:root {
  --primary: #8A2BE2;
  --primary-light: #9A3BF2;
  --primary-dark: #6A1B9A;
  --text: #ffffff;
  --text-secondary: #b0b0b0;
  --background: #0D0D0D;
  --surface: #1a1a1a;
  --surface-light: #2a2a2a;
  --surface-lighter: #3a3a3a;
  --accent: #BB86FC;
  --error: #CF6679;
  --success: #4CAF50;
  --border: rgba(138, 43, 226, 0.2);
  --border-hover: rgba(138, 43, 226, 0.4);
  --shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  --shadow-hover: 0 8px 30px rgba(138, 43, 226, 0.2);
}

* {
  box-sizing: border-box;
}

#reset-icon {
  position: fixed;
  top: 20px;
  left: 20px;
  font-size: 24px;
  cursor: pointer;
  z-index: 99999;
  color: var(--primary-light);
  transition: all 0.3s ease;
  background: rgba(138, 43, 226, 0.1);
  padding: 10px;
  border-radius: 50%;
  backdrop-filter: blur(10px);
}

#reset-icon:hover {
  color: var(--accent);
  transform: scale(1.1);
  background: rgba(138, 43, 226, 0.2);
}

body {
  font-family: 'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: linear-gradient(135deg, var(--background) 0%, #1a1a1a 50%, #0a0a0a 100%);
  color: var(--text);
  margin: 0;
  padding: 0;
  min-height: 100vh;
  line-height: 1.6;
  font-weight: 400;
}

.container {
  width: 100%;
  max-width: 1600px;
  margin: 0 auto;
  padding: 30px;
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.main-content {
  width: 100%;
  background: rgba(26, 26, 26, 0.8);
  border-radius: 24px;
  padding: 40px;
  border: 1px solid var(--border);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
}

h1 {
  color: var(--primary);
  text-align: center;
  font-size: 3rem;
  font-weight: 700;
  margin: 0 0 40px 0;
  text-shadow: 0 0 30px rgba(138, 43, 226, 0.3);
  letter-spacing: -0.02em;
}

.upload-section {
  text-align: center;
  margin-bottom: 40px;
  padding: 40px;
  background: rgba(138, 43, 226, 0.05);
  border-radius: 20px;
  border: 2px dashed var(--border);
  transition: all 0.3s ease;
}

.upload-section:hover {
  border-color: var(--border-hover);
  background: rgba(138, 43, 226, 0.08);
}

.file-upload-btn {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--text);
  padding: 20px 40px;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.3s ease;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
  font-size: 18px;
  border: none;
  box-shadow: var(--shadow);
  text-decoration: none;
}

.file-upload-btn:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent) 100%);
}

#waveform {
  width: 100%;
  height: 250px;
  background: var(--surface);
  border-radius: 20px;
  margin: 30px 0;
  border: 2px solid var(--border);
  box-shadow: inset 0 0 30px rgba(0, 0, 0, 0.5);
  position: relative;
}

#waveform:hover {
  border-color: var(--border-hover);
}

.audio-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 30px;
  padding: 20px 30px;
  background: rgba(138, 43, 226, 0.08);
  border-radius: 16px;
  font-weight: 600;
  color: var(--primary-light);
  font-size: 16px;
  border: 1px solid var(--border);
}

.controls {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 40px;
  flex-wrap: nowrap;
  padding: 20px;
  background: rgba(138, 43, 226, 0.03);
  border-radius: 20px;
  border: 1px solid var(--border);
  overflow-x: auto;
  flex-direction: row;
}

.effects-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
  margin: 40px 0;
}

.effect {
  background: linear-gradient(145deg, var(--surface) 0%, var(--surface-light) 100%);
  padding: 30px;
  border-radius: 20px;
  border: 1px solid var(--border);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.effect::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
}

.effect:hover {
  transform: translateY(-5px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-hover);
  background: linear-gradient(145deg, var(--surface-light) 0%, var(--surface-lighter) 100%);
}

.effect h3 {
  color: var(--primary-light);
  margin: 0 0 20px 0;
  font-size: 1.3rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.effect label {
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: 8px;
  display: block;
}

.effect-value {
  background: var(--primary);
  color: var(--background);
  padding: 8px 16px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 0.9rem;
  min-width: 60px;
  text-align: center;
  box-shadow: 0 2px 10px rgba(138, 43, 226, 0.3);
}

input[type="range"] {
  width: 100%;
  height: 12px;
  -webkit-appearance: none;
  background: var(--surface-light);
  outline: none;
  border-radius: 8px;
  overflow: hidden;
  margin: 20px 0 15px 0;
  cursor: pointer;
  border: 1px solid var(--border);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  cursor: pointer;
  border: 3px solid var(--background);
  box-shadow: -407px 0 0 400px var(--primary-light), 0 0 15px rgba(138, 43, 226, 0.4);
  transition: all 0.3s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
  box-shadow: -407px 0 0 400px var(--accent), 0 0 20px rgba(138, 43, 226, 0.6);
}

button {
  background: linear-gradient(135deg, var(--accent) 0%, var(--primary-light) 100%);
  color: var(--background);
  border: none;
  padding: 12px 20px;
  border-radius: 14px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-size: 15px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  box-shadow: var(--shadow);
  letter-spacing: 0.02em;
  white-space: nowrap;
  flex-shrink: 0;
}

button:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
}

button:active {
  transform: translateY(-1px);
}

button i {
  font-size: 16px;
}

#filename {
  background: rgba(138, 43, 226, 0.08);
  color: var(--text);
  border: 2px solid var(--border);
  padding: 20px;
  border-radius: 16px;
  margin: 30px 0;
  width: 100%;
  text-align: center;
  font-size: 1.2em;
  font-weight: 600;
  transition: all 0.3s ease;
  box-sizing: border-box;
}

#filename:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 20px rgba(138, 43, 226, 0.3);
  background: rgba(138, 43, 226, 0.12);
}

.settings-container {
  display: flex;
  gap: 20px;
  margin: 30px 0;
  align-items: center;
  padding: 25px;
  background: rgba(138, 43, 226, 0.05);
  border-radius: 20px;
  border: 1px solid var(--border);
}

#settings-dropdown {
  background: var(--surface);
  color: var(--text);
  border: 2px solid var(--border);
  padding: 16px 20px;
  border-radius: 14px;
  flex-grow: 1;
  font-size: 15px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-weight: 500;
}

#settings-dropdown:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 15px rgba(138, 43, 226, 0.2);
}

.process-btn {
  background: linear-gradient(135deg, var(--success) 0%, #66BB6A 100%);
  font-size: 18px;
  padding: 20px 40px;
  margin-top: 30px;
  width: 100%;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
  display: flex;
  border-radius: 16px;
  font-weight: 700;
}

.process-btn:hover {
  background: linear-gradient(135deg, #66BB6A 0%, var(--success) 100%);
}

#loudness-meter {
  background: linear-gradient(145deg, var(--surface) 0%, var(--surface-light) 100%);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 30px;
  text-align: center;
  margin-top: 30px;
  box-shadow: var(--shadow);
}

#loudness-meter h3 {
  color: var(--primary);
  margin: 0 0 20px 0;
  font-size: 1.4rem;
  font-weight: 600;
}

#loudness-bar {
  width: 100%;
  height: 30px;
  background: var(--surface-light);
  border-radius: 15px;
  overflow: hidden;
  border: 2px solid var(--border);
  position: relative;
}

#loudness-bar::before {
  content: '';
  display: block;
  height: 100%;
  width: var(--meter-value, 0%);
  background: linear-gradient(90deg, var(--success) 0%, var(--primary) 70%, var(--error) 100%);
  transition: width 0.1s ease;
  border-radius: 13px;
}

#loudness-value {
  display: block;
  margin-top: 15px;
  font-size: 1.2em;
  font-weight: 600;
  color: var(--primary-light);
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 20px;
    gap: 20px;
  }

  .main-content {
    padding: 25px 20px;
  }

  h1 {
    font-size: 2.5rem;
  }

  .effects-container {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .effect {
    padding: 20px 15px;
  }

  .effect h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
  }

  .controls {
    flex-direction: row !important;
    justify-content: center;
    gap: 10px;
    flex-wrap: nowrap !important;
    padding: 15px;
    overflow-x: auto;
  }

  /* Mobile buttons - icon only, circular */
  .controls button {
    padding: 14px !important;
    font-size: 16px;
    min-width: 50px !important;
    min-height: 50px !important;
    border-radius: 50% !important;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    gap: 0 !important;
  }

  /* Hide ALL text on mobile, keep only icons */
  .controls button {
    font-size: 0 !important;
    line-height: 0 !important;
  }

  .controls button * {
    display: none !important;
  }

  .controls button i {
    display: block !important;
    margin: 0 !important;
    font-size: 18px !important;
    line-height: normal !important;
  }

  .controls button span,
  .controls button .btn-text {
    display: none !important;
    visibility: hidden !important;
    font-size: 0 !important;
  }

  .controls button::before,
  .controls button::after {
    display: none !important;
    content: none !important;
  }

  .file-upload-btn {
    border-radius: 14px;
    padding: 16px 24px;
    width: 100%;
    margin-bottom: 20px;
  }

  .file-upload-btn span {
    display: inline;
  }

  .process-btn {
    border-radius: 14px;
    padding: 16px 24px;
    width: 100%;
  }

  .process-btn span {
    display: inline;
  }

  .settings-container {
    flex-direction: column;
    gap: 15px;
    padding: 20px;
  }

  #settings-dropdown {
    width: 100%;
  }

  input[type="range"]::-webkit-slider-thumb {
    width: 28px;
    height: 28px;
    border: 2px solid var(--background);
  }

  .effect-value {
    font-size: 0.85rem;
    padding: 6px 12px;
    min-width: 50px;
  }

  #filename {
    padding: 16px;
    font-size: 1.1rem;
    margin: 20px 0;
  }

  .audio-info {
    padding: 15px 20px;
    font-size: 15px;
    margin-bottom: 20px;
  }

  .upload-section {
    padding: 25px;
    margin-bottom: 25px;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: 20px 15px;
  }

  h1 {
    font-size: 2rem;
    margin-bottom: 30px;
  }

  .file-upload-btn {
    padding: 14px 20px;
    font-size: 16px;
  }

  .effects-container {
    grid-template-columns: 1fr;
    gap: 15px;
  }

  .effect {
    padding: 20px 15px;
  }

  .effect h3 {
    font-size: 1rem;
    margin-bottom: 12px;
  }

  .controls {
    gap: 8px;
    padding: 12px;
    flex-wrap: nowrap !important;
    flex-direction: row !important;
    overflow-x: auto;
  }

  .controls button {
    padding: 12px !important;
    min-width: 44px !important;
    min-height: 44px !important;
    flex-shrink: 0;
    border-radius: 50% !important;
    gap: 0 !important;
  }

  .controls button {
    font-size: 0 !important;
    line-height: 0 !important;
  }

  .controls button * {
    display: none !important;
  }

  .controls button i {
    display: block !important;
    font-size: 16px !important;
    margin: 0 !important;
    line-height: normal !important;
  }

  .controls button span,
  .controls button .btn-text {
    display: none !important;
    visibility: hidden !important;
    font-size: 0 !important;
  }

  .controls button::before,
  .controls button::after {
    display: none !important;
    content: none !important;
  }

  .process-btn {
    padding: 16px 20px;
    font-size: 16px;
  }

  .audio-info {
    padding: 12px 16px;
    font-size: 14px;
  }

  #filename {
    padding: 14px;
    font-size: 1rem;
  }

  input[type="range"]::-webkit-slider-thumb {
    width: 26px;
    height: 26px;
  }

  .effect-value {
    font-size: 0.8rem;
    min-width: 45px;
  }

  .upload-section {
    padding: 20px;
  }
}

/* Media query for larger screens - side loudness meter */
@media (min-width: 1400px) {
  body {
    padding-right: 140px;
  }

  .container {
    position: relative;
  }

  #loudness-meter {
    position: fixed;
    top: 0;
    right: 20px;
    width: 100px;
    height: 100vh;
    margin: 0;
    padding: 30px 15px;
    background: rgba(26, 26, 26, 0.9);
    backdrop-filter: blur(20px);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    align-items: center;
    border-left: 2px solid var(--border);
    box-shadow: -10px 0 30px rgba(0, 0, 0, 0.3);
  }

  #loudness-bar {
    height: calc(100% - 140px);
    width: 30px;
    margin: 20px 0;
  }

  #loudness-bar::before {
    width: 100%;
    height: var(--meter-value, 0%);
    transition: height 0.1s ease;
  }

  #loudness-value {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    margin-top: 0;
    font-size: 1rem;
  }

  #loudness-meter h3 {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    font-size: 1.1rem;
  }
}

/* Enhanced scrollbar styling */
::-webkit-scrollbar {
  width: 10px;
}

::-webkit-scrollbar-track {
  background: var(--surface);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--primary) 0%, var(--accent) 100%);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--accent) 0%, var(--primary-light) 100%);
}

/* Focus styles for accessibility */
button:focus,
input:focus,
select:focus {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Animation for loading states */
@keyframes pulse {
  0% { opacity: 1; }
  50% { opacity: 0.7; }
  100% { opacity: 1; }
}

.loading {
  animation: pulse 1.5s ease-in-out infinite;
}

/* Enhanced button states */
button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

button:disabled:hover {
  transform: none;
  box-shadow: var(--shadow);
}

/* Professional typography improvements */
.effect h3::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 30px;
  height: 2px;
  background: var(--primary);
  border-radius: 1px;
}

/* Smooth transitions for all interactive elements */
* {
  transition: color 0.3s ease, background-color 0.3s ease, border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
}