/* =========================================================================
   移动端 / 可达性 补丁  fix-2026-10.css
   1) ≤968px 主站导航此前被 display:none 且无替代 → 汉堡按钮 + 玻璃抽屉
   2) .reveal 无 JS 兜底 → 内容不再整页隐身
   3) 小字可读性（中文 <12px 提升）
   依赖：主站 token（--glass-* / --accent-*），子页面有 fallback
   ========================================================================= */

/* ---------- 1. 汉堡按钮 ---------- */
.nav-burger {
  display: none;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 12px;
  border: 1px solid var(--nav-border, rgba(255, 255, 255, 0.18));
  background: var(--glass-fill, rgba(20, 28, 40, 0.42));
  -webkit-backdrop-filter: blur(14px) saturate(1.6);
  backdrop-filter: blur(14px) saturate(1.6);
  cursor: pointer;
  flex: 0 0 auto;
  transition: border-color 0.3s ease, background 0.3s ease, transform 0.3s ease;
}
.nav-burger span {
  display: block;
  width: 17px;
  height: 1.6px;
  border-radius: 2px;
  background: var(--text-primary, #f0f0f5);
  transition: transform 0.32s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.2s ease;
}
.nav-burger:hover { border-color: var(--accent-bronze, #5a9e8f); }
.nav-burger[aria-expanded='true'] span:nth-child(1) { transform: translateY(5.6px) rotate(45deg); }
.nav-burger[aria-expanded='true'] span:nth-child(2) { opacity: 0; }
.nav-burger[aria-expanded='true'] span:nth-child(3) { transform: translateY(-5.6px) rotate(-45deg); }

/* ---------- 2. 抽屉 ---------- */
.nav-drawer {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  width: min(82vw, 330px);
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 18px calc(24px + env(safe-area-inset-bottom));
  background: var(--glass-fill-strong, rgba(14, 20, 30, 0.92));
  -webkit-backdrop-filter: blur(26px) saturate(1.9);
  backdrop-filter: blur(26px) saturate(1.9);
  border-left: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.1));
  box-shadow: -24px 0 60px rgba(0, 0, 0, 0.45);
  transform: translateX(105%);
  transition: transform 0.4s cubic-bezier(0.34, 1.1, 0.64, 1);
  overflow-y: auto;
  overscroll-behavior: contain;
  visibility: hidden;
}
body.nav-open .nav-drawer { transform: none; visibility: visible; }

.nav-drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 14px;
  margin-bottom: 6px;
  border-bottom: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.1));
  font-size: 13px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--text-muted, #6a6a78);
}
.nav-drawer-close {
  width: 34px; height: 34px;
  display: grid; place-items: center;
  border: 1px solid var(--border-subtle, rgba(255, 255, 255, 0.14));
  background: transparent;
  border-radius: 10px;
  color: var(--text-secondary, #9a9aa8);
  font-size: 15px; line-height: 1;
  cursor: pointer;
}
.nav-drawer-close:hover { color: var(--text-primary, #f0f0f5); border-color: var(--accent-bronze, #5a9e8f); }

.nav-drawer a {
  display: block;
  padding: 13px 12px;
  border-radius: 12px;
  font-size: 16px;
  color: var(--text-secondary, #9a9aa8);
  text-decoration: none;
  transition: background 0.25s ease, color 0.25s ease, padding-left 0.25s ease;
}
.nav-drawer a:hover,
.nav-drawer a:focus-visible {
  background: var(--glow-primary, rgba(90, 158, 143, 0.15));
  color: var(--text-primary, #f0f0f5);
  padding-left: 18px;
}
.nav-drawer a.nav-drawer-cta {
  margin-top: auto;
  text-align: center;
  border: 1px solid var(--border-accent, rgba(90, 158, 143, 0.3));
  color: var(--accent-bronze-light, #7ab8a8);
}

.nav-drawer-backdrop {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(4, 6, 12, 0.55);
  -webkit-backdrop-filter: blur(2px);
  backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.32s ease;
}
body.nav-open .nav-drawer-backdrop { opacity: 1; pointer-events: auto; }
body.nav-open { overflow: hidden; }

@media (max-width: 968px) {
  .nav-burger { display: inline-flex; }
  /* 语言/主题按钮保持可见，仅导航列表进抽屉 */
  .nav .nav-links { display: none !important; }
}
@media (min-width: 969px) {
  .nav-burger, .nav-drawer, .nav-drawer-backdrop { display: none !important; }
}

/* ---------- 3. reveal 无 JS 兜底 ---------- */
html:not(.js-reveal) .reveal {
  opacity: 1 !important;
  transform: none !important;
}
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1 !important; transform: none !important; transition: none !important; }
  .nav-drawer { transition: none; }
}

/* ---------- 4. 小字可读性 ---------- */
@media (max-width: 768px) {
  .hero-eyebrow { font-size: 12px !important; letter-spacing: 2px !important; }
  .hero-desc { font-size: 15px !important; line-height: 1.85 !important; }
  .hero-meta-item { font-size: 13px !important; }
  .beta-badge { font-size: 10px !important; }
  .dropdown-header, .dropdown-item, .dropdown-footer { font-size: 13px !important; }
}

/* ---------- 5. 移动端 hero 文字与粒子分层 ---------- */
@media (max-width: 768px) {
  .hero-desc, .hero-meta, .hero-eyebrow {
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.9), 0 0 14px rgba(0, 0, 0, 0.85), 0 0 28px rgba(0, 0, 0, 0.6);
  }
  body.day-mode .hero-desc, body.day-mode .hero-meta, body.day-mode .hero-eyebrow {
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.95), 0 0 12px rgba(255, 255, 255, 0.9);
  }
}

/* =========================================================================
   点云实时光照（配合 text-light 模块，2026-10-26 v2）
   语义：点云是光源，文字是被照亮的物体 —— 文字本身不发光。
   · --light 光照强度 0..1     · --lx/--ly 指向光源的单位向量
   受光侧：朝向点云的一侧亮一圈边缘光；背光侧：落一层柔和投影。
   ========================================================================= */
[data-lit] {
  --light: 0;
  --lx: 0;
  --ly: 0;
  color: color-mix(in srgb, #d8f0ff calc(var(--light) * 55%), currentColor) !important;
  text-shadow:
    calc(var(--lx) * 1.6px) calc(var(--ly) * 1.6px) 0.6px rgba(180, 232, 255, calc(var(--light) * .70)),
    calc(var(--lx) * -4px) calc(var(--ly) * -4px) 8px rgba(0, 0, 0, calc(var(--light) * .65));
  transition: color .14s linear;
}
body.day-mode [data-lit] {
  color: color-mix(in srgb, #12354f calc(var(--light) * 42%), currentColor) !important;
  text-shadow:
    calc(var(--lx) * 1.6px) calc(var(--ly) * 1.6px) 0.6px rgba(255, 255, 255, calc(var(--light) * .95)),
    calc(var(--lx) * -3px) calc(var(--ly) * -3px) 6px rgba(30, 40, 50, calc(var(--light) * .30));
}
@media (prefers-reduced-motion: reduce) {
  [data-lit] { transition: none !important; }
}

/* ---- 移动端导航防挤压（汉堡按钮曾被挤出视口 18px）---- */
@media (max-width: 768px) {
  .nav { padding: 8px 10px !important; gap: 4px !important; }
  .nav .beta-badge { display: none !important; }
  .nav .nav-logo-text { max-width: 84px !important; }
  .nav .lang-toggle { padding: 4px 7px !important; font-size: 11px !important; letter-spacing: 0 !important; }
  .nav .theme-toggle { width: 34px !important; height: 34px !important; }
  .nav .nav-burger { width: 36px; height: 36px; }
}
@media (max-width: 420px) {
  .nav .nav-logo-text { max-width: 64px !important; }
}