:root{--bg-primary:#FFFCFA;--bg-secondary:#F8F4FF;--bg-soft:#FFF7F1;--gradient-main:linear-gradient(135deg, #7657FF 0%, #C655FF 44%, #FF8D4D 100%);--gradient-accent:linear-gradient(135deg, #7C4DFF 0%, #FF62C7 52%, #FFB14D 100%);--gradient-cta:linear-gradient(135deg, #6B45FF 0%, #A44DFF 48%, #FF9A4D 100%);--text-primary:#121126;--text-secondary:#5F6173;--text-white:#FFFFFF;--border-light:#ECE7F5;--card-shadow:0 24px 70px rgba(84, 54, 155, 0.12);--soft-shadow:0 12px 34px rgba(39, 31, 87, 0.08);--glow-purple:0 18px 42px rgba(118, 87, 255, 0.22);--glow-warm:0 18px 42px rgba(255, 141, 77, 0.2);--color-instagram:#E1306C;--gradient-instagram:linear-gradient(45deg, #F9CE34 0%, #EE2A7B 50%, #6228D7 100%);--color-facebook:#1877F2;--color-twitter:#0F1419;--color-kuaishou:#FF6E00;--gradient-kuaishou:linear-gradient(135deg, #FF6E00 0%, #FFB600 100%);--font-heading:'Poppins',sans-serif;--font-body:'DM Sans',sans-serif;--radius-card:26px;--radius-btn:50px;--radius-input:22px;--transition-smooth:all 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0;transition:var(--transition-smooth)}input{font-family:var(--font-body);outline:0;border:none}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 24px}.navbar{position:sticky;top:0;z-index:1000;height:70px;background:rgba(255,252,250,.84);backdrop-filter:blur(24px) saturate(1.25);-webkit-backdrop-filter:blur(24px) saturate(1.25);border-bottom:1px solid rgba(118,87,255,.1);display:flex;align-items:center;transition:var(--transition-smooth);box-shadow:0 12px 42px rgba(84,54,155,.08)}.navbar.scrolled{background:rgba(255,252,250,.94);box-shadow:0 16px 46px rgba(84,54,155,.12);height:60px}.nav-container{display:flex;justify-content:space-between;align-items:center;width:100%}.brand{display:flex;flex-direction:column;padding:8px 12px;border-radius:18px;transition:var(--transition-smooth)}.brand:hover{background:rgba(118,87,255,.07)}.logo-link{display:flex;align-items:center;gap:8px}.logo-text{font-family:var(--font-heading);font-weight:800;font-size:1.52rem;background:var(--gradient-main);-webkit-background-clip:text;-webkit-text-fill-color:transparent;display:flex;align-items:center;gap:4px}.logo-icon{width:24px;height:24px;fill:url(#main-grad)}.brand-subtitle{font-size:.65rem;color:#7a728e;text-transform:uppercase;letter-spacing:1px;font-weight:600;margin-top:-2px}.nav-links{display:flex;align-items:center;gap:8px;padding:6px;border-radius:999px;background:rgba(255,255,255,.72);border:1px solid rgba(236,231,245,.95);box-shadow:inset 0 1px 0 rgba(255,255,255,.95),0 12px 32px rgba(84,54,155,.07)}.nav-item{font-size:.95rem;font-weight:700;color:#4b5563;position:relative;padding:10px 15px;border-radius:999px;transition:var(--transition-smooth)}.nav-item::after{display:none}.nav-item:hover{color:#111827;background:linear-gradient(135deg,rgba(118,87,255,.12),rgba(255,141,77,.1));transform:translateY(-1px)}.hero{position:relative;padding:58px 0 52px;background:linear-gradient(115deg,rgba(255,252,250,.96) 0,rgba(249,244,255,.94) 52%,rgba(255,248,240,.96) 100%);overflow:hidden;text-align:center}.hero::before{content:'';position:absolute;top:3%;left:52%;width:520px;height:520px;background:radial-gradient(circle at 45% 40%,rgba(255,141,77,.58) 0 12%,rgba(198,85,255,.52) 30%,rgba(118,87,255,.2) 45%,rgba(118,87,255,0) 70%);filter:blur(2px);z-index:0;pointer-events:none;border-radius:50%}.hero::after{content:'';position:absolute;bottom:2%;right:-4%;width:760px;height:300px;background:linear-gradient(135deg,rgba(118,87,255,0) 0,rgba(118,87,255,.18) 28%,rgba(198,85,255,.2) 54%,rgba(255,141,77,.18) 100%);transform:rotate(-8deg) skewX(-18deg);filter:blur(16px);z-index:0;pointer-events:none;border-radius:50%}.hero-content{position:relative;z-index:1;max-width:1180px;margin:0 auto}.hero h1{font-size:clamp(2.6rem, 6vw, 4.9rem);line-height:1.04;margin-bottom:18px;letter-spacing:0;max-width:820px;margin-left:auto;margin-right:auto}.hero h1 span{background:var(--gradient-main);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.hero-subtext{font-size:1.08rem;color:var(--text-secondary);max-width:650px;margin:0 auto 34px}.paste-box-container{background:rgba(255,255,255,.92);border-radius:999px;padding:8px;border:1px solid rgba(236,231,245,.95);box-shadow:0 18px 54px rgba(84,54,155,.13);display:flex;align-items:center;position:relative;transition:var(--transition-smooth);max-width:760px;margin:0 auto 24px}.paste-box-container:focus-within{border-color:rgba(118,87,255,.5);box-shadow:0 20px 60px rgba(118,87,255,.18),0 0 0 5px 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12px;border-radius:var(--radius-btn);font-size:.75rem;font-weight:700;text-transform:uppercase;color:var(--text-white)}.platform-badge.instagram{background:var(--gradient-instagram)}.platform-badge.facebook{background:var(--color-facebook)}.platform-badge.twitter{background:var(--color-twitter)}.platform-badge.kuaishou{background:var(--gradient-kuaishou)}.platform-badge.generic{background:var(--text-secondary)}.video-title{font-size:1.2rem;line-height:1.4;font-weight:700;color:var(--text-primary);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.video-author{font-size:.9rem;color:var(--text-secondary);font-weight:500}.format-selection-container{background:var(--bg-primary);border:1px solid var(--border-light);border-radius:var(--radius-card);padding:24px;box-shadow:0 4px 20px rgba(0,0,0,.02)}.format-selection-container h3{font-size:1.15rem;margin-bottom:16px;font-weight:700}.preview-player-shell{width:100%;max-height:min(76vh,760px);margin:0 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rgba(118,87,255,.12)}.format-btn.active .format-name{color:#7657ff}.format-btn.disabled{opacity:.4;cursor:not-allowed;pointer-events:none}.format-btn svg{width:16px;height:16px;fill:currentColor;margin-bottom:2px}.download-action-card{display:flex;flex-direction:column;gap:12px}.btn-final-download{background:var(--gradient-cta);color:var(--text-white);font-weight:700;font-size:1.1rem;width:100%;height:56px;border-radius:var(--radius-btn);display:flex;align-items:center;justify-content:center;gap:10px;box-shadow:0 4px 20px rgba(0,114,255,.3)}.btn-final-download:hover{transform:translateY(-2px);box-shadow:0 6px 25px rgba(0,114,255,.4)}.btn-final-download svg{width:20px;height:20px;fill:currentColor}.result-tip{font-size:.8rem;color:var(--text-secondary);font-style:italic;text-align:center}.results-ads-wrapper{display:flex;gap:32px;max-width:1300px;margin:0 auto;align-items:flex-start}.results-ads-side{flex:0 0 300px}.results-content-center{flex:1}.how-it-works{padding:58px 0;text-align:center;background:linear-gradient(180deg,rgba(255,252,250,.75),rgba(248,244,255,.88))}.section-title{font-size:clamp(2rem, 4vw, 3rem);margin-bottom:8px;letter-spacing:0;line-height:1.12}.section-subtitle{font-size:1rem;color:var(--text-secondary);max-width:500px;margin:0 auto 28px}.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}.step-card{background:rgba(255,255,255,.82);border-radius:var(--radius-card);padding:34px 30px;box-shadow:var(--soft-shadow);border:1px solid rgba(236,231,245,.95);text-align:center;transition:var(--transition-smooth);position:relative;overflow:hidden}.step-card::before{content:'';position:absolute;inset:0 0 auto;height:4px;background:var(--gradient-cta)}.step-card:nth-child(2)::before{background:linear-gradient(135deg,#c655ff,#ff8d4d)}.step-card:nth-child(3)::before{background:linear-gradient(135deg,#ff62c7,#ffb14d)}.step-card:hover{transform:translateY(-6px);box-shadow:var(--card-shadow)}.step-icon-circle{width:64px;height:64px;border-radius:50%;background:linear-gradient(135deg,rgba(118,87,255,.14),rgba(255,141,77,.14));color:#7657ff;display:flex;align-items:center;justify-content:center;margin:0 auto 24px;font-size:1.5rem;transition:var(--transition-smooth)}.step-card:nth-child(2) .step-icon-circle{color:#c655ff}.step-card:nth-child(3) .step-icon-circle{color:#ff62c7}.step-card:hover .step-icon-circle{transform:scale(1.1)}.step-card h3{font-size:1.25rem;margin-bottom:12px}.step-card p{color:var(--text-secondary);font-size:.95rem}.download-guides{padding:58px 0;background:linear-gradient(135deg,rgba(248,244,255,.95),rgba(255,247,241,.95));border-top:1px solid rgba(236,231,245,.8);border-bottom:1px solid rgba(236,231,245,.8)}.download-guides .section-subtitle{margin-bottom:24px}.tabs-container{max-width:980px;margin:0 auto;background:rgba(255,255,255,.86);border:1px solid rgba(236,231,245,.95);border-radius:26px;box-shadow:var(--card-shadow);overflow:hidden}.tabs-nav{display:flex;gap:8px;padding:10px;background:rgba(255,255,255,.72);border-bottom:1px solid rgba(236,231,245,.9)}.tab-nav-btn{flex:1;height:42px;display:flex;align-items:center;justify-content:center;gap:7px;font-weight:700;font-size:.9rem;color:#374151;background:0 0;transition:var(--transition-smooth);border-radius:999px;border:1px solid transparent}.tab-nav-btn svg{width:18px;height:18px;fill:currentColor}.tab-nav-btn:hover{color:var(--text-primary)}.tab-nav-btn.active[data-tab=instagram]{background:rgba(255,255,255,.98);color:#c2185b;border-color:rgba(238,42,123,.24)}.tab-nav-btn.active[data-tab=facebook]{background:var(--bg-primary);color:var(--color-facebook);border-color:rgba(24,119,242,.24)}.tab-nav-btn.active[data-tab=twitter]{background:var(--bg-primary);color:var(--color-twitter);border-color:rgba(15,20,25,.18)}.tabs-content{padding:24px}.tab-panel{display:none}.tab-panel.active{display:flex;flex-direction:column;gap:16px}.tab-header{display:flex;align-items:center;gap:10px;margin-bottom:0}.tab-header svg{width:24px;height:24px}.tab-header h3{font-size:1.18rem;line-height:1.25}.tab-body{display:contents}.tab-body p{grid-column:1;color:var(--text-secondary);font-size:.95rem;margin-bottom:0;line-height:1.55}.tab-specs-grid{grid-column:2;grid-row:1/span 2;display:grid;grid-template-columns:1fr;gap:10px;background:var(--bg-secondary);padding:14px;border-radius:12px;border:1px solid var(--border-light)}.tab-spec-item{display:flex;flex-direction:column;gap:4px}.spec-label{font-size:.72rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px;font-weight:600}.spec-value{font-size:.92rem;font-weight:700;color:var(--text-primary)}.features-section{padding:58px 0;background:rgba(255,252,250,.75)}.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:1140px;margin:0 auto}.feature-card{display:flex;gap:20px;background:rgba(255,255,255,.86);border-radius:var(--radius-card);padding:24px;border:1px solid rgba(236,231,245,.95);box-shadow:var(--soft-shadow);transition:var(--transition-smooth)}.feature-card:hover{transform:translateY(-4px);box-shadow:var(--card-shadow)}.feature-icon-wrapper{flex:0 0 52px;height:52px;border-radius:18px;background:linear-gradient(135deg,rgba(118,87,255,.14),rgba(255,141,77,.14));color:#7657ff;display:flex;align-items:center;justify-content:center;font-size:1.3rem}.feature-info h3{font-size:1.15rem;margin-bottom:8px;font-weight:700}.feature-info p{color:var(--text-secondary);font-size:.95rem}.faq-section{padding:58px 0;background:linear-gradient(180deg,rgba(248,244,255,.95),rgba(255,248,240,.9));border-top:1px solid rgba(236,231,245,.8);border-bottom:1px solid rgba(236,231,245,.8)}.faq-section .section-subtitle{margin-bottom:24px}.faq-accordion-container{max-width:980px;margin:0 auto;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.faq-item{background:rgba(255,255,255,.88);border:1px solid rgba(236,231,245,.95);border-radius:18px;overflow:hidden;box-shadow:0 8px 22px rgba(26,26,46,.035);transition:var(--transition-smooth)}.faq-question-btn{width:100%;min-height:54px;padding:13px 16px;display:flex;justify-content:space-between;align-items:center;text-align:left;gap:16px;background:0 0}.faq-question-btn h3{font-size:.95rem;font-weight:700;color:var(--text-primary);transition:var(--transition-smooth)}.faq-item:hover .faq-question-btn h3{color:#7657ff}.faq-icon-arrow{flex:0 0 18px;width:18px;height:18px;fill:var(--text-secondary);transition:var(--transition-smooth)}.faq-answer-wrapper{max-height:0;overflow:hidden;transition:max-height .3s cubic-bezier(.4, 0, .2, 1)}.faq-answer-content{padding:0 16px 15px 16px;color:var(--text-secondary);font-size:.88rem;line-height:1.48}.faq-item.active{box-shadow:0 14px 34px rgba(118,87,255,.1);border-color:rgba(118,87,255,.35)}.faq-item.active .faq-icon-arrow{transform:rotate(180deg);fill:#7657FF}.faq-item.active .faq-question-btn h3{color:#7657ff}.toast-container{position:fixed;top:24px;left:50%;transform:translateX(-50%);z-index:9999;display:flex;flex-direction:column;gap:12px;width:100%;max-width:400px;padding:0 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