:root{--brand-primary:#2563eb;--brand-secondary:#06b6d4;--brand-accent:#8b5cf6;--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--info:var(--brand-secondary);--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;--surface-white:#ffffff;--surface-light:var(--gray-50);--surface-dark:var(--gray-900);--text-primary:var(--gray-900);--text-secondary:var(--gray-600);--text-muted:var(--gray-700);--border-light:var(--gray-200);--border-medium:var(--gray-300);--shadow-sm:0 1px 2px 0 rgba(0,0,0,0.05);--shadow-md:0 4px 6px -1px rgba(0,0,0,0.1),0 2px 4px -1px rgba(0,0,0,0.06);--shadow-lg:0 10px 15px -3px rgba(0,0,0,0.1),0 4px 6px -2px rgba(0,0,0,0.05);--shadow-xl:0 20px 25px -5px rgba(0,0,0,0.1),0 10px 10px -5px rgba(0,0,0,0.04);--space-1:0.25rem;--space-2:0.5rem;--space-3:0.75rem;--space-4:1rem;--space-5:1.25rem;--space-6:1.5rem;--space-8:2rem;--space-10:2.5rem;--space-12:3rem;--space-16:4rem;--space-20:5rem;--radius-sm:0.375rem;--radius-md:0.5rem;--radius-lg:0.75rem;--radius-xl:1rem;--radius-2xl:1.5rem}body{font-family:-apple-system,BlinkMacSystemFont,'Inter','Segoe UI','Roboto','Oxygen','Ubuntu','Cantarell','Fira Sans','Droid Sans','Helvetica Neue',sans-serif;line-height:1.6;color:var(--text-primary);background-color:var(--surface-white);font-size:16px;font-weight:400;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}h1,h2,h3,h4,h5,h6{font-weight:600;line-height:1.25;margin-bottom:var(--space-4);color:var(--text-primary)}h1{font-size:clamp(2rem,5vw,3rem)}h2{font-size:clamp(1.5rem,4vw,2.25rem)}h3{font-size:clamp(1.25rem,3vw,1.875rem)}h4{font-size:clamp(1.125rem,2.5vw,1.5rem)}h5{font-size:clamp(1rem,2vw,1.25rem)}h6{font-size:clamp(0.875rem,1.5vw,1.125rem)}p{margin-bottom:var(--space-4);line-height:1.6;color:var(--text-secondary)}.text-large{font-size:clamp(1.125rem,2.5vw,1.25rem);line-height:1.6}.text-small{font-size:clamp(0.875rem,1.5vw,0.9375rem);line-height:1.5}.mb-6{margin-bottom:var(--space-6)!important}.mb-4{margin-bottom:var(--space-4)!important}.mb-3{margin-bottom:var(--space-3)!important}.mb-2{margin-bottom:var(--space-2)!important}.mt-4{margin-top:var(--space-4)!important}.mt-6{margin-top:var(--space-6)!important}.gap-3{gap:var(--space-3)!important}.gap-4{gap:var(--space-4)!important}.text-secondary{color:var(--text-secondary)!important}.text-muted{color:var(--gray-700)!important;font-weight:400}.text-primary{color:var(--brand-primary)!important}.bg-light{background-color:var(--surface-light)!important}*{box-sizing:border-box}a,button,.btn,.nav-link,.dropdown-item{min-height:44px;display:inline-flex;align-items:center;text-decoration:none}a:focus,button:focus,.btn:focus,.nav-link:focus{outline:2px solid var(--brand-primary);outline-offset:2px;box-shadow:0 0 0 3px rgba(37,99,235,0.1)}html{scroll-behavior:smooth}body{line-height:1.6;color:var(--text-primary);font-size:16px}.hero-section{background:linear-gradient(135deg,var(--brand-primary) 0%,var(--brand-accent) 100%);color:#ffffff!important;padding:var(--space-16) 0;margin:0;text-align:center;position:relative}.hero-section::before{content:'';position:absolute;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,0.1);pointer-events:none}.hero-section *{position:relative;z-index:1}.hero-section h1,.hero-section .display-4{color:#ffffff!important;font-weight:700;text-shadow:0 2px 4px rgba(0,0,0,0.3)}.hero-section p{color:#ffffff!important;font-weight:400;text-shadow:0 1px 2px rgba(0,0,0,0.2);opacity:1!important}.hero-section .btn{box-shadow:0 4px 15px rgba(0,0,0,0.2);font-weight:600}.card{border:1px solid var(--border-light);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:all 0.3s cubic-bezier(0.4,0,0.2,1);background:var(--surface-white);overflow:hidden}.card:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);border-color:var(--brand-primary)}.card-body{padding:var(--space-6)}.card-title{font-size:1.25rem;font-weight:600;color:var(--text-primary);margin-bottom:var(--space-3)}.card-text{color:var(--text-secondary)!important;line-height:1.6;font-weight:400}.feature-icon{width:80px;height:80px;background:var(--surface-light);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto;box-shadow:var(--shadow-sm)}.step-icon{width:60px;height:60px;background:var(--surface-light);border-radius:50%;display:flex;align-items:center;justify-content:center;margin:0 auto;box-shadow:var(--shadow-sm)}#filePreview{min-height:100px;max-height:300px;overflow-y:auto}.navbar-brand{font-weight:bold;font-size:1.5rem}.btn{border-radius:var(--radius-md);font-weight:500;font-size:0.9375rem;padding:var(--space-3) var(--space-6);transition:all 0.2s cubic-bezier(0.4,0,0.2,1);border:1px solid transparent;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;gap:var(--space-2);min-height:44px;cursor:pointer}.btn:hover{transform:translateY(-1px);text-decoration:none}.btn:focus{outline:2px solid var(--brand-primary);outline-offset:2px}.btn-primary{background:var(--brand-primary);color:white;border-color:var(--brand-primary);box-shadow:var(--shadow-sm)}.btn-primary:hover{background:#1d4ed8;border-color:#1d4ed8;color:white;box-shadow:var(--shadow-md)}.btn-secondary{background:var(--surface-white);color:var(--brand-primary);border-color:var(--brand-primary)}.btn-secondary:hover{background:var(--brand-primary);color:white}.btn-success{background:var(--success);color:white;border-color:var(--success);box-shadow:var(--shadow-sm)}.btn-success:hover{background:#059669;border-color:#059669;color:white;box-shadow:var(--shadow-md)}.btn-lg{padding:var(--space-4) var(--space-8);font-size:1rem;min-height:48px;border-radius:var(--radius-lg)}.btn-sm{padding:var(--space-2) var(--space-4);font-size:0.875rem;min-height:36px;border-radius:var(--radius-sm)}.card-header{background:linear-gradient(45deg,var(--brand-primary),#1d4ed8);color:white;border-bottom:none}.card-header h4,.card-header h5{color:white}.alert{border-radius:10px;border:none}.form-control,.form-select{border-radius:var(--radius-md);border:1px solid var(--border-medium);transition:all 0.2s cubic-bezier(0.4,0,0.2,1);font-size:1rem;padding:var(--space-3) var(--space-4);min-height:44px;background:var(--surface-white);color:var(--text-primary)}.form-control:focus,.form-select:focus{border-color:var(--brand-primary);box-shadow:0 0 0 3px rgba(37,99,235,0.1);outline:none}.form-control::placeholder{color:var(--text-muted)}.form-label{font-weight:500;color:var(--text-primary);margin-bottom:var(--space-2)}.list-group-item{border:none;border-bottom:1px solid #e9ecef;padding:1rem}.list-group-item:last-child{border-bottom:none}.supported-formats{background:var(--surface-light);padding:3rem 2rem;border-radius:15px}.supported-formats h3{color:var(--brand-primary)}footer{background:var(--surface-light)!important;border-top:1px solid var(--border-light)}@keyframes pulse{0%{opacity:1}50%{opacity:0.5}100%{opacity:1}}.loading{animation:pulse 1.5s ease-in-out infinite}.fluid-container{width:100%;max-width:1400px;margin:0 auto;padding:0 clamp(1rem,4vw,2rem)}.fluid-grid{display:grid;gap:clamp(1rem,3vw,2rem);grid-template-columns:repeat(auto-fit,minmax(min(320px,100%),1fr))}.fluid-grid-2{display:grid;gap:clamp(1rem,3vw,2rem);grid-template-columns:repeat(auto-fit,minmax(min(300px,100%),1fr))}.fluid-grid-3{display:grid;gap:clamp(1rem,2.5vw,1.5rem);grid-template-columns:repeat(auto-fit,minmax(min(280px,100%),1fr))}.fluid-grid-4{display:grid;gap:clamp(0.75rem,2vw,1.25rem);grid-template-columns:repeat(auto-fit,minmax(min(250px,100%),1fr))}.flex-fluid{display:flex;flex-wrap:wrap;gap:clamp(1rem,3vw,2rem)}.flex-fluid>*{flex:1 1 clamp(280px,30%,400px)}.fluid-text-xl{font-size:clamp(2rem,5vw,3.5rem);line-height:1.2}.fluid-text-lg{font-size:clamp(1.5rem,4vw,2.25rem);line-height:1.3}.fluid-text-md{font-size:clamp(1rem,2.5vw,1.25rem);line-height:1.5}.fluid-spacing-xs{margin:clamp(0.5rem,2vw,1rem)}.fluid-spacing-sm{margin:clamp(1rem,3vw,1.5rem)}.fluid-spacing-md{margin:clamp(1.5rem,4vw,2.5rem)}.fluid-spacing-lg{margin:clamp(2rem,5vw,4rem)}.fluid-spacing-xl{margin:clamp(3rem,6vw,6rem)}.fluid-padding-xs{padding:clamp(0.5rem,2vw,1rem)}.fluid-padding-sm{padding:clamp(1rem,3vw,1.5rem)}.fluid-padding-md{padding:clamp(1.5rem,4vw,2.5rem)}.fluid-padding-lg{padding:clamp(2rem,5vw,4rem)}.fluid-padding-xl{padding:clamp(3rem,6vw,6rem)}.card-fluid{container-type:inline-size;border:none;box-shadow:0 2px 10px rgba(0,0,0,0.1);transition:transform 0.3s ease,box-shadow 0.3s ease;border-radius:clamp(8px,1vw,12px)}@container (min-width:300px){.card-fluid .card-body{padding:clamp(1rem,3vw,1.5rem)}}@container (min-width:400px){.card-fluid .card-title{font-size:clamp(1.1rem,2.5vw,1.25rem)}}@media (max-width:768px){.navbar{padding:var(--space-2) 0}.navbar-brand{font-size:1.25rem}.nav-link{padding:var(--space-4) var(--space-3)!important;font-size:1rem;min-height:44px;display:flex;align-items:center}.dropdown-menu{width:100%;border:none;box-shadow:none;padding:0}.dropdown-item{padding:var(--space-4) var(--space-6)!important;min-height:48px;font-size:1rem;border-bottom:1px solid var(--border-light)}.hero-section{padding:var(--space-12) var(--space-4);text-align:center}.hero-section h1{font-size:clamp(1.75rem,8vw,2.5rem);line-height:1.2;margin-bottom:var(--space-4);color:#ffffff!important;font-weight:700;text-shadow:0 2px 4px rgba(0,0,0,0.3)}.hero-section p{font-size:clamp(1rem,4vw,1.125rem);margin-bottom:var(--space-6);color:#ffffff!important;text-shadow:0 1px 2px rgba(0,0,0,0.2);opacity:1!important}.btn{min-height:48px;padding:var(--space-4) var(--space-6);font-size:1rem;font-weight:600}.btn-lg{min-height:52px;padding:var(--space-5) var(--space-8);font-size:1.125rem}.card{margin-bottom:var(--space-4)}.card-body{padding:var(--space-5)}.card-title{font-size:1.125rem;margin-bottom:var(--space-3)}.fluid-grid,.fluid-grid-2,.fluid-grid-3,.fluid-grid-4{grid-template-columns:1fr;gap:var(--space-4)}.form-control,.form-select{min-height:48px;font-size:1rem;padding:var(--space-4)}.container{padding-left:var(--space-4);padding-right:var(--space-4)}[data-feather]{width:20px!important;height:20px!important}.text-center{text-align:center!important}section{margin-bottom:var(--space-12)!important}h2{font-size:clamp(1.5rem,6vw,2rem);margin-bottom:var(--space-4)}h3{font-size:clamp(1.25rem,5vw,1.75rem);margin-bottom:var(--space-3)}p{line-height:1.6;margin-bottom:var(--space-4)}}@media (min-width:769px) and (max-width:1024px){.fluid-grid-3{grid-template-columns:repeat(2,1fr)}.fluid-grid-4{grid-template-columns:repeat(2,1fr)}}@media (min-width:1025px){.fluid-grid-4{grid-template-columns:repeat(4,1fr)}}@media (prefers-color-scheme:dark){body{background-color:#1a1a1a;color:#e9ecef}.card{background-color:#2d2d2d;color:#e9ecef}.form-control,.form-select{background-color:#2d2d2d;border-color:#495057;color:#e9ecef}.bg-light{background-color:#2d2d2d!important;color:#e9ecef}.text-muted{color:#adb5bd!important}}.text-gradient{background:linear-gradient(45deg,#007bff,#0056b3);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.shadow-soft{box-shadow:0 2px 25px rgba(0,0,0,0.1)!important}.border-radius-lg{border-radius:15px!important}.fade-in{animation:fadeIn 0.5s ease-in}@keyframes fadeIn{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.slide-up{animation:slideUp 0.5s ease-out}@keyframes slideUp{from{transform:translateY(50px);opacity:0}to{transform:translateY(0);opacity:1}}