.practice-preview-scope[data-astro-cid-zvf4qtfv]{--practice-page: #050608;--practice-ink: rgb(5 7 10 / .9);--practice-panel: rgb(14 17 21 / .82);--practice-video: rgb(2 4 7 / .92);--practice-line: rgb(243 154 70 / .24);--practice-accent: #f2a14a;--practice-accent-strong: #e87324;--practice-text: #f4f7fb;--practice-muted: #a9b8c9;--practice-cool: #8ed7ff;--practice-glass-highlight: rgb(255 255 255 / .1);--practice-warm-glow: rgb(239 130 55 / .1);--practice-cool-glow: rgb(71 174 220 / .055);--practice-sans: Inter, "Aptos", "Segoe UI Variable", "PingFang SC", "Microsoft YaHei", sans-serif;--practice-english: "Aptos", "Segoe UI Variable", Inter, "Helvetica Neue", sans-serif;--practice-chinese: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;padding:1rem 0 5rem;border-radius:1.35rem;background:radial-gradient(circle at 92% 2%,var(--practice-warm-glow),transparent 24rem),radial-gradient(circle at 4% 52%,var(--practice-cool-glow),transparent 26rem),linear-gradient(135deg,color-mix(in srgb,var(--practice-page) 90%,transparent),var(--practice-page));color:var(--practice-text);color-scheme:dark;-webkit-font-smoothing:antialiased;transition:color .24s ease,background .36s ease}.practice-preview-scope[data-astro-cid-zvf4qtfv][data-practice-theme=light]{--practice-page: #e9f2f7;--practice-ink: rgb(248 252 255 / .84);--practice-panel: rgb(255 255 255 / .66);--practice-video: rgb(232 241 247 / .76);--practice-line: rgb(26 76 108 / .15);--practice-accent: #e68b36;--practice-accent-strong: #c9651b;--practice-text: #14324a;--practice-muted: #6c8192;--practice-cool: #1d7ea8;--practice-glass-highlight: rgb(255 255 255 / .78);--practice-warm-glow: rgb(230 139 54 / .06);--practice-cool-glow: rgb(66 143 181 / .14);color-scheme:light}body[data-english-practice-theme=dark]{background:#050608;transition:background .36s ease}body[data-english-practice-theme=light]{background:#e9f2f7;transition:background .36s ease}.week-guide[data-astro-cid-zvf4qtfv],.study-workspace[data-astro-cid-zvf4qtfv]{font-family:var(--practice-sans);transition:background .36s ease,border-color .24s ease,box-shadow .36s ease}.week-guide[data-astro-cid-zvf4qtfv]{margin:2.25rem 0 3rem;border:1px solid var(--practice-line);background:radial-gradient(circle at 90% 0%,color-mix(in srgb,var(--practice-accent) 16%,transparent),transparent 20rem),var(--practice-panel);color:var(--practice-text);border-radius:1rem;box-shadow:inset 0 1px 0 var(--practice-glass-highlight),0 1.4rem 4rem #00000029;backdrop-filter:blur(22px) saturate(135%)}.week-guide-header[data-astro-cid-zvf4qtfv],.week-selection[data-astro-cid-zvf4qtfv],.workspace-bar[data-astro-cid-zvf4qtfv],.knowledge-strip[data-astro-cid-zvf4qtfv]>header[data-astro-cid-zvf4qtfv]{display:flex;align-items:end;justify-content:space-between;gap:1.5rem}.week-guide-header[data-astro-cid-zvf4qtfv]{padding:1.35rem 1.4rem 1.15rem}.week-guide-tools[data-astro-cid-zvf4qtfv]{display:flex;align-items:center;gap:.8rem}.practice-theme-toggle[data-astro-cid-zvf4qtfv]{display:inline-flex;align-items:center;gap:.35rem;border:1px solid var(--practice-line);border-radius:999px;padding:.38rem .65rem;background:color-mix(in srgb,var(--practice-accent) 8%,transparent);color:var(--practice-muted);font:.68rem var(--font-mono-readable)}.practice-theme-toggle[data-astro-cid-zvf4qtfv]:hover,.practice-theme-toggle[data-astro-cid-zvf4qtfv]:focus-visible{border-color:var(--practice-accent);color:var(--practice-text)}.practice-theme-toggle[data-astro-cid-zvf4qtfv]>span[data-astro-cid-zvf4qtfv]:first-child{color:var(--practice-accent);font-size:.9rem}.week-count[data-astro-cid-zvf4qtfv]{flex:0 0 auto;color:var(--practice-muted);font:.72rem var(--font-mono-readable);letter-spacing:.06em}.week-count[data-astro-cid-zvf4qtfv] b[data-astro-cid-zvf4qtfv]{color:var(--practice-accent);font-size:1rem}.week-guide-header[data-astro-cid-zvf4qtfv] p[data-astro-cid-zvf4qtfv],.week-selection[data-astro-cid-zvf4qtfv]>span[data-astro-cid-zvf4qtfv],.week-selection[data-astro-cid-zvf4qtfv] strong[data-astro-cid-zvf4qtfv]+p[data-astro-cid-zvf4qtfv],.workspace-bar[data-astro-cid-zvf4qtfv] p[data-astro-cid-zvf4qtfv],.transcript-header[data-astro-cid-zvf4qtfv] span[data-astro-cid-zvf4qtfv],.video-stage[data-astro-cid-zvf4qtfv]>span[data-astro-cid-zvf4qtfv],.knowledge-strip[data-astro-cid-zvf4qtfv] header[data-astro-cid-zvf4qtfv] span[data-astro-cid-zvf4qtfv],.knowledge-table[data-astro-cid-zvf4qtfv] th[data-astro-cid-zvf4qtfv],.knowledge-table[data-astro-cid-zvf4qtfv] code[data-astro-cid-zvf4qtfv]{font-family:var(--font-mono-readable)}.week-guide-header[data-astro-cid-zvf4qtfv]>div[data-astro-cid-zvf4qtfv]>p[data-astro-cid-zvf4qtfv],.workspace-bar[data-astro-cid-zvf4qtfv] p[data-astro-cid-zvf4qtfv],.knowledge-strip[data-astro-cid-zvf4qtfv] header[data-astro-cid-zvf4qtfv] span[data-astro-cid-zvf4qtfv]{margin:0;color:var(--practice-accent);font-size:.7rem;letter-spacing:.11em}.week-guide[data-astro-cid-zvf4qtfv] h2[data-astro-cid-zvf4qtfv],.workspace-bar[data-astro-cid-zvf4qtfv] h2[data-astro-cid-zvf4qtfv],.knowledge-strip[data-astro-cid-zvf4qtfv] h3[data-astro-cid-zvf4qtfv]{margin:.35rem 0 0;color:var(--practice-text)}.week-guide[data-astro-cid-zvf4qtfv] h2[data-astro-cid-zvf4qtfv]{font-size:clamp(1.35rem,2.6vw,2.05rem)}.lesson-navigator[data-astro-cid-zvf4qtfv]{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:stretch;border-block:1px solid var(--practice-line)}.week-rail-mask[data-astro-cid-zvf4qtfv]{min-width:0;overflow:hidden}.week-days[data-astro-cid-zvf4qtfv]{display:flex;min-width:100%;overflow-x:auto;scroll-behavior:smooth;scroll-snap-type:x mandatory;scrollbar-width:none;touch-action:pan-x}.week-days[data-astro-cid-zvf4qtfv]::-webkit-scrollbar{display:none}.week-step[data-astro-cid-zvf4qtfv]{display:inline-flex;align-items:center;gap:.35rem;border:0;padding:.75rem .8rem;background:color-mix(in srgb,var(--practice-ink) 88%,transparent);color:var(--practice-muted);font:inherit}.week-step[data-astro-cid-zvf4qtfv]:first-child{border-right:1px solid var(--practice-line)}.week-step[data-astro-cid-zvf4qtfv]:last-child{border-left:1px solid var(--practice-line)}.week-step[data-astro-cid-zvf4qtfv] span[data-astro-cid-zvf4qtfv]{color:var(--practice-accent);font:1.1rem var(--practice-english)}.week-step[data-astro-cid-zvf4qtfv] small[data-astro-cid-zvf4qtfv]{font:.68rem var(--practice-chinese)}.week-step[data-astro-cid-zvf4qtfv]:hover:not(:disabled){background:color-mix(in srgb,var(--practice-accent) 15%,transparent);color:var(--practice-text)}.week-step[data-astro-cid-zvf4qtfv]:disabled{cursor:not-allowed;opacity:.38}.week-day[data-astro-cid-zvf4qtfv]{min-width:8.9rem;flex:1 0 8.9rem;border:0;border-right:1px solid var(--practice-line);padding:.85rem .75rem .9rem;background:transparent;color:var(--practice-muted);font:inherit;text-align:left;transition:background var(--motion-fast),color var(--motion-fast);scroll-snap-align:start}.week-day[data-astro-cid-zvf4qtfv]:last-child{border-right:0}.week-day[data-astro-cid-zvf4qtfv]:hover,.week-day[data-astro-cid-zvf4qtfv].is-selected{background:color-mix(in srgb,var(--practice-accent) 13%,transparent);color:var(--practice-text)}.week-day[data-astro-cid-zvf4qtfv]>span[data-astro-cid-zvf4qtfv],.week-day[data-astro-cid-zvf4qtfv]>strong[data-astro-cid-zvf4qtfv],.week-day[data-astro-cid-zvf4qtfv]>small[data-astro-cid-zvf4qtfv]{display:block}.week-day[data-astro-cid-zvf4qtfv]>span[data-astro-cid-zvf4qtfv]{color:var(--practice-accent);font-family:var(--font-mono-readable);font-size:.64rem;letter-spacing:.09em}.week-day[data-astro-cid-zvf4qtfv]>strong[data-astro-cid-zvf4qtfv]{margin-top:.3rem;color:inherit;font-family:var(--practice-english);font-size:1.15rem}.week-day[data-astro-cid-zvf4qtfv]>small[data-astro-cid-zvf4qtfv]{overflow:hidden;margin-top:.55rem;color:inherit;font-family:var(--practice-chinese);font-size:.78rem;line-height:1.4;text-overflow:ellipsis;white-space:nowrap}.week-selection[data-astro-cid-zvf4qtfv]{align-items:center;padding:1rem 1.4rem .85rem}.week-selection[data-astro-cid-zvf4qtfv]>span[data-astro-cid-zvf4qtfv]{color:var(--practice-accent);font-size:.7rem}.week-selection[data-astro-cid-zvf4qtfv]>div[data-astro-cid-zvf4qtfv]{min-width:0}.week-selection[data-astro-cid-zvf4qtfv] strong[data-astro-cid-zvf4qtfv],.week-selection[data-astro-cid-zvf4qtfv] p[data-astro-cid-zvf4qtfv]{display:block}.week-selection[data-astro-cid-zvf4qtfv] strong[data-astro-cid-zvf4qtfv]{color:var(--practice-text);font-family:var(--practice-chinese);font-size:1rem}.week-selection[data-astro-cid-zvf4qtfv] strong[data-astro-cid-zvf4qtfv]+p[data-astro-cid-zvf4qtfv]{margin:.25rem 0 0;color:var(--practice-muted);font-size:.68rem}.week-selection[data-astro-cid-zvf4qtfv]>a[data-astro-cid-zvf4qtfv]{flex:0 0 auto;margin-left:auto;color:var(--practice-cool);font:.7rem var(--font-mono-readable);text-decoration:none}.week-guide-tip[data-astro-cid-zvf4qtfv]{margin:0;border-top:1px solid var(--practice-line);padding:.65rem 1.4rem .8rem;color:var(--practice-muted);font:.72rem/1.45 var(--practice-chinese)}.study-workspace[data-astro-cid-zvf4qtfv]{--video-panel: 55%;overflow:visible;border:1px solid var(--practice-line);background:var(--practice-ink);color:var(--practice-text);border-radius:1.1rem;box-shadow:inset 0 1px 0 var(--practice-glass-highlight),0 1.5rem 4rem #0000002e;backdrop-filter:blur(24px) saturate(135%)}.workspace-bar[data-astro-cid-zvf4qtfv]{align-items:center;border-bottom:1px solid var(--practice-line);padding:1rem 1.25rem}.workspace-bar[data-astro-cid-zvf4qtfv] h2[data-astro-cid-zvf4qtfv]{font-family:var(--practice-english);font-size:clamp(1.3rem,2.6vw,1.8rem);letter-spacing:-.025em}.workspace-actions[data-astro-cid-zvf4qtfv]{display:flex;gap:.4rem}.layout-button[data-astro-cid-zvf4qtfv]{border:1px solid var(--practice-line);padding:.48rem .7rem;background:transparent;color:var(--practice-muted);font:.74rem var(--practice-chinese)}.layout-button[data-astro-cid-zvf4qtfv]:hover,.layout-button[data-astro-cid-zvf4qtfv].is-active{border-color:var(--practice-accent);background:var(--practice-accent);color:#132235}.workspace-main[data-astro-cid-zvf4qtfv]{display:grid;grid-template-columns:var(--video-panel) 2rem minmax(20rem,1fr);align-items:start;padding:1rem}.video-panel[data-astro-cid-zvf4qtfv]{display:flex;align-self:start;height:100%;min-width:0;flex-direction:column;border:1px solid color-mix(in srgb,var(--practice-cool) 22%,var(--practice-line));padding:.85rem;background:var(--practice-video)}.video-stage[data-astro-cid-zvf4qtfv]{position:relative;overflow:hidden;width:100%;flex:0 0 auto;aspect-ratio:16 / 9;border-radius:.45rem;background:#060a0f}.video-stage[data-astro-cid-zvf4qtfv]>[data-astro-cid-zvf4qtfv][data-video-content]{position:absolute;inset:0}.video-stage[data-astro-cid-zvf4qtfv]>span[data-astro-cid-zvf4qtfv]{position:absolute;z-index:1;top:.85rem;left:.85rem;color:var(--practice-accent);font-size:.65rem;letter-spacing:.11em;pointer-events:none}.video-stage[data-astro-cid-zvf4qtfv] iframe[data-astro-cid-zvf4qtfv]{display:block;width:100%;height:100%;aspect-ratio:16 / 9;border:0;background:#060a0f}.practice-preview-scope .video-stage iframe{display:block;width:100%;height:100%;border:0;background:#060a0f}.video-unavailable[data-astro-cid-zvf4qtfv],.practice-preview-scope .video-unavailable{display:grid;min-height:18rem;margin:0;place-items:center;padding:2rem;background:color-mix(in srgb,var(--practice-cool) 8%,transparent);color:var(--practice-muted);font:.85rem/1.6 var(--practice-chinese);text-align:center}.video-footer[data-astro-cid-zvf4qtfv]{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:.85rem .05rem .05rem}.video-footer[data-astro-cid-zvf4qtfv] strong[data-astro-cid-zvf4qtfv],.video-footer[data-astro-cid-zvf4qtfv] span[data-astro-cid-zvf4qtfv]{display:block}.video-footer[data-astro-cid-zvf4qtfv] strong[data-astro-cid-zvf4qtfv]{color:var(--practice-text);font-family:var(--practice-english);font-size:1rem;letter-spacing:-.015em}.video-footer[data-astro-cid-zvf4qtfv] span[data-astro-cid-zvf4qtfv]{margin-top:.25rem;color:var(--practice-muted);font-family:var(--font-mono-readable);font-size:.66rem}.video-footer[data-astro-cid-zvf4qtfv] a[data-astro-cid-zvf4qtfv]{flex:0 0 auto;color:var(--practice-cool);font-family:var(--font-mono-readable);font-size:.7rem;text-decoration:none}.split-handle[data-astro-cid-zvf4qtfv]{display:grid;position:relative;z-index:2;min-width:2rem;min-height:20rem;place-items:center;cursor:col-resize;touch-action:none;user-select:none}.split-handle[data-astro-cid-zvf4qtfv]>span[data-astro-cid-zvf4qtfv]{width:.18rem;height:3rem;background:color-mix(in srgb,var(--practice-accent) 38%,var(--practice-line));box-shadow:0 -.75rem color-mix(in srgb,var(--practice-accent) 38%,var(--practice-line)),0 .75rem color-mix(in srgb,var(--practice-accent) 38%,var(--practice-line));transition:background var(--motion-fast),height var(--motion-fast)}.split-handle[data-astro-cid-zvf4qtfv]:hover>span[data-astro-cid-zvf4qtfv],.split-handle[data-astro-cid-zvf4qtfv]:focus-visible>span[data-astro-cid-zvf4qtfv]{height:4.6rem;background:var(--practice-accent);box-shadow:0 -.75rem var(--practice-accent),0 .75rem var(--practice-accent)}.transcript-panel[data-astro-cid-zvf4qtfv]{display:flex;max-height:34rem;min-width:0;flex-direction:column;align-self:start;border:1px solid var(--practice-line);background:var(--practice-panel);border-radius:.85rem;box-shadow:inset 0 1px 0 var(--practice-glass-highlight);backdrop-filter:blur(20px) saturate(135%);transition:background .36s ease,border-color .24s ease,box-shadow .36s ease}.transcript-header[data-astro-cid-zvf4qtfv]{display:flex;align-items:start;justify-content:space-between;gap:1rem;border-bottom:1px solid var(--practice-line);padding:.95rem 1rem .8rem}.transcript-header[data-astro-cid-zvf4qtfv] span[data-astro-cid-zvf4qtfv],.transcript-header[data-astro-cid-zvf4qtfv] strong[data-astro-cid-zvf4qtfv],.transcript-header[data-astro-cid-zvf4qtfv] i[data-astro-cid-zvf4qtfv]{display:block}.transcript-header[data-astro-cid-zvf4qtfv] span[data-astro-cid-zvf4qtfv]{color:var(--practice-accent);font-size:.64rem;letter-spacing:.09em}.transcript-header[data-astro-cid-zvf4qtfv] strong[data-astro-cid-zvf4qtfv]{margin-top:.32rem;color:var(--practice-text);font:.94rem var(--practice-chinese)}.transcript-header[data-astro-cid-zvf4qtfv]>div[data-astro-cid-zvf4qtfv]:last-child{text-align:right}.transcript-header[data-astro-cid-zvf4qtfv]>div[data-astro-cid-zvf4qtfv]:last-child span[data-astro-cid-zvf4qtfv]{color:var(--practice-muted)}.transcript-header[data-astro-cid-zvf4qtfv] i[data-astro-cid-zvf4qtfv]{margin-top:.32rem;color:var(--practice-muted);font:.62rem var(--font-mono-readable);font-style:normal;letter-spacing:.08em}.transcript-header[data-astro-cid-zvf4qtfv] i[data-astro-cid-zvf4qtfv].is-active{color:#83d7a0}.caption-list[data-astro-cid-zvf4qtfv]{display:flex;min-height:0;flex:1;flex-direction:column;gap:.25rem;margin:0;overflow-y:auto;padding:.65rem;list-style:none;overscroll-behavior:contain;scrollbar-color:color-mix(in srgb,var(--practice-accent) 65%,transparent) transparent;scrollbar-gutter:stable}.caption-list[data-astro-cid-zvf4qtfv]::-webkit-scrollbar{width:.45rem}.caption-list[data-astro-cid-zvf4qtfv]::-webkit-scrollbar-thumb{background:color-mix(in srgb,var(--practice-accent) 65%,transparent)}.caption-line[data-astro-cid-zvf4qtfv],.practice-preview-scope .caption-line{display:grid;grid-template-columns:3.4rem minmax(0,1fr) 2rem;gap:.6rem;width:100%;align-items:start;border:1px solid transparent;border-left:2px solid transparent;padding:.68rem .55rem;background:transparent;color:var(--practice-text);font:inherit;text-align:left}.practice-preview-scope .caption-line:hover{background:color-mix(in srgb,var(--practice-accent) 8%,transparent)}.practice-preview-scope .caption-line.is-current{border-color:color-mix(in srgb,var(--practice-accent) 36%,transparent);border-left-color:var(--practice-accent);background:color-mix(in srgb,var(--practice-accent) 13%,transparent)}.practice-preview-scope .caption-line time,.practice-preview-scope .cue-mark{color:var(--practice-muted);font-family:var(--font-mono-readable);font-size:.67rem}.practice-preview-scope .caption-line.is-current time,.practice-preview-scope .caption-line.is-current .cue-mark{color:var(--practice-accent)}.practice-preview-scope .caption-copy{min-width:0}.practice-preview-scope .caption-copy strong,.practice-preview-scope .caption-copy small{display:block}.practice-preview-scope .caption-copy strong{color:var(--practice-text);font-family:var(--practice-english);font-size:.98rem;font-weight:560;letter-spacing:-.012em;line-height:1.42}.practice-preview-scope .caption-copy small{margin-top:.3rem;color:var(--practice-muted);font-family:var(--practice-chinese);font-size:.8rem;font-weight:400;line-height:1.55}.practice-preview-scope .cue-mark{padding-top:.05rem;text-align:right}.caption-line[data-astro-cid-zvf4qtfv]:hover{background:color-mix(in srgb,var(--practice-accent) 8%,transparent)}.caption-line[data-astro-cid-zvf4qtfv].is-current{border-color:color-mix(in srgb,var(--practice-accent) 36%,transparent);border-left-color:var(--practice-accent);background:color-mix(in srgb,var(--practice-accent) 13%,transparent)}.caption-line[data-astro-cid-zvf4qtfv] time[data-astro-cid-zvf4qtfv],.cue-mark[data-astro-cid-zvf4qtfv]{color:var(--practice-muted);font-family:var(--font-mono-readable);font-size:.67rem}.caption-line[data-astro-cid-zvf4qtfv].is-current time[data-astro-cid-zvf4qtfv],.caption-line[data-astro-cid-zvf4qtfv].is-current .cue-mark[data-astro-cid-zvf4qtfv]{color:var(--practice-accent)}.caption-copy[data-astro-cid-zvf4qtfv] 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