/* =========================================================
   GreenPlastic Design — styles.css
   Palette: forest green + lime + warm paper, amber highlights
   Mobile-first.
   ========================================================= */

:root {
    /* --- Forest (dark surfaces) --- */
    --forest-950:   #0b1f16;
    --forest-900:   #10291d;
    --forest-800:   #173a2a;
    --forest-700:   #1f4d38;
    --on-forest:    #eef5e6;
    --on-forest-mute: #a9bfae;

    /* --- Paper (reading surfaces) --- */
    --paper:        #f6f4ec;
    --paper-deep:   #ece8da;
    --surface:      #fffefa;
    --ink:          #13241b;
    --text:         #2e3a33;
    --muted:        #646f68;
    --faint:        #8f9a92;

    /* --- Accents --- */
    --lime:         #c6e45b;
    --lime-soft:    #eef6cf;
    --lime-ink:     #5d7a0f;
    --amber:        #e9a23b;
    --amber-soft:   #fbecd2;

    /* --- Lines & shadows --- */
    --line:         #e2ddcc;
    --line-strong:  #cfc8b2;
    --shadow-sm:    0 1px 0 rgba(19, 36, 27, .06);
    --shadow-md:    0 14px 30px -18px rgba(19, 36, 27, .35);

    /* --- Radii --- */
    --r-xs: 4px;
    --r-sm: 6px;
    --r-md: 10px;
    --r-lg: 18px;

    /* --- Type --- */
    --font-sans: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
    --font-serif: Georgia, "Times New Roman", "PT Serif", serif;

    /* --- Layout --- */
    --gutter: clamp(16px, 5vw, 36px);
    --container: 1200px;
    --header-h: 68px;
}

/* =========================================================
   Reset & base
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 18px); }
body, h1, h2, h3, h4, p, figure, blockquote, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg { max-width: 100%; display: block; }
img { height: auto; }

body {
    font-family: var(--font-sans);
    font-size: 17.5px;
    line-height: 1.75;
    color: var(--text);
    background: var(--paper);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

::selection { background: var(--lime); color: var(--ink); }

h1, h2, h3, h4 {
    color: var(--ink);
    font-weight: 700;
    line-height: 1.22;
    letter-spacing: -.01em;
    overflow-wrap: break-word;
}

a {
    color: var(--forest-700);
    text-decoration: none;
    transition: color .18s ease, background-color .18s ease, border-color .18s ease;
}
a:hover { color: var(--lime-ink); }
a:focus-visible, summary:focus-visible {
    outline: 2px solid var(--amber);
    outline-offset: 3px;
    border-radius: 3px;
}

/* =========================================================
   Header (light paper, underline nav)
   ========================================================= */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(246, 244, 236, .92);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--line);
}
.header-inner {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--gutter);
    min-height: var(--header-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.logo { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); }
.logo:hover { color: var(--ink); }
.logo img { width: 40px; height: 40px; flex: 0 0 auto; }
.logo-text { display: flex; flex-direction: column; line-height: 1; }
.logo-word { font-weight: 800; font-size: 19px; letter-spacing: -.02em; }
.logo-word b { color: var(--lime-ink); font-weight: 800; }
.logo-sub {
    margin-top: 4px;
    font-size: 10.5px;
    font-weight: 700;
    letter-spacing: .32em;
    text-transform: uppercase;
    color: var(--muted);
}

.main-nav { display: none; align-items: center; gap: 26px; }
.main-nav a {
    position: relative;
    padding: 6px 0;
    color: var(--text);
    font-size: 14.5px;
    font-weight: 600;
}
.main-nav a::after {
    content: "";
    position: absolute;
    left: 0; right: 0; bottom: 0;
    height: 3px;
    background: var(--lime);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform .2s ease;
}
.main-nav a:hover, .main-nav a[aria-current] { color: var(--ink); }
.main-nav a:hover::after, .main-nav a[aria-current]::after { transform: scaleX(1); }

/* mobile nav: horizontal scroll strip under header */
.mobile-nav {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 0 var(--gutter) 12px;
    scrollbar-width: none;
}
.mobile-nav::-webkit-scrollbar { display: none; }
.mobile-nav a {
    flex: 0 0 auto;
    padding: 5px 12px;
    border: 1px solid var(--line-strong);
    border-radius: var(--r-xs);
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    background: var(--surface);
}
.mobile-nav a[aria-current] { background: var(--forest-800); border-color: var(--forest-800); color: var(--on-forest); }

/* =========================================================
   Hero (light, editorial)
   ========================================================= */
.hero {
    position: relative;
    border-bottom: 1px solid var(--line);
    background:
        linear-gradient(var(--line) 1px, transparent 1px) 0 0 / 100% 48px,
        var(--paper);
    background-blend-mode: normal;
}
.hero::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(246,244,236,.55), var(--paper) 92%);
    pointer-events: none;
}
.hero-inner {
    position: relative;
    z-index: 1;
    max-width: var(--container);
    margin: 0 auto;
    padding: 36px var(--gutter) 48px;
}

.breadcrumbs {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin-bottom: 20px;
    font-size: 13px;
    color: var(--muted);
}
.breadcrumbs a { color: var(--muted); border-bottom: 1px solid var(--line-strong); }
.breadcrumbs a:hover { color: var(--ink); }
.breadcrumbs .sep { color: var(--faint); }

.kicker {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 18px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--forest-700);
}
.kicker::before {
    content: "";
    width: 28px;
    height: 10px;
    background: var(--lime);
    border-radius: 2px;
}

.article-title {
    max-width: 22ch;
    font-family: var(--font-serif);
    font-size: clamp(30px, 6.6vw, 58px);
    line-height: 1.08;
    font-weight: 700;
    letter-spacing: -.02em;
    color: var(--ink);
}

.hero-split {
    display: grid;
    gap: 28px;
    margin-top: 32px;
}
.lead {
    font-size: clamp(17px, 3.4vw, 19.5px);
    line-height: 1.7;
    color: var(--text);
    padding-left: 18px;
    border-left: 4px solid var(--lime);
}

.hero-visual {
    position: relative;
    margin: 0 10px 10px 0;
}
.hero-visual::before {
    content: "";
    position: absolute;
    inset: 10px -10px -10px 10px;
    background: var(--lime);
    border-radius: var(--r-md);
}
.hero-visual img {
    position: relative;
    width: 100%;
    aspect-ratio: 1200 / 630;
    object-fit: cover;
    border-radius: var(--r-md);
    border: 1px solid var(--forest-800);
}

/* =========================================================
   Layout
   ========================================================= */
main {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--gutter);
}
.home-main { padding-top: 40px; }
.layout { display: grid; gap: 28px; align-items: start; }

/* --- Table of contents: collapsible timeline --- */
.toc {
    background: var(--forest-900);
    color: var(--on-forest);
    border-radius: var(--r-md);
    padding: 4px 20px;
}
.toc summary {
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--lime);
}
.toc summary::-webkit-details-marker { display: none; }
.toc summary::after { content: "+"; font-size: 20px; line-height: 1; color: var(--on-forest-mute); }
.toc[open] summary::after { content: "–"; }
.toc ol {
    position: relative;
    margin: 0 0 16px;
    padding-left: 18px;
    border-left: 1px dashed rgba(198, 228, 91, .4);
}
.toc li { position: relative; }
.toc li::before {
    content: "";
    position: absolute;
    left: -23px;
    top: 13px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--forest-900);
    border: 2px solid var(--lime);
}
.toc a {
    display: block;
    padding: 6px 0;
    color: var(--on-forest-mute);
    font-size: 14.5px;
    line-height: 1.45;
}
.toc a:hover { color: #fff; }

/* =========================================================
   Article body
   ========================================================= */
.content-body { min-width: 0; max-width: 760px; counter-reset: sec; }
.content-body > * + * { margin-top: 20px; }
.content-body p { color: var(--text); }
.content-body a { text-decoration: underline; text-decoration-color: var(--lime); text-decoration-thickness: 3px; text-underline-offset: 2px; }

.content-body h2 {
    counter-increment: sec;
    position: relative;
    margin-top: 60px;
    padding-top: 22px;
    font-family: var(--font-serif);
    font-size: clamp(24px, 4.8vw, 32px);
    border-top: 1px solid var(--line-strong);
}
.content-body h2::before {
    content: "Раздел " counter(sec);
    display: block;
    margin-bottom: 8px;
    font-family: var(--font-sans);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: .2em;
    text-transform: uppercase;
    color: var(--lime-ink);
}
.content-body h3 { margin-top: 34px; font-size: clamp(19px, 3.8vw, 22px); }

/* --- Check list (bordered panel with ticks) --- */
.check-list {
    padding: 20px 22px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--r-md);
}
.check-list li {
    position: relative;
    padding: 12px 0 12px 38px;
    font-size: 16.5px;
    line-height: 1.6;
}
.check-list li + li { border-top: 1px dashed var(--line-strong); }
.check-list li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 14px;
    width: 24px;
    height: 24px;
    border-radius: var(--r-sm);
    background: var(--lime);
}
.check-list li::after {
    content: "";
    position: absolute;
    left: 8px;
    top: 18px;
    width: 7px;
    height: 12px;
    border: solid var(--forest-900);
    border-width: 0 2.5px 2.5px 0;
    transform: rotate(45deg);
}
.check-list strong { color: var(--ink); }

/* --- Arrow list (amber markers, airy) --- */
.arrow-list { display: grid; gap: 10px; }
.arrow-list li {
    position: relative;
    padding: 14px 18px 14px 50px;
    background: var(--amber-soft);
    border-radius: var(--r-md);
    font-size: 16.5px;
    line-height: 1.6;
}
.arrow-list li::before {
    content: "→";
    position: absolute;
    left: 18px;
    top: 13px;
    font-weight: 800;
    color: #b06e10;
}

/* --- Pillar list (numbered columns) --- */
.pillar-list { display: grid; gap: 14px; counter-reset: pillar; }
.pillar-list li {
    counter-increment: pillar;
    position: relative;
    padding: 54px 20px 20px;
    background: var(--forest-800);
    color: var(--on-forest);
    border-radius: var(--r-md);
    font-size: 16px;
    line-height: 1.6;
}
.pillar-list li::before {
    content: counter(pillar, decimal-leading-zero);
    position: absolute;
    top: 16px;
    left: 20px;
    font-family: var(--font-serif);
    font-size: 26px;
    font-weight: 700;
    line-height: 1;
    color: var(--lime);
}

/* --- Metric list (2x2 grid with big index) --- */
.metric-list { display: grid; gap: 12px; counter-reset: metric; }
.metric-list li {
    counter-increment: metric;
    position: relative;
    padding: 18px 20px 18px 74px;
    background: var(--surface);
    border: 1px solid var(--line);
    border-bottom: 3px solid var(--lime);
    border-radius: var(--r-md);
    font-size: 16px;
    line-height: 1.6;
}
.metric-list li::before {
    content: counter(metric);
    position: absolute;
    left: 18px;
    top: 16px;
    width: 40px;
    height: 40px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    border: 2px solid var(--forest-700);
    font-weight: 800;
    color: var(--forest-700);
}

/* --- Steps (inner pages) --- */
.steps { counter-reset: step; display: grid; gap: 0; border-left: 2px solid var(--lime); margin-left: 14px; }
.steps li {
    counter-increment: step;
    position: relative;
    padding: 4px 0 20px 30px;
}
.steps li:last-child { padding-bottom: 0; }
.steps li::before {
    content: counter(step);
    position: absolute;
    left: -15px;
    top: 2px;
    width: 28px;
    height: 28px;
    display: grid;
    place-items: center;
    border-radius: 50%;
    background: var(--forest-800);
    color: var(--lime);
    font-weight: 800;
    font-size: 14px;
}
.steps strong { color: var(--ink); }

/* --- Quote (paper card with big serif mark) --- */
blockquote {
    position: relative;
    margin-top: 36px !important;
    padding: 48px 26px 26px;
    background: var(--lime-soft);
    border-radius: 0 var(--r-lg) var(--r-lg) var(--r-lg);
    font-family: var(--font-serif);
    font-size: clamp(18px, 3.6vw, 21px);
    font-style: italic;
    line-height: 1.6;
}
blockquote::before {
    content: "“";
    position: absolute;
    top: -14px;
    left: 18px;
    font-size: 96px;
    line-height: 1;
    color: var(--forest-700);
    font-style: normal;
}
.content-body blockquote p { color: var(--ink); }

/* --- Closing note --- */
.summary-note {
    margin-top: 48px !important;
    padding: 26px 24px;
    background: var(--forest-900);
    border-radius: var(--r-lg);
    border-top: 6px solid var(--lime);
}
.content-body .summary-note p { color: var(--on-forest); }

/* --- Inner pages --- */
.hero--page .article-title { max-width: 26ch; font-size: clamp(28px, 5.6vw, 48px); }
.hero--page .lead { margin-top: 24px; max-width: 64ch; }
.page-main { padding-top: 40px; }
.page-main .content-body { margin: 0 auto; }
.updated { color: var(--muted); font-size: 14px; }

/* =========================================================
   Related cards
   ========================================================= */
.related-section { margin-top: 80px; padding-top: 30px; border-top: 2px solid var(--ink); }
.section-header { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 24px; }
.section-header h2 {
    font-family: var(--font-serif);
    font-size: clamp(24px, 4.6vw, 32px);
}
.section-header span { color: var(--muted); font-size: 14px; }

.cards-grid { display: grid; grid-template-columns: 1fr; gap: 0; counter-reset: card; }
.card {
    counter-increment: card;
    position: relative;
    display: grid;
    grid-template-columns: 56px minmax(0, 1fr);
    gap: 4px 16px;
    padding: 22px 6px;
    border-bottom: 1px solid var(--line-strong);
    transition: background-color .2s ease;
}
.card::before {
    content: counter(card, decimal-leading-zero);
    grid-row: span 3;
    font-family: var(--font-serif);
    font-size: 34px;
    font-weight: 700;
    line-height: 1;
    color: var(--line-strong);
    transition: color .2s ease;
}
.card:hover { background: var(--surface); }
.card:hover::before { color: var(--lime-ink); }
.tag {
    font-size: 11.5px;
    font-weight: 700;
    letter-spacing: .18em;
    text-transform: uppercase;
    color: var(--lime-ink);
}
.card h3 { font-size: 19px; line-height: 1.35; }
.card h3 a { color: var(--ink); }
.card h3 a::after { content: ""; position: absolute; inset: 0; }
.card p { font-size: 15px; line-height: 1.6; color: var(--muted); }
.card .more { margin-top: 6px; font-size: 13px; font-weight: 700; color: var(--forest-700); }

/* =========================================================
   Footer (forest)
   ========================================================= */
footer {
    margin-top: 80px;
    color: var(--on-forest-mute);
    background: var(--forest-950);
}
footer .logo, footer .logo:hover { color: var(--on-forest); }
footer .logo-word b { color: var(--lime); }
footer .logo-sub { color: var(--on-forest-mute); }
.footer-inner {
    max-width: var(--container);
    margin: 0 auto;
    padding: 48px var(--gutter) 30px;
    display: grid;
    gap: 34px;
}
.footer-brand { display: flex; flex-direction: column; gap: 14px; }
.footer-brand .slogan { max-width: 34ch; font-size: 15px; color: var(--on-forest-mute); }

.footer-col h3 {
    margin-bottom: 14px;
    color: var(--lime);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: .2em;
    text-transform: uppercase;
}
.footer-col li + li { margin-top: 9px; }
.footer-col a { color: var(--on-forest); font-size: 14.5px; }
.footer-col a:hover { color: var(--lime); }

.footer-bottom {
    max-width: var(--container);
    margin: 0 auto;
    padding: 18px var(--gutter) 30px;
    border-top: 1px solid rgba(255, 255, 255, .1);
}
.copy { color: var(--faint); font-size: 12.5px; }

/* =========================================================
   ≥ 640px
   ========================================================= */
@media (min-width: 640px) {
    .metric-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .pillar-list { grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .cards-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0 28px; }
    .card { grid-template-columns: 1fr; padding: 22px 0; border-bottom: 0; border-top: 1px solid var(--line-strong); }
    .card::before { grid-row: auto; margin-bottom: 10px; }
    .card:hover { background: transparent; }
    .cards-grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* =========================================================
   ≥ 900px
   ========================================================= */
@media (min-width: 900px) {
    .hero-inner { padding-top: 56px; padding-bottom: 64px; }
    .hero-split { grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr); gap: 52px; align-items: end; margin-top: 40px; }

    .layout { grid-template-columns: minmax(0, 1fr) 280px; gap: 56px; }
    .toc { position: sticky; top: calc(var(--header-h) + 22px); order: 2; }
    .toc summary { pointer-events: none; }
    .toc summary::after { display: none; }

    .footer-inner { grid-template-columns: 1fr 1.3fr; gap: 56px; }
}

/* =========================================================
   ≥ 1000px (navigation fits in header)
   ========================================================= */
@media (min-width: 1000px) {
    .main-nav { display: flex; }
    .mobile-nav { display: none; }
}

/* =========================================================
   Small phones
   ========================================================= */
@media (max-width: 420px) {
    body { font-size: 16px; }
    .logo img { width: 34px; height: 34px; }
    .logo-word { font-size: 17px; }
    .check-list { padding: 14px 16px; }
    .metric-list li { padding-left: 64px; }
    .metric-list li::before { left: 14px; }
    blockquote { padding: 44px 20px 22px; }
}

/* =========================================================
   Print & motion
   ========================================================= */
@media print {
    body { background: #fff; color: #000; }
    .site-header, .mobile-nav, .toc, .related-section, footer { display: none; }
    .summary-note { background: none; border: 1px solid #000; }
    .content-body .summary-note p { color: #000; }
}
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { transition-duration: .001ms !important; animation-duration: .001ms !important; }
}