/* ===================================================================
   Signet LLM — Dark mission-control aesthetic
   =================================================================== */

/* System monospace stack — no external font load, instant render */

:root {
  --bg: #0a0a0f;
  --panel-bg: #12121a;
  --panel-border: rgba(255, 255, 255, 0.08);
  --blue: #4fc3f7;
  --blue-dim: rgba(79, 195, 247, 0.3);
  --blue-glow: rgba(79, 195, 247, 0.15);
  --amber: #ffb74d;
  --text: #e0e0e0;
  --text-dim: #666;
  --white: #ffffff;
  --radius: 8px;
}

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

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Cascadia Code', 'Fira Code', 'JetBrains Mono', 'SF Mono', 'Consolas', 'Liberation Mono', monospace;
  font-size: 13px;
  line-height: 1.5;
  max-width: 900px;
  margin: 0 auto;
  padding: 24px 16px;
}

/* ---- Header ---------------------------------------------------------- */

header {
  text-align: center;
  margin-bottom: 32px;
}

header h1 {
  font-size: 20px;
  font-weight: 300;
  letter-spacing: 6px;
  color: var(--white);
}

.subtitle {
  color: var(--text-dim);
  font-size: 12px;
  margin-top: 4px;
}

.intro {
  text-align: center;
  color: var(--text);
  font-size: 13px;
  font-weight: 300;
  margin-bottom: 20px;
  line-height: 1.6;
  opacity: 0.8;
}

/* ---- Panels ---------------------------------------------------------- */

.panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 16px;
}

.panel h2 {
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.panel-hint {
  font-weight: 300;
  text-transform: none;
  letter-spacing: 0;
  opacity: 0.5;
}

/* ---- Insights List --------------------------------------------------- */

.insights-list {
  margin-top: 10px;
  font-size: 11px;
  line-height: 1.7;
  color: var(--text-dim);
  min-height: 20px;
}

.insights-list .insight {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 3px 0;
  width: 100%;
}

.insights-list .insight-sub {
  padding-left: 12px;
  opacity: 0.7;
  font-size: 10px;
}

.insights-list .insight-bar {
  height: 3px;
  border-radius: 2px;
  background: var(--blue);
  flex-shrink: 0;
  transition: width 0.3s ease;
}

.insights-list .insight-text {
  white-space: normal;
  line-height: 1.6;
  flex: 1;
}

.insights-list .insight-text strong {
  color: var(--blue);
  font-weight: 500;
}

/* ---- Bigram Split Layout --------------------------------------------- */

.bigram-split {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  align-items: start;
}

.bigram-chart {
  width: 300px;
  flex-shrink: 0;
}

.bigram-chart canvas {
  display: block;
  width: 100%;
}

.bigram-sentences {
  font-size: 11px;
  line-height: 1.7;
  color: var(--text-dim);
  padding-top: 4px;
}

.bigram-sentences .insight {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 3px 0;
}

.bigram-sentences .insight-bar {
  height: 3px;
  border-radius: 2px;
  background: var(--blue);
  flex-shrink: 0;
  transition: width 0.3s ease;
}

.bigram-sentences .insight-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

@media (max-width: 768px) {
  .bigram-split {
    grid-template-columns: 1fr;
  }
  .bigram-chart {
    width: 100%;
  }
}

/* ---- Textarea -------------------------------------------------------- */

textarea {
  width: 100%;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--panel-border);
  border-radius: 4px;
  padding: 12px;
  font-family: inherit;
  font-size: 12px;
  resize: vertical;
  outline: none;
  transition: border-color 0.2s;
}

textarea:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 1px var(--blue-glow);
}

/* ---- Presets --------------------------------------------------------- */

.preset-row {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
}

.preset-btn {
  background: transparent;
  border: 1px solid var(--panel-border);
  color: var(--text-dim);
  padding: 4px 12px;
  border-radius: 4px;
  font-family: inherit;
  font-size: 11px;
  cursor: pointer;
  transition: all 0.2s;
}

.preset-btn:hover {
  border-color: var(--blue);
  color: var(--text);
}

.preset-btn.active {
  border-color: var(--blue);
  color: var(--blue);
  background: var(--blue-glow);
}

/* ---- Control Bar ----------------------------------------------------- */

.control-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 12px 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 12px;
}

.control-bar-left {
  display: flex;
  gap: 8px;
}

.control-bar-right {
  display: flex;
  gap: 20px;
  align-items: center;
}

.stat {
  font-size: 12px;
  color: var(--text-dim);
}

.stat strong {
  color: var(--white);
  font-weight: 500;
}

/* ---- Buttons --------------------------------------------------------- */

.btn {
  font-family: inherit;
  font-size: 12px;
  padding: 6px 16px;
  border-radius: 4px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--blue);
  color: var(--bg);
  font-weight: 500;
}

.btn-primary:hover {
  background: #81d4fa;
}

.btn-secondary {
  background: transparent;
  border-color: var(--panel-border);
  color: var(--text-dim);
}

.btn-secondary:hover {
  border-color: var(--text-dim);
  color: var(--text);
}

.hidden {
  display: none !important;
}

/* ---- Typewriter ------------------------------------------------------ */

#typewriter {
  max-height: 300px;
  overflow-y: auto;
  padding: 8px 0;
}

.typewriter-line {
  display: flex;
  gap: 16px;
  margin-bottom: 8px;
  align-items: flex-start;
}

.typewriter-step {
  color: var(--text-dim);
  font-size: 10px;
  min-width: 80px;
  padding-top: 2px;
  flex-shrink: 0;
}

.typewriter-text {
  word-break: break-all;
  line-height: 1.6;
}

.typewriter-char {
  transition: background 0.15s;
  cursor: default;
}

.typewriter-cursor {
  color: var(--blue);
  animation: blink 1s step-end infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

/* ---- Typewriter Milestones ------------------------------------------- */

.typewriter-milestone {
  padding: 6px 12px;
  margin: 8px 0;
  background: rgba(79, 195, 247, 0.08);
  border-left: 3px solid var(--blue);
  border-radius: 0 4px 4px 0;
  font-size: 11px;
  color: var(--blue);
  line-height: 1.5;
}

/* ---- Two Column Layout ----------------------------------------------- */

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

@media (max-width: 768px) {
  .two-col {
    grid-template-columns: 1fr;
  }
}

.panel canvas {
  display: block;
  width: 100%;
  touch-action: pan-y; /* allow vertical scroll, prevent horizontal gesture interference */
}

/* ---- Entropy Label --------------------------------------------------- */

.entropy-label {
  font-size: 11px;
  margin-top: 8px;
  color: var(--text-dim);
  transition: color 0.3s;
}

/* ---- Controls Grid --------------------------------------------------- */

.controls-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 16px;
}

@media (max-width: 768px) {
  .controls-grid {
    grid-template-columns: 1fr;
  }
}

.control-group {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  padding: 16px;
}

.control-group h3 {
  font-size: 10px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-dim);
  margin-bottom: 12px;
}

.control-group .hint {
  font-weight: 300;
  opacity: 0.5;
}

.control-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.control-row label {
  font-size: 12px;
  color: var(--text-dim);
  min-width: 90px;
}

/* ---- Toggle Buttons -------------------------------------------------- */

.toggle-group {
  display: flex;
  gap: 4px;
}

.toggle-btn {
  background: transparent;
  border: 1px solid var(--panel-border);
  color: var(--text-dim);
  padding: 3px 12px;
  border-radius: 3px;
  font-family: inherit;
  font-size: 11px;
  cursor: pointer;
  transition: all 0.2s;
}

.toggle-btn:hover {
  border-color: var(--blue);
  color: var(--text);
}

.toggle-btn.active {
  border-color: var(--blue);
  color: var(--blue);
  background: var(--blue-glow);
}

/* ---- Sliders --------------------------------------------------------- */

input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  height: 4px;
  background: var(--panel-border);
  border-radius: 2px;
  outline: none;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--blue);
  cursor: pointer;
  border: none;
}

input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--blue);
  cursor: pointer;
  border: none;
}

.slider-value {
  font-size: 11px;
  color: var(--text-dim);
  min-width: 40px;
  text-align: right;
}

/* ---- Info Tooltips --------------------------------------------------- */

.info-tip {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  border: 1px solid var(--text-dim);
  color: var(--text-dim);
  font-size: 9px;
  font-weight: 500;
  cursor: help;
  margin-left: 6px;
  vertical-align: middle;
  flex-shrink: 0;
  text-transform: none;
  letter-spacing: 0;
  line-height: 1;
  transition: all 0.2s;
}

.info-tip:hover {
  border-color: var(--blue);
  color: var(--blue);
}

.info-tip .info-content {
  display: none;
  position: absolute;
  left: 50%;
  top: calc(100% + 8px);
  transform: translateX(-50%);
  width: 280px;
  background: #1a1a28;
  border: 1px solid var(--panel-border);
  border-radius: 6px;
  padding: 12px;
  font-size: 11px;
  font-weight: 300;
  line-height: 1.6;
  color: var(--text);
  text-transform: none;
  letter-spacing: 0;
  white-space: normal;
  z-index: 100;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
  pointer-events: none;
}

.info-tip .info-content::before {
  content: '';
  position: absolute;
  top: -5px;
  left: 50%;
  transform: translateX(-50%);
  width: 8px;
  height: 8px;
  background: #1a1a28;
  border-left: 1px solid var(--panel-border);
  border-top: 1px solid var(--panel-border);
  transform: translateX(-50%) rotate(45deg);
}

.info-tip:hover .info-content {
  display: block;
}

/* Flip tooltip above when near bottom of viewport */
.info-tip.tip-above .info-content {
  top: auto;
  bottom: calc(100% + 8px);
}

.info-tip.tip-above .info-content::before {
  top: auto;
  bottom: -5px;
  transform: translateX(-50%) rotate(225deg);
}

/* Align right-edge tooltips so they don't overflow */
.info-tip.tip-left .info-content {
  left: auto;
  right: -8px;
  transform: none;
}

.info-tip.tip-left .info-content::before {
  left: auto;
  right: 12px;
  transform: rotate(45deg);
}

/* ---- Footer ---------------------------------------------------------- */

footer {
  text-align: center;
  padding: 24px 0;
  color: var(--text-dim);
  font-size: 11px;
}

.footer-brand {
  margin-top: 6px;
  font-size: 11px;
}

.footer-brand a {
  color: var(--text-dim);
  text-decoration: none;
  transition: opacity 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.footer-brand a:hover {
  color: var(--text);
}

.footer-logo {
  width: 20px;
  height: 20px;
  vertical-align: middle;
  opacity: 0.7;
  transition: opacity 0.2s;
}

.footer-brand a:hover .footer-logo {
  opacity: 1;
}

/* ---- Scrollbar ------------------------------------------------------- */

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--panel-border);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-dim);
}

/* ==================================================================
   Mobile responsive — 480px and below
   ================================================================== */

@media (max-width: 480px) {
  body {
    padding: 12px 8px;
    font-size: 12px;
  }

  header {
    margin-bottom: 20px;
  }

  header h1 {
    font-size: 16px;
    letter-spacing: 4px;
  }

  .subtitle {
    font-size: 11px;
  }

  .intro {
    font-size: 12px;
    margin-bottom: 14px;
  }

  /* Panels: tighter padding */
  .panel {
    padding: 12px;
    margin-bottom: 12px;
  }

  /* Control bar: stack vertically */
  .control-bar {
    flex-direction: column;
    align-items: stretch;
    padding: 10px 12px;
    gap: 8px;
  }

  .control-bar-left {
    justify-content: center;
  }

  .control-bar-right {
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
  }

  .stat {
    font-size: 11px;
  }

  /* Control rows: stack label above input on very small screens */
  .control-row {
    flex-wrap: wrap;
    gap: 6px;
  }

  .control-row label {
    min-width: 70px;
    font-size: 11px;
  }

  /* Toggle buttons: smaller padding */
  .toggle-btn {
    padding: 4px 8px;
    font-size: 10px;
  }

  /* Sliders: larger touch target */
  input[type="range"]::-webkit-slider-thumb {
    width: 20px;
    height: 20px;
  }

  input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
  }

  /* Buttons: bigger touch targets */
  .btn {
    padding: 10px 18px;
    font-size: 13px;
  }

  /* Typewriter: stack step label above text */
  .typewriter-line {
    flex-direction: column;
    gap: 4px;
  }

  .typewriter-step {
    min-width: unset;
  }

  .typewriter-text {
    font-size: 12px;
  }

  /* Presets: full-width buttons */
  .preset-row {
    gap: 6px;
  }

  .preset-btn {
    flex: 1 1 auto;
    text-align: center;
    padding: 6px 8px;
  }

  /* Tooltips: constrain to viewport */
  .info-tip .info-content {
    width: 220px;
    font-size: 10px;
    padding: 10px;
  }

  /* Left-align all tooltips on mobile so they don't overflow */
  .info-tip .info-content {
    left: -8px;
    transform: none;
  }

  .info-tip .info-content::before {
    left: 16px;
    transform: rotate(45deg);
  }

  .info-tip.tip-left .info-content {
    left: auto;
    right: -8px;
  }

  .info-tip.tip-left .info-content::before {
    left: auto;
    right: 16px;
  }

  /* Bigram sentences: allow wrapping */
  .bigram-sentences .insight-text {
    white-space: normal;
  }

  /* Milestones */
  .typewriter-milestone {
    font-size: 10px;
    padding: 5px 10px;
  }

  /* Textarea */
  textarea {
    font-size: 11px;
    padding: 10px;
    rows: 4;
  }
}

/* ==================================================================
   Tablet breakpoint — 768px and below
   (supplements the existing grid collapses)
   ================================================================== */

@media (max-width: 768px) {
  body {
    padding: 16px 12px;
  }

  .panel {
    padding: 14px;
  }

  /* Control bar right: allow wrapping */
  .control-bar-right {
    flex-wrap: wrap;
  }

  /* Bigram sentences: allow wrapping */
  .bigram-sentences .insight-text {
    white-space: normal;
  }

  /* Tooltips: slightly narrower */
  .info-tip .info-content {
    width: 250px;
  }

  /* Slider touch targets: slightly bigger */
  input[type="range"]::-webkit-slider-thumb {
    width: 18px;
    height: 18px;
  }

  input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
  }
}