:root{color-scheme:light;--color-workspace: #f1f0ed;--color-workspace-deep: #e9e7e2;--color-surface: #fffefa;--color-surface-soft: #f7f6f3;--color-surface-muted: #ecebe7;--color-hover: #f2f1ed;--color-text: #171716;--color-text-secondary: #6f6e69;--color-text-tertiary: #9a9891;--color-border: #e3e1dc;--color-border-strong: #d1cec6;--color-action: #1f4e79;--color-selected: #171716;--color-focus: rgba(31, 78, 121, .24);--color-success: #457253;--color-success-soft: #edf4ee;--color-danger: #a33b35;--color-danger-soft: #f8eeec;--color-info-soft: #eef3f8;--color-glow-blue: rgba(157, 202, 255, .34);--color-glow-violet: rgba(205, 188, 255, .22);--font-sans: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;--font-mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;--text-xs: .6875rem;--text-sm: .8125rem;--text-base: 1rem;--text-lg: 1.125rem;--text-xl: 1.5rem;--text-page: clamp(2rem, 4vw, 3.625rem);--text-slide: clamp(2rem, 4.4vw, 4.75rem);--text-hero: clamp(2.75rem, 6vw, 5.75rem);--space-1: .25rem;--space-2: .5rem;--space-3: .75rem;--space-4: 1rem;--space-5: 1.25rem;--space-6: 1.5rem;--space-8: 2rem;--space-10: 2.5rem;--space-12: 3rem;--space-16: 4rem;--radius-control: .75rem;--radius-card: 1.25rem;--radius-panel: 1.625rem;--radius-pill: 999px;--shadow-panel: 0 1px 2px rgba(23, 23, 22, .04), 0 12px 36px rgba(23, 23, 22, .05);--shadow-float: 0 12px 40px rgba(23, 23, 22, .13);--duration-fast: .14s;--duration-base: .22s;--ease-standard: cubic-bezier(.2, .7, .2, 1);--page-width: 77.5rem;--reading-width: 47.5rem;--header-height: 4.5rem}*,*:before,*:after{box-sizing:border-box}html{min-height:100%;background:var(--color-workspace);scroll-behavior:smooth}body{min-width:20rem;min-height:100vh;margin:0;background:var(--color-workspace);color:var(--color-text);font-family:var(--font-sans);font-size:var(--text-base);font-weight:430;line-height:1.65;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased}img,video,svg{display:block;max-width:100%}button,input,select,textarea{color:inherit;font:inherit}button,a{-webkit-tap-highlight-color:transparent}a{color:var(--color-action);text-underline-offset:.2em}:focus-visible{outline:3px solid var(--color-focus);outline-offset:3px}::selection{background:#9dcaff73}h1,h2,h3,p{margin-block-start:0}h1,h2,h3{line-height:1.12;letter-spacing:-.025em}.site-shell{min-height:100vh}.site-header{position:sticky;z-index:30;top:0;min-height:var(--header-height);border-bottom:1px solid rgba(227,225,220,.78);background:#f1f0ede0;backdrop-filter:blur(18px)}.site-header__inner{display:flex;width:min(calc(100% - 2rem),var(--page-width));min-height:var(--header-height);margin-inline:auto;align-items:center;justify-content:space-between;gap:var(--space-5)}.site-brand{display:inline-flex;flex:0 0 auto;align-items:center;gap:var(--space-2);color:var(--color-text);font-size:var(--text-sm);font-weight:650;letter-spacing:.01em;text-decoration:none}.site-brand__mark{width:auto;height:2rem;flex:0 0 auto}.site-nav{display:flex;max-width:100%;padding:var(--space-1);gap:var(--space-1);overflow-x:auto;border:1px solid var(--color-border);border-radius:var(--radius-pill);background:#fffefac7;scrollbar-width:none}.site-nav::-webkit-scrollbar{display:none}.nav-link{display:inline-flex;min-height:2.25rem;padding:.45rem .9rem;align-items:center;justify-content:center;flex:0 0 auto;border-radius:var(--radius-pill);color:var(--color-text-secondary);font-size:var(--text-sm);font-weight:570;line-height:1;text-decoration:none;transition:color var(--duration-fast),background var(--duration-fast)}.nav-link:hover{background:var(--color-hover);color:var(--color-text)}.nav-link[aria-current=page],.nav-link.is-active{background:var(--color-selected);color:#fff}.page-main{padding:clamp(2rem,5vw,4rem) 1rem 5rem}.page-container{width:min(100%,var(--page-width));margin-inline:auto}.page-container--narrow{width:min(100%,var(--reading-width))}.page-header{margin-bottom:clamp(2rem,5vw,4rem)}.page-eyebrow,.slide-kicker,.media-label,.tag{color:var(--color-text-secondary);font-size:var(--text-xs);font-weight:650;letter-spacing:.09em;line-height:1.2;text-transform:uppercase}.page-title{max-width:14ch;margin-bottom:var(--space-4);font-size:var(--text-page);font-weight:650}.page-lead{max-width:42rem;margin-bottom:0;color:var(--color-text-secondary);font-size:clamp(1.05rem,2vw,1.25rem)}.button,.icon-button{display:inline-flex;min-height:2.75rem;border:1px solid transparent;align-items:center;justify-content:center;gap:var(--space-2);border-radius:var(--radius-control);cursor:pointer;font-weight:570;text-decoration:none;transition:transform var(--duration-fast) var(--ease-standard),border-color var(--duration-fast),background var(--duration-fast),box-shadow var(--duration-fast)}.button{padding:.65rem 1rem;background:var(--color-selected);color:#fff}.button:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 8px 20px #1717161f}.button--secondary,.icon-button{border-color:var(--color-border);background:var(--color-surface);color:var(--color-text)}.button--quiet{background:transparent;color:var(--color-text-secondary)}.button:disabled,.icon-button:disabled{cursor:not-allowed;opacity:.42;transform:none;box-shadow:none}.icon-button{width:2.75rem;padding:0}.course-shell{min-height:100dvh;overflow:hidden;background:var(--color-workspace-deep)}.course-shell.is-presenting .site-header,.presentation-mode .site-header{display:none}.course-stage{position:relative;display:grid;min-height:100dvh;padding:clamp(.75rem,2vw,1.5rem);place-items:center}.course-slide{position:relative;width:min(calc(100vw - 3rem),calc((100dvh - 3rem) * 16 / 9));aspect-ratio:16 / 9;overflow:hidden;border:1px solid var(--color-border);border-radius:var(--radius-panel);background:var(--color-surface);box-shadow:var(--shadow-panel)}.slide-inner{display:flex;height:100%;padding:clamp(2.25rem,5vw,5rem);flex-direction:column;justify-content:center}.course-cover:before{position:absolute;top:-28%;right:-14%;width:58%;aspect-ratio:1;border-radius:50%;background:radial-gradient(circle at 35% 45%,var(--color-glow-blue),var(--color-glow-violet) 44%,transparent 72%);content:"";filter:blur(8px);pointer-events:none}.course-cover .slide-inner{position:relative;z-index:1;align-items:flex-start}.course-cover .slide-title{max-width:10ch;font-size:var(--text-hero)}.slide-title{max-width:15ch;margin:var(--space-3) 0 var(--space-6);font-size:var(--text-slide);font-weight:650}.slide-lead,.slide-body{max-width:45rem;color:var(--color-text-secondary);font-size:clamp(1rem,1.7vw,1.375rem);line-height:1.55}.slide-grid{display:grid;align-items:center;gap:clamp(1.5rem,4vw,4rem);grid-template-columns:minmax(0,.88fr) minmax(0,1.12fr)}.slide-grid>*{min-width:0}.presentation-chrome{position:fixed;z-index:40;inset:0;pointer-events:none}.lecture-timer,.slide-counter,.slide-controls{position:absolute;pointer-events:auto}.lecture-timer{top:max(1rem,env(safe-area-inset-top));right:max(1rem,env(safe-area-inset-right));display:flex;min-height:2.75rem;padding:.5rem .75rem;border:1px solid var(--color-border);align-items:center;gap:var(--space-2);border-radius:var(--radius-pill);background:#fffefae6;box-shadow:var(--shadow-panel);font-variant-numeric:tabular-nums;backdrop-filter:blur(12px)}.lecture-timer__value{font-family:var(--font-mono);font-size:var(--text-sm);font-weight:650}.lecture-timer__status{color:var(--color-text-secondary);font-size:var(--text-xs)}.slide-counter{bottom:max(1.25rem,env(safe-area-inset-bottom));left:max(1.25rem,env(safe-area-inset-left));color:var(--color-text-secondary);font-size:var(--text-sm);font-variant-numeric:tabular-nums}.slide-controls{bottom:max(1rem,env(safe-area-inset-bottom));left:50%;display:flex;padding:var(--space-1);gap:var(--space-1);border:1px solid var(--color-border);border-radius:var(--radius-pill);background:#fffefaeb;box-shadow:var(--shadow-float);transform:translate(-50%);backdrop-filter:blur(12px)}.slide-progress{position:fixed;z-index:45;bottom:0;left:0;width:100%;height:.1875rem;overflow:hidden;background:#d1cec68c}.slide-progress__value{width:var(--progress, 0%);height:100%;background:var(--color-action);transition:width var(--duration-base) var(--ease-standard)}.media-frame{position:relative;overflow:hidden;border:1px solid var(--color-border);border-radius:var(--radius-card);background:#222}.media-frame--landscape{aspect-ratio:16 / 9}.media-frame--portrait{aspect-ratio:3 / 4}.media-frame img,.media-frame video{width:100%;height:100%;object-fit:contain}.media-frame[data-fit=cover] img,.media-frame[data-fit=cover] video{object-fit:cover}.media-label{position:absolute;z-index:2;top:var(--space-3);left:var(--space-3);padding:.4rem .6rem;border-radius:var(--radius-pill);background:#171716b8;color:#fff;backdrop-filter:blur(8px)}.media-placeholder{display:grid;min-height:12rem;padding:var(--space-6);place-items:center;color:#ffffffb8;text-align:center}.reference-grid,.case-media-grid{display:grid;gap:var(--space-4);grid-template-columns:repeat(2,minmax(0,1fr))}.prompt-block{overflow:hidden;border:1px solid var(--color-border);border-radius:var(--radius-card);background:var(--color-surface-soft)}.prompt-block__header{display:flex;min-height:3rem;padding:var(--space-2) var(--space-4);border-bottom:1px solid var(--color-border);align-items:center;justify-content:space-between;gap:var(--space-3)}.prompt-block pre{margin:0;padding:var(--space-5);overflow-wrap:anywhere;color:var(--color-text);font-family:var(--font-mono);font-size:var(--text-sm);line-height:1.65;white-space:pre-wrap}.wiki-index{display:grid;gap:var(--space-10)}.wiki-category{padding-top:var(--space-6);border-top:1px solid var(--color-border-strong)}.wiki-category__title{margin-bottom:var(--space-5);font-size:var(--text-xl)}.wiki-list{margin:0;padding:0;list-style:none}.wiki-entry{display:grid;padding:var(--space-4) 0;border-bottom:1px solid var(--color-border);gap:var(--space-2);color:var(--color-text);text-decoration:none}.wiki-entry:hover .wiki-entry__title{color:var(--color-action)}.wiki-entry__title{font-weight:650;transition:color var(--duration-fast)}.wiki-entry__summary{margin:0;color:var(--color-text-secondary);font-size:var(--text-sm)}.prose{width:min(100%,var(--reading-width));font-size:1.0625rem;line-height:1.8}.prose h2{margin:2.75em 0 .75em;font-size:1.75rem}.prose h3{margin:2em 0 .6em;font-size:1.25rem}.prose p,.prose ul,.prose ol{margin-bottom:1.25em}.prose img,.prose video{margin-block:2rem;border-radius:var(--radius-card)}.related-content{margin-top:var(--space-12);padding:var(--space-6);border:1px solid var(--color-border);border-radius:var(--radius-card);background:var(--color-surface-soft)}.case-grid{display:grid;gap:var(--space-6);grid-template-columns:repeat(3,minmax(0,1fr))}.case-card{overflow:hidden;border:1px solid var(--color-border);border-radius:var(--radius-card);background:var(--color-surface);box-shadow:0 1px 2px #17171608;color:var(--color-text);text-decoration:none;transition:transform var(--duration-base) var(--ease-standard),border-color var(--duration-fast),box-shadow var(--duration-base)}.case-card:hover{border-color:var(--color-border-strong);box-shadow:var(--shadow-panel);transform:translateY(-2px)}.case-card__cover{aspect-ratio:16 / 10;overflow:hidden;background:var(--color-surface-muted)}.case-card__cover img{width:100%;height:100%;object-fit:cover}.case-card__body{padding:var(--space-5)}.case-card__title{margin-bottom:var(--space-2);font-size:1.125rem}.case-card__summary{margin-bottom:var(--space-4);color:var(--color-text-secondary);font-size:var(--text-sm)}.tag-list{display:flex;flex-wrap:wrap;gap:var(--space-2)}.tag{padding:.35rem .55rem;border:1px solid var(--color-border);border-radius:var(--radius-pill);background:var(--color-surface-soft);letter-spacing:.04em;text-transform:none}.case-detail{display:grid;gap:var(--space-12)}.case-hero{display:grid;align-items:center;gap:clamp(1.5rem,4vw,4rem);grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr)}.quiz-shell{width:min(100%,var(--reading-width));margin-inline:auto;padding:clamp(1.25rem,4vw,2.5rem);border:1px solid var(--color-border);border-radius:var(--radius-panel);background:var(--color-surface);box-shadow:var(--shadow-panel)}.quiz-topline{display:flex;margin-bottom:var(--space-8);align-items:center;justify-content:space-between;gap:var(--space-4);color:var(--color-text-secondary);font-size:var(--text-sm);font-variant-numeric:tabular-nums}.quiz-progress{height:.35rem;margin-bottom:var(--space-8);overflow:hidden;border-radius:var(--radius-pill);background:var(--color-surface-muted)}.quiz-progress__value{width:var(--progress, 0%);height:100%;border-radius:inherit;background:var(--color-action);transition:width var(--duration-base) var(--ease-standard)}.question-title{margin-bottom:var(--space-6);font-size:clamp(1.35rem,3vw,2rem);line-height:1.35}.answer-list{display:grid;margin:0;padding:0;gap:var(--space-3);border:0}.answer-option{display:grid;min-height:3.5rem;padding:var(--space-4);border:1px solid var(--color-border);align-items:center;gap:var(--space-3);grid-template-columns:1.25rem 1fr;border-radius:var(--radius-control);background:var(--color-surface);cursor:pointer;transition:border-color var(--duration-fast),background var(--duration-fast),box-shadow var(--duration-fast)}.answer-option:hover:not(.is-locked){border-color:var(--color-border-strong);background:var(--color-hover)}.answer-option.is-selected{border-color:var(--color-action);box-shadow:0 0 0 3px var(--color-focus)}.answer-option.is-correct{border-color:var(--color-success);background:var(--color-success-soft)}.answer-option.is-incorrect{border-color:var(--color-danger);background:var(--color-danger-soft)}.answer-option.is-locked{cursor:default}.answer-marker{display:grid;width:1.25rem;height:1.25rem;border:1px solid var(--color-border-strong);place-items:center;border-radius:50%;background:var(--color-surface)}.is-selected .answer-marker{border:.35rem solid var(--color-action)}.quiz-feedback,.notice,.empty-state{margin-top:var(--space-6);padding:var(--space-5);border:1px solid var(--color-border);border-radius:var(--radius-card);background:var(--color-surface-soft)}.quiz-feedback--correct,.notice--success{border-color:#45725357;background:var(--color-success-soft)}.quiz-feedback--incorrect,.notice--danger{border-color:#a33b354d;background:var(--color-danger-soft)}.quiz-actions{display:flex;margin-top:var(--space-6);flex-wrap:wrap;justify-content:flex-end;gap:var(--space-3)}.quiz-result{text-align:center}.quiz-result__score{margin:var(--space-5) 0;font-size:var(--text-page);font-weight:650;font-variant-numeric:tabular-nums}.empty-state{display:grid;min-height:16rem;place-content:center;text-align:center}.toast{position:fixed;z-index:80;right:max(1rem,env(safe-area-inset-right));bottom:max(1rem,env(safe-area-inset-bottom));max-width:min(24rem,calc(100vw - 2rem));padding:.8rem 1rem;border:1px solid var(--color-border);border-radius:var(--radius-control);background:var(--color-selected);box-shadow:var(--shadow-float);color:#fff;font-size:var(--text-sm)}.stack{display:flex;flex-direction:column;gap:var(--stack-space, var(--space-4))}.cluster{display:flex;flex-wrap:wrap;align-items:center;gap:var(--cluster-space, var(--space-3))}.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}@media(max-width:61.25rem){.case-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.case-hero,.slide-grid{gap:var(--space-8);grid-template-columns:1fr}.course-slide{width:calc(100vw - 2rem)}}@media(max-width:45rem){:root{--header-height: 4rem}.site-header__inner{width:100%;padding-left:1rem;gap:var(--space-3)}.site-brand__text{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;border:0;clip:rect(0 0 0 0);white-space:nowrap}.site-nav{border-right:0;border-radius:var(--radius-pill) 0 0 var(--radius-pill)}.page-main{padding:var(--space-8) 1rem var(--space-16)}.case-grid,.reference-grid,.case-media-grid{grid-template-columns:1fr}.course-stage{display:block;min-height:100dvh;padding:0}.course-slide{width:100%;min-height:100dvh;aspect-ratio:auto;overflow-y:auto;border:0;border-radius:0}.slide-inner{min-height:100dvh;padding:5.5rem 1.25rem 6.5rem;justify-content:flex-start}.course-cover .slide-inner{justify-content:center}.slide-title{font-size:clamp(2rem,11vw,3.5rem)}.course-cover .slide-title{font-size:clamp(2.75rem,14vw,4.75rem)}.lecture-timer{top:max(.75rem,env(safe-area-inset-top));right:.75rem}.lecture-timer__status{display:none}.slide-counter{bottom:max(1.25rem,env(safe-area-inset-bottom));left:.75rem}.slide-controls{bottom:max(.75rem,env(safe-area-inset-bottom))}.quiz-shell{padding:var(--space-5);border-radius:var(--radius-card)}.quiz-actions .button{width:100%}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}@media print{.site-header,.presentation-chrome,.button,.icon-button,.toast{display:none!important}body,.page-main{background:#fff}.page-main{padding:0}}