/* ==========================================================================
   BookDesk – A Hand-Crafted Literary Design System
   Vanilla CSS with premium typography, warm palettes, and tactile feedback.
   ========================================================================== */

/* --- Custom Variables & Tokens --- */
:root {
  /* Colors - Light Mode (Warm Alabaster & Sage Ink) */
  --bg-color: #f7f4eb;
  --bg-desk: #faf7ef;
  --bg-paper: #ffffff;
  --text-primary: #2b2823;
  --text-secondary: #6e675b;
  --accent-ink: #3e5c46;
  --accent-ink-hover: #2d4533;
  --accent-gold: #c19245;
  --accent-gold-dark: #a0742f;
  --accent-alert: #9b4737;
  --accent-alert-light: #fdf3f0;
  --border-ink: #dcd6c5;
  --border-ink-focus: #b2a994;
  --shadow-desk: 0 20px 40px rgba(43, 40, 35, 0.08);
  --shadow-paper: 0 4px 15px rgba(43, 40, 35, 0.04);
  
  /* Fonts */
  --font-serif: 'Lora', 'Georgia', serif;
  --font-sans: 'Instrument Sans', 'Inter', system-ui, sans-serif;
  
  /* System */
  --radius-desk: 2px;
  --radius-paper: 1px;
  --transition-organic: all 0.4s cubic-bezier(0.25, 1, 0.5, 1);
  --transition-fast: all 0.2s ease;
}

[data-theme="dark"] {
  /* Colors - Dark Mode (Night Library & Moss) */
  --bg-color: #121513;
  --bg-desk: #171c19;
  --bg-paper: #1c221f;
  --text-primary: #e8e2d5;
  --text-secondary: #a39b8b;
  --accent-ink: #5b8565;
  --accent-ink-hover: #6ea07a;
  --accent-gold: #cca562;
  --accent-gold-dark: #dfba7c;
  --accent-alert: #ce6754;
  --accent-alert-light: #2c1a17;
  --border-ink: #2d3832;
  --border-ink-focus: #44544b;
  --shadow-desk: 0 20px 50px rgba(0, 0, 0, 0.4);
  --shadow-paper: 0 4px 20px rgba(0, 0, 0, 0.2);
}

/* --- Base & Reset --- */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-color);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: var(--transition-organic);
  padding: 2rem 1rem;
  overflow-x: hidden;
  position: relative;
}

/* Subtle background texture overlay to mimic paper grain */
body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.015;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  z-index: 10;
}

[data-theme="dark"] body::before {
  opacity: 0.03;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-serif);
  font-weight: 500;
  line-height: 1.3;
  color: var(--text-primary);
}

p {
  color: var(--text-secondary);
}

/* --- The Desk Layout (Container) --- */
.desk-container {
  width: 100%;
  max-width: 820px;
  background-color: var(--bg-desk);
  border: 1px solid var(--border-ink);
  box-shadow: var(--shadow-desk);
  padding: 3rem 4rem;
  position: relative;
  transition: var(--transition-organic);
  margin-bottom: 2rem;
  overflow: hidden;
}

/* Asymmetric hand-made decorations */
.desk-container::after {
  content: "";
  position: absolute;
  top: 0;
  left: 15px;
  bottom: 0;
  width: 1px;
  background-color: rgba(220, 214, 197, 0.3);
}
[data-theme="dark"] .desk-container::after {
  background-color: rgba(45, 56, 50, 0.3);
}

/* --- Header & Top bar --- */
.top-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 3.5rem;
  border-bottom: 1px solid var(--border-ink);
  padding-bottom: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
}

.brand-icon {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: var(--accent-ink);
  stroke-width: 1.5;
}

.brand-title {
  font-size: 1.4rem;
  letter-spacing: -0.02rem;
}

.brand-title span {
  font-family: var(--font-sans);
  font-weight: 300;
  color: var(--text-secondary);
}

.controls-ledger {
  display: flex;
  align-items: center;
  gap: 1.2rem;
}

/* Small bespoke toggle switch for dark mode & sounds */
.ledger-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.4rem;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: var(--transition-fast);
  opacity: 0.8;
  border-bottom: 1px dashed transparent;
}

.ledger-btn:hover {
  opacity: 1;
  color: var(--accent-ink);
  border-color: var(--accent-ink);
}

.ledger-btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

/* --- Forms & Tactile Inputs --- */
.search-blotter {
  animation: fadeIn 0.6s cubic-bezier(0.25, 1, 0.5, 1);
}

.desk-intro {
  margin-bottom: 2.5rem;
}

.desk-intro h2 {
  font-size: 2.2rem;
  margin-bottom: 0.8rem;
  letter-spacing: -0.03rem;
}

.desk-intro p {
  font-size: 1.05rem;
  max-width: 580px;
}

.ink-form {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.input-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.input-group {
  display: flex;
  flex-direction: column;
  position: relative;
}

.input-group label {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05rem;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
  font-weight: 500;
}

/* Inputs styled as pencil-written blank lines */
.ink-input {
  background: transparent;
  border: none;
  border-bottom: 1.5px solid var(--border-ink);
  font-family: var(--font-serif);
  font-size: 1.15rem;
  color: var(--text-primary);
  padding: 0.5rem 0.2rem;
  outline: none;
  transition: var(--transition-fast);
  border-radius: 0;
}

.ink-input::placeholder {
  color: var(--border-ink-focus);
  opacity: 0.7;
  font-style: italic;
}

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

/* Hand-inked focus underline decoration */
.input-focus-line {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1.5px;
  background-color: var(--accent-ink);
  transition: width 0.3s ease;
}

.ink-input:focus ~ .input-focus-line {
  width: 100%;
}

/* --- Dynamic Refinement Form (Graceful Failure) --- */
.refinement-blotter {
  border: 1px dashed var(--border-ink);
  background-color: rgba(220, 214, 197, 0.1);
  padding: 2rem;
  margin-top: 1.5rem;
  position: relative;
  animation: slideDown 0.5s ease-out;
}

.refinement-blotter h3 {
  font-size: 1.3rem;
  margin-bottom: 0.8rem;
  color: var(--accent-alert);
}

.refinement-text {
  font-size: 0.95rem;
  margin-bottom: 1.5rem;
}

/* --- Bespoke Buttons --- */
.ink-btn {
  background-color: var(--accent-ink);
  color: var(--bg-paper);
  border: none;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08rem;
  padding: 0.9rem 2rem;
  cursor: pointer;
  transition: var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  border-radius: var(--radius-desk);
  align-self: flex-start;
  box-shadow: 0 4px 10px rgba(62, 92, 70, 0.15);
}

.ink-btn:hover {
  background-color: var(--accent-ink-hover);
  box-shadow: 0 6px 15px rgba(62, 92, 70, 0.25);
  transform: translateY(-1px);
}

.ink-btn:active {
  transform: translateY(1px);
}

.ink-btn.secondary {
  background: transparent;
  border: 1px solid var(--border-ink);
  color: var(--text-primary);
  box-shadow: none;
}

.ink-btn.secondary:hover {
  background-color: rgba(220, 214, 197, 0.2);
  border-color: var(--text-secondary);
  color: var(--text-primary);
  transform: none;
}

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

.btn-row {
  display: flex;
  gap: 1rem;
  align-items: center;
}

/* --- Search Loading Animation --- */
.loading-desk {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 0;
  animation: fadeIn 0.4s ease;
}

.loading-book {
  width: 48px;
  height: 48px;
  fill: none;
  stroke: var(--accent-ink);
  stroke-width: 1.5;
  animation: bookFlip 1.5s infinite ease-in-out;
}

.loading-text {
  margin-top: 1.5rem;
  font-family: var(--font-serif);
  font-style: italic;
  color: var(--text-secondary);
}

/* --- Result Layout (Reading Desk) --- */
.reading-desk {
  animation: fadeIn 0.8s cubic-bezier(0.25, 1, 0.5, 1);
}

.book-header {
  margin-bottom: 2.5rem;
  position: relative;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border-ink);
}

.book-tag {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08rem;
  color: var(--accent-gold);
  font-weight: 600;
  margin-bottom: 0.4rem;
  display: block;
}

.book-title-main {
  font-size: 2.4rem;
  letter-spacing: -0.04rem;
  margin-bottom: 0.4rem;
}

.book-author-main {
  font-size: 1.15rem;
  font-family: var(--font-sans);
  color: var(--text-secondary);
  font-weight: 300;
}

/* Option choosing board */
.ledger-board {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 3rem;
}

.ledger-card {
  border: 1px solid var(--border-ink);
  background: var(--bg-paper);
  padding: 1.5rem;
  cursor: pointer;
  transition: var(--transition-organic);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  position: relative;
  text-align: left;
  border-radius: var(--radius-paper);
}

.ledger-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: transparent;
  transition: var(--transition-fast);
}

.ledger-card:hover {
  box-shadow: var(--shadow-paper);
  border-color: var(--border-ink-focus);
  transform: translateY(-2px);
}

.ledger-card.active {
  border-color: var(--accent-ink);
  box-shadow: var(--shadow-paper);
}

.ledger-card.active::before {
  background-color: var(--accent-ink);
}

.ledger-card h4 {
  font-size: 1.1rem;
  color: var(--text-primary);
}

.ledger-card p {
  font-size: 0.85rem;
  line-height: 1.4;
}

/* --- Content Views --- */
.content-sheet {
  background-color: var(--bg-paper);
  border: 1px solid var(--border-ink);
  padding: 3rem;
  box-shadow: var(--shadow-paper);
  border-radius: var(--radius-paper);
  animation: sheetSlideUp 0.6s cubic-bezier(0.25, 1, 0.5, 1);
  position: relative;
}

/* Paper Deckle Decoration */
.content-sheet::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: repeating-linear-gradient(90deg, var(--border-ink), var(--border-ink) 4px, transparent 4px, transparent 8px);
}

.summary-block {
  display: flex;
  flex-direction: column;
  gap: 2.2rem;
}

.summary-section h3 {
  font-size: 1.3rem;
  margin-bottom: 0.8rem;
  color: var(--accent-ink);
  border-bottom: 1px dashed var(--border-ink);
  padding-bottom: 0.3rem;
  display: inline-block;
}

.summary-section p {
  font-family: var(--font-serif);
  font-size: 1.05rem;
  line-height: 1.75;
  color: var(--text-primary);
}

.summary-themes {
  margin-top: 1rem;
  padding-top: 1.5rem;
  border-top: 1.5px solid var(--border-ink);
}

.summary-themes h4 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 0.05rem;
  margin-bottom: 0.8rem;
  color: var(--text-secondary);
}

.theme-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.theme-tag {
  background-color: var(--bg-desk);
  border: 1px solid var(--border-ink);
  font-size: 0.85rem;
  padding: 0.3rem 0.8rem;
  color: var(--text-secondary);
  font-family: var(--font-sans);
}

/* Cliffhanger block */
.cliffhanger-block p {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  line-height: 1.8;
  color: var(--text-primary);
  font-style: italic;
  position: relative;
  padding-left: 1.5rem;
  border-left: 2px solid var(--accent-gold);
}

/* --- Bespoke Quiz View --- */
.quiz-progress-bar {
  height: 3px;
  background-color: var(--border-ink);
  width: 100%;
  margin-bottom: 2rem;
  position: relative;
}

.quiz-progress-fill {
  height: 100%;
  background-color: var(--accent-ink);
  width: 0%;
  transition: width 0.4s ease;
}

.quiz-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.quiz-level-indicator {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08rem;
  background-color: var(--accent-gold);
  color: #fff;
  padding: 0.2rem 0.6rem;
  font-weight: 600;
}

[data-theme="dark"] .quiz-level-indicator {
  color: var(--bg-color);
}

.quiz-step-count {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.quiz-question-text {
  font-size: 1.4rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-serif);
  line-height: 1.4;
}

.quiz-options-group {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
  margin-bottom: 2rem;
}

/* Custom styled ink options */
.quiz-option {
  display: flex;
  align-items: flex-start;
  padding: 1rem;
  border: 1px solid var(--border-ink);
  cursor: pointer;
  transition: var(--transition-fast);
  background-color: var(--bg-paper);
}

.quiz-option:hover {
  background-color: var(--bg-desk);
  border-color: var(--border-ink-focus);
}

.quiz-option.selected {
  border-color: var(--accent-ink);
  background-color: rgba(62, 92, 70, 0.03);
}

.quiz-option-radio {
  display: none;
}

.quiz-option-marker {
  width: 20px;
  height: 20px;
  border: 1.5px solid var(--border-ink-focus);
  border-radius: 50%;
  margin-right: 1rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
  margin-top: 2px;
}

.quiz-option.selected .quiz-option-marker {
  border-color: var(--accent-ink);
  background-color: var(--accent-ink);
}

.quiz-option.selected .quiz-option-marker::after {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--bg-paper);
}

.quiz-option-content {
  font-size: 0.95rem;
  color: var(--text-primary);
  line-height: 1.4;
}

/* Option validation animations and states */
.quiz-option.correct {
  border-color: var(--accent-ink) !important;
  background-color: rgba(62, 92, 70, 0.08) !important;
}

.quiz-option.correct .quiz-option-marker {
  background-color: var(--accent-ink) !important;
  border-color: var(--accent-ink) !important;
}

.quiz-option.incorrect {
  border-color: var(--accent-alert) !important;
  background-color: var(--accent-alert-light) !important;
}

.quiz-option.incorrect .quiz-option-marker {
  background-color: var(--accent-alert) !important;
  border-color: var(--accent-alert) !important;
}

.quiz-feedback {
  border-left: 2px solid var(--accent-ink);
  padding-left: 1.5rem;
  margin-bottom: 2rem;
  animation: slideDown 0.4s ease;
}

.quiz-feedback.incorrect {
  border-left-color: var(--accent-alert);
}

.quiz-feedback h5 {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05rem;
  color: var(--accent-ink);
  margin-bottom: 0.3rem;
}

.quiz-feedback.incorrect h5 {
  color: var(--accent-alert);
}

.quiz-feedback p {
  font-size: 0.95rem;
  line-height: 1.5;
  color: var(--text-primary);
}

/* Score recap leaf */
.score-recap {
  text-align: center;
  padding: 2rem 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.score-badge {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  border: 2px dashed var(--accent-gold);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.score-num {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  color: var(--accent-gold);
  font-weight: bold;
  line-height: 1;
}

.score-total {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.score-evaluation {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-style: italic;
  margin-bottom: 1rem;
}

.score-text {
  font-size: 0.95rem;
  max-width: 480px;
  margin-bottom: 2.5rem;
  text-align: center;
}

/* --- Footer --- */
.desk-footer {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-secondary);
  opacity: 0.7;
}

/* --- Animations --- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes sheetSlideUp {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes bookFlip {
  0% { transform: rotateY(0deg); }
  50% { transform: rotateY(-180deg); }
  100% { transform: rotateY(-360deg); }
}

/* --- Settings Modal --- */
.settings-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(43, 40, 35, 0.5);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  animation: fadeIn 0.2s ease;
}

[data-theme="dark"] .settings-overlay {
  background-color: rgba(0, 0, 0, 0.6);
}

.settings-panel {
  background-color: var(--bg-paper);
  border: 1px solid var(--border-ink);
  box-shadow: var(--shadow-desk);
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  overflow-y: auto;
  animation: sheetSlideUp 0.3s cubic-bezier(0.25, 1, 0.5, 1);
}

.settings-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--border-ink);
}

.settings-header h3 {
  font-size: 1.3rem;
}

.settings-body {
  padding: 2rem;
}

.settings-section h4 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.settings-desc {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text-secondary);
}

.settings-status {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* --- Mobile Responsiveness --- */
@media (max-width: 768px) {
  body {
    padding: 1rem 0.5rem;
  }
  
  .desk-container {
    padding: 2rem 1.5rem;
    margin-bottom: 1rem;
  }
  
  .desk-container::after {
    left: 8px;
  }
  
  .top-bar {
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 0.8rem;
  }

  .controls-ledger {
    gap: 0.6rem;
    flex-wrap: wrap;
  }
  
  .desk-intro h2 {
    font-size: 1.8rem;
  }
  
  .input-row {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
  
  .ledger-board {
    grid-template-columns: 1fr;
    gap: 0.8rem;
    margin-bottom: 2rem;
  }
  
  .content-sheet {
    padding: 1.5rem;
  }

  .settings-panel {
    max-width: 100%;
  }

  .settings-body {
    padding: 1.5rem;
  }
}