:root{--canvas: #F8F9FA;--surface: #FFFFFF;--surface-subtle: #F1F3F5;--text-main: #0F172A;--text-body: #334155;--text-muted: #64748B;--accent-primary: #0F172A;--accent-hover: #1E293B;--accent-text: #FFFFFF;--border-default: #E2E8F0;--border-hover: #94A3B8;--radius-sm: 6px;--radius-md: 8px}[data-astro-cid-2t2vcjtp]{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,PingFang SC,Segoe UI,Roboto,sans-serif;background-color:var(--canvas);color:var(--text-body);line-height:1.65;-webkit-font-smoothing:antialiased}.page-wrap[data-astro-cid-2t2vcjtp]{width:min(1040px,calc(100vw - 48px));margin:0 auto;padding:24px 0 96px}.site-nav[data-astro-cid-2t2vcjtp]{display:flex;align-items:center;justify-content:space-between;padding:16px 0;border-bottom:1px solid 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14px;cursor:pointer;text-align:left;font-family:inherit;transition:all .16s ease;display:flex;flex-direction:column;gap:3px;color:var(--text-muted);outline:none}.course-tab-btn[data-astro-cid-2t2vcjtp]:hover{background:#ffffffb3;color:var(--text-main)}.course-tab-btn[data-astro-cid-2t2vcjtp].is-active{background:#fff;border-color:#e2e8f0e6;color:var(--text-main);box-shadow:0 1px 3px #0f172a0f,0 1px 2px #0f172a0a}.tab-top-row[data-astro-cid-2t2vcjtp]{display:flex;align-items:center;justify-content:space-between}.tab-num[data-astro-cid-2t2vcjtp]{font-size:11px;font-weight:700;color:var(--text-muted);letter-spacing:.03em;font-family:ui-monospace,monospace}.course-tab-btn[data-astro-cid-2t2vcjtp].is-active .tab-num[data-astro-cid-2t2vcjtp]{color:var(--text-main)}.tab-pages[data-astro-cid-2t2vcjtp]{font-size:11px;color:var(--text-muted);font-weight:500}.tab-title[data-astro-cid-2t2vcjtp]{font-size:13.5px;font-weight:600;color:var(--text-body);line-height:1.35;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.course-tab-btn[data-astro-cid-2t2vcjtp].is-active .tab-title[data-astro-cid-2t2vcjtp]{color:var(--text-main);font-weight:700}.tab-target[data-astro-cid-2t2vcjtp]{font-size:11.5px;color:var(--text-muted);line-height:1.3;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.ppt-viewer-card[data-astro-cid-2t2vcjtp]{background:var(--surface);border:1px solid var(--border-default);border-radius:12px;overflow:hidden;box-shadow:0 8px 30px -10px #0f172a14;margin-bottom:24px}.viewer-header[data-astro-cid-2t2vcjtp]{display:flex;align-items:center;justify-content:space-between;padding:12px 18px;background:#f8f9fa;border-bottom:1px solid 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ease;font-family:inherit}.arrow-btn[data-astro-cid-2t2vcjtp]:hover:not(:disabled){background:var(--surface-subtle);border-color:var(--border-hover)}.arrow-btn[data-astro-cid-2t2vcjtp]:disabled{opacity:.3;cursor:not-allowed}.dots-nav[data-astro-cid-2t2vcjtp]{display:flex;align-items:center;gap:6px}.dot-item[data-astro-cid-2t2vcjtp]{width:7px;height:7px;border-radius:50%;background:var(--border-default);cursor:pointer;transition:all .15s ease}.dot-item[data-astro-cid-2t2vcjtp].is-active{background:var(--text-main);transform:scale(1.3)}.toolbar-right[data-astro-cid-2t2vcjtp]{display:flex;align-items:center;gap:10px}.btn-outline-sm[data-astro-cid-2t2vcjtp]{background:transparent;border:1px solid var(--border-default);color:var(--text-main);padding:7px 12px;border-radius:var(--radius-sm);font-size:12px;font-weight:600;cursor:pointer;font-family:inherit;display:inline-flex;align-items:center;gap:6px;transition:all .15s ease}.btn-outline-sm[data-astro-cid-2t2vcjtp]:hover{background:var(--surface-subtle);border-color:var(--border-hover)}.btn-solid-sm[data-astro-cid-2t2vcjtp]{background:var(--accent-primary);color:var(--accent-text);padding:7px 14px;border-radius:var(--radius-sm);font-size:12px;font-weight:600;cursor:pointer;font-family:inherit;display:inline-flex;align-items:center;gap:6px;border:none;transition:background-color .15s ease}.btn-solid-sm[data-astro-cid-2t2vcjtp]:hover{background:var(--accent-hover)}.drawer-overlay[data-astro-cid-2t2vcjtp]{position:absolute;top:48px;right:0;bottom:53px;width:320px;background:#fff;border-left:1px solid var(--border-default);box-shadow:-10px 0 30px #00000014;z-index:50;padding:16px;display:flex;flex-direction:column;transform:translate(100%);transition:transform .22s cubic-bezier(.16,1,.3,1);overflow-y:auto}.drawer-overlay[data-astro-cid-2t2vcjtp].is-open{transform:translate(0)}.drawer-title-row[data-astro-cid-2t2vcjtp]{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px;padding-bottom:8px;border-bottom:1px solid var(--border-default)}.drawer-title-row[data-astro-cid-2t2vcjtp] h4[data-astro-cid-2t2vcjtp]{font-size:13px;font-weight:700;color:var(--text-main)}.drawer-close-btn[data-astro-cid-2t2vcjtp]{background:none;border:none;color:var(--text-muted);font-size:16px;cursor:pointer}.drawer-items-list[data-astro-cid-2t2vcjtp]{display:flex;flex-direction:column;gap:6px}.drawer-item-btn[data-astro-cid-2t2vcjtp]{background:var(--surface);border:1px solid var(--border-default);border-radius:var(--radius-sm);padding:8px 10px;font-size:12px;color:var(--text-body);cursor:pointer;display:flex;align-items:center;gap:8px;text-align:left;transition:all .15s ease;font-family:inherit;width:100%}.drawer-item-btn[data-astro-cid-2t2vcjtp]:hover{background:var(--surface-subtle);color:var(--text-main)}.drawer-item-btn[data-astro-cid-2t2vcjtp].is-active{border-color:var(--text-main);background:var(--surface-subtle);color:var(--text-main);font-weight:600}.drawer-item-idx[data-astro-cid-2t2vcjtp]{font-family:ui-monospace,monospace;font-weight:700;color:var(--text-main);min-width:20px}.ip-notice-box[data-astro-cid-2t2vcjtp]{background:#fff;border:1px solid var(--border-default);border-left:3px solid var(--text-main);border-radius:0 var(--radius-md) var(--radius-md) 0;padding:16px 20px;margin-bottom:40px;display:flex;align-items:flex-start;gap:12px}.ip-notice-icon[data-astro-cid-2t2vcjtp]{font-size:18px;line-height:1.2}.ip-notice-text[data-astro-cid-2t2vcjtp]{font-size:13px;color:var(--text-body);line-height:1.6}.ip-notice-text[data-astro-cid-2t2vcjtp] strong[data-astro-cid-2t2vcjtp]{color:var(--text-main)}.features-row[data-astro-cid-2t2vcjtp]{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:48px}.feature-card[data-astro-cid-2t2vcjtp]{background:var(--surface);border:1px solid var(--border-default);border-radius:var(--radius-md);padding:24px 20px}.feature-card[data-astro-cid-2t2vcjtp] h4[data-astro-cid-2t2vcjtp]{font-size:15px;font-weight:700;color:var(--text-main);margin-bottom:8px}.feature-card[data-astro-cid-2t2vcjtp] p[data-astro-cid-2t2vcjtp]{font-size:13px;color:var(--text-body);line-height:1.6;margin:0}.bottom-cta-card[data-astro-cid-2t2vcjtp]{background:var(--surface);border:1px solid var(--border-default);border-radius:12px;padding:32px 36px;display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap}.bottom-cta-text[data-astro-cid-2t2vcjtp] h3[data-astro-cid-2t2vcjtp]{font-size:20px;font-weight:700;color:var(--text-main);margin-bottom:6px}.bottom-cta-text[data-astro-cid-2t2vcjtp] p[data-astro-cid-2t2vcjtp]{font-size:14px;color:var(--text-muted);margin:0;max-width:600px}.bottom-cta-actions[data-astro-cid-2t2vcjtp]{display:flex;align-items:center;gap:12px}.site-footer[data-astro-cid-2t2vcjtp]{padding-top:40px;border-top:1px solid var(--border-default);display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--text-muted);margin-top:64px}.footer-nav[data-astro-cid-2t2vcjtp]{display:flex;align-items:center;gap:20px}.footer-nav[data-astro-cid-2t2vcjtp] a[data-astro-cid-2t2vcjtp]{color:var(--text-muted);text-decoration:none;transition:color .15s ease}.footer-nav[data-astro-cid-2t2vcjtp] a[data-astro-cid-2t2vcjtp]:hover{color:var(--text-main)}@media (max-width: 860px){.course-nav-bar[data-astro-cid-2t2vcjtp],.course-selector-grid[data-astro-cid-2t2vcjtp],.features-row[data-astro-cid-2t2vcjtp]{grid-template-columns:1fr}.site-nav[data-astro-cid-2t2vcjtp]{flex-direction:column;align-items:flex-start;gap:16px}.nav-menu[data-astro-cid-2t2vcjtp]{flex-wrap:wrap;gap:16px}.bottom-cta-card[data-astro-cid-2t2vcjtp]{padding:24px}}