:root{--navy: #0f2b44;--navy-light: #183d5e;--navy-dark: #091e30;--gold: #e8b931;--gold-light: #f5d76e;--gold-dim: #c49a1a;--cream: #faf6ec;--cream-dark: #ede5d0;--white: #ffffff;--text: #1a1a2e;--text-light: #5a6170;--text-muted: #8e95a3;--success: #27ae60;--danger: #e74c3c;--border: #dde1e8;--font-display: "Fraunces", serif;--font-body: "DM Sans", sans-serif;--container: 1200px;--radius: 10px;--radius-lg: 16px;--shadow-sm: 0 1px 3px rgba(15, 43, 68, .08);--shadow: 0 4px 16px rgba(15, 43, 68, .1);--shadow-lg: 0 8px 32px rgba(15, 43, 68, .14);--shadow-gold: 0 4px 20px rgba(232, 185, 49, .25)}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}body{font-family:var(--font-body);color:var(--text);background:var(--cream);line-height:1.6;min-height:100vh}a{color:inherit;text-decoration:none}button{font-family:var(--font-body);cursor:pointer;border:none;background:none}img{max-width:100%;display:block}.container{max-width:var(--container);margin:0 auto;padding:0 24px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 28px;border-radius:var(--radius);font-weight:600;font-size:.95rem;transition:all .25s ease;letter-spacing:.01em}.btn-primary{background:var(--gold);color:var(--navy-dark);box-shadow:var(--shadow-gold)}.btn-primary:hover{background:var(--gold-light);transform:translateY(-1px);box-shadow:0 6px 24px #e8b93159}.btn-secondary{background:var(--navy);color:var(--white)}.btn-secondary:hover{background:var(--navy-light);transform:translateY(-1px)}.btn-outline{border:2px solid var(--navy);color:var(--navy);background:transparent}.btn-outline:hover{background:var(--navy);color:var(--white)}.btn-sm{padding:8px 18px;font-size:.85rem}.btn-lg{padding:16px 36px;font-size:1.05rem}.navbar{background:var(--navy);position:sticky;top:0;z-index:100;box-shadow:0 2px 12px #00000026}.navbar-inner{display:flex;align-items:center;justify-content:space-between;height:68px}.navbar-logo{font-family:var(--font-display);font-size:1.5rem;font-weight:700;color:var(--white);display:flex;align-items:center;gap:10px}.navbar-logo .logo-accent{color:var(--gold)}.navbar-links{display:flex;align-items:center;gap:8px;list-style:none}.navbar-links a{color:#fffc;padding:8px 16px;border-radius:var(--radius);font-size:.9rem;font-weight:500;transition:all .2s ease}.navbar-links a:hover,.navbar-links a.active{color:var(--white);background:#ffffff1a}.navbar-auth{display:flex;align-items:center;gap:10px}.mobile-toggle{display:none;color:var(--white);font-size:1.5rem;padding:8px}@media (max-width: 768px){.mobile-toggle{display:block}.navbar-links,.navbar-auth{display:none;flex-direction:column;position:absolute;top:68px;left:0;right:0;background:var(--navy);padding:16px 24px;gap:4px;box-shadow:var(--shadow-lg)}.navbar-links.open,.navbar-auth.open{display:flex}.navbar-links a{width:100%;padding:12px 16px}}.hero{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-light) 50%,#1a5276 100%);padding:100px 0 80px;position:relative;overflow:hidden}.hero:before{content:"";position:absolute;top:-50%;right:-20%;width:600px;height:600px;background:radial-gradient(circle,rgba(232,185,49,.12) 0%,transparent 70%);border-radius:50%}.hero:after{content:"∑ ∫ π √ Δ";position:absolute;bottom:20px;right:40px;font-size:3rem;color:#ffffff0a;font-family:var(--font-display);letter-spacing:20px}.hero-content{position:relative;z-index:1;max-width:720px}.hero h1{font-family:var(--font-display);font-size:3.2rem;color:var(--white);line-height:1.15;margin-bottom:20px;font-weight:700}.hero h1 span{color:var(--gold)}.hero p{font-size:1.15rem;color:#ffffffbf;margin-bottom:36px;max-width:560px;line-height:1.7}.hero-actions{display:flex;gap:16px;flex-wrap:wrap}.section{padding:80px 0}.section-title{font-family:var(--font-display);font-size:2rem;font-weight:700;color:var(--navy);margin-bottom:12px}.section-subtitle{color:var(--text-light);font-size:1.05rem;margin-bottom:48px;max-width:560px}.section-header{text-align:center;display:flex;flex-direction:column;align-items:center}.card{background:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);padding:32px;transition:all .3s ease;border:1px solid var(--border)}.card:hover{box-shadow:var(--shadow);transform:translateY(-3px)}.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:24px}.card-icon{width:52px;height:52px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;margin-bottom:20px;background:linear-gradient(135deg,var(--navy) 0%,var(--navy-light) 100%);color:var(--gold)}.card h3{font-family:var(--font-display);font-size:1.2rem;font-weight:600;margin-bottom:10px;color:var(--navy)}.card p{color:var(--text-light);font-size:.92rem;line-height:1.6}.badge{display:inline-block;padding:4px 12px;border-radius:20px;font-size:.75rem;font-weight:600;text-transform:uppercase;letter-spacing:.05em}.badge-free{background:#e8f5e9;color:#2e7d32}.badge-premium{background:linear-gradient(135deg,#fff8e1,#ffecb3);color:var(--gold-dim)}.page-header{background:linear-gradient(135deg,var(--navy) 0%,var(--navy-light) 100%);padding:48px 0 40px}.page-header h1{font-family:var(--font-display);font-size:2.2rem;color:var(--white);font-weight:700}.page-header p{color:#ffffffb3;margin-top:8px}.breadcrumb{display:flex;align-items:center;gap:8px;margin-bottom:16px;font-size:.85rem;color:#ffffff80}.breadcrumb a{color:#fff9;transition:color .2s}.breadcrumb a:hover{color:var(--gold)}.content-list{padding:48px 0}.content-item{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;background:var(--white);border:1px solid var(--border);border-radius:var(--radius);margin-bottom:12px;transition:all .2s ease}.content-item:hover{box-shadow:var(--shadow-sm);border-color:var(--gold)}.content-item-info{display:flex;align-items:center;gap:16px}.content-item-icon{width:44px;height:44px;border-radius:10px;display:flex;align-items:center;justify-content:center;font-size:1.2rem;flex-shrink:0}.content-item-icon.pdf{background:#fce4ec;color:#c62828}.content-item-icon.interactive{background:#e3f2fd;color:#1565c0}.content-item-icon.manual{background:#f3e5f5;color:#7b1fa2}.content-item h4{font-size:.95rem;font-weight:600;margin-bottom:2px}.content-item span{font-size:.82rem;color:var(--text-muted)}.content-item-actions{display:flex;align-items:center;gap:12px}.empty-state{text-align:center;padding:80px 24px;color:var(--text-muted)}.empty-state-icon{font-size:3rem;margin-bottom:16px;opacity:.4}.empty-state h3{font-family:var(--font-display);color:var(--text-light);margin-bottom:8px}.filename-original{font-size:.67rem;color:#b0b8c4;margin-top:3px;font-style:italic}@media (max-width: 768px){.filename-original{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:200px}}.tabs{display:flex;flex-wrap:wrap;gap:4px;background:var(--white);padding:6px;border-radius:var(--radius);border:1px solid var(--border);margin-bottom:32px}.tab{padding:9px 14px;border-radius:7px;font-size:.82rem;font-weight:500;color:var(--text-light);transition:all .2s ease;white-space:nowrap;flex:1 1 auto;text-align:center;min-width:0}.tab:hover{color:var(--navy);background:var(--cream)}.tab.active{background:var(--navy);color:var(--white)}@media (max-width: 480px){.tab{font-size:.78rem;padding:8px 10px}}.search-btn-desktop{background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#ffffffd9;border-radius:8px;padding:6px 14px;font-size:.88rem;font-weight:500;cursor:pointer;display:flex;align-items:center;gap:5px;transition:background .2s;white-space:nowrap;font-family:var(--font-body)}.search-btn-desktop:hover{background:#ffffff2e;color:#fff}.mobile-actions{display:none;align-items:center;gap:6px}.mobile-search-btn{background:#ffffff1a;border:1px solid rgba(255,255,255,.2);color:#fff;border-radius:8px;width:38px;height:38px;font-size:1rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s}.mobile-search-btn:hover{background:#fff3}@media (max-width: 768px){.navbar-links,.navbar-auth{display:none!important}.mobile-toggle,.mobile-actions{display:flex!important}}@media (min-width: 769px){.mobile-toggle,.mobile-actions{display:none!important}}.auth-page{min-height:calc(100vh - 68px);display:flex;align-items:center;justify-content:center;padding:48px 24px;background:linear-gradient(160deg,var(--cream) 0%,var(--cream-dark) 100%)}.auth-card{background:var(--white);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:48px 40px;width:100%;max-width:440px;border:1px solid var(--border)}.auth-card h2{font-family:var(--font-display);font-size:1.6rem;color:var(--navy);margin-bottom:8px}.auth-card .auth-sub{color:var(--text-light);font-size:.92rem;margin-bottom:32px}.form-group{margin-bottom:20px}.form-group label{display:block;font-size:.85rem;font-weight:600;color:var(--text);margin-bottom:6px}.form-group input{width:100%;padding:12px 16px;border:1.5px solid var(--border);border-radius:var(--radius);font-family:var(--font-body);font-size:.92rem;transition:border-color .2s;background:var(--cream)}.form-group input:focus{outline:none;border-color:var(--gold);background:var(--white)}.form-error{color:var(--danger);font-size:.82rem;margin-top:4px}.auth-footer{text-align:center;margin-top:24px;font-size:.88rem;color:var(--text-light)}.auth-footer a{color:var(--navy);font-weight:600}.pricing-card{background:var(--white);border:2px solid var(--gold);border-radius:var(--radius-lg);padding:48px 40px;text-align:center;max-width:420px;margin:0 auto;box-shadow:var(--shadow-gold);position:relative;overflow:hidden}.pricing-card:before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--gold),var(--gold-light),var(--gold))}.pricing-price{font-family:var(--font-display);font-size:3rem;font-weight:800;color:var(--navy);margin:20px 0 4px}.pricing-period{color:var(--text-muted);font-size:.9rem;margin-bottom:28px}.pricing-features{list-style:none;text-align:left;margin-bottom:32px}.pricing-features li{padding:10px 0;font-size:.92rem;color:var(--text);border-bottom:1px solid var(--border);display:flex;align-items:center;gap:10px}.pricing-features li:last-child{border-bottom:none}.pricing-check{color:var(--success);font-weight:700}.profile-section{padding:48px 0}.profile-grid{display:grid;grid-template-columns:280px 1fr;gap:32px}@media (max-width: 768px){.profile-grid{grid-template-columns:1fr}}.profile-sidebar .card{text-align:center}.profile-avatar{width:80px;height:80px;border-radius:50%;background:linear-gradient(135deg,var(--navy),var(--navy-light));color:var(--gold);font-family:var(--font-display);font-size:2rem;font-weight:700;display:flex;align-items:center;justify-content:center;margin:0 auto 16px}.subscription-badge{display:inline-block;padding:6px 16px;border-radius:20px;font-size:.8rem;font-weight:600;margin-top:8px}.subscription-badge.free{background:var(--cream);color:var(--text-light)}.subscription-badge.premium{background:linear-gradient(135deg,var(--gold),var(--gold-light));color:var(--navy-dark)}.footer{background:var(--navy-dark);color:#fff9;padding:48px 0 24px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:40px;margin-bottom:40px}@media (max-width: 768px){.footer-grid{grid-template-columns:1fr 1fr;gap:24px}}.footer-brand{font-family:var(--font-display);font-size:1.3rem;color:var(--white);font-weight:700;margin-bottom:12px}.footer h4{color:var(--white);font-size:.85rem;text-transform:uppercase;letter-spacing:.08em;margin-bottom:16px}.footer ul{list-style:none}.footer ul li{margin-bottom:10px}.footer ul a{font-size:.88rem;transition:color .2s}.footer ul a:hover{color:var(--gold)}.footer-bottom{border-top:1px solid rgba(255,255,255,.1);padding-top:24px;text-align:center;font-size:.82rem}.lock-overlay{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:48px 24px;text-align:center;background:linear-gradient(180deg,transparent,rgba(250,246,236,.95) 30%);border-radius:var(--radius-lg)}.lock-icon{font-size:2.5rem;margin-bottom:16px;opacity:.6}.spinner{width:36px;height:36px;border:3px solid var(--border);border-top-color:var(--gold);border-radius:50%;animation:spin .7s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.fade-in-up{animation:fadeInUp .5s ease forwards}.delay-1{animation-delay:.1s}.delay-2{animation-delay:.2s}.delay-3{animation-delay:.3s}@media (max-width: 768px){.hero{padding:64px 0 48px}.hero h1{font-size:2.2rem}.section{padding:56px 0}.section-title{font-size:1.6rem}.auth-card{padding:32px 24px}.pricing-card{padding:36px 28px}.card-grid{grid-template-columns:1fr}}