/* ==========================================================================
   APHA Guide — 功能教程子站样式 (纯静态, 自包含)
   Version: 20261103g  (bump on every change!)
   v20261103g 小程序内链接适配 toast(.gd-toast 底部胶囊): 外域链接点击改为复制链接提示
   v20261103f 演示幻灯 overflow hidden —— fitSlide 缩放后布局宽>视觉宽会产生假横向滚动条, 内容视觉均在视口内可安全隐藏
   v20261103e 修复演示态"左右留白过多": 幻灯 padding 6vw→3vw / inner 上限 1080→1560 /
   解除演示态内层 .gd-wrap/.gd-hero-inner 1180 封顶 —— 基底铺满宽屏;
   配合 guide.js v20261103c fitSlide 宽度补偿(缩放后视觉宽度仍≈铺满)
   v20261103d 修复演示模式示意图不可见: 演示态要点/示意图纵排会把示意图压出首屏 ——
   ≥1000px 恢复滚动模式同款行布局(同屏并见), 仅 ≤999px 纵排; 配合 guide.js v20261103b fitSlide 整页缩放
   v20261103c 修复演示模式层级遮挡: 暗底移至 body / .gd-stage 遮罩透明化 /
   --alt 章节演示态去底 / 入场动效演示态强制显示 / 幻灯片安全居中(短内容居中,超高可滚动)
   设计语言: 延续官网基因 (主蓝 #2A7AE5 系 + Georgia 衬线标题 + 亮金点缀),
   组件前缀 gd-*; 无外部依赖, 无网络字体; 响应式 390–1440; reduced-motion 降级。
   方案: docs/Guide_Feature_Tutorial_Plan_20261103.html
   ========================================================================== */

:root {
    --gd-primary: #2A7AE5;
    --gd-primary-dark: #2169D3;
    --gd-deep: #1A4FA8;
    --gd-ink: #1F2937;
    --gd-body: #4B5563;
    --gd-muted: #6B7280;
    --gd-line: #E5E7EB;
    --gd-line-soft: #EEF1F5;
    --gd-bg: #F6F8FB;
    --gd-bg-soft: #EFF4FB;
    --gd-gold: #C9A227;
    --gd-green: #5B8F22;
    --gd-font-display: Georgia, "Times New Roman", "Songti SC", serif;
    --gd-font-body: "Segoe UI", "Helvetica Neue", Helvetica, Arial, "Microsoft YaHei", sans-serif;
    --gd-radius: 14px;
    --gd-ease: cubic-bezier(.22, .61, .36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { font-family: var(--gd-font-body); color: var(--gd-ink); background: #fff; line-height: 1.75; -webkit-font-smoothing: antialiased; }
img { max-width: 100%; }
a { color: var(--gd-primary); text-decoration: none; }
.gd-wrap { max-width: 1180px; margin: 0 auto; padding: 0 22px; }
body.gd-presenting { overflow: hidden; height: 100vh; background: linear-gradient(120deg, #123C7E 0%, var(--gd-deep) 40%, #2169D3 100%); }
body.gd-presenting > :not(.gd-stage) { display: none; }

/* ---------------- 按钮 ---------------- */
.gd-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    min-height: 42px; padding: 0 20px; border-radius: 999px; border: 1.5px solid transparent;
    font-size: 14px; font-weight: 600; font-family: inherit; cursor: pointer;
    transition: background-color .2s var(--gd-ease), color .2s, border-color .2s, box-shadow .2s;
}
.gd-btn--primary { color: #fff; background: linear-gradient(135deg, var(--gd-primary-dark), var(--gd-primary)); box-shadow: 0 6px 16px rgba(42,122,229,.28); }
.gd-btn--primary:hover { box-shadow: 0 8px 22px rgba(42,122,229,.4); }
.gd-btn--ghost { color: #fff; background: rgba(255,255,255,.12); border-color: rgba(255,255,255,.4); }
.gd-btn--ghost:hover { background: rgba(255,255,255,.22); }
.gd-btn--outline { color: var(--gd-primary-dark); background: #fff; border-color: #C9DBF2; }
.gd-btn--outline:hover { border-color: var(--gd-primary); background: #F3F8FF; }
.gd-btn--light { color: var(--gd-deep); background: #fff; }
.gd-btn--light:hover { background: #EAF1FB; }
.gd-btn--lg { min-height: 50px; padding: 0 28px; font-size: 15.5px; }
.gd-btn:focus-visible { outline: 3px solid rgba(42,122,229,.45); outline-offset: 2px; }

/* ---------------- 顶栏 ---------------- */
.gd-top { position: sticky; top: 0; z-index: 100; background: rgba(15,40,80,.97); backdrop-filter: blur(10px); }
.gd-top-inner { max-width: 1280px; margin: 0 auto; padding: 10px 22px; display: flex; align-items: center; gap: 18px; }
.gd-brand { display: flex; align-items: center; gap: 10px; margin-right: auto; }
.gd-brand-mark { font-family: var(--gd-font-display); font-size: 20px; font-weight: 700; letter-spacing: .06em; color: #fff; border: 1.5px solid rgba(255,255,255,.5); border-radius: 8px; padding: 2px 10px; }
.gd-brand-txt b { display: block; font-size: 15px; color: #fff; line-height: 1.2; }
.gd-brand-txt i { display: block; font-style: normal; font-size: 11px; color: rgba(255,255,255,.62); letter-spacing: .08em; }
.gd-topnav { display: flex; gap: 4px; }
.gd-topnav a { color: rgba(255,255,255,.85); font-size: 13.5px; padding: 8px 13px; border-radius: 999px; white-space: nowrap; transition: background-color .2s, color .2s; }
.gd-topnav a:hover { background: rgba(255,255,255,.12); color: #fff; }
.gd-topnav a.on { background: var(--gd-primary); color: #fff; font-weight: 600; }
.gd-top-ops { display: flex; gap: 10px; }

/* ---------------- HERO ---------------- */
.gd-hero { position: relative; overflow: hidden; background: linear-gradient(120deg, #123C7E 0%, var(--gd-deep) 30%, #2169D3 74%, #2A7AE5 100%); color: #fff; }
.gd-hero::before { content: ""; position: absolute; right: -140px; top: -160px; width: 460px; height: 460px; border-radius: 50%; background: radial-gradient(circle, rgba(255,255,255,.16) 0%, rgba(255,255,255,0) 64%); }
.gd-hero::after { content: ""; position: absolute; left: -80px; bottom: -180px; width: 340px; height: 340px; border-radius: 50%; border: 1px solid rgba(255,255,255,.14); }
.gd-hero-inner { position: relative; z-index: 1; max-width: 1180px; margin: 0 auto; padding: 76px 22px 66px; display: flex; gap: 44px; align-items: flex-start; }
.gd-hero-main { flex: 1; min-width: 0; }
.gd-eyebrow { display: inline-flex; align-items: center; gap: 8px; font-size: 12.5px; letter-spacing: .16em; text-transform: uppercase; color: #C7DFFF; font-weight: 700; }
.gd-eyebrow::before { content: ""; width: 26px; height: 2.5px; background: #FFD166; border-radius: 2px; }
.gd-hero h1 { font-family: var(--gd-font-display); font-size: 46px; line-height: 1.22; margin: 16px 0 18px; font-weight: 700; }
.gd-hero h1 em { font-style: normal; color: #FFD166; }
.gd-hero-sub { font-size: 16.5px; line-height: 1.9; color: rgba(255,255,255,.9); max-width: 720px; }
.gd-hero-sub b { color: #fff; }
.gd-hero-badges { display: flex; flex-wrap: wrap; gap: 8px; margin: 22px 0 26px; }
.gd-badge { font-size: 12.5px; color: rgba(255,255,255,.92); background: rgba(255,255,255,.13); border: 1px solid rgba(255,255,255,.26); border-radius: 999px; padding: 5px 14px; }
.gd-hero-cta { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.gd-hero-tip { margin-top: 14px; font-size: 12.5px; color: rgba(255,255,255,.6); }

/* 小程序二维码卡 */
.gd-hero-side { flex: none; width: 240px; }
.gd-qr-card { background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.24); border-radius: 18px; padding: 22px 20px; text-align: center; backdrop-filter: blur(4px); }
.gd-qr-card img { display: block; margin: 0 auto 12px; width: 150px; height: 150px; border-radius: 10px; background: #fff; padding: 6px; }
.gd-qr-card b { display: block; font-size: 14.5px; color: #fff; margin-bottom: 6px; }
.gd-qr-card span { display: block; font-size: 12.5px; color: rgba(255,255,255,.78); line-height: 1.6; }
.gd-qr-card i { display: block; font-style: normal; margin-top: 10px; padding-top: 10px; border-top: 1px dashed rgba(255,255,255,.25); font-size: 12px; color: #FFD166; letter-spacing: .04em; }

/* ---------------- 章节通用 ---------------- */
.gd-chapter { padding: 78px 0 64px; scroll-margin-top: 76px; }
.gd-chapter--alt { background: var(--gd-bg); }
.gd-ch-head { display: flex; gap: 20px; align-items: flex-start; margin-bottom: 34px; }
.gd-ch-no { flex: none; font-family: var(--gd-font-display); font-size: 54px; font-weight: 700; line-height: 1; color: transparent; -webkit-text-stroke: 1.6px rgba(42,122,229,.5); }
.gd-ch-head h2 { font-family: var(--gd-font-display); font-size: 32px; color: var(--gd-ink); margin-bottom: 8px; }
.gd-ch-lead { font-size: 15.5px; color: var(--gd-body); max-width: 860px; }
.gd-ch-body { display: flex; gap: 40px; align-items: stretch; }
.gd-points { flex: 1.15; min-width: 0; }
.gd-points h3 { font-size: 13px; letter-spacing: .14em; color: var(--gd-muted); text-transform: uppercase; margin-bottom: 14px; }
.gd-points ul { list-style: none; }
.gd-points li { position: relative; padding: 10px 0 10px 26px; border-bottom: 1px dashed var(--gd-line-soft); font-size: 14.5px; color: var(--gd-body); line-height: 1.85; }
.gd-points li::before { content: ""; position: absolute; left: 4px; top: 21px; width: 9px; height: 9px; border-radius: 50%; background: var(--gd-primary); box-shadow: 0 0 0 3px rgba(42,122,229,.15); }
.gd-points li b { color: var(--gd-ink); }
.gd-entry { margin-top: 22px; background: var(--gd-bg-soft); border: 1px solid var(--gd-line-soft); border-radius: var(--gd-radius); padding: 16px 18px; }
.gd-entry > span { display: block; font-size: 12px; letter-spacing: .14em; color: var(--gd-muted); margin-bottom: 10px; }
.gd-entry > div { display: flex; flex-wrap: wrap; gap: 10px; }

/* ---------------- 示意图: 手机框 ---------------- */
.gd-shot { flex: 1; min-width: 0; margin: 0; }
.gd-shot figcaption { font-size: 12px; letter-spacing: .1em; color: var(--gd-muted); text-align: center; margin-bottom: 12px; }
.gd-phone {
    position: relative; width: min(300px, 100%); margin: 0 auto;
    background: linear-gradient(160deg, #123C7E 0%, #1A4FA8 42%, #2A7AE5 100%);
    border-radius: 30px; padding: 34px 16px 20px; color: #fff;
    box-shadow: 0 24px 48px rgba(15,40,80,.35);
}
.gd-phone-notch { position: absolute; top: 12px; left: 50%; transform: translateX(-50%); width: 108px; height: 18px; background: rgba(0,0,0,.28); border-radius: 999px; }
.gd-shot-hero { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.gd-shot-avatar { flex: none; width: 52px; height: 52px; border-radius: 50%; background: rgba(255,255,255,.95); color: #1A4FA8; font-size: 24px; font-weight: 700; display: flex; align-items: center; justify-content: center; border: 3px solid rgba(255,255,255,.6); }
.gd-shot-hero b { display: block; font-size: 17px; }
.gd-shot-hero i { display: block; font-style: normal; font-size: 12px; color: rgba(255,255,255,.82); }
.gd-chipchip { display: inline-block; font-size: 10.5px; background: rgba(255,255,255,.16); border-radius: 999px; padding: 2px 9px; margin-top: 4px; }
.gd-shot-stats { display: flex; gap: 6px; margin-bottom: 12px; }
.gd-shot-stats span { flex: 1; text-align: center; background: rgba(255,255,255,.13); border: 1px solid rgba(255,255,255,.2); border-radius: 10px; padding: 6px 2px; font-size: 10.5px; color: rgba(255,255,255,.8); }
.gd-shot-stats b { display: block; font-size: 16px; color: #fff; }
.gd-shot-card { background: #fff; color: var(--gd-ink); border-radius: 10px; padding: 10px 12px; font-size: 12.5px; font-weight: 600; margin-bottom: 8px; position: relative; line-height: 1.5; }
.gd-tag { display: inline-block; font-size: 10.5px; font-weight: 700; color: var(--gd-primary-dark); background: #EAF1FB; border-radius: 999px; padding: 1px 8px; margin-right: 6px; }
.gd-shot-date { display: block; font-weight: 400; font-size: 11px; color: var(--gd-muted); margin-top: 3px; }
.gd-shot-poster { background: rgba(255,255,255,.14); border: 1px dashed rgba(255,255,255,.4); border-radius: 10px; padding: 9px 12px; font-size: 11.5px; text-align: center; color: rgba(255,255,255,.85); }

/* ---------------- 示意图: 浏览器框 ---------------- */
.gd-browser { background: #fff; border: 1px solid var(--gd-line); border-radius: 14px; overflow: hidden; box-shadow: 0 24px 48px rgba(15,40,80,.14); }
.gd-browser-bar { display: flex; align-items: center; gap: 6px; background: var(--gd-bg-soft); padding: 10px 14px; border-bottom: 1px solid var(--gd-line-soft); }
.gd-browser-bar i { width: 10px; height: 10px; border-radius: 50%; background: #D9E2EC; }
.gd-browser-bar i:first-child { background: #F2A6A6; }
.gd-browser-bar span { margin-left: 10px; font-size: 11.5px; color: var(--gd-muted); }
.gd-browser-body { padding: 16px; }
.gd-shot-dir { display: flex; align-items: center; gap: 8px; margin-bottom: 12px; flex-wrap: wrap; }
.gd-shot-dir span { font-size: 12px; color: var(--gd-muted); border: 1px solid var(--gd-line); border-radius: 999px; padding: 3px 12px; }
.gd-shot-dir span.on { color: #fff; background: var(--gd-primary); border-color: var(--gd-primary); font-weight: 600; }
.gd-shot-dir em { font-style: normal; font-size: 11.5px; color: var(--gd-muted); }
.gd-shot-io { display: flex; gap: 10px; align-items: stretch; }
.gd-shot-pane { flex: 1; min-width: 0; background: var(--gd-bg); border: 1px solid var(--gd-line-soft); border-radius: 10px; padding: 10px 12px; font-size: 12px; color: var(--gd-body); line-height: 1.7; }
.gd-shot-pane i { display: block; font-style: normal; font-size: 10.5px; letter-spacing: .12em; color: var(--gd-muted); margin-bottom: 6px; }
.gd-pane--en { background: #F3F8FF; border-color: #D8E6FA; }
.gd-shot-arrow { align-self: center; color: var(--gd-primary); font-size: 20px; flex: none; }
.gd-shot-steps { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.gd-shot-steps span { font-size: 11.5px; border-radius: 999px; padding: 4px 12px; background: #EAF6EC; color: #3C7A22; }
.gd-shot-steps span.dl { background: #EAF1FB; color: var(--gd-primary-dark); }

/* ---------------- 示意图: 会议/投票/表单 ---------------- */
.gd-shot-conf { position: relative; background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.2); border-radius: 12px; padding: 16px 14px; margin-bottom: 10px; }
.gd-shot-conf-cover { display: block; font-size: 16px; font-weight: 700; line-height: 1.5; }
.gd-shot-conf-cover i { display: block; font-style: normal; font-size: 12px; font-weight: 400; color: rgba(255,255,255,.8); margin-top: 4px; }
.gd-live { display: inline-block; margin-top: 10px; font-size: 11px; background: rgba(122,194,79,.25); border: 1px solid rgba(122,194,79,.5); color: #D7F0C4; border-radius: 999px; padding: 3px 10px; }
.gd-shot-confrow { background: #fff; color: var(--gd-ink); border-radius: 10px; padding: 10px 12px; font-size: 12.5px; margin-bottom: 8px; position: relative; }
.gd-shot-confrow b { display: block; font-size: 13px; }
.gd-shot-confrow i { display: block; font-style: normal; font-size: 11px; color: var(--gd-muted); margin-top: 2px; }
.gd-shot-confrow u { position: absolute; right: 12px; top: 12px; text-decoration: none; font-size: 10.5px; font-weight: 700; color: #3C7A22; background: #EAF6EC; border-radius: 999px; padding: 2px 9px; }
.gd-shot-admin { background: rgba(255,255,255,.14); border: 1px dashed rgba(255,255,255,.4); border-radius: 10px; padding: 9px 12px; font-size: 11px; text-align: center; color: rgba(255,255,255,.85); }
.gd-shot-vote b { display: block; font-size: 15px; margin-bottom: 4px; }
.gd-shot-vote i { display: block; font-style: normal; font-size: 11.5px; color: rgba(255,255,255,.75); margin-bottom: 12px; }
.gd-shot-vote label { display: flex; justify-content: space-between; gap: 8px; background: #fff; color: var(--gd-ink); border-radius: 10px; padding: 9px 12px; font-size: 13px; margin-bottom: 7px; }
.gd-shot-vote label span { color: var(--gd-muted); font-size: 12px; }
.gd-shot-vote label.on { outline: 2px solid var(--gd-primary); font-weight: 600; }
.gd-shot-vote em { display: block; font-style: normal; font-size: 11px; color: rgba(255,255,255,.75); margin-top: 8px; }
.gd-shot-votebar { background: rgba(255,255,255,.14); border: 1px dashed rgba(255,255,255,.4); border-radius: 10px; padding: 9px 12px; font-size: 11px; text-align: center; color: rgba(255,255,255,.85); margin-top: 10px; }
.gd-shot-form b { display: block; font-size: 15px; }
.gd-shot-form > i { display: block; font-style: normal; font-size: 11.5px; color: rgba(255,255,255,.75); margin-bottom: 10px; }
.gd-fld { display: block; font-size: 11.5px; color: rgba(255,255,255,.85); margin: 8px 0 4px; }
.gd-input { display: block; height: 30px; background: #fff; border-radius: 8px; }
.gd-input--up { display: flex; align-items: center; justify-content: center; color: var(--gd-muted); font-size: 11.5px; }
.gd-opts { display: block; font-style: normal; background: #fff; color: var(--gd-ink); border-radius: 8px; padding: 6px 10px; font-size: 12px; }
.gd-shot-formqr { display: flex; align-items: center; gap: 12px; background: rgba(255,255,255,.14); border: 1px dashed rgba(255,255,255,.4); border-radius: 10px; padding: 10px 12px; margin-top: 10px; }
.gd-qrmini { flex: none; width: 52px; height: 52px; border-radius: 6px; background: conic-gradient(var(--gd-ink) 25%, #fff 0 50%, var(--gd-ink) 0 75%, #fff 0); background-size: 12px 12px; border: 4px solid #fff; }
.gd-shot-formqr i { font-style: normal; font-size: 11px; color: rgba(255,255,255,.85); line-height: 1.7; }

/* ---------------- 流程时间线 ---------------- */
.gd-flow { list-style: none; counter-reset: gdflow; display: flex; flex-wrap: wrap; gap: 14px; margin-top: 40px; padding-top: 28px; border-top: 1px solid var(--gd-line-soft); }
.gd-flow li { counter-increment: gdflow; flex: 1 1 150px; min-width: 150px; background: #fff; border: 1px solid var(--gd-line-soft); border-radius: 12px; padding: 14px 16px; position: relative; }
.gd-chapter--alt .gd-flow li { background: transparent; }
.gd-flow li::before { content: counter(gdflow, decimal-leading-zero); font-family: var(--gd-font-display); font-size: 13px; font-weight: 700; color: var(--gd-primary); display: block; margin-bottom: 6px; }
.gd-flow li b { display: block; font-size: 14px; color: var(--gd-ink); }
.gd-flow li span { display: block; font-size: 12px; color: var(--gd-muted); margin-top: 2px; line-height: 1.6; }

/* ---------------- 结尾 CTA ---------------- */
.gd-final { background: linear-gradient(120deg, #123C7E 0%, var(--gd-deep) 38%, #2169D3 100%); color: #fff; padding: 84px 0 70px; }
.gd-final h2 { font-family: var(--gd-font-display); font-size: 34px; line-height: 1.3; margin: 14px 0 34px; }
.gd-final-grid { display: flex; flex-wrap: wrap; gap: 18px; }
.gd-final-card { flex: 1 1 240px; background: rgba(255,255,255,.1); border: 1px solid rgba(255,255,255,.24); border-radius: 18px; padding: 26px 24px; text-align: center; }
.gd-final-card img { display: block; margin: 0 auto 12px; width: 132px; height: 132px; border-radius: 10px; background: #fff; padding: 5px; }
.gd-final-card b { display: block; font-size: 17px; font-family: var(--gd-font-display); letter-spacing: .02em; }
.gd-final-card .gd-final-site { color: #FFD166; }
.gd-final-card span { display: block; font-size: 13px; color: rgba(255,255,255,.75); margin: 6px 0 16px; }
.gd-final-foot { margin-top: 44px; font-size: 12.5px; color: rgba(255,255,255,.55); text-align: center; }
.gd-foot { background: #0E2C5C; color: rgba(255,255,255,.6); font-size: 12.5px; padding: 18px 0; }
.gd-foot a { color: rgba(255,255,255,.8); }

/* ---------------- 演示模式 ----------------
   v20261103c 修复层级遮挡: 原实现 .gd-stage(fixed, z-index:900)带不透明深蓝渐变背景,
   会把 fixed 且无 z-index 的 .gd-slide 幻灯片整层盖住 —— 表现为"演示模式只有空蓝底"。
   现暗底移至 body(在一切之下绘制), 遮罩透明化仅保留顶栏/提示 chrome(z-index:900 仍浮于幻灯片上方)。 */
/* v20261103c 修复层级遮挡: 暗底移至 body(见文件头部 body.gd-presenting, height:100vh 撑满视口),
   .gd-stage 遮罩透明化仅保留顶栏/提示 chrome(z-index:900 仍浮于幻灯片上方)。 */
.gd-stage { display: none; position: fixed; inset: 0; z-index: 900; background: none; color: #fff; }
body.gd-presenting .gd-stage { display: block; }
.gd-stage-bar { position: absolute; top: 0; left: 0; right: 0; display: flex; align-items: center; gap: 16px; padding: 14px 24px; background: rgba(0,0,0,.18); }
.gd-stage-brand { font-size: 13px; letter-spacing: .08em; color: rgba(255,255,255,.85); white-space: nowrap; }
.gd-stage-progress { flex: 1; height: 5px; background: rgba(255,255,255,.18); border-radius: 3px; overflow: hidden; }
.gd-stage-progress i { display: block; height: 100%; width: 0; background: #FFD166; border-radius: 3px; transition: width .3s var(--gd-ease); }
.gd-stage-timer { font-variant-numeric: tabular-nums; font-size: 15px; font-weight: 700; color: #FFD166; cursor: pointer; min-width: 58px; text-align: center; }
.gd-stage-timer.is-paused { color: rgba(255,255,255,.55); }
.gd-stage-pageno { font-size: 13px; color: rgba(255,255,255,.8); white-space: nowrap; }
.gd-stage-hint { position: absolute; bottom: 18px; left: 0; right: 0; text-align: center; font-size: 12px; color: rgba(255,255,255,.45); }
/* v20261103a 修正: 幻灯片隐藏仅在演示模式下生效 —— hero 也作为第 1 张幻灯片(带 gd-slide 类), 滚动模式下必须正常显示 */
/* v20261103c: align-items 改 flex-start + inner margin:auto —— 短内容垂直居中, 超高内容可完整滚动(H4); 演示态强制显示入场动效目标(H3 兜底) */
/* v20261103e 修复"左右留白过多": ①幻灯 padding 6vw→3vw; ②inner 上限 1080→1560;
   ③解除演示态内层 .gd-wrap/.gd-hero-inner 的 1180 封顶(max-width:none) —— 基底铺满宽屏 */
body.gd-presenting .gd-slide { position: fixed; inset: 74px 0 60px; display: none; align-items: flex-start; justify-content: center; overflow: hidden; padding: 20px 3vw; }
body.gd-presenting .gd-slide.is-on { display: flex; }
body.gd-presenting .gd-slide .gd-slide-inner { margin: auto; max-width: 1560px; width: 100%; }
body.gd-presenting .gd-slide .gd-wrap,
body.gd-presenting .gd-slide .gd-hero-inner { max-width: none; }
/* v20261103d 修复: 纵排(要点/示意图上下堆叠)会示意图压出首屏 —— 演示态要点与示意图必须同行同屏。
   ≥1000px 保持滚动模式同款行布局; 仅窄屏(≤999px)纵排(此时依靠 fitSlide 整页缩放)。 */
body.gd-presenting .gd-slide.is-on .gd-ch-body { gap: 34px; align-items: stretch; }
@media (max-width: 999px) {
    body.gd-presenting .gd-slide.is-on .gd-ch-body { flex-direction: column; gap: 26px; }
    body.gd-presenting .gd-slide.is-on .gd-shot { max-width: 300px; margin: 0 auto; }
}
body.gd-presenting .gd-slide.is-on .gd-ch-body,
body.gd-presenting .gd-slide.is-on .gd-flow,
body.gd-presenting .gd-slide.is-on .gd-final-grid { opacity: 1 !important; transform: none !important; transition: none !important; }
/* 演示态章节底色中性化: --alt 浅底会与白色文字冲突(H2), 暗底已由 body 提供 */
body.gd-presenting .gd-slide.gd-chapter--alt { background: none; }
body.gd-presenting .gd-slide.is-on .gd-ch-head { margin-bottom: 22px; }
body.gd-presenting .gd-slide.is-on h2 { color: #fff; font-size: clamp(26px, 4vw, 44px); }
body.gd-presenting .gd-slide.is-on .gd-ch-lead { color: rgba(255,255,255,.9); font-size: clamp(14px, 1.6vw, 17px); }
body.gd-presenting .gd-slide.is-on .gd-ch-no { -webkit-text-stroke-color: rgba(255,255,255,.5); }
body.gd-presenting .gd-slide.is-on .gd-points li { color: rgba(255,255,255,.88); border-bottom-color: rgba(255,255,255,.14); }
body.gd-presenting .gd-slide.is-on .gd-points li b { color: #fff; }
body.gd-presenting .gd-slide.is-on .gd-points h3 { color: rgba(255,255,255,.6); }
body.gd-presenting .gd-slide.is-on .gd-points li::before { background: #FFD166; box-shadow: 0 0 0 3px rgba(255,209,102,.2); }
body.gd-presenting .gd-slide.is-on .gd-entry { background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.2); }
body.gd-presenting .gd-slide.is-on .gd-entry > span { color: rgba(255,255,255,.6); }
body.gd-presenting .gd-slide.is-on .gd-btn--outline { color: #fff; background: rgba(255,255,255,.1); border-color: rgba(255,255,255,.35); }
body.gd-presenting .gd-slide.is-on .gd-flow { border-top-color: rgba(255,255,255,.16); }
body.gd-presenting .gd-slide.is-on .gd-flow li { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.16); }
body.gd-presenting .gd-slide.is-on .gd-flow li b { color: #fff; }
body.gd-presenting .gd-slide.is-on .gd-flow li span { color: rgba(255,255,255,.7); }
body.gd-presenting .gd-slide.is-on .gd-shot figcaption { color: rgba(255,255,255,.6); }
body.gd-presenting #gEnd.gd-slide.is-on h2 { margin: 14px 0 34px; }

/* ---------------- 响应式 ---------------- */
@media (max-width: 1080px) {
    .gd-topnav { display: none; }
}
@media (max-width: 900px) {
    .gd-hero-inner { flex-direction: column; padding: 54px 22px 48px; }
    .gd-hero-side { width: 100%; max-width: 300px; }
    .gd-hero h1 { font-size: 34px; }
    .gd-ch-body { flex-direction: column; }
    .gd-shot { max-width: 420px; }
}
@media (max-width: 620px) {
    .gd-top-inner { flex-wrap: wrap; gap: 10px; padding: 10px 16px; }
    .gd-top-ops { margin-left: auto; }
    .gd-btn { min-height: 40px; padding: 0 16px; font-size: 13.5px; }
    .gd-hero h1 { font-size: 28px; }
    .gd-hero-sub { font-size: 15px; }
    .gd-ch-no { font-size: 40px; }
    .gd-ch-head h2 { font-size: 25px; }
    .gd-chapter { padding: 54px 0 44px; scroll-margin-top: 64px; }
    .gd-flow li { flex: 1 1 100%; }
    .gd-final h2 { font-size: 26px; }
    .gd-stage-bar { gap: 10px; padding: 12px 14px; }
    .gd-stage-brand { display: none; }
}

/* ---------------- v20261103g: 小程序内链接操作 toast ---------------- */
.gd-toast {
    position: fixed; left: 50%; bottom: calc(40px + env(safe-area-inset-bottom));
    transform: translateX(-50%) translateY(20px);
    max-width: 86vw; z-index: 950;
    background: rgba(16,32,51,.94); color: #fff;
    font-size: 14px; line-height: 1.6; text-align: center;
    border-radius: 999px; padding: 11px 22px;
    opacity: 0; pointer-events: none;
    transition: opacity .25s var(--gd-ease), transform .25s var(--gd-ease);
}
.gd-toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
@media (prefers-reduced-motion: reduce) {
    .gd-toast { transition: none; }
}

/* ---------------- 动效 ---------------- */
@media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    .gd-btn, .gd-topnav a, .gd-stage-progress i { transition: none; }
}