:root{--primary: #2D6A4F;--primary-dark: #1B4332;--primary-light: #D8F3DC;--primary-bg: rgba(45,106,79,.06);--accent: #D4A574;--accent-light: #FDF2E9;--success: #2D6A4F;--success-light: #D8F3DC;--warning: #B08968;--warning-light: #FDF2E9;--danger: #BC4749;--danger-light: #FEF2F2;--text: #2D3436;--text-secondary: #636E72;--text-light: #B2BEC3;--bg: #FAFAF5;--card: #FFFFFF;--border: #E8E4DE;--shadow-sm: 0 1px 3px rgba(45,52,54,.06);--shadow-md: 0 4px 12px rgba(45,52,54,.08);--shadow-lg: 0 8px 24px rgba(45,52,54,.1);--shadow-xl: 0 16px 40px rgba(45,52,54,.12);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--radius-xl: 20px;--radius-2xl: 28px;--sidebar-bg: #2D3436;--sidebar-hover: rgba(255,255,255,.08);--sidebar-active: rgba(45,106,79,.35)}body.dark-mode{--primary: #52B788;--primary-dark: #40916C;--primary-light: rgba(82,183,136,.12);--primary-bg: rgba(82,183,136,.08);--accent: #D4A574;--accent-light: rgba(212,165,116,.1);--success: #52B788;--success-light: rgba(82,183,136,.12);--warning: #D4A574;--warning-light: rgba(212,165,116,.1);--danger: #E07A7C;--danger-light: rgba(224,122,124,.1);--text: #ECEBE4;--text-secondary: #A8A29E;--text-light: #78716C;--bg: #1C1917;--card: #292524;--border: #44403C;--shadow-sm: 0 1px 3px rgba(0,0,0,.3);--shadow-md: 0 4px 12px rgba(0,0,0,.4);--shadow-lg: 0 8px 24px rgba(0,0,0,.5);--shadow-xl: 0 16px 40px rgba(0,0,0,.5);--sidebar-bg: #1C1917;--sidebar-hover: rgba(255,255,255,.06);--sidebar-active: rgba(82,183,136,.2)}body.dark-mode .sidebar{background:var(--sidebar-bg)}body.dark-mode .nav-item:not(.active){color:var(--text-secondary)}body.dark-mode .nav-item:not(.active):hover{background:var(--sidebar-hover);color:var(--text)}body.dark-mode .admin-item{background:var(--card);border:1px solid var(--border)}body.dark-mode input,body.dark-mode textarea,body.dark-mode select{color:var(--text);background:var(--card)}body.dark-mode .login-card{background:var(--card);color:var(--text)}body.dark-mode .input-field,body.dark-mode .form-input{background:var(--sidebar-bg);color:var(--text);border-color:var(--border)}body.dark-mode .input-field:focus,body.dark-mode .form-input:focus{border-color:var(--primary);background:var(--sidebar-bg);box-shadow:0 0 0 3px #52b78826}body.dark-mode .captcha-image{border-color:var(--border)}body.dark-mode .error-message{background:var(--danger-light);border-color:#e07a7c4d;color:#fca5a5}body.dark-mode .success-banner{background:var(--success-light);border-color:#52b7884d;color:#6ee7b7}body.dark-mode .btn-secondary:hover{background:var(--primary-bg)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Outfit,Noto Sans SC,-apple-system,BlinkMacSystemFont,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;line-height:1.6;-webkit-font-smoothing:antialiased}.login-container{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px;position:relative;overflow:hidden;background:#22303c url("login-bg.a88024d140.jpg") center/cover no-repeat}.login-container:before{content:"";position:absolute;inset:0;z-index:0;background:linear-gradient(105deg,#0a1626bd,#0a162675 45%,#0a162642)}body.dark-mode .login-container{background-color:#101a24}.login-brand{position:absolute;top:34px;left:42px;z-index:2;display:flex;align-items:center;gap:13px;color:#fff;text-shadow:0 2px 14px rgba(0,0,0,.45)}.login-brand-icon{width:46px;height:46px;flex-shrink:0;border-radius:12px;background:#ffffff2e;border:1px solid rgba(255,255,255,.3);backdrop-filter:blur(6px);box-shadow:0 6px 18px #0003}.login-brand-name{font-size:23px;font-weight:800;letter-spacing:2px;line-height:1.15}.login-brand-sub{font-size:12.5px;letter-spacing:2.5px;opacity:.85}.login-copyright{position:absolute;left:0;right:0;bottom:20px;z-index:2;text-align:center;font-size:12px;letter-spacing:.4px;color:#ffffffd1;text-shadow:0 1px 10px rgba(0,0,0,.45)}.login-form-wrapper{flex:1;display:flex;align-items:center;justify-content:center;padding:40px;position:relative;z-index:2}.login-form-wrapper .login-card{max-width:400px;width:100%;background:var(--card);padding:30px 32px 26px;border-radius:20px;box-shadow:0 26px 60px #0812204d}@media(min-width:1100px){.login-form-wrapper{justify-content:flex-end;padding-right:7vw}}.login-card{background:var(--card);border-radius:var(--radius-xl);padding:32px 36px;width:100%;max-width:400px;box-shadow:var(--shadow-md);position:relative;z-index:1}.theme-switch-btn{position:absolute;top:14px;right:14px;width:36px;height:36px;border-radius:50%;border:1px solid var(--border);background:var(--bg);color:var(--text-secondary);cursor:pointer;font-size:16px;display:flex;align-items:center;justify-content:center;transition:all .2s ease;font-family:inherit}.theme-switch-btn:hover{border-color:var(--primary);color:var(--primary)}.auth-tabs{display:flex;justify-content:center;gap:24px;margin-bottom:22px}.auth-tabs button{background:none;border:none;padding:8px 4px;font-size:15px;font-weight:600;color:var(--text-light);border-bottom:2px solid transparent;cursor:pointer;transition:color .2s ease,background .2s ease,border-radius .2s ease;font-family:inherit;border-radius:8px 8px 0 0}.auth-tabs button:hover{color:var(--text);background:var(--bg)}.auth-tabs button.active{color:var(--primary);background:var(--primary-bg);border-bottom-color:var(--primary)}body.dark-mode .auth-tabs button.active{background:transparent}.login-type-switch{display:flex;gap:8px;margin-bottom:16px}.login-type-switch .tab-btn{flex:1;padding:10px;font-size:13px}.login-title{font-size:24px;font-weight:800;color:var(--text);text-align:center;margin-bottom:4px}.login-subtitle{font-size:14px;color:var(--text-secondary);text-align:center;margin-bottom:22px}.form-group{margin-bottom:16px}.form-label{display:block;font-size:13px;font-weight:600;color:var(--text);margin-bottom:7px}.form-input{width:100%;height:44px;padding:0 14px;border:1.5px solid var(--border);border-radius:var(--radius-md);font-size:14px;font-family:inherit;outline:none;transition:border-color .2s ease,box-shadow .2s ease;background:var(--bg);box-sizing:border-box;color:var(--text)}.form-input:focus{border-color:var(--primary);background:var(--card);box-shadow:0 0 0 3px var(--primary-bg)}.form-input::placeholder{color:var(--text-light)}.captcha-group{display:flex;gap:10px}.captcha-group .form-input{flex:1}.captcha-image{height:46px;border-radius:var(--radius-md);cursor:pointer;border:2px solid var(--border);transition:all .2s}.captcha-image:hover{border-color:var(--primary)}.form-options{display:flex;align-items:center;justify-content:space-between;margin-bottom:18px}.login-card.wide{max-width:500px;padding:26px 30px 22px}.compact-layout .login-title{font-size:22px;margin-bottom:4px}.compact-layout .login-subtitle{font-size:13px;margin-bottom:18px}.compact-layout .form-group{margin-bottom:12px}.compact-layout .form-label{font-size:12px;margin-bottom:5px}.compact-layout .form-input{height:40px;font-size:13px;padding:0 14px}.compact-layout .captcha-image{height:40px}.form-section{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-lg);padding:16px 18px;margin-bottom:14px}body.dark-mode .form-section{background:#ffffff08}.form-section-title{display:flex;align-items:center;gap:8px;font-size:12.5px;font-weight:700;color:var(--text);margin-bottom:12px}.form-section-title:before{content:"";width:3px;height:14px;background:var(--primary);border-radius:2px}.form-two-col{display:grid;grid-template-columns:1fr 1fr;gap:10px 14px}.form-two-col .form-group{margin-bottom:0}.form-two-col .form-group.full-width{grid-column:1 / -1}.success-banner{background:var(--success-light);border:1px solid rgba(16,185,129,.3);color:#059669;padding:12px 16px;border-radius:var(--radius-md);margin-bottom:14px;font-size:13px;text-align:center;font-weight:500}.error-message{background:var(--danger-light);color:#dc2626;padding:10px 14px;border-radius:var(--radius-md);font-size:13px;margin:10px 0;text-align:center;border:1px solid rgba(239,68,68,.2)}.btn-primary{width:100%;height:44px;border:none;border-radius:var(--radius-md);font-size:15px;font-weight:600;font-family:inherit;cursor:pointer;transition:background-color .2s ease,transform .15s ease;display:flex;align-items:center;justify-content:center;gap:8px;background:var(--primary);color:#fff;margin-top:6px}.btn-primary:hover{background:var(--primary-dark)}.btn-primary:active{transform:scale(.98)}.btn-primary:active{transform:translateY(0)}.btn-primary:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn-primary span,.btn-primary .spinner{position:relative;z-index:1}.btn-secondary{width:100%;height:40px;margin-top:10px;background:transparent;border:1.5px solid var(--border);border-radius:var(--radius-md);color:var(--text-secondary);cursor:pointer;font-size:13px;font-family:inherit;font-weight:500;transition:all .2s ease}.btn-secondary:hover{border-color:var(--primary);color:var(--primary);background:var(--primary-bg)}.checkbox-label{display:flex;align-items:center;gap:7px;cursor:pointer;font-size:13px;color:var(--text-secondary)}.checkbox-label input[type=checkbox]{width:16px;height:16px;accent-color:var(--primary);cursor:pointer}.forgot-link{font-size:13px;color:var(--primary);text-decoration:none;font-weight:600;transition:all .2s}.forgot-link:hover{color:var(--primary-dark);transform:translateY(-1px)}.spinner{width:16px;height:16px;border:2.5px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .6s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.login-footer{text-align:center;margin-top:18px;padding-top:14px;border-top:1px solid var(--border);font-size:13px;color:var(--text-secondary)}.login-footer a{color:var(--primary);text-decoration:none;font-weight:600;transition:all .2s}.login-footer a:hover{color:var(--primary-dark)}@media(max-width:540px){.login-card.wide{max-width:100%;padding:24px 22px 20px}.form-two-col{grid-template-columns:1fr;gap:0}.form-two-col .form-group{margin-bottom:12px}}.dashboard{display:flex;min-height:100vh}.sidebar{width:240px;min-width:240px;background:var(--card);border-right:1px solid var(--border);display:flex;flex-direction:column;height:100vh;position:sticky;top:0;z-index:50}.sidebar-header{padding:24px 20px;border-bottom:1px solid var(--border)}.sidebar-logo{display:flex;align-items:center;gap:12px;text-decoration:none}.sidebar-logo-icon{width:40px;height:40px;background:var(--primary);border-radius:10px;display:flex;align-items:center;justify-content:center;color:#fff;font-size:20px}.sidebar-logo-text{font-size:18px;font-weight:700;color:var(--text)}.sidebar-nav{flex:1;padding:16px 12px;display:flex;flex-direction:column;gap:2px;overflow-y:auto}.nav-section-title{font-size:11px;font-weight:600;color:var(--text-light);text-transform:uppercase;letter-spacing:.5px;padding:14px 12px 6px}.nav-item{display:flex;align-items:center;gap:12px;padding:10px 12px;border-radius:var(--radius-md);color:var(--text-secondary);text-decoration:none;font-size:14px;font-weight:500;transition:background .15s ease,color .15s ease;cursor:pointer;border:none;background:none;width:100%;text-align:left}.nav-item:hover{background:var(--bg);color:var(--text)}.nav-item.active{background:var(--primary-light);color:var(--primary);font-weight:600}.nav-icon{width:20px;height:20px;display:flex;align-items:center;justify-content:center;font-size:18px}.nav-icon i{font-size:18px}.nav-badge{margin-left:auto;background:var(--danger);color:#fff;font-size:11px;font-weight:600;padding:2px 8px;border-radius:10px}.sidebar-footer{padding:14px 12px;border-top:1px solid var(--border)}.theme-toggle-btn{width:100%;display:flex;align-items:center;gap:10px;padding:10px 12px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-md);cursor:pointer;font-size:13px;color:var(--text-secondary);font-family:inherit;transition:background .15s ease;margin-bottom:10px}.theme-toggle-btn:hover{background:var(--primary-light);color:var(--primary);border-color:var(--primary)}.theme-toggle-btn .theme-icon{font-size:15px}.user-profile{display:flex;align-items:center;gap:12px;padding:12px;border-radius:var(--radius-md);cursor:pointer;transition:background .15s ease}.user-profile:hover{background:var(--bg)}.user-avatar{width:40px;height:40px;border-radius:10px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;flex-shrink:0}.user-info{flex:1;min-width:0}.user-name{font-size:14px;font-weight:600;color:var(--text);margin-bottom:1px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-role{font-size:12px;color:var(--text-secondary)}.logout-btn{display:flex;align-items:center;gap:10px;width:100%;padding:10px 12px;border:none;background:none;border-radius:var(--radius-md);font-size:14px;font-weight:500;color:var(--text-secondary);cursor:pointer;transition:background .15s ease,color .15s ease;margin-top:8px}.logout-btn:hover{background:var(--danger-light);color:var(--danger)}.main-content{flex:1;padding:36px 52px;max-width:1400px;margin:0 auto;width:100%}.page-header{margin-bottom:26px}.page-title{font-size:30px;font-weight:900;color:var(--text);margin-bottom:6px;letter-spacing:-1px}.page-subtitle{font-size:15px;color:var(--text-secondary)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:16px;margin-bottom:26px}.stat-card{background:var(--card);border-radius:var(--radius-lg);padding:18px 20px;box-shadow:var(--shadow-sm);transition:all .3s cubic-bezier(.16,1,.3,1);border:1px solid var(--border);position:relative;overflow:hidden}.stat-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px)}.stat-icon{width:44px;height:44px;border-radius:var(--radius-md);display:flex;align-items:center;justify-content:center;font-size:22px;margin-bottom:12px}.stat-icon.blue{background:#eff6ff;color:#3b82f6}.stat-icon.green{background:#ecfdf5;color:#059669}.stat-icon.purple{background:#f5f3ff;color:#7c3aed}.stat-icon.orange{background:#fff7ed;color:#ea580c}.stat-value{font-size:28px;font-weight:800;color:var(--text);line-height:1;margin-bottom:4px;letter-spacing:-1px}.stat-label{font-size:13px;color:var(--text-secondary);font-weight:500}.welcome-banner{background:var(--primary);border-radius:var(--radius-lg);padding:26px;color:#fff;margin-bottom:26px;position:relative;overflow:hidden}.welcome-content{position:relative;z-index:1}.welcome-title{font-size:26px;font-weight:700;margin-bottom:8px}.welcome-subtitle{font-size:15px;opacity:.9;margin-bottom:24px}.welcome-btn{background:#fff;color:var(--primary);padding:12px 28px;border-radius:var(--radius-md);font-weight:600;font-size:14px;border:none;cursor:pointer;transition:opacity .2s ease}.welcome-btn:hover{opacity:.9}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:16px}.section-title{font-size:20px;font-weight:800;color:var(--text);letter-spacing:-.3px}.category-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:16px;margin-bottom:26px}.category-card{background:var(--card);border-radius:var(--radius-lg);padding:20px 22px;box-shadow:var(--shadow-sm);transition:all .3s cubic-bezier(.16,1,.3,1);cursor:pointer;border:2px solid transparent;position:relative}.category-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-4px);border-color:var(--primary)}.category-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:14px}.category-icon{width:44px;height:44px;border-radius:var(--radius-md);background:var(--primary-light);display:flex;align-items:center;justify-content:center;font-size:23px}.category-badge{background:var(--warning-light);color:#b45309;font-size:12px;font-weight:700;padding:4px 11px;border-radius:999px}.category-name{font-size:17px;font-weight:800;color:var(--text);margin-bottom:6px;letter-spacing:-.2px}.category-meta{font-size:13px;color:var(--text-secondary);margin-bottom:14px}.category-progress{height:8px;background:var(--bg);border-radius:999px;overflow:hidden;margin-bottom:10px}.category-progress-bar{height:100%;background:var(--primary);border-radius:999px;transition:width .5s ease}.category-progress-text{display:flex;justify-content:space-between;font-size:13px;color:var(--text-secondary);font-weight:500}.empty-state{text-align:center;padding:52px 32px;background:var(--card);border-radius:var(--radius-lg);border:2px dashed var(--border)}.empty-icon{font-size:54px;margin-bottom:16px;opacity:.6}.empty-title{font-size:18px;font-weight:700;color:var(--text);margin-bottom:6px}.empty-subtitle{font-size:14px;color:var(--text-secondary);margin-bottom:22px}.btn{padding:12px 24px;border-radius:var(--radius-md);font-size:14px;font-weight:600;cursor:pointer;transition:all .2s ease;border:none;display:inline-flex;align-items:center;gap:8px}.btn-primary-2{background:var(--primary);color:#fff}.btn-primary-2:hover{background:var(--primary-dark)}.btn-secondary{background:var(--bg);color:var(--text);border:1px solid var(--border)}.btn-secondary:hover{background:var(--border)}.btn,.btn-primary,.btn-secondary,.action-btn{white-space:nowrap}.modal-overlay{position:fixed;inset:0;background:#2d343680;backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px;overflow-y:auto}.modal-content-2{background:var(--card);border-radius:var(--radius-xl);padding:28px;width:100%;max-width:480px;margin:auto;max-height:85vh;overflow-y:auto;box-shadow:var(--shadow-xl);animation:modalIn .3s cubic-bezier(.16,1,.3,1)}@keyframes modalIn{0%{opacity:0;transform:scale(.95) translateY(10px)}to{opacity:1;transform:scale(1) translateY(0)}}.modal-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:28px}.modal-title{font-size:22px;font-weight:800;color:var(--text);letter-spacing:-.3px}.modal-close{width:40px;height:40px;border-radius:var(--radius-md);border:none;background:var(--bg);color:var(--text-secondary);cursor:pointer;font-size:20px;transition:all .2s ease}.modal-close:hover{background:var(--danger-light);color:var(--danger)}.tabs-container{display:flex;gap:8px;margin-bottom:20px;background:var(--card);padding:6px;border-radius:var(--radius-md);box-shadow:var(--shadow-sm);width:fit-content;border:1px solid var(--border)}.tab-btn{padding:10px 22px;border:none;background:none;border-radius:var(--radius-sm);font-size:14px;font-weight:600;color:var(--text-secondary);cursor:pointer;transition:all .2s ease}.tab-btn:hover{color:var(--text);background:var(--bg)}.tab-btn.active{background:var(--primary);color:#fff}.flashcard-container{max-width:640px;margin:0 auto}.flashcard{background:var(--card);border-radius:var(--radius-xl);padding:64px 44px;box-shadow:var(--shadow-lg);margin-bottom:28px;min-height:320px;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;transition:all .3s cubic-bezier(.16,1,.3,1);cursor:pointer;perspective:1000px;border:1px solid var(--border);position:relative}.flashcard:hover{box-shadow:var(--shadow-lg)}.flashcard-text{font-size:28px;font-weight:800;color:var(--text);line-height:1.5;margin-bottom:16px;letter-spacing:-.3px}.flashcard-sub{font-size:16px;color:var(--text-secondary)}.flashcard-content{width:100%;text-align:center;padding:0 80px}.study-complete-overlay{position:fixed;inset:0;background:#0f172ab3;backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .3s ease}.study-complete-modal{background:var(--card);border-radius:var(--radius-2xl);padding:52px 60px;text-align:center;box-shadow:0 40px 80px 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.forgot-link,.login-footer{display:none}.btn-primary{height:40px;font-size:15px}.compact-layout .form-section{padding:12px 14px;margin-bottom:10px}.compact-layout .form-section-title{margin-bottom:8px}.login-copyright{display:none}}@media(display-mode:standalone){.mobile-topbar{height:calc(56px + env(safe-area-inset-top));padding:env(safe-area-inset-top) 14px 0}.main-content{padding-top:calc(74px + env(safe-area-inset-top))}}@media(max-width:400px){.page-title,.stat-value{font-size:21px}.tab-btn{padding:8px 12px;font-size:13px}.feedback-btn{padding:14px 6px;font-size:11px}.modal-content-2{padding:18px 14px}}