@font-face {
  font-family: 'Dumbeldor';
  src: url('/dumbeldor.ttf'), format('ttf');
  font-weight: normal;
  font-style: normal;
}

/* ============================================================================
   Base Styles
   ============================================================================ */

:root {
  /* Dark gray color palette */
  --color-gray-900: #121212;
  --color-gray-800: #1a1a1a;
  --color-gray-700: #242424;
  --color-gray-600: #2e2e2e;
  --color-gray-500: #3a3a3a;
  --color-gray-400: #4a4a4a;
  --color-gray-300: #6a6a6a;
  --color-gray-200: #8a8a8a;
  --color-gray-100: #aaaaaa;

  /* UI Colors */
  --panel-bg: rgba(18, 18, 18, 0.95);
  --panel-border: rgba(255, 255, 255, 0.1);
  --section-bg: rgba(255, 255, 255, 0.05);
  --section-hover: rgba(255, 255, 255, 0.08);
  --input-bg: rgba(0, 0, 0, 0.3);
  --input-border: rgba(255, 255, 255, 0.1);
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --text-muted: rgba(255, 255, 255, 0.4);
  --accent: #6b9fff;
  --accent-hover: #8bb4ff;

  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 12px;
  --spacing-lg: 16px;
  --spacing-xl: 24px;

  /* Borders - reduced by 50% */
  --radius-sm: 3px;
  --radius-md: 5px;
  --radius-lg: 8px;
  --radius-xl: 12px;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.2s ease;
}

html,
body {
  margin: 0;
  background-color: #273940;
  width: 100%;
  height: 100%;
  overflow: hidden;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

h1 {
  font-family: 'Dumbeldor', serif;
  font-size: 3em;
  text-decoration: underline;
}

h2 {
  font-family: 'Dumbeldor', serif;
  font-size: 2em;
}

h3 {
  font-family: 'Dumbeldor', serif;
  font-size: 1.5em;
}

a {
  color: white;
  font-size: 1.5em;
}

#root {
  width: 100%;
  height: 100%;
}

#app {
  height: 100%;
}

/* ============================================================================
   Custom Panel
   ============================================================================ */

#ui-container {
  position: fixed;
  top: 12px;
  right: 12px;
  width: 320px;
  max-height: calc(100vh - 24px);
  z-index: 100;
}

.custom-panel {
  background: var(--panel-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-xl);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 24px);
}

.panel-header {
  padding: var(--spacing-lg) var(--spacing-xl);
  text-align: center;
  border-bottom: 1px solid var(--panel-border);
  flex-shrink: 0;
  position: relative;
}

.panel-mobile-toggle {
  display: none;
}

.panel-title {
  font-family: 'Dumbeldor', serif;
  font-size: 1.8em;
  color: var(--text-primary);
  margin: 0;
  letter-spacing: 1px;
}

.panel-subtitle {
  font-size: 0.7em;
  color: var(--text-muted);
  margin: var(--spacing-md) 0 0 0;
  text-transform: uppercase;
  letter-spacing: 2px;
}

.panel-scroll-area {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--spacing-md);
  scrollbar-width: thin;
  scrollbar-color: var(--gray-400) transparent;
}

.panel-scroll-area::-webkit-scrollbar {
  width: 6px;
}

.panel-scroll-area::-webkit-scrollbar-track {
  background: transparent;
}

.panel-scroll-area::-webkit-scrollbar-thumb {
  background: var(--color-gray-400);
  border-radius: 3px;
}

.panel-scroll-area::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-300);
}

/* ============================================================================
   Tab Navigation
   ============================================================================ */

.tab-nav {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.tab-button {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  font-size: 0.85em;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.tab-button:hover {
  background: var(--section-hover);
  color: var(--text-primary);
}

.tab-button.active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--color-gray-900);
}

.tab-button .icon {
  width: 18px;
  height: 18px;
}

.tab-button.active .icon {
  stroke: var(--color-gray-900);
}

.tab-label {
  font-weight: 600;
}

.tab-content {
  display: none;
}

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

/* ============================================================================
   Sections
   ============================================================================ */

.panel-section {
  background: var(--section-bg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-sm);
  overflow: hidden;
  border: 1px solid transparent;
  transition: border-color var(--transition-fast);
}

.panel-section:hover {
  border-color: var(--panel-border);
}

.section-header {
  display: flex;
  align-items: center;
  padding: var(--spacing-md) var(--spacing-md);
  cursor: pointer;
  user-select: none;
  transition: background var(--transition-fast);
}

.section-header:hover {
  background: var(--section-hover);
}

.section-header .icon {
  width: 18px;
  height: 18px;
  margin-right: var(--spacing-sm);
  color: var(--text-secondary);
  flex-shrink: 0;
}

.section-title {
  flex: 1;
  font-size: 0.9em;
  font-weight: 600;
  color: var(--text-primary);
}

.section-arrow {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
  flex-shrink: 0;
}

.panel-section.expanded .section-arrow {
  transform: rotate(90deg);
}

.section-content {
  max-height: 0;
  overflow: hidden;
}

.panel-section.expanded .section-content {
  max-height: 2000px;
  padding: var(--spacing-xs) var(--spacing-md) var(--spacing-md);
}

/* ============================================================================
   Subsections
   ============================================================================ */

.panel-subsection {
  background: rgba(0, 0, 0, 0.2);
  border-radius: var(--radius-sm);
  margin-top: var(--spacing-sm);
  overflow: hidden;
}

.subsection-header {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  user-select: none;
  transition: background var(--transition-fast);
}

.subsection-header:hover {
  background: rgba(255, 255, 255, 0.03);
}

.subsection-title {
  flex: 1;
  font-size: 0.8em;
  font-weight: 500;
  color: var(--text-secondary);
}

.subsection-arrow {
  width: 14px;
  height: 14px;
  color: var(--text-muted);
  transition: transform var(--transition-fast);
}

.panel-subsection.expanded .subsection-arrow {
  transform: rotate(90deg);
}

.subsection-content {
  max-height: 0;
  overflow: hidden;
}

.panel-subsection.expanded .subsection-content {
  max-height: 1000px;
  padding: var(--spacing-xs) var(--spacing-md) var(--spacing-md);
}

/* ============================================================================
   Control Rows
   ============================================================================ */

.control-row {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-xs) 0;
}

.control-label {
  width: 80px;
  min-width: 80px;
  flex-shrink: 0;
  font-size: 0.8em;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ============================================================================
   Sliders
   ============================================================================ */

.slider-wrapper {
  flex: 1;
  min-width: 0;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.slider {
  flex: 1;
  min-width: 0;
  -webkit-appearance: none;
  appearance: none;
  height: 4px;
  background: var(--color-gray-600);
  border-radius: 2px;
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  background: var(--text-primary);
  border-radius: 50%;
  cursor: pointer;
  transition: transform var(--transition-fast);
  border: none;
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.1);
}

.slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--text-primary);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.slider-value {
  width: 48px;
  min-width: 48px;
  flex-shrink: 0;
  font-size: 0.75em;
  color: var(--text-primary);
  text-align: right;
  font-family: 'SF Mono', Monaco, 'Courier New', monospace;
  background: var(--input-bg);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  border: 1px solid var(--input-border);
  box-sizing: content-box;
  -moz-appearance: textfield;
}

.slider-value::-webkit-outer-spin-button,
.slider-value::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.slider-value:focus {
  outline: none;
  border-color: var(--accent);
}

/* ============================================================================
   Color Picker
   ============================================================================ */

.color-picker-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.color-preview {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--input-border);
}

.color-picker {
  flex: 1;
  height: 28px;
  padding: 0;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: transparent;
}

.color-picker::-webkit-color-swatch-wrapper {
  padding: 0;
}

.color-picker::-webkit-color-swatch {
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
}

/* ============================================================================
   Select Dropdown
   ============================================================================ */

.select-wrapper {
  flex: 1;
}

.select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.8em;
  cursor: pointer;
  outline: none;
  transition: border-color var(--transition-fast);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23888' d='M6 8L2 4h8z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 30px;
}

.select:hover {
  border-color: var(--color-gray-400);
}

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

.select option {
  background: var(--color-gray-800);
  color: var(--text-primary);
  padding: var(--spacing-sm);
}

/* ============================================================================
   Toggle Button
   ============================================================================ */

.toggle-wrapper {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.toggle {
  width: 40px;
  height: 22px;
  background: var(--color-gray-600);
  border: none;
  border-radius: 11px;
  cursor: pointer;
  transition: background var(--transition-fast);
  position: relative;
  padding: 0;
}

.toggle:hover {
  background: var(--color-gray-500);
}

.toggle.active {
  background: var(--accent);
}

.toggle-knob {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  background: white;
  border-radius: 50%;
  transition: transform var(--transition-fast);
}

.toggle.active .toggle-knob {
  transform: translateX(18px);
}

/* ============================================================================
   Buttons
   ============================================================================ */

.panel-button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-md);
  background: var(--section-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.85em;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-top: var(--spacing-sm);
}

.panel-button:hover {
  background: var(--section-hover);
  border-color: var(--color-gray-400);
}

.panel-button:active {
  background: var(--color-gray-600);
}

.panel-button .icon {
  width: 16px;
  height: 16px;
}

/* ============================================================================
   Display (Read-only values)
   ============================================================================ */

.display-row {
  padding: var(--spacing-xs) 0;
}

.display-value {
  flex: 1;
  text-align: right;
  font-size: 0.8em;
  color: var(--text-secondary);
  font-family: 'SF Mono', Monaco, 'Courier New', monospace;
}

/* ============================================================================
   About & Audio Icons
   ============================================================================ */

.about-icon {
  display: none;
}

.audio-icon {
  display: none;
  position: fixed;
  top: 16px;
  left: 80px;
  width: 40px;
  height: 40px;
  cursor: pointer;
  transition: transform var(--transition-fast), filter var(--transition-fast);
  z-index: 101;
}

.audio-icon:hover {
  transform: scale(1.1);
  filter: brightness(1.2);
}

/* ============================================================================
   Loading Screen
   ============================================================================ */

#loading-screen {
  background-image: url("/background.webp");
  width: 100%;
  height: 100%;
  position: fixed;
  z-index: 9999;
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  padding: 64px;
  box-sizing: border-box;
}

#logo {
  position: relative;
  margin: 64px;
  width: 100%;
  max-width: 600px;
  aspect-ratio: 1 / 1;
  clip-path: inset(100% 0 0 0);
  will-change: clip-path;
}

#loading-text {
  font-size: 5em;
  color: white;
  font-family: 'Dumbeldor', serif;
  text-shadow: 0 4px 8px rgba(0, 0, 0, 0.5);
}

/* ============================================================================
   About Dialog Overlay
   ============================================================================ */

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
  z-index: 200;
}

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

.about-dialog {
  background: linear-gradient(135deg, #1e1e1e, #333);
  color: #fff;
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 500px;
  padding: 32px;
  margin: 16px;
  text-align: center;
  position: relative;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.about-dialog img {
  width: 128px;
  height: 128px;
  border-radius: var(--radius-md);
}

.social-icons {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 32px;
}

.social-icons a {
  color: #fff;
  font-size: 24px;
  transition: color 0.2s;
}

.social-icons a:hover {
  color: var(--accent);
}

.close-button {
  margin-top: 24px;
  padding: 12px 24px;
  border: none;
  background: var(--color-gray-600);
  color: #fff;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s;
  font-family: 'Dumbeldor', serif;
  font-size: 1.2em;
}

.close-button:hover {
  background: var(--color-gray-500);
}

/* Course CTA in About Dialog */
.course-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin: 24px auto 0;
  padding: 14px 24px;
  background: linear-gradient(135deg, #4a7c59 0%, #2d5a3d 100%);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: transform 0.2s, box-shadow 0.2s;
  max-width: 280px;
}

.course-cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(74, 124, 89, 0.4);
}

.course-cta-label {
  font-size: 0.7em;
  color: rgba(255, 255, 255, 0.8);
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
}

.course-cta {
  position: relative;
}

.course-cta-title {
  font-family: 'Dumbeldor', serif;
  font-size: 1.3em;
  color: #fff;
}

.course-cta-arrow {
  font-size: 1.4em;
  color: rgba(255, 255, 255, 0.9);
}

/* ============================================================================
   Panel Footer
   ============================================================================ */

.panel-footer {
  padding: var(--spacing-sm) var(--spacing-md);
  border-top: 1px solid var(--panel-border);
  text-align: center;
  flex-shrink: 0;
}

.panel-footer-link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: 8px;
  margin-bottom: 8px;
  color: var(--text-primary);
  font-size: 0.85em;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.panel-footer-link:hover {
  color: var(--accent);
}

.panel-footer-link .icon {
  width: 12px;
  height: 12px;
}

/* ============================================================================
   Mobile Responsive Styles
   ============================================================================ */

@media (max-width: 800px) {
  #root {
    display: flex;
    flex-direction: column;
    height: 100%;
  }

  #app {
    flex: 1;
    height: auto;
    min-height: 0;
  }

  #ui-container {
    position: relative;
    top: auto;
    right: auto;
    width: 100%;
    max-height: none;
    flex-shrink: 0;
  }

  .custom-panel {
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    max-height: 55vh;
    height: auto;
  }

  .custom-panel.collapsed {
    max-height: none;
  }

  .custom-panel.collapsed .panel-scroll-area,
  .custom-panel.collapsed .panel-footer {
    display: none;
  }

  .custom-panel.collapsed .panel-mobile-toggle .icon {
    transform: rotate(180deg);
  }

  .panel-mobile-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-md);
    width: 32px;
    height: 32px;
    background: var(--section-bg);
    border: 1px solid var(--panel-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    color: var(--text-secondary);
    padding: 0;
  }

  .panel-mobile-toggle:hover {
    background: var(--section-hover);
    color: var(--text-primary);
  }

  .panel-mobile-toggle .icon {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-fast);
  }

  .panel-header {
    padding: var(--spacing-md) var(--spacing-lg);
  }

  .panel-title {
    font-size: 1.4em;
  }

  .panel-subtitle {
    font-size: 0.6em;
  }

  .control-label {
    width: 70px;
    min-width: 70px;
    font-size: 0.75em;
  }

  .slider-value {
    width: 42px;
    min-width: 42px;
    font-size: 0.7em;
  }

  .tab-button {
    padding: var(--spacing-sm);
  }

  .tab-label {
    display: none;
  }

  .tab-button .icon {
    width: 20px;
    height: 20px;
  }
}

@media (max-width: 675px) {
  #loading-text {
    font-size: 4em;
  }
}

@media (max-width: 575px) {
  #loading-text {
    font-size: 3em;
  }

  .about-dialog {
    padding: 24px 16px;
  }

  .about-dialog h1 {
    font-size: 2em;
  }

  .about-dialog h2 {
    font-size: 1.2em;
  }

  .about-dialog h3 {
    font-size: 1em;
  }
}

@media (max-width: 475px) {
  #loading-text {
    font-size: 2em;
  }

  .control-label {
    width: 60px;
    min-width: 60px;
    font-size: 0.7em;
  }

  .slider-value {
    width: 38px;
    min-width: 38px;
  }
}