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ease}.stat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md)}.stat-card-blue{background:var(--glass-gradient-blue)}.stat-card-mint{background:var(--glass-gradient-mint)}.stat-card-orange{background:var(--glass-gradient-orange)}.stat-card-purple{background:var(--glass-gradient-purple)}.stat-card-pink{background:var(--glass-gradient-pink)}.stat-num{display:block;font-size:32px;font-weight:600;line-height:1.1;letter-spacing:-.025em;color:var(--text-primary);margin-bottom:2px}.stat-label{font-size:13px;color:var(--text-secondary);font-weight:400}.page-container{max-width:800px;margin:0 auto;padding:16px;min-height:100dvh}.page-header{display:flex;align-items:center;gap:12px;padding:16px 0}.page-header h1{font-size:1.5rem;font-weight:700}.back-btn{width:36px;height:36px;border-radius:50%;border:1px solid var(--border);background:var(--bg-card);display:flex;align-items:center;justify-content:center;font-size:1.2rem;cursor:pointer;transition:all .2s ease}.back-btn:hover{background:var(--bg-page)}.empty-state{text-align:center;padding:48px 24px;color:var(--text-muted)}.empty-state .icon{font-size:3rem;margin-bottom:12px}.loading-spinner{display:flex;justify-content:center;padding:24px}.spinner{width:32px;height:32px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}.error-message{color:var(--danger);background:#ff3b300f;padding:12px 16px;border-radius:var(--radius-sm);font-size:14px}.tag{display:inline-block;padding:2px 8px;border-radius:4px;font-size:12px;font-weight:500;background:var(--primary-bg);color:var(--primary)}.difficulty-dots{display:flex;gap:3px}.difficulty-dots .dot{width:8px;height:8px;border-radius:50%;background:var(--border)}.difficulty-dots .dot.filled{background:var(--warning)}.student-layout{display:flex;min-height:100vh;background:var(--bg-page)}.desktop-sidebar{display:none;width:var(--sidebar-width);flex-shrink:0;background:var(--sidebar-bg);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-right:.5px solid var(--sidebar-border);flex-direction:column;position:sticky;top:0;height:100vh;overflow-y:auto;z-index:100}.sidebar-brand{display:flex;align-items:center;gap:10px;padding:20px 18px 16px;cursor:pointer;border-bottom:.5px solid var(--sidebar-border)}.brand-icon{font-size:1.4rem}.brand-text{font-size:15px;font-weight:600;color:var(--text-primary);letter-spacing:-.01em}.sidebar-nav{flex:1;padding:8px 10px;display:flex;flex-direction:column;gap:2px}.sidebar-item{display:flex;align-items:center;gap:10px;width:100%;padding:8px 12px;border:none;border-radius:var(--radius-sm);background:transparent;font-size:14px;color:var(--sidebar-text);cursor:pointer;transition:background .15s ease;border-left:3px solid transparent}.sidebar-item:hover{background:var(--sidebar-hover)}.sidebar-item.active{background:var(--sidebar-active-bg);color:var(--sidebar-active);font-weight:500;border-left-color:var(--sidebar-active)}.sidebar-footer{padding:12px 10px;border-top:.5px solid var(--sidebar-border);position:relative}.sidebar-user{display:flex;align-items:center;gap:10px;padding:8px;border-radius:10px;cursor:pointer;transition:background .15s ease}.sidebar-user:hover{background:var(--sidebar-hover)}.user-avatar{width:34px;height:34px;border-radius:50%;background:var(--gradient-blue);color:#fff;display:flex;align-items:center;justify-content:center;font-size:.95rem;font-weight:600;flex-shrink:0}.user-name{font-size:14px;font-weight:600;color:var(--text-primary)}.user-role{font-size:12px;color:var(--text-muted)}.main-area{flex:1;display:flex;flex-direction:column;min-width:0}.mobile-topbar{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;background:var(--sidebar-bg);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:.5px solid var(--border);position:sticky;top:0;z-index:100}.topbar-title{font-weight:700;font-size:16px;color:var(--text-primary)}.avatar-btn{width:34px;height:34px;border-radius:50%;background:var(--gradient-blue);color:#fff;border:none;font-weight:600;font-size:.9rem;cursor:pointer}.main-content{flex:1;overflow-y:auto;padding:16px 16px 76px}.mobile-tabs{display:flex;justify-content:space-around;background:var(--sidebar-bg);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-top:.5px solid var(--border);padding:6px 0 env(safe-area-inset-bottom,6px);position:fixed;bottom:0;left:0;right:0;z-index:100}.tab-item{display:flex;flex-direction:column;align-items:center;gap:2px;padding:4px 0;background:none;border:none;border-radius:0;font-size:11px;color:var(--text-muted);cursor:pointer;min-width:56px;transition:color .15s ease}.tab-item.active{color:var(--primary);font-weight:600}.tab-icon{font-size:1.2rem}.user-dropdown{position:absolute;bottom:60px;left:10px;width:200px;padding:14px;z-index:200;background:var(--bg-card);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);border:.5px solid var(--border)}.dropdown-name{font-weight:600;font-size:14px}.dropdown-email{font-size:13px;color:var(--text-muted);margin-top:2px}hr{border:none;border-top:.5px solid var(--border);margin:10px 0}.dropdown-item{display:block;width:100%;text-align:left;padding:8px;background:none;border:none;font-size:14px;cursor:pointer;color:var(--text-primary);border-radius:6px;transition:background .15s ease}.dropdown-item:hover{background:var(--sidebar-hover)}.dropdown-item.danger{color:var(--danger)}@media (min-width: 768px){.desktop-sidebar{display:flex}.mobile-topbar,.mobile-tabs{display:none}.main-content{padding:24px 32px}}.home-welcome{margin-bottom:24px}.home-welcome h2{font-size:var(--text-heading);font-weight:700}.home-welcome p{color:var(--text-secondary);font-size:var(--text-body);margin-top:4px}.home-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:24px}.home-stat-card{text-align:center;padding:18px 12px}.home-stat-card .stat-num{font-size:1.6rem;font-weight:700;color:var(--primary);letter-spacing:-.02em}.home-stat-card .stat-label{font-size:12px;color:var(--text-muted);margin-top:2px}.quick-actions{margin-bottom:24px}.quick-actions .btn-primary{width:100%}.session-list-card{padding:14px 16px;margin-bottom:10px;cursor:pointer}.session-list-card .sess-meta{display:flex;justify-content:space-between;align-items:center}.session-list-card .sess-date{font-size:12px;color:var(--text-muted)}.retry-btn{margin-left:10px;padding:4px 12px;font-size:13px}.empty-text{font-size:15px;color:var(--text-secondary)}.weak-kp-list{margin-bottom:24px}.weak-kp-item{padding:10px 14px;margin-bottom:6px;background:#ff3b300d;border-radius:var(--radius-sm);border-left:3px solid var(--danger);font-size:14px;display:flex;justify-content:space-between}.page-title{font-size:1.5rem;font-weight:700;margin-bottom:16px}.profile-card{display:flex;align-items:center;gap:14px;padding:20px;margin-bottom:16px}.profile-card .avatar{width:56px;height:56px;border-radius:50%;background:var(--gradient-blue);color:#fff;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:600}.profile-card .name{font-weight:600}.profile-card .grade{color:var(--text-muted);font-size:13px}.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:20px}.section-title{font-size:13px;font-weight:600;color:var(--text-muted);padding:8px 0;text-transform:uppercase;letter-spacing:.04em}.menu-list{overflow:hidden;margin-bottom:16px}.menu-item{display:flex;justify-content:space-between;width:100%;padding:14px 16px;background:none;border:none;border-bottom:.5px solid var(--border);border-radius:0;font-size:15px;cursor:pointer;color:var(--text-primary);transition:background .15s ease}.menu-item:last-child{border-bottom:none}.menu-item:hover{background:var(--sidebar-hover)}.logout-btn{width:100%;margin-top:8px;color:var(--danger);border-color:var(--danger)}.section{margin-bottom:24px}.section h3{font-size:13px;font-weight:600;color:var(--text-muted);margin-bottom:10px;text-transform:uppercase;letter-spacing:.04em}.volume-group,.count-group{display:flex;gap:8px}.btn-volume,.btn-count{flex:1;padding:10px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-card);color:var(--text-primary);font-size:14px;text-align:center;cursor:pointer;transition:all .2s ease}.btn-volume.active,.btn-count.active{background:var(--primary-bg);color:var(--primary);border-color:var(--primary)}.kp-tree{max-height:300px;overflow-y:auto}.domain-group{margin-bottom:8px}.domain-toggle{width:100%;text-align:left;padding:8px 0;background:none;border:none;cursor:pointer;font-weight:600;font-size:14px;color:var(--text-primary);display:flex;justify-content:space-between}.module-group{padding-left:12px}.module-name{font-size:12px;color:var(--text-muted);margin:6px 0 4px}.kp-checkbox{display:flex;align-items:center;gap:6px;padding:4px 0;font-size:13px;cursor:pointer;color:var(--text-primary)}.kp-checkbox input{width:auto}.start-btn{width:100%;padding:14px;font-size:17px;margin-top:12px}.progress-wrapper{margin-bottom:16px}.progress-text{font-size:13px;color:var(--text-secondary);margin-bottom:6px}.progress-track{height:6px;background:var(--border);border-radius:3px;overflow:hidden}.progress-fill{height:100%;background:var(--gradient-blue);border-radius:3px;transition:width .5s var(--ease-out)}.practice-card{padding:20px;margin-bottom:16px}.practice-header{display:flex;align-items:center;gap:10px;margin-bottom:14px}.source-tag{font-size:12px;color:var(--text-muted)}.answer-area{margin-top:20px;padding-top:16px;border-top:.5px solid var(--border)}.submit-btn{display:block;width:auto;max-width:360px;margin:16px auto 0;padding:12px 32px}.result-area{margin-top:20px;padding-top:16px;border-top:.5px solid var(--border)}.result-banner{padding:14px;border-radius:var(--radius-sm);font-weight:600;font-size:15px;display:flex;align-items:center;gap:8px}.result-banner.correct{background:#34c75914;color:#1a8a3f}.result-banner.incorrect{background:#ff3b3014;color:#cc1a1a}.result-icon{font-size:1.2rem}.correct-answer{margin-top:10px;padding:10px 14px;background:var(--bg-page);border-radius:var(--radius-sm)}.correct-answer .label{font-size:12px;color:var(--text-muted)}.nav-bar{display:flex;gap:12px;padding:8px 0 24px}.nav-spacer{flex:1}.complete-btn{background:var(--success)}.complete-btn:hover{opacity:.9}.choice-group{display:flex;flex-direction:column;gap:10px}.choice-btn{padding:14px;border:2px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-card);color:var(--text-primary);font-size:15px;cursor:pointer;transition:all .2s ease;display:flex;align-items:center;gap:10px;min-height:52px}.choice-btn:hover{border-color:var(--primary-light)}.choice-btn.selected{border-color:var(--primary);background:var(--primary-bg);color:var(--primary)}.choice-label{font-weight:700;font-size:1.1rem;min-width:24px;text-align:center}.fill-input{width:100%;padding:12px 14px;font-size:15px}.solve-textarea{width:100%;padding:12px 14px;font-size:15px;resize:vertical;min-height:120px}.photo-upload{display:flex;align-items:center;gap:10px;margin-top:10px}.photo-name{font-size:13px;color:var(--text-muted)}.score-section{text-align:center;padding:24px 0}.score-circle{width:120px;height:120px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto 12px;background:var(--gradient-blue)}.score-num{font-size:1.8rem;font-weight:700;color:#fff}.score-stats{color:var(--text-secondary);font-size:15px}.review-card{margin-bottom:10px;padding:14px 16px;cursor:pointer}.review-header{display:flex;align-items:center;gap:8px;font-size:14px}.result-dot{width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:.8rem;font-weight:700;color:#fff;flex-shrink:0}.result-dot.correct{background:var(--success)}.result-dot.incorrect{background:var(--danger)}.review-header .arrow{margin-left:auto;color:var(--text-muted)}.review-detail{margin-top:12px;padding-top:12px;border-top:.5px solid var(--border)}.answer-compare{margin-top:10px;font-size:14px}.answer-compare p{margin-bottom:4px}.text-correct{color:#1a8a3f;font-weight:600}.text-incorrect{color:#cc1a1a;text-decoration:line-through}.action-bar{display:flex;gap:12px;padding:16px 0 24px}.action-bar .btn-primary{flex:1;padding:12px}.mastery-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:20px}.mastery-stat-card{text-align:center}.mastery-stat-card .stat-value{font-size:1.6rem;font-weight:700;color:var(--primary);letter-spacing:-.02em}.mastery-stat-card .stat-label{font-size:12px;color:var(--text-muted);margin-top:2px}.mastery-row{padding:12px 14px;margin-bottom:8px;border-radius:var(--radius-sm);background:var(--bg-card);border-left:3px solid var(--border);transition:box-shadow .2s ease}.mastery-row:hover{box-shadow:var(--shadow-sm)}.mastery-row.red{background:#ff3b300a;border-left-color:var(--danger)}.mastery-row.yellow{background:#ff95000a;border-left-color:var(--warning)}.mastery-row.green{background:#34c7590a;border-left-color:#1a8a3f}.mastery-row-header{display:flex;align-items:center;justify-content:space-between}.mastery-row-header .kp-name{font-weight:600;font-size:14px}.mastery-row-header .kp-domain{font-size:12px;color:var(--text-muted)}.mastery-row-header .kp-level{font-weight:700;font-size:15px}.mastery-bar-bg{height:6px;border-radius:3px;background:var(--border);margin-top:8px;overflow:hidden}.mastery-bar-fill{height:100%;border-radius:3px;transition:width .5s var(--ease-out)}.mastery-detail{margin-top:8px;font-size:12px;color:var(--text-muted);display:flex;gap:16px}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;background:var(--bg-primary)}.auth-card{width:100%;max-width:420px;padding:36px 32px;background:var(--glass-white);backdrop-filter:blur(var(--glass-blur));-webkit-backdrop-filter:blur(var(--glass-blur));border:.5px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);animation:fadeUp .5s var(--ease-out) both}.auth-card h2{font-size:var(--text-heading);font-weight:700;text-align:center;margin-bottom:6px}.auth-subtitle{text-align:center;font-size:var(--text-caption);color:var(--text-secondary);margin-bottom:24px}.auth-card .form-group{margin-bottom:16px}.auth-card label{display:block;font-size:13px;font-weight:500;margin-bottom:6px;color:var(--text-secondary)}.auth-card input{width:100%;padding:12px 14px;font-size:15px}.auth-submit{width:100%;margin-top:8px;padding:14px;font-size:16px;font-weight:600}.auth-footer{text-align:center;margin-top:20px;font-size:14px;color:var(--text-secondary)}.auth-tabs{display:flex;margin-bottom:20px;background:#0000000a;border-radius:var(--radius-sm);padding:3px}.auth-tabs .tab{flex:1;text-align:center;padding:8px 0;font-size:14px;font-weight:500;cursor:pointer;border-radius:6px;border:none;background:transparent;color:var(--text-secondary);transition:all .2s ease}.auth-tabs .tab.active{background:var(--bg-card);color:var(--text-primary);box-shadow:0 1px 3px #00000014}.code-row{display:flex;gap:10px}.code-row input{flex:1}.code-btn{white-space:nowrap;min-width:110px;font-size:13px}.parent-layout{display:flex;min-height:100vh;background:var(--bg-page)}.child-selector{padding:12px 10px;border-bottom:.5px solid var(--sidebar-border)}.child-select{width:100%;padding:8px 10px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--bg-card);font-size:13px;color:var(--text-primary);cursor:pointer}.child-empty{text-align:center;padding:32px 16px;color:var(--text-muted)}.child-empty .icon{font-size:2.5rem;margin-bottom:10px}.child-empty p{font-size:14px;margin-bottom:16px}.child-loading{text-align:center;padding:32px 16px;color:var(--text-muted);font-size:14px}.dashboard-header{margin-bottom:24px}.dashboard-header h2{font-size:var(--text-heading);font-weight:700}.dashboard-header p{color:var(--text-secondary);font-size:var(--text-caption);margin-top:4px}.dashboard-stats{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin-bottom:24px}@media (min-width: 500px){.dashboard-stats{grid-template-columns:repeat(4,1fr)}}.dashboard-stat-card{text-align:center;padding:18px 10px}.dashboard-stat-card .stat-num{font-size:1.5rem;font-weight:700;color:var(--primary);letter-spacing:-.02em}.dashboard-stat-card .stat-label{font-size:11px;color:var(--text-muted);margin-top:2px}.chart-section{margin-bottom:24px;padding:20px}.chart-section h3{font-size:13px;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:12px}.bar-chart{display:flex;align-items:flex-end;gap:4px;height:120px;padding-top:8px}.bar-col{flex:1;display:flex;flex-direction:column;align-items:center;gap:4px;height:100%;justify-content:flex-end}.bar-fill{width:100%;max-width:32px;border-radius:4px 4px 0 0;background:var(--gradient-blue);min-height:2px;transition:height .5s var(--ease-out)}.bar-date{font-size:9px;color:var(--text-muted);transform:rotate(-45deg);white-space:nowrap;margin-top:4px}.empty-hint{text-align:center;color:var(--text-muted);font-size:14px;padding:24px}.empty-hint.positive{color:#1a8a3f}.session-card{padding:16px;margin-bottom:10px;cursor:pointer}.session-card .session-header{display:flex;justify-content:space-between;align-items:flex-start}.session-card .session-info{font-size:14px}.session-card .session-date{font-size:12px;color:var(--text-muted)}.session-card .session-stats{font-size:14px;font-weight:600;color:var(--primary)}.expand-arrow{display:inline-block;transition:transform .2s ease;font-size:12px}.expand-arrow.open{transform:rotate(180deg)}.plan-card{padding:16px;margin-bottom:10px}.plan-card .plan-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:12px}.plan-card .plan-kp-name{font-weight:600;font-size:14px}.plan-card .plan-domain{font-size:12px;color:var(--text-muted)}.plan-card .plan-fields{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.plan-card .plan-field{display:flex;flex-direction:column;gap:4px}.plan-card .plan-field label{font-size:11px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.03em}.plan-card .plan-field input,.plan-card .plan-field select{width:100%;padding:8px 10px;font-size:14px;text-align:center}.save-btn{width:100%;margin-top:16px}.empty-page{text-align:center;padding:64px 24px;color:var(--text-muted)}.empty-title{font-size:1.2rem;font-weight:600;margin-bottom:8px;color:var(--text-secondary)}.empty-page .btn-primary{margin-top:20px}.top-bar{position:fixed;top:0;left:0;right:0;z-index:100;height:48px;display:flex;align-items:center;justify-content:space-between;padding:0 16px;background:var(--sidebar-bg);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:.5px solid var(--border)}.top-bar-title{font-weight:700;font-size:16px;color:var(--primary)}.top-bar-right{display:flex;align-items:center;gap:10px}.bottom-tabs{position:fixed;bottom:0;left:0;right:0;z-index:100;height:60px;display:flex;background:var(--sidebar-bg);backdrop-filter:saturate(180%) blur(20px);-webkit-backdrop-filter:saturate(180%) blur(20px);border-top:.5px solid var(--border);padding-bottom:env(safe-area-inset-bottom)}.question-card{padding:20px;margin-bottom:16px}.question-content{font-size:15px;line-height:1.7;margin-bottom:14px}.question-meta{display:flex;gap:12px;flex-wrap:wrap;font-size:12px;color:var(--text-muted);margin-bottom:10px}.question-answer{margin-top:14px;padding:14px;background:var(--bg-page);border-radius:var(--radius-sm)}.question-answer .text-correct{color:#1a8a3f}.question-answer .text-incorrect{color:#cc1a1a}