:root {
  --panel-dark: #141820;
  --panel-dark-mid: #1c2230;
  --panel-accent: #e8a838;
  --panel-accent-soft: rgba(232, 168, 56, 0.15);
  --panel-text: #e8eaed;
  --panel-muted: #8b93a7;
  --content-bg: #f4f6f9;
  --content-surface: #ffffff;
  --content-ink: #2c3340;
  --content-soft: #5a6478;
  --content-border: #dde2ea;
  --content-accent: #c97820;
  --content-accent-hover: #a86212;
  --shadow: 0 4px 24px rgba(20, 24, 32, 0.08);
  --panel-w: 40%;
  --font: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 1.5rem;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.82;
  color: var(--content-ink);
  background: var(--content-bg);
  min-height: 100vh;
}

img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--content-accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover { color: var(--content-accent-hover); }

/* ── Split shell ── */
.site-shell {
  display: flex;
  min-height: 100vh;
}

.side-panel {
  position: fixed;
  inset: 0 auto 0 0;
  width: var(--panel-w);
  height: 100vh;
  background: linear-gradient(175deg, var(--panel-dark) 0%, var(--panel-dark-mid) 100%);
  color: var(--panel-text);
  display: flex;
  flex-direction: column;
  z-index: 300;
  overflow-y: auto;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
}

.side-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 50% at 20% 0%, rgba(232, 168, 56, 0.08), transparent 60%);
  pointer-events: none;
}

.side-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: 2rem 2.25rem 1.75rem;
}

.panel-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--panel-text);
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.panel-brand img {
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.panel-brand b { color: var(--panel-accent); font-weight: 700; }

.panel-tagline {
  font-size: 0.78rem;
  color: var(--panel-muted);
  letter-spacing: 0.04em;
  margin: 0 0 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.panel-nav { flex: 1; }

.panel-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.panel-nav > ul > li { margin-bottom: 0.15rem; }

.panel-nav a {
  display: block;
  padding: 0.55rem 0.85rem;
  color: var(--panel-muted);
  font-size: 0.92rem;
  border-radius: 8px;
  transition: background 0.2s, color 0.2s;
}

.panel-nav a:hover,
.panel-nav a.active {
  color: var(--panel-text);
  background: var(--panel-accent-soft);
}

.panel-nav a.active { border-left: 3px solid var(--panel-accent); padding-left: calc(0.85rem - 3px); }

.panel-section-label {
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--panel-muted);
  margin: 1.5rem 0 0.65rem;
  padding-left: 0.85rem;
}

.panel-ext-links {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-top: 0.5rem;
}

.panel-ext-links a {
  font-size: 0.82rem;
  color: var(--panel-accent);
  padding: 0.35rem 0.85rem;
}

.panel-ext-links a:hover { color: #f0c060; }

.panel-footer {
  margin-top: auto;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 0.75rem;
  color: var(--panel-muted);
}

.panel-footer a { color: var(--panel-muted); font-size: 0.75rem; }
.panel-footer a:hover { color: var(--panel-accent); }

/* ── Content panel ── */
.content-panel {
  margin-left: var(--panel-w);
  width: calc(100% - var(--panel-w));
  min-height: 100vh;
  background: var(--content-bg);
}

.content-inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 2rem 3rem;
}

/* ── Mobile toggle ── */
.nav-toggle {
  display: none;
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 400;
  flex-direction: column;
  gap: 5px;
  background: var(--panel-dark);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 8px;
  padding: 8px 10px;
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--panel-accent);
}

.panel-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 250;
}

/* ── Ads ── */
.ads-top-bar {
  background: var(--content-surface);
  border-bottom: 1px solid var(--content-border);
  padding: 0.65rem 2rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.applist-title {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--content-soft);
  margin-bottom: 0.35rem;
}

#ads {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  margin: 8px 0;
  gap: 0.5rem;
}

#ads > div,
#ads .ads-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 70px;
}

#ads img {
  width: 65px;
  height: 65px;
  object-fit: cover;
  border-radius: 10px;
  border: 1px solid var(--content-border);
  transition: transform 0.18s, box-shadow 0.18s;
}

#ads a { display: inline-block; }

#ads img:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(201, 120, 32, 0.2);
}

#ads .caption {
  margin-top: 4px;
  font-size: 10px;
  line-height: 1.3;
  text-align: center;
  color: var(--content-soft);
  max-width: 70px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ── Hero & sections ── */
.hero-block {
  padding: 2.5rem 0 2rem;
}

.hero-block h1 {
  font-size: clamp(1.35rem, 3.2vw, 1.85rem);
  font-weight: 700;
  line-height: 1.4;
  margin: 0 0 1rem;
  color: var(--content-ink);
}

.hero-block .lead {
  font-size: 1.02rem;
  color: var(--content-soft);
  margin: 0 0 1.25rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: center;
  margin-top: 1.5rem;
}

.hero-visual img {
  border-radius: 14px;
  box-shadow: var(--shadow);
  border: 1px solid var(--content-border);
}

.chip-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.5rem 0 1.5rem;
}

.chip-nav a {
  font-size: 0.82rem;
  padding: 0.4rem 0.9rem;
  background: var(--content-surface);
  border: 1px solid var(--content-border);
  border-radius: 999px;
  color: var(--content-soft);
}

.chip-nav a:hover {
  border-color: var(--content-accent);
  color: var(--content-accent);
  background: #fffaf3;
}

.section-block {
  padding: 1.75rem 0;
  border-top: 1px solid var(--content-border);
}

.content-card {
  background: var(--content-surface);
  border: 1px solid var(--content-border);
  border-radius: 14px;
  padding: 1.75rem 2rem;
  box-shadow: var(--shadow);
}

.section-label {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--content-accent);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.content-card h2 {
  font-size: 1.2rem;
  font-weight: 700;
  margin: 0 0 1rem;
  color: var(--content-ink);
}

.prose p { margin: 0 0 1rem; color: var(--content-soft); }
.prose strong { color: var(--content-ink); }
.prose ul, .prose ol { margin: 0 0 1rem; padding-left: 1.35rem; color: var(--content-soft); }
.prose li { margin-bottom: 0.35rem; }
.prose code {
  font-size: 0.88em;
  background: #f0f2f6;
  padding: 0.12em 0.4em;
  border-radius: 4px;
  color: var(--content-ink);
}

.split-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
  align-items: center;
  margin: 1.25rem 0;
}

.split-row img {
  border-radius: 12px;
  border: 1px solid var(--content-border);
  box-shadow: var(--shadow);
}

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

.media-card {
  background: var(--content-bg);
  border: 1px solid var(--content-border);
  border-radius: 12px;
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s;
}

.media-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.media-card img {
  aspect-ratio: 16/10;
  object-fit: cover;
  width: 100%;
}

.media-card-body { padding: 0.85rem 1rem 1rem; }

.media-card-body h3 {
  margin: 0 0 0.35rem;
  font-size: 0.92rem;
  color: var(--content-ink);
}

.media-card-body p {
  margin: 0;
  font-size: 0.82rem;
  color: var(--content-soft);
  line-height: 1.6;
}

.link-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  padding: 1rem 0 0.5rem;
  font-size: 0.88rem;
}

.link-strip a::before {
  content: "↗ ";
  opacity: 0.5;
}

/* ── Inner pages ── */
.page-hero {
  padding: 2rem 0 1.25rem;
}

.page-hero h1 {
  margin: 0.5rem 0 0;
  font-size: 1.65rem;
  font-weight: 700;
}

.breadcrumb {
  font-size: 0.82rem;
  color: var(--content-soft);
}

.breadcrumb a { color: var(--content-accent); }

.related-reading {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px dashed var(--content-border);
}

.related-reading h2 {
  font-size: 1rem;
  margin: 0 0 0.75rem;
  color: var(--content-ink);
}

.related-reading ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.related-reading li {
  margin-bottom: 0.45rem;
  font-size: 0.88rem;
}

.related-reading li::before { content: "› "; color: var(--content-accent); }

.content-footer {
  padding: 1.5rem 2rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--content-soft);
  border-top: 1px solid var(--content-border);
}

/* ── Error pages ── */
.error-wrap {
  text-align: center;
  padding: 4rem 0;
}

.error-wrap .code {
  font-size: 4.5rem;
  font-weight: 700;
  color: var(--content-accent);
  margin: 0;
  line-height: 1;
}

.error-wrap h1 { margin: 0.75rem 0 1rem; font-size: 1.3rem; }
.error-wrap p { color: var(--content-soft); }

/* ── Responsive ── */
@media (max-width: 960px) {
  .hero-grid, .split-row, .card-grid { grid-template-columns: 1fr; }

  .nav-toggle { display: flex; }

  .side-panel {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
    width: min(320px, 85vw);
  }

  .side-panel.is-open { transform: translateX(0); }

  .panel-overlay.is-visible { display: block; }

  .content-panel {
    margin-left: 0;
    width: 100%;
  }

  .content-inner { padding: 0 1.25rem 2.5rem; padding-top: 3.5rem; }

  .ads-top-bar { padding: 0.6rem 1.25rem; }

  #ads {
    flex-wrap: nowrap;
    overflow-x: auto;
    scroll-snap-type: x proximity;
    justify-content: flex-start;
    -webkit-overflow-scrolling: touch;
  }

  #ads::-webkit-scrollbar { display: none; }

  #ads > div,
  #ads .ads-item {
    width: 84px;
    flex-shrink: 0;
    scroll-snap-align: center;
  }
}