:root{color-scheme:light;--bg: #faf9f6;--surface: #ffffff;--panel: #f6f3ec;--border: #e8e4dc;--border-strong: #d5cfc3;--text: #21201d;--text-soft: #4a473f;--text-muted: #6e6a61;--accent: #0f6e6e;--accent-hover: #0a5757;--accent-soft: #e3f2f1;--accent-tint: #f0f8f7;--accent-line: #a6d5d3;--success: #2f7d4f;--success-bg: #eaf4ee;--success-border: #c8e0d1;--danger: #a03530;--danger-bg: #f9edeb;--danger-border: #ddb1ac;--notice-bg: #fdf6e3;--notice-border: #e6d9ac;--notice-text: #6b5300;--radius-sm: 8px;--radius-md: 10px;--radius-lg: 14px;--radius-xl: 18px;--shadow-xs: 0 1px 2px rgba(34, 33, 30, .05);--shadow-sm: 0 1px 3px rgba(34, 33, 30, .05), 0 4px 14px rgba(34, 33, 30, .05);--shadow-md: 0 2px 6px rgba(34, 33, 30, .05), 0 12px 32px rgba(34, 33, 30, .09);--shadow-accent: inset 0 1px 0 rgba(255, 255, 255, .14), 0 1px 2px rgba(15, 110, 110, .28);--ease-out: cubic-bezier(.22, 1, .36, 1);--ease-spring: cubic-bezier(.34, 1.45, .64, 1);--font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-serif: "Iowan Old Style", Charter, "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-ui);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}a{color:var(--accent);text-decoration:none}button{font:inherit}h1,h2,h3{text-wrap:balance}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}::selection{background:#cfe9e7}.visually-hidden{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}@keyframes rise-in{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}@keyframes fade-in{0%{opacity:0}to{opacity:1}}@keyframes fade-down{0%{opacity:0;transform:translateY(-5px)}to{opacity:1;transform:translateY(0)}}@keyframes pop-in{0%{opacity:0;transform:scale(.55)}70%{transform:scale(1.1)}to{opacity:1;transform:scale(1)}}@keyframes spin{to{transform:rotate(360deg)}}.fade-in{animation:fade-in .26s var(--ease-out) both}.btn{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:9px 18px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--surface);color:var(--text);font-size:.95rem;font-weight:500;line-height:1.45;cursor:pointer;transition:background-color .14s ease,border-color .14s ease,color .14s ease,box-shadow .14s ease,transform .1s ease}.btn:hover:not(:disabled){border-color:#c3bcae;background:#fdfcfa;box-shadow:var(--shadow-xs)}.btn:active:not(:disabled){transform:translateY(1px);box-shadow:none}.btn:disabled{color:var(--text-muted);background:var(--panel);border-color:var(--border);cursor:not-allowed}.btn-primary{background:var(--accent);border-color:var(--accent);color:#fff;box-shadow:var(--shadow-accent)}.btn-primary:hover:not(:disabled){background:var(--accent-hover);border-color:var(--accent-hover);box-shadow:inset 0 1px #ffffff24,0 2px 6px #0f6e6e4d}.btn-success{background:var(--success-bg);border-color:var(--success);color:var(--success)}.btn-success:hover:not(:disabled){background:#e0efe6;border-color:var(--success);box-shadow:none}.btn-ghost{border-color:transparent;background:transparent;color:var(--text-muted);box-shadow:none}.btn-ghost:hover:not(:disabled){color:var(--text);background:var(--panel);border-color:transparent;box-shadow:none}.btn-block{width:100%}.btn-spinner{width:14px;height:14px;flex-shrink:0;border-radius:50%;border:2px solid color-mix(in srgb,currentColor 30%,transparent);border-top-color:currentColor;animation:spin .7s linear infinite}.lang-toggle{display:inline-flex;gap:2px;padding:2px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--panel)}.lang-btn{padding:4px 11px;border:none;border-radius:6px;background:transparent;color:var(--text-muted);font-size:.8rem;font-weight:600;letter-spacing:.05em;cursor:pointer;transition:background-color .14s ease,color .14s ease,box-shadow .14s ease}.lang-btn.active{background:var(--surface);color:var(--accent);box-shadow:var(--shadow-xs)}.lang-btn:not(.active):hover{color:var(--text)}.topbar{position:sticky;top:0;z-index:40;background:var(--surface);border-bottom:1px solid var(--border)}@supports (backdrop-filter: blur(1px)) or (-webkit-backdrop-filter: blur(1px)){.topbar{background:color-mix(in srgb,var(--surface) 86%,transparent);-webkit-backdrop-filter:blur(10px) saturate(1.5);backdrop-filter:blur(10px) saturate(1.5)}}.topbar-inner{max-width:1120px;margin:0 auto;padding:0 24px;height:60px;display:flex;align-items:center;justify-content:space-between;gap:16px}.brand{display:inline-flex;align-items:center;gap:10px;min-width:0;font-family:var(--font-serif);font-size:1.15rem;font-weight:600;color:var(--text);letter-spacing:.01em}.brand-mark{flex-shrink:0;display:block;filter:drop-shadow(0 1px 1.5px rgba(15,110,110,.3))}.brand-name{overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.topbar-right{display:flex;align-items:center;gap:14px;flex-shrink:0}.topbar-user{color:var(--text-muted);font-size:.92rem;max-width:16ch;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}.reading-progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:60;pointer-events:none}.reading-progress-fill{height:100%;background:var(--accent);transform-origin:0 50%}.page{max-width:1120px;margin:0 auto;padding:36px 24px 72px;animation:rise-in .32s var(--ease-out) both}.page-header{margin:4px 0 28px}.page-header h1{font-family:var(--font-serif);font-size:clamp(1.65rem,1.35rem + 1.5vw,2.05rem);font-weight:600;letter-spacing:-.015em;line-height:1.2;margin:0 0 6px}.page-subtitle{color:var(--text-muted);margin:0}.back-link{display:inline-flex;align-items:center;gap:6px;color:var(--text-muted);font-size:.92rem;margin-bottom:10px;transition:color .14s ease}.back-link:hover{color:var(--accent)}.back-link-arrow{display:inline-block;transition:transform .18s var(--ease-out)}.back-link:hover .back-link-arrow{transform:translate(-3px)}.empty-state{max-width:420px;margin:72px auto;text-align:center}.empty-note{font-family:var(--font-serif);font-size:1.15rem;color:var(--text-muted);margin:0 0 20px}.boot-screen{min-height:100dvh;display:grid;place-items:center}.sk{position:relative;display:block;overflow:hidden;background:#eeeae1;border-radius:6px}.sk:after{content:"";position:absolute;top:0;right:0;bottom:0;left:0;transform:translate(-100%);background:linear-gradient(90deg,transparent,rgba(255,255,255,.6),transparent);animation:shimmer 1.6s ease infinite}@keyframes shimmer{to{transform:translate(100%)}}.sk-line{height:13px}.sk-thin{height:10px}.sk-title{height:26px;border-radius:7px;margin:2px 0 26px}.sk-num{width:26px;height:26px;flex-shrink:0;border-radius:8px}.sk-bar{height:6px;border-radius:999px;margin-top:18px}.sk-row{height:18px;margin:14px}.detail-skeleton .sk-eyebrow{height:10px;width:76px;margin:34px 0 10px}.lesson-skeleton .sk-para{height:12px;margin-bottom:11px}.topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px}@media(max-width:680px){.topic-grid{grid-template-columns:1fr}}.topic-card{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:22px 24px 18px;color:var(--text);box-shadow:var(--shadow-xs);animation:rise-in .38s var(--ease-out) backwards;transition:border-color .16s ease,box-shadow .16s ease,transform .16s var(--ease-out)}.topic-card:hover{border-color:var(--accent-line);box-shadow:var(--shadow-md);transform:translateY(-2px)}.topic-card:active{transform:translateY(0);box-shadow:var(--shadow-xs)}.topic-card-head{display:flex;align-items:flex-start;gap:12px;margin-bottom:16px}.topic-num{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;margin-top:1px;border-radius:8px;background:var(--panel);font-family:var(--font-serif);font-size:.88rem;font-weight:600;color:var(--text-muted);font-variant-numeric:tabular-nums;transition:background-color .16s ease,color .16s ease}.topic-card:hover .topic-num{background:var(--accent-soft);color:var(--accent)}.topic-name{flex:1;font-family:var(--font-serif);font-size:1.18rem;font-weight:600;line-height:1.35;margin:0}.topic-card-arrow{flex-shrink:0;margin-top:3px;color:var(--accent);opacity:0;transform:translate(-5px);transition:opacity .16s ease,transform .18s var(--ease-out)}.topic-card:hover .topic-card-arrow{opacity:1;transform:translate(0)}.topic-card-foot{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-top:10px}.topic-count{color:var(--text-muted);font-size:.88rem;margin:0}.topic-pct{color:var(--text-muted);font-size:.82rem;font-weight:600;font-variant-numeric:tabular-nums}.topic-pct.done{color:var(--success)}.topic-card.is-skeleton{pointer-events:none;animation:none;box-shadow:none}.progress{height:6px;border-radius:999px;background:#edeade;overflow:hidden}.progress-fill{height:100%;background:var(--accent);border-radius:999px;transition:width .45s var(--ease-out)}.progress.done .progress-fill{background:var(--success)}.module-list{display:flex;flex-direction:column;gap:34px;max-width:860px}.module-header{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;padding-bottom:10px;border-bottom:1px solid var(--border);margin-bottom:6px}.module-eyebrow{margin:0 0 2px;font-size:.75rem;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--accent)}.module-name{font-family:var(--font-serif);font-size:1.3rem;font-weight:600;margin:0}.module-count{flex-shrink:0;padding:3px 11px;margin-bottom:3px;border-radius:999px;border:1px solid var(--border);background:var(--panel);color:var(--text-muted);font-size:.8rem;font-weight:500;font-variant-numeric:tabular-nums;white-space:nowrap;transition:background-color .2s ease,border-color .2s ease,color .2s ease}.module-count.done{background:var(--success-bg);border-color:var(--success-border);color:var(--success);font-weight:600}.lesson-list{list-style:none;margin:0;padding:0}.lesson-row{display:flex;align-items:center;gap:14px;padding:11px 14px;border-radius:var(--radius-sm);color:var(--text);transition:background-color .14s ease,transform .18s var(--ease-out)}.lesson-row:hover{background:var(--panel);transform:translate(3px)}.lesson-num{color:var(--text-muted);font-size:.88rem;font-variant-numeric:tabular-nums;min-width:1.6em;text-align:right;transition:color .14s ease}.lesson-row:hover .lesson-num{color:var(--accent)}.lesson-title{flex:1}.check{flex-shrink:0}.check .check-circle{fill:transparent;stroke:var(--border-strong);stroke-width:1.4;transition:fill .2s ease,stroke .2s ease}.check .check-mark{stroke:transparent;stroke-dasharray:12;stroke-dashoffset:12;transition:stroke .12s ease,stroke-dashoffset .24s var(--ease-out) 60ms}.check.done .check-circle{fill:var(--success);stroke:var(--success)}.check.done .check-mark{stroke:#fff;stroke-dashoffset:0}.lesson-article,.lesson-skeleton{max-width:740px;margin:0 auto}.lesson-heading{font-family:var(--font-serif);font-size:clamp(1.7rem,1.35rem + 1.8vw,2.2rem);font-weight:600;letter-spacing:-.015em;line-height:1.22;margin:6px 0 22px}.fallback-notice{background:var(--notice-bg);border:1px solid var(--notice-border);color:var(--notice-text);border-radius:var(--radius-sm);padding:10px 14px;font-size:.92rem;margin:0 0 22px}.key-terms{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-lg);padding:20px 24px 8px;margin-bottom:34px}.key-terms-heading{font-size:.78rem;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--accent);margin:0 0 14px}.key-terms dl{margin:0}.key-term{padding:10px 0 12px}.key-term+.key-term{border-top:1px solid var(--border)}.key-term dt{font-weight:600;margin-bottom:3px}.key-term dd{margin:0;color:var(--text-soft);font-size:.95rem}.key-term dd p{margin:0}.lesson-body{font-family:var(--font-serif);font-size:1.0625rem;line-height:1.75}.lesson-body h2{font-size:1.45rem;font-weight:600;letter-spacing:-.01em;line-height:1.3;margin:2em 0 .7em}.lesson-body h3{font-size:1.2rem;font-weight:600;margin:1.7em 0 .6em}.lesson-body h4{font-size:1.05rem;font-weight:600;margin:1.5em 0 .5em}.lesson-body>h2:first-child,.lesson-body>h3:first-child{margin-top:.4em}.lesson-body p{margin:0 0 1em}.lesson-body a{text-decoration:underline;text-decoration-color:var(--accent-line);text-underline-offset:3px;transition:text-decoration-color .14s ease}.lesson-body a:hover{text-decoration-color:var(--accent)}.lesson-body ul,.lesson-body ol{margin:0 0 1em;padding-left:1.5em}.lesson-body li{margin-bottom:.4em}.lesson-body li::marker{color:var(--accent)}.lesson-body strong{font-weight:650}.lesson-body blockquote{margin:1.2em 0;padding:2px 0 2px 18px;border-left:3px solid var(--accent-line);color:var(--text-soft)}.lesson-body code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.85em;background:var(--panel);border-radius:4px;padding:1px 5px}.lesson-body pre{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px;overflow-x:auto}.lesson-body pre code{background:none;padding:0}.lesson-body hr{border:none;border-top:1px solid var(--border);margin:2em 0}.table-wrap{overflow-x:auto;margin:1.4em 0;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--surface)}.lesson-body table{border-collapse:collapse;width:100%;font-family:var(--font-ui);font-size:.88rem;line-height:1.45}.lesson-body th,.lesson-body td{padding:9px 14px;text-align:left;vertical-align:top}.lesson-body th{background:var(--accent-tint);border-bottom:2px solid var(--accent-line);font-weight:600}.lesson-body td{border-bottom:1px solid var(--border)}.lesson-body tbody tr:nth-child(2n){background:#fcfbf8}.lesson-body tbody tr:last-child td{border-bottom:none}.katex{font-size:1.06em}.katex-display{margin:1.3em 0;overflow-x:auto;overflow-y:hidden;padding:12px 16px;background:color-mix(in srgb,var(--accent) 3%,transparent);border-radius:var(--radius-sm)}.lesson-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin:44px 0 0;padding-top:28px;border-top:1px solid var(--border)}.btn-check{width:18px;height:18px}.btn-check.done{animation:pop-in .3s var(--ease-spring)}.lesson-nav{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:34px}.lesson-nav-card{display:flex;flex-direction:column;gap:4px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-md);padding:14px 16px;color:var(--text);transition:border-color .16s ease,box-shadow .16s ease,transform .16s var(--ease-out)}.lesson-nav-card:hover{border-color:var(--accent-line);box-shadow:var(--shadow-sm);transform:translateY(-1px)}.lesson-nav-card.next{text-align:right}.lesson-nav-label{color:var(--text-muted);font-size:.8rem;font-weight:600;letter-spacing:.03em;text-transform:uppercase;transition:color .14s ease}.lesson-nav-card:hover .lesson-nav-label{color:var(--accent)}.lesson-nav-title{font-size:.95rem;line-height:1.4}.login-screen{min-height:100vh;min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:24px;position:relative;background:radial-gradient(58rem 32rem at 50% -14rem,rgba(15,110,110,.08),transparent 62%),var(--bg)}.login-lang{position:absolute;top:20px;right:24px}.login-card{width:100%;max-width:400px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-xl);padding:40px 36px 32px;box-shadow:var(--shadow-md);animation:rise-in .42s var(--ease-out) both}.login-mark{display:flex;justify-content:center;margin-bottom:16px}.login-mark .brand-mark{filter:drop-shadow(0 2px 4px rgba(15,110,110,.28))}.login-brand{font-family:var(--font-serif);font-size:1.45rem;font-weight:600;letter-spacing:-.01em;text-align:center;margin:0 0 6px}.login-subtitle{color:var(--text-muted);text-align:center;margin:0 0 28px;font-size:.95rem}.field{display:block;margin-bottom:16px;text-align:left}.field-label{display:block;font-size:.85rem;font-weight:600;color:var(--text-muted);margin-bottom:6px}.field input{width:100%;padding:10px 12px;border:1px solid var(--border-strong);border-radius:var(--radius-sm);background:var(--surface);color:var(--text);font:inherit;transition:border-color .14s ease,box-shadow .14s ease}.field input:hover:not(:focus){border-color:#c3bcae}.field input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}.login-card .btn-block{margin-top:8px}.login-footer{margin:24px 0 0;padding-top:20px;border-top:1px solid var(--border);text-align:center;color:var(--text-muted);font-size:.92rem}.login-footer a{font-weight:500}.login-footer a:hover{text-decoration:underline;text-underline-offset:3px}.form-error{background:var(--danger-bg);border:1px solid var(--danger-border);border-radius:var(--radius-sm);color:var(--danger);font-size:.9rem;line-height:1.45;padding:10px 13px;margin:0 0 16px;text-align:left;animation:fade-down .22s var(--ease-out)}.quiz-shell{max-width:680px;margin:0 auto}.quiz-loading{display:flex;flex-direction:column;align-items:center;text-align:center;padding:90px 0 40px}.spinner{width:32px;height:32px;border-radius:50%;border:3px solid var(--accent-soft);border-top-color:var(--accent);animation:spin .8s linear infinite;margin-bottom:20px}.quiz-loading-text{font-family:var(--font-serif);font-size:1.2rem;font-weight:600;margin:0 0 6px}.quiz-loading-hint{color:var(--text-muted);font-size:.92rem;margin:0}.quiz-loading .form-error{margin-bottom:20px}.quiz-loading .quiz-actions{justify-content:center;margin-top:6px}.quiz-header{margin-bottom:26px}.quiz-eyebrow{margin:0 0 4px;font-size:.75rem;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--accent)}.quiz-lesson-title{font-family:var(--font-serif);font-size:1.5rem;font-weight:600;letter-spacing:-.01em;line-height:1.3;margin:0 0 18px}.quiz-progress-label{color:var(--text-muted);font-size:.88rem;font-variant-numeric:tabular-nums;margin:0 0 8px}.quiz-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:26px 28px;box-shadow:var(--shadow-xs);animation:rise-in .3s var(--ease-out)}.quiz-question{font-family:var(--font-serif);font-size:1.15rem;line-height:1.6;margin-bottom:22px;white-space:pre-line}.quiz-choices{display:flex;flex-direction:column;gap:10px}.quiz-choice{display:flex;align-items:flex-start;gap:12px;width:100%;text-align:left;padding:12px 14px;border:1px solid var(--border-strong);border-radius:var(--radius-md);background:var(--surface);color:var(--text);cursor:pointer;transition:border-color .14s ease,background-color .14s ease,transform .1s ease,opacity .2s ease}.quiz-choice:hover:not(:disabled){border-color:var(--accent);background:var(--accent-tint)}.quiz-choice:active:not(:disabled){transform:translateY(1px)}.quiz-choice:disabled{cursor:default}.quiz-choice.selected{border-color:var(--accent);background:var(--accent-soft)}.quiz-choice.correct{border-color:var(--success);background:var(--success-bg)}.quiz-choice.incorrect{border-color:var(--danger-border);background:var(--danger-bg)}.quiz-choice.dimmed{opacity:.55}.quiz-choice-letter{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:26px;height:26px;border-radius:50%;border:1px solid var(--border-strong);background:var(--surface);font-size:.82rem;font-weight:600;margin-top:1px;transition:border-color .14s ease,background-color .14s ease,color .14s ease}.quiz-choice.selected .quiz-choice-letter{border-color:var(--accent);background:var(--accent);color:#fff;animation:pop-in .24s var(--ease-spring)}.quiz-choice.correct 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