/* 设计令牌（landing_architecture_review §4）：深冷工业底色；颜色不单独承担语义，必须配文字与形状。 */
:root {
  color-scheme: dark;
  --base: #08090a;
  --surface: #0f1115;
  --elevated: #161920;
  --border: #1f242c;          /* 仅装饰分隔，不独自表达可点击或焦点 */
  --border-strong: #3a4250;   /* 可操作控件边界 */
  --text: #f0f3f6;
  --text-2: #a6afb9;
  --focus: #9dbaff;
  --accent: #c9b98a;          /* 少量用于品牌与段落索引，不表达风险或盈利 */
  --warning: #f4c06a;
  --danger: #ff8585;
  --affirmative: #8dcbb4;
  --hairline: 1px;
  --radius: 6px;
  --container: 1680px;
  --prose: 70ch;
  --gutter: 16px;
  --font-sans: system-ui, "Segoe UI", "Noto Sans", "PingFang SC", "Microsoft YaHei", "Noto Sans Arabic",
    "Segoe UI Arabic", "Geeza Pro", sans-serif;
  /* 等宽数值：只用本机已安装字体，不向第三方请求字体 */
  --font-mono: "JetBrains Mono", ui-monospace, "Cascadia Mono", "SF Mono", Consolas, "Liberation Mono", monospace;
}
@media (min-width: 768px) { :root { --gutter: 24px; } }
@media (min-width: 1280px) { :root { --gutter: 40px; } }

/* 全站基础样式：逻辑方向属性（RTL 自动镜像布局）、320px 起可读、尊重减少动态效果。 */
*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }   /* 组件的 display 样式不得覆盖 hidden 属性 */
html { background: var(--base); color: var(--text); font-family: var(--font-sans); font-size: 100%;
  line-height: 1.6; -webkit-text-size-adjust: 100%; }
body { margin: 0; min-inline-size: 0; overflow-wrap: break-word; }
a { color: var(--focus); text-underline-offset: 3px; }
a:hover { color: var(--text); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; border-radius: 2px; }
.mono, time, bdi.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.container { inline-size: 100%; max-inline-size: var(--container); margin-inline: auto; padding-inline: var(--gutter); }

.skip { position: absolute; inset-inline-start: var(--gutter); inset-block-start: -100px; padding: 8px 12px;
  background: var(--elevated); border: var(--hairline) solid var(--border-strong); z-index: 10; }
.skip:focus { inset-block-start: 8px; }

.site-header { border-block-end: var(--hairline) solid var(--border); background: var(--base); }
.site-header .container { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px; padding-block: 12px; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none;
  font-weight: 600; letter-spacing: 0.02em; }
.brand img { inline-size: 24px; block-size: 24px; }
.site-nav { display: flex; flex-wrap: wrap; gap: 4px 16px; margin-inline-start: auto; }
.site-nav a, .lang a { color: var(--text-2); text-decoration: none; font-size: 0.9375rem; padding-block: 6px; }
.site-nav a:hover, .lang a:hover, .site-nav a[aria-current="page"] { color: var(--text); }
.lang { display: flex; flex-wrap: wrap; gap: 4px 12px; padding-inline-start: 16px;
  border-inline-start: var(--hairline) solid var(--border); }
.lang a[aria-current="true"] { color: var(--text); text-decoration: underline; text-decoration-color: var(--accent); }

.draft-banner { border-block-end: var(--hairline) solid var(--warning); background: #1d1708; color: var(--warning); }
.draft-banner p { margin: 0; padding-block: 10px; font-size: 0.875rem; }
.pending { background: transparent; color: var(--warning); border: var(--hairline) dashed var(--warning);
  border-radius: 3px; padding-inline: 4px; }

main { display: block; }
.legal { padding-block: 40px 64px; }
.legal article { max-inline-size: var(--prose); }
.eyebrow { color: var(--accent); font-family: var(--font-mono); font-size: 0.8125rem; letter-spacing: 0.08em;
  text-transform: uppercase; margin: 0 0 8px; }
.legal h1 { font-size: clamp(1.75rem, 3vw, 2.5rem); line-height: 1.2; margin: 0 0 12px; }
.legal h2 { font-size: 1.25rem; margin: 40px 0 12px; padding-block-start: 16px;
  border-block-start: var(--hairline) solid var(--border); }
.legal p, .legal li { color: var(--text); }
.meta-line { color: var(--text-2); font-size: 0.875rem; margin: 0 0 24px; }
.summary { background: var(--surface); border: var(--hairline) solid var(--border); border-radius: var(--radius);
  padding: 16px 20px; margin-block: 24px; }
.summary h2 { margin-block-start: 0; padding: 0; border: 0; font-size: 1rem; color: var(--accent); }
.summary ul { margin: 0; padding-inline-start: 1.2em; }
.toc ol { margin: 0; padding-inline-start: 1.4em; columns: 2 16rem; }
.table-wrap { overflow-x: auto; border: var(--hairline) solid var(--border); border-radius: var(--radius); }
table { border-collapse: collapse; inline-size: 100%; font-size: 0.9375rem; }
caption { text-align: start; color: var(--text-2); padding: 10px 12px; caption-side: top; font-size: 0.875rem; }
th, td { text-align: start; vertical-align: top; padding: 10px 12px; border-block-start: var(--hairline) solid var(--border); }
th { color: var(--text-2); font-weight: 600; background: var(--surface); }
/* 窄屏：表格改为逐行卡片，正文不依赖横向滚动 */
@media (max-width: 720px) {
  .table-wrap { overflow: visible; border: 0; }
  table, thead, tbody, tr, th, td { display: block; }
  thead { position: absolute; inline-size: 1px; block-size: 1px; overflow: hidden; clip-path: inset(50%); }
  tr { border: var(--hairline) solid var(--border); border-radius: var(--radius); margin-block-end: 12px; background: var(--surface); }
  td { border: 0; padding-block: 6px; }
  td::before { content: attr(data-label); display: block; color: var(--text-2); font-size: 0.8125rem; }
}

.hero-min { padding-block: 64px; }
.hero-min h1 { font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.15; margin: 0 0 16px; max-inline-size: 22ch; }
.hero-min p { color: var(--text-2); font-size: 1.0625rem; max-inline-size: 60ch; }
.badge { display: inline-flex; align-items: center; gap: 8px; border: var(--hairline) solid var(--border-strong);
  border-radius: 999px; padding: 4px 12px; font-size: 0.875rem; color: var(--text-2); }
.badge::before { content: ""; inline-size: 8px; block-size: 8px; border-radius: 50%; background: var(--warning); }

.site-footer { border-block-start: var(--hairline) solid var(--border); padding-block: 32px; color: var(--text-2);
  font-size: 0.875rem; }
.site-footer nav { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-block-end: 12px; }
.site-footer p { max-inline-size: var(--prose); margin: 0 0 8px; }

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important;
  scroll-behavior: auto !important; } }

/* 阶段 2：全局 HUD 导航与首屏产品实景框（landing_blueprint_v2 §2、§3）。 */

/* ---------------------------------------------------------------- HUD 导航 */
.hud { position: sticky; inset-block-start: 0; z-index: 5; background: color-mix(in srgb, var(--base) 92%, transparent);
  border-block-end: var(--hairline) solid var(--border); backdrop-filter: blur(6px); }
.hud .container { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 20px; min-block-size: 56px; padding-block: 8px; }
.hud .brand { flex: none; }
.hud-status { display: inline-flex; align-items: center; gap: 8px; min-inline-size: 0; padding: 4px 10px;
  border: var(--hairline) solid var(--border); border-radius: 999px; color: var(--text-2); font-size: 0.8125rem; }
.hud-status .dot { flex: none; inline-size: 8px; block-size: 8px; border-radius: 50%; background: var(--warning);
  box-shadow: 0 0 0 0 color-mix(in srgb, var(--warning) 60%, transparent); animation: breathe 2.4s ease-in-out infinite; }
.hud-status[data-state="STORE_AVAILABLE"] .dot { background: var(--affirmative); }
.hud-status .ver { font-family: var(--font-mono); color: var(--text-2); padding-inline-start: 8px;
  border-inline-start: var(--hairline) solid var(--border); }
@keyframes breathe { 0%, 100% { opacity: 1; box-shadow: 0 0 0 0 color-mix(in srgb, var(--warning) 55%, transparent); }
  50% { opacity: 0.45; box-shadow: 0 0 0 5px color-mix(in srgb, var(--warning) 0%, transparent); } }

.hud-links { display: flex; align-items: center; gap: 8px 18px; margin-inline-start: auto; }
.hud-links .site-nav, .hud-links .lang { margin: 0; }
.btn { display: inline-flex; align-items: center; justify-content: center; min-block-size: 40px; padding: 8px 16px;
  border-radius: var(--radius); border: var(--hairline) solid var(--border-strong); color: var(--text);
  text-decoration: none; font-weight: 600; font-size: 0.9375rem; text-align: center; }
.btn:hover { border-color: var(--text-2); color: var(--text); }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #111; }
.btn-primary:hover { background: #d9cb9f; color: #111; }

/* 窄屏：原生 <details> 折叠菜单，不依赖 JavaScript */
.hud-menu { display: none; margin-inline-start: auto; }
.hud-menu > summary { list-style: none; cursor: pointer; min-block-size: 40px; padding: 8px 12px; border-radius: var(--radius);
  border: var(--hairline) solid var(--border-strong); color: var(--text); font-size: 0.9375rem; }
.hud-menu > summary::-webkit-details-marker { display: none; }
.hud-menu[open] > summary { border-color: var(--focus); }
.hud-menu .menu-panel { position: absolute; inset-inline: var(--gutter); margin-block-start: 8px; padding: 16px;
  display: grid; gap: 14px; background: var(--surface); border: var(--hairline) solid var(--border-strong); border-radius: var(--radius); }
.hud-menu .menu-panel .site-nav, .hud-menu .menu-panel .lang { margin: 0; padding: 0; border: 0; }
/* 1024–1599px：导航项较多，状态只留呼吸灯与版本（完整状态在首屏发布说明中），保证页头单行 */
@media (max-width: 1599px) { .hud-status .txt { display: none; } }
@media (max-width: 1023px) {
  .hud-links { display: none; }
  .hud-menu { display: block; }
  .hud-status .txt { display: none; }       /* 窄屏只留呼吸灯与版本；完整状态在首屏文案下方 */
}
@media (max-width: 479px) {
  .hud .container { gap: 8px 10px; flex-wrap: nowrap; }
  .hud .brand { gap: 8px; min-inline-size: 0; }
  .hud .brand img { inline-size: 20px; block-size: 20px; }
  .hud .brand span { font-size: 0.875rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .hud-menu > summary { padding: 8px 10px; }
  .draft-banner p { font-size: 0.75rem; line-height: 1.45; padding-block: 6px; }
  .hud-status { padding: 4px 8px; }
  .hud-status .ver { display: none; }       /* 最窄屏：只保留呼吸灯（有 aria-label 与首屏的发布说明） */
}

/* ---------------------------------------------------------------- 首屏 */
.hero { --above: 384px; padding-block: 20px 28px; }
.hero-copy { display: grid; gap: 10px 32px; align-items: end; margin-block-end: 18px; }
@media (min-width: 1024px) { .hero-copy { grid-template-columns: minmax(0, 1fr) auto; } }
.hero h1 { font-size: clamp(1.625rem, 3vw, 2.75rem); line-height: 1.15; letter-spacing: -0.01em; margin: 0; max-inline-size: 30ch;
  text-wrap: balance; }
.hero .lede { color: var(--text-2); font-size: 1.0625rem; margin: 6px 0 0; max-inline-size: 62ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.release-note { margin: 8px 0 0; color: var(--text-2); font-size: 0.875rem; display: flex; align-items: center; gap: 8px; }
.release-note::before { content: ""; inline-size: 8px; block-size: 8px; border-radius: 2px; background: var(--warning); flex: none; }
@media (max-width: 767px) {
  .hero { padding-block: 10px 24px; }
  .hero-copy { margin-block-end: 10px; gap: 6px; }
  .hero h1 { font-size: 1.5rem; line-height: 1.12; }
  .hero .lede { font-size: 0.9375rem; line-height: 1.45; margin-block-start: 4px; }
  .release-note { margin-block-start: 4px; font-size: 0.8125rem; }
  .hero-actions .btn { flex: 1 1 auto; min-block-size: 44px; }
  /* 手机：次要行动改为文字链接，把首屏高度留给产品实景（触控高度仍 ≥ 44px） */
  .hero-actions .btn:not(.btn-primary) { flex: 0 1 auto; border-color: transparent; padding-inline: 0; font-weight: 500;
    color: var(--focus); text-decoration: underline; text-underline-offset: 3px; }
}

/* ---------------------------------------------------------------- 产品实景框（ProductSceneFrame）
   整体按素材原始比例（采集目标 16:9）等比缩放，宽度受“视口高度 − 首屏文案”约束，保证不滚动即完整可见。
   框内一律 dir=ltr：它代表一张实拍截图，阿拉伯语页面也不镜像，TradingView 在左、侧边栏在右。 */
.scene { margin: 0 auto; inline-size: min(100%, calc((100svh - var(--above)) * 16 / 9)); }
.scene-window { position: relative; container-type: inline-size; aspect-ratio: 16 / 9; display: grid;
  grid-template-rows: auto minmax(0, 1fr); overflow: hidden; background: #0b0d10;
  border: var(--hairline) solid var(--border-strong); border-radius: 8px; box-shadow: 0 0 0 1px #000, 0 24px 60px rgba(0, 0, 0, 0.55); }
.win-bar { display: flex; align-items: center; gap: 1.2cqw; padding: 0.7cqw 1.2cqw; background: #14171c;
  border-block-end: 1px solid var(--border); font-size: max(7px, 0.85cqw); color: var(--text-2); white-space: nowrap; }
.win-dots { display: inline-flex; gap: 0.45cqw; }
.win-dots i { inline-size: 0.75cqw; block-size: 0.75cqw; min-inline-size: 4px; min-block-size: 4px; border-radius: 50%; background: #2a2f37; }
.win-tab { padding: 0.25cqw 1cqw; border: 1px solid var(--border); border-block-end: 0; border-radius: 0.4cqw 0.4cqw 0 0; color: var(--text); }
.win-url { flex: 1 1 auto; min-inline-size: 0; overflow: hidden; text-overflow: ellipsis; padding: 0.25cqw 1cqw;
  border-radius: 999px; background: #0d0f13; font-family: var(--font-mono); }
.win-ext { display: inline-flex; }
.win-ext img { inline-size: 1.4cqw; block-size: 1.4cqw; min-inline-size: 8px; min-block-size: 8px; }
.win-body { display: grid; grid-template-columns: 7fr 3fr; min-block-size: 0; }   /* 7:3 宿主与侧边栏 */

.tv-region { position: relative; min-inline-size: 0; border-inline-end: 1px solid var(--border-strong);
  background:
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.018) 0 1cqw, transparent 1cqw 2cqw),
    linear-gradient(to right, rgba(255, 255, 255, 0.045) 1px, transparent 1px) 0 0 / 7cqw 100%,
    linear-gradient(to bottom, rgba(255, 255, 255, 0.045) 1px, transparent 1px) 0 0 / 100% 5cqw,
    #0c0e12; }
.tv-toolbar { position: absolute; inset-block: 0; inset-inline-start: 0; inline-size: 3cqw; border-inline-end: 1px solid var(--border);
  background: #101318; }
.tv-axis-y { position: absolute; inset-block: 0 3cqw; inset-inline-end: 0; inline-size: 5cqw; border-inline-start: 1px solid var(--border);
  background: #101318; }
.tv-axis-x { position: absolute; inset-inline: 3cqw 0; inset-block-end: 0; block-size: 3cqw; border-block-start: 1px solid var(--border);
  background: #101318; }
.region-label { position: absolute; inset-inline: 12% 14%; inset-block-start: 38%; padding: 1.4cqw 1.8cqw; display: grid; gap: 0.5cqw;
  background: rgba(15, 17, 21, 0.9); border: 1px dashed var(--warning); border-radius: 0.6cqw; }
.region-label strong { font-size: max(8px, 1.5cqw); color: var(--text); font-weight: 600; }
.region-label span { font-size: max(7px, 1.05cqw); color: var(--text-2); line-height: 1.45; }

.panel-region { min-inline-size: 0; display: grid; grid-template-rows: auto; align-content: start; gap: 0.9cqw;
  padding: 1.2cqw; background: #0f1115; overflow: hidden; }
.panel-head { display: flex; align-items: center; gap: 0.7cqw; font-size: max(8px, 1.15cqw); font-weight: 600; color: var(--text);
  padding-block-end: 0.8cqw; border-block-end: 1px solid var(--border); }
.panel-head img { inline-size: 1.6cqw; block-size: 1.6cqw; min-inline-size: 9px; min-block-size: 9px; }
.panel-item { padding: 0.8cqw 1cqw; border: 1px solid var(--border); border-radius: 0.5cqw; background: #13161b; display: grid; gap: 0.55cqw; }
.panel-item b { font-size: max(7px, 0.95cqw); font-weight: 600; color: var(--text); }
.panel-item i { display: block; block-size: 0.55cqw; min-block-size: 3px; border-radius: 2px; background: #232830; }
.panel-item i + i { inline-size: 70%; }
.panel-item.alert { border-color: color-mix(in srgb, var(--danger) 55%, var(--border)); background: #1a1113; }
.panel-pending { font-size: max(7px, 0.9cqw); color: var(--warning); }

.placeholder-badge { position: absolute; inset-block-start: 1.2cqw; inset-inline-start: 4.2cqw; z-index: 1; padding: 0.35cqw 0.9cqw;
  font: 600 max(7px, 0.9cqw) / 1.3 var(--font-mono); letter-spacing: 0.04em; color: #1b1506; background: var(--warning); border-radius: 0.35cqw; }

.scene figcaption { margin-block-start: 10px; display: grid; gap: 2px; color: var(--text-2); font-size: 0.8125rem; }

/* 窄屏：全景缩略图之后给出侧边栏细节（占位），保证文字可读 */
.scene-detail { display: none; margin-block-start: 16px; padding: 16px; border: var(--hairline) solid var(--border-strong);
  border-radius: var(--radius); background: var(--surface); }
.scene-detail h2 { font-size: 1rem; margin: 0 0 10px; }
.scene-detail ul { margin: 0 0 10px; padding-inline-start: 1.2em; }
.scene-detail .panel-pending { font-size: 0.875rem; }
@media (max-width: 767px) { .scene-detail { display: block; } }

@media (prefers-reduced-motion: reduce) { .hud-status .dot { animation: none; } }

/* 短高视口（横屏手机、200%/400% 缩放）：页头不吸顶，避免遮住正文与操作（landing review §10.2） */
@media (max-height: 480px) { .hud { position: static; } }

/* 阶段 3：工作方式讲解区（StoryDeck：叙事栏 | 32px 轨道 / 6px 可见线 | 媒体舞台）与独立虚拟沙盘（PaperDemo）。
   无 JavaScript 或窄屏：单列，章节后紧跟各自的媒体；分屏只在脚本确认几何可行后启用。 */

:root { --sticky-top: 88px; }   /* 吸顶页头约 73px + 留白 */
.sr-only { position: absolute; inline-size: 1px; block-size: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.story, .paper { padding-block: 64px; border-block-start: var(--hairline) solid var(--border); }
.story-head, .paper-head { max-inline-size: 70ch; margin-block-end: 28px; }
.story-head h2, .paper-head h2 { font-size: clamp(1.5rem, 2.4vw, 2.25rem); line-height: 1.2; margin: 0 0 10px; text-wrap: balance; }
.story-head p, .paper-head p { color: var(--text-2); margin: 0; }

/* ---------------------------------------------------------------- 叙事栏 */
.story-steps ol { list-style: none; margin: 0 0 8px; padding: 0; display: flex; flex-wrap: wrap; gap: 8px; }
.story-steps a { display: inline-flex; align-items: center; gap: 8px; min-block-size: 44px; padding: 6px 12px;
  border: var(--hairline) solid var(--border-strong); border-radius: var(--radius); color: var(--text-2); text-decoration: none; }
.story-steps a:hover { color: var(--text); border-color: var(--text-2); }
.story-steps a[aria-current="step"] { color: var(--text); border-color: var(--accent); background: var(--elevated); }
.story-steps .idx, .chapter-index { font-family: var(--font-mono); color: var(--accent); letter-spacing: 0.06em; }

.chapter { padding-block: 28px; border-block-start: var(--hairline) solid var(--border); }
.chapter h3 { font-size: 1.375rem; margin: 4px 0 10px; }
.chapter p { max-inline-size: 62ch; margin: 0 0 10px; }
.chapter-index { margin: 0; font-size: 0.875rem; }
.chapter .boundary { color: var(--text-2); font-size: 0.9375rem; padding-inline-start: 12px;
  border-inline-start: 2px solid var(--warning); }
.chapter.is-active h3 { color: var(--accent); }

.chapter-media { margin: 16px 0 0; }
.media-frame { position: relative; border: var(--hairline) solid var(--border-strong); border-radius: 8px; overflow: hidden; background: #0f1115; }
.media-frame img { display: block; inline-size: 100%; block-size: auto; }
.media-badge { position: absolute; inset-block-start: 10px; inset-inline-start: 10px; max-inline-size: calc(100% - 20px);
  padding: 3px 8px; border-radius: 4px; background: var(--warning); color: #1b1506; font: 600 0.75rem / 1.35 var(--font-mono); }
.chapter-media figcaption { margin-block-start: 10px; color: var(--text-2); font-size: 0.875rem; }
.media-title { display: block; color: var(--text); font-weight: 600; margin-block-end: 4px; }
.media-items { margin: 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: 6px; }
.media-items li { padding: 2px 8px; border: var(--hairline) solid var(--border); border-radius: 999px; }

/* ---------------------------------------------------------------- 分屏 */
.story-deck.is-split { display: grid; grid-template-columns: var(--narrative, 40%) 32px minmax(0, 1fr); align-items: start; }
.story-deck.is-animating { transition: grid-template-columns 0.24s ease; }
.story-deck.is-dragging { user-select: none; cursor: col-resize; }
.story-deck.is-split .chapter-media { display: none; }
.story-deck.is-split .chapter { min-block-size: 62svh; }
.story-deck.is-split .story-steps { position: sticky; inset-block-start: var(--sticky-top); z-index: 2; background: var(--base); padding-block: 8px; }

.splitter-track { align-self: stretch; position: relative; }
.splitter { position: sticky; inset-block-start: var(--sticky-top); block-size: calc(100svh - var(--sticky-top) - 16px); inline-size: 32px;
  display: flex; justify-content: center; cursor: col-resize; touch-action: none; outline: none; }
.splitter .grip { inline-size: 6px; block-size: 100%; border-radius: 3px; background: var(--border-strong);
  transition: background-color 0.15s ease; }
.splitter:hover .grip, .is-dragging .splitter .grip { background: var(--accent); }
.splitter:focus-visible .grip { background: var(--focus); box-shadow: 0 0 0 2px var(--base), 0 0 0 4px var(--focus); }

.story-stage { position: sticky; inset-block-start: var(--sticky-top); display: grid; gap: 10px; min-inline-size: 0; }
.story-stage[aria-busy="true"] .stage-body { opacity: 0.85; }
.stage-toolbar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px; }
.stage-controls { display: inline-flex; gap: 6px; margin-inline-start: auto; }
.btn-quiet { min-block-size: 36px; padding: 6px 12px; font-weight: 500; font-size: 0.875rem; color: var(--text-2); }
.btn-icon { min-block-size: 36px; inline-size: 36px; padding: 0; }
/* 物理边框：箭头方向只由旋转角决定，不受 RTL 下逻辑边框换边影响 */
.chev { inline-size: 8px; block-size: 8px; border-top: 2px solid currentColor; border-left: 2px solid currentColor; }
.chev-narrow { transform: rotate(-45deg); }            /* 逻辑方向：指向 inline-start */
.chev-wide { transform: rotate(135deg); }
[dir="rtl"] .chev-narrow { transform: rotate(135deg); }   /* RTL：叙事栏在右，收窄即分隔线向右 */
[dir="rtl"] .chev-wide { transform: rotate(-45deg); }
.stage-body { display: grid; gap: 10px; }
.media-fallback { aspect-ratio: 16 / 10; display: grid; place-items: center; padding: 48px 24px 24px; text-align: center;
  color: var(--text-2); font-size: 0.9375rem; background: repeating-linear-gradient(135deg, #111418 0 10px, #0f1115 10px 20px); }
.stage-body .media-frame img, .stage-body img { display: block; inline-size: 100%; block-size: auto; }
.stage-body figcaption { color: var(--text-2); font-size: 0.875rem; }
.stage-body .media-frame { max-block-size: calc(100svh - 220px); }

/* ---------------------------------------------------------------- 独立虚拟沙盘 */
.paper { background: linear-gradient(to bottom, #0b0c0e, var(--base)); }
.paper-badge { display: inline-block; margin: 0 0 12px; padding: 6px 12px; border: 2px solid var(--warning); border-radius: 4px;
  color: var(--warning); font: 700 0.9375rem / 1.3 var(--font-mono); letter-spacing: 0.06em; }
.demo-note { margin-block-start: 10px !important; font-size: 0.875rem; }
.paper-cash { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 16px; margin: 0 0 24px; padding: 14px 18px;
  border: var(--hairline) solid var(--border); border-radius: var(--radius); background: var(--surface); }
.paper-cash dt { color: var(--text-2); font-size: 0.875rem; }
.paper-cash dd { margin: 0; font-size: 1.5rem; font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.paper-grid { display: grid; gap: 16px; }
@media (min-width: 960px) { .paper-grid { grid-template-columns: 1.4fr 1fr 1fr; } }
.paper-card { padding: 18px; border: var(--hairline) solid var(--border); border-radius: var(--radius); background: var(--surface); min-inline-size: 0; }
.paper-card h3 { font-size: 1.0625rem; margin: 0 0 10px; }
.paper-card p { margin: 0 0 12px; color: var(--text-2); }
.mode-picker { display: flex; flex-wrap: wrap; gap: 8px; margin-block-end: 12px; }
.mode-btn { display: grid; gap: 2px; min-block-size: 44px; padding: 6px 12px; border: var(--hairline) solid var(--border-strong);
  border-radius: var(--radius); background: transparent; color: var(--text-2); font: inherit; font-size: 0.875rem; cursor: pointer; text-align: start; }
.mode-btn .mono { font-size: 0.75rem; letter-spacing: 0.05em; }
.mode-btn[aria-pressed="true"] { border-color: var(--accent); color: var(--text); background: var(--elevated); }
.mode-panel h4 { margin: 0 0 6px; font-size: 1rem; }
.mode-panel + .mode-panel { margin-block-start: 12px; }
.btn-danger { border-color: var(--danger); color: var(--danger); background: transparent; }
.btn-danger:hover { background: color-mix(in srgb, var(--danger) 12%, transparent); color: var(--text); }
.stop-state { padding: 10px 12px; border: var(--hairline) solid var(--danger); border-radius: var(--radius); color: var(--text) !important; }
.stop-state::before { content: ""; display: inline-block; inline-size: 10px; block-size: 10px; margin-inline-end: 8px; background: var(--danger); }
button { font-family: inherit; }
button.btn:not(.btn-primary) { background: transparent; }
button.btn { cursor: pointer; }

@media (prefers-reduced-motion: reduce) { .story-deck.is-animating { transition: none; } }