:root {
  --v3-bg: #f2f2f7;
  --v3-card: #ffffff;
  --v3-label: #1c1c1e;
  --v3-label-2: rgba(60, 60, 67, .62);
  --v3-label-3: rgba(60, 60, 67, .38);
  --v3-sep: rgba(60, 60, 67, .14);
  --v3-fill: rgba(118, 118, 128, .12);
  --v3-bar: rgba(249, 249, 251, .78);
  --v3-paused: #c26a12;
  --v3-paused-bg: rgba(255, 149, 0, .14);
  --v3-shadow: 0 1px 2px rgba(0, 0, 0, .04), 0 8px 24px rgba(0, 0, 0, .06);
  --v3-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --v3-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --v3-sticky-top: 0px;
}

html body .ycf-v3 {
  
  --v3-accent: var(--v3-accent-l, #2e9e8a);
  --v3-tint: var(--v3-tint-l, rgba(46, 158, 138, .12));
  --v3-case-bg: var(--v3-case-bg-l, #eef6f4);
  --v3-case-fg: var(--v3-case-fg-l, #12201d);
  --v3-case-fg-2: var(--v3-case-fg2-l, rgba(18, 32, 29, .66));
  --v3-case-card: var(--v3-case-card-l, rgba(255, 255, 255, .7));
  font-family: var(--v3-font);
  color: var(--v3-label);
  background: var(--v3-bg);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-align: left;
}
html body .ycf-v3 *, html body .ycf-v3 *::before, html body .ycf-v3 *::after { box-sizing: border-box; }
html body .ycf-v3 img { display: block; max-width: 100%; height: auto; }
html body .ycf-v3 a { color: inherit; text-decoration: none; }
html body .ycf-v3 :where(h1, h2, h3, p, ul, ol, figure, dl, dd) { margin: 0; padding: 0; }
html body .ycf-v3 :where(ul, ol) { list-style: none; }
html body .ycf-v3 :where(h1, h2, h3) { font-family: var(--v3-display); text-wrap: balance; color: inherit; }
html body .ycf-v3 :focus-visible { outline: 3px solid var(--v3-accent); outline-offset: 3px; border-radius: 8px; }

html body .ycf-v3 .v3-wrap { width: 100%; max-width: 1120px; margin-inline: auto; display: grid; grid-template-columns: minmax(0, 1fr); gap: 28px; padding-block: 24px 120px; }
html body .ycf-v3 .v3-section { display: grid; grid-template-columns: minmax(0, 1fr); gap: 14px; scroll-margin-top: calc(var(--v3-sticky-top) + 72px); }
html body .ycf-v3 .v3-section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; padding-inline: 4px; }
html body .ycf-v3 .v3-section-head h2 { font-size: 28px; line-height: 1.2; font-weight: 700; letter-spacing: -.01em; }
html body .ycf-v3 .v3-section-head a { color: var(--v3-accent); font-size: 15px; font-weight: 600; white-space: nowrap; }
html body .ycf-v3 .v3-foot { color: var(--v3-label-2); font-size: 13px; padding-inline: 4px; }


html body .ycf-v3 .v3-hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.08fr); gap: 40px; align-items: center; padding-block: 16px 4px; }
html body .ycf-v3 .v3-hero-copy { display: grid; gap: 18px; min-width: 0; }
html body .ycf-v3 .v3-kicker { display: inline-flex; align-items: center; gap: 8px; width: fit-content; padding: 5px 12px 5px 10px; border-radius: 999px; background: var(--v3-card); box-shadow: var(--v3-shadow); color: var(--v3-label-2); font-size: 13px; font-weight: 600; letter-spacing: .02em; }
html body .ycf-v3 .v3-kicker i { width: 8px; height: 8px; border-radius: 50%; background: var(--v3-series); }
html body .ycf-v3 .v3-hero h1 { font-size: clamp(40px, 6vw, 64px); line-height: 1.04; font-weight: 800; letter-spacing: -.025em; }
html body .ycf-v3 .v3-lead { font-size: 19px; line-height: 1.6; color: var(--v3-label-2); max-width: 30em; }
html body .ycf-v3 .v3-chips { display: flex; flex-wrap: wrap; gap: 8px; }
html body .ycf-v3 .v3-chip { padding: 6px 12px; border-radius: 999px; background: var(--v3-fill); color: var(--v3-label); font-size: 14px; font-weight: 600; font-variant-numeric: tabular-nums; }
html body .ycf-v3 .v3-status { display: inline-flex; align-items: center; gap: 6px; width: fit-content; padding: 5px 12px; border-radius: 999px; background: var(--v3-paused-bg); color: var(--v3-paused); font-size: 14px; font-weight: 700; }
html body .ycf-v3 .v3-status::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
html body .ycf-v3 .v3-actions { display: flex; flex-wrap: wrap; gap: 10px; }
html body .ycf-v3 .v3-btn { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 22px; border: 0; border-radius: 999px; font: 600 16px/1 var(--v3-font); cursor: pointer; transition: transform .15s ease, opacity .15s ease; }
html body .ycf-v3 .v3-btn:active { transform: scale(.97); }
html body .ycf-v3 .v3-btn--primary { background: var(--v3-accent); color: var(--v3-accent-ink, #fff); }
html body .ycf-v3 .v3-btn--tinted { background: var(--v3-tint); color: var(--v3-accent); }
html body .ycf-v3 .v3-note { font-size: 14px; color: var(--v3-label-2); max-width: 34em; }
html body .ycf-v3 .v3-hero-art { position: relative; border-radius: 30px; overflow: hidden; background: var(--v3-art-bg, var(--v3-card)); box-shadow: var(--v3-shadow); aspect-ratio: 1 / 1; max-width: 100%; }
html body .ycf-v3 .v3-hero-art img { width: 100%; height: 100%; object-fit: contain; }
html body .ycf-v3 .v3-hero-art--trio { display: grid; grid-template-columns: repeat(var(--v3-trio-n, 3), minmax(0, 1fr)); gap: 6px; padding: 6px; aspect-ratio: 4 / 3; background: var(--v3-card); }
html body .ycf-v3 .v3-hero-art--trio a { border-radius: 24px; overflow: hidden; background: var(--v3-trio-bg, var(--v3-fill)); }
html body .ycf-v3 .v3-hero-art--trio img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s ease; }
html body .ycf-v3 .v3-hero-art--trio a:hover img { transform: scale(1.04); }


html body .ycf-v3 .v3-group { background: var(--v3-card); border-radius: 18px; overflow: hidden; box-shadow: var(--v3-shadow); }
html body .ycf-v3 .v3-row { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 16px; padding: 14px 20px; border-top: 1px solid var(--v3-sep); font-size: 16px; }
html body .ycf-v3 .v3-row:first-child { border-top: 0; }
html body .ycf-v3 .v3-row dt { color: var(--v3-label-2); }
html body .ycf-v3 .v3-row dd { min-width: 0; }
html body .ycf-v3 .v3-link-row { display: flex; align-items: center; gap: 14px; padding: 14px 20px; color: var(--v3-label); }
html body .ycf-v3 .v3-link-row img { width: 52px; height: 52px; border-radius: 12px; object-fit: cover; background: var(--v3-fill); flex: none; }
html body .ycf-v3 .v3-link-row div { min-width: 0; flex: 1; }
html body .ycf-v3 .v3-link-row b { display: block; font-size: 16px; }
html body .ycf-v3 .v3-link-row span { color: var(--v3-label-2); font-size: 14px; }
html body .ycf-v3 .v3-link-row::after { content: "›"; color: var(--v3-label-3); font-size: 26px; line-height: 1; }


html body .ycf-v3 .v3-seg { position: sticky; top: var(--v3-sticky-top); z-index: 5; display: flex; justify-content: center; padding-block: 8px; }
html body .ycf-v3 .v3-seg nav { display: flex; gap: 2px; padding: 3px; border-radius: 12px; background: var(--v3-bar); backdrop-filter: saturate(180%) blur(20px); -webkit-backdrop-filter: saturate(180%) blur(20px); box-shadow: 0 0 0 1px var(--v3-sep); overflow-x: auto; max-width: 100%; scrollbar-width: none; }
html body .ycf-v3 .v3-seg a { padding: 7px 16px; border-radius: 9px; font-size: 14px; font-weight: 600; color: var(--v3-label); white-space: nowrap; }
html body .ycf-v3 .v3-seg a:hover { background: var(--v3-card); box-shadow: 0 1px 3px rgba(0, 0, 0, .1); }


html body .ycf-v3 .v3-case { display: grid; gap: 40px; padding: clamp(24px, 5vw, 56px); border-radius: 32px; background: var(--v3-case-bg); color: var(--v3-case-fg); }
html body .ycf-v3 .v3-case-head { display: grid; gap: 10px; max-width: 40em; }
html body .ycf-v3 .v3-eyebrow { font-size: 13px; font-weight: 700; letter-spacing: .12em; color: var(--v3-case-accent, var(--v3-accent)); }
html body .ycf-v3 .v3-case-head h2 { font-size: clamp(28px, 4vw, 40px); line-height: 1.15; font-weight: 800; letter-spacing: -.02em; }
html body .ycf-v3 .v3-case-head p { color: var(--v3-case-fg-2); font-size: 17px; }
html body .ycf-v3 .v3-point { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: clamp(20px, 4vw, 48px); align-items: center; }
html body .ycf-v3 .v3-point--flip .v3-figure { order: 2; }
html body .ycf-v3 .v3-figure { border-radius: 24px; overflow: hidden; background: var(--v3-case-card); }
html body .ycf-v3 .v3-figure img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; object-position: var(--v3-focus, 50% 30%); }
html body .ycf-v3 .v3-figure a { display: block; }
html body .ycf-v3 .v3-point-copy { display: grid; gap: 12px; min-width: 0; }
html body .ycf-v3 .v3-point-copy small { font-size: 13px; font-weight: 700; letter-spacing: .1em; color: var(--v3-case-accent, var(--v3-accent)); }
html body .ycf-v3 .v3-point-copy h3 { font-size: 24px; line-height: 1.3; font-weight: 700; }
html body .ycf-v3 .v3-point-copy p { color: var(--v3-case-fg-2); font-size: 17px; max-width: 26em; }
html body .ycf-v3 .v3-video { position: relative; display: block; color: #fff; border-radius: 24px; overflow: hidden; background: #000; aspect-ratio: 16 / 9; max-width: 100%; }
html body .ycf-v3 .v3-video img { width: 100%; height: 100%; object-fit: cover; opacity: .82; transition: opacity .2s ease, transform .4s ease; }
html body .ycf-v3 .v3-video:hover img { opacity: 1; transform: scale(1.02); }
html body .ycf-v3 .v3-video span { position: absolute; left: 20px; bottom: 18px; display: inline-flex; align-items: center; gap: 10px; padding: 9px 16px 9px 10px; border-radius: 999px; background: rgba(255, 255, 255, .86); color: #111; font-size: 15px; font-weight: 600; backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
html body .ycf-v3 .v3-video span::before { content: ""; width: 26px; height: 26px; border-radius: 50%; background: #111 url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 26 26'%3E%3Cpath d='M10 8l9 5-9 5z' fill='%23fff'/%3E%3C/svg%3E") center / 26px no-repeat; }
html body .ycf-v3 .v3-videos { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 320px), 1fr)); gap: 16px; }
html body .ycf-v3 .v3-process { display: grid; gap: 14px; }
html body .ycf-v3 .v3-process h3 { font-size: 20px; font-weight: 700; }
html body .ycf-v3 .v3-process ol { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
html body .ycf-v3 .v3-process li { position: relative; border-radius: 22px; overflow: hidden; background: var(--v3-case-card); }
html body .ycf-v3 .v3-process li img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; }
html body .ycf-v3 .v3-process li b { position: absolute; left: 14px; top: 14px; padding: 4px 12px; border-radius: 999px; background: rgba(0, 0, 0, .55); color: #fff; font-size: 13px; font-weight: 700; letter-spacing: .04em; }
html body .ycf-v3 .v3-band { border-radius: 22px; overflow: hidden; background: var(--v3-case-card); }
html body .ycf-v3 .v3-band img { width: 100%; }
html body .ycf-v3 .v3-case-foot { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; color: var(--v3-case-fg-2); font-size: 14px; }
html body .ycf-v3 .v3-case-foot a { color: var(--v3-case-accent, var(--v3-accent)); font-weight: 600; }


html body .ycf-v3 .v3-teacher { display: grid; gap: 16px; padding: 22px; }
html body .ycf-v3 .v3-teacher-id { display: flex; align-items: center; gap: 16px; }
html body .ycf-v3 .v3-avatar { display: grid; place-items: center; flex: none; width: 72px; height: 72px; border-radius: 50%; overflow: hidden; background: var(--v3-tint); color: var(--v3-accent); font: 700 28px/1 var(--v3-display); }
html body .ycf-v3 .v3-avatar img { width: 100%; height: 100%; object-fit: cover; }
html body .ycf-v3 .v3-teacher-id b { display: block; font-size: 21px; font-family: var(--v3-display); }
html body .ycf-v3 .v3-teacher-id em { font-style: normal; color: var(--v3-label-2); font-size: 14px; }
html body .ycf-v3 .v3-teacher-stat { display: flex; align-items: baseline; gap: 10px; padding: 12px 16px; border-radius: 14px; background: var(--v3-tint); color: var(--v3-label); font-size: 15px; }
html body .ycf-v3 .v3-teacher-stat b { color: var(--v3-accent); font: 800 30px/1 var(--v3-display); font-variant-numeric: tabular-nums; }
html body .ycf-v3 .v3-teacher-points { display: grid; gap: 8px; }
html body .ycf-v3 .v3-teacher-points li { position: relative; padding-left: 18px; font-size: 16px; line-height: 1.6; }
html body .ycf-v3 .v3-teacher-points li::before { content: ""; position: absolute; left: 2px; top: .62em; width: 7px; height: 7px; border-radius: 50%; background: var(--v3-accent); }
html body .ycf-v3 .v3-teacher-works { display: grid; gap: 10px; padding-top: 14px; border-top: 1px solid var(--v3-sep); }
html body .ycf-v3 .v3-teacher-works small { color: var(--v3-label-2); font-size: 13px; font-weight: 600; letter-spacing: .06em; }
html body .ycf-v3 .v3-teacher-works div { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 150px), 1fr)); gap: 10px; }
html body .ycf-v3 .v3-teacher-works a { display: grid; gap: 6px; color: var(--v3-label); font-size: 14px; font-weight: 600; }
html body .ycf-v3 .v3-teacher-works img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; border-radius: 14px; background: var(--v3-fill); }


html body .ycf-v3 .v3-works { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 220px), 1fr)); gap: 14px; }
html body .ycf-v3 .v3-work { position: relative; display: grid; color: var(--v3-label); border-radius: 20px; overflow: hidden; background: var(--v3-card); box-shadow: var(--v3-shadow); }
html body .ycf-v3 .v3-work img { width: 100%; aspect-ratio: 4 / 5; object-fit: cover; background: var(--v3-fill); transition: transform .4s ease; }
html body .ycf-v3 .v3-work:hover img { transform: scale(1.03); }
html body .ycf-v3 .v3-work figcaption { padding: 10px 14px 12px; font-size: 14px; font-weight: 600; }
html body .ycf-v3 .v3-work i { position: absolute; top: 10px; right: 10px; padding: 3px 9px; border-radius: 999px; background: rgba(0, 0, 0, .55); color: #fff; font-size: 12px; font-style: normal; font-weight: 600; }


html body .ycf-v3 .v3-cases { display: grid; grid-template-columns: repeat(var(--v3-case-n, 3), minmax(0, 1fr)); gap: 16px; }
html body .ycf-v3 .v3-case-card { --v3-cc-bg: var(--v3-cc-bg-l); --v3-cc-fg: var(--v3-cc-fg-l); --v3-cc-accent: var(--v3-cc-accent-l); display: grid; grid-template-rows: auto 1fr; border-radius: 26px; overflow: hidden; background: var(--v3-cc-bg); color: var(--v3-cc-fg); box-shadow: var(--v3-shadow); transition: transform .2s ease; }
html body .ycf-v3 .v3-case-card:hover { transform: translateY(-3px); }
html body .ycf-v3 .v3-case-card img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; }
html body .ycf-v3 .v3-case-card div { display: grid; gap: 8px; align-content: start; padding: 18px 20px 22px; }
html body .ycf-v3 .v3-case-card h3 { font-size: 22px; font-weight: 800; }
html body .ycf-v3 .v3-case-card p { font-size: 15px; opacity: .78; }
html body .ycf-v3 .v3-case-card span { font-size: 14px; font-weight: 700; color: var(--v3-cc-accent); font-variant-numeric: tabular-nums; }
html body .ycf-v3 .v3-stack { display: flex; height: 14px; border-radius: 999px; overflow: hidden; gap: 2px; }
html body .ycf-v3 .v3-stack span { background: var(--v3-seg-c, var(--v3-label-3)); }
html body .ycf-v3 .v3-contents { padding: 18px 20px 6px; display: grid; gap: 14px; }
html body .ycf-v3 .v3-contents ul { display: grid; }
html body .ycf-v3 .v3-contents li { display: grid; grid-template-columns: 12px minmax(0, 1fr) auto; gap: 12px; align-items: baseline; padding: 12px 0; border-top: 1px solid var(--v3-sep); }
html body .ycf-v3 .v3-contents li i { width: 10px; height: 10px; border-radius: 3px; background: var(--v3-seg-c, var(--v3-label-3)); }
html body .ycf-v3 .v3-contents li b { font-size: 16px; }
html body .ycf-v3 .v3-contents li p { color: var(--v3-label-2); font-size: 14px; }
html body .ycf-v3 .v3-contents li em { font-style: normal; font-weight: 700; font-variant-numeric: tabular-nums; }
html body .ycf-v3 .v3-periods { display: flex; flex-wrap: wrap; gap: 8px; }


html body .ycf-v3 .v3-faq details { border-top: 1px solid var(--v3-sep); }
html body .ycf-v3 .v3-faq details:first-child { border-top: 0; }
html body .ycf-v3 .v3-faq summary { display: flex; justify-content: space-between; gap: 12px; padding: 15px 20px; font-weight: 600; cursor: pointer; list-style: none; }
html body .ycf-v3 .v3-faq summary::-webkit-details-marker { display: none; }
html body .ycf-v3 .v3-faq summary::after { content: "›"; color: var(--v3-label-3); font-size: 22px; line-height: 1; transition: transform .2s ease; }
html body .ycf-v3 .v3-faq details[open] summary::after { transform: rotate(90deg); }
html body .ycf-v3 .v3-faq p { padding: 0 20px 16px; color: var(--v3-label-2); font-size: 15px; }


@media (max-width: 860px) {
  html body .ycf-v3 .v3-hero { grid-template-columns: minmax(0, 1fr); gap: 24px; }
  html body .ycf-v3 .v3-hero-art { order: -1; }
  html body .ycf-v3 .v3-point { grid-template-columns: minmax(0, 1fr); }
  html body .ycf-v3 .v3-point--flip .v3-figure { order: 0; }
  html body .ycf-v3 .v3-cases { grid-template-columns: minmax(0, 1fr); }
  html body .ycf-v3 .v3-case-card { grid-template-columns: 132px minmax(0, 1fr); grid-template-rows: none; }
  html body .ycf-v3 .v3-case-card img { height: 100%; }
}
@media (max-width: 600px) {
  html body .ycf-v3 { font-size: 16px; }
  html body .ycf-v3 .v3-wrap { gap: 22px; }
  html body .ycf-v3 .v3-lead { font-size: 17px; }
  html body .ycf-v3 .v3-section-head h2 { font-size: 23px; }
  html body .ycf-v3 .v3-case { border-radius: 26px; gap: 30px; }
  html body .ycf-v3 .v3-row { grid-template-columns: 88px minmax(0, 1fr); padding: 12px 16px; }
  html body .ycf-v3 .v3-process ol { gap: 10px; }
  html body .ycf-v3 .v3-actions .v3-btn { flex: 1 1 auto; }
}
@media (prefers-reduced-motion: reduce) {
  html body .ycf-v3 *, html body .ycf-v3 *::before, html body .ycf-v3 *::after { transition: none !important; }
}
html body .ycf-v3 .v3-inline-consult { border: 0; background: none; padding: 0; color: var(--v3-accent); font: inherit; font-weight: 600; cursor: pointer; text-decoration: underline; text-underline-offset: 3px; }
html body .ycf-v3 .v3-group .v3-link-row + .v3-link-row { border-top: 1px solid var(--v3-sep); }
html body .ycf-v3 .v3-contents li a { color: var(--v3-accent); }

html body .ycf-v3 .v3-section.ycf-course-watch > :not(.v3-section-head) { padding: 20px 22px; border-radius: 18px; background: var(--v3-card); box-shadow: var(--v3-shadow); color: var(--v3-label); }
html body .ycf-v3 .v3-section.ycf-course-watch > :not(.v3-section-head) a { color: var(--v3-accent); font-weight: 600; }

html body .ycf-v3 .v3-video-live { display: grid; gap: 10px; }
html body .ycf-v3 .v3-video-frame { border-radius: 24px; overflow: hidden; background: #000; }
html body .ycf-v3 .v3-video-frame .ycf-video-bed-embed { border-radius: 0 !important; }
html body .ycf-v3 .v3-video-live figcaption { color: var(--v3-case-fg-2); font-size: 14px; font-weight: 600; }