/* NerLan docs site — single stylesheet, no build step.
   Structure follows the EinkBro docs site; palette is NerLan's own:
   indigo from the app's player controls, orange from the app icon. */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;700&family=JetBrains+Mono:wght@400;600&display=swap');

:root {
  --ink: #1c1b22;
  --paper: #fdfdfd;
  --mid: #5f5e66;
  --faint: #e6e5ee;
  --hairline: #d2d1dc;
  --wash: #f4f4f9;
  --accent: #4355b9;
  --accent-soft: #e2e6f9;
  --warm: #e8871e;
  --font-body: 'Noto Sans TC', system-ui, -apple-system, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Menlo', monospace;
  --max-w: 1120px;
  --nav-h: 56px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 24px);
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.7;
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }

h1, h2, h3, h4 { line-height: 1.3; font-weight: 700; }

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--wash);
  border: 1px solid var(--faint);
  border-radius: 4px;
  padding: 0.1em 0.35em;
}

pre {
  background: var(--ink);
  color: var(--paper);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
}
pre code { background: none; border: none; color: inherit; padding: 0; }

/* ---------- Nav ---------- */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: var(--nav-h);
  background: rgba(253, 253, 253, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--hairline);
}

.site-nav .container {
  height: 100%;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.site-nav__logo {
  font-weight: 700;
  font-size: 1.15rem;
  text-decoration: none;
  color: var(--ink);
}
.site-nav__logo .dot { color: var(--warm); }

.site-nav__links {
  display: flex;
  gap: 1.25rem;
  list-style: none;
  margin: 0 0 0 auto;
  padding: 0;
}

.site-nav__links a {
  text-decoration: none;
  color: var(--mid);
  font-weight: 500;
}
.site-nav__links a:hover, .site-nav__links a.active { color: var(--accent); }

.site-nav__lang {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
}
.site-nav__lang a { text-decoration: none; color: var(--mid); }
.site-nav__lang a.current { color: var(--accent); font-weight: 700; }
.site-nav__lang-sep { color: var(--hairline); }

.nav-toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 1px solid var(--hairline);
  border-radius: 6px;
  font-size: 1.1rem;
  padding: 0.15rem 0.5rem;
  cursor: pointer;
  color: var(--ink);
}

/* ---------- Hero ---------- */

.hero {
  background: linear-gradient(180deg, var(--wash) 0%, var(--paper) 100%);
  border-bottom: 1px solid var(--faint);
}

.hero .container {
  display: flex;
  align-items: center;
  gap: 3rem;
  padding-top: 4rem;
  padding-bottom: 4rem;
}

.hero__copy { flex: 1; }

.hero__copy h1 {
  font-size: 2.6rem;
  margin: 0 0 1rem;
  letter-spacing: -0.01em;
}

.hero__copy .tagline {
  font-size: 1.2rem;
  color: var(--mid);
  margin-bottom: 2rem;
}

.hero__cta { display: flex; gap: 0.9rem; flex-wrap: wrap; }

.btn {
  display: inline-block;
  padding: 0.65rem 1.4rem;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  border: 2px solid var(--accent);
}
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: #364598; border-color: #364598; }
.btn--ghost { color: var(--accent); }
.btn--ghost:hover { background: var(--accent-soft); }

/* Phone bezel drawn in CSS; overflow clips the screenshot so the inner
   corner radius stays parallel to the outer one. */
.hero__shot {
  width: 270px;
  flex-shrink: 0;
  border: 12px solid var(--ink);
  border-radius: 34px;
  background: var(--ink);
  overflow: hidden;
  box-shadow: 0 24px 48px rgba(28, 27, 34, 0.18);
}
.hero__shot img { display: block; width: 100%; height: auto; }

/* ---------- Feature cards ---------- */

.features { padding: 4rem 0; }

.features h2, .gallery h2 { font-size: 1.8rem; margin: 0 0 2rem; }

.features__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.feature-card {
  display: block;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 1.4rem;
  transition: border-color 0.15s, transform 0.15s;
}
.feature-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}
.feature-card svg { width: 28px; height: 28px; fill: var(--warm); }
.feature-card h3 { margin: 0.7rem 0 0.4rem; font-size: 1.05rem; }
.feature-card p { margin: 0; color: var(--mid); font-size: 0.92rem; }

/* ---------- Gallery ---------- */

.gallery { padding: 0 0 4.5rem; }

.gallery__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem 1.5rem;
}

/* Caption above the image without reordering markup. */
.gallery__item {
  margin: 0;
  display: flex;
  flex-direction: column-reverse;
}
.gallery__item img {
  width: 100%;
  height: auto;
  border: 1px solid var(--hairline);
  border-radius: 14px;
}
.gallery__item h3 { margin: 0 0 0.2rem; font-size: 1rem; }
.gallery__item p { margin: 0 0 0.8rem; color: var(--mid); font-size: 0.9rem; }

/* ---------- Guide layout ---------- */

.guide-layout {
  display: grid;
  grid-template-columns: 230px 1fr;
  gap: 3rem;
  padding-top: 2.5rem;
  padding-bottom: 4rem;
}

.guide-sidebar {
  position: sticky;
  top: calc(var(--nav-h) + 1.5rem);
  align-self: start;
  max-height: calc(100vh - var(--nav-h) - 3rem);
  overflow-y: auto;
  font-size: 0.92rem;
}

.toc-section {
  font-weight: 700;
  margin: 1.2rem 0 0.3rem;
  color: var(--ink);
}
.toc-section:first-child { margin-top: 0; }

.guide-sidebar ul { list-style: none; margin: 0; padding: 0; }
.guide-sidebar li { margin: 0.25rem 0; }
.guide-sidebar a { text-decoration: none; color: var(--mid); }
.guide-sidebar a:hover { color: var(--accent); }

.guide-main { min-width: 0; }
.guide-main section { margin-bottom: 3rem; }
.guide-main h2 {
  font-size: 1.5rem;
  border-bottom: 2px solid var(--faint);
  padding-bottom: 0.4rem;
  margin: 0 0 1rem;
}
.guide-main h3 { font-size: 1.15rem; margin: 1.6rem 0 0.6rem; }

.device-img {
  width: 300px;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--hairline);
  border-radius: 14px;
  margin: 0.8rem 0;
}

.img-row { display: flex; gap: 1rem; flex-wrap: wrap; }

/* Setting reference rows */
.setting-item {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 1rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--faint);
}
.setting-item__name { font-weight: 700; }
.setting-item__desc { color: var(--mid); }

.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 4px;
  padding: 0.05rem 0.45rem;
  margin-right: 0.4rem;
  vertical-align: 0.1em;
}

.note {
  background: var(--wash);
  border-left: 4px solid var(--warm);
  border-radius: 0 8px 8px 0;
  padding: 0.8rem 1.1rem;
  margin: 1rem 0;
}

/* Widget cards: screenshot + name + description, replacing a table whose
   narrow first column wrapped the CJK widget names character by character. */
.widget-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin: 1rem 0;
}
.widget-card {
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 1rem;
}
.widget-card img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--faint);
}
.widget-card h3 {
  margin: 0.7rem 0 0.3rem;
  font-size: 1.05rem;
  white-space: nowrap;
}
.widget-card p { margin: 0; color: var(--mid); font-size: 0.92rem; }

/* Tables */
.table-wrap { overflow-x: auto; }

/* CJK labels used as row names must never wrap character-by-character. */
td strong { white-space: nowrap; }

table {
  border-collapse: separate;
  border-spacing: 0;
  width: 100%;
  border: 1px solid var(--hairline);
  border-radius: 10px;
  overflow: hidden;
  font-size: 0.95rem;
}
th, td {
  text-align: left;
  padding: 0.6rem 0.9rem;
  border-bottom: 1px solid var(--faint);
  vertical-align: top;
}
tr:last-child td { border-bottom: none; }
th { background: var(--wash); }

/* ---------- Download page ---------- */

.download-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin: 2rem 0 3rem;
}

.download-card {
  border: 1px solid var(--hairline);
  border-radius: 12px;
  padding: 1.5rem;
}
.download-card h3 { margin-top: 0; }

.changelog-version {
  border-bottom: 1px solid var(--faint);
  padding: 1.2rem 0;
}
.changelog-version h3 {
  font-size: 1.3rem;
  margin: 0 0 0.4rem;
  color: var(--accent);
}
.changelog-version h4 { margin: 0.9rem 0 0.3rem; }
.changelog-version ul { margin: 0.2rem 0 0.6rem; }

/* ---------- Page header / footer ---------- */

.page-header { padding: 2.5rem 0 0; }
.page-header h1 { font-size: 2rem; margin: 0 0 0.4rem; }
.page-header p { color: var(--mid); margin: 0; }

.site-footer {
  border-top: 1px solid var(--hairline);
  padding: 2rem 0 3rem;
  color: var(--mid);
  font-size: 0.9rem;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .features__grid, .gallery__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .site-nav__links {
    display: none;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--hairline);
    flex-direction: column;
    gap: 0;
    padding: 0.5rem 24px 1rem;
  }
  .site-nav__links.open { display: flex; }
  .site-nav__links li { padding: 0.35rem 0; }

  .hero .container { flex-direction: column-reverse; text-align: center; }
  .hero__cta { justify-content: center; }
  .hero__copy h1 { font-size: 2rem; }
  .hero__shot { width: 230px; }

  .guide-layout { grid-template-columns: 1fr; gap: 1.5rem; }
  .guide-sidebar {
    position: static;
    max-height: none;
    border-bottom: 1px solid var(--hairline);
    padding-bottom: 1rem;
  }
  .setting-item { grid-template-columns: 1fr; gap: 0.15rem; }
  .download-cards { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .features__grid, .gallery__grid { grid-template-columns: 1fr; }
  .device-img { width: 100%; }
  .widget-list { grid-template-columns: 1fr; }
}