:root{--primary: #f97316;--primary-dark: #ea580c;--primary-light: #fb923c;--secondary: #f59e0b;--accent: #3b82f6;--success: #10b981;--danger: #ef4444;--warning: #f59e0b;--dark: #0f172a;--darker: #020617;--gray: #64748b;--gray-light: #94a3b8;--light: #f8fafc;--border: #334155;--bg-body: #0f172a;--bg-card: #1e293b;--bg-card-hover: #334155;--bg-section: #020617;--text-primary: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--shadow: 0 4px 24px rgba(0, 0, 0, 0.3);--shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.4)}*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:"Inter",system-ui,-apple-system,sans-serif;background:var(--bg-body);color:var(--text-primary);line-height:1.75;overflow-x:hidden;min-height:100vh}h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3}a{color:var(--primary);text-decoration:none;transition:color .2s}a:hover{color:var(--primary-light)}img{max-width:100%;height:auto}::selection{background:var(--primary);color:#fff}::-webkit-scrollbar{width:10px}::-webkit-scrollbar-track{background:var(--bg-body)}::-webkit-scrollbar-thumb{background:var(--border);border-radius:5px}::-webkit-scrollbar-thumb:hover{background:var(--gray)}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}.section{padding:60px 0}@media(max-width: 768px){.section{padding:40px 0}}.breadcrumb-nav{background:var(--bg-card);border-bottom:1px solid var(--border);padding:14px 0;font-size:.85rem;position:sticky;top:64px;z-index:99}.breadcrumb-nav a{color:var(--gray-light);text-decoration:none;transition:color .2s}.breadcrumb-nav a:hover{color:var(--primary)}.breadcrumb-nav .sep{margin:0 10px;color:var(--gray)}.breadcrumb-nav .cur{color:var(--text-primary);font-weight:600}.hero{padding:100px 0 80px;background:linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);color:var(--text-primary);position:relative;overflow:hidden;text-align:center}.hero::before{content:"";position:absolute;top:-50%;left:-20%;width:600px;height:600px;background:radial-gradient(circle, rgba(249, 115, 22, 0.08) 0%, transparent 70%);pointer-events:none}.hero::after{content:"";position:absolute;bottom:-2px;left:0;right:0;height:60px;background:var(--bg-body);clip-path:ellipse(55% 100% at 50% 100%)}.hero h1{font-size:clamp(2rem,5vw,3.5rem);font-weight:900;margin-bottom:16px;line-height:1.2}.hero p{font-size:1.1rem;color:var(--text-secondary);max-width:600px;margin:0 auto;line-height:1.7}.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(249,115,22,.15);color:var(--primary);padding:8px 20px;border-radius:50px;font-size:.85rem;font-weight:600;margin-bottom:20px;border:1px solid rgba(249,115,22,.2)}.tool-wrapper{margin-top:-30px;position:relative;z-index:10;padding-bottom:2rem}.tool-card{background:var(--bg-card);border-radius:20px;padding:2.5rem;box-shadow:var(--shadow);border:1px solid var(--border)}.upload-zone{border:2.5px dashed rgba(249,115,22,.3);border-radius:16px;padding:3.5rem 2rem;text-align:center;cursor:pointer;transition:all .3s;background:rgba(249,115,22,.03)}.upload-zone:hover,.upload-zone.dragover{border-color:var(--primary);background:rgba(249,115,22,.07);transform:scale(1.01)}.upload-zone .icon{font-size:3.5rem;color:var(--primary);margin-bottom:16px}.upload-zone h3{font-size:1.3rem;margin-bottom:8px}.upload-zone p{color:var(--text-secondary);margin-bottom:20px}.content-section{padding:40px 0}.content-card{background:var(--bg-card);border-radius:20px;padding:40px;margin-bottom:32px;box-shadow:var(--shadow);border:1px solid var(--border)}.content-card h2{font-size:1.5rem;margin-bottom:16px;color:var(--text-primary)}.content-card h3{font-size:1.2rem;margin-bottom:12px;color:var(--text-primary)}.content-card p{color:var(--text-secondary);margin-bottom:16px;line-height:1.8}.content-card ul{color:var(--text-secondary);margin-bottom:16px;padding-left:20px}.content-card ul li{margin-bottom:8px}.file-info-bar{background:var(--bg-body);border:1px solid var(--border);border-radius:12px;padding:12px 16px;display:flex;flex-wrap:wrap;align-items:center;gap:8px 16px;font-size:.88rem;color:var(--text-secondary)}.file-info-bar .info-chip{display:inline-flex;align-items:center;gap:6px;background:var(--bg-card);padding:4px 12px;border-radius:8px;border:1px solid var(--border);white-space:nowrap}.file-info-bar .info-chip i{color:var(--primary);font-size:.8rem}.preview-container{background:var(--bg-body);border-radius:12px;padding:1.5rem;display:flex;justify-content:center;align-items:center;min-height:300px;border:1px solid var(--border)}#image-canvas{max-width:100%;box-shadow:0 4px 20px rgba(0,0,0,.3);border-radius:2px}.settings-panel{margin-top:1.25rem}.setting-card{background:var(--bg-body);border:1px solid var(--border);border-radius:12px;padding:1rem;height:100%;transition:border-color .2s}.setting-card:focus-within{border-color:var(--primary)}.setting-card label{font-size:.82rem;font-weight:600;color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:8px;display:flex;align-items:center;gap:6px}.setting-card label i{color:var(--primary);font-size:.9rem}.setting-card select{border:1.5px solid var(--border);border-radius:8px;padding:10px 12px;font-size:.92rem;color:var(--text-primary);background:var(--bg-card);width:100%;cursor:pointer;-webkit-appearance:none;appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2394a3b8' d='M6 8L1 3h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;padding-right:28px;transition:border-color .2s}.setting-card select:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(249,115,22,.1)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 28px;font-weight:600;font-size:.95rem;border-radius:10px;border:none;cursor:pointer;transition:all .25s;text-decoration:none}.btn-primary{background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;box-shadow:0 4px 15px rgba(249,115,22,.3)}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(249,115,22,.4);color:#fff}.btn-success{background:linear-gradient(135deg, var(--success), #059669);color:#fff;box-shadow:0 4px 15px rgba(16,185,129,.3)}.btn-success:hover{transform:translateY(-2px);box-shadow:0 8px 25px rgba(16,185,129,.4);color:#fff}.btn-outline{background:rgba(0,0,0,0);border:2px solid var(--primary);color:var(--primary)}.btn-outline:hover{background:var(--primary);color:#fff;transform:translateY(-2px)}.btn-lg{padding:14px 36px;font-size:1.05rem}.btn-block{width:100%}#progress-bar{width:100%;background:var(--bg-body);border-radius:10px;overflow:hidden;height:8px;margin:1.25rem 0;display:none}#progress-fill{height:100%;background:linear-gradient(90deg, var(--primary), var(--success));width:0%;border-radius:10px;transition:width .3s ease}.d-none{display:none !important}.mt-3{margin-top:1rem !important}.mt-4{margin-top:1.5rem !important}.mb-3{margin-bottom:1rem !important}.mb-4{margin-bottom:1.5rem !important}.g-3{gap:1rem !important}.row{display:flex;flex-wrap:wrap}.col-md-3{width:25%;padding:0 8px}.col-md-4{width:33.333%;padding:0 8px}.col-md-6{width:50%;padding:0 8px}.col-md-12{width:100%;padding:0 8px}@media(max-width: 768px){.col-md-3,.col-md-4,.col-md-6{width:100%}}.trust-bar{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;padding:20px;margin:16px 0;background:var(--bg-body);border-radius:12px;border:1px solid var(--border)}.trust-item{display:flex;align-items:center;gap:8px;font-size:.85rem;color:var(--text-secondary)}.trust-item i{color:var(--primary)}.case-grid{display:grid;grid-template-columns:repeat(auto-fill, minmax(320px, 1fr));gap:24px;margin:24px 0}.case-card{background:var(--bg-body);border-radius:14px;padding:24px;border:1px solid var(--border);transition:all .25s;position:relative}.case-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}.case-card h3{font-size:1rem;font-weight:600;margin-bottom:12px;padding-right:24px;color:var(--text-primary)}.case-number{position:absolute;top:12px;right:16px;font-size:2rem;font-weight:900;color:rgba(249,115,22,.08);line-height:1}.case-detail{font-size:.88rem;color:var(--text-secondary);margin-bottom:8px;line-height:1.5}.case-detail strong{color:var(--primary)}.usage-guide{padding:0}.usage-guide .steps{display:flex;flex-wrap:wrap;gap:16px;margin:24px 0}.usage-guide .step-item{flex:1;min-width:180px;background:var(--bg-body);border-radius:12px;padding:24px;border:1px solid var(--border);position:relative;text-align:center}.usage-guide .step-num{width:36px;height:36px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:.95rem;margin:0 auto 12px}.usage-guide h3{font-size:.95rem;margin-bottom:6px}.usage-guide p{font-size:.85rem;color:var(--text-secondary);margin-bottom:0;line-height:1.5}.faq-list{max-width:800px;margin:0 auto}.faq-item{border:1px solid var(--border);border-radius:12px;margin-bottom:12px;overflow:hidden;transition:all .2s;background:var(--bg-body)}.faq-item:hover{border-color:var(--primary)}.faq-item.open .faq-toggle{transform:rotate(180deg)}.faq-item.open .faq-answer{max-height:500px;padding:16px 20px}.faq-question{width:100%;display:flex;justify-content:space-between;align-items:center;padding:18px 20px;background:var(--bg-card);border:none;cursor:pointer;font-size:.95rem;font-weight:600;color:var(--text-primary);text-align:left;transition:all .2s}.faq-question:hover{background:rgba(249,115,22,.05)}.faq-toggle{transition:transform .3s;color:var(--gray);flex-shrink:0}.faq-answer{max-height:0;overflow:hidden;transition:max-height .3s ease,padding .3s ease;padding:0 20px;background:var(--bg-body)}.faq-answer div{font-size:.9rem;color:var(--text-secondary);line-height:1.7}.related-tools{margin:60px 0;padding:40px;background:var(--bg-card);border-radius:20px;box-shadow:var(--shadow);border:1px solid var(--border)}.related-tools h2{font-size:1.5rem;margin-bottom:8px}.related-tools>p{color:var(--text-secondary);margin-bottom:24px}.related-grid{display:grid;grid-template-columns:repeat(5, 1fr);gap:12px}.related-card{display:flex;flex-direction:column;padding:14px 16px;background:var(--bg-body);border-radius:12px;border:1px solid var(--border);transition:all .25s;text-decoration:none}.related-card:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--primary)}.related-name{font-weight:600;color:var(--primary);margin-bottom:4px;font-size:.9rem}.related-desc{color:var(--text-muted);font-size:.82rem;line-height:1.4}.success-message{background:linear-gradient(135deg, rgba(16, 185, 129, 0.1), rgba(5, 150, 105, 0.1));border:1px solid rgba(16,185,129,.3);border-radius:14px;padding:28px;text-align:center}.success-message i{font-size:2.5rem;color:var(--success);margin-bottom:12px}.success-message h4{color:var(--success);margin-bottom:8px}.success-message p{color:var(--text-secondary);margin-bottom:16px}.alert-fixed{position:fixed;top:80px;right:20px;z-index:9999;max-width:360px;box-shadow:0 8px 24px rgba(0,0,0,.3);border-radius:12px;padding:16px 20px}@media(max-width: 768px){.tool-card{padding:1.5rem}.upload-zone{padding:2rem 1rem}.content-card{padding:24px}.case-grid{grid-template-columns:1fr}}@media(max-width: 991px){.related-grid{grid-template-columns:repeat(3, 1fr)}}@media(max-width: 575px){.related-grid{grid-template-columns:repeat(2, 1fr)}}.main-nav{background:var(--bg-card) !important;border-bottom:1px solid var(--border) !important}.back-to-top{position:fixed;bottom:30px;right:30px;width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg, var(--primary), var(--primary-dark));color:#fff;border:none;cursor:pointer;z-index:999;display:none;align-items:center;justify-content:center;font-size:1.2rem;box-shadow:0 4px 15px rgba(249,115,22,.3);transition:all .3s}.back-to-top.show{display:flex}.back-to-top:hover{transform:translateY(-3px)}.loading-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(15,23,42,.85);backdrop-filter:blur(8px);z-index:9998;display:none;align-items:center;justify-content:center;flex-direction:column;gap:16px}.loading-overlay.active{display:flex}.loading-spinner{width:48px;height:48px;border:4px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.loading-text{color:#fff;font-size:1rem;font-weight:500}.usage-guide{background:rgba(0,0,0,0) !important}select[id=color-mode]{box-shadow:inset 3px 0 0 0 var(--primary);transition:box-shadow .3s}select[id=color-mode].cm-gray{box-shadow:inset 3px 0 0 0 #94a3b8}select[id=color-mode].cm-bw{box-shadow:inset 3px 0 0 0 #e2e8f0}#app-content[data-theme=light]{--bg-body: #f8fafc;--bg-card: #ffffff;--bg-card-hover: #f1f5f9;--bg-section: #f1f5f9;--text-primary: #1e293b;--text-secondary: #475569;--text-muted: #94a3b8;--border: #e2e8f0;--shadow: 0 4px 24px rgba(0, 0, 0, 0.08);--shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.1)}#app-content[data-theme=light] .hero{background:linear-gradient(135deg, #f8fafc 0%, #f1f5f9 50%, #f8fafc 100%)}#app-content[data-theme=light] .custom-select option{background:#fff;color:#1e293b}#app-content[data-theme=light] .loading-overlay{background:rgba(248,250,252,.9)}#app-content[data-theme=light] .loading-text{color:var(--text-primary)}#app-content[data-theme=light] #floatThemeToggle{background:var(--bg-card);color:var(--text-primary)}#floatThemeToggle{position:fixed;top:100px;right:20px;width:48px;height:48px;background:var(--bg-card);border:1px solid var(--border);border-radius:50%;cursor:pointer;z-index:1000;display:flex;align-items:center;justify-content:center;color:var(--text-primary);font-size:1.2rem;box-shadow:var(--shadow);transition:all .3s}#floatThemeToggle:hover{background:var(--primary);color:#fff;border-color:var(--primary)}@media(max-width: 480px){.hero{padding:60px 0 50px}.hero h1{font-size:1.75rem}.hero-badge{padding:6px 16px;font-size:.78rem}.tool-card{padding:1.25rem}.upload-zone{padding:2rem 1rem}.content-card{padding:20px}.file-info-bar{flex-direction:column;align-items:flex-start}.case-grid{grid-template-columns:1fr}.related-tools{margin:40px 0;padding:24px 16px}.related-grid{grid-template-columns:repeat(2, 1fr)}.usage-guide .steps{flex-direction:column}.alert-fixed{right:10px;left:10px;max-width:none}.back-to-top{right:16px;bottom:16px;width:40px;height:40px}.col-md-3,.col-md-4,.col-md-6{width:100%}}@media(prefers-reduced-motion: reduce){*,*::before,*::after{animation-duration:.01ms !important;transition-duration:.01ms !important}}