/* ==========================================================================
   Parametric Math Flower - Modern Dark Luxury Stylesheet
   ========================================================================== */

:root {
  --bg-color: #020205;
  --panel-bg: rgba(15, 10, 25, 0.75);
  --panel-border: rgba(255, 255, 255, 0.08);
  --panel-hover: rgba(255, 255, 255, 0.12);
  --accent-ruby: #ff1464;
  --accent-magenta: #e01e5a;
  --accent-gold: #ffb703;
  --accent-cyan: #00f5d4;
  --accent-purple: #9d4edd;
  --text-primary: #f8f9fa;
  --text-secondary: #a0a5b5;
  --text-muted: #6c7285;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-math: 'KaTeX_Math', 'Cambria Math', 'Times New Roman', serif;
  --font-code: 'JetBrains Mono', 'Fira Code', monospace;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-glow: 0 0 25px rgba(255, 20, 100, 0.25);
  --shadow-panel: 0 16px 36px rgba(0, 0, 0, 0.6);
}

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

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-main);
  overflow: hidden;
  width: 100vw;
  height: 100vh;
  user-select: none;
  -webkit-font-smoothing: antialiased;
}

/* Canvas container */
#canvas-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 1;
}

/* Main Top Bar / Brand Header */
.top-nav {
  position: absolute;
  top: 18px;
  left: 24px;
  right: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 10;
  pointer-events: none;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 10px 18px;
  border-radius: var(--radius-lg);
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow-panel);
  pointer-events: auto;
}

.brand-icon {
  font-size: 1.4rem;
  color: var(--accent-ruby);
  animation: pulse-glow 3s infinite alternate;
}

.brand-title {
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  background: linear-gradient(135deg, #fff 30%, var(--accent-ruby) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-subtitle {
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.top-actions {
  display: flex;
  gap: 10px;
  pointer-events: auto;
}

/* Glass Buttons */
.btn-glass {
  background: var(--panel-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--panel-border);
  color: var(--text-primary);
  padding: 9px 16px;
  border-radius: var(--radius-md);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: var(--shadow-panel);
}

.btn-glass:hover {
  background: var(--panel-hover);
  border-color: rgba(255, 20, 100, 0.4);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: var(--shadow-glow);
}

.btn-glass.active {
  background: linear-gradient(135deg, rgba(255, 20, 100, 0.3), rgba(157, 78, 221, 0.3));
  border-color: var(--accent-ruby);
  color: #fff;
  box-shadow: var(--shadow-glow);
}

/* Floating Controls Sidebar (Left) */
.controls-sidebar {
  position: absolute;
  top: 80px;
  left: 24px;
  bottom: 24px;
  width: 340px;
  background: var(--panel-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-panel);
  z-index: 10;
  display: flex;
  flex-direction: column;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  overflow: hidden;
}

.controls-sidebar.collapsed {
  transform: translateX(-360px);
  opacity: 0;
  pointer-events: none;
}

.sidebar-header {
  padding: 16px 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--panel-border);
}

.sidebar-header h2 {
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-body {
  padding: 18px 20px;
  overflow-y: auto;
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 20px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

.sidebar-body::-webkit-scrollbar {
  width: 5px;
}
.sidebar-body::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 4px;
}

/* Control Group Sections */
.control-section {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.section-title {
  font-size: 0.76rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
}

/* Form Controls */
.control-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.control-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.control-val {
  font-family: var(--font-code);
  font-size: 0.78rem;
  color: var(--accent-ruby);
  font-weight: 600;
}

/* Custom Range Slider */
input[type="range"] {
  -webkit-appearance: none;
  width: 100%;
  height: 5px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
  outline: none;
  transition: background 0.2s;
}

input[type="range"]:hover {
  background: rgba(255, 255, 255, 0.18);
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--accent-ruby);
  cursor: pointer;
  box-shadow: 0 0 10px var(--accent-ruby);
  transition: transform 0.15s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.25);
}

/* Select Dropdown */
select {
  width: 100%;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--panel-border);
  color: var(--text-primary);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  outline: none;
  cursor: pointer;
  transition: border-color 0.2s;
}

select:focus, select:hover {
  border-color: var(--accent-ruby);
}

select option {
  background: #110d1c;
  color: #fff;
}

/* Button Grids */
.btn-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
}

.mode-btn {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--panel-border);
  color: var(--text-secondary);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.2s;
  text-align: center;
}

.mode-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.2);
}

.mode-btn.active {
  background: rgba(255, 20, 100, 0.2);
  border-color: var(--accent-ruby);
  color: #fff;
  box-shadow: 0 0 12px rgba(255, 20, 100, 0.3);
}

/* Theme Color Dots */
.theme-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.theme-dot {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: transform 0.2s, border-color 0.2s;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
}

.theme-dot:hover {
  transform: scale(1.18);
}

.theme-dot.active {
  border-color: #ffffff;
  transform: scale(1.22);
  box-shadow: 0 0 14px currentColor;
}

.theme-ruby { background: linear-gradient(135deg, #ff1464, #790022); }
.theme-crimsonSilk { background: linear-gradient(135deg, #bf092f, #ffd166); }
.theme-gold { background: linear-gradient(135deg, #ffb703, #fb8500); }
.theme-cyberpunk { background: linear-gradient(135deg, #00f5d4, #7b2cbf); }
.theme-nebula { background: linear-gradient(135deg, #4cc9f0, #7209b7); }
.theme-orchid { background: linear-gradient(135deg, #f72585, #560bad); }

/* Bottom Floating Math HUD (Faithful overlay like img.jpg) */
.math-hud {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(12, 8, 20, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-lg);
  padding: 16px 28px;
  box-shadow: var(--shadow-panel), var(--shadow-glow);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  pointer-events: auto;
  max-width: 90vw;
  text-align: center;
  transition: all 0.3s ease;
}

.math-hud.hidden-hud {
  display: none !important;
}

.math-hud:hover {
  border-color: rgba(255, 20, 100, 0.4);
}

.math-live-readout {
  font-family: var(--font-code);
  font-size: 0.76rem;
  color: var(--text-secondary);
  background: rgba(0, 0, 0, 0.45);
  padding: 5px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  align-items: center;
  gap: 6px;
  letter-spacing: 0.02em;
}

.math-live-readout strong {
  color: #fff;
}

.badge-live {
  background: rgba(255, 20, 100, 0.25);
  color: #ff2a6d;
  border: 1px solid rgba(255, 20, 100, 0.6);
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.08em;
  animation: pulse-badge 1.5s infinite alternate;
}

.badge-complete {
  background: rgba(0, 245, 212, 0.2);
  color: #00f5d4;
  border: 1px solid rgba(0, 245, 212, 0.5);
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.08em;
}

@keyframes pulse-badge {
  0% { opacity: 0.7; transform: scale(0.98); }
  100% { opacity: 1; transform: scale(1.04); }
}

.math-formula-row {
  font-size: 1.05rem;
  color: #ff9ebb;
  letter-spacing: 0.02em;
  text-shadow: 0 0 10px rgba(255, 20, 100, 0.4);
}

.math-formula-row.primary {
  color: #ffd6e0;
  font-size: 1.12rem;
}

/* Math Theory Right Sidebar Drawer */
.math-sidebar {
  position: absolute;
  top: 80px;
  right: 24px;
  bottom: 24px;
  width: 380px;
  background: var(--panel-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-panel);
  z-index: 10;
  display: flex;
  flex-direction: column;
  transform: translateX(420px);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  overflow: hidden;
}

.math-sidebar.open {
  transform: translateX(0);
  opacity: 1;
  pointer-events: auto;
}

.math-card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transition: border-color 0.2s;
}

.math-card:hover {
  border-color: rgba(255, 20, 100, 0.3);
}

.math-card h3 {
  font-size: 0.85rem;
  color: var(--accent-ruby);
  display: flex;
  align-items: center;
  gap: 6px;
}

.math-card p {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.math-card .formula-box {
  background: rgba(0, 0, 0, 0.4);
  padding: 10px;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  text-align: center;
  overflow-x: auto;
}

/* ==========================================================================
   Mobile Responsive Navigation & Bottom Dock
   ========================================================================== */

/* Backdrop overlay when mobile drawer is open */
.drawer-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 95;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.drawer-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

/* Mobile Bottom Dock */
.mobile-bottom-dock {
  display: none;
  position: fixed;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--panel-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--panel-border);
  border-radius: 30px;
  padding: 6px 12px;
  box-shadow: var(--shadow-panel), var(--shadow-glow);
  z-index: 90;
  gap: 6px;
  align-items: center;
}

.dock-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  font-size: 0.65rem;
  gap: 2px;
}

.dock-btn svg {
  width: 20px;
  height: 20px;
}

.dock-btn:active, .dock-btn:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.1);
}

.dock-btn.active {
  color: #fff;
  background: linear-gradient(135deg, rgba(255, 20, 100, 0.4), rgba(157, 78, 221, 0.4));
  box-shadow: 0 0 12px rgba(255, 20, 100, 0.4);
}

/* Responsive Breakpoints */
@media (max-width: 900px) {
  .top-actions {
    display: none; /* Replaced by bottom dock on mobile */
  }

  .mobile-bottom-dock {
    display: flex;
  }

  .floating-btn-left {
    display: none;
  }

  .top-nav {
    top: 12px;
    left: 14px;
    right: 14px;
  }

  .brand {
    padding: 8px 14px;
    gap: 10px;
  }

  .brand-title {
    font-size: 0.92rem;
  }

  .brand-subtitle {
    display: none;
  }

  /* Sidebars turn into elegant Mobile Bottom Sheets */
  .controls-sidebar {
    position: fixed;
    top: auto;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    max-height: 80vh;
    border-radius: 24px 24px 0 0;
    transform: translateY(105%);
    opacity: 1;
    z-index: 100;
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.8);
    pointer-events: auto;
  }

  .controls-sidebar.open {
    transform: translateY(0);
    opacity: 1;
  }

  .controls-sidebar.collapsed {
    transform: translateY(105%);
    opacity: 1;
  }

  .math-sidebar {
    position: fixed;
    top: auto;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    max-height: 80vh;
    border-radius: 24px 24px 0 0;
    transform: translateY(105%);
    opacity: 1;
    z-index: 100;
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.8);
  }

  .math-sidebar.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  /* Sheet Drag Handle */
  .sheet-handle {
    width: 40px;
    height: 4px;
    background: rgba(255, 255, 255, 0.25);
    border-radius: 2px;
    margin: 6px auto 10px auto;
  }

  /* Math HUD on Mobile */
  .math-hud {
    bottom: 80px; /* Sits cleanly above the bottom dock */
    padding: 8px 14px;
    max-width: 94vw;
    gap: 6px;
  }

  .math-formula-row {
    font-size: clamp(0.72rem, 3.2vw, 0.95rem);
  }

  .math-formula-row.primary {
    font-size: clamp(0.78rem, 3.6vw, 1.02rem);
  }

  .math-live-readout {
    font-size: clamp(0.62rem, 2.6vw, 0.72rem);
    padding: 3px 8px;
    flex-wrap: wrap;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .btn-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .theme-row {
    gap: 8px;
    justify-content: space-between;
  }

  .theme-dot {
    width: 24px;
    height: 24px;
  }

  .mobile-bottom-dock {
    bottom: 12px;
    padding: 4px 8px;
    gap: 4px;
  }

  .dock-btn {
    width: 40px;
    height: 40px;
  }
}