:root {
  color-scheme: light;
  --bg: #fcfcfc;
  --bg-elev: #ffffff;
  --bg-mute: #f5f5f9;
  --ink: #222222;
  --ink-2: #374151;
  --mute: #64748b;
  --line: #eaecef;
  --line-strong: #d1d9e1;
  --accent: #4f46e5;
  --accent-2: #4338ca;
  --accent-soft: #eef2ff;
  --accent-ink: #ffffff;
  --ok: #70b166;
  --err: #dc3545;
  --blue: #1a73e8;
  --form: #f0f4f9;
  --shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  --radius: 10px;
  --wrap: 1280px;
  --font: Inter, Arial, system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0f1220;
  --bg-elev: #171a2b;
  --bg-mute: #1a1a2e;
  --ink: #e8eaf4;
  --ink-2: #c5c9d8;
  --mute: #94a3b8;
  --line: #2a2e44;
  --line-strong: #3b415c;
  --accent: #818cf8;
  --accent-2: #a5b4fc;
  --accent-soft: rgba(79, 70, 229, 0.22);
  --accent-ink: #0f1220;
  --ok: #86c97c;
  --err: #f26c63;
  --blue: #4ea3ff;
  --form: #141728;
  --shadow: 0 2px 8px rgba(0, 0, 0, 0.35);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.4;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: 0; padding: 0; }
img, svg { max-width: 100%; display: block; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.skip {
  position: absolute; left: 1rem; top: -4rem;
  background: var(--ink); color: var(--bg); padding: 0.5rem 0.8rem; z-index: 80;
}
.skip:focus { top: 0.8rem; }

.wrap {
  width: min(var(--wrap), calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  background: var(--bg-elev);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 50;
}
.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 1rem;
}
.logo {
  font-weight: 700;
  font-size: 1.55rem;
  letter-spacing: -0.04em;
  color: var(--ink);
  text-decoration: none;
}
.logo:hover { color: var(--ink); }
.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem 1.1rem;
  font-size: 0.92rem;
}
.nav a { color: var(--ink-2); }
.nav a:hover { color: var(--accent); }
.bar-actions { display: flex; align-items: center; gap: 0.5rem; margin-left: auto; }
.search-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 8px 16px;
  border-radius: var(--radius);
  background: #f5f5f5;
  color: #1e293b;
  text-decoration: none;
  font-size: 0.95rem;
}
[data-theme="dark"] .search-btn { background: var(--bg-mute); color: var(--ink); }
.search-btn:hover { color: inherit; filter: brightness(0.97); }
.icon-btn, .menu {
  width: 38px; height: 38px;
  display: grid; place-items: center;
  border-radius: var(--radius);
  color: var(--ink-2);
  background: #f5f5f5;
}
[data-theme="dark"] .icon-btn,
[data-theme="dark"] .menu { background: var(--bg-mute); }
.icon-btn:hover, .menu:hover { filter: brightness(0.96); }
.menu { display: none; }
.kbd-hint { display: none; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 42px;
  padding: 0 1.1rem;
  border-radius: 6px;
  font-weight: 500;
  text-decoration: none;
  border: 0;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: #1557b0; color: #fff; }
.btn-ghost { background: #fff; color: #1a1a1a; border: 1px solid #e0e0e0; }
[data-theme="dark"] .btn-ghost { background: var(--bg-elev); color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { color: inherit; }

.home-hero { text-align: center; padding: 3rem 0 0.5rem; }
.home-hero h1 {
  font-size: clamp(1.7rem, 4vw, 2.5rem);
  font-weight: 200;
  color: #0f172a;
  max-width: 18em;
  margin: 0 auto 1.25rem;
  line-height: 1.25;
}
[data-theme="dark"] .home-hero h1 { color: var(--ink); }
.lede {
  max-width: 800px;
  margin: 0 auto 2.5rem;
  color: var(--ink-2);
  font-size: 1.05rem;
}

.sci {
  width: 100%;
  max-width: 640px;
  margin: 0 auto 3rem;
  background: var(--bg-mute);
  border-radius: 16px;
  padding: 1rem;
  font-family: Arial, system-ui, sans-serif;
}
.sci-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.35rem;
}
.sci-brand { font-size: 0.8rem; color: var(--mute); font-weight: 600; }
.sci-mode {
  display: flex;
  border-radius: 10px;
  overflow: hidden;
  background: rgba(0,0,0,.06);
}
.sci-mode button {
  padding: 0.3rem 0.7rem;
  font-size: 0.75rem;
  color: #555;
}
.sci-mode button.on {
  background: #fff;
  color: #111;
  box-shadow: 0 1px 3px rgba(0,0,0,.12);
}
[data-theme="dark"] .sci-mode button.on { background: #2a2a3e; color: #fff; }
.sci-expr { min-height: 1.1em; color: #636363; font-size: 0.9em; text-align: right; }
.sci-display {
  width: 100%;
  border: 0;
  background: transparent;
  text-align: right;
  font-size: 2.2rem;
  font-weight: 300;
  line-height: 1.2;
  padding: 0.15rem 0.25rem 0.7rem;
  outline: none;
  color: var(--ink);
}
.sci-err { color: var(--err); font-size: 0.85rem; min-height: 1.1rem; }
.sci-keys {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.45rem;
}
.sci-keys button {
  padding: 0.8rem 0.4rem;
  border-radius: 10px;
  font-size: 1.05rem;
  background: #fff;
  color: #111;
  box-shadow: 0 1px 3px rgba(0,0,0,.12);
}
.sci-keys button:active { transform: scale(0.92); }
.sci-keys .fn { background: #dce8ff; color: #111; font-size: 0.9rem; box-shadow: none; }
.sci-keys .op { background: #dce8ff; color: #111; box-shadow: none; }
.sci-keys .eq { background: #1a73e8; color: #fff; grid-column: span 2; box-shadow: none; }
.sci-keys [data-sci="ce"] { background: #fde2e2; color: #111; }
.sci-keys [data-sci="ac"] { background: #fde2e2; color: #111; }
[data-theme="dark"] .sci-keys button { background: #2a2a3e; color: #fff; box-shadow: none; }
[data-theme="dark"] .sci-keys .fn,
[data-theme="dark"] .sci-keys .op { background: #1e3a6e; color: #7eb3ff; }
[data-theme="dark"] .sci-keys .eq { background: #1a73e8; color: #fff; }
[data-theme="dark"] .sci-keys [data-sci="ce"],
[data-theme="dark"] .sci-keys [data-sci="ac"] { background: #5a2a2a; color: #ffb4b4; }

.categories-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding-bottom: 3.5rem;
}
.category-wrapper {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px 28px 28px;
  scroll-margin-top: 80px;
}
.category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.2rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid #f0f0f0;
}
[data-theme="dark"] .category-header { border-bottom-color: var(--line); }
.category-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: #1a1f2e;
  letter-spacing: -0.01em;
  margin: 0;
}
[data-theme="dark"] .category-title { color: var(--ink); }
.category-count {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 20px;
  padding: 2px 10px;
}
.category-items {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.category-items a {
  display: block;
  color: #374151;
  padding: 4px 6px;
  border-radius: 5px;
  font-size: 1rem;
}
.category-items a:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.page-hero { padding: 1.8rem 0 1.2rem; }
.page-hero h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  font-weight: 300;
  margin: 0 0 0.5rem;
  color: #0f172a;
  max-width: 40rem;
}
[data-theme="dark"] .page-hero h1 { color: var(--ink); }
.page-hero p { margin: 0; max-width: 40rem; color: var(--mute); }
.crumbs { font-size: 0.9rem; margin-bottom: 0.7rem; }
.crumbs ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.35rem; }
.crumbs a { color: var(--mute); }
.crumbs a:hover { color: var(--accent); }

.calc-kicker {
  font-size: 1.05rem;
  font-weight: 600;
  margin: 0 0 0.75rem;
}
.seo-article {
  max-width: 46rem;
  padding: 0 0 3.5rem;
  color: var(--ink-2);
}
.seo-article h2 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--ink);
  margin: 1.8rem 0 0.7rem;
}
.seo-article h3 {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--ink);
  margin: 1.15rem 0 0.4rem;
}
.seo-article p { margin: 0 0 0.75rem; line-height: 1.55; }
.seo-article a { color: var(--accent); }
.seo-links { margin: 0; padding-left: 1.15rem; }
.seo-links li { margin: 0.35rem 0; }
.home-seo { max-width: 46rem; margin: 0 auto 3rem; color: var(--ink-2); }
.home-seo h2 { color: var(--ink); font-weight: 600; font-size: 1.25rem; margin: 1.6rem 0 0.6rem; }
.home-seo p { margin: 0 0 0.75rem; line-height: 1.55; }

.calc-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1.25rem;
  padding-bottom: 2.5rem;
  align-items: start;
}
.panel {
  background: var(--form);
  border-radius: var(--radius);
  padding: 1.2rem 1.25rem 1.3rem;
  border: 1px solid var(--line);
}
.panel:last-child { background: var(--bg-elev); }
.panel h2 {
  margin: 0 0 1rem;
  font-size: 1.05rem;
  font-weight: 600;
}
.field { margin: 0 0 0.85rem; }
.field label { display: block; font-size: 0.9rem; font-weight: 500; margin: 0 0 0.28rem; }
.field .hint { display: block; color: var(--mute); font-size: 0.8rem; margin-top: 0.22rem; }
.field input[type="text"],
.field input[type="number"],
.field input[type="date"],
.field input[type="datetime-local"],
.field input[type="url"],
.field select,
.field textarea {
  width: 100%;
  height: 42px;
  padding: 0 0.75rem;
  border: 1px solid var(--line-strong);
  border-radius: 4px;
  background: var(--bg-elev);
}
.field textarea { height: auto; min-height: 8rem; padding: 0.65rem 0.75rem; resize: vertical; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none;
  border-color: #2f6fed;
}
.check { display: flex; align-items: center; gap: 0.5rem; margin: 0 0 0.8rem; }
.check input { accent-color: var(--accent); }
.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 0.7rem; }
.kpis { display: grid; grid-template-columns: 1fr 1fr; gap: 0.65rem; margin-bottom: 1rem; }
.kpi {
  background: var(--accent-soft);
  border-radius: 8px;
  padding: 0.8rem 0.9rem;
}
.kpi .l { font-size: 0.75rem; color: var(--accent); font-weight: 500; }
.kpi .v { font-size: 1.25rem; font-weight: 600; margin-top: 0.15rem; word-break: break-word; }
.table-wrap { overflow: auto; margin-top: 0.6rem; }
table.data { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
table.data th, table.data td {
  text-align: left; padding: 0.45rem 0.5rem; border-bottom: 1px solid var(--line); white-space: nowrap;
}
table.data th { font-size: 0.75rem; color: var(--mute); font-weight: 500; }
table.data td.num { font-family: var(--mono); text-align: right; }
.out-note { margin: 0.8rem 0 0; color: var(--mute); font-size: 0.92rem; }
.out-pre {
  margin: 0.6rem 0 0; padding: 0.85rem;
  background: var(--bg-mute); border-radius: 8px;
  white-space: pre-wrap; font-family: var(--mono); font-size: 0.85rem; overflow: auto;
}
.palette { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 0.45rem; }
.swatch { border: 1px solid var(--line); border-radius: 8px; overflow: hidden; background: var(--bg-elev); }
.swatch i { display: block; height: 42px; }
.swatch span { display: block; padding: 0.35rem 0.5rem; font-family: var(--mono); font-size: 0.72rem; }
.qr-box { display: grid; place-items: center; padding: 1rem; background: #fff; border-radius: 8px; }
.qr-box canvas { width: min(260px, 100%); height: auto; }
.breath {
  width: min(220px, 70vw);
  aspect-ratio: 1;
  margin: 0.6rem auto 0.4rem;
  border-radius: 50%;
  background: #dce8ff;
  animation: breath var(--dur, 8s) ease-in-out infinite;
}
[data-theme="dark"] .breath { background: #1e3a6e; }
@keyframes breath {
  0%, 100% { transform: scale(0.7); opacity: 0.7; }
  50% { transform: scale(1); opacity: 1; }
}
.related { display: flex; flex-wrap: wrap; gap: 0.4rem; margin: 0 0 3rem; }
.related a {
  color: var(--ink-2); border: 1px solid var(--line); border-radius: 20px;
  padding: 0.28rem 0.75rem; font-size: 0.88rem; background: var(--bg-elev);
}
.related a:hover { border-color: var(--accent); color: var(--accent); }
.err-text { color: var(--err); }

.search, .feedback {
  position: fixed; inset: 0; z-index: 70;
  background: rgba(15, 18, 32, 0.45);
  display: grid; place-items: start center;
  padding: 12vh 1rem 2rem;
}
.search[hidden], .feedback[hidden] { display: none; }
.search-panel, .feedback-panel {
  width: min(560px, 100%);
  background: var(--bg-elev);
  border-radius: 12px;
  box-shadow: 0 16px 40px rgba(0,0,0,.18);
  overflow: hidden;
}
.search-panel input {
  width: 100%; border: 0; background: transparent;
  padding: 1rem 1.15rem; outline: none; border-bottom: 1px solid var(--line); font-size: 17px;
}
.search-list { list-style: none; margin: 0; padding: 0.4rem; max-height: 50vh; overflow: auto; }
.search-list a { display: block; padding: 0.65rem 0.75rem; border-radius: 8px; color: inherit; }
.search-list a:hover, .search-list a.active { background: var(--accent-soft); color: var(--ink); }
.search-list small { display: block; color: var(--mute); }
.search-empty { padding: 1.2rem; color: var(--mute); }

.feedback { z-index: 72; }
.feedback-panel { position: relative; width: min(480px, 100%); padding: 1.3rem 1.25rem 1.35rem; overflow: visible; }
.feedback-panel h2 { margin: 0 2rem 1rem 0; font-size: 1.25rem; font-weight: 600; }
.feedback-close {
  position: absolute; top: 0.7rem; right: 0.7rem;
  width: 36px; height: 36px; color: var(--mute); font-size: 1.4rem;
}
.feedback-close:hover { color: var(--ink); }
.feedback-panel label { display: block; font-size: 0.9rem; font-weight: 500; margin: 0 0 0.3rem; }
.feedback-panel input[type="text"],
.feedback-panel textarea {
  width: 100%; margin: 0 0 0.85rem; padding: 0.65rem 0.75rem;
  border: 1px solid var(--line-strong); border-radius: 4px; background: var(--bg);
}
.feedback-panel textarea { min-height: 8rem; resize: vertical; }
.feedback-panel input:focus, .feedback-panel textarea:focus { outline: none; border-color: #2f6fed; }
.feedback-panel .hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.feedback-status { margin: 0 0 0.8rem; font-size: 0.95rem; }
.feedback-status.is-ok { color: var(--ok); }
.feedback-status.is-err { color: var(--err); }
.feedback-panel .btn { width: 100%; }

.site-footer {
  background: var(--bg-elev);
  box-shadow: 0 -2px 4px rgba(0,0,0,0.05);
  padding: 1.8rem 0 2rem;
  font-size: 0.93rem;
  color: var(--mute);
}
.foot { display: flex; flex-wrap: wrap; gap: 2rem; align-items: flex-start; }
.foot strong { display: block; color: var(--ink); margin-bottom: 0.5rem; }
.foot a, .foot .foot-feedback {
  display: block; color: #374151; padding: 0.18rem 0; text-align: left; font: inherit;
}
[data-theme="dark"] .foot a, [data-theme="dark"] .foot .foot-feedback { color: var(--ink-2); }
.foot a:hover, .foot .foot-feedback:hover { color: var(--accent); }
.foot .brand { font-weight: 700; color: var(--ink); font-size: 1.15rem; margin-bottom: 0.3rem; }
.copyline { margin-top: 1.4rem; font-size: 0.8rem; }

.notfound {
  min-height: 70vh; display: grid; place-content: center; text-align: center; padding: 4rem 1rem;
}
.notfound .kicker { color: var(--accent); font-weight: 600; letter-spacing: 0.08em; margin: 0 0 0.4rem; }
.notfound h1 { font-weight: 200; font-size: clamp(2rem, 6vw, 3.2rem); margin: 0; }

@media (max-width: 991px) {
  .categories-container { grid-template-columns: 1fr 1fr; }
  .calc-layout { grid-template-columns: 1fr; }
  .nav { display: none; }
}
@media (max-width: 640px) {
  .categories-container, .kpis, .row-2 { grid-template-columns: 1fr; }
  .sci-keys { grid-template-columns: repeat(4, 1fr); }
  .search-btn span { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .sci-keys button:active { transform: none; }
}