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env(safe-area-inset-bottom,0px))}.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:var(--space-md)}.card-flat{box-shadow:none;background:var(--surface)}.grid{display:grid;gap:var(--space-md)}.grid-2{grid-template-columns:1fr}@media(min-width:640px){.grid-2{grid-template-columns:repeat(2,1fr)}}@media(min-width:960px){.grid-2{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}}.topbar{background:var(--card);border-bottom:1px solid var(--border);padding:var(--space-sm) 0;position:sticky;top:0;z-index:100}.topbar-inner{width:var(--container);margin:0 auto;display:flex;align-items:center;justify-content:space-between;gap:var(--space-sm)}.brand{font-weight:700;font-size:1.05rem;letter-spacing:-.02em}.nav-toggle{display:inline-flex;align-items:center;justify-content:center;min-width:var(--touch);min-height:var(--touch);padding:0;border:1px solid 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var(--space-sm)}body.nav-open{overflow:hidden}.back-link{display:inline-flex;align-items:center;min-height:var(--touch);font-size:.9rem;font-weight:600;margin-bottom:var(--space-xs)}.field-hint{margin:6px 0 0;font-size:.85rem}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.input-with-actions{position:relative}.input-with-actions .input{width:100%;padding-right:48px}.input-with-actions .input-actions{position:absolute;right:6px;top:50%;transform:translateY(-50%);display:flex;gap:2px}.input-with-actions .input-actions .icon-btn:only-child~.input,.input-with-actions:has(.icon-btn:only-child) .input{padding-right:44px}.input-with-actions:has(.icon-btn+.icon-btn) 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var(--border)}.nav-user-name{max-width:none;padding:var(--space-sm) var(--space-md)}.nav-links.open{transform:translate(0)}.nav-links a,.nav-links button{width:100%;justify-content:flex-start;padding:0 var(--space-md)}.nav-user{max-width:none;padding:var(--space-sm) var(--space-md)}}@media(min-width:768px){.nav-toggle{display:none}}.btn{border:none;border-radius:var(--radius-sm);padding:0 var(--space-md);min-height:var(--touch);font-weight:600;font-size:.95rem;cursor:pointer;background:var(--primary);color:#fff;display:inline-flex;align-items:center;justify-content:center;gap:var(--space-xs);transition:background .15s ease;touch-action:manipulation}.btn:hover{background:var(--primary-hover)}.btn:disabled{opacity:.55;cursor:not-allowed}.btn.secondary{background:var(--primary-soft);color:var(--primary)}.btn.secondary:hover{background:#d6e4ff}.btn.ghost{background:transparent;color:var(--muted);border:1px solid 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var(--border);border-radius:12px;background:#fff;flex-shrink:0}.lesson-group-header{width:100%;display:flex;flex-wrap:wrap;align-items:center;gap:8px 12px;padding:12px 14px;min-height:var(--touch);border:none;background:var(--surface);cursor:pointer;text-align:left;font:inherit;color:inherit;touch-action:manipulation}.lesson-group-header:hover{background:#f1f5f9}.lesson-group-chevron{flex:0 0 auto;font-size:.75rem;color:var(--muted, #64748b)}.lesson-group-title{flex:1 1 auto;font-weight:600;min-width:0}.lesson-group-badge{flex:0 0 auto;padding:2px 8px;border-radius:999px;background:var(--primary-soft);color:var(--primary);font-size:.75rem;font-weight:600}.lesson-group-meta{flex:1 1 100%;display:flex;gap:12px;font-size:.8rem;color:var(--muted, #64748b);padding-left:1.25rem}.lesson-group-body{display:flex;flex-direction:column;gap:12px;padding:12px 14px;border-top:1px solid var(--border);max-height:min(52vh,520px);overflow-y:auto;overflow-x:hidden;overscroll-behavior:contain;-webkit-overflow-scrolling:touch}.lesson-group.collapsed .lesson-group-body{display:none}.msg{max-width:85%;padding:12px 14px;border-radius:12px;white-space:pre-wrap}.msg.user{align-self:flex-end;background:var(--primary);color:#fff}.msg.assistant{align-self:flex-start;background:#f1f5f9;border:1px solid var(--border)}.msg.thinking{align-self:flex-start;background:#fff7ed;border:1px dashed #fdba74;color:#9a3412;font-size:.9rem}.voice-permission-banner{margin-top:var(--space-sm);padding:var(--space-sm) var(--space-md);border:1px solid #93c5fd;border-radius:var(--radius);background:#eff6ff;font-size:.92rem}.voice-permission-banner p{margin:0 0 var(--space-sm)}.voice-perm-hint{margin:var(--space-sm) 0 0!important;font-size:.85rem}.voice-toolbar{display:flex;flex-wrap:wrap;align-items:center;gap:var(--space-sm);margin-top:var(--space-sm)}.voice-mode-toggle{display:flex;flex-wrap:wrap;gap:6px}.voice-mode-toggle .btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}.voice-auto-speak{display:flex;align-items:center;gap:6px;font-size:.9rem;color:var(--muted);cursor:pointer}.btn-voice{min-width:var(--touch);font-size:1.25rem;line-height:1;padding:.5rem .75rem}.btn-voice.recording{background:#dc2626;border-color:#dc2626;color:#fff;animation:voice-pulse 1s ease-in-out infinite}.msg.assistant{display:flex;align-items:flex-start;gap:8px}.btn-msg-speak{flex-shrink:0;margin-left:auto;padding:2px 8px;border:1px solid var(--border);border-radius:6px;background:#fff;cursor:pointer;font-size:1rem;line-height:1.4}.btn-msg-speak:hover:not(:disabled){background:#eff6ff;border-color:#93c5fd}.btn-msg-speak:disabled{opacity:.5;cursor:not-allowed}@keyframes 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52px)}}.chat-page{flex:1;min-height:0;display:flex;flex-direction:column;overflow:hidden}.chat-mobile-head{flex-shrink:0;display:flex;align-items:center;justify-content:space-between;gap:var(--space-sm);padding:var(--space-sm) var(--space-md);border-bottom:1px solid var(--border);background:var(--card)}.chat-mobile-title{margin:0;font-size:1.05rem;font-weight:700}.chat-mobile-sub{margin:2px 0 0;font-size:.82rem}.chat-status-pill{flex-shrink:0;padding:4px 10px;border-radius:999px;font-size:.78rem;font-weight:600;background:#f1f5f9;color:var(--muted)}.chat-status-pill.online{background:#dcfce7;color:#166534}.chat-page .chat-layout{flex:1;min-height:0;gap:0;overflow:hidden}.chat-sidebar{display:none}.chat-panel{display:flex;flex-direction:column;min-height:0;flex:1;overflow:hidden;border-radius:0;box-shadow:none;border:none;border-top:1px solid var(--border);padding:0}.chat-page .chat-messages{flex:1;min-height:0;max-height:none;overflow-y:auto;padding:var(--space-sm) var(--space-md);-webkit-overflow-scrolling:touch}.chat-page .lesson-group-body{max-height:none;overflow:visible}.chat-page .lesson-group-header{flex-wrap:nowrap;gap:6px;padding:10px 12px}.chat-page .lesson-group-title{flex:1 1 auto;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:.92rem}.chat-page .lesson-group-meta{flex:0 0 auto;padding-left:0;margin-left:auto;font-size:.72rem;white-space:nowrap}.chat-panel-footer{flex-shrink:0;padding:var(--space-sm) var(--space-md) calc(var(--space-sm) + env(safe-area-inset-bottom,0px));border-top:1px solid var(--border);background:var(--card)}.chat-panel-footer .error{margin-bottom:var(--space-xs)}.chat-panel-footer .voice-permission-banner,.chat-panel-footer .voice-toolbar{margin-top:0;margin-bottom:var(--space-xs)}.chat-panel-footer .chat-input-row{margin-top:0}@media(min-width:900px){.chat-mobile-head{display:none}body.student-chat-page .container-chat{padding:var(--space-md) 0}.chat-page 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120px)}}.stat-value{font-size:1.6rem;font-weight:700}.stat-link{border:none;background:none;padding:0;margin:0;font:inherit;font-size:inherit;font-weight:inherit;color:var(--primary);cursor:pointer;text-decoration:underline;text-underline-offset:3px}.stat-link:hover{color:#2952c4}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:1000;background:#0f172a73;display:flex;align-items:center;justify-content:center;padding:20px}.modal-card{width:min(720px,100%);max-height:min(80vh,720px);overflow:hidden;display:flex;flex-direction:column;background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--border)}.modal-header{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 20px;border-bottom:1px solid var(--border)}.modal-body{overflow-y:auto;padding:16px 20px 20px;display:flex;flex-direction:column;gap:12px}.question-detail-item{border:1px solid var(--border);border-radius:12px;padding:12px 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var(--border);font-size:.92rem}.course-head{background:#f8fafc;font-weight:600;color:var(--muted);border-style:dashed}.course-row-completed{background:#f0fdf4;border-color:#bbf7d0}.course-row-planned{background:var(--primary-soft)}.course-row-lab{opacity:.92}.course-topic{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.badge{display:inline-block;padding:2px 8px;border-radius:999px;font-size:.75rem;font-weight:600;white-space:nowrap}.badge-completed{background:#dcfce7;color:#166534}.badge-planned{background:#dbeafe;color:#1d4ed8}.badge-upcoming{background:#f1f5f9;color:var(--muted)}.badge-repeat{background:#fef3c7;color:#92400e}.badge-lab{background:#ede9fe;color:#5b21b6}.course-repeat-item{display:flex;flex-wrap:wrap;gap:8px;align-items:baseline;padding:10px 0;border-bottom:1px solid 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0}.btn-link{border:none;background:none;padding:0;font:inherit;color:var(--primary);cursor:pointer;text-align:left}.btn.small,.btn.ghost.small{padding:4px 8px;font-size:.8rem;min-height:auto}.badge.danger{background:#fef2f2;color:#b91c1c}.badge.ok{background:#ecfdf5;color:#047857}.badge.muted{background:#f1f5f9;color:#64748b}.admin-table .pos{color:#047857;font-weight:600}.admin-table .neg{color:#b91c1c;font-weight:600}.admin-details code{font-size:.75rem;word-break:break-all}.admin-quick-links ul{margin:0;padding-left:20px}.chat-history-layout{margin-top:16px}.chat-history-mobile-tabs{display:none}.chat-history-tab{flex:1;min-height:var(--touch);border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--card);font:inherit;font-weight:600;color:var(--text);cursor:pointer}.chat-history-tab.active{background:var(--primary-soft);border-color:#93b4fd;color:var(--primary)}.chat-history-tab:disabled{opacity:.45;cursor:not-allowed}.chat-history-sessions{display:flex;flex-direction:column}.chat-history-session-list{display:flex;flex-direction:column;gap:8px;margin-top:8px}.chat-history-session-item{text-align:left;border:1px solid var(--border);border-radius:var(--radius-sm);padding:var(--space-sm);min-height:var(--touch);background:#fff;cursor:pointer;font:inherit;color:inherit;touch-action:manipulation}.chat-history-session-item:hover,.chat-history-session-item.active{border-color:var(--primary);background:var(--primary-soft)}.chat-history-session-title{font-weight:600;font-size:.92rem}.chat-history-session-meta{font-size:.8rem;color:var(--muted);margin-top:4px}.chat-history-session-preview{font-size:.82rem;color:var(--muted);margin-top:6px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chat-history-messages{display:flex;flex-direction:column}.chat-history-toolbar{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;margin-bottom:12px;padding-bottom:12px;border-bottom:1px solid var(--border)}.chat-history-nav{display:flex;align-items:center;gap:8px}.chat-history-thread{flex:1;max-height:none;min-height:0}.chat-messages.chat-history-thread{max-height:none;min-height:0;overflow:visible}.chat-history-time{font-size:.75rem;margin-bottom:4px}.msg.assistant_tools{align-self:flex-start;background:#f8fafc;border:1px dashed var(--border);color:var(--muted);font-size:.9rem;font-style:italic}.admin-filters{padding:12px;margin-bottom:8px}.admin-groups .admin-group{margin-bottom:8px;padding:8px 12px}.admin-groups summary{cursor:pointer;font-weight:600;padding:6px 0}@media(max-width:959px){.chat-history-layout{grid-template-columns:1fr!important}.chat-history-mobile-tabs{display:flex;gap:8px;margin-top:12px}.chat-history-pane-hidden-mobile{display:none!important}}@media(min-width:960px){.chat-history-layout{align-items:start}.chat-history-sessions{position:sticky;top:calc(var(--space-md) + 56px);max-height:calc(100dvh - 120px);overflow-y:auto}.chat-history-messages{min-height:320px}}.mod-stats-filters{display:flex;flex-wrap:wrap;gap:12px;align-items:flex-end;margin-top:12px}.mod-stats-filters label{display:flex;flex-direction:column;gap:4px;min-width:140px}.mod-chart{display:flex;flex-direction:column;gap:12px}.mod-chart-bars{display:flex;align-items:flex-end;gap:4px;overflow-x:auto;padding-bottom:4px;min-height:120px}.mod-chart-col{flex:1 1 12px;min-width:18px;max-width:36px;display:flex;flex-direction:column;align-items:center;gap:6px}.mod-chart-stack{width:100%;display:flex;flex-direction:column-reverse;justify-content:flex-start;border-radius:4px 4px 0 0;overflow:hidden;background:#f1f5f9;min-height:2px}.mod-chart-seg{width:100%;min-height:2px}.mod-chart-label{font-size:.65rem;color:var(--muted);writing-mode:horizontal-tb;text-align:center}.mod-chart-legend{display:flex;flex-wrap:wrap;gap:12px;font-size:.85rem;color:var(--muted)}.mod-chart-legend-item{display:inline-flex;align-items:center;gap:6px}.mod-chart-dot{width:10px;height:10px;border-radius:2px;display:inline-block}.billing-rules{background:var(--primary-soft, #eff6ff)}.billing-section-title{margin:0 0 6px;font-size:1.05rem}.billing-section-hint{margin:0 0 var(--space-md);font-size:.9rem}.billing-balance-card{display:flex;flex-direction:column;gap:var(--space-md)}.billing-balance-head{padding-bottom:var(--space-md);border-bottom:1px solid var(--border)}.billing-balance-label{display:block;font-size:.9rem;color:var(--muted);margin-bottom:4px}.billing-balance-amount{font-size:clamp(1.75rem,6vw,2.25rem);font-weight:700;letter-spacing:-.02em;line-height:1.15}.billing-topup{display:flex;flex-direction:column;gap:var(--space-sm)}.billing-preset-row{display:flex;flex-wrap:wrap;gap:8px}.billing-preset{flex:1 1 calc(50% - 4px);min-height:var(--touch);padding:0 12px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--card);font:inherit;font-weight:600;font-size:.95rem;color:var(--text);cursor:pointer}@media(min-width:480px){.billing-preset{flex:1 1 auto}}.billing-preset.active{border-color:var(--primary);background:var(--primary-soft);color:var(--primary)}.billing-amount-input-wrap{position:relative}.billing-amount-input{padding-right:36px}.billing-amount-suffix{position:absolute;right:14px;top:50%;transform:translateY(-50%);color:var(--muted);font-weight:600;pointer-events:none}.billing-topup-actions{display:flex;flex-direction:column;gap:8px;margin-top:4px}.billing-topup-actions .btn{width:100%}.billing-children-list{display:flex;flex-direction:column;gap:10px}.billing-child-row{padding:12px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface)}.billing-child-foot{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-top:8px;font-size:.9rem}.billing-child-select{max-width:320px;margin-bottom:var(--space-md)}.product-grid{display:grid;grid-template-columns:1fr;gap:var(--space-md);align-items:stretch}@media(min-width:560px){.product-grid{grid-template-columns:repeat(2,1fr)}}@media(min-width:960px){.product-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}}.product-card{display:flex;flex-direction:column;min-height:100%;padding:var(--space-md);border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface)}.product-card-body{flex:1 1 auto}.product-card-title{margin:0 0 8px;font-size:1.05rem}.product-card-desc{margin:0;font-size:.9rem;line-height:1.45}.product-card-price-block{margin-top:var(--space-md);padding-top:var(--space-md);border-top:1px solid var(--border)}.product-card-discount{margin:0 0 8px;font-size:.85rem}.product-card-price{display:flex;flex-wrap:wrap;align-items:baseline;gap:6px 8px;margin-bottom:12px}.product-card-price-old{text-decoration:line-through;font-size:.95rem}.product-card-price-main{font-size:1.35rem;font-weight:700}.product-card-price-period{font-size:.9rem}.product-card-btn{width:100%}.page-title-inline{margin:0 0 var(--space-sm);font-size:clamp(1.2rem,3.5vw,1.5rem);font-weight:700}.collapsible-section{padding:0;overflow:hidden}.collapsible-section-toggle{width:100%;display:flex;flex-wrap:wrap;align-items:center;gap:8px;min-height:var(--touch);padding:var(--space-md);border:none;background:transparent;font:inherit;text-align:left;cursor:pointer;color:inherit}.collapsible-section-chevron{flex:0 0 auto;color:var(--muted);font-size:.85rem}.collapsible-section-title{flex:1 1 auto;font-weight:700;font-size:1.05rem}.collapsible-section-hint{flex:1 1 100%;padding-left:1.25rem;font-size:.85rem}.collapsible-section-body{padding:0 var(--space-md) var(--space-md);border-top:1px solid var(--border)}.collapsible-pre{margin:var(--space-md) 0 0;white-space:pre-wrap;font-family:inherit;font-size:.9rem;line-height:1.45}@media(max-width:640px){.page-header-actions{width:100%;flex-direction:column;align-items:stretch}.page-header-actions .select,.page-header-actions .btn{width:100%}}