:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light;--page-bg:#f5f7fb;--surface:#fff;--surface-soft:#f1f3f7;--border:#e2e6ee;--text-primary:#202633;--text-secondary:#737b8c;--button-bg:#e9edf4;--button-hover:#dde3ed;--button-text:#273244;--study-card-bg:#fff;--study-card-border:#dfe4ec;--shadow:0 12px 32px #0f172a12;--knowledge-title:#dc4c4c;--knowledge-point:#3978c8;--high-bg:#eef9f0;--high-border:#cbe9d0;--high-text:#288444;--text:var(--text-secondary);--text-h:var(--text-primary);--bg:var(--page-bg);--code-bg:var(--surface-soft);--sans:system-ui, "Segoe UI", Roboto, sans-serif;--heading:system-ui, "Segoe UI", Roboto, sans-serif;--mono:ui-monospace, Consolas, monospace;font:18px/145% var(--sans);letter-spacing:.18px;color:var(--text);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (width<=1024px){:root{font-size:16px}}:root[data-theme=dark]{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--page-bg:#111318;--surface:#171a21;--surface-soft:#1d2028;--border:#2c313d;--text-primary:#f3f4f6;--text-secondary:#9ca3af;--button-bg:#232938;--button-hover:#2b3345;--button-text:#f8fafc;--study-card-bg:#1f2430;--study-card-border:#2d3445;--shadow:0 12px 32px #0000002e;--knowledge-title:#f87171;--knowledge-point:#60a5fa;--high-bg:#22c55e17;--high-border:#4ade8047;--high-text:#86efac}#root{text-align:center;border-inline:1px solid var(--border);box-sizing:border-box;flex-direction:column;width:1126px;max-width:100%;min-height:100svh;margin:0 auto;display:flex}body{background:var(--page-bg);min-height:100vh;color:var(--text-primary);margin:0;transition:background .2s,color .2s}h1,h2{font-family:var(--heading);color:var(--text-h);font-weight:500}h1{letter-spacing:-1.68px;margin:32px 0;font-size:56px}@media (width<=1024px){h1{margin:20px 0;font-size:36px}}h2{letter-spacing:-.24px;margin:0 0 8px;font-size:24px;line-height:118%}@media (width<=1024px){h2{font-size:20px}}p{margin:0}code,.counter{font-family:var(--mono);color:var(--text-h);border-radius:4px;display:inline-flex}code{background:var(--code-bg);padding:4px 8px;font-size:15px;line-height:135%}#root{width:100%;min-height:100vh}.app{width:min(100% - 32px,920px);min-height:100vh;margin:0 auto;padding:72px 0}.hero{margin-bottom:40px}.eyebrow{color:var(--text-secondary);margin-bottom:8px;font-size:15px}.hero h1{margin:0;font-size:44px;line-height:1.2}.subtitle{color:var(--text-secondary);margin-top:14px;font-size:17px}.primary-button{border:1px solid var(--border);background:var(--button-bg);color:var(--button-text);cursor:pointer;border-radius:12px;margin-top:26px;padding:14px 24px;font-size:16px;font-weight:600}.primary-button:hover{background:var(--button-hover)}.today-card{border:1px solid var(--border);background:var(--border);border-radius:16px;grid-template-columns:repeat(3,1fr);gap:1px;margin-bottom:24px;display:grid;overflow:hidden}.today-card div{background:var(--surface);flex-direction:column;gap:8px;padding:24px;display:flex}.today-card span{color:var(--text-secondary);font-size:14px}.today-card strong{font-size:24px}.menu-grid{grid-template-columns:repeat(2,1fr);gap:16px;display:grid}.menu-card{border:1px solid var(--border);background:var(--surface);min-height:150px;color:var(--text-primary);text-align:left;cursor:pointer;border-radius:16px;padding:24px}.menu-card:hover{background:var(--surface-soft)}.menu-card strong{margin-bottom:10px;font-size:20px;display:block}.menu-card span{color:var(--text-secondary);font-size:14px;line-height:1.6}.energy-study{max-width:760px}.study-breadcrumb{color:var(--text-secondary);margin-top:32px;font-size:14px}.study-breadcrumb span{color:var(--text-secondary);margin:0 8px}.study-heading{justify-content:space-between;align-items:flex-end;gap:24px;margin:28px 0 24px;display:flex}.study-heading .eyebrow{margin:0 0 6px}.study-heading h1{margin:0;font-size:38px}.study-progress{text-align:right;gap:4px;padding-bottom:6px;display:grid}.study-progress span{color:var(--text-secondary);font-variant-numeric:tabular-nums;font-size:14px}.card-progress{color:var(--text-primary);font-variant-numeric:tabular-nums;font-size:16px}.knowledge-card{border:1px solid var(--study-card-border);background:var(--study-card-bg);min-height:300px;box-shadow:var(--shadow);box-sizing:border-box;border-radius:18px;padding:32px}.knowledge-card-header{justify-content:space-between;align-items:center;gap:16px;display:flex}.card-label{color:var(--text-secondary);letter-spacing:.08em;font-size:13px}.card-navigation{justify-content:space-between;gap:16px;margin-top:20px;display:flex}.secondary-button,.status-button{border:1px solid var(--border);background:var(--button-bg);min-height:48px;color:var(--button-text);cursor:pointer;border-radius:12px;font-size:15px}.secondary-button{min-width:112px;padding:0 20px}.secondary-button:hover:not(:disabled),.status-button:hover{background:var(--button-hover)}.status-button.active{color:#fff;background:#343842;border-color:#727783;box-shadow:inset 0 0 0 1px #565b66}.status-button.active:hover{background:#3b404b}.secondary-button:disabled{color:#60636b;cursor:not-allowed;opacity:.65}.mastery-actions{grid-template-columns:repeat(3,1fr);gap:12px;margin-top:28px;display:grid}@media (width<=650px){.app{width:min(100% - 24px,920px);padding:40px 0}.hero h1{font-size:34px}.today-card,.menu-grid{grid-template-columns:1fr}.study-heading{align-items:center;margin-top:24px}.study-heading h1{font-size:32px}.knowledge-card{min-height:280px;padding:24px 20px}.mastery-actions{gap:8px}.status-button{padding:0 8px;font-size:14px}}.progress-detail{color:var(--text-secondary);margin-top:2px;font-size:12px}.knowledge-title{color:var(--knowledge-title);margin:0 0 24px;font-size:26px;line-height:1.4}.knowledge-points{flex-direction:column;gap:12px;display:flex}.knowledge-point{color:var(--knowledge-point);margin:0;font-size:17px;line-height:1.8}.knowledge-note{color:var(--text-primary);margin:0;font-size:17px;line-height:1.8}.high-frequency-box{border:1px solid var(--high-border);background:var(--high-bg);border-radius:12px;margin-top:24px;padding:18px 20px}.high-frequency-point{color:var(--high-text);margin:0;font-size:17px;line-height:1.8}.high-frequency-point+.high-frequency-point{margin-top:10px}@media (width<=650px){.knowledge-title{font-size:22px}.knowledge-point,.knowledge-note,.high-frequency-point{font-size:16px}.high-frequency-box{padding:16px}}.theme-switch{justify-content:flex-end;gap:8px;margin-bottom:24px;display:flex}.theme-option{border:1px solid var(--border);background:var(--surface);color:var(--text-secondary);cursor:pointer;border-radius:10px;padding:8px 14px;font-size:14px}.theme-option:hover{background:var(--surface-soft)}.theme-option.active{background:var(--button-bg);color:var(--text-primary);border-color:var(--text-secondary);font-weight:600}.knowledge-tree-card{border:1px solid var(--border);background:var(--surface);border-radius:16px;padding:24px}.knowledge-tree-card>h2{color:var(--text-primary);margin:0 0 16px;font-size:21px}.knowledge-tree-item{border:0;border-top:1px solid var(--border);width:100%;color:var(--knowledge-point);text-align:left;cursor:pointer;background:0 0;padding:10px 0;font-size:15px;line-height:1.6;display:block}.knowledge-tree-item:first-of-type{border-top:0}.knowledge-tree-item:hover{color:var(--text-primary)}.study-back-row{justify-content:center;margin-top:16px;display:flex}.study-back-row .primary-button{margin-top:0}