:root {
  --app-background: #f7f5f1;
  --app-text: #1c1b1a;
  --app-muted: #6f6a64;
  --app-surface: #ffffff;
  --app-surface-alt: #f1ede7;
  --app-surface-hover: #e6e1d8;
  --app-border: #d5cfc4;
  --app-accent: #2563eb;
  --app-accent-contrast: #f8fafc;
  --app-overlay: rgba(247, 245, 241, 0.95);
  --app-pre-background: #f0ece6;
  --slide-control: rgba(16, 17, 18, 0.35);
  --slide-control-hover: rgba(16, 17, 18, 0.85);
  --slide-control-bg-hover: rgba(16, 17, 18, 0.08);
  --panel-background: var(--app-surface);
  --panel-text: var(--app-text);
  --panel-accent: var(--app-accent);
  --panel-border: var(--app-border);
  --slide-font-size: 3.5rem;
  --slide-line-height: 1.5;
  --cifra-font-size: 1rem;
  --cifra-line-height: 1.5;
}

@media (prefers-color-scheme: dark) {
  :root {
    --app-background: #121212;
    --app-text: #e8eaed;
    --app-muted: #9aa0a6;
    --app-surface: #202124;
    --app-surface-alt: #2b2c2f;
    --app-surface-hover: #3c4043;
    --app-border: #3c4043;
    --app-accent: #8ab4f8;
    --app-accent-contrast: #101112;
    --app-overlay: rgba(18, 18, 18, 0.95);
    --app-pre-background: #1e1e1e;
    --slide-control: rgba(255, 255, 255, 0.3);
    --slide-control-hover: rgba(255, 255, 255, 0.8);
    --slide-control-bg-hover: rgba(255, 255, 255, 0.05);
  }
}

:root[data-theme="light"] {
  --app-background: #f7f5f1;
  --app-text: #1c1b1a;
  --app-muted: #6f6a64;
  --app-surface: #ffffff;
  --app-surface-alt: #f1ede7;
  --app-surface-hover: #e6e1d8;
  --app-border: #d5cfc4;
  --app-accent: #2563eb;
  --app-accent-contrast: #f8fafc;
  --app-overlay: rgba(247, 245, 241, 0.95);
  --app-pre-background: #f0ece6;
  --slide-control: rgba(16, 17, 18, 0.35);
  --slide-control-hover: rgba(16, 17, 18, 0.85);
  --slide-control-bg-hover: rgba(16, 17, 18, 0.08);
}

:root[data-theme="dark"] {
  --app-background: #121212;
  --app-text: #e8eaed;
  --app-muted: #9aa0a6;
  --app-surface: #202124;
  --app-surface-alt: #2b2c2f;
  --app-surface-hover: #3c4043;
  --app-border: #3c4043;
  --app-accent: #8ab4f8;
  --app-accent-contrast: #101112;
  --app-overlay: rgba(18, 18, 18, 0.95);
  --app-pre-background: #1e1e1e;
  --slide-control: rgba(255, 255, 255, 0.3);
  --slide-control-hover: rgba(255, 255, 255, 0.8);
  --slide-control-bg-hover: rgba(255, 255, 255, 0.05);
}

body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--app-background);
  color: var(--app-text);
  margin: 0;
  padding: 0;
}

main {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 24px 16px 160px;
  box-sizing: border-box;
}

h4 {
  margin: 16px 0 8px;
  font-weight: 600;
}

#toggle-original {
  cursor: pointer;
}

pre {
  background: var(--app-pre-background);
  padding: 16px;
  border-radius: 8px;
  overflow-x: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
  line-height: 1.5;
  min-height: 160px;
}

#cifra,
#cifra_original {
  font-size: var(--cifra-font-size);
  line-height: var(--cifra-line-height);
}

#cifra span {
  background: rgba(255, 183, 3, 0.3);
  border-radius: 8px;
  padding: 0 8px;
}

.hidden {
  display: none !important;
}

.collapsed-original {
  display: none;
}

/* Search UI */
.floating-button {
  position: fixed;
  right: 24px;
  z-index: 100;
  background: var(--panel-accent);
  color: var(--app-accent-contrast);
  border: none;
  border-radius: 50%;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(0,0,0,0.3);
  transition: transform 0.2s, opacity 0.3s;
}

#search-trigger {
  top: 24px;
}

#fullscreen-trigger {
  top: 96px; /* 24px + 56px + 16px gap */
}

.floating-button:hover {
  transform: scale(1.05);
}

#search-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--app-overlay);
  z-index: 200;
  display: flex;
  justify-content: center;
  padding: 24px;
  backdrop-filter: blur(5px);
}

.search-container {
  width: 100%;
  max-width: 600px;
  display: flex;
  flex-direction: column;
  height: 80vh;
}

.search-header {
  display: flex;
  gap: 16px;
  margin-bottom: 24px;
}

#search-input {
  flex: 1;
  font-size: 1.2rem;
  padding: 16px;
  background: var(--app-surface-alt);
  border: 1px solid var(--panel-border);
  color: var(--app-text);
  border-radius: 8px;
}

#close-search {
  background: transparent;
  border: none;
  color: var(--app-text);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0 16px;
}

#search-results {
  list-style: none;
  padding: 0;
  margin: 0;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.search-result-item {
  background: var(--app-surface-alt);
  padding: 16px;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
}

.search-result-item:hover {
  background: var(--app-surface-hover);
}

.search-result-item.active {
  background: var(--app-surface-hover);
  box-shadow: 0 0 0 2px var(--panel-accent);
}

.result-title {
  font-weight: bold;
  font-size: 1.1rem;
  display: block;
  margin-bottom: 4px;
  color: var(--panel-accent);
}

.result-snippet {
  font-size: 0.9rem;
  color: var(--app-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Presentation Mode Adjustments */
#letra_view {
  display: flex;
  flex-direction: column;
  gap: 16px;
  /* Full screen capability */
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 50;
  background: var(--app-background);
  padding: 0;
  margin: 0;
}

.slide-controls {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  pointer-events: none; /* Let clicks pass through to content if needed, but buttons need pointer-events: auto */
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: transparent;
  padding: 0;
  box-shadow: none;
  border-radius: 0;
}

.slide-button {
  pointer-events: auto;
  background: transparent;
  color: var(--slide-control);
  font-size: 3rem;
  height: 100%;
  width: 80px;
  border-radius: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s, color 0.3s;
}

.slide-button:hover {
  background: var(--slide-control-bg-hover);
  color: var(--slide-control-hover);
}

.slide-button:disabled {
  color: transparent;
  background: transparent;
  cursor: default;
}

.slide-meta {
  position: absolute;
  bottom: 24px;
  left: 0;
  right: 0;
  pointer-events: auto;
  opacity: 0.5;
  transition: opacity 0.3s;
}

.slide-meta:hover {
  opacity: 1;
}

#slide_content {
  width: 100%;
  height: 100%;
  box-sizing: border-box;
  padding: 40px 80px 80px; /* Space for buttons and meta */
  display: flex;
  flex-direction: column;
  justify-content: center;
  /* Center alignment by default */
  align-items: center; 
  text-align: center;
  overflow-y: auto;
  background: var(--app-background);
  box-shadow: none;
  border-radius: 0;
  overflow-x: hidden; /* Prevent horizontal scroll */
}

body.compact-mode #slide_content {
  overflow: hidden;
}

body.compact-mode #line_height_controls,
body.compact-mode #font_size_controls,
body.compact-mode #column_controls {
  display: none;
}

body.mode-cifra #column_controls {
  display: none;
}

#slide_content p {
  font-size: var(--slide-font-size);
  line-height: var(--slide-line-height);
  margin: 0 0 calc(var(--slide-line-height) * 1rem); /* Dynamic margin */
  break-inside: avoid;
}

/* Specific styling for the main title on the first slide */
.slide-main-title {
  font-size: calc(var(--slide-font-size) * 1.5);
  font-weight: 800;
  margin-bottom: 32px;
  line-height: 1.2;
  color: var(--panel-accent);
}

/* Compact Mode Headers */
.compact-header {
  font-size: calc(var(--slide-font-size) * 0.8);
  color: var(--panel-accent);
  margin: 24px 0 12px;
  font-weight: 700;
  break-after: avoid;
}

/* Two columns layout for larger text */
#slide_content.two-columns {
  display: block; /* Required for column-count */
  column-count: 2;
  column-gap: 64px;
  column-rule: 1px solid var(--panel-border);
  text-align: left;
  align-items: start;
  justify-content: start;
  width: 100%;
}

body.compact-mode #slide_content.two-columns {
  column-fill: auto;
}

#slide_content.two-columns p {
  text-align: left;
  max-width: 100%;
  margin-bottom: calc(var(--slide-line-height) * 1.5rem);
  width: 100%; /* Ensure p doesn't overflow column */
  box-sizing: border-box;
}

body.compact-mode #slide_content p.empty-line {
  margin-bottom: calc(var(--slide-line-height) * 0.6rem);
}

/* Override Main padding when in Letra mode */
body.mode-letra main {
  padding: 0;
  max-width: none;
}
body.mode-letra #cifra_view {
  display: none;
}

/* Visible but transparent search in letra mode */
body.mode-letra #search-trigger,
body.mode-letra #fullscreen-trigger {
  opacity: 0.3;
  transition: opacity 0.3s;
}

body.mode-letra #search-trigger:hover,
body.mode-letra #fullscreen-trigger:hover {
  opacity: 1;
}

#control-panel {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--panel-background);
  color: var(--panel-text);
  border-top: 1px solid var(--panel-border);
  box-shadow: 0 -8px 24px rgba(0, 0, 0, 0.35);
  transition: transform 0.3s ease-in-out;
  z-index: 60; /* Above slide view */
}

#control-panel.collapsed .controls-inner {
  display: none;
}

#panel-toggle {
  width: 100%;
  background: transparent;
  color: var(--panel-text);
  border: none;
  padding: 16px 24px;
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 600;
  cursor: pointer;
}

.controls-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding: 16px 24px 24px;
  border-top: 1px solid var(--panel-border);
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 160px;
}

.control-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--app-muted);
}

.mode-switch {
  display: flex;
  gap: 8px;
}

.mode-button {
  flex: 1;
  padding: 8px 16px;
  border-radius: 24px;
  border: 1px solid var(--panel-border);
  background: transparent;
  color: var(--panel-text);
  cursor: pointer;
  font-weight: 600;
  transition: background 0.2s ease;
}

.mode-button.active {
  background: var(--panel-accent);
  color: var(--app-accent-contrast);
  border-color: var(--panel-accent);
}

select,
input[type="text"],
button {
  font-family: inherit;
}

select,
input[type="text"] {
  padding: 8px 16px;
  border-radius: 8px;
  border: 1px solid var(--panel-border);
  background: var(--app-surface-alt);
  color: var(--panel-text);
}

select:focus,
input[type="text"]:focus,
button:focus {
  outline: 2px solid var(--panel-accent);
  outline-offset: 2px;
}

.toggle-control {
  display: flex;
  align-items: center;
  background: var(--app-surface-alt);
  border: 1px solid var(--panel-border);
  border-radius: 8px;
  padding: 8px 16px;
}

.toggle-control .toggle-text {
  font-size: 0.85rem;
  color: var(--app-muted);
}

.toggle-control input {
  appearance: none;
  width: 42px;
  height: 22px;
  background: var(--app-surface-hover);
  border-radius: 999px;
  position: relative;
  margin: 0 8px;
  cursor: pointer;
  transition: background 0.2s ease;
}

.toggle-control input::before {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--panel-accent);
  transition: transform 0.2s ease;
}

.toggle-control input:checked {
  background: var(--panel-border);
}

.toggle-control input:checked::before {
  transform: translateX(20px);
}

.tone-buttons {
  display: grid;
  grid-template-columns: repeat(3, auto);
  gap: 8px;
  align-items: center;
}

.tone-buttons button {
  background: var(--panel-accent);
  border: none;
  color: var(--app-accent-contrast);
  padding: 8px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
}

.tone-buttons input {
  text-align: center;
  width: 64px;
}

.presentation-options {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
}

#column_controls {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.font-controls {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--app-surface-alt);
  border-radius: 24px;
  padding: 8px 16px;
}

.font-controls button {
  border: none;
  background: transparent;
  color: var(--panel-text);
  font-weight: 700;
  cursor: pointer;
}

.font-controls button:hover {
  color: var(--panel-accent);
}

@media (max-width: 720px) {
  main {
    padding: 24px 16px 200px;
  }

  .controls-inner {
    flex-direction: column;
  }

  .tone-buttons {
    grid-template-columns: 1fr;
  }

  .slide-content {
    padding: 24px;
    font-size: calc(var(--slide-font-size) * 0.9);
  }

  .slide-content.two-columns {
    column-count: 1;
  }
}