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.faint{font-size:11px}.dk-main{flex:1;min-width:0;display:flex;flex-direction:column;overflow:hidden}.dk-topbar{display:flex;align-items:center;gap:16px;padding:16px 32px;background:var(--card);border-bottom:1px solid var(--line);flex-shrink:0}.dk-topbar h1{font-size:20px;flex:1}.dk-topbar .sub{font-size:13px;color:var(--ink-faint);font-weight:500}.dk-scroll{flex:1;overflow-y:auto;padding:28px 32px}.dk-content{max-width:1180px;margin:0 auto;width:100%}.dk-poweredby{text-align:center;font-size:11.5px;color:var(--ink-faint);padding-top:6px}.dk-greet{display:flex;align-items:center;gap:20px;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-deep) 100%);color:#fff;border-radius:22px;padding:26px 30px;margin-bottom:22px}.tier-a .dk-greet{background:linear-gradient(135deg,var(--amber) 0%,#d68a28 100%)}.dk-greet h2{font-size:26px;font-family:var(--font-display);margin-bottom:6px}.dk-greet p{margin:0;font-size:15px;color:#ffffffd9;line-height:1.5}.dk-greet .acts{display:flex;gap:10px;margin-left:auto;flex-shrink:0}.dk-grid{display:grid;gap:16px}.dk-grid.cols-3{grid-template-columns:repeat(3,1fr)}.dk-grid.cols-2{grid-template-columns:1fr 1fr}.dk-stat{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:20px 22px;display:flex;flex-direction:column;gap:4px}.dk-stat .v{font-family:var(--font-display);font-size:30px;font-weight:800;color:var(--accent)}.dk-stat .l{font-size:13px;color:var(--ink-soft);font-weight:600}.dk-section-title{font-family:var(--font-display);font-size:17px;font-weight:800;margin:26px 0 12px;display:flex;align-items:center;justify-content:space-between}.dk-section-title .faint{font-family:var(--font-body);font-weight:600}.dk-plan-row{display:flex;align-items:center;gap:14px;padding:16px 20px;border-bottom:1px solid var(--line)}.dk-plan-row:last-child{border-bottom:none}.dk-plan-row .ic{width:34px;height:34px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0;background:var(--accent-soft);color:var(--accent);font-weight:800}.dk-plan-row.done .ic{background:var(--green-soft);color:var(--green)}.dk-plan-row .grow{flex:1;min-width:0}.dk-plan-row .grow b{font-size:14.5px}.dk-plan-row.done .grow b{color:var(--ink-faint);text-decoration:line-through}.dk-subject-tile{display:flex;align-items:center;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;text-align:left;width:100%;transition:transform .08s,border-color .12s}.dk-subject-tile:hover{transform:translateY(-2px);border-color:var(--accent)}.dk-subject-tile .badge{width:40px;height:40px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:18px;font-weight:800;background:var(--accent-soft);color:var(--accent);flex-shrink:0}.dk-chat{flex:1;display:grid;grid-template-columns:1fr 320px;min-height:0}.dk-chat-main{display:flex;flex-direction:column;min-width:0;min-height:0}.dk-chat-main .chat-list{padding:24px 32px}.dk-chat-main .bubble{max-width:72%;font-size:15px}.dk-rail{border-left:1px solid var(--line);background:var(--card);padding:22px 20px;overflow-y:auto;display:flex;flex-direction:column;gap:22px}.dk-rail h4{font-size:11.5px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-faint);margin:0 0 10px}.dk-rail-card{background:var(--bg);border:1px solid var(--line);border-radius:14px;padding:14px 16px}.dk-rail-step{display:flex;align-items:center;gap:10px;padding:8px 0;font-size:14px}.dk-rail-step .n{width:22px;height:22px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:12px;font-weight:800;flex-shrink:0;background:var(--accent);color:#fff}.dk-rail-step.done .n{background:var(--green)}.dk-pr{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:start}.dk-drop{border:2px dashed var(--accent);border-radius:20px;background:var(--accent-soft);padding:56px 32px;text-align:center;cursor:pointer;transition:background .15s}.dk-drop.over{background:var(--primary-soft);border-color:var(--primary)}.dk-lesson{display:grid;grid-template-columns:280px 1fr;gap:24px;align-items:start}.dk-tree{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px;position:sticky;top:0}.dk-tree .chap{font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.03em;color:var(--ink-faint);padding:14px 10px 6px}.dk-tree-item{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:10px;font-size:14px;font-weight:600;color:var(--ink-soft);background:none;text-align:left;width:100%}.dk-tree-item:hover{background:var(--bg)}.dk-tree-item.active{background:var(--accent-soft);color:var(--accent);font-weight:800}.dk-tree-item.done{color:var(--green)}.dk-quiz{max-width:640px;margin:0 auto}.dk-option{display:flex;align-items:center;gap:14px;width:100%;text-align:left;background:var(--card);border:1.5px solid var(--line);border-radius:14px;padding:16px 18px;font-size:16px;font-weight:600;margin-bottom:12px;transition:border-color .12s,background .12s}.dk-option:hover:not(:disabled){border-color:var(--accent)}.dk-option .key{width:30px;height:30px;border-radius:9px;display:flex;align-items:center;justify-content:center;font-weight:800;background:var(--bg);flex-shrink:0}.dk-option.correct{border-color:var(--green);background:var(--green-soft)}.dk-option.correct .key{background:var(--green);color:#fff}.dk-option.wrong{border-color:var(--danger);background:var(--danger-soft)}.dk-parent-children{display:flex;flex-direction:column;gap:6px}.dk-child-pick{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:12px;font-size:14px;font-weight:600;background:none;text-align:left;width:100%;color:var(--ink-soft)}.dk-child-pick:hover{background:var(--bg)}.dk-child-pick.active{background:var(--accent-soft);color:var(--accent);font-weight:800}.dk-attention{background:linear-gradient(135deg,var(--amber-soft) 0%,#fff 100%);border:1px solid var(--amber);border-radius:16px;padding:20px 22px}.dk-toggle{width:50px;height:29px;border-radius:999px;background:var(--line);position:relative;flex-shrink:0;transition:background .15s;border:none;cursor:pointer}.dk-toggle.on{background:var(--primary)}.dk-toggle:after{content:"";position:absolute;top:3px;left:3px;width:23px;height:23px;border-radius:50%;background:#fff;transition:transform .15s}.dk-toggle.on:after{transform:translate(21px)}.dk-toggle.locked{background:var(--green);opacity:.7;cursor:default}.dk-setting-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 20px;border-bottom:1px solid var(--line)}.dk-setting-row:last-child{border-bottom:none}.dk-pin-wrap{flex:1;display:flex;align-items:center;justify-content:center;background:var(--bg)}.dk-pin-card{background:var(--card);border:1px solid var(--line);border-radius:22px;padding:40px 44px;text-align:center;box-shadow:0 8px 40px #232a3d1a;width:380px;max-width:90vw}