/* Letter Sorting Table — Complete Design System */

/* ==========================================
   RESET & BASE
   ========================================== */

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

:root {
  /* Colors */
  --bg-warm-paper: #f4f1ed;
  --text-charcoal: #2a2a2a;
  --accent-ink-blue: #2d4a6e;
  --accent-burnt-orange: #c47842;
  --tile-bone: #f9f7f4;
  --line-graphite: #b8b5b0;
  --success-green: #4a6b47;
  --error-brick: #a64d3a;
  --border-light: #e0ddd8;
  
  /* Typography */
  --font-mono: "SF Mono", Monaco, "Cascadia Code", Consolas, "Courier New", monospace;
  --font-serif: Georgia, Cambria, "Times New Roman", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  
  /* Layout */
  --max-width: 1180px;
  --reading-width: 720px;
  --spacing: 8px;
}

body {
  background: var(--bg-warm-paper);
  color: var(--text-charcoal);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  position: relative;
}

/* Subtle background pattern */
body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 48px,
      rgba(0, 0, 0, 0.008) 48px,
      rgba(0, 0, 0, 0.008) 49px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 119px,
      rgba(0, 0, 0, 0.006) 119px,
      rgba(0, 0, 0, 0.006) 120px
    );
  pointer-events: none;
  z-index: 0;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.reading-width {
  max-width: var(--reading-width);
  margin: 0 auto;
}

/* ==========================================
   UTILITY MASTHEAD
   ========================================== */

.masthead {
  height: 57px;
  border-bottom: 1px solid var(--line-graphite);
  background: var(--bg-warm-paper);
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
}

.masthead-inner {
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.masthead-logo {
  font-family: var(--font-serif);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-charcoal);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.masthead-nav {
  display: flex;
  gap: 32px;
  align-items: center;
}

.masthead-nav a {
  color: var(--text-charcoal);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.masthead-nav a:hover {
  color: var(--accent-ink-blue);
}

.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-charcoal);
}

/* ==========================================
   TYPOGRAPHY
   ========================================== */

h1 {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

h2 {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

h3 {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
}

h4 {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

p {
  margin-bottom: 16px;
}

.label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-ink-blue);
}

/* ==========================================
   MAIN LETTER TRAY
   ========================================== */

.letter-tray {
  padding: 80px 0 60px;
}

.tray-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 64px;
  align-items: start;
}

.tray-main .label {
  display: block;
  margin-bottom: 16px;
}

.tray-intro {
  font-size: 17px;
  line-height: 1.6;
  color: var(--text-charcoal);
  margin-bottom: 32px;
  max-width: 600px;
}

.input-group {
  margin-bottom: 24px;
}

.input-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-charcoal);
}

.letter-input {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 32px;
  padding: 16px 20px;
  border: 2px solid var(--line-graphite);
  background: white;
  color: var(--text-charcoal);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.letter-input:focus {
  outline: none;
  border-color: var(--accent-ink-blue);
}

.button-group {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}

.btn {
  background: var(--text-charcoal);
  color: white;
  border: none;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: all 0.2s;
  font-family: var(--font-sans);
}

.btn:hover {
  background: var(--accent-ink-blue);
}

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

.btn-secondary {
  background: white;
  color: var(--text-charcoal);
  border: 2px solid var(--line-graphite);
}

.btn-secondary:hover {
  background: var(--tile-bone);
  border-color: var(--text-charcoal);
}

.example-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.example-links span {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-ink-blue);
  margin-right: 8px;
}

.example-link {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--accent-burnt-orange);
  text-decoration: none;
  padding: 6px 12px;
  border: 1px solid var(--border-light);
  background: white;
  cursor: pointer;
  transition: all 0.2s;
}

.example-link:hover {
  border-color: var(--accent-burnt-orange);
  background: var(--tile-bone);
}

/* Quick Settings */
.quick-settings {
  background: white;
  border: 1px solid var(--line-graphite);
  padding: 24px;
}

.quick-settings h4 {
  margin-bottom: 20px;
}

.setting-group {
  margin-bottom: 20px;
}

.setting-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-charcoal);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.setting-options {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.option-btn {
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  background: var(--tile-bone);
  border: 1px solid var(--border-light);
  color: var(--text-charcoal);
  cursor: pointer;
  transition: all 0.2s;
  font-family: var(--font-mono);
}

.option-btn:hover {
  border-color: var(--accent-ink-blue);
}

.option-btn.active {
  background: var(--accent-ink-blue);
  color: white;
  border-color: var(--accent-ink-blue);
}

.setting-input {
  width: 100%;
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  border: 1px solid var(--line-graphite);
  background: white;
  text-transform: uppercase;
}

.setting-input:focus {
  outline: none;
  border-color: var(--accent-ink-blue);
}

/* ==========================================
   WORD RESULT LEDGER
   ========================================== */

.result-ledger {
  padding: 60px 0;
  display: none;
}

.result-ledger.visible {
  display: block;
}

.result-header {
  margin-bottom: 32px;
}

.result-header h2 {
  margin-bottom: 8px;
}

.result-summary {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--accent-ink-blue);
  font-weight: 600;
}

.result-table {
  background: white;
  border: 1px solid var(--line-graphite);
  overflow-x: auto;
}

.result-table table {
  width: 100%;
  border-collapse: collapse;
}

.result-table th {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 16px 20px;
  text-align: left;
  background: var(--tile-bone);
  border-bottom: 1px solid var(--line-graphite);
  color: var(--text-charcoal);
}

.result-table td {
  font-family: var(--font-mono);
  font-size: 15px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--border-light);
}

.result-table tr:last-child td {
  border-bottom: none;
}

.result-table tr:hover {
  background: var(--tile-bone);
}

.word-cell {
  font-weight: 600;
  color: var(--text-charcoal);
}

.length-cell {
  color: var(--accent-ink-blue);
}

.letters-cell {
  color: var(--line-graphite);
  letter-spacing: 0.1em;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 80px 40px;
  color: var(--line-graphite);
}

.empty-state p {
  font-size: 16px;
  margin-bottom: 8px;
}

/* Error State */
.error-state {
  background: #fef5f4;
  border: 1px solid var(--error-brick);
  padding: 16px 20px;
  margin-bottom: 24px;
  color: var(--error-brick);
  font-size: 14px;
  font-weight: 600;
  display: none;
}

.error-state.visible {
  display: block;
}

/* ==========================================
   RESULT REFINEMENT RAIL
   ========================================== */

.refinement-rail {
  padding: 24px 0;
  border-bottom: 1px solid var(--border-light);
  margin-bottom: 32px;
  display: none;
}

.refinement-rail.visible {
  display: block;
}

.rail-section {
  margin-bottom: 16px;
}

.rail-section:last-child {
  margin-bottom: 0;
}

.rail-label {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
  color: var(--text-charcoal);
}

.rail-options {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* ==========================================
   LETTER BREAKDOWN
   ========================================== */

.letter-breakdown {
  padding: 60px 0;
  border-top: 2px solid var(--line-graphite);
  display: none;
}

.letter-breakdown.visible {
  display: block;
}

.letter-breakdown h2 {
  margin-bottom: 32px;
}

.letter-tiles {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.letter-tile {
  background: var(--tile-bone);
  border: 2px solid var(--line-graphite);
  padding: 20px 24px;
  text-align: center;
  min-width: 80px;
}

.tile-letter {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  color: var(--text-charcoal);
  display: block;
  margin-bottom: 4px;
}

.tile-count {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-ink-blue);
  font-weight: 600;
}

.letter-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 600px;
}

.stat-item {
  text-align: center;
  padding: 16px;
  background: white;
  border: 1px solid var(--border-light);
}

.stat-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-ink-blue);
  margin-bottom: 8px;
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-charcoal);
}

/* ==========================================
   TODAY'S SCRAMBLE
   ========================================== */

.daily-scramble {
  padding: 60px 0;
  border-top: 2px solid var(--line-graphite);
}

.scramble-content {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.scramble-content h2 {
  margin-bottom: 40px;
}

.scrambled-letters {
  font-family: var(--font-mono);
  font-size: 56px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--accent-ink-blue);
  margin-bottom: 32px;
}

.scramble-instruction {
  font-size: 16px;
  margin-bottom: 32px;
  color: var(--text-charcoal);
}

.scramble-input-group {
  margin-bottom: 20px;
}

.scramble-input {
  width: 100%;
  max-width: 400px;
  font-family: var(--font-mono);
  font-size: 24px;
  padding: 16px 20px;
  border: 2px solid var(--line-graphite);
  background: white;
  text-align: center;
  text-transform: uppercase;
}

.scramble-input:focus {
  outline: none;
  border-color: var(--accent-ink-blue);
}

.scramble-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-bottom: 24px;
}

.scramble-feedback {
  min-height: 40px;
  padding: 12px 20px;
  margin-bottom: 16px;
  font-size: 15px;
  font-weight: 600;
  display: none;
}

.scramble-feedback.visible {
  display: block;
}

.scramble-feedback.correct {
  background: #f0f7f0;
  color: var(--success-green);
  border: 1px solid var(--success-green);
}

.scramble-feedback.incorrect {
  background: #fef5f4;
  color: var(--error-brick);
  border: 1px solid var(--error-brick);
}

.scramble-hint {
  font-size: 14px;
  color: var(--accent-ink-blue);
  font-style: italic;
  display: none;
}

.scramble-hint.visible {
  display: block;
}

/* ==========================================
   WORD LENGTH STAIRCASE
   ========================================== */

.length-staircase {
  padding: 60px 0;
  border-top: 2px solid var(--line-graphite);
  display: none;
}

.length-staircase.visible {
  display: block;
}

.length-staircase h2 {
  margin-bottom: 40px;
}

.staircase-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stair-step {
  background: white;
  border: 1px solid var(--line-graphite);
  padding: 20px 24px;
}

.step-header {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent-ink-blue);
  margin-bottom: 12px;
}

.step-words {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.step-word {
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--text-charcoal);
  font-weight: 600;
}

/* ==========================================
   COMMON LETTER PATTERNS
   ========================================== */

.letter-patterns {
  padding: 60px 0;
  border-top: 2px solid var(--line-graphite);
}

.letter-patterns h2 {
  margin-bottom: 40px;
}

.pattern-table {
  background: white;
  border: 1px solid var(--line-graphite);
  overflow-x: auto;
}

.pattern-table table {
  width: 100%;
  border-collapse: collapse;
}

.pattern-table th {
  font-size: 12px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 16px 20px;
  text-align: left;
  background: var(--tile-bone);
  border-bottom: 1px solid var(--line-graphite);
}

.pattern-table td {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border-light);
  font-size: 15px;
  line-height: 1.6;
}

.pattern-table tr:last-child td {
  border-bottom: none;
}

.pattern-cell {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-ink-blue);
}

/* ==========================================
   MINI SCRAMBLES
   ========================================== */

.mini-scrambles {
  padding: 60px 0;
  border-top: 2px solid var(--line-graphite);
}

.mini-scrambles h2 {
  margin-bottom: 40px;
}

.mini-list {
  max-width: 600px;
  margin: 0 auto;
}

.mini-item {
  display: grid;
  grid-template-columns: 40px 1fr 100px;
  gap: 20px;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-light);
}

.mini-number {
  font-family: var(--font-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--accent-ink-blue);
}

.mini-letters {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--text-charcoal);
}

.mini-check {
  padding: 8px 16px;
  font-size: 12px;
}

.mini-answer-input {
  grid-column: 2;
  width: 100%;
  font-family: var(--font-mono);
  font-size: 16px;
  padding: 10px 12px;
  border: 1px solid var(--line-graphite);
  text-transform: uppercase;
  display: none;
}

.mini-answer-input.visible {
  display: block;
}

.mini-feedback {
  grid-column: 2 / -1;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 12px;
  display: none;
}

.mini-feedback.visible {
  display: block;
}

.mini-feedback.correct {
  background: #f0f7f0;
  color: var(--success-green);
}

.mini-feedback.incorrect {
  background: #fef5f4;
  color: var(--error-brick);
}

/* ==========================================
   SECTION LINKS
   ========================================== */

.section-links {
  padding: 60px 0;
  border-top: 2px solid var(--line-graphite);
}

.section-links h2 {
  margin-bottom: 32px;
}

.link-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.link-item {
  background: white;
  border: 1px solid var(--line-graphite);
  padding: 20px 24px;
  text-decoration: none;
  color: var(--text-charcoal);
  transition: all 0.2s;
  display: block;
}

.link-item:hover {
  border-color: var(--accent-ink-blue);
  background: var(--tile-bone);
}

.link-item h3 {
  font-size: 18px;
  margin-bottom: 8px;
  color: var(--accent-ink-blue);
}

.link-item p {
  font-size: 14px;
  margin-bottom: 0;
  color: var(--text-charcoal);
}

/* ==========================================
   FOOTER
   ========================================== */

.footer {
  border-top: 2px solid var(--line-graphite);
  padding: 60px 0;
  margin-top: 80px;
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.footer-identity {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 32px;
  color: var(--text-charcoal);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  margin-bottom: 32px;
}

.footer-nav a {
  color: var(--text-charcoal);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.2s;
}

.footer-nav a:hover {
  color: var(--accent-ink-blue);
}

.footer-contact {
  font-size: 14px;
  color: var(--text-charcoal);
}

.footer-contact p {
  margin-bottom: 8px;
}

.footer-contact a {
  color: var(--accent-burnt-orange);
  text-decoration: none;
  font-weight: 600;
}

.footer-contact a:hover {
  text-decoration: underline;
}

/* ==========================================
   MOBILE RESPONSIVE
   ========================================== */

@media (max-width: 760px) {
  h1 {
    font-size: 36px;
  }
  
  h2 {
    font-size: 28px;
  }
  
  .masthead-nav {
    display: none;
    position: absolute;
    top: 57px;
    left: 0;
    right: 0;
    background: var(--bg-warm-paper);
    flex-direction: column;
    padding: 24px;
    border-bottom: 1px solid var(--line-graphite);
    gap: 16px;
  }
  
  .masthead-nav.mobile-open {
    display: flex;
  }
  
  .mobile-menu-toggle {
    display: block;
  }
  
  .tray-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .letter-input {
    font-size: 24px;
  }
  
  .scrambled-letters {
    font-size: 36px;
  }
  
  .letter-tiles {
    gap: 8px;
  }
  
  .letter-tile {
    min-width: 60px;
    padding: 16px 20px;
  }
  
  .tile-letter {
    font-size: 24px;
  }
  
  .result-table {
    font-size: 13px;
  }
  
  .link-grid {
    grid-template-columns: 1fr;
  }
  
  .footer-nav {
    flex-direction: column;
    gap: 12px;
  }
}

/* ==========================================
   UTILITY CLASSES
   ========================================== */

.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.mb-0 {
  margin-bottom: 0 !important;
}