/* ═══════════════════════════════════════════════════════════════
   TOKENIZATION LAB — page-specific styles
   Inherits typography + color tokens from main.css.
   Visual direction: mechanical typewriter. Token pills as physical
   pieces, merge history as a ledger, precise mono readouts.
   ═══════════════════════════════════════════════════════════════ */

.tk-main { background: var(--paper); color: var(--ink); }

/* ── Hero ─────────────────────────────────────────────────────── */
.tk-hero { padding: 140px 48px 64px; max-width: 1080px; }
.tk-title { margin-top: 18px; }
.tk-kicker {
  margin-top: 32px; max-width: 720px;
  font-size: 17px; line-height: 1.55; color: var(--ink-soft);
}
.tk-dateline {
  margin-top: 48px;
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px;
  max-width: 720px;
  font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-dim);
}
.tk-dateline .label { color: var(--ink-dim); margin-bottom: 4px; }
.tk-dateline .value {
  color: var(--ink); text-transform: none;
  letter-spacing: 0.02em; font-size: 13px;
}

/* ── Generic section ─────────────────────────────────────────── */
.tk-section { padding: 64px 48px; max-width: 1200px; }
.tk-section .section-label { margin-bottom: 24px; }
.tk-prose { max-width: 720px; }
.tk-prose p + p { margin-top: 20px; }
.tk-lede {
  font-family: "Newsreader", Georgia, serif;
  font-style: italic;
  font-size: 22px !important;
  line-height: 1.4 !important;
  color: var(--ink) !important;
}
.tk-note { max-width: 720px; font-size: 15px; color: var(--ink-soft); margin-bottom: 28px; }

/* ── Demo: two-column tokenizer ──────────────────────────────── */
.tk-demo-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 1fr);
  gap: 40px;
  align-items: start;
}

/* Left panel */
.tk-input-panel {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.tk-field { display: flex; flex-direction: column; gap: 6px; }
.field-label {
  font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-dim);
}
.tk-textarea {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid var(--ink);
  background: var(--paper-2);
  color: var(--ink);
  font-family: "DM Mono", monospace;
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.02em;
  resize: vertical;
  outline: none;
}
.tk-textarea:focus {
  border-color: var(--accent);
}

.tk-controls {
  display: flex; align-items: center; gap: 10px;
}
.tk-ctl-btn {
  background: transparent;
  border: 1px solid var(--ink);
  color: var(--ink);
  padding: 8px 16px;
  font-family: "DM Mono", monospace;
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 180ms, color 180ms, opacity 180ms;
}
.tk-ctl-btn:hover:not(:disabled) {
  background: var(--ink);
  color: var(--paper);
}
.tk-ctl-btn:disabled {
  opacity: 0.35; cursor: not-allowed;
}
.tk-ctl-btn.primary {
  background: var(--ink); color: var(--paper);
}
.tk-ctl-btn.primary:hover:not(:disabled) {
  background: var(--accent); border-color: var(--accent); color: var(--paper);
}
.tk-ctl-btn.active {
  background: var(--accent); border-color: var(--accent); color: var(--paper);
}

.field-row { display: flex; align-items: center; gap: 14px; }
.field-row input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 2px;
  background: var(--ink-dim);
  outline: none;
  cursor: pointer;
}
.field-row input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px; height: 14px;
  background: var(--accent);
  border-radius: 0;
  cursor: pointer;
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--accent);
}
.field-row input[type="range"]::-moz-range-thumb {
  width: 14px; height: 14px;
  background: var(--accent);
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 1px var(--accent);
  border-radius: 0;
  cursor: pointer;
}
.field-val {
  font-size: 13px;
  min-width: 48px;
  text-align: right;
  color: var(--ink);
  letter-spacing: 0.04em;
}
.tk-slider-labels {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  color: var(--ink-dim);
  letter-spacing: 0.08em;
  padding: 0 2px;
  margin-top: 2px;
}

.tk-merge-status {
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-dim);
  padding-top: 8px;
  border-top: 1px solid var(--rule);
}

/* Right panel */
.tk-output-panel {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.tk-panel-head {
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  border-bottom: 1px solid var(--ink-dim);
  padding-bottom: 8px;
  margin-bottom: 12px;
}

/* Token stream */
.tk-token-wrap {
  border: 1px solid var(--ink);
  padding: 18px 18px 14px;
  background: var(--paper);
}
.tk-token-stream {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  max-height: 260px;
  overflow-y: auto;
  align-content: flex-start;
}
.tk-token-empty {
  width: 100%;
  text-align: center;
  padding: 30px 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

/* Token pills */
.tk-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: 1px solid var(--ink-dim);
  font-family: "DM Mono", monospace;
  font-size: 12px;
  line-height: 1.3;
  letter-spacing: 0.02em;
  color: var(--ink);
  background: var(--paper-2);
  cursor: default;
  user-select: none;
  transition: border-color 200ms, background 200ms, transform 200ms;
  word-break: break-all;
}
.tk-pill.byte {
  border-color: color-mix(in oklab, var(--ink-dim) 50%, transparent);
  color: var(--ink-soft);
  background: color-mix(in oklab, var(--ink) 4%, transparent);
}
.tk-pill.new {
  border-color: var(--accent);
  background: color-mix(in oklab, var(--accent) 12%, var(--paper-2));
  color: var(--ink);
  animation: tk-pulse 600ms ease-out;
}
.tk-pill-id {
  font-size: 9px;
  color: var(--ink-dim);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

@keyframes tk-pulse {
  0% { transform: scale(1); }
  30% { transform: scale(1.08); }
  100% { transform: scale(1); }
}

/* Merge history */
.tk-history-wrap {
  border: 1px solid var(--ink);
  padding: 18px 18px 14px;
  background: var(--paper);
}
.tk-history-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-height: 180px;
  overflow-y: auto;
}
.tk-history-list li {
  display: grid;
  grid-template-columns: 60px 1fr 50px;
  gap: 10px;
  align-items: baseline;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  padding: 4px 0;
  border-bottom: 1px dotted var(--ink-dim);
}
.tk-history-list li:last-child {
  border-bottom: none;
}
.tk-history-list .h-id {
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  font-weight: 500;
}
.tk-history-list .h-pair {
  color: var(--ink);
  font-family: "Newsreader", Georgia, serif;
  font-style: italic;
  font-size: 13px;
}
.tk-history-list .h-count {
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--ink-dim);
  font-size: 11px;
}
.tk-history-empty {
  color: var(--ink-dim) !important;
  border-bottom: none !important;
  display: block !important;
  padding: 10px 0 !important;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 10px !important;
}

/* Stats bar */
.tk-stats-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border: 1px solid var(--ink);
}
.tk-stat {
  padding: 16px 18px;
  border-right: 1px solid var(--ink);
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.tk-stat:last-child { border-right: none; }
.tk-stat-label {
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.tk-stat-value {
  font-family: "Newsreader", Georgia, serif;
  font-size: 28px;
  font-weight: 300;
  letter-spacing: -0.01em;
  line-height: 1.1;
  color: var(--ink);
  font-variant-numeric: tabular-nums;
}

/* ── How it works grid ──────────────────────────────────────── */
.tk-how-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 12px;
}
.tk-how-card {
  border-top: 1px solid var(--ink);
  padding-top: 18px;
}
.tk-how-fig {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.tk-how-title {
  font-size: 26px;
  line-height: 1.15;
  letter-spacing: -0.015em;
  font-weight: 400;
  margin: 0 0 12px;
}
.tk-how-card p {
  font-size: 15px;
  line-height: 1.55;
  color: var(--ink-soft);
}

/* ── Edge cases grid ────────────────────────────────────────── */
.tk-edge-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--ink);
  margin-top: 16px;
}
.tk-edge-card {
  padding: 22px 20px;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  display: flex;
  flex-direction: column;
  gap: 8px;
  cursor: pointer;
  transition: background 180ms ease;
}
.tk-edge-card:nth-child(3n) { border-right: none; }
.tk-edge-card:nth-last-child(-n+3) { border-bottom: none; }
.tk-edge-card:hover {
  background: var(--paper-2);
}
.tk-edge-fig {
  font-family: "DM Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.tk-edge-input {
  font-size: 18px;
  color: var(--ink);
  letter-spacing: 0.04em;
  word-break: break-all;
}
.tk-edge-tokens {
  font-size: 12px;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.06em;
}
.tk-edge-note {
  font-size: 14px;
  line-height: 1.45;
  color: var(--ink-soft);
  margin-top: 4px;
}

/* ── Receipts grid ──────────────────────────────────────────── */
.tk-receipts {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0;
  border: 1px solid var(--ink);
  margin-top: 16px;
}
.tk-receipt {
  padding: 22px 20px;
  border-right: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}
.tk-receipt:nth-child(5n) { border-right: none; }
.tk-receipt:nth-last-child(-n+5) { border-bottom: none; }
.tk-receipt-label {
  font-family: "DM Mono", monospace;
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-dim);
  margin-bottom: 8px;
}
.tk-receipt-value {
  font-family: "Newsreader", Georgia, serif;
  font-size: 32px;
  line-height: 1;
  color: var(--ink);
}

.tk-colophon-section { padding-bottom: 80px; }

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 900px) {
  .tk-hero, .tk-section { padding-left: 24px; padding-right: 24px; }
  .tk-demo-layout { grid-template-columns: 1fr; }
  .tk-dateline { grid-template-columns: 1fr; gap: 16px; }
  .tk-how-grid { grid-template-columns: 1fr; gap: 24px; }
  .tk-edge-grid { grid-template-columns: 1fr; }
  .tk-edge-card { border-right: none; }
  .tk-edge-card:nth-last-child(-n+3) { border-bottom: 1px solid var(--ink); }
  .tk-edge-card:last-child { border-bottom: none; }
  .tk-receipts { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .tk-receipt:nth-child(5n) { border-right: 1px solid var(--ink); }
  .tk-receipt:nth-child(2n) { border-right: none; }
  .tk-stats-bar { grid-template-columns: 1fr; }
  .tk-stat { border-right: none; border-bottom: 1px solid var(--ink); }
  .tk-stat:last-child { border-bottom: none; }
}

@media (max-width: 540px) {
  .tk-receipts { grid-template-columns: 1fr; }
  .tk-receipt { border-right: none; }
}