:root {
  --paper: #EFE9DA;
  --paper-card: #FBF8F0;
  --ink: #1A2421;
  --ink-soft: #4B564E;
  --teal: #234139;
  --teal-deep: #16281F;
  --highlight: #F2C230;
  --rust: #B4472A;
  --rust-deep: #8F3520;
  --line: #D8CFB7;

  --font-display: 'Lora', Georgia, serif;
  --font-body: 'Inter', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --radius: 10px;
  --wrap: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.55;
}

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

h1, h2, h3 { font-family: var(--font-display); color: var(--teal-deep); margin: 0; }

a { color: inherit; }

/* Header */
.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 20;
}
.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.3rem;
  text-decoration: none;
  color: var(--teal-deep);
}
.brand span { color: var(--rust); }
.brand-dot { color: var(--ink-soft) !important; font-size: 0.9rem; }
.main-nav { display: flex; gap: 28px; }
.main-nav a { text-decoration: none; font-size: 0.95rem; color: var(--ink-soft); }
.main-nav a:hover { color: var(--teal-deep); }

.settings-btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 14px;
  cursor: pointer;
  color: var(--ink-soft);
  display: flex;
  align-items: center;
  gap: 6px;
}
.token-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--line); }
.token-dot.set { background: var(--teal); }

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
  padding-top: 72px;
  padding-bottom: 80px;
}
.kicker { font-size: 0.95rem; color: var(--rust); margin: 0 0 12px; }
.hero h1 {
  font-size: 3.3rem;
  line-height: 1.08;
  letter-spacing: -0.01em;
}
.hero-lede { max-width: 46ch; color: var(--ink-soft); font-size: 1.08rem; margin: 20px 0 28px; }
.hero-actions { display: flex; gap: 14px; margin-bottom: 18px; }
.hero-note { font-size: 0.85rem; color: var(--ink-soft); max-width: 42ch; }

.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 12px 22px;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}
.btn-primary { background: var(--rust); color: #fff; }
.btn-primary:hover { background: var(--rust-deep); }
.btn-ghost { background: transparent; border-color: var(--teal); color: var(--teal-deep); }
.btn-ghost:hover { background: rgba(35,65,57,0.08); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; }

.hero-doc { display: flex; justify-content: center; }
.doc-card {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  width: 100%;
  max-width: 380px;
  box-shadow: 6px 6px 0 var(--teal-deep);
}
.doc-card-head {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--ink-soft);
  margin-bottom: 14px;
}
.doc-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--rust); }
.doc-text { font-size: 0.95rem; color: var(--ink); }
.doc-text mark { background: var(--highlight); color: var(--ink); padding: 0 2px; }
.doc-answer {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
}
.doc-answer-label { font-family: var(--font-mono); font-size: 0.72rem; color: var(--teal); }
.doc-answer p { font-style: italic; margin: 6px 0; }
.doc-score { font-family: var(--font-mono); font-size: 0.75rem; color: var(--rust); }

/* Section shared */
section { padding: 64px 0; }
.section-lede { color: var(--ink-soft); max-width: 60ch; margin: 10px 0 32px; }

/* Tools grid */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
.tool-card {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.tool-mark {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: lowercase;
  color: var(--rust);
  display: inline-block;
  margin-bottom: 10px;
}
.tool-card h3 { font-size: 1.15rem; margin-bottom: 8px; }
.tool-card p { margin: 0; color: var(--ink-soft); font-size: 0.92rem; }

/* Workbench */
.bench-input label { font-weight: 600; font-size: 0.9rem; }
.bench-input textarea {
  width: 100%;
  min-height: 160px;
  margin-top: 8px;
  padding: 14px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--paper-card);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--ink);
  resize: vertical;
}
.bench-input-row { display: flex; align-items: center; gap: 14px; margin-top: 10px; }
.file-btn {
  font-size: 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 16px;
  cursor: pointer;
  background: var(--paper-card);
}
.file-status { font-size: 0.82rem; color: var(--ink-soft); }

.bench-tabs { display: flex; gap: 6px; margin: 28px 0 0; border-bottom: 1px solid var(--line); }
.tab-btn {
  font-family: var(--font-body);
  font-size: 0.9rem;
  padding: 10px 16px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  color: var(--ink-soft);
}
.tab-btn.active { color: var(--teal-deep); border-color: var(--rust); font-weight: 600; }

.bench-panel { display: none; padding-top: 20px; }
.bench-panel.active { display: block; }

.qa-row { display: flex; gap: 10px; }
.qa-row input {
  flex: 1;
  padding: 12px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  font-family: var(--font-body);
  font-size: 0.95rem;
}

.result {
  margin-top: 18px;
  padding: 16px 18px;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  min-height: 24px;
  font-size: 0.95rem;
  white-space: pre-wrap;
}
.result:empty { display: none; }
.result .score { font-family: var(--font-mono); font-size: 0.78rem; color: var(--rust); display: block; margin-top: 8px; }

.chat-log {
  max-height: 340px;
  overflow-y: auto;
  padding: 16px;
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin-bottom: 12px;
}
.chat-msg { padding: 9px 13px; border-radius: 8px; margin-bottom: 10px; max-width: 80%; font-size: 0.93rem; }
.chat-bot { background: var(--paper); }
.chat-user { background: var(--teal); color: #fff; margin-left: auto; }

/* PDF tools */
.pdf-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.pdf-card {
  background: var(--paper-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.pdf-card h3 { font-size: 1.05rem; }
.pdf-card p { margin: 0; color: var(--ink-soft); font-size: 0.9rem; }
.pdf-file-list { list-style: none; margin: 0; padding: 0; font-size: 0.82rem; color: var(--ink-soft); }
.pdf-file-list li { padding: 3px 0; border-bottom: 1px dashed var(--line); }

/* Image gen */
.image-form { display: flex; gap: 10px; }
.image-form input {
  flex: 1;
  padding: 12px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  font-family: var(--font-body);
}
.image-result { margin-top: 20px; }
.image-result img { max-width: 100%; border-radius: var(--radius); border: 1px solid var(--line); }

/* About */
.about-steps { padding-left: 22px; color: var(--ink-soft); }
.about-steps li { margin-bottom: 10px; }
.about-steps strong { color: var(--ink); }
.about-note { font-size: 0.88rem; color: var(--ink-soft); margin-top: 20px; }

/* Footer */
.site-footer { border-top: 1px solid var(--line); padding: 24px 0; margin-top: 20px; }
.footer-row { display: flex; justify-content: space-between; font-size: 0.82rem; color: var(--ink-soft); flex-wrap: wrap; gap: 8px; }

/* Modal */
.modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(26,36,33,0.5);
  align-items: center;
  justify-content: center;
  z-index: 50;
}
.modal-backdrop.open { display: flex; }
.modal {
  background: var(--paper-card);
  border-radius: var(--radius);
  padding: 26px;
  max-width: 400px;
  width: 90%;
}
.modal h3 { margin-bottom: 10px; }
.modal p { font-size: 0.88rem; color: var(--ink-soft); }
.modal input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  margin: 12px 0;
  font-family: var(--font-mono);
}
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; }

/* Responsive */
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; padding-top: 40px; }
  .hero h1 { font-size: 2.4rem; }
  .tool-grid, .pdf-grid { grid-template-columns: 1fr; }
  .main-nav { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
}