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var(--border);width:100%;color:var(--text);cursor:pointer;background:0 0;flex-direction:column;align-items:flex-start;gap:2px;padding:11px 14px;display:flex}.list-item:last-child{border-bottom:none}.list-item:hover{background:var(--bg)}.sub{color:var(--muted);font-size:12px}.picked{border:1px solid var(--primary);background:var(--bg);border-radius:12px;justify-content:space-between;align-items:center;gap:10px;padding:12px 14px;display:flex}.addbox{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin-top:10px;display:flex}.path-card{border:1.5px solid var(--primary);background:var(--primary)}@supports (color:color-mix(in lab, red, red)){.path-card{background:color-mix(in srgb, var(--primary) 6%, var(--surface))}}.path-card{margin-bottom:18px}.sub-card{border:1.5px solid var(--accent);background:var(--accent);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}@supports (color:color-mix(in lab, red, red)){.sub-card{background:color-mix(in srgb, var(--accent) 8%, var(--surface))}}.sub-card{margin-bottom:16px}.shell{min-height:100vh}.topnav{z-index:30;background:var(--surface);border-bottom:1px solid var(--border);align-items:center;gap:10px;padding:10px 14px;display:flex;position:sticky;top:0}.mini-select{max-width:120px}.topnav .brand{font-size:17px}.hamb{cursor:pointer;color:var(--text);background:0 0;border:none;padding:0 4px;font-size:20px;display:none}.topnav-selectors{scrollbar-width:none;flex:auto;gap:6px;min-width:0;margin-left:8px;display:flex;overflow-x:auto}.topnav-selectors::-webkit-scrollbar{display:none}.mini-select{border:1px solid var(--border);background:var(--bg);width:auto;color:var(--text);border-radius:8px;padding:6px 8px;font-size:13px;font-weight:600}.topnav .controls{margin-left:auto}.body{align-items:flex-start;display:flex}.sidebar{border-right:1px solid var(--border);-webkit-overflow-scrolling:touch;overscroll-behavior:contain;background:var(--surface);scrollbar-width:thin;scrollbar-color:var(--border) transparent;flex:0 0 250px;align-self:flex-start;width:250px;height:calc(100vh - 57px);padding:12px 8px;position:sticky;top:57px;overflow-y:auto}.sidebar::-webkit-scrollbar{width:8px}.sidebar::-webkit-scrollbar-track{background:0 0}.sidebar::-webkit-scrollbar-thumb{background:var(--border);border:2px solid var(--surface);border-radius:999px}.sidebar:hover::-webkit-scrollbar-thumb{background:var(--muted)}.sidebar::-webkit-scrollbar-thumb:hover{background:var(--primary)}.content{flex:1;min-width:0}.side-selectors{border-bottom:1px solid var(--border);gap:6px;margin-bottom:6px;padding:2px 6px 10px;display:flex}.side-select{border:1px solid var(--border);background:var(--bg);min-width:0;color:var(--text);border-radius:8px;flex:1;padding:8px;font-size:13px;font-weight:600}.nav-item{color:var(--text);border-radius:9px;padding:9px 12px;font-size:14px;text-decoration:none;display:block}.nav-item:hover{background:var(--bg)}.nav-item.sub{padding-left:18px;font-size:13.5px}.nav-item.locked{opacity:.5}.nav-acc{text-align:left;cursor:pointer;width:100%;color:var(--text);background:0 0;border:none;border-radius:8px;padding:8px 10px;font-family:inherit;display:block}.nav-acc:hover{background:var(--bg)}.nav-acc .caret{width:14px;color:var(--muted);font-size:11px;display:inline-block}.nav-acc.lvl1{color:var(--text);background:var(--primary);font-size:14px;font-weight:800}@supports (color:color-mix(in lab, red, red)){.nav-acc.lvl1{background:color-mix(in srgb, var(--primary) 9%, transparent)}}.nav-acc.lvl1{margin:8px 0 2px}.nav-acc.lvl1:hover{background:var(--primary)}@supports (color:color-mix(in lab, red, red)){.nav-acc.lvl1:hover{background:color-mix(in srgb, var(--primary) 16%, transparent)}}.nav-acc.lvl1 .caret{color:var(--primary)}.nav-acc.lvl2{color:var(--text);margin-top:2px;padding-left:24px;font-size:13.5px;font-weight:700}.nav-acc.lvl2:hover{background:var(--bg)}.nav-acc.lvl2 .caret{color:var(--muted)}.nav-acc.lvl3{color:var(--muted);border-left:2px solid var(--border);border-radius:0 8px 8px 0;margin-left:22px;padding-left:16px;font-size:12.5px;font-weight:400}.nav-acc.lvl3:hover{color:var(--text);border-left-color:var(--primary)}.nav-leaf{color:var(--text);border-radius:8px;padding:7px 10px;font-size:13px;text-decoration:none;display:block}.nav-leaf:hover{background:var(--bg)}.nav-leaf.lvl3{border-left:2px solid var(--border);color:var(--primary);border-radius:0 8px 8px 0;margin-left:22px;padding-left:16px;font-size:12.5px;font-weight:600}.nav-leaf.lvl3:hover{border-left-color:var(--primary)}.nav-leaf.lvl4{color:var(--muted);padding-left:56px}.nav-leaf.lvl4:hover{color:var(--text)}.nav-leaf.locked{opacity:.5;padding-left:56px}.nav-section{text-transform:uppercase;letter-spacing:.5px;color:var(--muted);padding:12px 12px 6px;font-size:12px;font-weight:800}.btn-section{text-align:left;cursor:pointer;background:0 0;border:none;width:100%;display:block}.nav-chapter{margin-bottom:6px}.nav-chtitle{color:var(--muted);padding:6px 12px;font-size:13px;font-weight:700}.dot{font-size:10px}.dot.MASTERED{color:var(--accent)}.dot.LEARNING{color:var(--primary)}.dot.NOT_KNOWN{color:var(--muted)}.backdrop{display:none}@media (max-width:860px){.hamb{display:block}.sidebar{z-index:40;height:calc(100dvh - 57px);box-shadow:var(--shadow);transition:transform .2s;position:fixed;top:57px;bottom:0;left:0;transform:translate(-100%)}.sidebar-open{transform:translate(0)}.backdrop{z-index:35;background:#0006;display:block;position:fixed;inset:57px 0 0}}.tabs{gap:8px;margin-bottom:16px;padding-bottom:4px;display:flex;overflow-x:auto}.tab{border:1px solid var(--border);background:var(--surface);color:var(--muted);cursor:pointer;white-space:nowrap;border-radius:999px;flex:none;padding:8px 16px;font-size:14px;font-weight:700;transition:all .15s}.tab-active{background:var(--primary);color:var(--primary-contrast);border-color:var(--primary)}.section{color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin:8px 0 12px;font-size:14px;font-weight:700}.subject{margin-bottom:18px}.subject-name{margin:0 0 10px 2px;font-size:16px;font-weight:800}.chapter{margin-bottom:12px;padding:16px}.chapter-head{justify-content:space-between;align-items:center;gap:8px;margin-bottom:10px;display:flex}.tag{border-radius:999px;padding:3px 9px;font-size:11px;font-weight:700}.tag-free{background:var(--accent)}@supports (color:color-mix(in lab, red, red)){.tag-free{background:color-mix(in srgb, var(--accent) 18%, transparent)}}.tag-free{color:var(--accent)}.tag-lock{background:var(--muted)}@supports (color:color-mix(in lab, red, red)){.tag-lock{background:color-mix(in srgb, var(--muted) 18%, transparent)}}.tag-lock{color:var(--muted)}.skills{flex-direction:column;gap:8px;display:flex}.skill-row{border:1px solid var(--border);background:var(--bg);color:var(--text);border-radius:11px;justify-content:space-between;align-items:center;gap:10px;padding:11px 13px;font-size:15px;text-decoration:none;transition:all .15s;display:flex}.skill-row:hover{border-color:var(--primary)}.locked-row{opacity:.6}.badge{white-space:nowrap;border-radius:999px;padding:3px 10px;font-size:11px;font-weight:700}.b-todo{background:var(--muted)}@supports (color:color-mix(in lab, red, red)){.b-todo{background:color-mix(in srgb, var(--muted) 16%, transparent)}}.b-todo{color:var(--muted)}.b-learning{background:var(--primary)}@supports (color:color-mix(in lab, red, red)){.b-learning{background:color-mix(in srgb, var(--primary) 18%, transparent)}}.b-learning{color:var(--primary)}.b-mastered{background:var(--accent)}@supports (color:color-mix(in lab, red, red)){.b-mastered{background:color-mix(in srgb, var(--accent) 18%, transparent)}}.b-mastered{color:var(--accent)}.content-body{white-space:pre-wrap;margin-top:10px;font-size:15px;line-height:1.7}.test-actions{gap:10px;margin-top:16px;display:flex}.btn-outline{color:var(--primary);border:1.5px solid var(--primary);background:0 0}.qcard{margin-bottom:12px;padding:16px}.qstem{margin-bottom:12px;font-size:15.5px;font-weight:700;line-height:1.5}.opt{border:1px solid var(--border);border-radius:11px;margin-bottom:8px;padding:11px 13px;font-size:15px}.opt-pick{cursor:pointer;align-items:center;gap:10px;display:flex}.opt-pick input{width:auto;accent-color:var(--primary)}.opt-selected{border-color:var(--primary);background:var(--primary)}@supports (color:color-mix(in lab, red, red)){.opt-selected{background:color-mix(in srgb, var(--primary) 8%, transparent)}}.opt-correct{border-color:var(--accent);background:var(--accent)}@supports (color:color-mix(in lab, red, red)){.opt-correct{background:color-mix(in srgb, var(--accent) 12%, transparent)}}.opt-correct{font-weight:700}.opt-wrong{border-color:var(--danger);background:var(--danger)}@supports (color:color-mix(in lab, red, red)){.opt-wrong{background:color-mix(in srgb, var(--danger) 10%, transparent)}}.tagok{color:var(--accent);margin-top:6px;font-size:13px;font-weight:700}.tagbad{color:var(--danger);margin-top:6px;font-size:13px;font-weight:700}.explain{background:var(--bg);border-radius:10px;margin-top:10px;padding:10px 12px;font-size:14px;line-height:1.6}.timer{z-index:10;text-align:center;color:var(--primary);background:var(--surface);border:1px solid var(--primary);border-radius:999px;margin-bottom:14px;padding:8px 14px;font-size:15px;font-weight:800;position:sticky;top:64px}.timer-low{color:var(--danger);border-color:var(--danger);background:var(--danger)}@supports (color:color-mix(in lab, red, red)){.timer-low{background:color-mix(in srgb, var(--danger) 8%, var(--surface))}}.result{text-align:center;padding:24px}.score-big{color:var(--primary);font-size:44px;font-weight:800}.lb-row{border:1px solid var(--border);background:var(--surface);border-radius:11px;align-items:center;gap:10px;margin-bottom:8px;padding:11px 13px;display:flex}.lb-me{border-color:var(--primary);background:var(--primary)}@supports (color:color-mix(in lab, red, red)){.lb-me{background:color-mix(in srgb, var(--primary) 8%, var(--surface))}}.lb-rank{color:var(--muted);min-width:38px;font-weight:800}.lb-name{flex:1;min-width:0;font-size:14px;font-weight:600}.lb-score{color:var(--primary);font-weight:800}.legend{color:var(--muted);flex-wrap:wrap;justify-content:center;gap:14px;margin-top:6px;font-size:12px;display:flex}.ldot{border-radius:50%;width:9px;height:9px;margin-right:5px;display:inline-block}.hbars{flex-direction:column;gap:12px;display:flex}.hbar-row{flex-direction:column;gap:5px;display:flex}.hbar-label{justify-content:space-between;font-size:13.5px;font-weight:600;display:flex}.hbar-track{background:var(--bg);border:1px solid var(--border);border-radius:999px;height:10px;overflow:hidden}.hbar-fill{border-radius:999px;height:100%;transition:width .4s}.weekbars{align-items:flex-end;gap:6px;height:110px;display:flex}.weekbar-col{flex-direction:column;flex:1;align-items:center;gap:4px;height:100%;display:flex}.weekbar-track{flex:1;align-items:flex-end;width:60%;display:flex}.weekbar-fill{background:var(--primary);border-radius:6px 6px 0 0;width:100%;min-height:2px;transition:height .4s}.weekbar-label{color:var(--muted);font-size:9.5px}.weak-foot{justify-content:space-between;align-items:center;display:flex}.mini-link{color:var(--primary);margin-left:12px;font-size:12.5px;font-weight:700;text-decoration:none}.nav-sep{background:var(--border);height:1px;margin:8px 6px}.admin-nav{flex-wrap:wrap;gap:4px;margin-left:12px;display:flex}.admin-link{color:var(--muted);border-radius:999px;padding:6px 12px;font-size:14px;font-weight:700;text-decoration:none}.admin-link:hover{background:var(--bg)}.admin-link-active{background:var(--primary);color:var(--primary-contrast)}.subject-dd{margin:6px 0 16px}.subject-dd-label{color:var(--muted);margin-bottom:6px;font-size:13px;font-weight:600;display:block}.select-wrap{max-width:360px;position:relative}.select-wrap .select{cursor:pointer;padding-right:38px}.select-caret{pointer-events:none;color:var(--muted);font-size:14px;position:absolute;top:50%;right:14px;transform:translateY(-50%)}.soon-tag{letter-spacing:.2px;background:var(--primary);border-radius:999px;margin-left:6px;padding:2px 9px;font-size:10.5px;font-weight:600;display:inline-block}@supports (color:color-mix(in lab, red, red)){.soon-tag{background:color-mix(in srgb, var(--primary) 12%, var(--surface))}}.soon-tag{color:var(--primary);border:1px solid var(--primary)}@supports (color:color-mix(in lab, red, red)){.soon-tag{border:1px solid color-mix(in srgb, var(--primary) 28%, transparent)}}.soon-tag{vertical-align:middle}.soon-note{color:var(--muted);font-size:12.5px;font-style:italic}.nav-leaf.soon-note{opacity:.8;padding:6px 14px 6px 40px}*{scrollbar-width:thin;scrollbar-color:var(--border) transparent}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:0 0}::-webkit-scrollbar-thumb{background:var(--border);border:2px solid var(--bg);border-radius:999px}::-webkit-scrollbar-thumb:hover{background:var(--muted)}::-webkit-scrollbar-corner{background:0 0}.rich{display:block}.rich-text{white-space:pre-wrap}.diagram{background:var(--primary);justify-content:center;margin:14px 0;padding:12px;display:flex}@supports (color:color-mix(in lab, red, red)){.diagram{background:color-mix(in srgb, var(--primary) 4%, var(--surface))}}.diagram{border:1px solid var(--border);color:var(--text);border-radius:14px}.diagram svg{width:100%;max-width:360px;height:auto}.interactive{border:1px solid var(--border);background:var(--primary);border-radius:14px;margin:14px 0}@supports (color:color-mix(in lab, red, red)){.interactive{background:color-mix(in srgb, var(--primary) 4%, var(--surface))}}.interactive{overflow:hidden}.interactive iframe{width:100%;display:block}.chat-wrap{flex-direction:column;max-width:680px;height:calc(100vh - 150px);display:flex}.chat-thread{flex:1;padding:4px 2px 12px;overflow-y:auto}.chat-empty{text-align:center;max-width:520px;margin:30px auto;line-height:1.7}.chat-row{margin-bottom:10px;display:flex}.chat-row.me{justify-content:flex-end}.chat-row.them{justify-content:flex-start}.chat-bubble{border-radius:16px;max-width:80%;padding:9px 13px;font-size:15px;line-height:1.45}.bubble-me{background:var(--primary);color:var(--primary-contrast,#fff);border-bottom-right-radius:4px}.bubble-them{background:var(--surface);color:var(--text);border:1px solid var(--border);border-bottom-left-radius:4px}.chat-who{color:var(--primary);margin-bottom:3px;font-size:11px;font-weight:800}.chat-body{white-space:pre-wrap;word-break:break-word}.chat-bar{background:var(--bg);align-items:flex-end;gap:8px;padding:10px 0 14px;display:flex;position:sticky;bottom:0}.chat-input{resize:vertical;border:1px solid var(--border);min-width:0;min-height:72px;max-height:160px;color:var(--text);background:var(--surface);border-radius:16px;flex:auto;padding:12px 15px;font-family:inherit;font-size:16px;line-height:1.5}.chat-send{border-radius:16px;flex:none;width:auto;min-height:48px;margin-top:0;padding:0 22px;font-size:15px}*{-webkit-tap-highlight-color:transparent}.opt-pick,.btn,.btn-outline,.btn-ghost,.skill-row,.chip,.icon-btn,a,button,label,select{touch-action:manipulation}.radio-dot{border:2px solid var(--border);border-radius:50%;flex:none;width:18px;height:18px;position:relative}.opt-selected .radio-dot{border-color:var(--primary)}.opt-selected .radio-dot:after{content:"";background:var(--primary);border-radius:50%;position:absolute;inset:3px}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}