@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&family=JetBrains+Mono:wght@400;700&display=swap');

:root {
  --bg-dark: #05010a;
  --bg-card: rgba(20, 10, 35, 0.65);
  --bg-input: rgba(10, 5, 20, 0.8);
  --border-neon: rgba(0, 255, 102, 0.15);
  --border-neon-active: rgba(0, 255, 102, 0.6);
  
  --neon-green: #00ff66;
  --neon-pink: #ff007f;
  --neon-cyan: #00f0ff;
  --text-main: #f5f0ff;
  --text-mute: #8e7ea5;
  
  --glow-green: 0 0 15px rgba(0, 255, 102, 0.4);
  --glow-pink: 0 0 15px rgba(255, 0, 127, 0.4);
  --glow-cyan: 0 0 15px rgba(0, 240, 255, 0.4);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  background: radial-gradient(circle at 50% 0%, #1a082e 0%, var(--bg-dark) 80%);
  color: var(--text-main);
  font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 40px 20px;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

/* Header & Branding */
header {
  text-align: center;
  margin-bottom: 8px;
}

.logo-container {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
}

.logo-icon {
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, var(--neon-cyan), var(--neon-green));
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  color: var(--bg-dark);
  font-size: 18px;
  box-shadow: var(--glow-green);
}

h1 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(to right, #ffffff, #d3c4ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.logo-sub {
  font-size: 14px;
  color: var(--neon-cyan);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-top: 4px;
  text-shadow: 0 0 8px rgba(0, 240, 255, 0.3);
}

/* Navigation Tabs */
.tabs {
  display: flex;
  background: var(--bg-card);
  padding: 6px;
  border-radius: 14px;
  border: 1px solid var(--border-neon);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.tab-btn {
  flex: 1;
  padding: 12px 16px;
  background: transparent;
  border: none;
  color: var(--text-mute);
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  border-radius: 10px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.tab-btn:hover {
  color: var(--text-main);
}

.tab-btn[data-active="true"] {
  background: linear-gradient(135deg, rgba(0, 255, 102, 0.15), rgba(0, 240, 255, 0.15));
  color: var(--neon-green);
  border: 1px solid rgba(0, 255, 102, 0.3);
  text-shadow: 0 0 10px rgba(0, 255, 102, 0.2);
}

/* Cards & Panels */
.panel {
  display: none;
  animation: fadeIn 0.4s ease;
}

.panel[data-show="true"] {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-neon);
  border-radius: 20px;
  padding: 24px;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
  transition: border-color 0.3s ease;
}

.card:focus-within {
  border-color: var(--border-neon-active);
}

/* Phone Screen (Receiver) */
.code-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: var(--bg-input);
  border-radius: 16px;
  border: 1px dashed rgba(0, 255, 102, 0.3);
  margin-bottom: 8px;
  position: relative;
  overflow: hidden;
}

.code-display::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; height: 1px;
  background: linear-gradient(90deg, transparent, var(--neon-green), transparent);
  animation: scan 2s linear infinite;
}

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

.code-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-mute);
  margin-bottom: 8px;
}

.code-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 54px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--neon-green);
  text-shadow: 0 0 15px rgba(0, 255, 102, 0.5);
  margin-left: 0.1em; /* balancing letter spacing */
}

/* Copy share URL button */
.copy-link-btn {
  background: transparent;
  border: none;
  color: var(--neon-cyan);
  font-size: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 10px;
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid rgba(0, 240, 255, 0.2);
  transition: all 0.2s;
}
.copy-link-btn:hover {
  background: rgba(0, 240, 255, 0.1);
  border-color: var(--neon-cyan);
}

/* Visualizer Container */
.visualizer-wrapper {
  position: relative;
  width: 100%;
  height: 180px;
  background: #000;
  border-radius: 16px;
  border: 1px solid var(--border-neon);
  overflow: hidden;
  box-shadow: inset 0 0 20px rgba(0,0,0,0.8);
}

canvas {
  width: 100%;
  height: 100%;
  display: block;
}

/* Equalizer Panel */
.eq-container {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 8px;
}

.eq-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 14px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-main);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.eq-row {
  display: flex;
  align-items: center;
  gap: 16px;
}

.eq-knob-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: rgba(0,0,0,0.2);
  padding: 16px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.eq-slider-group {
  flex: 2;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.slider-container {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.slider-header {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-mute);
}

.slider-header span.val {
  color: var(--text-main);
  font-family: 'JetBrains Mono', monospace;
}

.slider-header span.val.boosted {
  color: var(--neon-pink);
  text-shadow: 0 0 5px rgba(255, 0, 127, 0.3);
}

/* Range Inputs */
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  outline: none;
  transition: background 0.3s;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--text-main);
  cursor: pointer;
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
  transition: transform 0.1s, background-color 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

/* Custom coloring for Bass Booster */
#bassSlider::-webkit-slider-thumb {
  background: var(--neon-pink);
  box-shadow: var(--glow-pink);
}

#midSlider::-webkit-slider-thumb {
  background: var(--neon-cyan);
  box-shadow: var(--glow-cyan);
}

#trebleSlider::-webkit-slider-thumb {
  background: var(--neon-green);
  box-shadow: var(--glow-green);
}

/* Laptop Screen (Sender) */
.input-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 8px;
}

label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-mute);
  font-weight: 600;
}

.code-input-wrapper {
  display: flex;
  border: 1px solid var(--border-neon);
  background: var(--bg-input);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.3s;
}

.code-input-wrapper:focus-within {
  border-color: var(--neon-cyan);
  box-shadow: 0 0 15px rgba(0, 240, 255, 0.15);
}

.code-input-wrapper input {
  flex: 1;
  background: transparent;
  border: none;
  padding: 16px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 28px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: 0.25em;
  text-align: center;
  outline: none;
}

.code-input-wrapper input::placeholder {
  color: rgba(255, 255, 255, 0.15);
  letter-spacing: normal;
}

/* Buttons */
.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 16px;
  border-radius: 12px;
  border: none;
  font-family: 'Space Grotesk', sans-serif;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
  box-shadow: none !important;
}

.btn-primary {
  background: linear-gradient(135deg, var(--neon-cyan) 0%, var(--neon-green) 100%);
  color: var(--bg-dark);
  box-shadow: var(--glow-green);
}

.btn-primary:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 0 22px rgba(0, 255, 102, 0.6);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-danger {
  background: linear-gradient(135deg, #ff0055 0%, var(--neon-pink) 100%);
  color: white;
  box-shadow: var(--glow-pink);
}

.btn-danger:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 0 22px rgba(255, 0, 85, 0.6);
}

.btn-secondary {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-main);
}

.btn-secondary:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.05);
  border-color: rgba(255, 255, 255, 0.3);
}

/* Sound check section */
.soundcheck-box {
  margin-top: 16px;
  border-top: 1px dashed rgba(255,255,255,0.1);
  padding-top: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* Status Indicator */
.status-box {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-mute);
  min-height: 24px;
  padding: 8px 12px;
  border-radius: 8px;
  background: rgba(0,0,0,0.15);
  border-left: 3px solid rgba(255,255,255,0.2);
  transition: all 0.3s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-mute);
}

.status-box[data-tone="ok"] {
  border-left-color: var(--neon-green);
  color: var(--text-main);
}
.status-box[data-tone="ok"] .status-indicator {
  background: var(--neon-green);
  box-shadow: var(--glow-green);
  animation: pulse 1.5s infinite alternate;
}

.status-box[data-tone="err"] {
  border-left-color: var(--neon-pink);
  color: #ffb3d1;
}
.status-box[data-tone="err"] .status-indicator {
  background: var(--neon-pink);
  box-shadow: var(--glow-pink);
}

@keyframes pulse {
  0% { opacity: 0.4; }
  100% { opacity: 1; }
}

/* Tips & Guides */
.guide-box {
  border-left: 2px solid rgba(0, 240, 255, 0.3);
  padding-left: 12px;
  margin-top: 10px;
}

.guide-box h4 {
  font-size: 13px;
  color: var(--neon-cyan);
  margin-bottom: 4px;
  font-family: 'Space Grotesk', sans-serif;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.guide-box p {
  font-size: 12px;
  color: var(--text-mute);
  line-height: 1.6;
}

.guide-box p b {
  color: var(--text-main);
}

/* Overlay Gate */
.unlock-overlay {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 50% 50%, #17072d 0%, #030006 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 32px;
  z-index: 100;
  padding: 40px;
  text-align: center;
  animation: fadeIn 0.5s ease;
}

.unlock-overlay h2 {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 24px;
  color: var(--text-main);
}

.unlock-overlay p {
  color: var(--text-mute);
  font-size: 14px;
  max-width: 280px;
  line-height: 1.5;
}

.unlock-btn-pulse {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.unlock-btn-pulse::after {
  content: '';
  position: absolute;
  width: 90px;
  height: 90px;
  border-radius: 50%;
  border: 2px solid var(--neon-green);
  animation: ripple 2s infinite;
  opacity: 0.8;
}

.unlock-overlay button {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--neon-green), var(--neon-cyan));
  color: var(--bg-dark);
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
  z-index: 2;
  box-shadow: var(--glow-green);
  transition: all 0.3s;
}

.unlock-overlay button:hover {
  transform: scale(1.1);
  box-shadow: 0 0 30px rgba(0, 255, 102, 0.8);
}

@keyframes ripple {
  0% { transform: scale(1); opacity: 0.8; }
  100% { transform: scale(1.6); opacity: 0; }
}

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

/* Responsive fixes */
@media (max-width: 480px) {
  body {
    padding: 20px 12px;
  }
  .card {
    padding: 18px;
  }
  .code-value {
    font-size: 44px;
  }
}

/* Active state classes for mode selector */
.btn-mode {
  flex: 1;
  padding: 10px;
  font-size: 11px;
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-radius: 10px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  display: inline-block;
  text-align: center;
  border: 1px solid rgba(255, 255, 255, 0.1);
  outline: none;
}
.btn-mode[data-active="true"] {
  background: linear-gradient(135deg, var(--neon-cyan) 0%, #00bcff 100%);
  color: #000;
  box-shadow: var(--glow-cyan);
  border-color: var(--neon-cyan);
}
.btn-mode[data-active="false"] {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-mute);
  border-color: rgba(255, 255, 255, 0.08);
}
.btn-mode[data-active="false"]:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.2);
}