/* ============================================
   Audio-Plattform – Design System
   ============================================ */

/* --- Google Font --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* --- Design Tokens --- */
:root {
  /* Farben */
  --bg-main: #121016;
  --bg-section: #1E132A;
  --bg-card: #2C1A3D;
  --bg-card-hover: #362248;
  --accent: #441678;
  --accent-hover: #6E44A3;
  --accent-glow: rgba(68, 22, 120, 0.4);
  --text-primary: #F2F2F2;
  --text-secondary: #B8B8C2;
  --text-muted: #7A7A88;
  --border-subtle: rgba(138, 92, 214, 0.15);
  --border-card: rgba(138, 92, 214, 0.1);
  --overlay: rgba(18, 16, 22, 0.85);
  --success: #4ADE80;
  --error: #F87171;
  --warning: #FBBF24;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-xs: 0.75rem;
  --font-sm: 0.875rem;
  --font-base: 1rem;
  --font-lg: 1.125rem;
  --font-xl: 1.25rem;
  --font-2xl: 1.5rem;
  --font-3xl: 2rem;
  --font-4xl: 2.5rem;
  --font-5xl: 3.25rem;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 24px var(--accent-glow);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-smooth: 500ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-base);
  font-weight: 400;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-main);
  min-height: 100vh;
  overflow-x: hidden;
}

a {
  color: var(--accent-hover);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--text-primary);
}

img {
  max-width: 100%;
  display: block;
}

button {
  font-family: var(--font-family);
  cursor: pointer;
  border: none;
  outline: none;
}

input {
  font-family: var(--font-family);
}

/* --- Utility Classes --- */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* --- Background Ambient Glow --- */
.ambient-glow {
  position: fixed;
  top: -200px;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(110, 68, 163, 0.08) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-md) 0;
  background: rgba(18, 16, 22, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: background var(--transition-base);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: var(--font-lg);
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.nav-logo span {
  color: var(--accent);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
}

.nav-links a {
  font-size: var(--font-sm);
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.nav-links a:hover {
  color: var(--text-primary);
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  font-size: var(--font-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  letter-spacing: 0.01em;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: var(--text-primary);
  box-shadow: var(--shadow-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 32px var(--accent-glow), var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  border-color: var(--accent);
  background: rgba(110, 68, 163, 0.1);
}

.btn-sm {
  padding: 0.5rem 1.25rem;
  font-size: var(--font-xs);
}

.btn-lg {
  padding: 1rem 2.5rem;
  font-size: var(--font-base);
}

/* --- Hero Section --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-4xl) var(--space-lg);
  position: relative;
}

.hero-content {
  max-width: 680px;
  position: relative;
  z-index: 1;
}

.hero-badge {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: rgba(110, 68, 163, 0.15);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: var(--font-xs);
  font-weight: 500;
  color: var(--accent-hover);
  margin-bottom: var(--space-xl);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.hero h1 {
  font-size: var(--font-4xl);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-lg);
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: var(--font-lg);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-2xl);
  font-weight: 300;
}

/* --- Sections --- */
.section {
  padding: var(--space-4xl) 0;
  position: relative;
}

.section-alt {
  background: var(--bg-section);
}

.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto var(--space-3xl);
}

.section-header h2 {
  font-size: var(--font-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
  color: var(--text-primary);
}

.section-header p {
  font-size: var(--font-lg);
  color: var(--text-secondary);
  line-height: 1.7;
  font-weight: 300;
}

/* --- Feature Cards --- */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-subtle);
  box-shadow: var(--shadow-lg);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(110, 68, 163, 0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  font-size: var(--font-xl);
}

.feature-card h3 {
  font-size: var(--font-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.feature-card p {
  font-size: var(--font-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Audio Preview (Landing) --- */
.audio-preview {
  max-width: 500px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
}

.audio-preview-label {
  font-size: var(--font-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-md);
}

.audio-preview audio {
  width: 100%;
  border-radius: var(--radius-md);
  outline: none;
}

/* Style the native audio player for dark theme */
.audio-preview audio::-webkit-media-controls-panel {
  background: var(--bg-section);
}

/* --- Pricing Section --- */
.pricing-content {
  max-width: 560px;
  margin: 0 auto;
  text-align: center;
}

.pricing-content > p {
  font-size: var(--font-lg);
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-xl);
  font-weight: 300;
}

.pricing-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  margin-bottom: var(--space-2xl);
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition-base);
}

.pricing-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}

.pricing-card.featured {
  border-color: var(--accent);
  position: relative;
}

.pricing-card.featured::after {
  content: 'Empfohlen';
  position: absolute;
  top: -10px;
  left: 50%;
  transform: translateX(-50%);
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: var(--text-primary);
  font-size: var(--font-xs);
  font-weight: 600;
  padding: 0.2rem 0.8rem;
  border-radius: var(--radius-full);
  letter-spacing: 0.03em;
}

.pricing-amount {
  font-size: var(--font-3xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.pricing-amount span {
  font-size: var(--font-sm);
  font-weight: 400;
  color: var(--text-secondary);
}

.pricing-period {
  font-size: var(--font-sm);
  color: var(--text-muted);
}

.pricing-note {
  font-size: var(--font-sm);
  color: var(--text-secondary);
  font-style: italic;
  margin-top: var(--space-md);
}

/* --- Footer --- */
.footer {
  padding: var(--space-2xl) 0;
  border-top: 1px solid var(--border-subtle);
  text-align: center;
}

.footer p {
  font-size: var(--font-sm);
  color: var(--text-muted);
}

/* ============================================
   Auth Page Styles
   ============================================ */

.auth-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
}

.auth-container {
  width: 100%;
  max-width: 420px;
}

.auth-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.auth-header h1 {
  font-size: var(--font-2xl);
  font-weight: 700;
  margin-bottom: var(--space-sm);
}

.auth-header p {
  color: var(--text-secondary);
  font-size: var(--font-sm);
}

.auth-tabs {
  display: flex;
  background: var(--bg-section);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: var(--space-xl);
  border: 1px solid var(--border-card);
}

.auth-tab {
  flex: 1;
  padding: 0.6rem;
  font-size: var(--font-sm);
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  text-align: center;
}

.auth-tab.active {
  background: var(--bg-card);
  color: var(--text-primary);
  box-shadow: var(--shadow-sm);
}

.auth-tab:hover:not(.active) {
  color: var(--text-primary);
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.form-group label {
  font-size: var(--font-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input {
  padding: 0.75rem 1rem;
  background: var(--bg-section);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: var(--font-base);
  transition: all var(--transition-fast);
  outline: none;
}

.form-group input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group input::placeholder {
  color: var(--text-muted);
}

.auth-error {
  display: none;
  padding: 0.75rem 1rem;
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.3);
  border-radius: var(--radius-md);
  color: var(--error);
  font-size: var(--font-sm);
  text-align: center;
}

.auth-error.visible {
  display: block;
}

.auth-success {
  display: none;
  padding: 0.75rem 1rem;
  background: rgba(74, 222, 128, 0.1);
  border: 1px solid rgba(74, 222, 128, 0.3);
  border-radius: var(--radius-md);
  color: var(--success);
  font-size: var(--font-sm);
  text-align: center;
}

.auth-success.visible {
  display: block;
}

.auth-form .btn {
  margin-top: var(--space-sm);
  width: 100%;
}

.auth-footer {
  text-align: center;
  margin-top: var(--space-xl);
}

.auth-footer a {
  font-size: var(--font-sm);
  color: var(--text-secondary);
}

/* ============================================
   Dashboard Styles
   ============================================ */

.dashboard {
  min-height: 100vh;
  padding-top: 80px;
}

.dashboard-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-md) 0;
  background: rgba(18, 16, 22, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
}

.dashboard-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.dashboard-greeting {
  font-size: var(--font-sm);
  color: var(--text-secondary);
}

.dashboard-greeting strong {
  color: var(--text-primary);
  font-weight: 600;
}

.btn-logout {
  padding: 0.4rem 1rem;
  font-size: var(--font-xs);
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border-card);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.btn-logout:hover {
  color: var(--text-primary);
  border-color: var(--accent);
}

/* Dashboard Header */
.dashboard-header {
  text-align: center;
  padding: var(--space-3xl) 0 var(--space-2xl);
}

.dashboard-header h1 {
  font-size: var(--font-3xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.dashboard-header p {
  color: var(--text-secondary);
  font-size: var(--font-lg);
  font-weight: 300;
}

/* Audio Cards Grid */
.audio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
  padding-bottom: var(--space-3xl);
}

/* Audio Card */
.audio-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition-smooth);
  position: relative;
  overflow: hidden;
}

.audio-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity var(--transition-base);
}

.audio-card:hover {
  border-color: var(--border-subtle);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.audio-card:hover::before {
  opacity: 1;
}

.audio-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-md);
}

.audio-card-info h3 {
  font-size: var(--font-lg);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.audio-card-info .audio-duration {
  font-size: var(--font-xs);
  color: var(--text-muted);
  font-weight: 500;
  background: rgba(110, 68, 163, 0.15);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  display: inline-block;
}

.audio-card-description {
  font-size: var(--font-sm);
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-lg);
}

/* Stats Button */
.stats-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  background: rgba(110, 68, 163, 0.1);
  border: 1px solid var(--border-card);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  flex-shrink: 0;
  cursor: pointer;
}

.stats-btn:hover {
  background: rgba(110, 68, 163, 0.25);
  color: var(--accent-hover);
  border-color: var(--accent);
}

.stats-btn svg {
  width: 18px;
  height: 18px;
}

/* Stats Popup */
.stats-popup {
  display: none;
  background: var(--bg-section);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
  animation: fadeSlideIn 0.3s ease;
}

.stats-popup.visible {
  display: block;
}

.stats-popup h4 {
  font-size: var(--font-xs);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-sm);
}

.stats-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.stat-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: var(--font-sm);
}

.stat-item .stat-label {
  color: var(--text-secondary);
}

.stat-item .stat-value {
  font-weight: 600;
  color: var(--accent-hover);
}



/* Play Button */
.play-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 1.75rem;
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  font-size: var(--font-sm);
  font-weight: 600;
  transition: all var(--transition-base);
}

.play-btn:hover {
  border-color: var(--accent);
  background: rgba(68, 22, 120, 0.1);
}

.play-btn:active {
  transform: translateY(0);
}

.play-btn svg {
  width: 18px;
  height: 18px;
  transition: transform var(--transition-fast);
}

.play-btn.playing svg {
  transform: scale(1.1);
}

/* Audio Progress Bar */
.audio-progress {
  width: 100%;
  height: 4px;
  background: rgba(110, 68, 163, 0.2);
  border-radius: var(--radius-full);
  margin-top: var(--space-sm);
  overflow: hidden;
  cursor: pointer;
  display: none;
}

.audio-progress.visible {
  display: block;
}

.audio-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-hover));
  border-radius: var(--radius-full);
  width: 0%;
  transition: width 0.1s linear;
}

.audio-time {
  display: none;
  justify-content: space-between;
  font-size: var(--font-xs);
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

.audio-time.visible {
  display: flex;
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeSlideIn {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

/* Scroll Reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Hero Animation */
.hero-content {
  animation: slideUp 1s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* Loading Spinner */
.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border-subtle);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Loading Overlay */
.loading-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-main);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  transition: opacity var(--transition-slow);
}

.loading-overlay.hidden {
  opacity: 0;
  pointer-events: none;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 768px) {
  :root {
    --font-4xl: 2rem;
    --font-3xl: 1.625rem;
    --font-2xl: 1.25rem;
    --space-4xl: 3.5rem;
    --space-3xl: 2.5rem;
  }

  .container {
    padding: 0 var(--space-md);
  }

  .nav-links {
    gap: var(--space-md);
  }

  .hero {
    padding: var(--space-3xl) var(--space-md);
    min-height: auto;
    padding-top: 120px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .audio-grid {
    grid-template-columns: 1fr;
  }

  .pricing-cards {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: var(--font-3xl);
  }

  .dashboard-header h1 {
    font-size: var(--font-2xl);
  }
}

@media (max-width: 480px) {
  .nav-links a:not(.btn) {
    display: none;
  }

  .hero p {
    font-size: var(--font-base);
  }

  .section-header h2 {
    font-size: var(--font-2xl);
  }

  .btn-lg {
    padding: 0.85rem 2rem;
    font-size: var(--font-sm);
  }
}

/* ============================================
   Scrollbar Styling
   ============================================ */

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-main);
}

::-webkit-scrollbar-thumb {
  background: var(--bg-card);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--accent);
}

/* ============================================
   Selection Color
   ============================================ */

::selection {
  background: var(--accent);
  color: var(--text-primary);
}