@import "https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&display=swap";:root{--primary:#1a56db;--primary-dark:#1e40af;--primary-light:#dbeafe;--success:#059669;--success-light:#d1fae5;--warning:#d97706;--warning-light:#fef3c7;--danger:#dc2626;--danger-light:#fee2e2;--gray-50:#f9fafb;--gray-100:#f3f4f6;--gray-200:#e5e7eb;--gray-300:#d1d5db;--gray-400:#9ca3af;--gray-500:#6b7280;--gray-600:#4b5563;--gray-700:#374151;--gray-800:#1f2937;--gray-900:#111827;--radius:12px;--shadow:0 1px 3px 0 #0000001a, 0 1px 2px -1px #0000001a;--shadow-md:0 4px 6px -1px #0000001a, 0 2px 4px -2px #0000001a;--shadow-lg:0 10px 15px -3px #0000001a, 0 4px 6px -4px #0000001a}*{box-sizing:border-box;margin:0;padding:0}body{background:var(--gray-50);color:var(--gray-800);-webkit-font-smoothing:antialiased;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;line-height:1.6}#root,.app-container{flex-direction:column;min-height:100vh;display:flex}.nav{border-bottom:1px solid var(--gray-200);z-index:100;box-shadow:var(--shadow);background:#fff;padding:0 24px;position:sticky;top:0}.nav-inner{justify-content:space-between;align-items:center;max-width:1200px;height:64px;margin:0 auto;display:flex}.nav-logo{color:var(--gray-900);align-items:center;gap:10px;font-size:18px;font-weight:800;text-decoration:none;display:flex}.nav-logo-icon{background:linear-gradient(135deg,#1a56db,#7c3aed);border-radius:8px;justify-content:center;align-items:center;width:36px;height:36px;font-size:20px;display:flex}.nav-links{gap:4px;display:flex}.nav-link{color:var(--gray-500);border-radius:8px;padding:8px 16px;font-size:14px;font-weight:500;text-decoration:none;transition:all .2s}.nav-link:hover{background:var(--gray-100);color:var(--gray-800)}.nav-link.active{background:var(--primary-light);color:var(--primary)}.lang-toggle{border:2px solid var(--gray-200);cursor:pointer;background:#fff;border-radius:8px;margin-left:8px;padding:8px 14px;font-size:14px;font-weight:600;transition:all .2s}.lang-toggle:hover{border-color:var(--primary);background:var(--primary-light);color:var(--primary)}.main-content{flex:1;width:100%;max-width:1200px;margin:0 auto;padding:32px 24px}.hero{color:#fff;background:linear-gradient(135deg,#1a56db 0%,#7c3aed 100%);border-radius:16px;margin-bottom:32px;padding:48px;position:relative;overflow:hidden}.hero:before{content:"";background:#ffffff1a;border-radius:50%;width:400px;height:400px;position:absolute;top:-50%;right:-20%}.hero h1{margin-bottom:8px;font-size:36px;font-weight:800;position:relative}.hero p{opacity:.9;max-width:500px;font-size:16px;position:relative}.hero-stats{flex-wrap:wrap;gap:24px;margin-top:24px;display:flex;position:relative}.hero-stat{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#ffffff26;border-radius:12px;padding:16px 24px}.hero-stat-value{font-size:28px;font-weight:800}.hero-stat-label{opacity:.8;font-size:13px}.section-title{color:var(--gray-900);margin-bottom:16px;font-size:22px;font-weight:700}.cards-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:16px;margin-bottom:32px;display:grid}.card{border-radius:var(--radius);box-shadow:var(--shadow);border:1px solid var(--gray-200);color:inherit;cursor:pointer;background:#fff;padding:24px;text-decoration:none;transition:all .2s;display:block}.card:hover{box-shadow:var(--shadow-lg);border-color:var(--primary);transform:translateY(-2px)}.card-icon{border-radius:12px;justify-content:center;align-items:center;width:48px;height:48px;margin-bottom:12px;font-size:24px;display:flex}.card-title{color:var(--gray-900);margin-bottom:4px;font-size:16px;font-weight:600}.card-desc{color:var(--gray-500);font-size:13px}.card-progress{background:var(--gray-200);border-radius:2px;height:4px;margin-top:12px;overflow:hidden}.card-progress-fill{border-radius:2px;height:100%;transition:width .3s}.study-header{flex-wrap:wrap;align-items:center;gap:16px;margin-bottom:24px;display:flex}.back-btn{border:1px solid var(--gray-200);cursor:pointer;color:var(--gray-600);background:#fff;border-radius:8px;align-items:center;gap:6px;padding:8px 16px;font-size:14px;font-weight:500;text-decoration:none;transition:all .2s;display:inline-flex}.back-btn:hover{background:var(--gray-100);border-color:var(--gray-300)}.study-chapter-icon{border-radius:14px;justify-content:center;align-items:center;width:56px;height:56px;font-size:28px;display:flex}.study-chapter-title{color:var(--gray-900);font-size:28px;font-weight:800}.study-chapter-num{color:var(--gray-500);font-size:14px;font-weight:500}.study-sections{flex-direction:column;gap:16px;display:flex}.study-section{border-radius:var(--radius);border:1px solid var(--gray-200);box-shadow:var(--shadow);background:#fff;overflow:hidden}.study-section-header{cursor:pointer;-webkit-user-select:none;user-select:none;justify-content:space-between;align-items:center;padding:16px 24px;font-size:16px;font-weight:600;transition:background .2s;display:flex}.study-section-header:hover{background:var(--gray-50)}.study-section-content{color:var(--gray-700);padding:0 24px 20px;font-size:15px;line-height:1.8}.study-section-content 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.2s}.sign-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}.sign-card.flipped{border-color:var(--primary)}.sign-visual{text-align:center;color:#fff;justify-content:center;align-items:center;width:80px;height:80px;margin:0 auto 16px;font-size:14px;font-weight:800;line-height:1.2;display:flex}.sign-visual.octagon{clip-path:polygon(30% 0%,70% 0%,100% 30%,100% 70%,70% 100%,30% 100%,0% 70%,0% 30%)}.sign-visual.triangle{clip-path:polygon(50% 100%,0% 0%,100% 0%);padding-top:10px}.sign-visual.diamond{clip-path:polygon(50% 0%,100% 50%,50% 100%,0% 50%)}.sign-visual.circle{border-radius:50%}.sign-visual.rectangle,.sign-visual.rectangle-h{border-radius:4px}.sign-visual.pentagon{clip-path:polygon(50% 0%,100% 38%,82% 100%,18% 100%,0% 38%)}.sign-visual.pennant{clip-path:polygon(0% 0%,100% 50%,0% 100%);width:100px}.sign-name{text-align:center;color:var(--gray-900);margin-bottom:4px;font-size:15px;font-weight:600}.sign-category{text-align:center;color:var(--gray-400);text-transform:uppercase;letter-spacing:.5px;font-size:12px;font-weight:500}.sign-description{color:var(--gray-600);text-align:center;margin-top:12px;font-size:13px;line-height:1.5;display:none}.sign-card.flipped .sign-description{display:block}.videos-grid{grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:20px;display:grid}.video-card{border-radius:var(--radius);border:1px solid var(--gray-200);box-shadow:var(--shadow);background:#fff;transition:all .2s;overflow:hidden}.video-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}.video-card-thumb{background:#000;padding-bottom:56.25%;position:relative;overflow:hidden}.video-card-thumb img{object-fit:cover;width:100%;height:100%;position:absolute;top:0;left:0}.video-card-play{color:#fff;background:#000000b3;border-radius:50%;justify-content:center;align-items:center;width:60px;height:60px;font-size:24px;display:flex;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.video-card-info{padding:16px}.video-card-title{margin-bottom:4px;font-size:15px;font-weight:600}.video-card-chapter{color:var(--gray-400);font-size:13px}.chevron{color:var(--gray-400);font-size:14px;transition:transform .2s}.chevron.open{transform:rotate(90deg)}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:.3s ease-out fadeIn}@media (width<=768px){.nav-inner{flex-direction:column;gap:8px;height:auto;padding:12px 0}.nav-links{justify-content:center;width:100%;overflow-x:auto}.hero{padding:32px 24px}.hero h1{font-size:24px}.hero-stats{flex-direction:column;gap:12px}.cards-grid,.videos-grid{grid-template-columns:1fr}.quiz-setup{padding:24px}.quiz-question-card{padding:20px}.quiz-question-text{font-size:17px}}