:root{--primary-h: 238;--primary-s: 83%;--primary-l: 65%;--primary: hsl(var(--primary-h), var(--primary-s), var(--primary-l));--primary-hover: hsl(var(--primary-h), var(--primary-s), 55%);--primary-light: hsl(var(--primary-h), var(--primary-s), 95%);--bg-main: #fcfdfe;--bg-card: #ffffff;--text-main: #1a1c2e;--text-muted: #64748b;--border: #eef1f6;--error: #ff4d4f;--success: #2ed573;--radius: 16px;--radius-sm: 8px;--shadow-sm: 0 2px 4px rgba(0, 0, 0, .02);--shadow: 0 8px 30px rgba(0, 0, 0, .04);--shadow-lg: 0 20px 40px rgba(0, 0, 0, .08);--transition: all .3s cubic-bezier(.4, 0, .2, 1);--admin-sidebar: #1a1c2e;--admin-sidebar-text: #f8fafc;--admin-input-bg: #ffffff;--admin-sidebar-hover: #232536;--admin-sidebar-active: var(--primary);--admin-input-border: #d1d5db;--admin-card-bg: #ffffff;--admin-card-border: #e5e7eb;--admin-subcard-bg: #f9fafb}@media(prefers-color-scheme:dark){:root{--bg-main: #0a0b14;--bg-card: #141521;--text-main: #f8fafc;--text-muted: #94a3b8;--border: #232536;--admin-input-bg: #141521;--admin-input-border: #334155;--admin-card-bg: #141521;--admin-card-border: #232536;--admin-subcard-bg: #0a0b14;--primary-light: hsla(var(--primary-h), var(--primary-s), var(--primary-l), .1)}}*{box-sizing:border-box}body{margin:0;font-family:Quicksand,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Open Sans,Helvetica Neue,sans-serif;background-color:var(--bg-main);color:var(--text-main);transition:background-color .3s,color .3s;-webkit-font-smoothing:antialiased}h1,h2,h3,h4,.auth-title{font-family:Outfit,sans-serif;font-weight:700;letter-spacing:-.02em}#root{min-height:100vh;display:flex;flex-direction:column}.auth-container{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:0;background-color:var(--bg-main)}.auth-wrapper{display:flex;width:100%;max-width:1000px;min-height:600px;background:var(--bg-card);border-radius:var(--radius);box-shadow:var(--shadow-lg);overflow:hidden;margin:20px;border:1px solid var(--border);transition:var(--transition)}.auth-image-side{flex:1;background-color:#f2f4f1;display:flex;align-items:center;justify-content:center;position:relative;overflow:hidden}.card-interactive{transition:var(--transition);cursor:pointer}.card-interactive:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}@media(max-width:768px){.auth-image-side{display:none}.auth-wrapper{max-width:450px}}.auth-image-container{width:100%;height:100%;position:relative}.auth-illustration{width:100%;height:100%;object-fit:contain;position:absolute}.auth-illustration.login{left:50%;top:50%;transform:translate(-50%,-50%)}.auth-form-side{flex:1;padding:64px 48px;display:flex;flex-direction:column;justify-content:center}.auth-card{width:100%;max-width:400px;margin:0 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ease}.language-option:hover{background:var(--bg-main);color:var(--primary)}.language-option.selected{background:#6366f11a;color:var(--primary);font-weight:600}.check-icon{color:var(--primary)}@media(prefers-color-scheme:dark){.language-toggle{background:#1e293b66;border-color:#ffffff1a}.language-toggle:hover{background:#1e293b99}.language-dropdown{background:#1e293bcc;border-color:#ffffff1a}}.category-card{display:flex;flex-direction:column;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;text-decoration:none;color:inherit;height:100%;min-height:250px}.category-card-image-wrap{aspect-ratio:4 / 3;width:100%;overflow:hidden;background:var(--bg-main);display:flex;align-items:center;justify-content:center;border-bottom:1px solid var(--border)}.category-card-image{width:100%;height:100%;object-fit:contain;padding:8px;transition:transform .5s ease}.category-card:hover 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rgba(255,255,255,.1)}.admin-sidebar-logo{font-weight:700;font-size:18px;color:#fff}.admin-nav{flex:1;padding:24px 12px;display:flex;flex-direction:column;gap:4px}.admin-nav-item{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:var(--radius-sm);color:var(--admin-sidebar-text);text-decoration:none;font-weight:600;transition:var(--transition)}.admin-nav-item:hover{background-color:var(--admin-sidebar-hover)}.admin-nav-item.active{background-color:var(--admin-sidebar-active);color:#fff}.admin-sidebar-footer{padding:24px;border-top:1px solid rgba(255,255,255,.1)}.admin-main{flex:1;margin-left:260px;display:flex;flex-direction:column}.admin-header{height:64px;background-color:var(--bg-card);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:flex-end;padding:0 32px;position:sticky;top:0;z-index:900}.admin-content{padding:32px;flex:1}@media(max-width:768px){.admin-sidebar{transform:translate(-100%)}.admin-main{margin-left:0}}.flashcard-viewer{display:flex;flex-direction:column;align-items:center;width:100%;max-width:800px;margin:0 auto}.flashcard-card-container{position:relative;width:100%;aspect-ratio:4/3;max-height:70vh}.flashcard-card{width:100%;height:100%;background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border);overflow:hidden;position:relative;box-shadow:var(--shadow-lg)}.flashcard-image-wrap{width:100%;height:100%;display:flex;align-items:center;justify-content:center;position:relative;background:#f9fafb}.flashcard-image{max-width:100%;max-height:100%;object-fit:contain;transition:var(--transition)}.flashcard-glass-overlay{margin-top:16px;background:#ffffffb3;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);padding:12px 32px;border-radius:40px;border:1px solid rgba(255,255,255,.3);box-shadow:0 8px 32px #0000001a;text-align:center}@media(prefers-color-scheme:dark){.flashcard-glass-overlay{background:#1e293bb3;border:1px solid rgba(255,255,255,.1)}}.flashcard-label{margin:0;font-size:2.5rem;font-weight:800;letter-spacing:.05em;color:var(--text-main);text-shadow:0 2px 4px rgba(0,0,0,.05)}.flashcard-navigation-overlay{position:absolute;top:50%;left:0;right:0;transform:translateY(-50%);display:flex;justify-content:space-between;padding:0 20px;pointer-events:none;z-index:3}.nav-btn{width:64px;height:64px;border-radius:50%;background:var(--bg-card);border:1px solid var(--border);color:var(--primary);display:flex;align-items:center;justify-content:center;cursor:pointer;box-shadow:var(--shadow);transition:var(--transition);pointer-events:auto}.nav-btn:hover:not(:disabled){transform:scale(1.1);background:var(--primary);color:#fff;border-color:var(--primary)}.nav-btn:disabled{opacity:.3;cursor:not-allowed;filter:grayscale(1)}@media(max-width:640px){.flashcard-label{font-size:1.5rem}.nav-btn{width:48px;height:48px}}