/**
 * main.css
 * Harmonix Lab Design System: Dark Futuristic Studio Aesthetic with Glassmorphism
 */

:root {
  --bg-primary: #07090e;
  --bg-secondary: #0d121d;
  --bg-surface: rgba(15, 23, 42, 0.75);
  --bg-surface-hover: rgba(30, 41, 59, 0.85);
  
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(0, 242, 254, 0.5);
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --accent-cyan: #00f2fe;
  --accent-violet: #8b5cf6;
  --accent-amber: #f59e0b;
  --accent-emerald: #10b981;
  --accent-rose: #f43f5e;
  --accent-blue: #38bdf8;
  
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", Menlo, Monaco, Consolas, monospace;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 18px;
  --radius-full: 9999px;

  --shadow-glow-cyan: 0 0 20px rgba(0, 242, 254, 0.25);
  --shadow-glow-violet: 0 0 20px rgba(139, 92, 246, 0.25);
  --shadow-glow-amber: 0 0 20px rgba(245, 158, 11, 0.25);
}

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

body {
  background-color: var(--bg-primary);
  background-image: 
    radial-gradient(at 0% 0%, rgba(0, 242, 254, 0.06) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.06) 0px, transparent 50%);
  background-attachment: fixed;
  color: var(--text-main);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Audio Unlock Banner */
.audio-banner {
  background: linear-gradient(90deg, rgba(0, 242, 254, 0.15), rgba(139, 92, 246, 0.15));
  border-bottom: 1px solid var(--accent-cyan);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.audio-banner.hidden {
  display: none;
}

.banner-content {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.95rem;
}

/* Header & Global Transport */
.app-header {
  background: rgba(13, 18, 29, 0.85);
  border-bottom: 1px solid var(--border-subtle);
  padding: 0.75rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  backdrop-filter: blur(16px);
  position: sticky;
  top: 0;
  z-index: 90;
}

.logo-area {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-icon {
  font-size: 1.8rem;
  filter: drop-shadow(0 0 8px var(--accent-cyan));
}

.brand-title {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #ffffff 30%, var(--accent-cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* Navigation Tabs */
.nav-tabs {
  display: flex;
  align-items: center;
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-full);
  padding: 0.25rem;
  gap: 0.25rem;
}

.nav-tab-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.5rem 1.1rem;
  font-size: 0.875rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
}

.nav-tab-btn:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.04);
}

.nav-tab-btn.active {
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.2), rgba(139, 92, 246, 0.2));
  color: var(--accent-cyan);
  border: 1px solid rgba(0, 242, 254, 0.4);
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.2);
}

/* Header Transport & HUD */
.header-hud {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.hud-oscilloscope {
  display: flex;
  align-items: center;
  background: rgba(0, 0, 0, 0.4);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 2px 8px;
}

.hud-audio-status {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.75rem;
  font-family: var(--font-mono);
  color: var(--text-muted);
}

.status-led {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #64748b;
}

.status-led.active {
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
}

.volume-control {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
}

.volume-slider {
  width: 70px;
  accent-color: var(--accent-cyan);
}

.lang-select {
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-full);
  color: var(--text-main);
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 500;
  font-family: inherit;
  cursor: pointer;
  outline: none;
  transition: all var(--transition-fast);
}

.lang-select:hover, .lang-select:focus {
  border-color: var(--accent-cyan);
  box-shadow: 0 0 10px rgba(56, 189, 248, 0.25);
}

.lang-select option {
  background: #0f172a;
  color: #f8fafc;
  padding: 0.25rem;
}

/* Main Container */
.app-main {
  flex: 1;
  max-width: 1440px;
  width: 100%;
  margin: 0 auto;
  padding: 2rem;
}

.tab-section {
  display: none;
  animation: fadeIn 0.3s ease forwards;
}

.tab-section.active {
  display: block;
}

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

/* Tab Hero Banners */
.tab-hero {
  margin-bottom: 2rem;
}

.tab-hero h2 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.tab-hero p {
  color: var(--text-muted);
  font-size: 1.05rem;
  max-width: 800px;
}

/* Panels & Glassmorphism */
.lab-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(480px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.panel {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  backdrop-filter: blur(16px);
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.panel:hover {
  border-color: rgba(255, 255, 255, 0.14);
}

.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.85rem;
}

.panel-header h3 {
  font-size: 1.2rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.panel-desc {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 1.25rem;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.badge-success {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-emerald);
  border-color: rgba(16, 185, 129, 0.3);
}

.badge-warning {
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.3);
}

.badge-danger {
  background: rgba(244, 63, 94, 0.15);
  color: var(--accent-rose);
  border-color: rgba(244, 63, 94, 0.3);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: inherit;
}

.btn-primary {
  background: linear-gradient(135deg, #00f2fe, #0284c7);
  color: #040812;
  box-shadow: 0 4px 14px rgba(0, 242, 254, 0.3);
}

.btn-primary:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0, 242, 254, 0.4);
}

.btn-accent {
  background: linear-gradient(135deg, #8b5cf6, #6366f1);
  color: #ffffff;
  box-shadow: 0 4px 14px rgba(139, 92, 246, 0.3);
}

.btn-accent:hover {
  filter: brightness(1.1);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

.btn-danger {
  background: linear-gradient(135deg, #f43f5e, #e11d48);
  color: #ffffff;
}

.btn-pill {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--border-subtle);
  color: var(--text-muted);
  border-radius: var(--radius-full);
}

.btn-pill:hover {
  color: var(--text-main);
  background: rgba(255, 255, 255, 0.1);
}

.btn-pill.active {
  background: rgba(0, 242, 254, 0.15);
  color: var(--accent-cyan);
  border-color: rgba(0, 242, 254, 0.4);
}

.btn-sm {
  padding: 0.35rem 0.75rem;
  font-size: 0.8rem;
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1.05rem;
}

/* Sliders & Inputs */
.slider-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 0.85rem;
}

.slider-group label {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
  color: var(--text-muted);
}

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--accent-cyan);
  cursor: pointer;
  box-shadow: 0 0 8px var(--accent-cyan);
  transition: transform 0.1s ease;
}

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

.select-input {
  background: rgba(15, 23, 42, 0.8);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  padding: 0.5rem 0.85rem;
  font-size: 0.9rem;
  outline: none;
  font-family: inherit;
}

.select-input:focus {
  border-color: var(--accent-cyan);
}

/* Utilities */
.mono-value {
  font-family: var(--font-mono);
  font-weight: 600;
}

.highlight-cyan { color: var(--accent-cyan); }
.highlight-violet { color: var(--accent-violet); }
.highlight-amber { color: var(--accent-amber); }
.highlight-emerald { color: var(--accent-emerald); }

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.controls-row {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.align-center { align-items: center; }
.flex-wrap { flex-wrap: wrap; }

.alerts-box, .alert {
  padding: 0.85rem 1.15rem;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  line-height: 1.5;
  margin-top: 1rem;
}

.alert-info {
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid rgba(56, 189, 248, 0.25);
  color: #bae6fd;
}

.alert-success {
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  color: #a7f3d0;
}

.alert-warning {
  background: rgba(245, 158, 11, 0.1);
  border: 1px solid rgba(245, 158, 11, 0.25);
  color: #fde68a;
}

.alert-danger {
  background: rgba(244, 63, 94, 0.1);
  border: 1px solid rgba(244, 63, 94, 0.25);
  color: #fecdd3;
}

.theory-callout {
  background: rgba(13, 18, 29, 0.7);
  border-left: 3px solid var(--accent-cyan);
  padding: 1rem;
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  margin-top: 1.25rem;
  font-size: 0.88rem;
}

.theory-callout h4 {
  color: var(--accent-cyan);
  margin-bottom: 0.35rem;
  font-size: 0.95rem;
}

/* Modal */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(4, 7, 13, 0.8);
  backdrop-filter: blur(12px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-overlay.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  max-width: 680px;
  width: 100%;
  padding: 2rem;
  position: relative;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.25rem;
}

.btn-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
}