@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";:root{--color-primary: #2B5EAF;--color-primary-light: #4A7FD4;--color-primary-dark: #1E4280;--color-secondary: #E8B84B;--color-bg: #F7F8FC;--color-bg-card: #FFFFFF;--color-bg-sidebar: #1E2A3A;--color-text: #1A1D23;--color-text-secondary: #6B7280;--color-text-muted: #9CA3AF;--color-border: #E5E7EB;--color-success: #34C759;--color-error: #FF3B30;--color-warning: #FF9500;--color-der: #4A90D9;--color-die: #E05C5C;--color-das: #5CAE6A;--color-a1: #22C55E;--color-a2: #84CC16;--color-b1: #EAB308;--color-b2: #F97316;--color-c1: #EF4444;--color-c2: #8B5CF6;--font-family-base: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-size-xs: 12px;--font-size-sm: 14px;--font-size-base: 16px;--font-size-md: 18px;--font-size-lg: 20px;--font-size-xl: 24px;--font-size-2xl: 28px;--font-size-3xl: 32px;--font-size-4xl: 48px;--line-height-xs: 1.4;--line-height-sm: 1.43;--line-height-base: 1.5;--line-height-md: 1.56;--line-height-lg: 1.5;--line-height-xl: 1.33;--line-height-2xl: 1.29;--line-height-3xl: 1.25;--line-height-4xl: 1.17;--font-weight-regular: 400;--font-weight-medium: 500;--font-weight-semibold: 600;--font-weight-bold: 700;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 20px;--space-6: 24px;--space-8: 32px;--space-10: 40px;--space-12: 48px;--space-16: 64px;--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--radius-full: 9999px;--shadow-sm: 0 1px 3px rgba(0, 0, 0, .08), 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .1), 0 2px 4px rgba(0, 0, 0, .06);--shadow-lg: 0 10px 28px rgba(0, 0, 0, .12), 0 4px 10px rgba(0, 0, 0, .07);--transition-fast: .15s ease;--transition-base: .2s ease;--sidebar-width: 240px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);padding:var(--space-2) var(--space-4);height:40px;font-family:var(--font-family-base);font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);line-height:1;border:1.5px solid transparent;border-radius:var(--radius-sm);cursor:pointer;text-decoration:none;white-space:nowrap;transition:background-color var(--transition-fast),border-color var(--transition-fast),color var(--transition-fast),box-shadow var(--transition-fast),transform var(--transition-fast);-webkit-user-select:none;user-select:none;outline:none}.btn:focus-visible{box-shadow:0 0 0 3px #2b5eaf4d}.btn:active{transform:translateY(1px)}.btn:disabled,.btn[disabled]{opacity:.45;cursor:not-allowed;pointer-events:none}.btn-primary{background-color:var(--color-primary);border-color:var(--color-primary);color:#fff}.btn-primary:hover{background-color:var(--color-primary-light);border-color:var(--color-primary-light)}.btn-primary:active{background-color:var(--color-primary-dark);border-color:var(--color-primary-dark)}.btn-secondary{background-color:transparent;border-color:var(--color-primary);color:var(--color-primary)}.btn-secondary:hover{background-color:#2b5eaf12;border-color:var(--color-primary-light);color:var(--color-primary-light)}.btn-secondary:active{background-color:#2b5eaf24;border-color:var(--color-primary-dark);color:var(--color-primary-dark)}.btn-ghost{background-color:transparent;border-color:transparent;color:var(--color-text-secondary)}.btn-ghost:hover{background-color:#0000000d;color:var(--color-text)}.btn-ghost:active{background-color:#0000001a}.btn-danger{background-color:var(--color-error);border-color:var(--color-error);color:#fff}.btn-danger:hover{background-color:#e6342a;border-color:#e6342a}.btn-danger:active{background-color:#cc2e25;border-color:#cc2e25}.btn-sm{height:32px;padding:var(--space-1) var(--space-3);font-size:var(--font-size-xs);border-radius:var(--radius-sm)}.btn-lg{height:48px;padding:var(--space-3) var(--space-6);font-size:var(--font-size-base);border-radius:var(--radius-md)}.card{background-color:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:var(--space-6)}.card-hover{background-color:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:var(--space-6);cursor:pointer;transition:box-shadow var(--transition-base),transform var(--transition-base),border-color var(--transition-base)}.card-hover:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);border-color:#2b5eaf33}.card-hover:active{transform:translateY(0);box-shadow:var(--shadow-sm)}.label{display:block;font-family:var(--font-family-base);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:var(--color-text);margin-bottom:var(--space-1);line-height:var(--line-height-sm)}.input{display:block;width:100%;height:40px;padding:0 var(--space-3);font-family:var(--font-family-base);font-size:var(--font-size-sm);font-weight:var(--font-weight-regular);color:var(--color-text);background-color:var(--color-bg-card);border:1.5px solid var(--color-border);border-radius:var(--radius-sm);outline:none;transition:border-color var(--transition-fast),box-shadow var(--transition-fast);box-sizing:border-box}.input::placeholder{color:var(--color-text-muted)}.input:hover{border-color:var(--color-text-secondary)}.input:focus{border-color:var(--color-primary);box-shadow:0 0 0 3px #2b5eaf2e}.input:disabled{background-color:var(--color-bg);color:var(--color-text-muted);cursor:not-allowed}textarea.input{height:auto;padding:var(--space-2) var(--space-3);resize:vertical;line-height:var(--line-height-base)}.input-error,.input-error:hover{border-color:var(--color-error)}.input-error:focus{border-color:var(--color-error);box-shadow:0 0 0 3px #ff3b302e}.badge{display:inline-flex;align-items:center;justify-content:center;padding:2px var(--space-2);font-family:var(--font-family-base);font-size:var(--font-size-xs);font-weight:var(--font-weight-semibold);line-height:1.4;border-radius:var(--radius-full);white-space:nowrap;background-color:var(--color-border);color:var(--color-text-secondary)}.badge-primary{background-color:#2b5eaf1f;color:var(--color-primary)}.badge-success{background-color:#34c75924;color:#1a8c3c}.badge-warning{background-color:#ff950024;color:#b86b00}.badge-error{background-color:#ff3b301f;color:#d42b22}.avatar{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border-radius:var(--radius-full);background-color:var(--color-primary);color:#fff;font-family:var(--font-family-base);font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);line-height:1;overflow:hidden;flex-shrink:0;-webkit-user-select:none;user-select:none}.avatar img{width:100%;height:100%;object-fit:cover;display:block}.avatar-sm{width:28px;height:28px;font-size:var(--font-size-xs)}.avatar-lg{width:48px;height:48px;font-size:var(--font-size-base)}.sidebar{width:var(--sidebar-width);min-width:var(--sidebar-width);height:100vh;background-color:var(--color-bg-sidebar);display:flex;flex-direction:column;overflow-y:auto;overflow-x:hidden;padding:var(--space-4) 0;box-sizing:border-box;flex-shrink:0}.sidebar-item{display:flex;align-items:center;gap:var(--space-3);padding:var(--space-2) var(--space-4);margin:2px var(--space-2);font-family:var(--font-family-base);font-size:var(--font-size-sm);font-weight:var(--font-weight-medium);color:#ffffffa6;border-radius:var(--radius-sm);cursor:pointer;text-decoration:none;transition:background-color var(--transition-fast),color var(--transition-fast);-webkit-user-select:none;user-select:none;outline:none;border:none;background:transparent;width:calc(100% - var(--space-4));box-sizing:border-box}.sidebar-item:hover{background-color:#ffffff14;color:#ffffffe6}.sidebar-item-active{background-color:#4a7fd438;color:#fff;font-weight:var(--font-weight-semibold)}.sidebar-item-active:hover{background-color:#4a7fd44d;color:#fff}.page-layout{display:flex;flex-direction:row;height:100vh;width:100%;overflow:hidden;background-color:var(--color-bg)}.main-content{flex:1 1 0;min-width:0;height:100vh;overflow-y:auto;overflow-x:hidden;background-color:var(--color-bg);padding:var(--space-6) var(--space-8);box-sizing:border-box}.bottom-nav{display:none;position:fixed;bottom:0;left:0;right:0;height:60px;background-color:var(--color-bg-sidebar);border-top:1px solid rgba(255,255,255,.08);z-index:100;box-shadow:0 -2px 12px #0000002e}.bottom-nav-inner{display:flex;align-items:stretch;height:100%}.bottom-nav-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;background:none;border:none;cursor:pointer;padding:var(--space-1) var(--space-1);color:#ffffff8c;font-family:var(--font-family-base);font-size:10px;font-weight:var(--font-weight-medium);line-height:1.2;transition:color var(--transition-fast),background-color var(--transition-fast);min-height:44px;-webkit-tap-highlight-color:transparent}.bottom-nav-item:active{background-color:#ffffff0f}.bottom-nav-item.active{color:#fff}.bottom-nav-item.active .bottom-nav-icon{background-color:#4a7fd44d;border-radius:var(--radius-sm)}.bottom-nav-icon{width:28px;height:28px;display:flex;align-items:center;justify-content:center;font-size:18px;border-radius:var(--radius-sm);transition:background-color var(--transition-fast);padding:2px}.bottom-nav-label{font-size:10px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:56px}.mobile-header{display:none;position:fixed;top:0;left:0;right:0;height:52px;background-color:var(--color-bg-sidebar);z-index:99;align-items:center;justify-content:space-between;padding:0 var(--space-4);border-bottom:1px solid rgba(255,255,255,.08);box-shadow:0 2px 8px #00000026}.mobile-header-title{color:#fff;font-weight:var(--font-weight-bold);font-size:var(--font-size-base);letter-spacing:-.3px}.mobile-header-avatar{width:34px;height:34px;border-radius:var(--radius-full);background-color:var(--color-primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:var(--font-size-xs);font-weight:var(--font-weight-bold);cursor:pointer;border:none;-webkit-tap-highlight-color:transparent;transition:opacity var(--transition-fast);flex-shrink:0}.mobile-header-avatar:active{opacity:.75}.mobile-user-menu{position:fixed;top:52px;right:var(--space-4);min-width:200px;background-color:var(--color-bg-sidebar);border:1px solid rgba(255,255,255,.12);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);z-index:200;overflow:hidden;animation:menuFadeIn .15s ease}@keyframes menuFadeIn{0%{opacity:0;transform:translateY(-6px) scale(.97)}to{opacity:1;transform:translateY(0) scale(1)}}.mobile-user-menu-info{padding:var(--space-4);border-bottom:1px solid rgba(255,255,255,.08)}.mobile-user-menu-name{color:#fff;font-size:var(--font-size-sm);font-weight:var(--font-weight-semibold);margin-bottom:2px}.mobile-user-menu-role{color:#ffffff80;font-size:var(--font-size-xs)}.mobile-user-menu-logout{width:100%;padding:var(--space-3) var(--space-4);background:none;border:none;cursor:pointer;color:#ffffffa6;font-family:var(--font-family-base);font-size:var(--font-size-sm);text-align:left;display:flex;align-items:center;gap:var(--space-2);transition:background-color var(--transition-fast),color var(--transition-fast);-webkit-tap-highlight-color:transparent}.mobile-user-menu-logout:active{background-color:#ffffff0f;color:#fff}@media (max-width: 1024px){.main-content{padding:var(--space-5) var(--space-6)}}@media (max-width: 767px){.sidebar{display:none}.bottom-nav,.mobile-header{display:flex}.page-layout{flex-direction:column}.main-content{padding:calc(52px + var(--space-4)) var(--space-4) calc(60px + var(--space-4));height:100dvh;height:100vh}.btn{min-height:44px}.btn-sm{min-height:36px}.btn-lg{min-height:52px}.card,.card-hover{padding:var(--space-4)}h1{font-size:var(--font-size-2xl)}h2{font-size:var(--font-size-xl)}h3{font-size:var(--font-size-lg)}.input{font-size:16px;height:44px}textarea.input{font-size:16px;height:auto}select.input{font-size:16px}*{max-width:100%}img,video{height:auto}}@media (max-width: 375px){.main-content{padding-left:var(--space-3);padding-right:var(--space-3)}.bottom-nav-label{max-width:44px}}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}@media (max-width: 767px){.dashboard-stats-grid{grid-template-columns:repeat(2,1fr)!important;gap:var(--space-3)!important}.dashboard-modules-grid{grid-template-columns:1fr!important}.dashboard-review-banner{flex-direction:column!important;align-items:flex-start!important}.dashboard-review-banner button{width:100%}}@media (max-width: 767px){.vocab-cards-grid{grid-template-columns:1fr!important}.vocab-stats-row{flex-wrap:nowrap!important;overflow-x:auto!important;-webkit-overflow-scrolling:touch;gap:var(--space-2)!important;padding-bottom:var(--space-2)}.vocab-stats-row>*{flex:0 0 auto!important;min-width:80px!important}.vocab-action-bar{flex-direction:column!important;align-items:stretch!important}.vocab-action-bar>div{flex-direction:column!important;align-items:stretch!important}.vocab-action-bar button,.vocab-action-bar select{width:100%}.vocab-tabs-filters,.vocab-filter-row{flex-direction:column!important;align-items:stretch!important}.vocab-filter-row select,.vocab-filter-row a{width:100%}.vocab-drill-modes{flex-wrap:wrap!important}.vocab-drill-modes .btn{flex:1 1 calc(50% - var(--space-2))!important;min-width:140px;justify-content:center}}@media (max-width: 767px){.flashcard-rating-buttons{display:grid!important;grid-template-columns:1fr 1fr!important;gap:var(--space-2)!important}.flashcard-rating-buttons button{height:48px!important;font-size:var(--font-size-sm)!important}.flashcard-front{min-height:260px!important}}@media (max-width: 375px){.flashcard-word-size{font-size:28px!important}}@media (max-width: 767px){.drill-card{padding:var(--space-5) var(--space-4)!important}.drill-article-choices{flex-direction:column!important;align-items:stretch!important}.drill-article-choices button{width:100%!important;height:52px!important}.drill-stats-row{flex-direction:column!important;gap:var(--space-3)!important}}@media (max-width: 767px){.lessons-outer{padding:0!important}.lessons-grid{grid-template-columns:1fr!important}.lessons-header{flex-direction:column!important;align-items:flex-start!important;gap:var(--space-3)!important}.lessons-header button{width:100%}.lessons-create-form form{flex-direction:column!important}.lessons-create-form form input,.lessons-create-form form button{width:100%}}@media (max-width: 767px){.achievements-grid{grid-template-columns:repeat(2,1fr)!important;gap:var(--space-2)!important}}@media (max-width: 375px){.achievements-grid{grid-template-columns:1fr!important}}@media (max-width: 767px){.exercises-mode-selector{flex-direction:column!important}.exercises-session-card-inner{flex-direction:column!important;align-items:flex-start!important;gap:var(--space-2)!important}.exercises-session-card-inner>div:last-child{width:100%;display:flex;justify-content:space-between;align-items:center}.umlaut-button{min-height:36px!important;min-width:36px!important;padding:var(--space-1) var(--space-2)!important}}.admin-user-card{display:none}@media (max-width: 767px){.admin-outer{padding:var(--space-4)!important}.admin-header{flex-direction:column!important;align-items:flex-start!important;gap:var(--space-3)!important}.admin-header button{width:100%}.admin-table-wrapper table{display:none}.admin-table-wrapper{display:flex;flex-direction:column;gap:var(--space-3);padding:var(--space-4)}.admin-user-card{display:flex;flex-direction:column;gap:var(--space-2);padding:var(--space-4);background:var(--color-bg-card);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm)}}@media (max-width: 767px){.article-progress-summary{flex-direction:column!important}.article-progress-summary>div{flex:none!important;width:100%}.article-progress-grid{grid-template-columns:1fr!important;gap:var(--space-4)!important}}@media (max-width: 767px){.page-header-with-back{flex-wrap:wrap!important;gap:var(--space-2)!important}.session-dots-bar{gap:3px!important}.session-dots-bar>div{width:7px!important;height:7px!important}}@media (max-width: 767px){.word-popup-container{left:0!important;right:0!important;top:auto!important;bottom:0!important;position:fixed!important}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth;height:100%}body{font-family:var(--font-family-base);font-size:var(--font-size-base);font-weight:var(--font-weight-regular);line-height:var(--line-height-base);color:var(--color-text);background-color:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;min-height:100%}#root{min-height:100vh;display:flex;flex-direction:column}h1,h2,h3,h4,h5,h6{font-family:var(--font-family-base);font-weight:var(--font-weight-bold);line-height:1.25;color:var(--color-text)}h1{font-size:var(--font-size-3xl)}h2{font-size:var(--font-size-2xl)}h3{font-size:var(--font-size-xl)}h4{font-size:var(--font-size-lg)}h5{font-size:var(--font-size-md)}h6{font-size:var(--font-size-base)}p{line-height:var(--line-height-base);color:var(--color-text)}a{color:var(--color-primary);text-decoration:none}a:hover{color:var(--color-primary-light);text-decoration:underline}ul,ol{list-style:none}img,video,svg{display:block;max-width:100%}button,input,select,textarea{font-family:inherit;font-size:inherit}button{background:none;border:none;cursor:pointer}input,textarea,select{background:none;border:none;outline:none}table{border-collapse:collapse;border-spacing:0}hr{border:none;border-top:1px solid var(--color-border)}