/* 读空气项目门户（https://home.dukongqi.cn/，D-097、D-098、D-099）：公益组织门户风格。
   所有项目页共用；动效由 portal.js 驱动，系统设置「减少动态效果」时全部停用。 */
:root {
  --navy: #0f2a3d; --navy-2: #173a52; --navy-3: #22506f;
  --teal: #12a37f; --teal-2: #0e8a6b; --teal-soft: #e5f7f1;
  --sky: #2e80d4; --sky-soft: #e8f1fb; --amber-soft: #fdf1e4;
  --ink: #17212b; --ink-2: #4c5b68; --ink-3: #7b8994;
  --bg: #fff; --bg-2: #f3f6f8; --line: #e1e7ec;
  --good: #2cc937; --moderate: #f4dd2f; --usg: #f18627; --unhealthy: #c8433e; --very: #8f3f97; --hazard: #871c35;
  --radius: 12px; --shadow: 0 18px 40px -18px rgba(15, 42, 61, .35);
  --ease: cubic-bezier(.2, .7, .2, 1);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body { margin: 0; color: var(--ink); background: var(--bg);
  font: 16px/1.7 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased; }
a { color: var(--sky); }
img { display: block; max-width: 100%; }
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

/* ---------- 顶栏 ---------- */
.util { background: var(--navy); color: #c7d4de; font-size: 13px; }
.util .wrap { display: flex; justify-content: flex-end; gap: 22px; height: 34px; align-items: center; }
.util a { color: #c7d4de; text-decoration: none; }
.util a:hover { color: #fff; }
.site-header { position: sticky; top: 0; z-index: 50; background: rgba(255, 255, 255, .92);
  backdrop-filter: saturate(160%) blur(14px); -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid transparent; transition: box-shadow .3s, border-color .3s; }
.site-header.scrolled { border-bottom-color: var(--line); box-shadow: 0 6px 20px -12px rgba(15, 42, 61, .3); }
.site-header .wrap { display: flex; align-items: center; height: 72px; gap: 32px; transition: height .3s var(--ease); }
.site-header.scrolled .wrap { height: 60px; }
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--navy); flex-shrink: 0; }
.logo .mark { width: 36px; height: 36px; border-radius: 10px; position: relative; flex-shrink: 0;
  background: conic-gradient(from 200deg, var(--good), var(--moderate), var(--usg), var(--unhealthy), var(--very), var(--good)); }
.logo .mark::after { content: ""; position: absolute; inset: 7px; border-radius: 50%; background: #fff; }
.logo:hover .mark { animation: spin 1.2s var(--ease); }
@keyframes spin { to { transform: rotate(360deg); } }
.logo b { font-size: 20px; letter-spacing: .08em; display: block; line-height: 1.2; }
.logo small { display: block; font-size: 11px; color: var(--ink-3); letter-spacing: .04em; }
.site-nav { display: flex; gap: 30px; flex: 1; font-size: 15px; font-weight: 500; }
.site-nav a { color: var(--ink); text-decoration: none; position: relative; padding: 6px 0; }
.site-nav a::after { content: ""; position: absolute; left: 0; right: 0; bottom: -2px; height: 3px; border-radius: 2px;
  background: var(--teal); transform: scaleX(0); transform-origin: left; transition: transform .3s var(--ease); }
.site-nav a:hover::after, .site-nav a[aria-current="page"]::after { transform: scaleX(1); }
.site-nav a[aria-current="page"] { color: var(--teal-2); }
.menu-btn { display: none; width: 42px; height: 42px; border: 0; background: transparent; border-radius: 8px; cursor: pointer; position: relative; }
.menu-btn span, .menu-btn span::before, .menu-btn span::after { position: absolute; left: 10px; width: 22px; height: 2px; border-radius: 2px;
  background: var(--navy); content: ""; transition: transform .3s var(--ease), opacity .2s; }
.menu-btn span { top: 20px; }
.menu-btn span::before { top: -7px; left: 0; }
.menu-btn span::after { top: 7px; left: 0; }
.menu-open .menu-btn span { background: transparent; }
.menu-open .menu-btn span::before { transform: translateY(7px) rotate(45deg); }
.menu-open .menu-btn span::after { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 按钮 ---------- */
.button { display: inline-flex; align-items: center; gap: 8px; background: var(--teal); color: #fff; text-decoration: none; font-weight: 600;
  font-size: 15px; padding: 11px 22px; border-radius: 8px; border: 0; cursor: pointer; position: relative; overflow: hidden;
  transition: background .2s, transform .2s var(--ease), box-shadow .2s; }
.button:hover { background: var(--teal-2); transform: translateY(-1px); box-shadow: 0 10px 20px -10px rgba(14, 138, 107, .7); }
.button:active { transform: translateY(0); }
.button .arrow { transition: transform .25s var(--ease); }
.button:hover .arrow { transform: translateX(4px); }
.button.ghost { background: transparent; color: #fff; box-shadow: inset 0 0 0 2px rgba(255, 255, 255, .8); }
.button.ghost:hover { background: rgba(255, 255, 255, .14); box-shadow: inset 0 0 0 2px #fff; }
.button.navy { background: var(--navy); }
.button.navy:hover { background: var(--navy-3); box-shadow: 0 10px 20px -10px rgba(15, 42, 61, .7); }
.button.light { background: #fff; color: var(--teal-2); }
.button.light:hover { background: #f2fbf8; }
.link-arrow { font-weight: 600; text-decoration: none; white-space: nowrap; }
.link-arrow::after { content: " →"; display: inline-block; transition: transform .25s var(--ease); }
.link-arrow:hover::after { transform: translateX(4px); }

/* ---------- 首屏 ---------- */
.hero { position: relative; color: #fff; overflow: hidden; isolation: isolate;
  background: linear-gradient(100deg, #183a57 0%, #2f6592 30%, #7d8f99 62%, #b98a5c 100%);
  background-size: 160% 160%; animation: sky-drift 24s ease-in-out infinite alternate; }
@keyframes sky-drift { from { background-position: 0% 40%; } to { background-position: 100% 60%; } }
.hero canvas.particles { position: absolute; inset: 0; width: 100%; height: 100%; z-index: 0; }
.hero .skyline { position: absolute; left: 0; right: 0; bottom: 0; aspect-ratio: 1920 / 230; z-index: 0;
  background: url(img/header.jpg) center bottom / 100% auto no-repeat; opacity: .85; }
.hero::before { content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(90deg, rgba(15, 42, 61, .88) 0%, rgba(15, 42, 61, .5) 52%, rgba(15, 42, 61, 0) 100%); }
.hero .wrap { position: relative; z-index: 2; padding: 104px 24px 132px; display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: center; }
.kicker { display: inline-flex; align-items: center; gap: 8px; text-transform: uppercase; letter-spacing: .14em; font-size: 13px;
  color: #9fe3cf; font-weight: 600; margin: 0 0 16px; }
.kicker .dot { width: 8px; height: 8px; border-radius: 50%; background: #3be2a8; box-shadow: 0 0 0 0 rgba(59, 226, 168, .7); animation: pulse 2s infinite; }
@keyframes pulse { 70% { box-shadow: 0 0 0 10px rgba(59, 226, 168, 0); } 100% { box-shadow: 0 0 0 0 rgba(59, 226, 168, 0); } }
.hero h1 { font-size: clamp(30px, 4.3vw, 50px); line-height: 1.15; margin: 0 0 20px; letter-spacing: -.01em; }
.hero h1 .line { display: block; overflow: hidden; white-space: nowrap; }
.hero h1 .line > span { display: inline-block; }
.hero .lede { font-size: 19px; max-width: 560px; color: #dbe6ee; margin: 0 0 32px; }
.hero .actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero .device { justify-self: center; position: relative; }
.hero .device img { width: 260px; border-radius: 34px; border: 8px solid #0d1318; box-shadow: 0 40px 80px -30px rgba(0, 0, 0, .65); }
.hero .device .badge { position: absolute; left: -40px; bottom: 70px; background: #fff; color: var(--ink); border-radius: 14px;
  padding: 12px 16px; box-shadow: var(--shadow); font-size: 13px; display: flex; gap: 10px; align-items: center; }
.hero .device .badge b { font-size: 22px; line-height: 1; }
.hero .device .badge i { width: 10px; height: 10px; border-radius: 50%; background: var(--good); }
.float { animation: float 7s ease-in-out infinite; }
.float.delay { animation-delay: -3.5s; }
@keyframes float { 50% { transform: translateY(-12px); } }
.page-hero { position: relative; color: #fff; overflow: hidden; background: linear-gradient(100deg, #183a57, #2f6592 60%, #4f7d9e);
  background-size: 160% 160%; animation: sky-drift 24s ease-in-out infinite alternate; }
.page-hero .wrap { position: relative; z-index: 2; padding: 64px 24px 72px; }
.page-hero h1 { font-size: clamp(30px, 4vw, 44px); margin: 0 0 10px; line-height: 1.2; }
.page-hero p { margin: 0; color: #dbe6ee; font-size: 18px; max-width: 640px; }
.crumbs { font-size: 13px; color: #b7c8d6; margin-bottom: 14px; }
.crumbs a { color: #d9e6ef; text-decoration: none; }

/* ---------- 数字栏 ---------- */
.impact { position: relative; z-index: 3; margin-top: -60px; }
.impact .grid { display: grid; grid-template-columns: repeat(4, 1fr); background: #fff; border-radius: var(--radius); box-shadow: var(--shadow); border: 1px solid var(--line); }
.impact .item { padding: 26px 28px; border-right: 1px solid var(--line); }
.impact .item:last-child { border-right: 0; }
.impact .n { font-size: 36px; font-weight: 700; color: var(--navy); line-height: 1.1; font-variant-numeric: tabular-nums; }
.impact .n small { font-size: 18px; font-weight: 600; margin-left: 2px; }
.impact .l { color: var(--ink-2); font-size: 14px; margin-top: 6px; }

/* ---------- 区块 ---------- */
section.block { padding: 88px 0; }
section.alt { background: var(--bg-2); }
.sec-head { display: flex; justify-content: space-between; align-items: end; gap: 24px; margin-bottom: 40px; flex-wrap: wrap; }
.sec-head .eyebrow { color: var(--teal-2); font-weight: 700; letter-spacing: .12em; font-size: 13px; text-transform: uppercase; margin: 0 0 8px; }
.sec-head h2 { font-size: clamp(26px, 3vw, 34px); line-height: 1.25; margin: 0; color: var(--navy); }
.sec-head p { margin: 10px 0 0; color: var(--ink-2); max-width: 640px; }

.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.pillar { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; transition: transform .35s var(--ease), box-shadow .35s; }
.pillar:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.pillar .ic { width: 48px; height: 48px; border-radius: 12px; display: grid; place-items: center; margin-bottom: 18px; }
.pillar .ic svg { width: 26px; height: 26px; }
.pillar h3 { margin: 0 0 8px; font-size: 20px; color: var(--navy); }
.pillar p { margin: 0; color: var(--ink-2); }

/* ---------- 此刻的空气（实时） ---------- */
.live { background: var(--navy); color: #e6eef4; position: relative; overflow: hidden; }
.live .sec-head h2 { color: #fff; }
.live .sec-head p { color: #b7c8d6; }
.live .sec-head .eyebrow { color: #7fe0c2; display: inline-flex; align-items: center; gap: 8px; }
.live-panel { background: var(--navy-2); border: 1px solid #24506e; border-radius: 16px; padding: 28px; }
.live-top { display: flex; justify-content: space-between; align-items: center; gap: 16px; flex-wrap: wrap; margin-bottom: 22px; }
.seg { display: inline-flex; background: #0c2232; border-radius: 999px; padding: 4px; }
.seg button { border: 0; background: transparent; color: #b7c8d6; font: inherit; font-size: 14px; font-weight: 600; padding: 6px 16px; border-radius: 999px; cursor: pointer; transition: background .25s, color .25s; }
.seg button[aria-pressed="true"] { background: #fff; color: var(--navy); }
.live-time { font-size: 13px; color: #9fb3c3; }
.dist { display: flex; height: 44px; border-radius: 10px; overflow: hidden; background: #0c2232; }
.dist i { display: block; height: 100%; width: 0; transition: width 1.1s var(--ease); position: relative; }
.dist i:hover { filter: brightness(1.12); }
.legend { display: grid; grid-template-columns: repeat(6, 1fr); gap: 10px; margin-top: 18px; }
.legend div { background: #0f2f45; border-radius: 10px; padding: 12px 14px; border-top: 3px solid; }
.legend b { display: block; font-size: 24px; color: #fff; font-variant-numeric: tabular-nums; line-height: 1.2; }
.legend span { font-size: 13px; color: #b7c8d6; }
.live-foot { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-top: 22px; font-size: 14px; color: #b7c8d6; }
.live-foot strong { color: #fff; }
.live-foot a { color: #7fe0c2; }
.live-empty { color: #b7c8d6; }

/* ---------- 功能 ---------- */
.feature { display: grid; grid-template-columns: 1.05fr .95fr; gap: 64px; align-items: center; }
.checks { padding: 0; margin: 22px 0 30px; list-style: none; }
.checks li { padding: 12px 0 12px 34px; position: relative; border-bottom: 1px solid var(--line); color: var(--ink-2); }
.checks li::before { content: ""; position: absolute; left: 0; top: 16px; width: 20px; height: 20px; border-radius: 50%; background: var(--teal-soft)
  url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5 10.5l3 3 7-7' fill='none' stroke='%230e8a6b' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/14px no-repeat; }
.checks li b { color: var(--ink); }
.shots { display: flex; gap: 22px; justify-content: center; }
.shots img { width: 46%; max-width: 240px; border-radius: 26px; border: 7px solid #10161c; box-shadow: 0 24px 50px -24px rgba(15, 42, 61, .55); }
.shots .lower { margin-top: 56px; }
.scale { display: flex; height: 6px; border-radius: 3px; overflow: hidden; margin-top: 8px; }
.scale i { flex: 1; transform: scaleY(1); }

/* ---------- 数据来源 ---------- */
.sources { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.source { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 26px 28px; position: relative; overflow: hidden; }
.source::before { content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--teal); transform: scaleY(0); transform-origin: top; transition: transform .7s var(--ease) .2s; }
.source.global::before { background: var(--sky); }
.source.in::before { transform: scaleY(1); }
.source h3 { margin: 0 0 6px; font-size: 19px; color: var(--navy); }
.source p { margin: 0; color: var(--ink-2); font-size: 15px; }
.source .meta { margin-top: 14px; font-size: 13px; color: var(--ink-3); }

/* ---------- 动态卡片 ---------- */
.news { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: #fff; display: flex; flex-direction: column;
  text-decoration: none; color: var(--ink); transition: transform .35s var(--ease), box-shadow .35s; }
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.card .img { height: 170px; overflow: hidden; }
.card .img > div { height: 100%; background-size: cover; background-position: center 18%; transition: transform .8s var(--ease); }
.card:hover .img > div { transform: scale(1.06); }
.card .body { padding: 20px 22px 24px; flex: 1; }
.tag { font-size: 12px; font-weight: 700; letter-spacing: .06em; color: var(--teal-2); background: var(--teal-soft); padding: 2px 8px; border-radius: 4px; }
.tag.sky { color: var(--sky); background: var(--sky-soft); }
.tag.amber { color: #b5641c; background: var(--amber-soft); }
.card time, .entry time { font-size: 13px; color: var(--ink-3); margin-left: 8px; }
.card h3 { font-size: 18px; margin: 10px 0 6px; line-height: 1.45; color: var(--navy); }
.card p { margin: 0; color: var(--ink-2); font-size: 15px; }

/* ---------- 问答 ---------- */
.faq-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 64px; }
.qa { border-bottom: 1px solid var(--line); }
.qa button { all: unset; box-sizing: border-box; width: 100%; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 16px;
  padding: 20px 0; font-weight: 600; font-size: 17px; color: var(--navy); }
.qa button:focus-visible { outline: 2px solid var(--sky); outline-offset: 4px; border-radius: 4px; }
.qa .pm { width: 28px; height: 28px; border-radius: 50%; background: var(--teal-soft); position: relative; flex-shrink: 0; transition: background .3s, transform .4s var(--ease); }
.qa .pm::before, .qa .pm::after { content: ""; position: absolute; left: 8px; right: 8px; top: 13px; height: 2px; border-radius: 1px; background: var(--teal-2); transition: transform .4s var(--ease); }
.qa .pm::after { transform: rotate(90deg); }
.qa.open .pm { background: var(--teal); transform: rotate(180deg); }
.qa.open .pm::before, .qa.open .pm::after { background: #fff; }
.qa.open .pm::after { transform: rotate(0); }
.qa .ans { height: 0; overflow: hidden; transition: height .4s var(--ease); }
.qa .ans > div { padding: 0 0 20px; color: var(--ink-2); }
.qa .ans p { margin: 0 0 8px; }
.faq-side { position: sticky; top: 100px; align-self: start; }
.toc { list-style: none; padding: 0; margin: 20px 0 0; }
.toc a { display: block; padding: 8px 14px; border-left: 3px solid var(--line); color: var(--ink-2); text-decoration: none; transition: border-color .25s, color .25s, background .25s; }
.toc a:hover, .toc a.active { border-left-color: var(--teal); color: var(--navy); background: var(--bg-2); }
.faq-group + .faq-group { margin-top: 48px; }
.faq-group h2 { font-size: 22px; color: var(--navy); margin: 0 0 4px; }

/* ---------- 动态时间线 ---------- */
.timeline { position: relative; padding-left: 36px; }
.timeline::before { content: ""; position: absolute; left: 11px; top: 6px; bottom: 6px; width: 2px; background: var(--line); }
.timeline .progress { position: absolute; left: 11px; top: 6px; width: 2px; height: 0; background: linear-gradient(var(--teal), var(--sky)); }
.entry { position: relative; padding: 0 0 36px; }
.entry::before { content: ""; position: absolute; left: -31px; top: 6px; width: 14px; height: 14px; border-radius: 50%; background: #fff; border: 3px solid var(--teal); }
.entry .head { display: flex; align-items: center; gap: 0; flex-wrap: wrap; }
.entry h3 { font-size: 20px; color: var(--navy); margin: 8px 0 6px; }
.entry p { margin: 0; color: var(--ink-2); }
.entry .pic { margin-top: 14px; border-radius: 12px; overflow: hidden; max-width: 560px; border: 1px solid var(--line); }
.entry .pic img { width: 100%; height: 220px; object-fit: cover; object-position: center 20%; }
.month { font-weight: 700; color: var(--ink-3); letter-spacing: .08em; font-size: 13px; margin: 0 0 18px -36px; padding-left: 36px; }

/* ---------- 支持 ---------- */
.support-band { background: linear-gradient(120deg, var(--teal-2), var(--sky)); background-size: 180% 180%; animation: sky-drift 14s ease-in-out infinite alternate;
  color: #fff; border-radius: 18px; padding: 52px 56px; display: flex; justify-content: space-between; align-items: center; gap: 32px; flex-wrap: wrap; position: relative; overflow: hidden; }
.support-band::after { content: ""; position: absolute; right: -60px; top: -60px; width: 240px; height: 240px; border-radius: 50%; background: rgba(255, 255, 255, .08); }
.support-band h2 { margin: 0 0 8px; font-size: 30px; }
.support-band p { margin: 0; max-width: 620px; color: #e6f6f1; }
.ways { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.way { background: #fff; border: 1px solid var(--line); border-radius: var(--radius); padding: 28px; }
.way h3 { margin: 12px 0 6px; color: var(--navy); font-size: 19px; }
.way p { margin: 0; color: var(--ink-2); font-size: 15px; }
.qr { width: 200px; height: 200px; border-radius: 14px; border: 2px dashed var(--line); display: grid; place-items: center; color: var(--ink-3); font-size: 14px; text-align: center; margin: 18px 0 0; background: var(--bg-2); }
.note { background: var(--bg-2); border-radius: var(--radius); padding: 20px 24px; color: var(--ink-2); font-size: 15px; }

/* ---------- 页尾 ---------- */
.site-footer { background: var(--navy); color: #a9bac7; font-size: 14px; padding: 60px 0 28px; }
.site-footer .cols { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 32px; }
.site-footer h4 { color: #fff; font-size: 15px; margin: 0 0 12px; }
.site-footer .cols a { color: #a9bac7; text-decoration: none; display: block; margin: 7px 0; transition: color .2s, transform .2s; }
.site-footer .cols a:hover { color: #fff; transform: translateX(3px); }
.site-footer .logo { color: #fff; }
.site-footer .logo .mark::after { background: var(--navy); }
.site-footer .about p { margin: 12px 0 0; max-width: 330px; }
.site-footer .bottom { border-top: 1px solid var(--navy-2); margin-top: 44px; padding-top: 20px; display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; font-size: 13px; }
.site-footer .bottom a { color: #a9bac7; }

/* ---------- 进场动画 ---------- */
.js [data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity .8s var(--ease), transform .8s var(--ease); transition-delay: var(--d, 0s); }
.js [data-reveal="left"] { transform: translateX(-30px); }
.js [data-reveal="right"] { transform: translateX(30px); }
.js [data-reveal="zoom"] { transform: scale(.94); }
.js [data-reveal].in { opacity: 1; transform: none; }
.js .hero h1 .line > span { transform: translateY(110%); transition: transform 1s var(--ease); transition-delay: var(--d, 0s); }
.js .hero.ready h1 .line > span { transform: none; }
.js .hero .lede, .js .hero .actions, .js .hero .kicker { opacity: 0; transform: translateY(16px); transition: opacity .9s var(--ease), transform .9s var(--ease); }
.js .hero.ready .kicker { opacity: 1; transform: none; transition-delay: .05s; }
.js .hero.ready .lede { opacity: 1; transform: none; transition-delay: .45s; }
.js .hero.ready .actions { opacity: 1; transform: none; transition-delay: .6s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .js [data-reveal], .js .hero h1 .line > span, .js .hero .lede, .js .hero .actions, .js .hero .kicker { opacity: 1 !important; transform: none !important; }
}

/* ---------- 窄屏 ---------- */
@media (max-width: 960px) {
  .util { display: none; }
  .site-nav { position: fixed; top: 62px; left: 0; right: 0; flex-direction: column; gap: 0; background: #fff; padding: 8px 24px 20px;
    border-bottom: 1px solid var(--line); box-shadow: var(--shadow); transform: translateY(-12px); opacity: 0; pointer-events: none;
    transition: transform .3s var(--ease), opacity .25s; }
  .site-nav a { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .site-nav a::after { display: none; }
  .menu-open .site-nav { transform: none; opacity: 1; pointer-events: auto; }
  .menu-btn { display: block; margin-left: auto; }
  .site-header .wrap, .site-header.scrolled .wrap { height: 62px; gap: 12px; }
  .site-header .cta { display: none; }
  .hero .wrap { grid-template-columns: 1fr; padding: 64px 24px 110px; }
  .hero .device { display: none; }
  .impact .grid { grid-template-columns: repeat(2, 1fr); }
  .impact .item:nth-child(2) { border-right: 0; }
  .impact .item:nth-child(-n+2) { border-bottom: 1px solid var(--line); }
  .impact .n { font-size: 30px; }
  .pillars, .news, .ways { grid-template-columns: 1fr; }
  .feature, .faq-grid, .sources { grid-template-columns: 1fr; gap: 36px; }
  .faq-side { position: static; }
  .legend { grid-template-columns: repeat(3, 1fr); }
  section.block { padding: 64px 0; }
  .support-band { padding: 34px 26px; }
  .site-footer .cols { grid-template-columns: 1fr 1fr; }
  .site-footer .about { grid-column: 1 / -1; }
}
@media (max-width: 480px) {
  .legend { grid-template-columns: repeat(2, 1fr); }
  .live-panel { padding: 20px; }
  .hero h1 { font-size: 32px; }
}