.mysql-page{height:100%}:root{--bg:#f6f7fb;--surface:#fff;--ink:#1e2235;--ink-soft:#5b6178;--ink-faint:#9aa0b4;--line:#e6e8f0;--line-soft:#eef0f6;--brand:#5b5ef5;--brand-soft:#eeeffd;--brand-deep:#4043d8;--accent:#0fb9a6;--accent-soft:#e2f7f4;--amber:#f59e0b;--amber-soft:#fef3e0;--rose:#f0546b;--rose-soft:#fde8ec;--code-bg:#1b1e36;--code-ink:#e9ebff;--shadow:0 1px 3px #1c203c0f,0 6px 24px #1c203c0f;--radius:14px;--mono:"SF Mono","JetBrains Mono","Fira Code",Menlo,Consolas,monospace;--sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}*{box-sizing:border-box;margin:0;padding:0}html,body{height:100%}body{font-family:var(--sans);background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;font-size:15px;line-height:1.7}::-webkit-scrollbar{width:9px;height:9px}::-webkit-scrollbar-thumb{background:#d2d6e4;border-radius:6px}::-webkit-scrollbar-thumb:hover{background:#b8bdcf}.app{grid-template-columns:282px 1fr;height:100vh;display:grid;overflow:hidden}@media (width<=860px){.app{grid-template-columns:1fr}}.sidebar{background:var(--surface);border-right:1px solid var(--line);flex-direction:column;display:flex;overflow:hidden}.brand{border-bottom:1px solid var(--line-soft);padding:22px 22px 16px}.brand h1{letter-spacing:-.3px;align-items:center;gap:8px;font-size:18px;font-weight:800;display:flex}.brand .logo{background:linear-gradient(135deg,var(--brand),var(--accent));color:#fff;border-radius:8px;flex-shrink:0;justify-content:center;align-items:center;width:30px;height:30px;font-size:13px;font-weight:800;display:flex}.brand p{color:var(--ink-faint);margin-top:4px;font-size:12px}.progress-wrap{border-bottom:1px solid var(--line-soft);padding:14px 22px}.progress-bar{background:var(--line);border-radius:4px;height:7px;overflow:hidden}.progress-bar>div{background:linear-gradient(90deg,var(--brand),var(--accent));border-radius:4px;width:0;height:100%;transition:width .4s}.progress-text{color:var(--ink-faint);justify-content:space-between;margin-top:6px;font-size:11px;display:flex}.nav{scrollbar-width:none;flex:1;padding:10px 12px 30px;overflow-y:auto}.nav::-webkit-scrollbar{display:none}.nav:after{content:"";background:linear-gradient(to bottom,transparent,var(--surface));pointer-events:none;height:28px;margin:0 -12px -30px;display:block;position:sticky;bottom:0;left:0;right:0}.nav-section-header{cursor:pointer;user-select:none;border-radius:9px;justify-content:space-between;align-items:center;margin:2px 0;padding:8px 10px;transition:background .15s;display:flex}.nav-section-header:hover{background:var(--line-soft)}.nav-section-title{color:var(--ink-faint);text-transform:uppercase;letter-spacing:.6px;font-size:11px;font-weight:700}.nav-section-arrow{color:var(--ink-faint);flex-shrink:0;margin-left:6px;font-size:10px;transition:transform .25s}.nav-section-header.collapsed .nav-section-arrow{transform:rotate(-90deg)}.nav-section-children{grid-template-rows:1fr;transition:grid-template-rows .25s,opacity .2s;display:grid;overflow:hidden}.nav-section-children.collapsed{opacity:0;grid-template-rows:0fr}.nav-section-children>div{min-height:0}.nav-item{cursor:pointer;color:var(--ink-soft);user-select:none;border-radius:9px;align-items:center;gap:10px;padding:8px 10px;font-size:13.5px;transition:all .15s;display:flex}.nav-item:hover{background:var(--brand-soft);color:var(--brand-deep)}.nav-item.active{background:var(--brand);color:#fff;font-weight:600;box-shadow:0 3px 10px #5b5ef54d}.nav-item .num{background:var(--line);border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;width:22px;height:22px;font-size:11px;font-weight:700;display:flex}.nav-item.active .num{background:#ffffff40}.nav-item.done .num{background:var(--accent);color:#fff}.main{position:relative;overflow-y:auto}.topbar{z-index:20;backdrop-filter:blur(12px);border-bottom:1px solid var(--line);background:#f6f7fbd9;justify-content:space-between;align-items:center;gap:16px;padding:12px 36px;display:flex;position:sticky;top:0}.topbar .crumb{color:var(--ink-faint);font-size:13px}.topbar .crumb b{color:var(--ink);font-weight:600}.btn{background:var(--surface);border:none;border:1px solid var(--line);color:var(--ink-soft);cursor:pointer;font-size:13px;font-weight:600;font-family:var(--sans);border-radius:9px;align-items:center;gap:6px;padding:8px 14px;transition:all .15s;display:inline-flex}.btn-accent{border-color:var(--accent);color:var(--accent)}.btn-brand{background:var(--brand);color:#fff;border-color:var(--brand)}.btn:hover{border-color:var(--brand);color:var(--brand)}.content{max-width:860px;margin:0 auto;padding:30px 36px 140px}.lesson-head{margin-bottom:24px}.lesson-tag{color:var(--brand);background:var(--brand-soft);letter-spacing:.4px;border-radius:20px;align-items:center;padding:4px 11px;font-size:11px;font-weight:700;display:inline-flex}.lesson-head h2{letter-spacing:-.6px;margin:12px 0 6px;font-size:28px;font-weight:800;line-height:1.25}.lesson-head .sub{color:var(--ink-soft);font-size:15px}.prose p{color:var(--ink-soft);margin:13px 0}.prose p strong{color:var(--ink);font-weight:650}.prose h3{color:var(--ink);letter-spacing:-.2px;margin:26px 0 8px;font-size:18px;font-weight:700}.prose ul,.prose ol{color:var(--ink-soft);margin:10px 0 10px 22px}.prose li{margin:5px 0}.prose code{font-family:var(--mono);background:var(--brand-soft);color:var(--brand-deep);border-radius:5px;padding:1px 6px;font-size:13px}.callout{border:1px solid;border-radius:12px;gap:12px;margin:16px 0;padding:14px 17px;font-size:14px;display:flex}.callout .ico{flex-shrink:0;font-size:16px;line-height:1.7}.callout.tip{background:var(--accent-soft);border-color:#bfeae3}.callout.warn{background:var(--amber-soft);border-color:#fde3b5}.callout.note{background:var(--brand-soft);border-color:#d6d8fb}.callout .body{color:var(--ink-soft)}.callout .body strong{color:var(--ink)}.code-block{background:var(--code-bg);box-shadow:var(--shadow);border-radius:12px;margin:16px 0;overflow:hidden}.code-block .code-head{background:#ffffff0d;border-bottom:1px solid #ffffff0f;justify-content:space-between;align-items:center;padding:8px 14px;display:flex}.code-block .code-head .label{color:#8a8fcf;letter-spacing:.5px;font-size:11px;font-weight:600;font-family:var(--mono)}.code-actions{gap:6px;display:flex}.code-actions button{color:#c5c9f0;cursor:pointer;font-size:11.5px;font-weight:600;font-family:var(--sans);background:#ffffff14;border:none;border-radius:6px;padding:5px 11px;transition:all .15s}.code-actions button:hover{color:#fff;background:#ffffff29}.code-actions button.run{background:var(--accent);color:#fff}.code-actions button.run:hover{background:#0aa392}.code-block pre{font-family:var(--mono);color:var(--code-ink);margin:0;padding:14px 16px;font-size:13.5px;line-height:1.65;overflow-x:auto}.code-body{background:var(--code-bg);display:flex}.code-body .line-numbers{text-align:right;user-select:none;background:#0000001f;border-right:1px solid #ffffff12;flex-shrink:0;padding:14px 12px 14px 16px}.code-body .line-numbers .ln{font-family:var(--mono);color:#5b5f8a;font-size:12.5px;line-height:1.65;display:block}.code-body pre{font-family:var(--mono);color:var(--code-ink);flex:1;margin:0;padding:14px 16px;font-size:13.5px;line-height:1.65;overflow-x:auto}.result-wrap{border:1px solid var(--line);background:var(--surface);border-radius:12px;margin:0 0 16px;overflow:hidden}.result-head{background:var(--line-soft);color:var(--ink-faint);letter-spacing:.4px;z-index:5;justify-content:space-between;align-items:center;padding:8px 14px;font-size:11.5px;font-weight:700;display:flex;position:sticky;top:0}.badge{border-radius:10px;padding:2px 8px;font-size:10px;font-weight:700}.badge.err{background:var(--rose);color:#fff}.badge.ok{background:var(--accent);color:#fff}.badge.info{background:var(--brand);color:#fff}.result-table{border-collapse:collapse;width:100%;font-size:13px}.result-table th{background:var(--line-soft);text-align:left;color:var(--ink);border-bottom:1px solid var(--line);white-space:nowrap;padding:8px 13px;font-size:12px;font-weight:700}.result-table td{border-bottom:1px solid var(--line-soft);color:var(--ink-soft);padding:7px 13px}.result-table tr:last-child td{border-bottom:none}.result-table td.null{color:var(--ink-faint);font-style:italic}.result-table tr:hover td{background:var(--brand-soft)}.result-msg{font-size:13.5px;font-family:var(--mono);color:var(--ink-soft);padding:13px 16px}.result-msg.err{color:var(--rose)}.quiz{background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);border-radius:14px;margin:24px 0;padding:20px 22px}.quiz-head{align-items:center;gap:8px;margin-bottom:12px;display:flex}.qtag{color:#fff;background:var(--brand);letter-spacing:.4px;border-radius:20px;padding:3px 10px;font-size:11px;font-weight:700}.quiz-q{color:var(--ink);margin-bottom:13px;font-size:15px;font-weight:500}.quiz-opts{flex-direction:column;gap:9px;display:flex}.quiz-opt{border:1.5px solid var(--line);cursor:pointer;color:var(--ink-soft);border-radius:10px;align-items:center;gap:11px;padding:10px 14px;font-size:14px;transition:all .15s;display:flex}.quiz-opt:hover{border-color:var(--brand);background:var(--brand-soft)}.quiz-opt .letter{background:var(--line);width:24px;height:24px;color:var(--ink-soft);border-radius:7px;flex-shrink:0;justify-content:center;align-items:center;font-size:12px;font-weight:700;display:flex}.quiz-opt.correct{border-color:var(--accent);background:var(--accent-soft);color:var(--ink);font-weight:600}.quiz-opt.correct .letter{background:var(--accent);color:#fff}.quiz-opt.wrong{border-color:var(--rose);background:var(--rose-soft);color:var(--ink)}.quiz-opt.wrong .letter{background:var(--rose);color:#fff}.quiz-opt.disabled{cursor:default;pointer-events:none}.quiz-explain{border-radius:10px;margin-top:12px;padding:12px 14px;font-size:13.5px;line-height:1.6;display:none}.quiz-explain.show{animation:.3s fade;display:block}.quiz-explain.right{background:var(--accent-soft);color:#0a8a7a;border:1px solid #bfeae3}.quiz-explain.wrong{background:var(--rose-soft);color:#c43a52;border:1px solid #f6cdd3}@keyframes fade{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.lesson-nav{justify-content:space-between;gap:12px;margin-top:32px;display:flex}.lesson-nav .btn{flex:1;justify-content:center;padding:11px 16px}.dock{background:var(--surface);border-top:1px solid var(--line);z-index:30;width:calc(100% - 282px);transition:transform .35s cubic-bezier(.4,0,.2,1);position:fixed;bottom:0;right:0;box-shadow:0 -6px 24px #1c203c14}.dock.collapsed{transform:translateY(calc(100% - 46px))}.dock-toggle{cursor:pointer;user-select:none;justify-content:space-between;align-items:center;height:46px;padding:0 24px;display:flex}.dock-toggle .t-label{color:var(--ink);align-items:center;gap:8px;font-size:13px;font-weight:700;display:flex}.dock-toggle .dot{background:var(--accent);border-radius:50%;width:8px;height:8px}.dock-toggle .t-actions{color:var(--ink-faint);align-items:center;gap:8px;font-size:11px;display:flex}.chev{color:var(--ink-faint);transition:transform .35s}.dock.collapsed .chev{transform:rotate(180deg)}.dock-body{background:var(--line);gap:1px;height:320px;display:flex;overflow:hidden}.dock-editor{background:var(--code-bg);flex-direction:column;flex:1;display:flex}.dock-editor textarea{color:var(--code-ink);font-family:var(--mono);resize:none;tab-size:2;white-space:pre;background:0 0;border:none;outline:none;flex:1;padding:14px 16px;font-size:13.5px;line-height:1.7;overflow:auto}.dock-editor textarea::placeholder{color:#5b5f8a}.dock-result{background:var(--surface);flex-direction:column;flex:1.1;display:flex;overflow:auto}@media (width<=860px){.dock{width:100%}.dock-body{flex-direction:column;height:420px}}.schema-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:10px;margin:14px 0;display:grid}.schema-card{background:var(--surface);border:1px solid var(--line);cursor:pointer;border-radius:11px;padding:12px 14px;transition:all .15s}.schema-card:hover{border-color:var(--brand);box-shadow:var(--shadow)}.schema-card .tn{color:var(--brand-deep);font-size:13px;font-weight:700;font-family:var(--mono)}.schema-card .tc{color:var(--ink-faint);margin-top:3px;font-size:11px}.schema-detail{background:var(--code-bg);font-family:var(--mono);color:var(--code-ink);white-space:pre;border-radius:11px;margin:12px 0;padding:15px 17px;font-size:12.5px;line-height:1.6;overflow-x:auto}.table-pill{font-family:var(--mono);background:var(--brand-soft);color:var(--brand-deep);border-radius:5px;padding:1px 7px;font-size:12px;font-weight:600;display:inline-block}.cmp-table{border-collapse:collapse;width:100%;margin:14px 0;font-size:13.5px}.cmp-table th{background:var(--line-soft);border:1px solid var(--line);text-align:left;padding:9px}.cmp-table td{border:1px solid var(--line);color:var(--ink-soft);padding:9px}.toast{background:var(--ink);color:#fff;z-index:100;opacity:0;pointer-events:none;border-radius:10px;padding:10px 20px;font-size:13px;transition:opacity .3s;position:fixed;top:20px;left:50%;transform:translate(-50%)}.toast.show{opacity:1}.toast.ok{background:var(--accent)}.toast.err{background:var(--rose)}