* { box-sizing: border-box; }
body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  color: var(--ink);
  background: var(--paper);
  font-family: var(--font-sans);
}
button, select, textarea { font: inherit; }
button { color: inherit; }

/* ─── Header ─── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  width: 100%;
  background: var(--paper);
  border-bottom: 1px solid var(--line-2);
}
.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1100px;
  margin: 0 auto;
  padding: 8px 30px;
}
.brand { display: flex; align-items: center; gap: 0; color: inherit; text-decoration: none; }
.brand-mark { width: 64px; height: 64px; display: block; margin-right: -6px; }
.brand-word { font-family: var(--font-display); font-weight: 700; font-size: 22px; letter-spacing: -0.02em; color: var(--ink); }
.brand small { margin-left: 8px; color: var(--ink-3); font-size: 0.7rem; font-weight: 500; }
.local-badge { display: flex; gap: 8px; align-items: center; color: var(--ink-2); font-family: var(--font-mono); font-size: 0.72rem; font-weight: 500; text-transform: uppercase; letter-spacing: 0.06em; }
.status-dot { width: 8px; height: 8px; background: var(--green); border-radius: 50%; box-shadow: 0 0 0 4px color-mix(in srgb, var(--green) 15%, transparent); }

main { width: min(1040px, calc(100% - 60px)); margin: 0 auto; padding: 44px 0 70px; }

/* ─── Page header (required scheme) ─── */
.intro { max-width: 100%; margin-bottom: 40px; padding-bottom: 36px; text-align: left; border-bottom: 1px solid var(--line-2); }
h1, h2, h3, p { margin-top: 0; }
h1 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.3rem, 5vw, 3.3rem);
  letter-spacing: -0.025em;
  line-height: 1.05;
  color: var(--ink);
}
.lede { max-width: none; margin: 0; color: var(--ink-2); font-size: 1.15rem; line-height: 1.6; }

.workspace { display: grid; grid-template-columns: minmax(0, 1.65fr) minmax(280px, 0.75fr); overflow: hidden; min-height: 500px; background: var(--surface); border: 1px solid var(--line-2); border-radius: var(--r-xl); box-shadow: var(--shadow-sm); }
.editor-panel { display: flex; min-width: 0; flex-direction: column; border-right: 1px solid var(--line); }
.panel-toolbar, .editor-footer { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 16px 18px; }
.panel-toolbar { background: var(--paper-2); border-bottom: 1px solid var(--line); }
.model-field { display: flex; min-width: 0; gap: 9px; align-items: center; color: var(--ink); font-family: var(--font-mono); font-size: 12px; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase; }
.model-field select { width: min(250px, 34vw); padding: 8px 10px; color: var(--ink); background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--r-xs); font-family: var(--font-mono); font-size: 0.77rem; letter-spacing: 0; text-transform: none; }
.model-field select:focus-visible { outline: 3px solid transparent; outline-offset: 2px; box-shadow: var(--focus-ring); }
.toolbar-actions, .count-actions { display: flex; gap: 8px; align-items: center; }
.button { padding: 9px 13px; border: 0; border-radius: var(--r-pill); cursor: pointer; font-family: var(--font-display); font-size: 0.82rem; font-weight: 600; }
.button:focus-visible { outline: 3px solid transparent; outline-offset: 2px; box-shadow: var(--focus-ring); }
.button-quiet { color: var(--ink); background: transparent; border: 1px solid var(--line-strong); }
.button-quiet:hover { color: var(--ink); background: var(--paper-2); }
.button-primary { min-width: 116px; padding: 11px 16px; color: var(--on-primary); background: var(--yellow); box-shadow: var(--shadow-primary); }
.button-primary:hover { background: var(--yellow-600); }
.button-primary:disabled { cursor: wait; opacity: 0.62; }
.button-add { color: var(--ink); background: transparent; border: 1px solid var(--line-strong); }
.button-add:hover:not(:disabled) { background: var(--paper-2); }
.button-add:disabled { cursor: not-allowed; opacity: 0.5; }

.editor-wrap { position: relative; display: flex; min-height: 360px; flex: 1; background: var(--surface); }
.request-list { display: grid; width: 100%; align-content: start; gap: 12px; padding: 16px; }
.request-card { overflow: hidden; background: var(--surface); border: 1px solid var(--line-2); border-radius: var(--r-sm); }
.request-card:focus-within { border-color: var(--ink); box-shadow: var(--focus-ring); }
.request-card-header { display: flex; align-items: center; justify-content: space-between; padding: 10px 13px; background: var(--paper-2); border-bottom: 1px solid var(--line); }
.request-label { display: flex; gap: 10px; align-items: baseline; font-size: 0.75rem; font-weight: 700; color: var(--ink); }
.request-token-count { color: var(--ink-2); font-family: var(--font-mono); font-size: 0.68rem; font-weight: 500; }
.remove-request { padding: 3px 5px; color: var(--ink-3); background: transparent; border: 0; cursor: pointer; font-size: 0.7rem; }
.remove-request:hover { color: var(--red-600); }
.remove-request:focus-visible { outline: 3px solid transparent; box-shadow: var(--focus-ring); border-radius: var(--r-xs); }
.request-text { width: 100%; min-height: 150px; resize: vertical; padding: 17px; color: var(--ink); background: transparent; border: 0; outline: 3px solid transparent; font-family: var(--font-mono); font-size: 0.93rem; line-height: 1.7; tab-size: 2; }
.request-card:only-child .request-text { min-height: 280px; }
.request-text::placeholder { color: var(--ink-3); }
.drop-message { position: absolute; z-index: 2; display: none; inset: 12px; place-items: center; color: var(--blue-ink); background: var(--blue-soft); border-radius: var(--r-md); font-family: var(--font-display); font-weight: 600; }
.editor-wrap.is-dragging .drop-message { display: grid; }
.editor-footer { border-top: 1px dashed var(--line-2); }
.toggle { display: flex; gap: 9px; align-items: center; color: var(--ink-2); cursor: pointer; font-size: 0.8rem; font-weight: 500; }
.toggle input { position: absolute; opacity: 0; }
.toggle-track { position: relative; width: 34px; height: 20px; background: var(--line-strong); border-radius: var(--r-pill); }
.toggle input:focus-visible + .toggle-track { box-shadow: var(--focus-ring); }
.toggle-track::after { position: absolute; top: 3px; left: 3px; width: 14px; height: 14px; background: var(--paper); border-radius: 50%; content: ""; transition: transform 150ms ease; }
.toggle input:checked + .toggle-track { background: var(--yellow); }
.toggle input:checked + .toggle-track::after { transform: translateX(14px); }

.results-panel { display: flex; min-width: 0; flex-direction: column; padding: 27px; background: var(--paper-2); }
.result-heading { display: flex; justify-content: space-between; color: var(--ink-2); font-family: var(--font-mono); font-size: 0.72rem; font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; }
.result-state { color: var(--ink-2); letter-spacing: 0; text-transform: none; }
.token-total { overflow: hidden; margin-top: 22px; font-family: var(--font-display); font-size: clamp(4rem, 8vw, 6.7rem); font-weight: 700; letter-spacing: -0.03em; line-height: 0.9; text-overflow: ellipsis; color: var(--ink); }
.model-used { overflow: hidden; margin: 13px 0 30px; color: var(--ink-2); font-family: var(--font-mono); font-size: 0.72rem; text-overflow: ellipsis; white-space: nowrap; }
.metrics { display: grid; grid-template-columns: 1fr 1fr; margin: 0; border-top: 1px solid var(--line); }
.metrics div { padding: 14px 0; border-bottom: 1px solid var(--line); }
.metrics div:nth-child(odd) { padding-right: 14px; border-right: 1px solid var(--line); }
.metrics div:nth-child(even) { padding-left: 14px; }
.metrics dt { margin-bottom: 6px; color: var(--ink-3); font-size: 0.7rem; }
.metrics dd { margin: 0; font-family: var(--font-mono); font-size: 0.96rem; font-weight: 600; color: var(--ink); }
.runtime-note { display: flex; gap: 10px; align-items: flex-start; margin-top: auto; padding-top: 25px; color: var(--ink-2); font-size: 0.72rem; line-height: 1.5; }
.runtime-note > span { color: var(--ink-3); font-family: var(--font-mono); }
.runtime-note p { margin-bottom: 0; }

.token-section, .fine-print { margin-top: 62px; }
.section-heading { display: flex; gap: 14px; align-items: center; margin-bottom: 26px; }
.section-heading::after { content: ""; order: 1; flex: 1; min-width: 40px; height: 1px; background: var(--line-2); }
.section-heading > p.meta { order: 2; }
.section-heading h2, .fine-print h2 { margin-bottom: 0; font-family: var(--font-display); font-weight: 600; font-size: var(--h2); letter-spacing: -0.015em; color: var(--ink); }
.section-heading .edu-overline { margin: 0 0 6px; }
.section-heading > p.meta { margin-bottom: 0; color: var(--ink-2); font-family: var(--font-mono); font-size: 0.7rem; }
.request-breakdowns { display: grid; gap: 18px; }
.request-breakdown { overflow: hidden; background: var(--surface); border: 1px solid var(--line-2); border-radius: var(--r-lg); box-shadow: var(--shadow-sm); }
.request-breakdown-heading { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; background: var(--paper-2); border-bottom: 1px solid var(--line); }
.request-breakdown-heading h3, .request-breakdown-heading p { margin: 0; }
.request-breakdown-heading h3 { font-family: var(--font-display); font-weight: 600; font-size: 0.83rem; color: var(--ink); }
.request-breakdown-heading p { color: var(--ink-2); font-family: var(--font-mono); font-size: 0.7rem; }
.token-map { display: flex; flex-wrap: wrap; gap: 7px; padding: 20px; }
.token-chip { display: inline-flex; overflow: hidden; max-width: 100%; border: 1px solid var(--line-2); border-radius: var(--r-xs); }
.token-text, .token-id { padding: 6px 8px; font-family: var(--font-mono); font-size: 0.72rem; white-space: pre-wrap; overflow-wrap: anywhere; }
.token-text { background: var(--paper); color: var(--ink); }
.token-id { color: var(--ink-2); background: var(--paper-3); border-left: 1px solid var(--line-2); }
.empty-request { margin: 0; padding: 18px; color: var(--ink-2); font-size: 0.8rem; }
.fine-print { display: grid; grid-template-columns: minmax(220px, 0.7fr) minmax(0, 1.3fr); gap: 40px; padding-top: 34px; border-top: 1px solid var(--line); }
.fine-print p { max-width: 680px; margin-bottom: 0; color: var(--ink-2); line-height: 1.65; }
.toast { position: fixed; right: 20px; bottom: 20px; z-index: 5; max-width: min(430px, calc(100% - 40px)); padding: 12px 16px; color: var(--paper); background: var(--ink); border-radius: var(--r-sm); box-shadow: var(--shadow-lg); font-size: 0.82rem; opacity: 0; pointer-events: none; transform: translateY(10px); transition: 150ms ease; }
.toast.is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 800px) {
  .site-header-inner, main { width: min(100% - 28px, 680px); padding-left: 0; padding-right: 0; }
  main { padding-top: 40px; }
  .workspace { grid-template-columns: 1fr; }
  .editor-panel { border-right: 0; border-bottom: 1px solid var(--line); }
  .results-panel { min-height: 450px; }
  .fine-print { grid-template-columns: 1fr; gap: 16px; }
}
@media (max-width: 560px) {
  .brand small { display: none; }
  .local-badge { font-size: 0.64rem; }
  .panel-toolbar, .editor-footer { align-items: stretch; flex-direction: column; }
  .model-field, .model-field select { width: 100%; }
  .toolbar-actions, .count-actions { justify-content: flex-end; }
  .section-heading { flex-wrap: wrap; }
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}