/* PandaReader website — shared stylesheet
   Dark-first, bamboo-green accent. No external fonts or frameworks: the site must work on a LAN
   with nothing but IIS serving static files. */

:root {
  --bg: #0e1113;
  --bg-2: #141a1d;
  --card: #1a2226;
  --card-2: #1f2a2f;
  --line: #27333a;
  --text: #e6ecef;
  --text-2: #a7b4bb;
  --muted: #7d8b93;
  --accent: #4fd38a;
  --accent-2: #2fb86d;
  --accent-ink: #062a17;
  --warn: #f5c451;
  --danger: #f27272;
  --shadow: 0 10px 30px rgba(0, 0, 0, .45);
  --radius: 14px;
  --radius-sm: 9px;
  --max: 1180px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --mono: ui-monospace, "Cascadia Code", "Cascadia Mono", Consolas, "JetBrains Mono", Menlo, monospace;
  color-scheme: dark;
}
:root[data-theme="light"] {
  --bg: #f4f7f5;
  --bg-2: #eaefec;
  --card: #ffffff;
  --card-2: #f1f5f2;
  --line: #d9e1dc;
  --text: #141a1d;
  --text-2: #3f4b51;
  --muted: #6b787f;
  --accent: #1f9d5a;
  --accent-2: #167a45;
  --accent-ink: #ffffff;
  --shadow: 0 10px 30px rgba(20, 40, 30, .10);
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3, h4 { line-height: 1.2; margin: 0 0 .5em; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 4.5vw, 3.4rem); font-weight: 800; }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); font-weight: 750; }
h3 { font-size: 1.2rem; font-weight: 700; }
p { margin: 0 0 1em; }
code, kbd, pre { font-family: var(--mono); font-size: .92em; }
code { background: var(--card-2); border: 1px solid var(--line); padding: .1em .4em; border-radius: 6px; }
pre {
  position: relative;
  background: #0b0f11;
  color: #dfe7eb;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1rem 4.5rem 1rem 1.1rem;
  overflow: auto;
  line-height: 1.5;
}
:root[data-theme="light"] pre { background: #1a2226; }
pre code { background: none; border: 0; padding: 0; font-size: .9rem; }
hr { border: 0; border-top: 1px solid var(--line); margin: 2rem 0; }
.container { width: min(100% - 32px, var(--max)); margin-inline: auto; }
.narrow { max-width: 820px; }
.muted { color: var(--muted); }
.small { font-size: .9rem; }
.center { text-align: center; }
.eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: .14em;
  font-size: .75rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: .6rem;
}
.lead { font-size: 1.15rem; color: var(--text-2); }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- Header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap { display: flex; align-items: center; gap: 1rem; min-height: 64px; }
.brand { display: flex; align-items: center; gap: .6rem; font-weight: 800; font-size: 1.15rem; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand img { width: 34px; height: 34px; }
.site-nav { display: flex; align-items: center; gap: .25rem; margin-left: auto; }
.site-nav a { color: var(--text-2); padding: .5rem .75rem; border-radius: 8px; font-weight: 500; }
.site-nav a:hover { color: var(--text); background: var(--card); text-decoration: none; }
.site-nav a.active { color: var(--text); background: var(--card); }
.site-nav .btn { margin-left: .5rem; }
.nav-toggle, .theme-toggle {
  background: var(--card); color: var(--text); border: 1px solid var(--line);
  border-radius: 8px; width: 40px; height: 40px; cursor: pointer; display: inline-grid; place-items: center;
}
.nav-toggle { display: none; margin-left: auto; }
.theme-toggle svg { width: 18px; height: 18px; }
@media (max-width: 900px) {
  .nav-toggle { display: inline-grid; }
  .site-nav {
    display: none; position: absolute; left: 0; right: 0; top: 64px;
    flex-direction: column; align-items: stretch; gap: .25rem;
    background: var(--bg-2); border-bottom: 1px solid var(--line); padding: .75rem 16px 1rem;
  }
  .site-nav.open { display: flex; }
  .site-nav .btn { margin: .5rem 0 0; }
  .theme-toggle { align-self: flex-start; }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .5rem;
  padding: .7rem 1.2rem; border-radius: 10px; font-weight: 700; border: 1px solid var(--line);
  background: var(--card); color: var(--text); cursor: pointer; transition: transform .12s ease, background .12s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); background: var(--card-2); }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.btn-primary:hover { background: var(--accent-2); color: var(--accent-ink); }
.btn-lg { padding: .9rem 1.5rem; font-size: 1.05rem; }
.btn svg { width: 18px; height: 18px; }

/* ---------- Hero ---------- */
.hero {
  position: relative; overflow: hidden;
  padding: clamp(3rem, 8vw, 6.5rem) 0 clamp(2rem, 5vw, 4rem);
  background:
    radial-gradient(900px 420px at 15% -10%, color-mix(in srgb, var(--accent) 22%, transparent), transparent 60%),
    radial-gradient(700px 380px at 95% 10%, color-mix(in srgb, var(--accent) 10%, transparent), transparent 60%);
}
.hero-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 3rem; align-items: center; }
.hero h1 span { color: var(--accent); }
.hero .actions { display: flex; flex-wrap: wrap; gap: .75rem; margin: 1.5rem 0 1rem; }
.hero .meta { color: var(--muted); font-size: .9rem; display: flex; flex-wrap: wrap; gap: .4rem 1.2rem; }
.hero .meta code { font-size: .85em; }
.hero-shots { display: flex; justify-content: center; gap: 1.2rem; align-items: flex-end; }
.phone {
  width: clamp(150px, 16vw, 230px); aspect-ratio: 1080 / 2340; border-radius: 26px;
  border: 6px solid #0a0d0f; background: #0a0d0f; box-shadow: var(--shadow); overflow: hidden; position: relative;
}
.phone img { width: 100%; height: 100%; object-fit: cover; }
.phone.tilt-l { transform: rotate(-4deg) translateY(16px); }
.phone.tilt-r { transform: rotate(4deg) translateY(16px); }
.hero-shots .phone { flex: 0 1 auto; min-width: 0; }
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-shots { margin-top: 1rem; gap: .8rem; }
  .phone.tilt-l, .phone.tilt-r { transform: none; }
}
@media (max-width: 640px) {
  .hero-shots .phone { width: 27vw; border-width: 4px; border-radius: 18px; }
  .hero .actions .btn-lg { padding: .75rem 1.1rem; font-size: 1rem; }
}

/* ---------- Sections / cards ---------- */
section { padding: clamp(2.5rem, 6vw, 4.5rem) 0; }
section.alt { background: var(--bg-2); border-block: 1px solid var(--line); }
.section-head { max-width: 760px; margin-bottom: 2rem; }
.grid { display: grid; gap: 1.2rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 1000px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 1.4rem; box-shadow: 0 1px 0 rgba(255,255,255,.02) inset;
}
.card h3 { margin-top: .2rem; }
.card .icon {
  width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; margin-bottom: .9rem;
  background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent);
}
.card .icon svg { width: 22px; height: 22px; }
.card p:last-child { margin-bottom: 0; }
.card.link { transition: transform .12s ease, border-color .12s ease; color: inherit; display: block; }
.card.link:hover { transform: translateY(-2px); border-color: var(--accent); text-decoration: none; }
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1rem; }
.stat { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.2rem; text-align: center; }
.stat b { display: block; font-size: 2rem; font-weight: 800; color: var(--accent); letter-spacing: -.02em; }
.stat span { color: var(--muted); font-size: .9rem; }
@media (max-width: 760px) { .stats { grid-template-columns: repeat(2, 1fr); } }

.pill { display: inline-block; padding: .15rem .6rem; border-radius: 999px; font-size: .78rem; font-weight: 700; border: 1px solid var(--line); background: var(--card-2); color: var(--text-2); }
.pill.ok { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, transparent); }
.pill.warn { color: var(--warn); border-color: color-mix(in srgb, var(--warn) 40%, transparent); }
.pill.no { color: var(--danger); border-color: color-mix(in srgb, var(--danger) 40%, transparent); }

.callout { border-left: 4px solid var(--accent); background: var(--card); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; padding: 1rem 1.2rem; margin: 1.2rem 0; }
.callout.warn { border-left-color: var(--warn); }
.callout p:last-child { margin: 0; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-sm); }
table { width: 100%; border-collapse: collapse; font-size: .95rem; min-width: 560px; }
th, td { text-align: left; padding: .7rem .9rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { background: var(--card-2); font-weight: 700; white-space: nowrap; }
tr:last-child td { border-bottom: 0; }
td.c, th.c { text-align: center; }

/* ---------- Feature rows (alternating text/screenshot) ---------- */
.feature-row { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; padding: 2.5rem 0; }
.feature-row:not(:last-child) { border-bottom: 1px solid var(--line); }
.feature-row.flip .text { order: 2; }
.feature-row .shot { display: flex; justify-content: center; }
.feature-row ul { padding-left: 1.2rem; }
.feature-row li { margin-bottom: .4rem; }
@media (max-width: 860px) { .feature-row { grid-template-columns: 1fr; gap: 1.5rem; } .feature-row.flip .text { order: 0; } }

/* ---------- Gallery ---------- */
.gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 1.4rem; }
.gallery figure { margin: 0; }
.gallery .phone { width: 100%; cursor: zoom-in; }
.gallery figcaption { margin-top: .6rem; font-size: .9rem; color: var(--text-2); }
.gallery figcaption b { display: block; color: var(--text); }

.lightbox {
  position: fixed; inset: 0; z-index: 100; display: none; align-items: center; justify-content: center;
  background: rgba(0,0,0,.88); padding: 2rem;
}
.lightbox.open { display: flex; }
.lightbox img { max-height: 90vh; max-width: 92vw; border-radius: 18px; box-shadow: var(--shadow); }
.lightbox .cap { position: absolute; left: 0; right: 0; bottom: 1rem; text-align: center; color: #fff; font-size: .95rem; padding: 0 1rem; }
.lightbox button {
  position: absolute; top: 50%; transform: translateY(-50%); background: rgba(255,255,255,.12); color: #fff;
  border: 0; width: 46px; height: 46px; border-radius: 50%; font-size: 1.4rem; cursor: pointer;
}
.lightbox .prev { left: 1rem; } .lightbox .next { right: 1rem; }
.lightbox .close { top: 1rem; right: 1rem; transform: none; }

/* ---------- Docs layout ---------- */
.docs { display: grid; grid-template-columns: 240px 1fr; gap: 3rem; padding: 2.5rem 0 4rem; align-items: start; }
.docs-nav { position: sticky; top: 84px; }
.docs-nav h4 { text-transform: uppercase; letter-spacing: .1em; font-size: .72rem; color: var(--muted); margin: 1rem 0 .4rem; }
.docs-nav a { display: block; padding: .35rem .6rem; border-radius: 6px; color: var(--text-2); font-size: .95rem; }
.docs-nav a:hover { background: var(--card); text-decoration: none; color: var(--text); }
.docs-nav a.active { background: var(--card); color: var(--accent); font-weight: 600; }
.docs-body { min-width: 0; max-width: 820px; }
.docs-body h2 { margin-top: 2.2rem; padding-top: .6rem; border-top: 1px solid var(--line); }
.docs-body h2:first-of-type { margin-top: 0; border-top: 0; padding-top: 0; }
.docs-body h3 { margin-top: 1.6rem; }
.docs-body li { margin-bottom: .35rem; }
.docs-body img.inline-shot { width: 260px; border-radius: 16px; border: 4px solid #0a0d0f; float: right; margin: 0 0 1rem 1.5rem; }
.doc-footer-nav { display: flex; justify-content: space-between; gap: 1rem; margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--line); }
@media (max-width: 900px) {
  .docs { grid-template-columns: 1fr; gap: 1.5rem; }
  .docs-nav { position: static; display: flex; flex-wrap: wrap; gap: .3rem; }
  .docs-nav h4 { display: none; }
  .docs-body img.inline-shot { float: none; margin: 1rem auto; }
}

/* ---------- Steps ---------- */
.steps { counter-reset: step; list-style: none; padding: 0; margin: 0; }
.steps li { position: relative; padding-left: 3.2rem; margin-bottom: 1.3rem; }
.steps li::before {
  counter-increment: step; content: counter(step);
  position: absolute; left: 0; top: 0; width: 2.2rem; height: 2.2rem; border-radius: 50%;
  display: grid; place-items: center; font-weight: 800; background: var(--accent); color: var(--accent-ink);
}
.steps li b { display: block; font-size: 1.05rem; }

/* ---------- Architecture diagram ---------- */
.arch { display: grid; gap: .9rem; }
.arch-layer { display: grid; grid-template-columns: 140px 1fr; gap: 1rem; align-items: start; }
.arch-layer .label { font-weight: 800; color: var(--accent); font-size: .85rem; text-transform: uppercase; letter-spacing: .1em; padding-top: .9rem; }
.arch-boxes { display: flex; flex-wrap: wrap; gap: .6rem; }
.arch-box {
  background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: .6rem .85rem; font-size: .9rem;
}
.arch-box b { display: block; }
.arch-box span { color: var(--muted); font-size: .8rem; }
.arch-arrow { color: var(--muted); font-size: 1.3rem; line-height: 1; margin-left: calc(140px + 1rem); padding-left: 2rem; }
@media (max-width: 640px) { .arch-layer { grid-template-columns: 1fr; } .arch-layer .label { padding-top: 0; } .arch-arrow { margin-left: 0; } }

/* ---------- Changelog ---------- */
.cl-toolbar { display: flex; flex-wrap: wrap; gap: .8rem; align-items: center; margin-bottom: 1.5rem; }
.cl-toolbar input {
  flex: 1 1 260px; padding: .7rem .9rem; border-radius: 10px; border: 1px solid var(--line);
  background: var(--card); color: var(--text); font: inherit;
}
.cl-toolbar select { padding: .7rem .9rem; border-radius: 10px; border: 1px solid var(--line); background: var(--card); color: var(--text); font: inherit; }
.cl-series { margin-bottom: 1.2rem; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); overflow: hidden; }
.cl-series > summary { cursor: pointer; padding: 1rem 1.2rem; font-weight: 800; display: flex; align-items: center; gap: .8rem; list-style: none; }
.cl-series > summary::-webkit-details-marker { display: none; }
.cl-series > summary .count { margin-left: auto; font-weight: 500; color: var(--muted); font-size: .9rem; }
.cl-entry { border-top: 1px solid var(--line); padding: 1rem 1.2rem; }
.cl-entry h3 { display: flex; align-items: baseline; gap: .8rem; flex-wrap: wrap; font-size: 1.05rem; }
.cl-entry h3 .date { color: var(--muted); font-weight: 500; font-size: .9rem; }
.cl-entry ul { margin: .4rem 0 0; padding-left: 1.2rem; }
.cl-entry li { margin-bottom: .45rem; color: var(--text-2); }
.cl-entry mark { background: color-mix(in srgb, var(--warn) 45%, transparent); color: inherit; border-radius: 3px; padding: 0 .1em; }
.cl-empty { color: var(--muted); padding: 2rem; text-align: center; }

/* ---------- Timeline chart ---------- */
.chart { display: grid; grid-auto-flow: column; grid-auto-columns: 1fr; gap: .6rem; align-items: end; height: 180px; padding: 0 .2rem; }
.chart .bar { display: grid; grid-template-rows: 1fr auto auto; height: 100%; text-align: center; font-size: .78rem; color: var(--muted); }
.chart .bar i { align-self: end; display: block; background: linear-gradient(180deg, var(--accent), var(--accent-2)); border-radius: 6px 6px 2px 2px; min-height: 3px; }
.chart .bar b { color: var(--text); font-weight: 700; }

/* ---------- Release card ---------- */
.release-card { display: grid; grid-template-columns: 1fr auto; gap: 1.5rem; align-items: center; }
.release-card .ver { font-size: 2.2rem; font-weight: 800; letter-spacing: -.02em; }
.release-card .ver small { font-size: .95rem; color: var(--muted); font-weight: 500; margin-left: .6rem; }
.release-card dl { display: grid; grid-template-columns: auto 1fr; gap: .25rem 1rem; margin: .8rem 0 0; font-size: .95rem; }
.release-card dt { color: var(--muted); }
.release-card dd { margin: 0; }
@media (max-width: 700px) { .release-card { grid-template-columns: 1fr; } }

/* ---------- Copy button ---------- */
.copy-btn {
  position: absolute; top: .5rem; right: .5rem; font: inherit; font-size: .75rem; font-weight: 700;
  background: rgba(255,255,255,.1); color: #fff; border: 1px solid rgba(255,255,255,.15); border-radius: 6px; padding: .25rem .6rem; cursor: pointer;
}
.copy-btn:hover { background: rgba(255,255,255,.2); }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--line); background: var(--bg-2); padding: 3rem 0 2rem; color: var(--text-2); font-size: .95rem; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 2rem; }
.site-footer h4 { margin: 0 0 .6rem; color: var(--text); font-size: .95rem; }
.site-footer a { color: var(--text-2); display: block; padding: .15rem 0; }
.site-footer a:hover { color: var(--accent); }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; margin-top: 2rem; padding-top: 1rem; border-top: 1px solid var(--line); color: var(--muted); font-size: .85rem; }
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .footer-grid { grid-template-columns: 1fr; } }

/* ---------- Page header band ---------- */
.page-head { padding: clamp(2.5rem, 6vw, 4rem) 0 1.5rem; }
.page-head p.lead { max-width: 760px; }

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; } }
@media print { .site-header, .site-footer, .nav-toggle, .theme-toggle, .copy-btn { display: none !important; } body { background: #fff; color: #000; } }