/* english.pipac.cn — minimal / modern / tech */
:root {
  --brand-1: #4f46e5;
  --brand-2: #06b6d4;
  --brand-3: #bd34fe;
  --bg: #ffffff;
  --bg-soft: #f7f8fb;
  --bg-elev: #ffffff;
  --fg: #16181d;
  --fg-2: #4a5060;
  --fg-3: #8a90a0;
  --line: #e6e8ee;
  --line-2: #eff1f6;
  --code-bg: #f2f3f7;
  --code-fg: #b3238a;
  --shadow: 0 1px 2px rgba(16, 24, 40, .04), 0 8px 24px -12px rgba(16, 24, 40, .12);
  --radius: 12px;
  --reader-font: 17px;
  --reader-lh: 1.85;
  --sans: "SF Pro SC", "SF Pro Text", "PingFang SC", "HarmonyOS Sans SC",
    -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", Roboto, sans-serif;
  --mono: "CharisSIL", "DejaVu Sans Mono", "SFMono-Regular", Consolas, monospace;
}
html[data-theme="sepia"] {
  --bg: #fbf7ef; --bg-soft: #f6f0e4; --bg-elev: #fffdf8;
  --fg: #2f2a22; --fg-2: #574e40; --fg-3: #8b8271;
  --line: #e6dcc8; --line-2: #efe7d7;
  --code-bg: #efe6d3; --code-fg: #9c3a2a;
}
html[data-theme="dark"] {
  --bg: #0e1015; --bg-soft: #14171e; --bg-elev: #171b23;
  --fg: #e8eaf0; --fg-2: #a8afbf; --fg-3: #7a8296;
  --line: #262c38; --line-2: #1e232d;
  --code-bg: #1c212b; --code-fg: #ff8ad0;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 12px 32px -16px rgba(0, 0, 0, .7);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 84px; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font-family: var(--sans); font-size: 16px; line-height: 1.7;
  -webkit-font-smoothing: antialiased; overflow-wrap: break-word;
}
a { color: var(--brand-1); text-decoration: none; }
a:hover { text-decoration: underline; }
img, video { max-width: 100%; height: auto; border-radius: 10px; display: block; margin: 1.2em auto; }
.skip { position: absolute; left: -999px; }
.skip:focus { left: 8px; top: 8px; z-index: 99; background: var(--bg-elev); padding: 8px 14px; border-radius: 8px; }

/* ---------- topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 40; display: flex; align-items: center; gap: 14px;
  height: 60px; padding: 0 18px; background: color-mix(in srgb, var(--bg) 84%, transparent);
  backdrop-filter: saturate(180%) blur(14px); border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 9px; font-weight: 650; color: var(--fg); }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid; place-items: center; width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--brand-1), var(--brand-2));
  color: #fff; font-size: 12px; font-weight: 800; letter-spacing: .5px;
}
.brand-text { font-size: 15px; letter-spacing: -.2px; white-space: nowrap; }
.topnav { display: flex; align-items: center; gap: 2px; margin-left: 10px; }
.topnav a {
  padding: 6px 11px; border-radius: 8px; color: var(--fg-2); font-size: 14px;
  display: inline-flex; align-items: center; gap: 6px;
}
.topnav a:hover { background: var(--bg-soft); color: var(--fg); text-decoration: none; }
.topnav a[data-nav].on { background: var(--bg-soft); color: var(--brand-1); font-weight: 600; }
.badge {
  min-width: 18px; height: 18px; padding: 0 5px; border-radius: 9px; background: var(--brand-1);
  color: #fff; font-size: 11px; line-height: 18px; text-align: center; font-weight: 700;
}
.topbar-right { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.seg { display: flex; border: 1px solid var(--line); border-radius: 9px; overflow: hidden; }
.seg button {
  border: 0; background: transparent; color: var(--fg-2); padding: 5px 10px; cursor: pointer; font-size: 13px;
}
.seg button:hover { background: var(--bg-soft); }
html[data-theme="light"] .seg button[data-theme-set="light"],
html[data-theme="sepia"] .seg button[data-theme-set="sepia"],
html[data-theme="dark"] .seg button[data-theme-set="dark"] { background: var(--brand-1); color: #fff; }
.icon-btn {
  border: 1px solid var(--line); background: var(--bg-elev); color: var(--fg-2);
  width: 30px; height: 30px; border-radius: 8px; cursor: pointer; font-size: 15px; line-height: 1;
}
.only-mobile { display: none; }

/* ---------- layout ---------- */
.layout { display: grid; grid-template-columns: 288px minmax(0, 1fr); gap: 0; max-width: 1500px; margin: 0 auto; }
.layout.has-toc { grid-template-columns: 288px minmax(0, 1fr) 232px; }
.sidebar {
  position: sticky; top: 60px; align-self: start; height: calc(100vh - 60px); overflow-y: auto;
  padding: 16px 10px 60px 18px; border-right: 1px solid var(--line-2); font-size: 14px;
}
.side-head { display: flex; align-items: center; justify-content: space-between; padding: 0 8px 8px; }
.side-title { font-size: 11px; letter-spacing: 1.4px; text-transform: uppercase; color: var(--fg-3); font-weight: 700; }
.side-head .icon-btn { display: none; }
.sidebar a, .sidebar .nav-label { display: block; padding: 5px 9px; border-radius: 7px; color: var(--fg-2); }
.sidebar a:hover { background: var(--bg-soft); color: var(--fg); text-decoration: none; }
.sidebar a.active { background: color-mix(in srgb, var(--brand-1) 12%, transparent); color: var(--brand-1); font-weight: 650; }
.sidebar [data-d="1"] { padding-left: 18px; }
.sidebar [data-d="2"] { padding-left: 30px; }
.sidebar [data-d="3"] { padding-left: 42px; }
.nav-group > summary { list-style: none; cursor: pointer; display: flex; align-items: center; gap: 6px; }
.nav-group > summary::-webkit-details-marker { display: none; }
.nav-group > summary::before { content: "▸"; color: var(--fg-3); font-size: 10px; transition: transform .15s; }
.nav-group[open] > summary::before { transform: rotate(90deg); }
.nav-group > summary a { flex: 1; padding: 5px 0; font-weight: 600; color: var(--fg); }
.nav-group > summary span { flex: 1; padding: 5px 0; font-weight: 600; color: var(--fg); }
.nav-group > summary a:hover { text-decoration: underline; background: none; }
.nav-group > summary.active a, .nav-group > summary.active span { color: var(--brand-1); }
.nav-kids { margin-left: 8px; }

.content { min-width: 0; padding: 26px 40px 80px; }
.content > p, .content > ul, .content > ol, .content > blockquote, .content > table { max-width: 780px; }
body[data-kind="home"] .content, body[data-kind="list"] .content,
body[data-kind="tools"] .content, body[data-kind="search"] .content { padding: 0 0 80px; }

/* ---------- typography ---------- */
.doc-h1, .content h1 {
  font-size: 30px; line-height: 1.3; letter-spacing: -.6px; margin: .2em 0 .8em; font-weight: 700;
}
.content h2 {
  font-size: 22px; margin: 2.1em 0 .7em; padding-top: .35em; letter-spacing: -.3px;
  border-top: 1px solid var(--line-2); font-weight: 650;
}
.content h3 { font-size: 18px; margin: 1.7em 0 .5em; font-weight: 650; }
.content h4 { font-size: 16px; margin: 1.4em 0 .4em; }
.content h2:first-child, .content h3:first-child { margin-top: 0; border-top: 0; }
.content p { margin: 1em 0; font-size: var(--reader-font); line-height: var(--reader-lh); }
.content li { font-size: var(--reader-font); line-height: 1.75; margin: .35em 0; }
.content ul, .content ol { padding-left: 1.5em; max-width: 780px; }
.content blockquote {
  margin: 1.3em 0; padding: .7em 1.1em; border-left: 3px solid var(--brand-2);
  background: var(--bg-soft); border-radius: 0 10px 10px 0; color: var(--fg-2);
}
.content blockquote p { font-size: calc(var(--reader-font) - 1px); margin: .45em 0; }
.content hr { border: 0; border-top: 1px solid var(--line); margin: 2.4em 0; }
.content strong, .content b { color: var(--fg); font-weight: 700; }
html[data-theme="light"] .content strong, html[data-theme="light"] .content b { color: rgb(63 86 99); }
html[data-theme="dark"] .content strong, html[data-theme="dark"] .content b { color: rgb(138 183 209); }
.content em, .content i { color: rgb(91 4 17); font-style: italic; }
html[data-theme="dark"] .content em, html[data-theme="dark"] .content i { color: rgb(187 121 131); }
.content code {
  font-family: var(--mono); font-size: .88em; background: var(--code-bg); color: var(--code-fg);
  padding: .12em .38em; border-radius: 5px;
}
.content pre {
  background: var(--code-bg); padding: 14px 16px; border-radius: 10px; overflow-x: auto;
  border: 1px solid var(--line); max-width: 900px;
}
.content pre code { background: none; color: var(--fg); padding: 0; font-size: 13px; }
.content table {
  border-collapse: collapse; width: auto; max-width: 100%; margin: 1.4em 0; font-size: 15px;
  display: block; overflow-x: auto; white-space: normal;
}
.content th, .content td { border: 1px solid var(--line); padding: 7px 11px; text-align: left; vertical-align: middle; }
.content th { background: var(--bg-soft); font-weight: 650; }
.content .math { font-family: var(--mono); background: var(--code-bg); padding: .1em .35em; border-radius: 5px; }
.content kbd {
  font-family: var(--mono); font-size: .82em; border: 1px solid var(--line);
  border-bottom-width: 2px; border-radius: 5px; padding: .1em .4em; background: var(--bg-soft);
}
.content details { border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; margin: 1.1em 0; background: var(--bg-soft); }
.content summary { cursor: pointer; font-weight: 600; }
.content .custom-block {
  margin: 1.4em 0; padding: 12px 16px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--bg-soft); border-left: 3px solid var(--brand-2); max-width: 820px;
}
.content .custom-block > p:first-child { margin-top: 0; }
.content .custom-block > p:last-child { margin-bottom: 0; }
.content .custom-block.tip { border-left-color: #10b981; background: color-mix(in srgb, #10b981 8%, var(--bg)); }
.content .custom-block.info { border-left-color: var(--brand-2); background: color-mix(in srgb, var(--brand-2) 8%, var(--bg)); }
.content .custom-block.warning { border-left-color: #f59e0b; background: color-mix(in srgb, #f59e0b 10%, var(--bg)); }
.content .custom-block.danger { border-left-color: #e5484d; background: color-mix(in srgb, #e5484d 9%, var(--bg)); }

/* phonetics + inline audio (upstream classes) */
.content span.pho {
  border-radius: 5px; padding: 1px 5px; background: var(--code-bg); color: var(--code-fg);
  font-family: var(--mono); font-size: .9em;
}
.content span.pho.alt::before, .content span.pho.alt::after {
  content: "/"; display: inline-block; width: .45em; color: var(--fg-3);
}
span.not-display { display: none; }
.two-column ol, .two-column ul { column-count: 2; column-gap: 2em; }
@media (max-width: 720px) { .two-column ol, .two-column ul { column-count: 1; } }

.speak-word { display: inline-flex; align-items: center; gap: 3px; vertical-align: baseline; margin: 0 2px; }
.speak-word .ctrl { display: inline-flex; gap: 2px; flex-wrap: wrap; }
.play-button {
  border: 1px solid var(--line); background: var(--bg-elev); border-radius: 6px; cursor: pointer;
  padding: 0 4px; height: 19px; display: inline-flex; align-items: center; gap: 2px;
  font-size: 9px; line-height: 1; color: var(--fg-3); vertical-align: middle;
}
.play-button:hover { border-color: var(--brand-1); color: var(--brand-1); }
.play-button .emoji { font-size: 10px; }
.play-button .icon { width: 8px; height: 8px; opacity: .75; }
.play-button.playing { background: var(--brand-1); border-color: var(--brand-1); color: #fff; }
.play-button audio { display: none; }
.pho-play {
  border: 1px solid var(--line); background: var(--bg-elev); border-radius: 6px; cursor: pointer;
  height: 19px; padding: 0 6px; margin-left: 4px; font-size: 10px; color: var(--fg-3); vertical-align: middle;
}
.pho-play:hover { border-color: var(--brand-1); color: var(--brand-1); }
.play-button.playing .icon, .play-button.playing .emoji { filter: brightness(0) invert(1); }

/* ---------- progress / toolbar / pager ---------- */
.progress { position: fixed; top: 60px; left: 0; right: 0; height: 2px; z-index: 39; background: transparent; }
.progress span { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--brand-1), var(--brand-2)); transition: width .1s linear; }
.reader-toolbar {
  position: fixed; right: 18px; bottom: 22px; z-index: 45; display: flex; gap: 4px;
  background: var(--bg-elev); border: 1px solid var(--line); border-radius: 12px;
  padding: 6px; box-shadow: var(--shadow);
}
.reader-toolbar button {
  border: 0; background: transparent; color: var(--fg-2); border-radius: 8px;
  padding: 6px 10px; cursor: pointer; font-size: 13px; font-family: var(--sans);
}
.reader-toolbar button:hover { background: var(--bg-soft); color: var(--brand-1); }
.pager {
  display: flex; gap: 12px; justify-content: space-between; max-width: 780px;
  margin: 3em 0 1em; padding-top: 1.6em; border-top: 1px solid var(--line);
}
.pager a {
  flex: 1; padding: 12px 16px; border: 1px solid var(--line); border-radius: 10px;
  background: var(--bg-elev); color: var(--fg-2); font-size: 14px; box-shadow: var(--shadow);
}
.pager a:hover { border-color: var(--brand-1); color: var(--brand-1); text-decoration: none; }
.pager .pager-next { text-align: right; }
.pager .disabled { opacity: .4; pointer-events: none; }
.page-head { padding: 22px 0 0; }
.crumb { display: flex; gap: 8px; align-items: center; font-size: 13px; color: var(--fg-3); flex-wrap: wrap; }
.crumb a { color: var(--fg-3); }
.crumb a:hover { color: var(--brand-1); }

.toc { position: sticky; top: 60px; align-self: start; height: calc(100vh - 60px); overflow-y: auto; padding: 24px 18px 60px; font-size: 13px; }
.toc-head { font-size: 11px; letter-spacing: 1.4px; text-transform: uppercase; color: var(--fg-3); font-weight: 700; margin-bottom: 9px; }
.toc-nav ul { list-style: none; margin: 0; padding: 0; }
.toc-nav li { margin: 1px 0; }
.toc-nav ul ul { padding-left: 11px; }
.toc-nav a { display: block; padding: 3px 8px; border-left: 2px solid transparent; color: var(--fg-3); border-radius: 0 6px 6px 0; }
.toc-nav a:hover { color: var(--fg); background: var(--bg-soft); text-decoration: none; }
.toc-nav a.on { color: var(--brand-1); border-left-color: var(--brand-1); background: color-mix(in srgb, var(--brand-1) 8%, transparent); font-weight: 600; }

/* ---------- home ---------- */
.hero {
  position: relative; overflow: hidden; padding: 74px 24px 60px; text-align: center;
  background: radial-gradient(1100px 460px at 50% -12%, color-mix(in srgb, var(--brand-1) 13%, transparent), transparent 70%);
}
.hero-inner { max-width: 860px; margin: 0 auto; }
.hero-eyebrow { font-size: 12px; letter-spacing: 2px; text-transform: uppercase; color: var(--fg-3); font-weight: 650; }
.hero h1 { font-size: 46px; line-height: 1.15; letter-spacing: -1.6px; margin: 14px 0 0; font-weight: 750; }
.grad { background: linear-gradient(120deg, var(--brand-3), var(--brand-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { font-size: 17px; color: var(--fg-2); margin: 16px auto 0; max-width: 620px; line-height: 1.8; }
.hero-cta { display: flex; gap: 12px; justify-content: center; margin-top: 26px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px; border-radius: 10px;
  border: 1px solid var(--line); background: var(--bg-elev); color: var(--fg-2); cursor: pointer;
  font-size: 14px; font-family: var(--sans); box-shadow: var(--shadow);
}
.btn:hover { border-color: var(--brand-1); color: var(--brand-1); text-decoration: none; }
.btn.primary { background: linear-gradient(135deg, var(--brand-1), var(--brand-2)); border-color: transparent; color: #fff; font-weight: 600; }
.btn.primary:hover { color: #fff; filter: brightness(1.06); }
.btn.danger:hover { border-color: #e5484d; color: #e5484d; }
.hero-stats { display: flex; gap: 34px; justify-content: center; margin-top: 40px; flex-wrap: wrap; }
.hero-stats div { display: flex; flex-direction: column; }
.hero-stats strong { font-size: 24px; letter-spacing: -.6px; }
.hero-stats span { font-size: 12px; color: var(--fg-3); }
.wrap { max-width: 1080px; margin: 0 auto; padding: 34px 24px; }
.sec-h { font-size: 20px; letter-spacing: -.4px; margin: 0 0 18px; display: flex; align-items: baseline; gap: 10px; }
.sec-h small { font-size: 13px; color: var(--fg-3); font-weight: 400; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(266px, 1fr)); gap: 12px; }
.card {
  display: flex; flex-direction: column; gap: 6px; padding: 16px 17px; border: 1px solid var(--line);
  border-radius: var(--radius); background: var(--bg-elev); box-shadow: var(--shadow);
}
.card:hover { border-color: var(--brand-1); text-decoration: none; transform: translateY(-1px); }
.card-t { font-weight: 650; color: var(--fg); font-size: 15px; }
.card-d { color: var(--fg-3); font-size: 12.5px; line-height: 1.6; }
.more { margin-top: 18px; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(238px, 1fr)); gap: 12px; }
.tool {
  display: flex; flex-direction: column; gap: 5px; padding: 18px; border-radius: var(--radius);
  border: 1px solid var(--line); background: linear-gradient(160deg, var(--bg-elev), var(--bg-soft));
  box-shadow: var(--shadow);
}
.tool:hover { border-color: var(--brand-1); text-decoration: none; transform: translateY(-1px); }
.tool-ico { font-size: 20px; }
.tool b { color: var(--fg); font-size: 15px; }
.tool em { color: var(--fg-3); font-size: 12.5px; font-style: normal; line-height: 1.6; }
.lib-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; }
.lib-list li a {
  display: flex; gap: 14px; align-items: baseline; padding: 12px 16px; border: 1px solid var(--line);
  border-radius: 10px; background: var(--bg-elev);
}
.lib-list li a:hover { border-color: var(--brand-1); text-decoration: none; }
.lib-t { font-weight: 600; color: var(--fg); white-space: nowrap; min-width: 168px; }
.lib-x { color: var(--fg-3); font-size: 13px; }
.lead { color: var(--fg-2); max-width: 720px; }

/* ---------- search ---------- */
.search-box { max-width: 820px; padding: 0 24px; }
#searchInput {
  width: 100%; padding: 13px 16px; font-size: 16px; font-family: var(--sans); border-radius: 11px;
  border: 1px solid var(--line); background: var(--bg-elev); color: var(--fg); outline: none;
}
#searchInput:focus { border-color: var(--brand-1); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand-1) 16%, transparent); }
.search-hint { font-size: 12.5px; color: var(--fg-3); margin: 10px 0 20px; }
.search-results { max-width: 820px; padding: 0 24px 40px; }
.sr { padding: 14px 16px; border: 1px solid var(--line); border-radius: 10px; margin-bottom: 10px; background: var(--bg-elev); }
.sr-t { font-weight: 650; }
.sr-b { font-size: 12px; color: var(--fg-3); }
.sr-p { color: var(--fg-2); font-size: 13.5px; margin-top: 6px; line-height: 1.7; }
.sr mark { background: color-mix(in srgb, var(--brand-2) 32%, transparent); color: inherit; border-radius: 3px; }

/* ---------- tools ---------- */
.pho-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(214px, 1fr)); gap: 10px; padding: 0 24px; max-width: 1080px; }
.pho-card { display: flex; flex-direction: column; gap: 4px; padding: 14px 15px; border: 1px solid var(--line); border-radius: 10px; background: var(--bg-elev); }
.pho-card:hover { border-color: var(--brand-1); text-decoration: none; }
.pho-card b { color: var(--fg); font-size: 15px; }
.pho-card span { color: var(--fg-3); font-size: 12px; line-height: 1.55; }
.vocab-actions { display: flex; gap: 8px; flex-wrap: wrap; padding: 0 24px 20px; max-width: 1080px; }
.vocab-list { padding: 0 24px; max-width: 1080px; display: grid; gap: 9px; }
.vocab-row {
  display: flex; align-items: center; gap: 14px; padding: 12px 15px; border: 1px solid var(--line);
  border-radius: 10px; background: var(--bg-elev);
}
.vocab-w { font-weight: 650; font-size: 16px; min-width: 150px; }
.vocab-ctx { color: var(--fg-3); font-size: 12.5px; flex: 1; }
.vocab-row button { border: 1px solid var(--line); background: transparent; border-radius: 7px; cursor: pointer; padding: 4px 9px; color: var(--fg-2); font-size: 12px; }
.vocab-row button:hover { border-color: var(--brand-1); color: var(--brand-1); }
.empty { color: var(--fg-3); padding: 26px 24px; border: 1px dashed var(--line); border-radius: 12px; text-align: center; }
.shadow-controls { display: flex; gap: 18px; flex-wrap: wrap; align-items: center; padding: 0 24px 18px; }
.shadow-controls label { font-size: 13px; color: var(--fg-2); display: flex; align-items: center; gap: 7px; }
.shadow-controls select, .shadow-controls input[type=range] { font-family: var(--sans); font-size: 13px; }
.shadow-controls select { padding: 6px 9px; border-radius: 8px; border: 1px solid var(--line); background: var(--bg-elev); color: var(--fg); max-width: 260px; }
.shadow-stage { padding: 0 24px 60px; max-width: 880px; }
.sh-line {
  border: 1px solid var(--line); border-radius: 11px; padding: 14px 16px; margin-bottom: 10px;
  background: var(--bg-elev); display: flex; gap: 12px; align-items: flex-start;
}
.sh-num { font-size: 11px; color: var(--fg-3); min-width: 20px; padding-top: 4px; font-variant-numeric: tabular-nums; }
.sh-txt { flex: 1; font-size: 16px; line-height: 1.75; }
.sh-txt .hl { background: color-mix(in srgb, var(--brand-2) 26%, transparent); border-radius: 3px; }
.sh-btns { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.sh-btns button { border: 1px solid var(--line); background: transparent; border-radius: 8px; padding: 5px 10px; cursor: pointer; font-size: 12.5px; color: var(--fg-2); font-family: var(--sans); }
.sh-btns button:hover { border-color: var(--brand-1); color: var(--brand-1); }
.sh-btns button.rec { background: #e5484d; border-color: #e5484d; color: #fff; }
.sh-score { font-size: 12.5px; margin-top: 7px; color: var(--fg-3); }
.sh-score b { font-size: 15px; }
.sh-rec { color: #e5484d; font-weight: 600; }

/* ---------- selection popup ---------- */
.sel-pop {
  position: absolute; z-index: 60; background: var(--bg-elev); border: 1px solid var(--line);
  border-radius: 11px; padding: 10px; box-shadow: var(--shadow); max-width: 300px;
}
.sel-word { font-weight: 650; font-size: 15px; margin-bottom: 8px; word-break: break-word; }
.sel-actions { display: flex; gap: 5px; flex-wrap: wrap; }
.sel-actions button { border: 1px solid var(--line); background: transparent; border-radius: 7px; padding: 4px 9px; cursor: pointer; font-size: 12px; color: var(--fg-2); font-family: var(--sans); }
.sel-actions button:hover { border-color: var(--brand-1); color: var(--brand-1); }
::selection { background: color-mix(in srgb, var(--brand-2) 34%, transparent); }

/* ---------- footer / responsive ---------- */
.site-foot { border-top: 1px solid var(--line); padding: 26px 24px; text-align: center; color: var(--fg-3); font-size: 12.5px; }
.site-foot p { margin: 0; max-width: 720px; margin: 0 auto; line-height: 1.8; }
.toast {
  position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%) translateY(8px);
  background: var(--fg); color: var(--bg); padding: 9px 16px; border-radius: 10px; font-size: 13px;
  opacity: 0; pointer-events: none; transition: opacity .18s, transform .18s; z-index: 80;
}
.toast.on { opacity: .95; transform: translateX(-50%) translateY(0); }

@media (max-width: 1180px) { .layout.has-toc { grid-template-columns: 268px minmax(0, 1fr); } .toc { display: none; } }
@media (max-width: 900px) {
  .only-mobile { display: grid; place-items: center; }
  .brand-text { display: none; }
  .topnav { overflow-x: auto; margin-left: 0; flex: 1; }
  .topnav a { white-space: nowrap; }
  .layout, .layout.has-toc { grid-template-columns: minmax(0, 1fr); }
  .sidebar {
    position: fixed; inset: 60px auto 0 0; width: 300px; z-index: 50; background: var(--bg);
    transform: translateX(-104%); transition: transform .22s ease; box-shadow: var(--shadow);
  }
  .sidebar.open { transform: none; }
  .side-head .icon-btn { display: grid; place-items: center; }
  .content { padding: 20px 18px 90px; }
  .hero { padding: 48px 18px 40px; }
  .hero h1 { font-size: 32px; }
  .lib-list li a { flex-direction: column; gap: 3px; }
  .lib-t { min-width: 0; }
  .reader-toolbar { right: 10px; bottom: 12px; }
  .hero-stats { gap: 20px; }
}
@media print { .topbar, .sidebar, .toc, .reader-toolbar, .pager, .site-foot { display: none; } }