/* index.html 专属样式（从页面内联 <style> 抽出，仅首页使用） */
html { scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif; }
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 0.7s cubic-bezier(0.16,1,0.3,1), transform 0.7s cubic-bezier(0.16,1,0.3,1); }
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }
.reveal-delay-5 { transition-delay: 0.40s; }
.card-shadow { box-shadow: 0 1px 3px rgba(0,0,0,0.04), 0 4px 16px -2px rgba(0,0,0,0.06); }
.card-shadow-hover:hover { box-shadow: 0 4px 24px -4px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.04); }
.highlight { color: #2563EB; font-weight: 600; }
.grid-pattern { background-image: linear-gradient(rgba(15,23,42,0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(15,23,42,0.035) 1px, transparent 1px); background-size: 44px 44px; mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 40%, transparent 100%); -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, black 40%, transparent 100%); }
.hero-glow { background: radial-gradient(closest-side, rgba(59,130,246,0.16), rgba(99,102,241,0.07), transparent); }
.kbd { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.75rem; background: #F1F5F9; border: 1px solid #E2E8F0; border-bottom-width: 2px; border-radius: 0.375rem; padding: 0.125rem 0.4rem; color: #334155; }
.faq-item { transition: border-color 0.2s; }
.faq-item[open] { border-color: #93C5FD; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-arrow { transition: transform 0.2s ease; }
.faq-item[open] .faq-arrow { transform: rotate(180deg); }
.nav-link { position: relative; }
.nav-link::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px; background: #3B82F6; transition: width 0.25s ease; border-radius: 1px; }
.nav-link:hover::after { width: 100%; }
.mock-bar { height: 6px; border-radius: 3px; }
.theme-fade { opacity: 0; transform: scale(1.012); transition: opacity 0.55s cubic-bezier(0.16,1,0.3,1), transform 0.55s cubic-bezier(0.16,1,0.3,1); pointer-events: none; }
.theme-fade.active { opacity: 1; transform: scale(1); }
.theme-btn { padding: 0.45rem 1.05rem; border-radius: 9999px; font-size: 0.85rem; font-weight: 600; color: #64748B; background: #fff; border: 1px solid #E2E8F0; transition: all 0.2s ease; cursor: pointer; }
.theme-btn:hover { border-color: #93C5FD; color: #2563EB; transform: translateY(-1px); }
.theme-btn[aria-selected="true"] { background: #2563EB; border-color: #2563EB; color: #fff; box-shadow: 0 4px 12px -2px rgba(37,99,235,0.35); }
@media (prefers-reduced-motion: reduce) { .theme-fade { transition: none; } }

/* Editing demo (req 080): F2 Live Edit simulation doc */
.edit-tab { cursor: pointer; width: 100%; font: inherit; display: flex; flex-direction: column; align-items: stretch; }
.edit-tab:focus-visible { outline: 2px solid #2563EB; outline-offset: 2px; }
/* 选中态强调跟随点击的卡片，而非固定在 Live Edit 上 */
.edit-tab[aria-selected="true"] { background-image: linear-gradient(to bottom, rgba(219,234,254,0.8), rgba(239,246,255,0.6), #fff); background-color: #fff; border-color: #BFDBFE; box-shadow: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1), 0 0 0 1px #3B82F6; }
.edit-tab[aria-selected="true"] h3 { color: #2563EB; }
.edit-tab[aria-selected="true"] p { color: #475569; }
.demo-doc { max-width: 46rem; margin: 0 auto; padding: 2.5rem 3rem; font-size: 0.9rem; line-height: 1.65; color: #1E293B; }
@media (max-width: 640px) { .demo-doc { padding: 1.5rem 1.25rem; font-size: 0.85rem; } }
.demo-doc h1 { font-size: 1.7em; font-weight: 800; margin: 0 0 0.7em; letter-spacing: -0.01em; }
.demo-doc h2 { font-size: 1.2em; font-weight: 700; margin: 1.4em 0 0.5em; }
.demo-doc blockquote { margin: 0 0 1em; padding: 0.35em 0.9em; border-left: 3px solid #93C5FD; background: #EFF6FF; border-radius: 0 0.375rem 0.375rem 0; color: #475569; }
.demo-doc table { border-collapse: collapse; margin: 0 auto; min-width: 80%; }
.demo-doc th, .demo-doc td { border: 1px solid #E2E8F0; padding: 0.4em 0.9em; text-align: left; }
.demo-doc th { background: #F8FAFC; font-weight: 600; color: #334155; }
.demo-doc td.ld-cell-edit { transition: background-color 0.2s; }
.demo-doc td.ld-cell-edit.demo-editing { background: #EFF6FF; }
.demo-caret { display: inline-block; width: 2px; height: 1.05em; background: #2563EB; vertical-align: text-bottom; margin-left: 1px; animation: demo-caret-blink 1s steps(1) infinite; }
@keyframes demo-caret-blink { 50% { opacity: 0; } }
@media (prefers-reduced-motion: reduce) { .demo-caret { animation: none; } }
/* editing-focus state: faint Markdown syntax marker, like the real Live Edit backdrop;
   heading text keeps its normal style — only the "# " itself is lighter */
.ld-hash { color: #94A3B8; font-weight: 600; margin-right: 0.1em; }