/* =========================================================
   Variant B — Left Sidebar (Olive Green Accent)
   Editorial Magazine · Times Serif · Two-Tone
   ========================================================= */

:root {
  --color-ink: #0d0d0d;
  --color-paper: #fbf9f4;
  --color-mist: #f0ecdf;
  --color-line: #0d0d0d;
  --color-muted: #6b6b64;
  --color-accent: #5a7a3a;
  --color-accent-soft: #cfd9b9;
  --color-accent-deep: #3f5a23;

  --w-max: 920px;
  --w-gutter: 24px;
  --w-sidebar: 248px;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 16px;
  --space-4: 24px;
  --space-5: 40px;
  --space-6: 64px;
  --space-7: 96px;
  --space-8: 128px;

  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --font-serif: "Times New Roman", "Georgia", "Songti SC", "Source Han Serif SC", serif;
  --font-mono: "JetBrains Mono", "SF Mono", Menlo, Consolas, monospace;

  --line-thin: 1px;
  --line-mid: 2px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-ink);
  background: var(--color-paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.container {
  max-width: var(--w-max);
  margin: 0 auto;
  padding-left: var(--w-gutter);
  padding-right: var(--w-gutter);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-ink);
  color: var(--color-paper);
  padding: 8px 16px;
  z-index: 999;
}
.skip-link:focus { left: 16px; top: 16px; }

/* ===== Layout shell ===== */
.shell {
  display: grid;
  grid-template-columns: var(--w-sidebar) 1fr;
  min-height: 100vh;
  background: var(--color-paper);
}

/* ===== Sidebar ===== */
.sidebar {
  background: var(--color-ink);
  color: var(--color-paper);
  padding: var(--space-5) var(--space-4);
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  border-right: var(--line-mid) solid var(--color-ink);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.01em;
}
.sidebar-brand img { width: 26px; height: 26px; }

.sidebar-nav {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.sidebar-nav li {
  counter-increment: nav-counter;
}
.sidebar-nav a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  font-family: var(--font-serif);
  font-size: 16px;
  border-bottom: var(--line-thin) solid rgba(255,255,255,0.15);
  transition: color 0.15s ease;
}
.sidebar-nav a::before {
  content: "0" counter(nav-counter);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent-soft);
  letter-spacing: 0.05em;
  min-width: 24px;
}
.sidebar-nav a:hover,
.sidebar-nav a:focus-visible { color: var(--color-accent-soft); outline: none; }
.sidebar-nav a[aria-current="page"] { color: var(--color-accent-soft); }

.sidebar { counter-reset: nav-counter; }

.sidebar-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: rgba(255,255,255,0.65);
  line-height: 1.7;
  border-top: var(--line-thin) solid rgba(255,255,255,0.2);
  padding-top: var(--space-3);
  margin-top: auto;
}

.sidebar-download {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 12px 16px;
  background: var(--color-accent);
  color: var(--color-paper);
  font-weight: 700;
  font-size: 14px;
  border: var(--line-mid) solid var(--color-accent);
  transition: background 0.15s ease, color 0.15s ease;
}
.sidebar-download:hover,
.sidebar-download:focus-visible {
  background: var(--color-paper);
  color: var(--color-ink);
  outline: none;
}

.sidebar-toggle {
  display: none;
  background: transparent;
  border: var(--line-mid) solid var(--color-paper);
  color: var(--color-paper);
  height: 40px;
  padding: 0 14px;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
  font-size: 14px;
}

/* ===== Main content ===== */
.main {
  padding: var(--space-6) 0;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin: 0 0 var(--space-4);
  display: inline-block;
  border-bottom: var(--line-mid) solid var(--color-ink);
  padding-bottom: 6px;
}

.hero-section {
  padding: 0 var(--space-3) var(--space-6);
}
.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(40px, 7vw, 78px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-4);
}
.hero-title em {
  font-style: italic;
  color: var(--color-accent);
  font-weight: 700;
}
.hero-lede {
  font-size: 16px;
  line-height: 1.7;
  max-width: 56ch;
  margin: 0 0 var(--space-5);
  color: var(--color-ink);
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 46px;
  padding: 0 22px;
  font-size: 14px;
  font-weight: 700;
  font-family: inherit;
  border: var(--line-mid) solid var(--color-ink);
  border-radius: 0;
  cursor: pointer;
  letter-spacing: 0.01em;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  text-align: center;
  line-height: 1;
}
.btn-primary {
  background: var(--color-accent);
  color: var(--color-paper);
  border-color: var(--color-accent);
}
.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--color-ink);
  border-color: var(--color-ink);
  color: var(--color-paper);
  outline: none;
}
.btn-secondary {
  background: var(--color-paper);
  color: var(--color-ink);
  border-color: var(--color-ink);
}
.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: var(--color-ink);
  color: var(--color-paper);
  outline: none;
}
.btn-small { height: 36px; padding: 0 14px; font-size: 13px; }

:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.hero-cta {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

/* ===== Section ===== */
.section {
  padding: var(--space-6) var(--space-3);
  border-top: var(--line-mid) solid var(--color-ink);
}
.section-head { margin-bottom: var(--space-5); }
.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin: 0 0 var(--space-2);
}
.section-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3.6vw, 42px);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 0;
}
.section-title em { font-style: italic; color: var(--color-accent); }

/* ===== Pull quote ===== */
.pull-quote {
  background: var(--color-accent-soft);
  border-left: 6px solid var(--color-accent);
  padding: var(--space-5) var(--space-4);
  margin: var(--space-5) 0;
  font-family: var(--font-serif);
  font-size: clamp(20px, 2.4vw, 26px);
  line-height: 1.4;
  font-style: italic;
  color: var(--color-ink);
}
.pull-quote cite {
  display: block;
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-top: var(--space-3);
}

/* ===== Cap list ===== */
.cap-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.cap-list li {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-top: var(--line-mid) solid var(--color-ink);
  align-items: baseline;
}
.cap-list li:last-child { border-bottom: var(--line-mid) solid var(--color-ink); }
.cap-title {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
}
.cap-desc {
  font-size: 15px;
  line-height: 1.65;
  margin: 0;
}

/* ===== Scenes ===== */
.scene-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}
.scene-card {
  background: var(--color-paper);
  border: var(--line-mid) solid var(--color-ink);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.scene-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border: var(--line-thin) solid var(--color-ink);
}
.scene-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  margin: 0;
}
.scene-name {
  font-family: var(--font-serif);
  font-size: 24px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
}
.scene-desc {
  font-size: 14px;
  line-height: 1.65;
  margin: 0;
  color: var(--color-muted);
}

/* ===== Platforms ===== */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0;
  border-top: var(--line-mid) solid var(--color-ink);
  border-bottom: var(--line-mid) solid var(--color-ink);
}
.platform-grid.cols-6 { grid-template-columns: repeat(6, 1fr); }
.platform-grid > div {
  padding: var(--space-3) 0;
  border-right: var(--line-thin) solid var(--color-ink);
  text-align: center;
  font-weight: 700;
  font-size: 14px;
}
.platform-grid > div:last-child { border-right: none; }

/* ===== Value bar ===== */
.value-bar {
  background: var(--color-accent);
  color: var(--color-paper);
  padding: var(--space-5) var(--space-3);
  border-top: var(--line-mid) solid var(--color-ink);
  border-bottom: var(--line-mid) solid var(--color-ink);
}
.value-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.value-item h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}
.value-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  opacity: 0.95;
}

/* ===== Download page ===== */
.dl-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
.dl-card {
  border: var(--line-mid) solid var(--color-ink);
  padding: var(--space-4);
  background: var(--color-paper);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.dl-card h3 {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.01em;
}
.dl-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
  letter-spacing: 0.05em;
}
.dl-card p { margin: 0; font-size: 14px; line-height: 1.65; }
.dl-card .btn { margin-top: auto; }

/* ===== FAQ ===== */
.faq-item {
  border-top: var(--line-mid) solid var(--color-ink);
  padding: var(--space-4) 0;
}
.faq-item:last-child { border-bottom: var(--line-mid) solid var(--color-ink); }
.faq-q {
  font-family: var(--font-serif);
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 var(--space-2);
  letter-spacing: -0.01em;
}
.faq-a {
  font-size: 15px;
  line-height: 1.7;
  margin: 0;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  gap: 8px;
  font-size: 13px;
  color: var(--color-muted);
  padding: var(--space-3) var(--space-3);
  border-bottom: var(--line-thin) solid var(--color-ink);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}
.breadcrumb a:hover { text-decoration: underline; }

/* ===== Footer ===== */
.site-footer {
  background: var(--color-mist);
  border-top: var(--line-mid) solid var(--color-ink);
  padding: var(--space-5) var(--space-3) var(--space-3);
  margin-top: var(--space-6);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-4);
}
.footer-grid h4 {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 var(--space-3);
}
.footer-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.footer-grid li { margin: 0 0 8px; }
.footer-grid a { font-size: 14px; }
.footer-grid a:hover { color: var(--color-accent); text-decoration: underline; }
.footer-brand p {
  font-size: 14px;
  line-height: 1.6;
  margin: var(--space-2) 0 0;
  color: var(--color-muted);
  max-width: 36ch;
}
.footer-bottom {
  border-top: var(--line-mid) solid var(--color-ink);
  padding-top: var(--space-3);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-muted);
  letter-spacing: 0.04em;
}

/* ===== Guide ===== */
.guide-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}
.guide-card {
  border: var(--line-mid) solid var(--color-ink);
  padding: var(--space-4);
  background: var(--color-paper);
}
.guide-card .step {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  font-weight: 700;
  margin: 0 0 var(--space-2);
}
.guide-card h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 var(--space-2);
  letter-spacing: -0.01em;
}
.guide-card ol {
  padding-left: 20px;
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
}
.guide-card ol li { margin-bottom: 4px; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar {
    position: relative;
    height: auto;
    min-height: auto;
    padding: var(--space-3) var(--space-4);
    gap: var(--space-3);
  }
  .sidebar-nav {
    flex-direction: column;
    display: none;
    border-top: var(--line-thin) solid rgba(255,255,255,0.2);
    padding-top: var(--space-3);
  }
  .sidebar-nav.show { display: flex; }
  .sidebar-meta { display: none; }
  .sidebar-toggle { display: inline-flex; align-items: center; }
  .sidebar-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
  }
  .value-grid { grid-template-columns: 1fr; gap: var(--space-3); }
  .cap-list li { grid-template-columns: 1fr; gap: var(--space-2); }
  .scene-grid { grid-template-columns: 1fr; }
  .platform-grid { grid-template-columns: repeat(2, 1fr); }
  .platform-grid > div { border-right: none; }
  .platform-grid > div:nth-child(odd) { border-right: var(--line-thin) solid var(--color-ink); }
  .dl-grid { grid-template-columns: 1fr; }
  .guide-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .main { padding: var(--space-5) 0; }
  .hero-section { padding: 0 var(--space-3) var(--space-5); }
  .section { padding: var(--space-5) var(--space-3); }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .hero-cta .btn { width: 100%; }
}