/* ============================================================
   四木留痕 · 浅色纸感编辑部风格
   米白底 + 墨色字 + 衬线标题 + 等宽细节 + 细边框
   ============================================================ */
:root {
  --paper: #f6f4ee;
  --paper-2: #fffdf8;
  --ink: #1e1b16;
  --ink-2: #5d564c;
  --ink-3: #98907f;
  --line: #e0dbd0;
  --line-2: #cfc8b9;
  --accent: #c2410c;      /* 砖橙：小站的烟火气 */
  --accent-soft: #fdf0e7;
  --radius: 10px;
  --maxw: 1320px;         /* 正文宽度：两侧仍留大片纸白 */
  --serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, serif;
  --sans: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  --mono: "JetBrains Mono", "Cascadia Code", Consolas, "Courier New", monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.85;
  font-size: 15.5px;
  -webkit-font-smoothing: antialiased;
  display: flex; flex-direction: column; min-height: 100vh;
}
/* 纸张肌理 */
body::before {
  content: ""; position: fixed; inset: 0; pointer-events: none; z-index: 0; opacity: .5;
  background-image: radial-gradient(rgba(30, 27, 22, .028) 1px, transparent 1px);
  background-size: 26px 26px;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
::selection { background: rgba(194, 65, 12, .18); }
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-thumb { background: #d5cfc2; border-radius: 8px; border: 2px solid var(--paper); }
::-webkit-scrollbar-thumb:hover { background: #bfb8a7; }
.mono { font-family: var(--mono); }
h1, h2, h3, h4 { font-family: var(--serif); font-weight: 700; letter-spacing: .5px; }
.small { font-size: 13px; }
.dim { color: var(--ink-3); }
.loading { color: var(--ink-3); font-size: 14px; }

/* ---------------- 导航 ---------------- */
.site-nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(246, 244, 238, .92);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 32px;
  height: 60px; display: flex; align-items: center; justify-content: space-between; gap: 18px;
}
.logo { display: flex; align-items: center; gap: 10px; font-family: var(--serif); font-weight: 700; font-size: 16.5px; letter-spacing: .5px; }
.logo img { width: 26px; height: 26px; border-radius: 6px; }
.main-nav { display: flex; align-items: center; gap: 28px; }
.main-nav > a, .dd-btn {
  font-size: 14.5px; color: var(--ink-2); background: none; border: 0; cursor: pointer;
  font-family: inherit; padding: 4px 0; position: relative; transition: color .2s;
}
.main-nav > a:hover, .dd-btn:hover { color: var(--ink); }
.main-nav > a::after {
  content: ""; position: absolute; left: 0; right: 100%; bottom: -2px; height: 2px;
  background: var(--accent); transition: right .25s ease;
}
.main-nav > a:hover::after, .main-nav > a.active::after { right: 0; }
.main-nav > a.active { color: var(--ink); font-weight: 600; }
.dropdown { position: relative; }
.dd-btn { display: inline-flex; align-items: center; gap: 5px; }
.dd-btn.active { color: var(--ink); font-weight: 600; }
.dd-btn .chev { transition: transform .2s ease; }
.dropdown.open .dd-btn .chev { transform: rotate(180deg); }
.dd-menu {
  position: absolute; top: calc(100% + 10px); left: 50%; transform: translateX(-50%) translateY(6px);
  min-width: 250px; white-space: nowrap; background: var(--paper-2); border: 1px solid var(--line-2); border-radius: var(--radius);
  box-shadow: 0 14px 34px rgba(30, 27, 22, .12); padding: 6px;
  opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s;
}
.dropdown.open .dd-menu { opacity: 1; pointer-events: auto; transform: translateX(-50%) translateY(0); }
.dd-menu a {
  display: flex; align-items: center; gap: 11px; padding: 10px 14px; border-radius: 7px;
  font-size: 14px; font-weight: 600; color: var(--ink);
}
.dd-menu a:hover { background: var(--accent-soft); color: var(--accent); }
.dd-icon { width: 22px; height: 22px; border-radius: 6px; flex: none; }

/* ---------------- 布局 ---------------- */
.wrap { position: relative; z-index: 1; flex: 1 0 auto; max-width: var(--maxw); width: 100%; margin: 0 auto; padding: 0 32px 48px; }
.hero {
  padding: 68px 0 52px; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 56px; align-items: start;
}
.hero-main { min-width: 0; }
.hero-title { display: flex; align-items: center; gap: 22px; margin-bottom: 18px; }
.hero-icon {
  width: 66px; height: 66px; border-radius: 16px; flex: none;
  border: 1px solid var(--line); box-shadow: 0 12px 26px rgba(30, 27, 22, .14);
}
.kicker { font-size: 11.5px; letter-spacing: 4px; color: var(--accent); margin-bottom: 16px; }
.hero h1 { font-size: clamp(32px, 4.6vw, 50px); line-height: 1.2; margin-bottom: 16px; }
.hero-title h1 { margin-bottom: 0; }
.hero-lead { font-size: 16.5px; color: var(--ink-2); line-height: 2; }
/* 标语（功能介绍首段）：比正文大一号，左侧砖橙短竖线 */
.hero-slogan {
  font-family: var(--serif); font-size: 20px; font-weight: 600; line-height: 1.7; color: var(--ink);
  letter-spacing: .3px; padding-left: 16px; border-left: 3px solid var(--accent); margin-bottom: 18px;
}
.hero-slogan:empty { display: none; }
.kw { font-weight: 700; color: var(--accent); }
/* 关于页：一句主打文案，比作品页标语再大一号（同一套砖橙短竖线语言） */
.about-line {
  font-family: var(--serif); font-size: clamp(22px, 3vw, 32px); font-weight: 600; line-height: 1.75;
  color: var(--ink); letter-spacing: .5px; padding-left: 18px; border-left: 3px solid var(--accent);
}
.about-line + .about-line { margin-top: 14px; font-family: var(--sans); font-size: 16px; font-weight: 400; color: var(--ink-2); line-height: 2; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 30px; }

/* 下载信息：占右半，左缘一条竖分隔线 */
.hero-dl { border-left: 1px solid var(--line); padding-left: 44px; }
.hero-dl .label { font-size: 11px; letter-spacing: 3px; color: var(--ink-3); margin-bottom: 16px; }
.dl-grid { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 20px 24px; align-items: start; }
.dl-info { min-width: 0; }
.dl-info h3 { font-size: 17px; letter-spacing: .5px; }

.block { padding: 44px 0; border-top: 1px solid var(--line); }
.block-head { display: flex; align-items: baseline; gap: 16px; margin-bottom: 30px; }
.block-head .num { font-size: 12px; color: var(--ink-3); }
.block-head h2 { font-size: 25px; letter-spacing: 2px; }
.block-head .rule { flex: 1; height: 1px; background: var(--line); }

/* ---------------- 按钮 ---------------- */
.btn {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  padding: 12px 26px; border-radius: 999px; font-size: 14.5px; font-weight: 600;
  border: 1px solid transparent; cursor: pointer; transition: all .22s ease; white-space: nowrap;
}
.btn-ink { background: var(--ink); color: var(--paper); }
.btn-ink:hover { background: var(--accent); transform: translateY(-1px); box-shadow: 0 8px 20px rgba(194, 65, 12, .25); }
.btn-line { border-color: var(--line-2); color: var(--ink); background: transparent }
.btn-line:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.btn:active { transform: scale(.98); }

/* ---------------- Markdown 渲染区 ---------------- */
.doc-body { max-width: 780px; color: var(--ink); }
.doc-body h1 { font-size: 30px; margin: 30px 0 14px; }
.doc-body h2 { font-size: 22px; margin: 34px 0 12px; padding-bottom: 8px; border-bottom: 1px solid var(--line); }
.doc-body h3 { font-size: 17.5px; margin: 26px 0 10px; }
.doc-body h4 { font-size: 15.5px; margin: 20px 0 8px; }
.doc-body p { margin: 10px 0; color: var(--ink-2); }
.doc-body > p:first-child { font-size: 16.5px; color: var(--ink); }
.doc-body ul, .doc-body ol { margin: 8px 0 8px 4px; padding-left: 22px; color: var(--ink-2); }
.doc-body li { margin: 5px 0; }
.doc-body li::marker { color: var(--accent); font-family: var(--mono); font-size: .9em; }
.doc-body li > ul, .doc-body li > ol { margin: 4px 0 6px; }
.doc-body strong { color: var(--ink); }
.doc-body code {
  font-family: var(--mono); font-size: .86em; background: #ece8de;
  padding: 2px 7px; border-radius: 5px; color: #8a3c10;
}
.doc-body pre {
  background: #211d17; color: #e8e2d4; border-radius: var(--radius);
  padding: 18px 22px; margin: 14px 0; overflow-x: auto; line-height: 1.6;
}
.doc-body pre code { background: none; padding: 0; color: inherit; font-size: 13px; }
.doc-body blockquote {
  border-left: 3px solid var(--accent); background: var(--accent-soft);
  padding: 10px 18px; margin: 14px 0; border-radius: 0 8px 8px 0; color: var(--ink-2); font-size: 14.5px;
}
.doc-body blockquote p { margin: 2px 0; }
.doc-body table { border-collapse: collapse; margin: 16px 0; width: 100%; font-size: 13.8px; }
.doc-body th, .doc-body td { border: 1px solid var(--line-2); padding: 8px 13px; text-align: left; }
.doc-body th { background: #ece8de; font-family: var(--serif); letter-spacing: 1px; }
.doc-body tr:nth-child(even) td { background: rgba(255, 253, 248, .7); }
.doc-body hr { border: 0; border-top: 1px dashed var(--line-2); margin: 26px 0; }
.doc-body a { color: var(--accent); border-bottom: 1px solid rgba(194, 65, 12, .35); }
.doc-body a:hover { background: var(--accent-soft); }

/* ---------------- 功能卡片（一屏三个） ---------------- */
.features-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.fcard {
  position: relative; background: var(--paper-2); border: 1px solid var(--line);
  border-radius: 14px; padding: 22px 22px 18px;
  transition: transform .28s ease, border-color .28s, box-shadow .28s;
  animation: cardIn .5s ease both; animation-delay: var(--d, 0s);
}
@keyframes cardIn { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
.fcard:hover { transform: translateY(-4px); border-color: var(--accent); box-shadow: 0 18px 36px rgba(30, 27, 22, .09); }
.fnum {
  position: absolute; top: 22px; right: 22px; font-size: 11.5px; letter-spacing: 1px;
  color: var(--ink-3); font-family: var(--mono); transition: color .28s;
}
.fcard:hover .fnum { color: var(--accent); }
.fcard h3 { font-size: 16.5px; letter-spacing: 1.5px; margin-bottom: 10px; padding-right: 34px; }
.fcard h3::after {
  content: ""; display: block; width: 24px; height: 2px; margin-top: 7px;
  background: var(--accent); border-radius: 2px; opacity: .8;
}
.fcard ul { list-style: none; }
.fcard li { font-size: 13.1px; color: var(--ink-2); padding: 3px 0 3px 15px; position: relative; line-height: 1.7; }
.fcard li b, .fcard li strong { color: var(--ink); font-weight: 600; }
.fcard li::before {
  content: ""; position: absolute; left: 2px; top: 12.5px; width: 5px; height: 5px;
  border-radius: 50%; background: var(--accent); opacity: .5;
}
/* 合并卡内的分组名（手机传感器信息读取 / 文件互传 / 红外控制）：提成小标题，与说明分层 */
.fcard li.has-head { padding-left: 0; margin-top: 13px; }
.fcard li.has-head:first-child { margin-top: 0; }
.fcard li.has-head::before { display: none; }
.fcard .fg {
  display: block; font-family: var(--serif); font-size: 14.6px; font-weight: 700; letter-spacing: .6px;
  color: var(--ink); padding-left: 9px; border-left: 2px solid var(--accent); margin-bottom: 3px;
}
.fcard .fd { display: block; padding-left: 11px; }
.fcard code {
  font-family: var(--mono); font-size: .86em; background: #ece8de;
  padding: 1px 6px; border-radius: 4px; color: #8a3c10;
}

/* ---------------- 界面预览：无缝循环轮播（一屏 4 张，无圆角无图注）+ 滑动指示 ---------------- */
.film { overflow: hidden; position: relative; touch-action: pan-y; }
.film-track { display: flex; gap: 16px; width: max-content; will-change: transform; }
.film figure {
  flex: 0 0 var(--shot-w, 250px); border: 1px solid var(--line); overflow: hidden; background: var(--paper-2);
}
.film.dragging, .film.dragging img { cursor: grabbing; }
.film-nav {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 2;
  width: 34px; height: 34px; border-radius: 50%; display: grid; place-items: center;
  background: rgba(255, 255, 255, .92); border: 1px solid var(--line); color: var(--ink-2);
  cursor: pointer; box-shadow: 0 4px 14px rgba(30, 27, 22, .12);
  transition: background .2s, color .2s, border-color .2s;
}
.film-nav:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.film-nav:focus-visible, .film-dots button:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
#filmPrev { left: 12px; }
#filmNext { right: 12px; }
.film-nav[hidden], .film-bar[hidden] { display: none; }
.film img { aspect-ratio: 9 / 20; object-fit: contain; object-position: top; cursor: zoom-in; }

/* 指示：叠在图片栏内部底部居中的一枚胶囊（长条式页码，当前项变砖橙并加长） */
.film-bar {
  position: absolute; left: 50%; bottom: 14px; transform: translateX(-50%); z-index: 3;
  display: flex; align-items: center; padding: 8px 14px; border-radius: 999px;
  background: rgba(250, 248, 242, .86); border: 1px solid var(--line);
  box-shadow: 0 4px 14px rgba(30, 27, 22, .12); backdrop-filter: blur(4px);
}
.film-dots { display: flex; align-items: center; gap: 7px; }
.film-dots button {
  width: 20px; height: 4px; padding: 0; border: 0; border-radius: 2px;
  background: var(--line); cursor: pointer; transition: background .25s, width .25s;
}
.film-dots button:hover { background: var(--ink-3); }
.film-dots button.on { background: var(--accent); width: 32px; }

/* ---------------- 下载信息（Hero 右侧） ---------------- */
.dl-info h3 .mono { font-size: 13.5px; color: var(--accent); font-weight: 400; }
.dl-meta { list-style: none; margin: 12px 0 0; }
.dl-meta li {
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
  font-size: 13px; padding: 7px 0; border-bottom: 1px dashed var(--line);
}
.dl-meta span { color: var(--ink-3); flex: none; }
.dl-meta b { font-weight: 600; word-break: break-all; text-align: right; font-size: 12.6px; }
/* MD5 与其他行同样单行显示（值不折行，靠缩小摘要字号与收紧留白保证放得下） */
.dl-meta .li-md5 { gap: 14px; }
.dl-btn { flex: none; min-width: 190px; }
/* 下载按钮行：横跨整个下载区（含二维码下方空间），左为下载按钮，右为“其他方式”（小字、单行不包行） */
.dl-row { grid-column: 1 / -1; display: flex; align-items: center; gap: 6px 18px; }
.md5-val {
  font-family: var(--mono); font-size: 11.6px; font-weight: 600; color: var(--ink);
  background: none; border: 0; padding: 0; margin: 0; text-align: right;
  white-space: nowrap; cursor: copy; transition: color .2s;
}
.md5-val:hover { color: var(--accent); }
.md5-val:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }
.md5-val.copied { color: #15803d; }
.qr-box {
  background: #efebe1; border: 1px solid var(--line); border-radius: 14px; padding: 12px 12px 9px;
  text-align: center;
}
.qr-box img {
  width: 132px; height: 132px; border-radius: 8px; margin: 0 auto;
  background: #fff; padding: 5px; box-shadow: 0 6px 16px rgba(30, 27, 22, .1);
}
.qr-box p { margin-top: 7px; color: var(--ink-3); font-size: 12.2px; letter-spacing: .5px; }

/* 其他方式（config.app.alt_downloads）：下载按钮右侧，标题与内容分两行、靠右对齐，进一点弱化 */
.alt-dl { flex: 1 1 auto; min-width: 0; text-align: right; color: var(--ink-3); opacity: .68; }
.alt-dl-title {
  display: block; font-family: var(--mono); font-size: 10px; letter-spacing: 1px;
  color: var(--ink-3); margin-bottom: 1px;
}
.alt-dl-list { list-style: none; display: block; }
.alt-dl-list li {
  display: inline; font-size: 11.5px; color: var(--ink-3); line-height: 1.5;
}
.alt-dl-list li + li::before { content: " / "; color: var(--line-2); }
.alt-dl-list .alt-name { color: var(--ink-3); font-weight: 400; }
a.alt-dl-list .alt-name:hover { color: var(--accent); }
.alt-dl-list .alt-note { color: var(--ink-3); font-size: 11px; }

/* ---------------- 协议 ---------------- */
/* 协议用途说明：砖橙短竖线 + 淡底提示块（与标语、引用同一套语言） */
.proto-brief p {
  color: var(--ink-2); font-size: 15.8px; line-height: 2.05; max-width: 940px;
  border-left: 3px solid var(--accent); background: var(--accent-soft);
  padding: 18px 24px; border-radius: 0 12px 12px 0;
}
.proto-brief .kw { color: var(--accent); }
.proto-top { display: flex; justify-content: space-between; align-items: flex-end; gap: 20px; padding: 64px 0 28px; flex-wrap: wrap; }
.proto-top h1 { font-size: clamp(26px, 4vw, 38px); }
.proto-layout { display: grid; grid-template-columns: 220px 1fr; gap: 44px; align-items: start; border-top: 1px solid var(--line); padding-top: 30px; }
.proto-toc {
  position: sticky; top: 80px; max-height: calc(100vh - 100px); overflow-y: auto;
  font-size: 13px; border-right: 1px solid var(--line); padding-right: 18px;
}
.proto-toc a {
  display: block; padding: 5px 10px; color: var(--ink-2); border-left: 2px solid transparent;
  transition: all .18s; line-height: 1.5;
}
.proto-toc a:hover { color: var(--accent); border-left-color: var(--accent); background: var(--accent-soft); }
.proto-toc .toc-h3 { padding-left: 24px; font-size: 12px; color: var(--ink-3); }

/* ---------------- Blog / 关于 ---------------- */
.blog-list { list-style: none; border-top: 1px solid var(--line); }
.blog-list li { border-bottom: 1px solid var(--line); }
.blog-list a { display: flex; gap: 18px; align-items: baseline; padding: 18px 6px; transition: background .2s, padding .2s; }
.blog-list a:hover { background: var(--paper-2); padding-left: 14px; }
.blog-list time { font-size: 12px; color: var(--ink-3); flex: none; }
.blog-list strong { font-size: 16px; font-weight: 600; }
.blog-list p { font-size: 13px; color: var(--ink-2); margin-top: 2px; }
.blog-empty {
  border: 1px dashed var(--line-2); border-radius: 16px; padding: 54px 30px; text-align: center;
  color: var(--ink-3); font-size: 14.5px; background: var(--paper-2);
}
.blog-empty .big { font-family: var(--serif); font-size: 20px; color: var(--ink-2); display: block; margin-bottom: 8px; }

/* ---------------- 联系：左侧三行文本，右侧两张二维码 ---------------- */
.contact-wrap { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 60px; align-items: start; }
.contact-list { list-style: none; }
.contact-list li {
  display: flex; align-items: baseline; gap: 18px; padding: 10px 0;
  border-bottom: 1px dashed var(--line); min-width: 380px;
}
.contact-list .c-label { font-size: 11.5px; letter-spacing: 2.5px; color: var(--ink-3); width: 48px; flex: none; }
.contact-list .c-value { font-family: var(--mono); font-size: 15.5px; font-weight: 600; min-width: 0; overflow-wrap: anywhere; word-break: break-all; }
.contact-list a.c-value:hover { color: var(--accent); }
.contact-qrs { display: flex; gap: 22px; }
.qr-item { text-align: center; }
.qr-item img {
  width: 134px; height: 134px; object-fit: contain; background: #fff; padding: 8px;
  border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 10px 24px rgba(30, 27, 22, .1);
}
.qr-item figcaption { font-size: 12px; color: var(--ink-3); margin-top: 7px; letter-spacing: 1px; display: block; }

/* ---------------- 页脚（备案号恒居页底） ---------------- */
.site-foot { border-top: 1px solid var(--line); background: var(--paper-2); position: relative; z-index: 1; margin-top: auto; }
.foot-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 24px 32px;
  display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap;
  font-size: 12.8px; color: var(--ink-3);
}
.foot-beian a { color: var(--ink-3); }
.foot-beian a:hover { color: var(--accent); }

/* ---------------- Lightbox ---------------- */
.lightbox {
  position: fixed; inset: 0; z-index: 300; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 14px; padding: 6vw;
  background: rgba(30, 27, 22, .82); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  opacity: 0; pointer-events: none; transition: opacity .28s; cursor: zoom-out;
}
.lightbox.open { opacity: 1; pointer-events: auto; }
.lightbox img {
  max-width: min(440px, 90vw); max-height: 78vh; border-radius: 14px;
  border: 4px solid #fff; box-shadow: 0 24px 60px rgba(0, 0, 0, .4);
  transform: scale(.95); transition: transform .28s;
}
.lightbox.open img { transform: scale(1); }
.lb-cap { font-size: 13px; color: #e9e4da; }

/* ---------------- 入场 ---------------- */
.fade-in { animation: fadeIn .5s ease both; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1240px) {
  /* 窗口偏窄时再收紧一点，保证 MD5 单行不溢出 */
  .dl-grid { gap: 18px; }
  .hero-dl { padding-left: 36px; }
  .qr-box img { width: 118px; height: 118px; }
  .md5-val { font-size: 11px; }
}
@media (max-width: 1080px) {
  .hero { grid-template-columns: 1fr; gap: 36px; }
  .hero-dl { border-left: 0; padding-left: 0; border-top: 1px solid var(--line); padding-top: 30px; }
  .features-grid { grid-template-columns: 1fr 1fr; }
  .contact-wrap { grid-template-columns: 1fr; gap: 32px; }
  .proto-layout { grid-template-columns: 1fr; }
  .proto-toc { position: static; max-height: none; border-right: 0; border-bottom: 1px solid var(--line); padding: 0 0 14px; }
  .md5-val { font-size: 12.6px; }   /* 单栏后宽度宽裕，摘要字号回到常规 */
}
@media (max-width: 560px) {
  .dl-grid { grid-template-columns: 1fr; }
  .qr-box { width: max-content; }
}
@media (max-width: 620px) {
  .nav-inner, .wrap { padding-left: 20px; padding-right: 20px; }
  .main-nav { gap: 16px; }
  .main-nav > a, .dd-btn { font-size: 13.5px; }
  .hero { padding: 44px 0 34px; }
  .hero-icon { width: 54px; height: 54px; }
  .hero-title { gap: 16px; }
  .dl-btn { min-width: 0; width: 100%; }
  .dl-row { flex-wrap: wrap; }
  .alt-dl { flex: 1 1 100%; }
  .features-grid { grid-template-columns: 1fr; }
  .film-nav { width: 30px; height: 30px; }
  #filmPrev { left: 8px; }
  #filmNext { right: 8px; }
  .film-dots { gap: 6px; }
  .film-dots button { width: 16px; }
  .film-dots button.on { width: 26px; }
  .film-bar { bottom: 10px; padding: 7px 12px; }
  .contact-list li { min-width: 0; }
  .contact-qrs { gap: 14px; }
  .qr-item img { width: 118px; height: 118px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}