:root,
:root[data-theme="light"] {
  color-scheme: light;
  --bg: linear-gradient(180deg, #f9f2e4 0%, #efe4cf 100%);
  --glow-1: rgba(54, 145, 101, .2);
  --glow-2: rgba(220, 159, 88, .18);
  --text: #102118;
  --text-2: #4b6658;
  --accent: #13382b;
  --on-accent: #f7f1e6;
  --accent-hover: #1d7d52;
  --green: #1b6548;
  --chip: rgba(20, 107, 72, .12);
  --card: rgba(255, 255, 255, .72);
  --border: rgba(16, 33, 24, .09);
  --shadow: 0 24px 50px rgba(55, 48, 31, .08);
  --header: rgba(249, 242, 228, .86);
  --footer: #0b2e23;
  --footer-text: #cfe3d6;
  --final-btn-bg: #f7f1e6;
  --final-btn-bg-hover: #fff;
  --final-btn-text: #13382b;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: linear-gradient(180deg, #0e1815 0%, #14221d 52%, #0a120f 100%);
  --glow-1: rgba(44, 127, 89, .28);
  --glow-2: rgba(190, 122, 61, .2);
  --text: #ebf3ed;
  --text-2: #a6b9af;
  --accent: #2d8a5c;
  --on-accent: #f4fbf6;
  --accent-hover: #38a56f;
  --green: #b6f0cd;
  --chip: rgba(109, 215, 152, .16);
  --card: rgba(23, 32, 29, .88);
  --border: rgba(235, 243, 237, .1);
  --shadow: 0 24px 50px rgba(0, 0, 0, .3);
  --header: rgba(14, 24, 21, .86);
  --footer: #08100d;
  --footer-text: #a6b9af;
  --final-btn-bg: #f4fbf6;
  --final-btn-bg-hover: #fff;
  --final-btn-text: #13382b;
}

/* Изумруд: глубокий зелёный фон и золотой акцент */
:root[data-theme="emerald"] {
  color-scheme: dark;
  --bg: linear-gradient(180deg, #06392a 0%, #0a4a37 52%, #042a1f 100%);
  --glow-1: rgba(96, 214, 160, .24);
  --glow-2: rgba(226, 175, 84, .22);
  --text: #eaf6ee;
  --text-2: #a9cfbc;
  --accent: #d9a84a;
  --on-accent: #2a1d05;
  --accent-hover: #e8bd62;
  --green: #8fe3b5;
  --chip: rgba(143, 227, 181, .16);
  --card: rgba(7, 62, 45, .72);
  --border: rgba(200, 240, 220, .16);
  --shadow: 0 24px 50px rgba(0, 20, 12, .38);
  --header: rgba(5, 52, 38, .88);
  --footer: #031f17;
  --footer-text: #a9cfbc;
  --final-btn-bg: #06392a;
  --final-btn-bg-hover: #0a4a37;
  --final-btn-text: #f1deb0;
}

/* Без JS тема берётся из настроек системы */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --bg: linear-gradient(180deg, #0e1815 0%, #14221d 52%, #0a120f 100%);
    --glow-1: rgba(44, 127, 89, .28);
    --glow-2: rgba(190, 122, 61, .2);
    --text: #ebf3ed;
    --text-2: #a6b9af;
    --accent: #2d8a5c;
    --on-accent: #f4fbf6;
    --accent-hover: #38a56f;
    --green: #b6f0cd;
    --chip: rgba(109, 215, 152, .16);
    --card: rgba(23, 32, 29, .88);
    --border: rgba(235, 243, 237, .1);
    --shadow: 0 24px 50px rgba(0, 0, 0, .3);
    --header: rgba(14, 24, 21, .86);
    --footer: #08100d;
    --footer-text: #a6b9af;
    --final-btn-bg: #f4fbf6;
    --final-btn-bg-hover: #fff;
    --final-btn-text: #13382b;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 76px; }

body {
  margin: 0;
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  color: var(--text);
  background:
    radial-gradient(circle at top left, var(--glow-1), transparent 30%),
    radial-gradient(circle at top right, var(--glow-2), transparent 26%),
    var(--bg);
  background-attachment: fixed;
  -webkit-text-size-adjust: 100%;
}

h1, h2, h3, p { margin: 0; }

a { color: inherit; }

img, svg { display: block; max-width: 100%; }

.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 16px; }

.icon { width: 24px; height: 24px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: none; }

/* Кнопки-ссылки */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 46px; padding: 0 22px;
  border-radius: 14px; border: 1px solid transparent;
  font-weight: 650; font-size: 1rem; text-decoration: none; text-align: center;
  background: var(--accent); color: var(--on-accent);
  transition: background .15s, transform .15s;
}
.btn:hover { background: var(--accent-hover); }
.btn:active { transform: translateY(1px); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--chip); }
.btn-sm { min-height: 40px; padding: 0 16px; font-size: .95rem; }

:focus-visible { outline: 3px solid var(--accent-hover); outline-offset: 3px; border-radius: 6px; }

/* Шапка */
.site-header {
  position: sticky; top: 0; z-index: 10;
  background: var(--header);
  -webkit-backdrop-filter: blur(12px); backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.bar { display: flex; align-items: center; justify-content: space-between; gap: 12px; min-height: 64px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 750; font-size: 1.1rem; text-decoration: none; }
.bar nav { display: flex; align-items: center; gap: 6px; }
.bar nav a:not(.btn) { padding: 10px 12px; text-decoration: none; color: var(--text-2); font-weight: 550; border-radius: 10px; }
.bar nav a:not(.btn):hover { color: var(--text); background: var(--chip); }

/* Язык и тема */
.tools { display: flex; align-items: center; gap: 10px; margin-left: auto; margin-right: 4px; }
.langs, .themes { display: inline-flex; gap: 2px; padding: 3px; border-radius: 12px; border: 1px solid var(--border); background: var(--card); }
.langs a { padding: 5px 9px; border-radius: 9px; font-size: .8rem; font-weight: 700; text-decoration: none; color: var(--text-2); }
.langs a:hover { color: var(--text); background: var(--chip); }
.langs a[aria-current="true"] { background: var(--accent); color: var(--on-accent); }
.themes button { display: grid; place-items: center; width: 32px; height: 30px; padding: 0; border: 0; border-radius: 9px; background: transparent; color: var(--text-2); cursor: pointer; }
.themes button:hover { color: var(--text); background: var(--chip); }
.themes button[aria-pressed="true"] { background: var(--accent); color: var(--on-accent); }
.themes .icon { width: 17px; height: 17px; }


footer { margin-top: 32px; padding: 32px 0 calc(32px + env(safe-area-inset-bottom)); background: var(--footer); color: var(--footer-text); font-size: .95rem; }
footer .row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px 24px; }
footer nav { display: flex; flex-wrap: wrap; gap: 8px 20px; }
footer a { text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* Статьи */
.bar nav { margin-left: 0; }
.bar nav a.nav-link { padding: 10px 12px; text-decoration: none; color: var(--text-2); font-weight: 550; border-radius: 10px; }
.bar nav a.nav-link:hover { color: var(--text); background: var(--chip); }
.crumbs { padding-top: 28px; font-size: .9rem; color: var(--text-2); }
.crumbs a { color: var(--green); text-decoration: none; font-weight: 600; }
.crumbs a:hover { text-decoration: underline; }
.article { max-width: 720px; padding-bottom: 24px; }
.article h1 { margin-top: 14px; font-size: clamp(1.7rem, 6vw, 2.6rem); overflow-wrap: break-word; }
.article .meta { margin-top: 14px; font-size: .9rem; color: var(--text-2); }
.prose { margin-top: 28px; font-size: 1.0625rem; line-height: 1.7; overflow-wrap: break-word; }
.prose > * + * { margin-top: 1em; }
.prose h2 { margin-top: 2em; font-size: clamp(1.3rem, 4.4vw, 1.65rem); line-height: 1.25; }
.prose h2 + * { margin-top: .6em; }
.prose p, .prose li { color: var(--text); }
.prose ul, .prose ol { padding-left: 1.4em; }
.prose li + li { margin-top: .45em; }
.prose strong { font-weight: 700; }
.prose a { color: var(--green); font-weight: 600; }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; border-radius: 14px; border: 1px solid var(--border); background: var(--card); }
.prose table { width: 100%; border-collapse: collapse; font-size: .95rem; font-variant-numeric: tabular-nums; }
.prose th, .prose td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
.prose td.num { white-space: nowrap; }
.prose th { color: var(--text-2); font-weight: 650; font-size: .85rem; }
.prose tr:last-child td { border-bottom: 0; }
.cta-card { margin-top: 40px; padding: 24px; border-radius: 22px; background: var(--card); border: 1px solid var(--border); box-shadow: var(--shadow); }
.cta-card h2 { font-size: 1.25rem; }
.cta-card p { margin-top: 8px; color: var(--text-2); }
.cta-card .cta-row { margin-top: 18px; }
.more { margin-top: 40px; }
.more h2 { font-size: 1.2rem; }
.more ul { list-style: none; margin: 14px 0 0; padding: 0; display: grid; gap: 10px; }
.more a { display: block; padding: 14px 16px; border-radius: 16px; background: var(--card); border: 1px solid var(--border); text-decoration: none; font-weight: 650; }
.more a:hover { background: var(--chip); }
.list { display: grid; gap: 14px; margin-top: 28px; }
.list a.card { display: block; text-decoration: none; transition: transform .15s; }
.list a.card:hover { transform: translateY(-2px); }
.list a.card h2 { font-size: 1.2rem; line-height: 1.3; }
.list a.card .more-link { display: inline-block; margin-top: 12px; color: var(--green); font-weight: 650; }
.index-head { padding-top: 24px; max-width: 720px; }
.index-head p { margin-top: 14px; color: var(--text-2); font-size: 1.1rem; }
main { padding-bottom: 24px; }

@media (max-width: 640px) {
  .bar nav a.nav-link, .bar nav .btn { display: none; }
  .tools { margin-right: 0; }
  .cta-row .btn { flex: 1 1 100%; }
}

@media (min-width: 760px) {
  .list { grid-template-columns: repeat(2, 1fr); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}
.article .lead { margin-top: 18px; font-size: 1.15rem; line-height: 1.55; color: var(--text-2); }
.article h1, .index-head h1 { line-height: 1.15; letter-spacing: -.02em; font-weight: 800; }
.brand span { white-space: nowrap; }
@media (max-width: 420px) {
  .brand span { display: none; }
}

/* Тема приложения: зелёная плита в шапке и жёлтое главное действие (как в /app/; тот же набор, что в index.html) */
:root { --slab: #1f7a50; --slab-soft: #e3f3ea; --yellow: #f6c434; --yellow-hover: #fad04f; --yellow-text: #2a1d05; }
:root[data-theme="dark"] { --slab: #1d5f45; --slab-soft: #cfe8da; --yellow: #f3c63f; --yellow-hover: #f8d462; }
:root[data-theme="emerald"] { --slab: #0f6b4d; --slab-soft: #d3ecdf; --yellow: #f5c64a; --yellow-hover: #f9d46e; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) { --slab: #1d5f45; --slab-soft: #cfe8da; --yellow: #f3c63f; --yellow-hover: #f8d462; }
}
.site-header { background: var(--slab); color: #fff; border-bottom: 0; border-radius: 0 0 22px 22px; box-shadow: 0 6px 18px rgba(16, 40, 28, .2); -webkit-backdrop-filter: none; backdrop-filter: none; }
.site-header .brand { color: #fff; white-space: nowrap; }
.site-header .bar nav a:not(.btn), .site-header .bar nav a.nav-link { color: var(--slab-soft); }
.site-header .bar nav a:not(.btn):hover, .site-header .bar nav a.nav-link:hover { color: #fff; background: rgba(255, 255, 255, .14); }
.site-header .btn-ghost { color: #fff; border-color: rgba(255, 255, 255, .4); }
.site-header .btn-ghost:hover { background: rgba(255, 255, 255, .14); }
.site-header :focus-visible { outline-color: var(--yellow); }
.langs, .themes { background: rgba(255, 255, 255, .14); border-color: rgba(255, 255, 255, .28); }
.langs a, .themes button { color: var(--slab-soft); }
.langs a:hover, .themes button:hover { color: #fff; background: rgba(255, 255, 255, .16); }
.langs a[aria-current="true"], .themes button[aria-pressed="true"] { background: var(--yellow); color: var(--yellow-text); }
.btn:not(.btn-ghost) { background: var(--yellow); color: var(--yellow-text); }
.btn:not(.btn-ghost):hover { background: var(--yellow-hover); }
:root:not([data-theme="dark"]):not([data-theme="emerald"]) .btn:not(.btn-ghost) { border-color: #b98a06; }
.final { background: var(--slab); color: #fff; }
.final .btn { background: var(--yellow); color: var(--yellow-text); }
@media (max-width: 900px) {
  .bar nav a.nav-link { display: none; }
}
@media (max-width: 640px) {
  .bar nav { display: none; }
  .bar { gap: 8px; }
  .wrap { padding: 0 12px; }
  .brand { gap: 8px; font-size: 1rem; }
  .brand img { width: 28px; height: 28px; }
  .tools { gap: 6px; }
  .langs a { padding: 6px 7px; font-size: .78rem; }
  .themes button { width: 30px; height: 32px; }
}
@media (max-width: 370px) {
  .brand span { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
}