/* Layout: PLS-QCA Studio system — white ground, one ink, cobalt-to-violet accent, hairline grids; tool pages are a two-pane workbench over APA three-line result tables. */
:root {
  --bg: #ffffff; --surface: #ffffff; --sunken: #f4f5f8; --ink: #0f1a33; --ink-2: #384152; --muted: #687083;
  --line: #e6e8ee; --line-2: #d3d7e0;
  --accent: #2563eb; --accent-2: #7a4cf0; --accent-ink: #ffffff; --accent-soft: #eef3fe; --accent-line: #c9d8fb;
  --grad: linear-gradient(90deg, #2f6df6 0%, #5a5cf3 55%, #7b4cf0 100%);
  --good: #1d7649; --good-soft: #e8f3ec; --warn: #8f5e06; --warn-soft: #faf2e0; --bad: #b2353a; --bad-soft: #fbeceb;
  --logo-tile: #eef2fd; --logo-ink: #0f1a33; --logo-grad: linear-gradient(90deg, #1479f0 0%, #3a6cf4 50%, #6a3df0 100%);
  --c1: #2563eb; --c2: #7a4cf0; --c3: #0e9384; --c4: #d9711c; --c5: #c03a76; --c6: #5b6b8c;
  --f-sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --f-mono: "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --r: 10px; --r-lg: 14px;
  --ring: 0 0 0 3px color-mix(in srgb, var(--accent) 28%, transparent);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) {
  --bg: #0d1017; --surface: #151924; --sunken: #1b2030; --ink: #eceef4; --ink-2: #c6cad4; --muted: #979db0;
  --line: #262b3a; --line-2: #343a4c;
  --accent: #7ea4ff; --accent-2: #a68bff; --accent-ink: #0b0e18; --accent-soft: #1a2142; --accent-line: #334179;
  --good: #6fcf9b; --good-soft: #12261b; --warn: #e5b75e; --warn-soft: #2b2312; --bad: #f08b8b; --bad-soft: #321819;
  --logo-tile: #1a2142; --logo-ink: #eceef4; --logo-grad: linear-gradient(90deg, #4d9bff 0%, #7a8cff 50%, #a083ff 100%);
  --c1: #7ea4ff; --c2: #a68bff; --c3: #4fd1bf; --c4: #f2a25c; --c5: #f07fb0; --c6: #a4b0c8;
  color-scheme: dark; } }
:root[data-theme="dark"] {
  --bg: #0d1017; --surface: #151924; --sunken: #1b2030; --ink: #eceef4; --ink-2: #c6cad4; --muted: #979db0;
  --line: #262b3a; --line-2: #343a4c;
  --accent: #7ea4ff; --accent-2: #a68bff; --accent-ink: #0b0e18; --accent-soft: #1a2142; --accent-line: #334179;
  --good: #6fcf9b; --good-soft: #12261b; --warn: #e5b75e; --warn-soft: #2b2312; --bad: #f08b8b; --bad-soft: #321819;
  --logo-tile: #1a2142; --logo-ink: #eceef4; --logo-grad: linear-gradient(90deg, #4d9bff 0%, #7a8cff 50%, #a083ff 100%);
  --c1: #7ea4ff; --c2: #a68bff; --c3: #4fd1bf; --c4: #f2a25c; --c5: #f07fb0; --c6: #a4b0c8;
  color-scheme: dark; }

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.6 var(--f-sans); -webkit-font-smoothing: antialiased; }
img, svg { max-width: 100%; }
h1, h2, h3, h4 { margin: 0; line-height: 1.15; letter-spacing: -0.02em; font-weight: 600; text-wrap: balance; }
p { margin: 0; }
a { color: var(--accent); text-underline-offset: 3px; }
code, kbd, .mono { font-family: var(--f-mono); font-size: .9em; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.wrap { width: 100%; max-width: 1180px; margin: 0 auto; padding-inline: 20px; }
@media (max-width: 480px) { .wrap { padding-inline: 16px; } }
.eyebrow { font: 500 12px/1 var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.grad-text { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; font: 500 14px/1 var(--f-sans); color: var(--ink); background: var(--surface); border: 1px solid var(--line-2); border-radius: 9px; padding: 10px 15px; cursor: pointer; text-decoration: none; white-space: nowrap; transition: border-color .15s, background .15s; }
.btn:hover { border-color: var(--ink-2); }
.btn svg { width: 16px; height: 16px; }
.btn.primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn.primary:hover { background: var(--ink-2); border-color: var(--ink-2); }
.btn.accent { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }
.btn.accent:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; border-color: transparent; color: var(--ink-2); }
.btn.ghost:hover { background: var(--sunken); }
.btn.lg { padding: 13px 20px; font-size: 15px; border-radius: 10px; }
.btn.sm { padding: 7px 11px; font-size: 13px; border-radius: 8px; }
.btn.xs { padding: 5px 9px; font-size: 12px; border-radius: 7px; }
.btn:disabled { opacity: .4; cursor: not-allowed; }
:focus-visible { outline: none; box-shadow: var(--ring); border-radius: 6px; }
.icon-btn { width: 34px; height: 34px; display: inline-grid; place-items: center; border: 1px solid var(--line); background: var(--surface); color: var(--ink-2); border-radius: 9px; cursor: pointer; }
.icon-btn:hover { border-color: var(--line-2); color: var(--ink); }
.icon-btn svg { width: 17px; height: 17px; }
.icon-btn .moon { display: none; }
:root[data-theme="dark"] .icon-btn .sun { display: none; }
:root[data-theme="dark"] .icon-btn .moon { display: block; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) .icon-btn .sun { display: none; } :root:not([data-theme="light"]) .icon-btn .moon { display: block; } }

/* brand */
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 700; letter-spacing: -0.02em; font-size: 17px; white-space: nowrap; }
.brand-mark { width: 34px; height: 34px; flex: none; }
.brand-mark .logo-tile { fill: var(--logo-tile); }
.wordmark { font-family: "Lexend", var(--f-sans); font-weight: 600; letter-spacing: -0.025em; font-size: 18px; color: var(--logo-ink); }
.wm-grad { background: var(--logo-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
@media (max-width: 420px) { .wordmark { font-size: 15px; } .brand-mark { width: 30px; height: 30px; } .brand { gap: 8px; } }
.brand .word-2 { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; font-weight: 600; }

/* header / footer */
.site-head { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 30; background: color-mix(in srgb, var(--bg) 90%, transparent); backdrop-filter: saturate(1.4) blur(10px); -webkit-backdrop-filter: saturate(1.4) blur(10px); border-bottom: 1px solid transparent; }
.site-head.scrolled { border-bottom-color: var(--line); }
.site-head .wrap { display: flex; align-items: center; gap: 20px; height: 64px; position: relative; }
.site-nav { display: flex; gap: 2px; margin-left: auto; align-items: center; }
.site-nav a { color: var(--ink-2); text-decoration: none; font-size: 14px; padding: 8px 11px; border-radius: 8px; }
.site-nav a:hover, .site-nav a[aria-current="page"] { color: var(--ink); background: var(--sunken); }
.site-nav a .ext { font-size: 11px; color: var(--muted); margin-left: 3px; }
.head-tools { display: flex; align-items: center; gap: 8px; }
.menu-btn { display: none !important; }
@media (max-width: 900px) {
  .site-nav { position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; align-items: stretch; background: var(--bg); border-bottom: 1px solid var(--line); padding: 8px 16px 16px; display: none; margin: 0; }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px; }
  .menu-btn { display: inline-grid !important; }
  .head-tools { margin-left: auto; }
}
@media (max-width: 520px) { .head-tools .btn { display: none; } }
.site-foot { border-top: 1px solid var(--line); padding-block: 48px 36px; margin-top: 40px; font-size: 14px; }
.foot-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 32px; }
.foot-grid h4 { font-size: 13px; font-weight: 600; margin-bottom: 12px; letter-spacing: 0; }
.foot-grid ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.foot-grid a { color: var(--muted); text-decoration: none; }
.foot-grid a:hover { color: var(--ink); }
.foot-grid > div:first-child p { color: var(--muted); margin-top: 12px; max-width: 40ch; }
.foot-base { margin-top: 36px; padding-top: 20px; border-top: 1px solid var(--line); display: flex; flex-wrap: wrap; gap: 8px 24px; justify-content: space-between; color: var(--muted); font-size: 13px; }
.foot-base a { color: var(--ink-2); }
.creator { margin-top: 14px; font-size: 13.5px; color: var(--muted); }
.creator a { color: var(--ink); font-weight: 600; text-decoration: none; }
@media (max-width: 760px) { .foot-grid { grid-template-columns: 1fr 1fr; } .foot-grid > :first-child { grid-column: 1 / -1; } }

/* hero */
.hero { padding-block: clamp(48px, 8vw, 96px) clamp(40px, 6vw, 64px); }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr); gap: clamp(32px, 5vw, 64px); align-items: center; }
@media (max-width: 920px) { .hero-grid { grid-template-columns: minmax(0, 1fr); } }
.hero .eyebrow { display: inline-flex; gap: 8px; align-items: center; margin-bottom: 22px; }
.hero .eyebrow i { width: 6px; height: 6px; border-radius: 50%; background: var(--good); display: inline-block; }
.hero h1 { font-size: clamp(38px, 5.6vw, 64px); line-height: 1.02; letter-spacing: -0.035em; font-weight: 600; }
.hero h1 em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lede { font-size: clamp(17px, 1.6vw, 19px); color: var(--ink-2); margin-top: 22px; max-width: 56ch; line-height: 1.6; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 32px; }
.trust { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 26px; color: var(--muted); font-size: 13.5px; }
.trust span { display: inline-flex; align-items: center; gap: 7px; }
.trust svg { width: 15px; height: 15px; color: var(--good); }
.byline { margin-top: 22px; font-size: 13.5px; color: var(--muted); }
.byline a { color: var(--ink); font-weight: 600; text-decoration: none; }
.byline a:hover { color: var(--accent); }
.hero-fig { border: 1px solid var(--line); border-radius: 16px; background: var(--surface); padding: 10px; min-width: 0; }
.hero-fig .bar { display: flex; gap: 6px; padding: 4px 6px 10px; align-items: center; }
.hero-fig .bar i { width: 9px; height: 9px; border-radius: 50%; background: var(--line-2); }
.hero-fig .bar span { margin-left: 8px; font: 500 11.5px/1 var(--f-mono); color: var(--muted); }
.hero-fig .canvas { border-radius: 10px; background: var(--bg); border: 1px solid var(--line); padding: 16px; display: grid; gap: 14px; }
.hero-fig svg { display: block; width: 100%; height: auto; }
.fig-caption { font-size: 12.5px; color: var(--muted); padding: 10px 6px 2px; }

/* sections */
.section { padding-block: clamp(56px, 8vw, 96px); border-top: 1px solid var(--line); }
.section-head { max-width: 680px; margin-bottom: 36px; }
.section-head h2 { font-size: clamp(28px, 3.4vw, 40px); letter-spacing: -0.03em; }
.section-head p { color: var(--ink-2); margin-top: 14px; font-size: 17px; }
.section-head .eyebrow { margin-bottom: 14px; display: block; }

/* catalog */
.finder { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-bottom: 28px; }
.search { position: relative; flex: 1 1 280px; max-width: 420px; }
.search svg { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); width: 16px; height: 16px; color: var(--muted); }
.search input { width: 100%; font: 15px/1 var(--f-sans); padding: 12px 14px 12px 38px; border: 1px solid var(--line-2); border-radius: 10px; background: var(--surface); color: var(--ink); }
.search input:focus { outline: none; box-shadow: var(--ring); border-color: var(--accent); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { font: 500 13px/1 var(--f-sans); padding: 8px 12px; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink-2); cursor: pointer; }
.chip:hover { border-color: var(--line-2); color: var(--ink); }
.chip[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.cat-block { margin-top: 40px; }
.cat-block:first-of-type { margin-top: 0; }
.cat-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.cat-head h3 { font-size: 20px; letter-spacing: -0.02em; }
.cat-head span { font: 500 12px/1 var(--f-mono); color: var(--muted); }
.features { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 16px; overflow: hidden; }
.feature { background: var(--surface); padding: 22px 22px 24px; display: grid; gap: 8px; align-content: start; text-decoration: none; color: inherit; position: relative; transition: background .15s; }
a.feature:hover { background: var(--sunken); }
a.feature:hover h3 { color: var(--accent); }
.feature .ico { width: 34px; height: 34px; border-radius: 9px; background: var(--accent-soft); color: var(--accent); display: grid; place-items: center; margin-bottom: 6px; }
.feature .ico svg { width: 18px; height: 18px; }
.feature h3 { font-size: 16.5px; letter-spacing: -0.015em; }
.feature p { color: var(--muted); font-size: 14px; line-height: 1.55; }
.feature .tag { font: 500 11px/1 var(--f-mono); color: var(--muted); letter-spacing: .04em; margin-top: 4px; }
.feature .tag b { color: var(--ink-2); font-weight: 500; }
.feature .arrow { position: absolute; top: 22px; right: 20px; color: var(--line-2); font-size: 16px; transition: color .15s, transform .15s; }
a.feature:hover .arrow { color: var(--accent); transform: translateX(2px); }
.features .filler { background: var(--surface); }
@media (max-width: 900px) { .features { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
@media (max-width: 600px) { .features { grid-template-columns: minmax(0, 1fr); } }
.empty-search { padding: 40px; text-align: center; border: 1px dashed var(--line-2); border-radius: 14px; color: var(--muted); }

/* PLS-SEM feature band */
.pls { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: clamp(24px, 4vw, 48px); align-items: center; border: 1px solid var(--accent-line); background: linear-gradient(135deg, var(--accent-soft), var(--surface) 70%); border-radius: 18px; padding: clamp(22px, 4vw, 40px); margin-bottom: 44px; }
@media (max-width: 860px) { .pls { grid-template-columns: minmax(0, 1fr); } }
.pls h3 { font-size: clamp(24px, 2.8vw, 32px); letter-spacing: -0.03em; margin-top: 12px; }
.pls p { color: var(--ink-2); margin-top: 12px; font-size: 15.5px; max-width: 52ch; }
.pls .hero-cta { margin-top: 22px; }
.pls-fig { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 12px; min-width: 0; }
.pls-fig svg { display: block; width: 100%; height: auto; }

/* steps / compare / faq / cite / cta */
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.step { border-top: 1.5px solid var(--ink); padding-top: 18px; display: grid; gap: 8px; align-content: start; }
.step .num { font: 500 13px/1 var(--f-mono); color: var(--muted); }
.step h3 { font-size: 18px; }
.step p { color: var(--muted); font-size: 14.5px; }
@media (max-width: 900px) { .steps { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); } }
@media (max-width: 520px) { .steps { grid-template-columns: minmax(0, 1fr); } }
.compare { overflow-x: auto; border: 1px solid var(--line); border-radius: 14px; }
.compare table { border-collapse: collapse; width: 100%; font-size: 14.5px; min-width: 620px; }
.compare th, .compare td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--line); }
.compare thead th { font-weight: 500; color: var(--muted); font-size: 13px; background: var(--sunken); }
.compare tbody tr:last-child td { border-bottom: 0; }
.compare td:nth-child(2) { color: var(--ink); font-weight: 500; }
.compare td { color: var(--ink-2); }
.yes { color: var(--good) !important; }
.faq { display: grid; border-top: 1px solid var(--line); max-width: 860px; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; list-style: none; padding: 20px 40px 20px 0; font-weight: 500; font-size: 17px; position: relative; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; position: absolute; right: 4px; top: 18px; font: 300 24px/1 var(--f-sans); color: var(--muted); }
.faq details[open] summary::after { content: "−"; }
.faq .ans { padding: 0 0 22px; color: var(--ink-2); max-width: 72ch; display: grid; gap: 10px; }
.cite-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; }
@media (max-width: 860px) { .cite-grid { grid-template-columns: minmax(0, 1fr); } }
.cite-box { border: 1px solid var(--line); border-radius: 14px; background: var(--surface); padding: 18px 20px; display: grid; gap: 10px; align-content: start; min-width: 0; }
.cite-box h3 { font-size: 15px; display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.cite-box p { color: var(--ink-2); font-size: 15px; line-height: 1.65; overflow-wrap: anywhere; }
.cite-box pre { margin: 0; background: var(--sunken); padding: 12px 14px; border-radius: 10px; overflow-x: auto; font: 12.5px/1.6 var(--f-mono); color: var(--ink-2); }
.cite-note { margin-top: 18px; padding: 14px 18px; border-radius: 12px; background: var(--accent-soft); border: 1px solid var(--accent-line); color: var(--ink-2); font-size: 15px; max-width: 860px; }
.cta-band { text-align: center; padding-block: clamp(64px, 9vw, 112px); border-top: 1px solid var(--line); }
.cta-band h2 { font-size: clamp(30px, 4vw, 48px); letter-spacing: -0.035em; max-width: 18ch; margin: 0 auto; }
.cta-band p { color: var(--ink-2); margin: 16px auto 0; max-width: 52ch; font-size: 17px; }
.cta-band .hero-cta { justify-content: center; }

/* ===== tool page ===== */
.crumbs { font-size: 13px; color: var(--muted); padding-top: 28px; }
.crumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; }
.crumbs a { color: var(--muted); text-decoration: none; }
.crumbs a:hover { color: var(--ink); }
.crumbs li + li::before { content: "/"; margin-right: 6px; color: var(--line-2); }
.tool-head { padding-block: 22px 28px; max-width: 820px; }
.tool-head h1 { font-size: clamp(30px, 4.2vw, 46px); letter-spacing: -0.035em; line-height: 1.06; }
.tool-head .lede { margin-top: 14px; font-size: 17px; }
.tool-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.pill { display: inline-flex; align-items: center; gap: 6px; font: 500 12px/1 var(--f-mono); padding: 6px 10px; border-radius: 999px; background: var(--sunken); color: var(--ink-2); border: 1px solid var(--line); }
.pill.good { background: var(--good-soft); color: var(--good); border-color: transparent; }
.pill.accent { background: var(--accent-soft); color: var(--accent); border-color: var(--accent-line); }
.bench { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 16px; align-items: start; }
.bench.form { grid-template-columns: minmax(0, 1fr); max-width: 760px; }
@media (max-width: 920px) { .bench { grid-template-columns: minmax(0, 1fr); } }
.panel { border: 1px solid var(--line); border-radius: var(--r-lg); background: var(--surface); min-width: 0; }
.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 14px 18px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
.panel-head h2 { font-size: 15px; letter-spacing: -0.01em; display: flex; align-items: center; gap: 10px; }
.panel-head h2 .n { font: 500 11px/1 var(--f-mono); color: var(--muted); background: var(--sunken); padding: 4px 7px; border-radius: 6px; letter-spacing: .04em; }
.panel-body { padding: 16px 18px 18px; display: grid; gap: 14px; }
.data-actions { display: flex; flex-wrap: wrap; gap: 6px; }
textarea.data { width: 100%; min-height: 168px; resize: vertical; font: 12.5px/1.55 var(--f-mono); color: var(--ink); background: var(--sunken); border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; tab-size: 12; white-space: pre; overflow: auto; }
textarea.data:focus { outline: none; box-shadow: var(--ring); border-color: var(--accent); background: var(--surface); }
.drop { border: 1px dashed var(--line-2); border-radius: 10px; padding: 10px 12px; font-size: 13px; color: var(--muted); display: flex; gap: 10px; align-items: center; justify-content: space-between; flex-wrap: wrap; }
.drop.over { border-color: var(--accent); background: var(--accent-soft); }
.data-status { font-size: 13px; color: var(--muted); display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.badge { font: 500 11px/1 var(--f-mono); padding: 4px 8px; border-radius: 6px; letter-spacing: .03em; }
.badge.sample { background: var(--warn-soft); color: var(--warn); }
.badge.own { background: var(--good-soft); color: var(--good); }
.preview { overflow-x: auto; border: 1px solid var(--line); border-radius: 10px; max-height: 220px; }
.preview table { border-collapse: collapse; font-size: 12.5px; width: 100%; font-variant-numeric: tabular-nums; }
.preview th, .preview td { padding: 6px 10px; border-bottom: 1px solid var(--line); text-align: left; white-space: nowrap; }
.preview th { position: sticky; top: 0; background: var(--sunken); font-weight: 500; color: var(--ink-2); }
.preview th small { display: block; font: 500 10px/1.2 var(--f-mono); color: var(--muted); letter-spacing: .04em; }
.preview td.num { text-align: right; font-family: var(--f-mono); font-size: 12px; }
.fields { display: grid; gap: 14px; }
.field { display: grid; gap: 6px; min-width: 0; }
.field > label, .field > .lab { font-size: 13px; font-weight: 500; color: var(--ink-2); display: flex; justify-content: space-between; gap: 8px; }
.field > label small, .field > .lab small { font-weight: 400; color: var(--muted); }
.field select, .field input[type="number"], .field input[type="text"] { width: 100%; font: 14px/1.3 var(--f-sans); color: var(--ink); background: var(--surface); border: 1px solid var(--line-2); border-radius: 9px; padding: 9px 11px; }
.field select:focus, .field input:focus { outline: none; box-shadow: var(--ring); border-color: var(--accent); }
.field-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 12px; }
.vchips { display: flex; flex-wrap: wrap; gap: 6px; max-height: 180px; overflow: auto; padding: 2px; }
.vchip { font: 500 12.5px/1 var(--f-sans); padding: 7px 10px; border-radius: 8px; border: 1px solid var(--line-2); background: var(--surface); color: var(--ink-2); cursor: pointer; }
.vchip[aria-pressed="true"] { background: var(--accent-soft); border-color: var(--accent); color: var(--accent); }
.vchip[disabled] { opacity: .35; cursor: not-allowed; }
.check { display: flex; gap: 8px; align-items: center; font-size: 13.5px; color: var(--ink-2); cursor: pointer; }
.check input { accent-color: var(--accent); width: 16px; height: 16px; }
.run-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; padding-top: 4px; }
.run-row .muted { font-size: 12.5px; }

/* results */
.results { margin-top: 28px; display: grid; gap: 18px; }
.results-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding-bottom: 6px; border-bottom: 1.5px solid var(--ink); }
.results-head h2 { font-size: 22px; letter-spacing: -0.025em; }
.results-head span { font: 500 12px/1 var(--f-mono); color: var(--muted); }
.rgrid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 18px; align-items: start; }
@media (max-width: 920px) { .rgrid { grid-template-columns: minmax(0, 1fr); } }
.rblock { min-width: 0; display: grid; gap: 8px; align-content: start; }
.rblock.wide { grid-column: 1 / -1; }
.rblock-head { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.rblock-head h3 { font-size: 15px; letter-spacing: -0.01em; }
.rblock-head .tno { font: 500 11px/1 var(--f-mono); color: var(--muted); letter-spacing: .06em; text-transform: uppercase; display: block; margin-bottom: 5px; }
.apa-wrap { overflow-x: auto; }
table.apa { border-collapse: collapse; width: 100%; font-size: 13.5px; font-variant-numeric: tabular-nums; border-top: 1.5px solid var(--ink); border-bottom: 1.5px solid var(--ink); }
table.apa th { font-weight: 500; text-align: right; padding: 8px 10px; border-bottom: 1px solid var(--ink); color: var(--ink); white-space: nowrap; }
table.apa td { text-align: right; padding: 6px 10px; color: var(--ink-2); white-space: nowrap; font-family: var(--f-mono); font-size: 12.5px; }
table.apa th:first-child, table.apa td:first-child { text-align: left; font-family: var(--f-sans); font-size: 13.5px; color: var(--ink); padding-left: 2px; }
table.apa tbody tr:hover td { background: var(--sunken); }
table.apa td.sig { color: var(--accent); font-weight: 600; }
table.apa td.hi { color: var(--ink); font-weight: 600; }
table.apa td.txt { font-family: var(--f-sans); font-size: 13px; text-align: left; white-space: normal; }
table.apa tr.sep td { border-top: 1px solid var(--line); }
.tnote { font-size: 12.5px; color: var(--muted); line-height: 1.5; }
.tnote i { font-style: italic; }
.interp { border: 1px solid var(--accent-line); background: var(--accent-soft); border-radius: 12px; padding: 16px 18px; display: grid; gap: 10px; }
.interp h3 { font-size: 14px; display: flex; align-items: center; gap: 8px; }
.interp p { color: var(--ink-2); font-size: 14.5px; line-height: 1.65; }
.interp .apa-text { background: var(--surface); border: 1px solid var(--line); border-radius: 9px; padding: 10px 12px; font-size: 14px; color: var(--ink); display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; }
.interp .apa-text span { flex: 1; min-width: 0; }
.notice { border-radius: 10px; padding: 11px 14px; font-size: 13.5px; line-height: 1.55; }
.notice.warn { background: var(--warn-soft); color: var(--warn); }
.notice.bad { background: var(--bad-soft); color: var(--bad); }
.notice.good { background: var(--good-soft); color: var(--good); }
.chart-box { border: 1px solid var(--line); border-radius: 12px; padding: 12px; background: var(--surface); position: relative; }
.chart-box .cv { position: relative; height: 290px; }
.chart-box svg text { fill: var(--ink-2); }
.stat-tiles { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.stat-tiles div { background: var(--surface); padding: 14px 16px; display: grid; gap: 4px; }
.stat-tiles b { font: 600 22px/1.1 var(--f-sans); letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.stat-tiles span { font-size: 12.5px; color: var(--muted); }
.stat-tiles b.good { color: var(--good); } .stat-tiles b.bad { color: var(--bad); } .stat-tiles b.accent { color: var(--accent); }

/* about the test */
.about { margin-top: 56px; display: grid; grid-template-columns: 220px minmax(0, 720px); gap: 48px; padding-top: 40px; border-top: 1px solid var(--line); }
@media (max-width: 960px) { .about { grid-template-columns: minmax(0, 1fr); gap: 16px; } }
.about aside b { font: 500 12px/1 var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.prose { font-size: 16px; line-height: 1.72; color: var(--ink-2); min-width: 0; display: grid; gap: 16px; }
.prose h2 { font-size: 22px; color: var(--ink); letter-spacing: -0.02em; margin-top: 12px; }
.prose h3 { font-size: 17px; color: var(--ink); margin-top: 6px; }
.prose ul { padding-left: 20px; margin: 0; display: grid; gap: 6px; }
.prose strong { color: var(--ink); font-weight: 600; }
.related { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; margin-top: 8px; }
.related a { border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; text-decoration: none; color: var(--ink); background: var(--surface); display: grid; gap: 4px; font-weight: 500; }
.related a:hover { border-color: var(--line-2); }
.related a span { color: var(--muted); font-size: 13px; font-weight: 400; }

.toast { position: fixed; left: 50%; bottom: calc(24px + env(safe-area-inset-bottom, 0px)); transform: translateX(-50%) translateY(20px); background: var(--ink); color: var(--bg); padding: 10px 16px; border-radius: 10px; font-size: 13.5px; opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 60; }
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.spin { width: 14px; height: 14px; border-radius: 50%; border: 2px solid var(--line-2); border-top-color: var(--accent); animation: sp .7s linear infinite; display: inline-block; }
@keyframes sp { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; } }
.steps-list { margin: 0; padding-left: 22px; display: grid; gap: 8px; }
.cat-links { font-size: 14.5px; line-height: 2; }
.cat-links a, a.cat-link { color: inherit; text-decoration: none; }
.cat-links a { color: var(--accent); }
a.cat-link:hover { color: var(--accent); }
.tool-faq { border-top: 1px solid var(--line); }
.tool-faq summary { font-size: 16px; padding-block: 16px; }
.cat-hero { padding-block: 28px 32px; max-width: 760px; }
.cat-hero h1 { font-size: clamp(30px, 4.2vw, 46px); letter-spacing: -0.035em; line-height: 1.06; margin-top: 12px; }
.updated { font: 500 12px/1 var(--f-mono); color: var(--muted); margin-top: 16px; display: block; }
.skip { position: absolute; left: -9999px; top: 8px; background: var(--ink); color: var(--bg); padding: 8px 12px; border-radius: 8px; z-index: 100; }
.skip:focus { left: 12px; }
.popular { padding-block: 0 40px; }
.pop-links { display: flex; flex-wrap: wrap; gap: 8px; }
.pop-links a { font-size: 14px; padding: 8px 13px; border: 1px solid var(--line); border-radius: 999px; color: var(--ink-2); text-decoration: none; background: var(--surface); }
.pop-links a:hover { border-color: var(--accent); color: var(--accent); }
.compare td a { color: var(--accent); font-weight: 500; text-decoration: none; }
.compare td a:hover { text-decoration: underline; }

textarea.code-in { width: 100%; resize: vertical; font: 12.5px/1.6 var(--f-mono); color: var(--ink); background: var(--sunken); border: 1px solid var(--line); border-radius: 9px; padding: 10px 12px; tab-size: 2; white-space: pre; overflow: auto; }
textarea.code-in:focus { outline: none; box-shadow: var(--ring); border-color: var(--accent); background: var(--surface); }
.fit-good { color: var(--good) !important; } .fit-bad { color: var(--bad) !important; } .fit-warn { color: var(--warn) !important; }
.ad-slot { display: none; }
.ads-on .ad-slot.filled { display: block; margin: 36px auto 8px; text-align: center; min-height: 100px; }
.ad-slot .ad-label { display: block; font: 500 10.5px/1 var(--f-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); margin-bottom: 6px; }
/* ---------- data cleaning app ---------- */
.custom-app { margin-top: 4px; }
.dc { display: grid; gap: 14px; }
.dc-bar { display: flex; justify-content: space-between; align-items: center; gap: 10px; flex-wrap: wrap; }
.dc-title { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; font-size: 15px; }
.dc-acts, .dc-mini { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.dc-tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--line); overflow-x: auto; }
.dc-tab { border: 0; background: transparent; color: var(--muted); font: 500 14px/1 var(--f-sans); padding: 11px 13px; border-bottom: 2px solid transparent; cursor: pointer; white-space: nowrap; display: inline-flex; gap: 6px; align-items: center; }
.dc-tab:hover { color: var(--ink); }
.dc-tab[aria-selected="true"] { color: var(--ink); border-bottom-color: var(--accent); }
.dc-count { font: 600 11px/1 var(--f-mono); background: var(--warn-soft); color: var(--warn); padding: 3px 6px; border-radius: 99px; }
.dc-tools { display: flex; gap: 14px; align-items: center; flex-wrap: wrap; margin-bottom: 10px; }
.dc-pager { margin-left: auto; display: inline-flex; gap: 8px; align-items: center; }
.dc-grid { max-height: 560px; }
.dc-grid td.dc-miss { background: var(--sunken); color: var(--muted); }
.dc-grid .dc-rn { color: var(--muted); font: 500 11px/1 var(--f-mono); text-align: right; background: var(--sunken); }
.dc-grid td[data-r] { cursor: cell; }
.dc-cell { width: 100%; min-width: 70px; font: 12.5px var(--f-mono); padding: 3px 5px; border: 1px solid var(--accent); border-radius: 5px; background: var(--surface); color: var(--ink); }
.dc-vars td { vertical-align: middle; }
.dc-in { font: 13px/1.2 var(--f-sans); color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 7px; padding: 6px 8px; width: 120px; }
.dc-in.wide { width: 220px; }
select.dc-in { width: auto; }
.dc-in:focus { outline: none; box-shadow: var(--ring); border-color: var(--accent); }
.dc-row-acts { white-space: nowrap; }
.dc-row-acts .btn { padding: 4px 6px; }
.dc-vedit td { background: var(--accent-soft); }
.dc-valbox { display: grid; gap: 8px; max-width: 520px; padding: 6px 0; }
.dc-issues { display: grid; gap: 8px; }
.dc-issue { display: flex; justify-content: space-between; gap: 12px; align-items: center; border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: 10px; padding: 10px 12px; font-size: 13.5px; background: var(--surface); }
.dc-issue.warn { border-left-color: var(--warn); }
.dc-issue .btn { flex: none; }
.dc-split { display: grid; grid-template-columns: 290px minmax(0, 1fr); gap: 16px; align-items: start; }
.dc-split.even { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
@media (max-width: 900px) { .dc-split, .dc-split.even { grid-template-columns: minmax(0, 1fr); } }
.dc-ops { display: grid; gap: 4px; max-height: 640px; overflow: auto; }
.dc-ops button { text-align: left; border: 1px solid transparent; background: transparent; border-radius: 10px; padding: 9px 11px; cursor: pointer; display: grid; gap: 3px; color: var(--ink); }
.dc-ops button b { font-weight: 600; font-size: 14px; }
.dc-ops button span { font-size: 12.5px; color: var(--muted); line-height: 1.4; }
.dc-ops button:hover { background: var(--sunken); }
.dc-ops button[aria-pressed="true"] { background: var(--accent-soft); border-color: var(--accent-line); }
.dc-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
.dc-card { border: 1px solid var(--line); border-radius: 12px; padding: 14px; background: var(--surface); display: grid; gap: 8px; align-content: start; min-width: 0; }
.dc-card-h { display: flex; justify-content: space-between; gap: 8px; align-items: center; }
.dc-card-h b { overflow-wrap: anywhere; }
.dc-kv { display: grid; grid-template-columns: auto 1fr; gap: 3px 12px; font-size: 13px; }
.dc-kv span { color: var(--muted); }
.dc-kv b { font-weight: 500; font-variant-numeric: tabular-nums; }
.dc-freq { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.dc-freq td { padding: 4px 0; border-top: 1px solid var(--line); }
.dc-freq td.num { text-align: right; font-family: var(--f-mono); padding-left: 8px; }
.dc-log { margin: 0 0 12px; padding-left: 22px; display: grid; gap: 6px; font-size: 13.5px; }
.dc-feat { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.dc-feat div { background: var(--surface); padding: 14px 16px; display: grid; gap: 4px; }
.dc-feat b { font-size: 14px; }
.dc-feat span { font-size: 13px; color: var(--muted); }
.dc > *, .dc-body, .dc-split > * { min-width: 0; }
.cite-tool { margin-top: 28px; border: 1px solid var(--accent-line); background: var(--accent-soft); border-radius: 14px; padding: 18px 20px; display: grid; gap: 14px; }
.cite-tool-head h2 { font-size: 17px; letter-spacing: -0.015em; }
.cite-tool-head p { color: var(--ink-2); font-size: 14px; margin-top: 4px; max-width: 80ch; }
.cite-tool .cite-box { background: var(--surface); }
.tool-banner { display: flex; flex-wrap: wrap; gap: 10px 16px; align-items: center; justify-content: space-between; border: 1px solid var(--accent-line); background: var(--accent-soft); border-radius: 12px; padding: 14px 16px; margin-bottom: 16px; font-size: 14.5px; color: var(--ink-2); }
.tool-banner .btn { flex: none; }