/* Research Desk marketing site — paper-cream desk, forest-green ink, terracotta reserved for the primary action. Editorial serif headlines, product shown in-page. */
:root {
  --bg: #f4f1e8;
  --bg-2: #ece7d9;
  --surface: #fbf9f3;
  --line: #e0d9c8;
  --ink: #1e2a24;
  --muted: #625f53;
  --accent: #1f4a39;
  --accent-ink: #f6f2e6;
  --accent-soft: #e3ebe2;
  --terra: #c0532f;
  --terra-soft: #f6e3da;
  --warn: #a8690f; --warn-soft: #f7ebd2;
  --crit: #b23a2a; --crit-soft: #f8e1dc;
  --font-ui: "Be Vietnam Pro", "Segoe UI", system-ui, sans-serif;
  --font-display: "Newsreader", Georgia, serif;
  --font-doc: "Source Serif 4", Georgia, serif;
  --r: 12px;
  --shadow: 0 1px 2px rgba(40,35,20,.05), 0 18px 40px -18px rgba(40,35,20,.18);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #121714; --bg-2: #18201b; --surface: #1b231e; --line: #2c372f; --ink: #ebe6d8; --muted: #a29f91;
    --accent: #8cc3a5; --accent-ink: #10201a; --accent-soft: #1f3329; --terra: #e57d57; --terra-soft: #3a2219;
    --warn: #e5b45c; --warn-soft: #382c15; --crit: #f08a7a; --crit-soft: #3b1f1a;
    --shadow: 0 1px 2px rgba(0,0,0,.4); color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #121714; --bg-2: #18201b; --surface: #1b231e; --line: #2c372f; --ink: #ebe6d8; --muted: #a29f91;
  --accent: #8cc3a5; --accent-ink: #10201a; --accent-soft: #1f3329; --terra: #e57d57; --terra-soft: #3a2219;
  --warn: #e5b45c; --warn-soft: #382c15; --crit: #f08a7a; --crit-soft: #3b1f1a;
  --shadow: 0 1px 2px rgba(0,0,0,.4); color-scheme: dark;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; animation: none !important; } }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.6 var(--font-ui); }
a { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 600; color: var(--accent); text-wrap: balance; margin: 0; letter-spacing: -0.015em; }
h1 { font-size: clamp(40px, 6vw, 76px); line-height: 1.02; }
h2 { font-size: clamp(30px, 3.8vw, 48px); line-height: 1.08; }
h3 { font-size: 23px; line-height: 1.2; }
p { margin: 0; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.eyebrow { font-size: 13px; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--terra); }
.lead { font-size: 20px; color: var(--muted); max-width: 62ch; }
.muted { color: var(--muted); }

/* Nav */
.nav { position: sticky; top: 0; z-index: 20; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid transparent; }
.nav.scrolled { border-bottom-color: var(--line); }
.nav .wrap { display: flex; align-items: center; gap: 28px; height: 72px; }
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--accent); }
.brand span { font-family: var(--font-display); font-size: 24px; font-weight: 600; }
.nav-links { display: flex; gap: 24px; flex: 1; }
.nav-links a { color: var(--ink); text-decoration: none; font-size: 15px; }
.nav-links a:hover { color: var(--accent); }
.nav-cta { display: flex; gap: 10px; align-items: center; }
.btn { display: inline-flex; align-items: center; gap: 10px; border-radius: 8px; padding: 12px 20px; font: 600 16px var(--font-ui); text-decoration: none; border: 1.5px solid transparent; cursor: pointer; transition: transform .15s ease, filter .15s ease; }
.btn:hover { transform: translateY(-1px); }
.btn-cta { background: var(--terra); color: #fff; }
.btn-cta:hover { filter: brightness(1.06); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-ghost { border-color: var(--line); color: var(--ink); background: var(--surface); }
.btn-ghost:hover { border-color: var(--accent); }
.btn-sm { padding: 8px 14px; font-size: 14px; }

/* Hero */
.hero { padding: 72px 0 40px; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1fr); gap: 56px; }
.hero-copy { display: grid; gap: 24px; max-width: 880px; }
.hero-copy h1 em { font-style: italic; color: var(--terra); }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.hero-proof { display: flex; gap: 22px; flex-wrap: wrap; font-size: 14px; color: var(--muted); }
.hero-proof span { display: inline-flex; gap: 8px; align-items: center; }
.hero-proof svg { color: var(--accent); }

/* Product mock */
.mock { background: var(--surface); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); overflow: hidden; }
.mock-bar { display: flex; gap: 6px; padding: 12px 16px; border-bottom: 1px solid var(--line); align-items: center; }
.mock-bar i { width: 10px; height: 10px; border-radius: 50%; background: var(--line); display: block; }
.mock-bar b { margin-left: 12px; font: 500 13px var(--font-ui); color: var(--muted); }
.mock-body { display: grid; grid-template-columns: 200px minmax(0, 1fr) 270px; min-height: 420px; }
.mock-side { background: var(--bg); border-right: 1px solid var(--line); padding: 16px 12px; display: grid; align-content: start; gap: 4px; font-size: 13px; }
.mock-side .it { display: flex; gap: 8px; align-items: center; padding: 8px 10px; border-radius: 7px; }
.mock-side .it.on { background: var(--accent); color: var(--accent-ink); }
.mock-side .n { width: 20px; height: 20px; border-radius: 50%; border: 1.5px solid currentColor; display: grid; place-items: center; font-size: 10px; font-weight: 700; flex: none; }
.mock-side .it.done .n { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.mock-main { padding: 22px 26px; display: grid; gap: 14px; align-content: start; }
.mock-main .k { font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.mock-main h4 { margin: 0; font-family: var(--font-display); font-size: 26px; color: var(--accent); font-weight: 600; }
.gap4 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.gap4 div { background: var(--bg); border-radius: 8px; padding: 10px 12px; font-size: 13px; line-height: 1.45; }
.gap4 small { display: block; font-size: 10.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); font-weight: 600; margin-bottom: 4px; }
.doc { font-family: var(--font-doc); font-size: 15.5px; line-height: 1.7; }
.cite { background: var(--accent-soft); color: var(--accent); border-radius: 4px; padding: 1px 5px; font: 500 12.5px var(--font-ui); white-space: nowrap; }
.cite.hl { outline: 2px solid var(--terra); outline-offset: 1px; }
.flag { display: flex; gap: 8px; align-items: center; background: var(--warn-soft); color: var(--warn); border-radius: 7px; padding: 8px 10px; font-size: 12.5px; font-weight: 500; }
.mock-panel { border-left: 1px solid var(--line); padding: 18px 16px; display: grid; gap: 12px; align-content: start; font-size: 13px; }
.mock-panel .src { font-family: var(--font-doc); font-size: 14px; line-height: 1.45; }
.note { border: 1px solid var(--line); border-radius: 8px; padding: 10px; display: grid; gap: 4px; }
.note .t { font-size: 10.5px; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: #555889; }
.uses { display: grid; gap: 6px; }
.uses span { display: block; padding: 6px 8px; background: var(--bg); border-radius: 6px; }

/* Sections */
section.block { padding: 110px 0; }
section.block.alt { background: var(--bg-2); }
.sec-head { display: grid; gap: 16px; max-width: 760px; margin-bottom: 56px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 22px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 28px; align-items: center; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 28px; display: grid; gap: 12px; align-content: start; }
.card .num { font-family: var(--font-display); font-size: 44px; line-height: 1; color: var(--terra); font-weight: 600; }
.pain p { color: var(--muted); }
.pain q { font-family: var(--font-display); font-size: 22px; line-height: 1.3; color: var(--ink); quotes: "“" "”"; }

/* Chain */
.chain { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 0; position: relative; }
.chain::before { content: ""; position: absolute; left: 7%; right: 7%; top: 31px; height: 2px; background: linear-gradient(90deg, var(--accent), var(--terra)); opacity: .5; }
.chain .node { display: grid; justify-items: center; text-align: center; gap: 10px; padding: 0 6px; position: relative; }
.chain .dot { width: 64px; height: 64px; border-radius: 50%; background: var(--surface); border: 2px solid var(--accent); display: grid; place-items: center; color: var(--accent); position: relative; z-index: 1; }
.chain .node:last-child .dot { border-color: var(--terra); color: var(--terra); }
.chain b { font-size: 15px; }
.chain small { font-size: 13px; color: var(--muted); line-height: 1.4; }
.qa { margin-top: 48px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0; border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; background: var(--surface); }
.qa > div { padding: 28px; display: grid; gap: 10px; align-content: start; }
.qa > div + div { border-left: 1px solid var(--line); }
.qa .who { font-size: 13px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.qa q { font-family: var(--font-display); font-size: 24px; line-height: 1.3; quotes: "“" "”"; }

/* Steps */
.steps { display: grid; gap: 0; border-top: 1px solid var(--line); }
.step { display: grid; grid-template-columns: 80px minmax(0, 1.1fr) minmax(0, 1fr); gap: 28px; padding: 30px 0; border-bottom: 1px solid var(--line); align-items: start; }
.step .n { font-family: var(--font-display); font-size: 48px; line-height: .9; color: var(--terra); font-weight: 600; }
.step h3 { margin-bottom: 6px; }
.step p { color: var(--muted); }
.step ul { margin: 0; padding-left: 18px; color: var(--ink); font-size: 15.5px; display: grid; gap: 4px; }

/* Feature rows */
.feature { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr); gap: 56px; align-items: center; padding: 40px 0; }
.feature.rev { grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr); }
.feature.rev .f-copy { order: 2; }
.f-copy { display: grid; gap: 16px; }
.f-copy ul { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.f-copy li { display: flex; gap: 10px; align-items: flex-start; }
.f-copy li svg { flex: none; margin-top: 4px; color: var(--accent); }
.panel { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow); padding: 22px; display: grid; gap: 12px; }
.vrow { display: flex; gap: 12px; align-items: center; padding: 12px 14px; border: 1px solid var(--line); border-radius: 9px; font-size: 14.5px; background: var(--bg); }
.vrow b { font-family: var(--font-display); font-size: 20px; color: var(--accent); width: 34px; }
.vrow .grow { flex: 1; }
.pill { font-size: 12px; font-weight: 600; padding: 3px 10px; border-radius: 999px; white-space: nowrap; }
.pill.ok { background: var(--accent-soft); color: var(--accent); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.terra { background: var(--terra-soft); color: var(--terra); }
.comment { border-left: 3px solid var(--terra); background: var(--bg); padding: 12px 14px; border-radius: 0 8px 8px 0; font-size: 14.5px; display: grid; gap: 4px; }
.comment small { color: var(--muted); }
.diff del { background: var(--crit-soft); color: var(--crit); }
.diff ins { background: var(--accent-soft); color: var(--accent); text-decoration: none; }
.check { display: flex; gap: 12px; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 14.5px; }
.check:last-child { border-bottom: 0; }
.check .grow { flex: 1; }

/* Roles */
.role { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 30px; display: grid; gap: 14px; align-content: start; }
.role .ico { width: 52px; height: 52px; border-radius: 12px; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; }
.role ul { margin: 0; padding-left: 18px; color: var(--muted); display: grid; gap: 6px; font-size: 15.5px; }

/* Principles */
.principles { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0; border-top: 1px solid var(--line); }
.principle { padding: 28px 28px 28px 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 44px minmax(0, 1fr); gap: 16px; }
.principle:nth-child(odd) { border-right: 1px solid var(--line); }
.principle:nth-child(even) { padding-left: 28px; }
.principle svg { color: var(--terra); }
.principle p { color: var(--muted); margin-top: 6px; }

/* FAQ */
.faq { display: grid; gap: 0; border-top: 1px solid var(--line); max-width: 880px; }
.faq details { border-bottom: 1px solid var(--line); padding: 22px 0; }
.faq summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 16px; font-family: var(--font-display); font-size: 22px; color: var(--ink); }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--terra); font-family: var(--font-ui); font-size: 26px; line-height: 1; }
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--muted); margin-top: 12px; max-width: 70ch; }

/* CTA band */
.band { background: var(--accent); color: var(--accent-ink); border-radius: 20px; padding: 64px; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 32px; align-items: center; position: relative; overflow: hidden; }
.band h2 { color: inherit; }
.band p { opacity: .85; margin-top: 12px; max-width: 56ch; }
.band .btn-light { background: #f6f2e6; color: #1f4a39; }
:root[data-theme="dark"] .band, .band { }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .band { background: #1e3b2f; color: #f1ecdf; } }
:root[data-theme="dark"] .band { background: #1e3b2f; color: #f1ecdf; }

/* Footer */
footer { padding: 64px 0 48px; border-top: 1px solid var(--line); font-size: 15px; }
.foot a.brand { display: flex; padding: 0; }
.foot { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 32px; }
.foot h4 { margin: 0 0 12px; font-size: 13px; letter-spacing: .1em; text-transform: uppercase; color: var(--muted); }
.foot a { display: block; color: var(--ink); text-decoration: none; padding: 3px 0; }
.foot a:hover { color: var(--accent); }
.legal { margin-top: 40px; font-size: 13px; color: var(--muted); display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* Page hero (sub pages) */
.page-hero { padding: 80px 0 40px; display: grid; gap: 20px; }
.form { display: grid; gap: 14px; }
.form .row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form label { display: grid; gap: 6px; font-size: 14px; font-weight: 500; }
.form input, .form select, .form textarea { font: inherit; font-size: 16px; padding: 11px 13px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: var(--ink); width: 100%; }
.form textarea { min-height: 120px; resize: vertical; }
.form input:focus, .form select:focus, .form textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-soft); }
.notice { padding: 14px 16px; border-radius: 10px; font-size: 15px; }
.notice.ok { background: var(--accent-soft); color: var(--accent); }
.notice.err { background: var(--crit-soft); color: var(--crit); }
.table { width: 100%; border-collapse: collapse; font-size: 15px; }
.table th, .table td { text-align: left; padding: 14px 12px; border-bottom: 1px solid var(--line); vertical-align: top; }
.table th { font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.scroll-x { overflow-x: auto; }

@media (max-width: 1080px) {
  .mock-body { grid-template-columns: 170px minmax(0, 1fr); }
  .mock-panel { display: none; }
  .chain { grid-template-columns: repeat(4, minmax(0, 1fr)); row-gap: 32px; }
  .chain::before { display: none; }
}
@media (max-width: 860px) {
  .nav-links { display: none; }
  .grid-3, .grid-2, .feature, .feature.rev, .qa, .principles, .foot, .band { grid-template-columns: 1fr; }
  .feature.rev .f-copy { order: 0; }
  .qa > div + div { border-left: 0; border-top: 1px solid var(--line); }
  .principle:nth-child(odd) { border-right: 0; }
  .principle, .principle:nth-child(even) { padding: 24px 0; }
  .step { grid-template-columns: 56px minmax(0, 1fr); }
  .step ul { grid-column: 2; }
  .band { padding: 40px 28px; }
  section.block { padding: 72px 0; }
  .form .row2 { grid-template-columns: 1fr; }
}
@media (max-width: 620px) {
  body { font-size: 16px; }
  .wrap { padding: 0 18px; }
  .nav-cta .btn-ghost { display: none; }
  .mock-body { grid-template-columns: 1fr; }
  .mock-side { display: none; }
  .gap4 { grid-template-columns: 1fr; }
  .chain { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .lead { font-size: 18px; }
}
.brand span, .btn { white-space: nowrap; }
@media (max-width: 620px) {
  .brand span { font-size: 20px; }
  .nav .wrap { gap: 12px; }
  .nav-cta .btn-cta { padding: 8px 12px; font-size: 13.5px; }
  .hero { padding-top: 40px; }
}
.theme-btn { width: 40px; height: 40px; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); display: inline-grid; place-items: center; cursor: pointer; }
.theme-btn:hover { border-color: var(--accent); }
.theme-btn .i-sun { display: none; }
:root[data-theme="dark"] .theme-btn .i-sun { display: inline; }
:root[data-theme="dark"] .theme-btn .i-moon { display: none; }
@media (prefers-color-scheme: dark) { :root:not([data-theme]) .theme-btn .i-sun { display: inline; } :root:not([data-theme]) .theme-btn .i-moon { display: none; } }