.landing-wrapper{--bg:#faf9f7;--surface:#fff;--fg:#1a1916;--muted:#7a756e;--border:#e8e5df;--accent:#1d6af5;--accent-soft:color-mix(in oklch, var(--accent) 12%, transparent);--fg-soft:color-mix(in oklch, var(--fg) 5%, transparent);--warm:#d97706;--warm-soft:color-mix(in oklch, var(--warm) 10%, transparent);--dark:#0b1221;--dark-text:#e2eaff99;--dark-bright:#e2eaff;--dark-border:#ffffff12;--success:#059669;--font-display:"DM Serif Display", Georgia, serif;--font-body:"Plus Jakarta Sans", -apple-system, system-ui, sans-serif;--font-mono:ui-monospace, "SF Mono", Menlo, monospace;--fs-display:clamp(48px, 7vw, 80px);--fs-h1:clamp(36px, 5vw, 56px);--fs-h2:clamp(28px, 3.5vw, 40px);--fs-h3:20px;--fs-lead:18px;--fs-body:16px;--fs-small:14px;--fs-meta:12px;--gap-xs:8px;--gap-sm:12px;--gap-md:20px;--gap-lg:32px;--gap-xl:56px;--gap-2xl:96px;--container:1120px;--gutter:24px;--radius:10px;--radius-lg:14px}.dark .landing-wrapper{--bg:#0a0a0a;--surface:#121212;--fg:#ededed;--muted:#a1a1aa;--border:#27272a;--accent:#3b82f6;--accent-soft:color-mix(in oklch, var(--accent) 20%, transparent);--fg-soft:color-mix(in oklch, var(--fg) 8%, transparent);--warm:#f59e0b;--warm-soft:color-mix(in oklch, var(--warm) 15%, transparent);--dark:#050505;--dark-text:#ffffffb3;--dark-bright:#fff;--dark-border:#ffffff1a;--success:#10b981}*,:before,:after{box-sizing:border-box}.landing-wrapper html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}.landing-wrapper body{background:var(--bg);color:var(--fg);font-family:var(--font-body);font-size:var(--fs-body);text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;margin:0;line-height:1.55}.landing-wrapper img,.landing-wrapper svg{max-width:100%;display:block}.landing-wrapper a{color:inherit;text-decoration:none}.landing-wrapper button{font:inherit;cursor:pointer}.landing-wrapper p{text-wrap:pretty}.landing-wrapper h1,.landing-wrapper h2,.landing-wrapper h3,.landing-wrapper h4{text-wrap:balance}.landing-wrapper .container{max-width:var(--container);padding-inline:var(--gutter);margin-inline:auto}.landing-wrapper .section{padding-block:clamp(56px, 8vw, var(--gap-2xl))}.landing-wrapper .section+.section{border-top:1px solid var(--border)}.landing-wrapper .stack{flex-direction:column;display:flex}.landing-wrapper .stack>*+*{margin-top:var(--gap-md)}.landing-wrapper .row{align-items:center;gap:var(--gap-md);display:flex}.landing-wrapper .row-between{justify-content:space-between;align-items:center;gap:var(--gap-md);display:flex}.landing-wrapper .grid-2{gap:var(--gap-lg);grid-template-columns:repeat(2,1fr);display:grid}.landing-wrapper .grid-3{gap:var(--gap-lg);grid-template-columns:repeat(3,1fr);display:grid}.landing-wrapper .grid-4{gap:var(--gap-md);grid-template-columns:repeat(4,1fr);display:grid}@media (max-width:920px){.landing-wrapper .grid-2,.landing-wrapper .grid-3,.landing-wrapper .grid-4{grid-template-columns:1fr}}.landing-wrapper h1{font-family:var(--font-display);font-size:var(--fs-h1);letter-spacing:-.02em;margin:0;font-weight:400;line-height:1.05}.landing-wrapper h2{font-family:var(--font-display);font-size:var(--fs-h2);letter-spacing:-.015em;margin:0;font-weight:400;line-height:1.1}.landing-wrapper h3{font-size:var(--fs-h3);letter-spacing:-.005em;margin:0;font-weight:600;line-height:1.35}.landing-wrapper .lead{font-size:var(--fs-lead);color:var(--muted);max-width:60ch;margin:0;line-height:1.6}.landing-wrapper .eyebrow{font-family:var(--font-mono);font-size:var(--fs-meta);letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin:0 0 var(--gap-md)}.landing-wrapper .meta{font-family:var(--font-mono);font-size:var(--fs-meta);color:var(--muted)}.landing-wrapper .num{font-family:var(--font-mono);font-variant-numeric:tabular-nums}.landing-wrapper .display{font-family:var(--font-display);font-size:var(--fs-display);letter-spacing:-.03em;font-weight:400;line-height:1}.landing-wrapper em.i{font-style:italic}.landing-wrapper .reveal{opacity:0;transition:opacity .7s cubic-bezier(.16,1,.3,1),transform .7s cubic-bezier(.16,1,.3,1);transform:translateY(24px)}.landing-wrapper .reveal.visible{opacity:1;transform:translateY(0)}.landing-wrapper .reveal-delay-1{transition-delay:.1s}.landing-wrapper .reveal-delay-2{transition-delay:.2s}.landing-wrapper .reveal-delay-3{transition-delay:.3s}.landing-wrapper .topnav{z-index:10;background:color-mix(in oklch, var(--bg) 92%, transparent);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--border);transition:box-shadow .3s;position:sticky;top:0}.landing-wrapper .topnav.scrolled{box-shadow:0 1px 8px #0000000f}.landing-wrapper .topnav-inner{justify-content:space-between;align-items:center;padding-block:14px;display:flex}.landing-wrapper .topnav .logo{font-family:var(--font-display);letter-spacing:-.01em;align-items:center;gap:10px;font-size:19px;font-weight:400;display:flex}.landing-wrapper .topnav nav{gap:var(--gap-lg);display:flex}.landing-wrapper .topnav nav a{font-size:var(--fs-small);color:var(--muted);font-weight:500;transition:color .15s}.landing-wrapper .topnav nav a:hover{color:var(--fg)}@media (max-width:640px){.landing-wrapper .topnav nav{display:none}}.landing-wrapper .btn{border-radius:var(--radius);letter-spacing:-.005em;white-space:nowrap;border:1px solid #0000;align-items:center;gap:8px;padding:11px 22px;font-size:15px;font-weight:500;transition:transform 60ms,background .15s,border-color .15s,box-shadow .15s;display:inline-flex}.landing-wrapper .btn:active{transform:translateY(1px)}.landing-wrapper .btn-primary{background:var(--accent);color:#fff;border-color:var(--accent);box-shadow:0 1px 3px #1d6af540}.landing-wrapper .btn-primary:hover{background:color-mix(in oklch, var(--accent) 85%, black);box-shadow:0 4px 14px #1d6af54d}.landing-wrapper .btn-secondary{color:var(--fg);border-color:var(--border);background:0 0}.landing-wrapper .btn-secondary:hover{border-color:var(--fg)}.landing-wrapper .btn-ghost{color:var(--fg);background:0 0;border-color:#0000;padding-inline:8px}.landing-wrapper .btn-ghost:hover{color:var(--accent)}.landing-wrapper .btn-arrow:after{content:"→";transition:transform .15s;display:inline-block}.landing-wrapper .btn-arrow:hover:after{transform:translate(3px)}.landing-wrapper .card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:28px}.landing-wrapper .card-flat{background:0 0;border:0;padding:0}.landing-wrapper .feature{transition:transform .2s cubic-bezier(.16,1,.3,1)}.landing-wrapper .feature:hover{transform:translateY(-3px)}.landing-wrapper .feature .f-mark{border:1px solid var(--border);width:36px;height:36px;color:var(--accent);margin-bottom:var(--gap-md);border-radius:10px;place-items:center;transition:background .2s,border-color .2s,box-shadow .2s;display:grid}.landing-wrapper .feature:hover .f-mark{background:var(--accent-soft);border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}.landing-wrapper .feature .f-mark svg{width:18px;height:18px}.landing-wrapper .feature h3{margin-bottom:6px}.landing-wrapper .feature p{color:var(--muted);margin:0;font-size:15px;line-height:1.6}.landing-wrapper .stat .stat-num{font-family:var(--font-display);letter-spacing:-.03em;color:var(--fg);font-size:clamp(48px,7vw,80px);font-weight:400;line-height:.95}.landing-wrapper .stat .stat-label{color:var(--muted);font-size:var(--fs-small);max-width:28ch;margin-top:8px;line-height:1.5}.landing-wrapper .stat .stat-unit{opacity:.6;margin-left:2px;font-size:.5em}.landing-wrapper .stats-dark{background:var(--fg-soft);position:relative}.landing-wrapper .stats-dark .stat .stat-num{color:var(--fg)}.landing-wrapper .stats-dark .stat .stat-label{color:var(--muted)}.landing-wrapper .stats-dark .grid-4{position:relative}.landing-wrapper .stat-divider{background:var(--border);align-self:stretch;width:1px}@media (max-width:768px){.landing-wrapper .stat-divider{display:none}.landing-wrapper .stats-dark .grid-4{gap:var(--gap-lg);grid-template-columns:repeat(2,1fr)}}.landing-wrapper .quote{font-family:var(--font-display);letter-spacing:-.01em;max-width:32ch;font-size:clamp(22px,2.5vw,30px);font-weight:400;line-height:1.35}.landing-wrapper .quote-author{color:var(--muted);font-size:var(--fs-small);margin-top:var(--gap-md)}.landing-wrapper .quote-mark{font-family:var(--font-display);color:var(--accent);opacity:.12;-webkit-user-select:none;user-select:none;margin-bottom:-20px;font-size:120px;line-height:.7}.landing-wrapper .ds-table{border-collapse:collapse;width:100%;font-size:14px}.landing-wrapper .ds-table th,.landing-wrapper .ds-table td{text-align:left;border-bottom:1px solid var(--border);padding:12px 14px}.landing-wrapper .ds-table th{color:var(--muted);font-weight:500;font-family:var(--font-mono);letter-spacing:.06em;text-transform:uppercase;font-size:11px}.landing-wrapper .ds-table tbody tr:hover{background:var(--fg-soft)}.landing-wrapper .ds-table .check{color:var(--success)}.landing-wrapper .ds-table .partial{color:#d97706}.landing-wrapper .ds-table .cross{color:var(--muted);opacity:.6}.landing-wrapper .hero{padding-block:clamp(80px,12vw,160px)}.landing-wrapper .hero-split{gap:var(--gap-2xl);grid-template-columns:1fr 1fr;align-items:center;display:grid}@media (max-width:920px){.landing-wrapper .hero-split{grid-template-columns:1fr}}.landing-wrapper .hero h1{margin-bottom:var(--gap-md)}.landing-wrapper .hero .lead{margin-bottom:var(--gap-lg)}.landing-wrapper .hero-cta{gap:var(--gap-sm);flex-wrap:wrap;margin-top:28px;display:inline-flex}.landing-wrapper .trust-line{align-items:center;gap:var(--gap-md);margin-top:var(--gap-lg);font-size:var(--fs-small);color:var(--muted);flex-wrap:wrap;display:flex}.landing-wrapper .trust-line span{align-items:center;gap:6px;display:flex}.landing-wrapper .trust-line svg{color:var(--success)}.landing-wrapper .kbd-hint{margin-top:var(--gap-md);color:var(--muted);align-items:center;gap:6px;font-size:12px;display:flex}.landing-wrapper .kbd-hint kbd{background:var(--fg-soft);border:1px solid var(--border);font-family:var(--font-mono);color:var(--fg);border-radius:4px;justify-content:center;align-items:center;padding:2px 6px;font-size:11px;line-height:1;transition:all .15s;display:inline-flex}.landing-wrapper .mockup-wrap{position:relative}.landing-wrapper .mockup-wrap:before{content:"";pointer-events:none;z-index:0;background:radial-gradient(#1d6af51a 0%,#0000 68%);border-radius:50%;position:absolute;inset:-48px}.landing-wrapper .mockup{z-index:1;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);transition:transform .5s cubic-bezier(.16,1,.3,1),box-shadow .5s;position:relative;overflow:hidden;transform:rotate(1.5deg);box-shadow:0 8px 40px #0000001a}.landing-wrapper .mockup:hover{transform:rotate(0)translateY(-4px);box-shadow:0 16px 60px #00000024}.landing-wrapper .mockup-bar{background:var(--bg);border-bottom:1px solid var(--border);align-items:center;gap:6px;padding:10px 16px;display:flex}.landing-wrapper .mockup-dot{background:var(--border);border-radius:50%;width:10px;height:10px}.landing-wrapper .mockup-dot:first-child{background:#ef4444}.landing-wrapper .mockup-dot:nth-child(2){background:#f59e0b}.landing-wrapper .mockup-dot:nth-child(3){background:#10b981}.landing-wrapper .mockup-body{padding:20px}.landing-wrapper .mockup-meta{font-family:var(--font-mono);color:var(--muted);letter-spacing:.02em;margin-bottom:14px;font-size:11px}.landing-wrapper .mockup-q{color:var(--fg);margin-bottom:14px;font-size:15px;font-weight:500;line-height:1.5}.landing-wrapper .mockup-opts{flex-direction:column;gap:8px;display:flex}.landing-wrapper .mockup-opt{border:1px solid var(--border);border-radius:var(--radius);color:var(--muted);align-items:center;gap:10px;padding:10px 14px;font-size:13px;transition:all .12s;display:flex}.landing-wrapper .mockup-opt:hover{border-color:color-mix(in oklch, var(--accent) 40%, var(--border));color:var(--fg)}.landing-wrapper .mockup-opt.correct{border-color:var(--success);background:color-mix(in oklch, var(--success) 8%, transparent);color:var(--success)}.landing-wrapper .mockup-radio{border:2px solid var(--border);border-radius:50%;flex-shrink:0;width:16px;height:16px;transition:all .12s}.landing-wrapper .mockup-opt.correct .mockup-radio{border-color:var(--success);background:var(--success);box-shadow:inset 0 0 0 3px #fff}.landing-wrapper .mockup-footer{border-top:1px solid var(--border);font-family:var(--font-mono);color:var(--muted);justify-content:space-between;align-items:center;margin-top:14px;padding-top:14px;font-size:11px;display:flex}.landing-wrapper .mockup-footer strong{color:var(--fg);font-weight:600}@media (max-width:920px){.landing-wrapper .mockup{display:none}}.landing-wrapper .timeline{gap:var(--gap-lg);grid-template-columns:repeat(3,1fr);display:grid;position:relative}.landing-wrapper .timeline:before{content:"";background:var(--border);height:1px;position:absolute;top:20px;left:calc(16.67% + 12px);right:calc(16.67% + 12px)}.landing-wrapper .tl-step{text-align:center;z-index:1;position:relative}.landing-wrapper .tl-dot{background:var(--surface);border:1px solid var(--border);width:40px;height:40px;margin:0 auto var(--gap-md);color:var(--muted);border-radius:50%;place-items:center;transition:all .2s;display:grid}.landing-wrapper .tl-step:hover .tl-dot{border-color:var(--accent);color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}.landing-wrapper .tl-step h3{margin-bottom:4px;font-size:16px}.landing-wrapper .tl-step p{color:var(--muted);max-width:26ch;margin-inline:auto;font-size:14px;line-height:1.5}.landing-wrapper .tl-label{font-family:var(--font-mono);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:10px;font-size:10px}@media (max-width:768px){.landing-wrapper .timeline{gap:var(--gap-xl);grid-template-columns:1fr}.timeline:before{display:none}}.landing-wrapper .demo-browser{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);max-width:680px;margin-inline:auto;overflow:hidden;box-shadow:0 4px 24px #00000012}.landing-wrapper .demo-bar{background:var(--bg);border-bottom:1px solid var(--border);align-items:center;gap:6px;padding:10px 16px;display:flex}.landing-wrapper .demo-bar span{background:var(--border);border-radius:50%;width:10px;height:10px}.landing-wrapper .demo-bar span:first-child{background:#ef4444}.landing-wrapper .demo-bar span:nth-child(2){background:#f59e0b}.landing-wrapper .demo-bar span:nth-child(3){background:#10b981}.landing-wrapper .demo-bar-label{font-family:var(--font-mono);color:var(--muted);margin-left:8px;font-size:11px}.landing-wrapper .demo-body{padding:24px}.landing-wrapper .demo-head{margin-bottom:var(--gap-md);font-size:var(--fs-small);color:var(--muted);justify-content:space-between;align-items:center;display:flex}.landing-wrapper .demo-head strong{color:var(--fg)}.landing-wrapper .demo-question{margin-bottom:var(--gap-md);font-size:16px;font-weight:500;line-height:1.55}.landing-wrapper .demo-opts{flex-direction:column;gap:8px;display:flex}.landing-wrapper .demo-opt{border:1px solid var(--border);border-radius:var(--radius);color:var(--muted);cursor:pointer;-webkit-user-select:none;user-select:none;align-items:center;gap:12px;padding:12px 16px;font-size:15px;transition:all .12s;display:flex}.landing-wrapper .demo-opt:hover{border-color:color-mix(in oklch, var(--accent) 40%, var(--border));color:var(--fg)}.landing-wrapper .demo-opt.selected{border-color:var(--accent);background:var(--accent-soft);color:var(--fg)}.landing-wrapper .demo-opt.correct{border-color:var(--success);background:color-mix(in oklch, var(--success) 8%, transparent);color:var(--success)}.landing-wrapper .demo-opt.wrong{color:#dc2626;background:#dc26260f;background:lab(48.7982% 67.6999 48.8037/.06);border-color:#dc2626}.landing-wrapper .demo-radio{border:2px solid var(--border);border-radius:50%;flex-shrink:0;width:18px;height:18px;transition:all .12s}.landing-wrapper .demo-opt.selected .demo-radio{border-color:var(--accent);background:var(--accent);box-shadow:inset 0 0 0 3px #fff}.landing-wrapper .demo-opt.correct .demo-radio{border-color:var(--success);background:var(--success);box-shadow:inset 0 0 0 3px #fff}.landing-wrapper .demo-opt.wrong .demo-radio{background:#dc2626;border-color:#dc2626;box-shadow:inset 0 0 0 3px #fff}.landing-wrapper .demo-fb{margin-top:var(--gap-md);border-radius:var(--radius);padding:14px 16px;font-size:14px;line-height:1.6;display:none}.landing-wrapper .demo-fb.show{display:block}.landing-wrapper .demo-fb.correct{background:color-mix(in oklch, var(--success) 8%, transparent);color:#065f46;border:1px solid color-mix(in oklch, var(--success) 20%, transparent)}.landing-wrapper .demo-fb.wrong{color:#991b1b;background:#dc26260f;background:lab(48.7982% 67.6999 48.8037/.06);border:1px solid #dc262626;border:1px solid lab(48.7982% 67.6999 48.8037/.15)}.landing-wrapper .demo-nav{margin-top:var(--gap-md);padding-top:var(--gap-md);border-top:1px solid var(--border);font-size:var(--fs-small);color:var(--muted);justify-content:space-between;align-items:center;display:flex}.landing-wrapper .demo-nav strong{color:var(--fg)}.landing-wrapper .syllabus-tabs{margin-bottom:var(--gap-lg);border-bottom:1px solid var(--border);gap:4px;display:flex}.landing-wrapper .syllabus-tab{font-size:var(--fs-small);color:var(--muted);cursor:pointer;letter-spacing:-.005em;background:0 0;border:none;border-bottom:2px solid #0000;margin-bottom:-1px;padding:10px 20px;font-weight:600;transition:all .12s}.landing-wrapper .syllabus-tab:hover{color:var(--fg)}.landing-wrapper .syllabus-tab.active{color:var(--accent);border-bottom-color:var(--accent)}.landing-wrapper .syllabus-panel{display:none}.landing-wrapper .syllabus-panel.active{display:block}.landing-wrapper .unit-row{align-items:center;gap:var(--gap-md);border-bottom:1px solid var(--border);grid-template-columns:40px 1fr 70px;padding:12px 0;display:grid}.landing-wrapper .unit-row:last-child{border-bottom:none}.landing-wrapper .unit-num{background:var(--fg-soft);width:28px;height:28px;font-family:var(--font-mono);color:var(--muted);border-radius:50%;place-items:center;font-size:11px;font-weight:600;display:grid}.landing-wrapper .unit-name{color:var(--fg);font-size:15px}.landing-wrapper .unit-count{font-family:var(--font-mono);font-size:var(--fs-small);color:var(--muted);text-align:right;font-variant-numeric:tabular-nums}.landing-wrapper .syllabus-total{margin-top:var(--gap-md);background:var(--accent-soft);border-radius:var(--radius);justify-content:space-between;align-items:center;padding:14px 18px;font-size:15px;font-weight:600;display:flex}.landing-wrapper .syllabus-total .num{color:var(--accent);font-size:18px}.landing-wrapper .faq-list{max-width:720px;margin-inline:auto}.landing-wrapper .faq-item{border-bottom:1px solid var(--border)}.landing-wrapper .faq-q{width:100%;color:var(--fg);text-align:left;cursor:pointer;justify-content:space-between;align-items:center;gap:var(--gap-md);background:0 0;border:none;padding:18px 0;font-size:15px;font-weight:600;transition:color .12s;display:flex}.landing-wrapper .faq-q:hover{color:var(--accent)}.landing-wrapper .faq-chevron{width:18px;height:18px;color:var(--muted);flex-shrink:0;transition:transform .2s}.landing-wrapper .faq-item.open .faq-chevron{transform:rotate(180deg)}.landing-wrapper .faq-a{max-height:0;transition:max-height .3s;overflow:hidden}.landing-wrapper .faq-a-inner{color:var(--muted);max-width:60ch;padding-bottom:18px;font-size:15px;line-height:1.65}.landing-wrapper .cta-accent{background:var(--accent);border-top:none}.landing-wrapper .cta-accent h2{color:#fff;letter-spacing:-.02em}.landing-wrapper .cta-accent .lead{color:#ffffffc7}.landing-wrapper .cta-accent .btn-cta-white{color:var(--accent);background:#fff;border:none;border-radius:10px;align-items:center;gap:8px;padding:13px 28px;font-size:16px;font-weight:600;transition:transform 60ms,box-shadow .15s;display:inline-flex;box-shadow:0 2px 8px #0000001f}.landing-wrapper .cta-accent .btn-cta-white:hover{transform:translateY(-1px);box-shadow:0 4px 16px #0000002e}.landing-wrapper .cta-accent .btn-cta-white:active{transform:translateY(0)}.landing-wrapper .cta-accent .btn-cta-ghost{color:#ffffffd9;background:0 0;border:1px solid #ffffff40;border-radius:10px;align-items:center;gap:8px;padding:13px 20px;font-size:15px;font-weight:500;transition:background .15s,border-color .15s;display:inline-flex}.landing-wrapper .cta-accent .btn-cta-ghost:hover{background:#ffffff1a;border-color:#ffffff73}.landing-wrapper .pagefoot{padding-block:var(--gap-xl);color:var(--muted);font-size:var(--fs-meta);border-top:1px solid var(--border)}.landing-wrapper .pagefoot .row-between{gap:var(--gap-md);flex-wrap:wrap}.landing-wrapper .pagefoot nav a{transition:color .15s}.landing-wrapper .pagefoot nav a:hover{color:var(--fg)}.landing-wrapper .mobile-nav{z-index:50;background:var(--surface);border-top:1px solid var(--border);display:none;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -4px 24px #0000000d}.landing-wrapper .mobile-nav-inner{justify-content:space-around;align-items:center;height:64px;display:flex}.landing-wrapper .mobile-nav a{width:100%;height:100%;color:var(--muted);flex-direction:column;justify-content:center;align-items:center;gap:4px;font-size:10px;font-weight:500;transition:color .15s;display:flex}.landing-wrapper .mobile-nav a.active{color:var(--accent)}.landing-wrapper .mobile-nav a svg{width:20px;height:20px}@media (max-width:640px){.landing-wrapper .mobile-nav{display:block}body{padding-bottom:64px}}.landing-wrapper .sr-only{clip:rect(0,0,0,0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}
