@import url('https://fonts.googleapis.com/css2?family=Lexend+Mega:wght@100..900&family=Public+Sans:wght@100..900&display=swap');

/* ============================================================
   CSS 变量
   ============================================================ */
:root {
  --c-bg: #0d0d0d;
  --c-bg2: #111118;
  --c-surface: rgba(20, 10, 40, 0.72);
  --c-surface2: rgba(30, 10, 60, 0.55);
  --c-primary: #8000ff;
  --c-accent: #ff00ff;
  --c-text: #e8e0ff;
  --c-text-dim: #9988bb;
  --c-border: rgba(128, 0, 255, 0.28);
  --c-border-bright: rgba(255, 0, 255, 0.5);
  --c-glow-p: 0 0 8px #8000ff, 0 0 20px rgba(128,0,255,0.4);
  --c-glow-a: 0 0 8px #ff00ff, 0 0 24px rgba(255,0,255,0.5);
  --c-glow-text: 0 0 6px #ff00ff, 0 0 14px rgba(255,0,255,0.6);
  --nav-w: 260px;
  --radius: 28px;
  --radius-sm: 14px;
  --font-head: 'Lexend Mega', 'Public Sans', system-ui, sans-serif;
  --font-body: 'Public Sans', 'Lexend Mega', system-ui, sans-serif;
  --transition: 0.2s ease;
}

/* ============================================================
   Reset & base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background: var(--c-bg);
  color: var(--c-text);
}

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  background: var(--c-bg);
  min-height: 100vh;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--c-accent); text-decoration: none; transition: color var(--transition), text-shadow var(--transition); }
a:hover { color: #fff; text-shadow: var(--c-glow-text); }
a:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 3px; border-radius: 4px; }

ul, menu { list-style: none; }
h1,h2,h3,h4,h5,h6 { font-family: var(--font-head); line-height: 1.2; letter-spacing: -0.02em; }

hr {
  border: none;
  border-top: 1px solid var(--c-border-bright);
  margin: 1.2rem 0 1.6rem;
  box-shadow: 0 0 6px rgba(255,0,255,0.3);
}

/* ============================================================
   Scanlines overlay
   ============================================================ */
.scanlines {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0px,
    transparent 3px,
    rgba(0,0,0,0.08) 3px,
    rgba(0,0,0,0.08) 4px
  );
}

/* ============================================================
   Site wrapper & left nav
   ============================================================ */
.site-wrapper {
  display: flex;
  min-height: 100vh;
  position: relative;
}

/* ── details/summary nav ── */
.nav-details {
  position: fixed;
  left: 0;
  top: 0;
  width: var(--nav-w);
  height: 100vh;
  z-index: 200;
  display: flex;
  flex-direction: column;
  background: linear-gradient(180deg, #0a0010 0%, #0d0d0d 100%);
  border-right: 1px solid var(--c-border);
  box-shadow: 2px 0 24px rgba(128,0,255,0.18);
  overflow: hidden;
}

.nav-details[open],
.nav-details:not([open]) {
  display: flex;
}

.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1rem;
  cursor: default;
  list-style: none;
  border-bottom: 1px solid var(--c-border);
  background: rgba(128, 0, 255, 0.06);
}
.nav-toggle::-webkit-details-marker { display: none; }

.nav-brand { display: flex; align-items: center; gap: 0.5rem; }
.brand-text-logo {
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 900;
  color: var(--c-accent);
  text-shadow: var(--c-glow-a);
  letter-spacing: 0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 170px;
}
.brand-logo-img { width: 120px; height: auto; }
.nav-toggle-icon { display: none; font-size: 1.5rem; color: var(--c-primary); }

.nav-menu {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.nav-menu::-webkit-scrollbar { width: 4px; }
.nav-menu::-webkit-scrollbar-thumb { background: var(--c-primary); border-radius: 2px; }

.nav-slogan {
  padding: 0.55rem 1.25rem;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--c-primary);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  text-shadow: var(--c-glow-p);
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 0.25rem;
}

.nav-menu li a {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.75rem 1.25rem;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--c-text-dim);
  line-height: 1.4;
  border-left: 3px solid transparent;
  transition: all var(--transition);
  min-height: 44px;
}
.nav-menu li a:hover,
.nav-menu li a[aria-current="page"] {
  color: #fff;
  background: rgba(128,0,255,0.12);
  border-left-color: var(--c-accent);
  text-shadow: var(--c-glow-text);
}
.nav-icon { color: var(--c-primary); flex-shrink: 0; margin-top: 1px; }
.nav-extra a { font-size: 0.75rem; opacity: 0.7; }
.nav-extra a:hover { opacity: 1; }

/* ============================================================
   Content area
   ============================================================ */
.content-area {
  margin-left: var(--nav-w);
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

/* ============================================================
   Hero — Home
   ============================================================ */
.hero-home {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, #0d0020 0%, #0d0d0d 60%, #1a0033 100%);
  padding: 4rem 2rem 7rem;
}
.hero-home::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 80% 50%, rgba(128,0,255,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 20% 80%, rgba(255,0,255,0.12) 0%, transparent 60%);
}
.hero-bg-text {
  position: absolute;
  right: -0.05em;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-head);
  font-size: clamp(8rem, 22vw, 18rem);
  font-weight: 900;
  color: transparent;
  -webkit-text-stroke: 1px rgba(128,0,255,0.15);
  user-select: none;
  pointer-events: none;
  letter-spacing: -0.05em;
  z-index: 0;
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 680px;
}
.hero-eyebrow {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-primary);
  text-shadow: var(--c-glow-p);
  margin-bottom: 1rem;
}
.hero-h1 {
  font-size: clamp(1.9rem, 5vw, 3.8rem);
  font-weight: 900;
  color: #fff;
  text-shadow: 0 0 30px rgba(128,0,255,0.5), 0 0 60px rgba(255,0,255,0.2);
  margin-bottom: 1.25rem;
  line-height: 1.1;
}
.hero-sub {
  font-size: 1.05rem;
  color: var(--c-text-dim);
  margin-bottom: 2rem;
  max-width: 520px;
}
.hero-cta { display: flex; gap: 1rem; flex-wrap: wrap; }

.hero-slant {
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 80px;
  background: var(--c-bg);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  z-index: 2;
}

/* Feature hero bar */
.feature-hero-bar {
  position: relative;
  background: linear-gradient(135deg, #0d0020 0%, #0d0d0d 100%);
  padding: 3rem 2rem 5rem;
  overflow: hidden;
  border-bottom: 1px solid var(--c-border);
}
.feature-hero-bar::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 50% 80% at 70% 50%, rgba(255,0,255,0.1) 0%, transparent 70%);
}
.feature-hero-media {
  position: absolute;
  right: 2rem;
  top: 50%;
  transform: translateY(-50%);
  width: 280px;
  opacity: 0.3;
  z-index: 0;
}
.feature-hero-text { position: relative; z-index: 1; max-width: 600px; }
.feature-hero-img { width: 100%; border-radius: var(--radius-sm); }

/* ============================================================
   Buttons
   ============================================================ */
.btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  color: #fff;
  background: linear-gradient(135deg, var(--c-primary) 0%, var(--c-accent) 100%);
  border-radius: 6px;
  clip-path: polygon(8px 0%, 100% 0%, calc(100% - 8px) 100%, 0% 100%);
  box-shadow: var(--c-glow-p);
  transition: all var(--transition);
  min-height: 44px;
  text-shadow: none;
}
.btn-primary:hover {
  box-shadow: var(--c-glow-a);
  transform: translateY(-2px);
  color: #fff;
}
.btn-ghost {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-head);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--c-accent);
  border: 1px solid var(--c-accent);
  border-radius: 6px;
  clip-path: polygon(8px 0%, 100% 0%, calc(100% - 8px) 100%, 0% 100%);
  background: transparent;
  transition: all var(--transition);
  min-height: 44px;
}
.btn-ghost:hover {
  background: rgba(255,0,255,0.1);
  box-shadow: var(--c-glow-a);
  color: #fff;
  text-shadow: var(--c-glow-text);
}

/* ============================================================
   Page header bar (inner pages)
   ============================================================ */
.page-header-bar {
  padding: 3rem 2rem 2.5rem;
  border-bottom: 1px solid var(--c-border);
  background: linear-gradient(180deg, rgba(128,0,255,0.06) 0%, transparent 100%);
}
.page-eyebrow {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--c-primary);
  text-shadow: var(--c-glow-p);
  margin-bottom: 0.6rem;
}
.page-h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.8rem);
  font-weight: 900;
  color: #fff;
  text-shadow: 0 0 20px rgba(128,0,255,0.4);
  margin-bottom: 0.5rem;
}
.page-sub {
  font-size: 1rem;
  color: var(--c-text-dim);
  max-width: 580px;
  margin-top: 0.5rem;
}
.article-meta {
  display: flex;
  gap: 1.25rem;
  font-size: 0.78rem;
  color: var(--c-text-dim);
  margin-top: 0.75rem;
  flex-wrap: wrap;
}
.article-meta time { color: var(--c-primary); }
.policy-date { display: block; font-size: 0.8rem; color: var(--c-text-dim); margin-top: 0.5rem; }

/* ============================================================
   Inner layout: aside + main
   ============================================================ */
.inner-layout {
  display: flex;
  flex: 1;
  align-items: flex-start;
  gap: 0;
}
.sidebar-left {
  width: 220px;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  align-self: flex-start;
  padding: 1.5rem 0 1.5rem 1.5rem;
  min-height: 200px;
}
.sidebar-inner {
  padding: 1.25rem;
}
.sidebar-label {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--c-primary);
  text-shadow: var(--c-glow-p);
  margin-bottom: 0.75rem;
}
.sidebar-links { display: flex; flex-direction: column; gap: 0; }
.sidebar-links li a {
  display: block;
  padding: 0.45rem 0.5rem;
  font-size: 0.8rem;
  color: var(--c-text-dim);
  border-left: 2px solid transparent;
  transition: all var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}
.sidebar-links li a:hover,
.sidebar-links li a[aria-current="page"] {
  color: var(--c-accent);
  border-left-color: var(--c-accent);
  padding-left: 0.85rem;
  text-shadow: 0 0 8px rgba(255,0,255,0.4);
}
.sidebar-sep { height: 1px; background: var(--c-border); margin: 0.75rem 0; }

.main-content {
  flex: 1;
  min-width: 0;
  padding: 2rem 2rem 2rem 1.5rem;
  max-width: 820px;
}

/* ============================================================
   Main home
   ============================================================ */
.main-home {
  flex: 1;
  padding: 0;
}
.main-home article { width: 100%; }

/* ============================================================
   Content sections
   ============================================================ */
.content-section {
  padding: 2.5rem 2rem;
  border-bottom: 1px solid rgba(128,0,255,0.1);
}
.main-home .content-section { padding: 2.5rem 2rem; }

.section-title, .neon-title {
  font-family: var(--font-head);
  font-size: clamp(1.2rem, 2.5vw, 1.75rem);
  font-weight: 900;
  color: #fff;
  text-shadow: var(--c-glow-a);
  margin-bottom: 0.4rem;
}

/* ============================================================
   Prose content
   ============================================================ */
.prose-content {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-text);
  max-width: 740px;
}
.prose-content h2 {
  font-size: 1.35rem;
  font-weight: 800;
  color: #fff;
  text-shadow: var(--c-glow-p);
  margin: 2rem 0 0.3rem;
}
.prose-content h2 + hr { margin-top: 0.3rem; }
.prose-content h3 {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--c-accent);
  margin: 1.5rem 0 0.5rem;
}
.prose-content p { margin-bottom: 1rem; }
.prose-content ul, .prose-content ol {
  padding-left: 1.5rem;
  margin-bottom: 1rem;
}
.prose-content li { margin-bottom: 0.35rem; }
.prose-content a { color: var(--c-accent); }
.prose-content strong { color: #fff; font-weight: 700; }
.prose-content blockquote {
  border-left: 3px solid var(--c-primary);
  padding: 0.75rem 1.25rem;
  margin: 1.25rem 0;
  background: rgba(128,0,255,0.07);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--c-text-dim);
  font-style: italic;
}
.prose-content code {
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.88rem;
  background: rgba(128,0,255,0.15);
  padding: 0.15em 0.45em;
  border-radius: 4px;
  color: var(--c-accent);
}
.prose-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.9rem;
}
.prose-content th {
  background: rgba(128,0,255,0.2);
  color: var(--c-accent);
  padding: 0.6rem 0.85rem;
  text-align: left;
  font-weight: 700;
  border-bottom: 1px solid var(--c-border-bright);
}
.prose-content td {
  padding: 0.55rem 0.85rem;
  border-bottom: 1px solid var(--c-border);
}

/* FAQ specific */
.faq-content details {
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
  background: var(--c-surface2);
  overflow: hidden;
}
.faq-content details summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 700;
  color: var(--c-text);
  transition: color var(--transition);
  min-height: 44px;
  display: flex;
  align-items: center;
  list-style: none;
}
.faq-content details summary::-webkit-details-marker { display: none; }
.faq-content details summary::before {
  content: '▷';
  color: var(--c-primary);
  margin-right: 0.75rem;
  font-size: 0.75rem;
  transition: transform var(--transition);
}
.faq-content details[open] summary::before { content: '▽'; }
.faq-content details[open] summary { color: var(--c-accent); }
.faq-content details > *:not(summary) { padding: 0 1.25rem 1rem; color: var(--c-text-dim); }

.faq-cta-section { text-align: left; }
.faq-cta-section p { margin-bottom: 1.25rem; color: var(--c-text-dim); }

/* ============================================================
   Glass card
   ============================================================ */
.glass-card {
  background: var(--c-surface);
  backdrop-filter: blur(16px) saturate(1.4);
  -webkit-backdrop-filter: blur(16px) saturate(1.4);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: 0 4px 32px rgba(0,0,0,0.4), inset 0 1px 0 rgba(255,255,255,0.04);
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.glass-card:hover {
  border-color: var(--c-border-bright);
  box-shadow: 0 8px 40px rgba(128,0,255,0.25), var(--c-glow-p);
  transform: translateY(-2px);
}

/* ============================================================
   Card grid
   ============================================================ */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  list-style: none;
}
.card-grid-sm {
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
}

.card-feature, .card-guide, .card-related {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.card-feature h3, .card-guide h3, .card-related h3 {
  font-size: 0.95rem;
  font-weight: 800;
  color: #fff;
  line-height: 1.3;
}
.card-feature h3 a, .card-guide h3 a, .card-related h3 a {
  color: #fff;
  text-decoration: none;
}
.card-feature h3 a:hover, .card-guide h3 a:hover, .card-related h3 a:hover {
  color: var(--c-accent);
  text-shadow: var(--c-glow-text);
}
.card-feature p, .card-guide p, .card-related p {
  font-size: 0.82rem;
  color: var(--c-text-dim);
  line-height: 1.6;
  flex: 1;
}
.card-date {
  font-size: 0.72rem;
  color: var(--c-primary);
  font-weight: 700;
  letter-spacing: 0.05em;
}
.card-link {
  display: inline-flex;
  align-items: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--c-accent);
  margin-top: 0.25rem;
  min-height: 40px;
}
.card-link:hover { text-shadow: var(--c-glow-text); }

/* ============================================================
   About values grid
   ============================================================ */
.values-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}
.value-card {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.value-icon {
  font-size: 1.5rem;
  color: var(--c-accent);
  text-shadow: var(--c-glow-a);
  font-family: var(--font-head);
  font-weight: 900;
}
.value-card strong { color: #fff; font-weight: 800; }
.value-card p { font-size: 0.82rem; color: var(--c-text-dim); }

/* ============================================================
   Breadcrumb
   ============================================================ */
.breadcrumb {
  padding: 0.85rem 2rem;
  font-size: 0.78rem;
  color: var(--c-text-dim);
  display: flex;
  gap: 0.4rem;
  flex-wrap: wrap;
  align-items: center;
  border-bottom: 1px solid var(--c-border);
  background: rgba(128,0,255,0.04);
}
.breadcrumb a { color: var(--c-primary); }
.breadcrumb a:hover { color: var(--c-accent); }
.breadcrumb span[aria-hidden] { opacity: 0.4; }

/* ============================================================
   Guide pagination
   ============================================================ */
.guide-pagination {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}
.guide-prev, .guide-next {
  flex: 1;
  min-width: 180px;
  padding: 1rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  text-decoration: none;
  color: var(--c-text);
}
.guide-prev:hover, .guide-next:hover { color: #fff; }
.pag-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--c-primary);
  font-weight: 700;
}
.pag-title { font-size: 0.88rem; font-weight: 700; line-height: 1.4; }
.guide-prev-empty, .guide-next-empty { flex: 1; }
.guide-nav-section { border-bottom: none; }
.guide-nav-section .sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  border-top: 1px solid var(--c-border);
  background: rgba(0,0,0,0.4);
  margin-top: auto;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 2rem;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-brand {
  font-family: var(--font-head);
  font-size: 1.1rem;
  font-weight: 900;
  color: var(--c-primary);
  text-shadow: var(--c-glow-p);
  letter-spacing: -0.02em;
}
.footer-nav {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}
.footer-nav a {
  font-size: 0.8rem;
  color: var(--c-text-dim);
  padding: 0.35rem 0.6rem;
  border-radius: 4px;
  transition: all var(--transition);
  min-height: 40px;
  display: flex;
  align-items: center;
}
.footer-nav a:hover { color: var(--c-accent); background: rgba(255,0,255,0.08); }
.footer-copy {
  font-size: 0.75rem;
  color: var(--c-text-dim);
  opacity: 0.7;
}

/* ============================================================
   Glitch effect
   ============================================================ */
@keyframes glitch {
  0%,90%,100% { transform: none; clip-path: none; text-shadow: 0 0 20px rgba(128,0,255,0.4); }
  92% { transform: skewX(-4deg) translateX(3px); clip-path: inset(20% 0 60% 0); color: var(--c-accent); text-shadow: -3px 0 var(--c-primary); }
  94% { transform: skewX(3deg) translateX(-3px); clip-path: inset(55% 0 20% 0); color: var(--c-primary); text-shadow: 3px 0 var(--c-accent); }
  96% { transform: none; clip-path: none; }
}
.glitch {
  position: relative;
  animation: glitch 6s infinite;
}

/* ============================================================
   Parallax / hover micro-interactions
   ============================================================ */
@media (prefers-reduced-motion: no-preference) {
  .glass-card { transition: transform 0.22s ease, border-color 0.22s ease, box-shadow 0.22s ease; }
  .btn-primary, .btn-ghost { transition: all 0.18s ease; }
  .nav-menu li a { transition: all 0.15s ease; }
}
@media (prefers-reduced-motion: reduce) {
  .glitch { animation: none; }
  .glass-card, .btn-primary, .btn-ghost { transition: none; }
  .scanlines { display: none; }
}

/* ============================================================
   Responsive — tablet
   ============================================================ */
@media (max-width: 900px) {
  :root { --nav-w: 220px; }
  .sidebar-left { width: 190px; }
  .main-content { padding: 1.5rem 1.5rem 1.5rem 1rem; }
  .values-grid { grid-template-columns: 1fr 1fr; }
}

/* ============================================================
   Responsive — mobile (≤680px)
   ============================================================ */
@media (max-width: 680px) {
  :root { --nav-w: 0px; }

  .site-wrapper { flex-direction: column; }

  .nav-details {
    position: static;
    width: 100%;
    height: auto;
    flex-direction: column;
    border-right: none;
    border-bottom: 1px solid var(--c-border);
    overflow: visible;
  }
  .nav-toggle {
    cursor: pointer;
    padding: 0.9rem 1rem;
  }
  .nav-toggle-icon { display: inline; }

  .nav-menu {
    max-height: 0;
    overflow: hidden;
    padding: 0;
    transition: max-height 0.3s ease;
  }
  .nav-details[open] .nav-menu {
    max-height: 80vh;
    overflow-y: auto;
    padding-bottom: 1rem;
  }
  .nav-menu li a { min-height: 44px; padding: 0.7rem 1rem; }

  .content-area { margin-left: 0; }

  .hero-home {
    min-height: auto;
    padding: 2.5rem 1.25rem 5rem;
  }
  .hero-h1 { font-size: 1.8rem; }
  .hero-bg-text { font-size: 5rem; opacity: 0.5; }

  .inner-layout { flex-direction: column; }
  .sidebar-left {
    width: 100%;
    position: static;
    padding: 1rem 1rem 0;
  }
  .main-content { padding: 1.25rem 1rem; }

  .content-section { padding: 1.5rem 1rem; }
  .page-header-bar { padding: 1.75rem 1rem 1.5rem; }
  .feature-hero-bar { padding: 2rem 1rem 4rem; }
  .feature-hero-media { display: none; }

  .card-grid { grid-template-columns: 1fr; }
  .values-grid { grid-template-columns: 1fr; }

  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 0.75rem;
    padding: 1.25rem 1rem;
  }
  .footer-nav { justify-content: center; }

  .guide-pagination { flex-direction: column; }
  .guide-prev, .guide-next { min-width: 0; }

  .breadcrumb { padding: 0.65rem 1rem; }
}

/* ============================================================
   Utility
   ============================================================ */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}