:root{--bg: #f6f8fb;--surface: #ffffff;--surface-soft: #f8fafc;--text: #172033;--muted: #64748b;--border: #dbe3ee;--nav: #101827;--blue: #2563eb;--purple: #7c3aed;--green: #059669;--orange: #d97706;--code: #111827;--radius: 8px;--footer-height: 68px}*{box-sizing:border-box}body{margin:0;padding-bottom:calc(var(--footer-height) + env(safe-area-inset-bottom));background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,sans-serif;font-size:15px;line-height:1.7;overflow-x:hidden}button,textarea{font:inherit}button{cursor:pointer}img,video,canvas,svg{max-width:100%}.top-bar{position:sticky;top:0;z-index:30;display:flex;align-items:stretch;min-height:56px;background:var(--nav);box-shadow:0 2px 12px #0f172a38}.nav-main{display:flex;flex:0 0 auto;align-items:stretch}.brand-button{flex:0 0 auto;border:0;border-right:1px solid rgba(148,163,184,.2);background:transparent;color:#cbd5e1;font-weight:800;padding:0 22px}.brand-button:hover{background:#ffffff0d;color:#fff}.nav-toggle{display:none}.nav-scroll{display:flex;align-items:stretch;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:thin}.nav-tab{display:inline-flex;align-items:center;gap:8px;min-height:56px;border:0;border-bottom:3px solid transparent;background:transparent;color:#94a3b8;font-size:14px;font-weight:700;white-space:nowrap;padding:0 18px}.nav-tab span{color:#64748b;font-size:11px;font-weight:800}.nav-tab:hover{background:#ffffff0d;color:#e2e8f0}.nav-tab.active{color:#fff}.nav-tab[data-color=blue].active{border-color:var(--blue)}.nav-tab[data-color=purple].active{border-color:var(--purple)}.nav-tab[data-color=green].active,.nav-tab.utility.active{border-color:var(--green)}.nav-tab[data-color=orange].active{border-color:var(--orange)}.page-shell,.editor-page{width:min(1120px,calc(100% - 32px));margin:0 auto;padding:34px 0 76px}.module-header,.practice-header,.editor-heading{display:flex;justify-content:space-between;gap:24px;margin-bottom:24px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);padding:28px;box-shadow:0 1px 3px #0f172a0a}.module-header{align-items:flex-start;color:#fff;border:0}.module-header.blue{background:linear-gradient(135deg,#1d4ed8,#2563eb)}.module-header.purple{background:linear-gradient(135deg,#6d28d9,#8b5cf6)}.module-header.green{background:linear-gradient(135deg,#047857,#10b981)}.module-header.orange{background:linear-gradient(135deg,#b45309,#f59e0b)}.module-icon{flex:0 0 auto;font-size:46px;line-height:1}.eyebrow{color:inherit;font-size:12px;font-weight:800;letter-spacing:.08em;opacity:.72;text-transform:uppercase}h1,h2,h3,p{margin-top:0}.module-header h1,.practice-header h1,.editor-heading h1{margin-bottom:8px;font-size:clamp(25px,4vw,38px);line-height:1.2}.module-header p,.practice-header p,.editor-heading p{max-width:720px;margin-bottom:0;color:inherit;opacity:.82}.primary-action,.practice-card button,.editor-actions button,.details-toggle{border:1px solid var(--border);border-radius:6px;background:#fff;color:var(--text);font-weight:700;padding:8px 14px}.primary-action{margin-top:18px;border-color:#ffffff61}.primary-action:hover,.practice-card button:hover,.editor-actions button:hover,.details-toggle:hover{transform:translateY(-1px);box-shadow:0 8px 20px #0f172a14}.solid-action{border-color:#14532d;background:#15803d;color:#fff}.learning-flow{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(280px,.65fr);gap:18px;margin-bottom:18px}.intro-card,.check-card,.action-section,.ai-guide,.details-card{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);padding:24px;box-shadow:0 1px 3px #0f172a0a}.intro-card h2,.check-card h2,.action-section h2,.ai-guide h2,.details-card h2{margin-bottom:8px;font-size:20px;line-height:1.3}.intro-card p,.check-card p,.action-section p,.ai-guide p,.details-card p{color:#475569}.intro-card .primary-action{margin-top:18px}.compact-list{display:grid;gap:10px;margin:0;padding:0;list-style:none}.compact-list li{position:relative;padding-left:22px;color:#334155}.compact-list li:before{position:absolute;top:0;left:0;color:var(--green);font-weight:900;content:"✓"}.action-section,.ai-guide,.details-section{margin-top:18px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:18px;margin-bottom:16px}.section-heading span{max-width:340px;color:var(--muted);font-size:13px;line-height:1.55}.setup-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px}.setup-step{display:flex;gap:12px;align-items:flex-start;border:1px solid #e8eef6;border-radius:var(--radius);background:var(--surface-soft);padding:16px}.setup-step p{margin:0;color:#334155;font-weight:650;line-height:1.55}.step-index{display:flex;flex:0 0 auto;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:#e0f2fe;color:#075985;font-size:13px;font-weight:900}.ai-guide{border-left:4px solid var(--green);background:#f3fbf7}.ai-guide p{margin-bottom:0;color:#14532d;font-weight:650}.details-card{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:14px}.details-card p{margin-bottom:0}.details-toggle{flex:0 0 auto}.markdown-body{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);padding:30px;box-shadow:0 1px 3px #0f172a0a}.markdown-body>:first-child{margin-top:0}.markdown-body>:last-child{margin-bottom:0}.markdown-body h1{margin-bottom:12px;padding-bottom:12px;border-bottom:1px solid var(--border);font-size:30px;line-height:1.25}.markdown-body h2{margin:30px 0 12px;font-size:22px;line-height:1.32}.markdown-body h3{margin:24px 0 10px;font-size:17px}.markdown-body p,.markdown-body li{color:#334155;overflow-wrap:anywhere}.markdown-body a{color:var(--blue);font-weight:700}.markdown-body code{border-radius:4px;background:#eef2f7;color:#0f172a;font-family:SF Mono,Fira Code,Consolas,monospace;font-size:.9em;padding:2px 5px}.markdown-body pre{overflow-x:auto;border-radius:var(--radius);background:var(--code);color:#dbeafe;padding:16px 18px;-webkit-overflow-scrolling:touch}.markdown-body pre code{background:transparent;color:inherit;padding:0}.markdown-body blockquote{margin:18px 0;border-left:4px solid #94a3b8;background:#f8fafc;color:#475569;padding:12px 16px}.markdown-body table{display:block;max-width:100%;width:100%;overflow-x:auto;border-collapse:collapse;margin:18px 0;-webkit-overflow-scrolling:touch}.markdown-body th,.markdown-body td{border:1px solid var(--border);padding:10px 12px;text-align:left;vertical-align:top}.markdown-body th{background:#f1f5f9;color:#475569}.editor-heading{align-items:flex-start}.editor-actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px;min-width:280px}.editor-actions .solid{border-color:#14532d;background:#15803d;color:#fff}.editor-stats{display:flex;gap:10px;margin:-8px 0 14px;color:var(--muted);font-size:13px;font-weight:700}.editor-stats span{border:1px solid var(--border);border-radius:999px;background:#fff;padding:3px 10px}.editor-grid{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);min-height:620px;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:var(--surface);box-shadow:0 1px 3px #0f172a0a}.editor-panel{display:flex;min-width:0;flex-direction:column}.editor-panel:first-child{border-right:1px solid var(--border)}.panel-label{flex:0 0 auto;border-bottom:1px solid var(--border);background:#f8fafc;color:var(--muted);font-size:12px;font-weight:800;letter-spacing:.08em;padding:9px 14px;text-transform:uppercase}textarea{min-height:580px;width:100%;flex:1;resize:vertical;border:0;outline:none;background:#101827;color:#dbeafe;font-family:SF Mono,Fira Code,Consolas,monospace;font-size:14px;line-height:1.72;padding:18px}.preview-panel .markdown-body{flex:1;overflow:auto;border:0;border-radius:0;box-shadow:none}.practice-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:16px}.practice-card{border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);padding:22px;box-shadow:0 1px 3px #0f172a0a}.practice-card h2{margin-bottom:10px;font-size:19px}.practice-card p{min-height:56px;color:var(--muted)}.practice-meta{display:flex;gap:8px;margin-bottom:14px}.practice-meta span{border-radius:999px;background:#eef2ff;color:#3730a3;font-size:12px;font-weight:800;padding:3px 9px}footer{position:fixed;right:0;bottom:0;left:0;z-index:25;display:flex;min-height:var(--footer-height);justify-content:center;align-items:center;gap:10px;background:var(--nav);color:#94a3b8;padding:12px 24px calc(12px + env(safe-area-inset-bottom));font-size:13px;box-shadow:0 -2px 12px #0f172a2e}footer strong{color:#e2e8f0}@media (max-width: 820px){.top-bar{display:block}.nav-main{display:flex;min-height:48px;align-items:stretch}.brand-button{flex:1 1 auto;width:auto;min-height:48px;border-right:0;border-bottom:0}.nav-toggle{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-width:96px;border:0;border-left:1px solid rgba(148,163,184,.2);background:transparent;color:#e2e8f0;font-weight:800}.nav-toggle-icon{display:inline-flex;align-items:center;justify-content:center;width:24px;height:24px;border-radius:6px;background:#ffffff14;line-height:1}.nav-scroll{display:none;border-top:1px solid rgba(148,163,184,.2);background:#0f172a;padding:8px}.top-bar.nav-open .nav-scroll{display:grid;grid-template-columns:1fr;gap:6px}.nav-tab{justify-content:flex-start;min-height:44px;border-bottom:0;border-left:3px solid transparent;border-radius:6px;padding:0 12px}.nav-tab[data-color=blue].active{border-color:var(--blue)}.nav-tab[data-color=purple].active{border-color:var(--purple)}.nav-tab[data-color=green].active,.nav-tab.utility.active{border-color:var(--green)}.nav-tab[data-color=orange].active{border-color:var(--orange)}.page-shell,.editor-page{width:min(100% - 20px,1120px);padding-top:18px}.module-header,.practice-header,.editor-heading,.details-card{display:block;padding:22px}.module-icon{margin-bottom:14px}.editor-actions{justify-content:flex-start;min-width:0;margin-top:18px}.learning-flow{grid-template-columns:1fr}.section-heading{display:block}.section-heading span{display:block;margin-top:8px}.details-toggle{margin-top:18px}.editor-grid{grid-template-columns:1fr}.editor-panel:first-child{border-right:0;border-bottom:1px solid var(--border)}textarea{min-height:360px}footer{flex-direction:column;align-items:center;gap:2px}}@media (max-width: 640px){:root{--footer-height: 64px}body{font-size:14px}.top-bar{position:sticky}.brand-button{min-height:44px;padding:0 14px;text-align:left}.nav-scroll{padding:8px}.nav-tab{min-height:48px;gap:6px;padding:0 12px;font-size:13px}.nav-tab span{font-size:10px}.page-shell,.editor-page{width:min(100% - 16px,1120px);padding:12px 0 28px}.module-header,.practice-header,.editor-heading,.intro-card,.check-card,.action-section,.ai-guide,.details-card,.practice-card{padding:18px}.module-header,.practice-header,.editor-heading{margin-bottom:14px}.module-icon{font-size:34px;margin-bottom:10px}.module-header h1,.practice-header h1,.editor-heading h1{font-size:26px}.intro-card h2,.check-card h2,.action-section h2,.ai-guide h2,.details-card h2{font-size:18px}.learning-flow{gap:12px;margin-bottom:12px}.action-section,.ai-guide,.details-section{margin-top:12px}.setup-grid,.practice-grid{grid-template-columns:1fr}.setup-step{padding:14px}.primary-action,.practice-card button,.editor-actions button,.details-toggle{min-height:42px;width:100%;justify-content:center}.details-card{margin-bottom:10px}.markdown-body{padding:18px}.markdown-body h1{font-size:23px}.markdown-body h2{margin-top:24px;font-size:19px}.markdown-body h3{font-size:16px}.markdown-body pre{padding:14px}.editor-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));width:100%}.editor-stats{flex-wrap:wrap;gap:8px;margin:-2px 0 10px}.editor-grid{min-height:0}textarea{min-height:300px;font-size:13px;padding:14px}.preview-panel .markdown-body{max-height:520px}}@media (max-width: 420px){.page-shell,.editor-page{width:min(100% - 12px,1120px)}.nav-scroll{padding:0 6px}.nav-tab{padding:0 10px}.module-header,.practice-header,.editor-heading,.intro-card,.check-card,.action-section,.ai-guide,.details-card,.practice-card,.markdown-body{padding:16px}.module-header h1,.practice-header h1,.editor-heading h1{font-size:24px}.editor-actions{grid-template-columns:1fr}.editor-stats span{flex:1 1 auto;text-align:center}footer{padding:18px 12px;text-align:center}}
