-left: 30px;
  position: relative;
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.content-section li::before {
  content: "▶";
  position: absolute;
  left: 0;
  color: var(--primary);
  font-weight: bold;
  animation: neon-glow 3s ease-in-out infinite;
}

/* ===============
   FAQ Section - Futuristisch
   =============== */
.faq-item {
  margin-bottom: 20px;
  border: 2px solid var(--border-light);
  border-radius: 15px;
  overflow: hidden;
  backdrop-filter: blur(10px);
  background: var(--bg-surface);
}

.faq-question {
  padding: 20px 25px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
  color: var(--text-primary);
  position: relative;
  overflow: hidden;
}

.faq-question::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.faq-question:hover::before {
  opacity: 0.1;
}

.faq-answer {
  padding: 0 25px;
  max-height: 0;
  overflow: hidden;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  background: var(--bg-elevated);
}

.faq-answer.open {
  padding: 20px 25px;
  max-height: 400px;
}

.faq-answer p {
  color: var(--text-secondary);
  margin: 0;
}

.faq-icon {
  transition: transform 0.3s ease;
  color: var(--primary);
}

.faq-icon.open {
  transform: rotate(180deg);
}

/* ===============
   Layout - Futuristisch
   =============== */
.app__main {
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: 30px;
}

@media (max-width: 980px) {
  .app__main { grid-template-columns: 1fr; }
}

.panel {
  background: var(--bg-elevated);
  border: 2px solid var(--border-light);
  border-radius: 25px;
  box-shadow: var(--shadow-elevated);
  backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
}

.panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
  border-radius: 25px 25px 0 0;
}

.panel__body {
  padding: clamp(20px, 3vw, 35px);
  position: relative;
  z-index: 1;
}

.panel__header {
  padding: 20px 25px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
  color: var(--text-secondary);
  font-weight: 600;
  position: relative;
  z-index: 1;
}

.panel-title-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.panel-title-group i {
  color: var(--primary);
  animation: neon-glow 3s ease-in-out infinite;
}

.playlist-panel {
  display: flex;
  flex-direction: column;
}

/* ===============
   Uploader - Futuristisch
   =============== */
.uploader {
  margin-bottom: 20px;
}

.uploader__label {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-surface);
  color: var(--text-primary);
  font-weight: 600;
  padding: 16px 24px;
  border-radius: 15px;
  border: 2px solid var(--border-light);
  box-shadow: var(--shadow-base);
  cursor: pointer;
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.uploader__label::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.uploader__label:hover {
  transform: translateY(-2px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.uploader__label:hover::before {
  opacity: 0.1;
}

.uploader__label i {
  font-size: 1.2rem;
  color: var(--primary);
}

#fileInput { display: none; }

.meta {
  display: grid;
  gap: 8px;
  margin-bottom: 15px;
}

.current-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
}

/* ===============
   Visualizer - Futuristisch
   =============== */
.visualizer {
  width: min(540px, 90vw);
  aspect-ratio: 1 / 1;
  background: #000;
  border: 3px solid var(--border-glow);
  border-radius: 20px;
  margin: 20px 0 15px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-glow), inset 0 0 50px rgba(0, 212, 255, 0.1);
  animation: glow-pulse 4s ease-in-out infinite;
}

#vizCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  border-radius: 17px;
}

/* ===============
   Visualizer Controls - Futuristisch
   =============== */
.viz-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-top: 15px;
  margin-bottom: 12px;
}

@media (max-width: 680px) {
  .viz-controls { grid-template-columns: 1fr; }
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
  text-shadow: 0 0 10px rgba(0, 212, 255, 0.3);
}

.viz-controls select,
.viz-controls input[type="range"] {
  width: 100%;
}

.viz-controls select {
  appearance: none;
  padding: 12px 16px;
  border-radius: 12px;
  border: 2px solid var(--border-light);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-weight: 600;
  box-shadow: var(--shadow-base);
  backdrop-filter: blur(10px);
  cursor: pointer;
}

.viz-controls select:focus {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
  outline: none;
}

.viz-controls input[type="range"] {
  height: 8px;
  background: var(--bg-surface);
  border-radius: 4px;
  border: 2px solid var(--border-light);
  outline: none;
  cursor: pointer;
}

.viz-controls input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  height: 20px;
  width: 20px;
  border-radius: 50%;
  background: var(--gradient-primary);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

/* ===============
   Progress Bar - Futuristisch
   =============== */
.progress-container {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 15px;
  margin-top: 12px;
}

.timechip {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.progress-bar {
  height: 12px;
  background: var(--bg-surface);
  border: 2px solid var(--border-light);
  border-radius: 10px;
  position: relative;
  overflow: hidden;
  cursor: pointer;
  outline: none;
  backdrop-filter: blur(10px);
}

.progress-bar > div {
  width: 0%;
  height: 100%;
  background: var(--gradient-primary);
  border-radius: inherit;
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.5);
  transition: width 0.15s linear;
  position: relative;
}

.progress-bar > div::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 4px;
  height: 100%;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 0 10px 10px 0;
}

/* ===============
   Volume Control - Futuristisch
   =============== */
.volume-control {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-top: 18px;
  color: var(--text-secondary);
}

.volume-control i {
  font-size: 1.2rem;
  color: var(--primary);
}

.volume-control input[type="range"] {
  width: min(360px, 70vw);
  height: 6px;
  background: var(--bg-surface);
  border-radius: 3px;
  border: 2px solid var(--border-light);
  outline: none;
  cursor: pointer;
}

.volume-control input[type="range"]::-webkit-slider-thumb {
  appearance: none;
  height: 18px;
  width: 18px;
  border-radius: 50%;
  background: var(--gradient-primary);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

.pill-button {
  padding: 10px 16px;
  border-radius: 20px;
  border: 2px solid var(--border-light);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-base);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.pill-button::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.pill-button:hover {
  transform: translateY(-1px);
  border-color: var(--border-glow);
}

.pill-button:hover::before {
  opacity: 0.1;
}

.pill-button.active-mode {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

/* ===============
   Controls - Futuristisch
   =============== */
.audio-controls {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 15px;
  margin-top: 20px;
}

.control-button {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 2px solid var(--border-light);
  border-radius: 15px;
  padding: 16px 12px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: var(--shadow-base);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.control-button::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.control-button:hover {
  transform: translateY(-2px);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.control-button:hover::before {
  opacity: 0.1;
}

.control-button:active {
  transform: translateY(0);
}

.control-button.active-mode {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

/* ===============
   Playlist - Futuristisch
   =============== */
.playlist {
  list-style: none;
  margin: 12px 20px 15px;
  padding: 0;
  overflow: auto;
  max-height: 420px;
}

.playlist li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 15px;
  border-radius: 12px;
  color: var(--text-primary);
  cursor: pointer;
  border: 2px solid transparent;
  background: var(--bg-surface);
  margin-bottom: 8px;
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}


.playlist li:hover::before {
  opacity: 0.05;
}

.playlist li:hover .delete-track-btn {
  opacity: 1;
  visibility: visible;
}

.delete-track-btn:hover {
  background: rgba(255, 68, 68, 0.15);
  color: #ff4444;
  border-radius: 8px;
}

.playlist li.active {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  font-weight: 700;
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}

.playlist li.active .delete-track-btn {
  color: var(--text-inverse);
  opacity: 0.7;
}

.playlist li.active .delete-track-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  color: #ff6b6b;
  opacity: 1;
}

.playlist-count-badge {
  background: var(--gradient-primary);
  color: var(--text-inverse);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 20px;
  margin-left: 10px;
  min-width: 28px;
  text-align: center;
  box-shadow: 0 0 15px rgba(0, 212, 255, 0.4);
  animation: float 3s ease-in-out infinite;
}

/* ===============
   Info Tab - Futuristisch
   =============== */
.info-tab {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 12px;
  margin: 15px 20px 25px;
  padding: 15px 18px;
  border-radius: 15px;
  border: 2px solid var(--border-light);
  background: var(--bg-surface);
  color: var(--text-primary);
  box-shadow: var(--shadow-base);
  font-weight: 600;
  backdrop-filter: blur(10px);
}

.info-tab i {
  color: var(--primary);
  font-size: 1.1rem;
  animation: neon-glow 3s ease-in-out infinite;
}

.info-tab strong {
  font-weight: 800;
  color: var(--primary);
}

/* ===============
   Footer - Futuristisch
   =============== */
.footer {
  margin-top: 80px;
  padding: 40px 0;
  border-top: 2px solid var(--border-light);
  text-align: center;
  background: var(--bg-elevated);
  border-radius: 25px 25px 0 0;
  backdrop-filter: blur(20px);
  position: relative;
  overflow: hidden;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--gradient-primary);
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 25px;
  flex-wrap: wrap;
}

.footer-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  padding: 10px 15px;
  border-radius: 10px;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.footer-link::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.footer-link:hover {
  color: var(--primary);
  transform: translateY(-2px);
}

.footer-link:hover::before {
  opacity: 0.1;
}

.footer-text {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

/* ===============
   Hidden Content
   =============== */
.hidden {
  display: none !important;
}

/* ===============
   Responsive Design
   =============== */
@media (max-width: 768px) {
  .nav-tabs {
    flex-direction: column;
    gap: 6px;
    padding: 8px;
  }
  
  .nav-tab {
    justify-content: center;
    padding: 12px;
  }
  
  .footer-links {
    flex-direction: column;
    gap: 20px;
  }
  
  .app__header {
    text-align: center;
    padding: 15px 20px;
  }
  
  .header-actions {
    justify-content: center;
  }
  
  .audio-controls {
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
  }
  
  .volume-control {
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
  }
  
  .viz-controls {
    gap: 15px;
  }
  
  .content-section {
    padding: 20px;
    margin: 30px 0;
  }
  
  .content-section h2 {
    font-size: 1.6rem;
  }
  
  .progress-container {
    gap: 10px;
  }
  
  .timechip {
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .app {
    padding: 12px;
    gap: 20px;
  }
  
  .brand {
    gap: 10px;
  }
  
  .brand i {
    font-size: 1.6rem;
  }
  
  h1 {
    font-size: 1.4rem;
  }
  
  .panel__body {
    padding: 15px;
  }
  
  .audio-controls {
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 10px;
  }
  
  .control-button {
    padding: 12px 8px;
    font-size: 0.9rem;
  }
  
  .visualizer {
    width: min(400px, 85vw);
    margin: 15px 0 10px;
  }
  
  .content-section h2 {
    font-size: 1.4rem;
  }
  
  .footer-links {
    gap: 15px;
  }
}

/* ===============
   Accessibility & Focus States
   =============== */
:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px var(--border-glow);
  border-radius: 10px;
}

/* Verbesserte Kontraste für bessere Lesbarkeit */
html[data-theme="dark"] .faq-question,
html[data-theme="dark"] .content-section h3,
html[data-theme="dark"] .current-title {
  color: var(--text-primary);
}

html[data-theme="light"] .faq-question,
html[data-theme="light"] .content-section h3,
html[data-theme="light"] .current-title {
  color: var(--text-primary);
}

/* Improved text contrast for better readability */
html[data-theme="dark"] .content-section p,
html[data-theme="dark"] .content-section li,
html[data-theme="dark"] .faq-answer p {
  color: var(--text-secondary);
}

html[data-theme="light"] .content-section p,
html[data-theme="light"] .content-section li,
html[data-theme="light"] .faq-answer p {
  color: var(--text-secondary);
}

/* ===============
   Performance Optimizations
   =============== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* GPU Acceleration für smoother Animationen */
.panel,
.nav-tab,
.control-button,
.footer-link,
.uploader__label,
.icon-button {
  will-change: transform;
  transform: translateZ(0);
}

/* ===============
   Print Styles
   =============== */
@media print {
  .nav-tabs,
  .footer,
  .audio-controls,
  .visualizer,
  .volume-control {
    display: none !important;
  }
  
  .app {
    background: white !important;
    color: black !important;
  }
  
  .panel {
    border: 1px solid #ccc !important;
    box-shadow: none !important;
  }
} 

.playlist li::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.track-name {
  flex-grow: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  position: relative;
  z-index: 1;
}

.delete-track-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 6px 10px;
  border-radius: 8px;
  font-size: 0.9rem;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  flex-shrink: 0;
  position: relative;
  z-index: 1;
}

.playlist li:hover {
  border-color: var(--border-light);
  transform: translateX(3px);
}