:root{
    --bg:#ffffff;
    --bg-soft:#f8fafc;
    --bg-soft-2:#f1f5f9;
    --ink:#0f172a;
    --ink-soft:#475569;
    --ink-faint:#94a3b8;
    --border:#e2e8f0;
    --border-soft:#eef1f5;
    --primary:#4f46e5;
    --primary-dark:#4338ca;
    --primary-soft:#eef2ff;
    --primary-softer:#f5f6ff;
    --success:#059669;
    --success-soft:#ecfdf5;
    --danger:#dc2626;
    --danger-soft:#fef2f2;
    --shadow-sm: 0 1px 2px rgba(15,23,42,0.04), 0 1px 1px rgba(15,23,42,0.03);
    --shadow-md: 0 8px 24px rgba(15,23,42,0.06), 0 2px 6px rgba(15,23,42,0.04);
    --shadow-lg: 0 24px 48px -12px rgba(15,23,42,0.12), 0 8px 16px -4px rgba(15,23,42,0.04);
    --shadow-glow: 0 12px 32px rgba(79,70,229,0.18);
    --r-lg: 24px;
    --r-md: 16px;
    --r-sm: 12px;
    --r-xs: 8px;
    --ease: cubic-bezier(.22,1,.36,1);
  }

  *,*::before,*::after{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  @media (prefers-reduced-motion: reduce){
    html{scroll-behavior:auto;}
    *,*::before,*::after{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important;}
  }

  body{
    margin:0;
    font-family:'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color:var(--ink);
    background:var(--bg);
    -webkit-font-smoothing:antialiased;
    line-height:1.5;
  }
  h1,h2,h3,h4{
    font-family:'Plus Jakarta Sans', 'Inter', sans-serif;
    margin:0;
    letter-spacing:-0.02em;
    color:var(--ink);
  }
  p{margin:0;}
  img{max-width:100%; display:block;}
  button{font-family:inherit; cursor:pointer;}
  a{text-decoration:none; color:inherit;}

  .container{
    max-width:1160px;
    margin:0 auto;
    padding:0 24px;
  }

  /* ---------- Buttons ---------- */
  .btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    border:none;
    border-radius:var(--r-sm);
    font-weight:600;
    font-size:15px;
    padding:13px 24px;
    transition:transform .18s var(--ease), box-shadow .18s var(--ease), background .18s var(--ease), color .18s var(--ease);
    white-space:nowrap;
  }
  .btn:active{transform:scale(0.97);}
  .btn-primary{
    background:var(--primary);
    color:#fff;
    box-shadow:var(--shadow-glow);
  }
  .btn-primary:hover{background:var(--primary-dark); box-shadow:0 16px 36px rgba(79,70,229,0.24); transform:translateY(-1px);}
  .btn-primary:disabled{background:#c7c9f5; box-shadow:none; cursor:not-allowed; transform:none;}
  .btn-secondary{
    background:#fff;
    color:var(--ink);
    border:1.5px solid var(--border);
  }
  .btn-secondary:hover{border-color:#c7cbd4; background:var(--bg-soft); transform:translateY(-1px);}
  .btn-ghost{
    background:transparent;
    color:var(--ink-soft);
    padding:13px 18px;
  }
  .btn-ghost:hover{color:var(--ink); background:var(--bg-soft);}
  .btn-block{width:100%;}
  .btn-lg{padding:15px 28px; font-size:15.5px;}

  /* ---------- Navbar ---------- */
  header.nav{
    position:sticky;
    top:0;
    z-index:100;
    background:rgba(255,255,255,0.82);
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
    border-bottom:1px solid var(--border-soft);
  }
  .nav-inner{
    display:flex;
    align-items:center;
    justify-content:space-between;
    height:72px;
  }
  .logo{
    display:flex;
    align-items:center;
    gap:10px;
    font-family:'Plus Jakarta Sans', sans-serif;
    font-weight:700;
    font-size:19px;
    color:var(--ink);
  }
  .logo-mark{
    width:34px; height:34px;
    border-radius:10px;
    background:linear-gradient(135deg,var(--primary),#7c74f2);
    display:flex; align-items:center; justify-content:center;
    box-shadow:0 6px 16px rgba(79,70,229,0.28);
    flex-shrink:0;
  }
  .nav-links{
    display:flex;
    align-items:center;
    gap:4px;
  }
  .nav-links a{
    font-size:14.5px;
    font-weight:500;
    color:var(--ink-soft);
    padding:10px 16px;
    border-radius:var(--r-xs);
    transition:color .15s, background .15s;
  }
  .nav-links a:hover{color:var(--ink); background:var(--bg-soft);}
  .nav-right{display:flex; align-items:center; gap:12px;}
  .hamburger{
    display:none;
    background:none; border:none;
    width:40px; height:40px;
    align-items:center; justify-content:center;
    border-radius:var(--r-xs);
  }
  .hamburger:hover{background:var(--bg-soft);}
  .hamburger span{
    display:block; width:20px; height:2px; background:var(--ink);
    position:relative; transition:all .25s var(--ease);
  }
  .hamburger span::before,.hamburger span::after{
    content:''; position:absolute; width:20px; height:2px; background:var(--ink);
    left:0; transition:all .25s var(--ease);
  }
  .hamburger span::before{top:-6px;}
  .hamburger span::after{top:6px;}
  .hamburger.open span{background:transparent;}
  .hamburger.open span::before{top:0; transform:rotate(45deg);}
  .hamburger.open span::after{top:0; transform:rotate(-45deg);}

  .mobile-menu{
    display:none;
    flex-direction:column;
    border-top:1px solid var(--border-soft);
    background:#fff;
    padding:8px 24px 20px;
  }
  .mobile-menu.open{display:flex;}
  .mobile-menu a{
    padding:14px 4px;
    font-size:15.5px;
    font-weight:500;
    color:var(--ink-soft);
    border-bottom:1px solid var(--border-soft);
  }
  .mobile-menu .btn{margin-top:14px;}

  @media (max-width:860px){
    .nav-links{display:none;}
    .nav-right .btn{display:none;}
    .hamburger{display:flex;}
  }

  /* ---------- Sections ---------- */
  section{padding:96px 0;}
  .section-alt{background:var(--bg-soft);}
  .eyebrow{
    display:inline-flex;
    align-items:center;
    gap:8px;
    font-size:12.5px;
    font-weight:700;
    letter-spacing:0.06em;
    text-transform:uppercase;
    color:var(--primary);
    background:var(--primary-soft);
    padding:7px 14px;
    border-radius:100px;
    margin-bottom:20px;
  }
  .section-head{text-align:center; max-width:620px; margin:0 auto 56px;}
  .section-head h2{font-size:clamp(28px,4vw,38px); font-weight:700; margin-bottom:14px;}
  .section-head p{font-size:16.5px; color:var(--ink-soft); line-height:1.65;}

  /* ---------- Hero ---------- */
  .hero{padding:76px 0 40px; text-align:center;}
  .hero h1{
    font-size:clamp(34px,5.4vw,58px);
    font-weight:800;
    line-height:1.08;
    max-width:820px;
    margin:0 auto 22px;
  }
  .hero .accent{
    background:linear-gradient(100deg,var(--primary),#8b7ff5 60%, var(--primary));
    -webkit-background-clip:text; background-clip:text; color:transparent;
  }
  .hero p.sub{
    font-size:18px;
    color:var(--ink-soft);
    max-width:540px;
    margin:0 auto 48px;
    line-height:1.6;
  }

  /* ---------- Upload Box ---------- */
  .upload-wrap{max-width:640px; margin:0 auto;}
  .upload-box{
    position:relative;
    background:#fff;
    border:2px dashed var(--border);
    border-radius:var(--r-lg);
    padding:56px 32px;
    text-align:center;
    transition:border-color .2s var(--ease), background .2s var(--ease), transform .2s var(--ease), box-shadow .2s var(--ease);
    box-shadow:var(--shadow-md);
  }
  .upload-box:hover{
    border-color:var(--primary);
    background:var(--primary-softer);
    box-shadow:var(--shadow-lg);
  }
  .upload-box.drag-over{
    border-color:var(--primary);
    background:var(--primary-soft);
    transform:scale(1.015);
    box-shadow:0 20px 44px rgba(79,70,229,0.18);
  }
  .upload-icon{
    width:68px; height:68px;
    margin:0 auto 22px;
    border-radius:18px;
    background:var(--primary-soft);
    display:flex; align-items:center; justify-content:center;
    color:var(--primary);
    transition:transform .3s var(--ease);
  }
  .upload-box:hover .upload-icon{transform:translateY(-3px);}
  .upload-box h3{font-size:20px; font-weight:700; margin-bottom:8px;}
  .upload-box .drop-text{color:var(--ink-soft); font-size:15px; margin-bottom:6px;}
  .upload-box .or{color:var(--ink-faint); font-size:13px; margin:10px 0;}
  .upload-box input[type=file]{display:none;}
  .upload-formats{
    margin-top:22px;
    font-size:13px;
    font-weight:600;
    letter-spacing:0.04em;
    color:var(--ink-faint);
  }
  .privacy-note{
    display:flex; align-items:center; justify-content:center; gap:8px;
    margin-top:20px;
    font-size:13.5px;
    color:var(--ink-faint);
  }
  .privacy-note svg{flex-shrink:0; color:#94a3b8;}

  /* ---------- Workspace ---------- */
  .workspace{max-width:960px; margin:0 auto;}
  .workspace-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:24px;
    align-items:stretch;
  }
  @media (max-width:760px){
    .workspace-grid{grid-template-columns:1fr;}
  }
  .card{
    background:#fff;
    border:1px solid var(--border-soft);
    border-radius:var(--r-lg);
    box-shadow:var(--shadow-md);
    padding:28px;
  }
  .preview-frame{
    width:100%;
    aspect-ratio:4/3;
    border-radius:var(--r-md);
    overflow:hidden;
    background:var(--bg-soft-2);
    border:1px solid var(--border-soft);
    margin-bottom:18px;
    display:flex; align-items:center; justify-content:center;
  }
  .preview-frame img{width:100%; height:100%; object-fit:contain;}
  .file-meta .fname{
    font-weight:700; font-size:15.5px; color:var(--ink);
    overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
    margin-bottom:4px;
  }
  .file-meta .fsub{font-size:13.5px; color:var(--ink-soft);}
  .tag-row{display:flex; gap:8px; margin-top:16px; flex-wrap:wrap;}
  .tag{
    font-size:12px; font-weight:600; color:var(--ink-soft);
    background:var(--bg-soft); border:1px solid var(--border-soft);
    padding:6px 10px; border-radius:100px;
  }

  .settings-card h3{font-size:19px; font-weight:700; margin-bottom:22px;}
  .field-label{
    display:flex; justify-content:space-between; align-items:center;
    font-size:14px; font-weight:600; color:var(--ink);
    margin-bottom:14px;
  }
  .field-label .val{color:var(--primary); font-weight:700;}

  .slider-wrap{margin-bottom:8px;}
  input[type=range]{
    -webkit-appearance:none;
    appearance:none;
    width:100%;
    height:6px;
    border-radius:4px;
    background:var(--border);
    outline:none;
    margin:10px 0;
  }
  input[type=range]::-webkit-slider-runnable-track{
    height:6px; border-radius:4px;
  }
  input[type=range]::-webkit-slider-thumb{
    -webkit-appearance:none;
    width:22px; height:22px;
    border-radius:50%;
    background:#fff;
    border:3px solid var(--primary);
    box-shadow:0 2px 8px rgba(79,70,229,0.35);
    margin-top:-8px;
    cursor:pointer;
    transition:transform .15s var(--ease);
  }
  input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.12);}
  input[type=range]::-moz-range-thumb{
    width:22px; height:22px;
    border-radius:50%;
    background:#fff;
    border:3px solid var(--primary);
    box-shadow:0 2px 8px rgba(79,70,229,0.35);
    cursor:pointer;
  }
  input[type=range]::-moz-range-track{height:6px; border-radius:4px; background:var(--border);}

  .slider-scale{
    display:flex; justify-content:space-between;
    font-size:12px; color:var(--ink-faint); font-weight:600;
    margin-top:2px;
  }
  .quality-labels{display:flex; justify-content:space-between; font-size:11.5px; color:var(--ink-faint); margin-top:4px;}

  .estimate-box{
    display:flex; align-items:center; justify-content:space-between;
    background:var(--bg-soft);
    border:1px solid var(--border-soft);
    border-radius:var(--r-sm);
    padding:14px 16px;
    margin:22px 0 26px;
  }
  .estimate-box .label{font-size:13px; color:var(--ink-soft); font-weight:600;}
  .estimate-box .amount{font-size:16px; font-weight:800; color:var(--ink);}

  .settings-actions{display:flex; flex-direction:column; gap:10px;}

  /* ---------- Loader ---------- */
  .loader-card{
    max-width:480px; margin:0 auto;
    text-align:center;
    padding:52px 32px;
  }
  .loader-ring{
    width:64px; height:64px;
    margin:0 auto 24px;
    border-radius:50%;
    border:4px solid var(--primary-soft);
    border-top-color:var(--primary);
    animation:spin 0.9s linear infinite;
  }
  @keyframes spin{to{transform:rotate(360deg);}}
  .loader-card h3{font-size:19px; font-weight:700; margin-bottom:8px;}
  .loader-card p{color:var(--ink-soft); font-size:14.5px; margin-bottom:26px;}
  .progress-track{
    width:100%; height:8px; border-radius:8px;
    background:var(--bg-soft-2); overflow:hidden;
  }
  .progress-fill{
    height:100%; width:0%;
    background:linear-gradient(90deg,var(--primary),#8b7ff5);
    border-radius:8px;
    transition:width .25s var(--ease);
  }
  .progress-pct{margin-top:10px; font-size:13px; font-weight:700; color:var(--primary);}

  /* ---------- Result ---------- */
  .result-wrap{max-width:960px; margin:0 auto;}
  .result-badge{
    display:flex; flex-direction:column; align-items:center;
    text-align:center; margin-bottom:44px;
  }
  .result-badge .check{
    width:60px; height:60px; border-radius:50%;
    background:var(--success-soft); color:var(--success);
    display:flex; align-items:center; justify-content:center;
    margin-bottom:18px;
    animation:pop .45s var(--ease);
  }
  @keyframes pop{
    0%{transform:scale(0); opacity:0;}
    60%{transform:scale(1.12);}
    100%{transform:scale(1); opacity:1;}
  }
  .result-badge h2{font-size:clamp(26px,4vw,34px); font-weight:800; margin-bottom:8px;}
  .result-badge p{color:var(--ink-soft); font-size:15.5px;}

  .compare-grid{
    display:grid; grid-template-columns:1fr 1fr; gap:20px;
    margin-bottom:28px;
  }
  @media (max-width:760px){.compare-grid{grid-template-columns:1fr;}}
  .compare-card{
    background:#fff; border:1px solid var(--border-soft);
    border-radius:var(--r-lg); overflow:hidden;
    box-shadow:var(--shadow-md);
    animation:reveal .5s var(--ease) both;
  }
  .compare-card:nth-child(2){animation-delay:.08s;}
  @keyframes reveal{
    from{opacity:0; transform:translateY(14px);}
    to{opacity:1; transform:translateY(0);}
  }
  .compare-head{
    display:flex; align-items:center; justify-content:space-between;
    padding:14px 20px;
    border-bottom:1px solid var(--border-soft);
  }
  .compare-head .tag-label{
    font-size:11.5px; font-weight:800; letter-spacing:0.06em; text-transform:uppercase;
    color:var(--ink-faint);
  }
  .compare-card.is-compressed .compare-head .tag-label{color:var(--success);}
  .compare-head .size{font-size:14.5px; font-weight:700;}
  .compare-img{
    aspect-ratio:4/3; background:var(--bg-soft-2);
    display:flex; align-items:center; justify-content:center; overflow:hidden;
  }
  .compare-img img{width:100%; height:100%; object-fit:contain;}

  .stats-row{
    display:grid; grid-template-columns:repeat(4,1fr); gap:14px;
    margin-bottom:32px;
  }
  @media (max-width:700px){.stats-row{grid-template-columns:repeat(2,1fr);}}
  .stat-box{
    background:#fff; border:1px solid var(--border-soft); border-radius:var(--r-md);
    padding:18px; text-align:center; box-shadow:var(--shadow-sm);
  }
  .stat-box .stat-label{font-size:12px; font-weight:700; color:var(--ink-faint); text-transform:uppercase; letter-spacing:0.04em; margin-bottom:6px;}
  .stat-box .stat-val{font-size:20px; font-weight:800; color:var(--ink);}
  .stat-box.highlight{
    background:linear-gradient(135deg,var(--primary),#6a62ee);
    border:none;
  }
  .stat-box.highlight .stat-label{color:rgba(255,255,255,0.75);}
  .stat-box.highlight .stat-val{color:#fff; font-size:24px;}

  .result-actions{display:flex; gap:14px; justify-content:center; flex-wrap:wrap;}
  @media (max-width:520px){.result-actions{flex-direction:column;} .result-actions .btn{width:100%;}}

  /* ---------- How it works ---------- */
  .steps-grid{
    display:grid; grid-template-columns:repeat(3,1fr); gap:24px;
  }
  @media (max-width:800px){.steps-grid{grid-template-columns:1fr;}}
  .step-card{
    background:#fff; border:1px solid var(--border-soft); border-radius:var(--r-lg);
    padding:32px 28px; position:relative;
    box-shadow:var(--shadow-sm);
    transition:transform .25s var(--ease), box-shadow .25s var(--ease);
  }
  .step-card:hover{transform:translateY(-4px); box-shadow:var(--shadow-md);}
  .step-num{
    font-family:'Plus Jakarta Sans', sans-serif;
    font-size:14px; font-weight:800; color:var(--primary);
    background:var(--primary-soft);
    display:inline-flex; padding:6px 12px; border-radius:8px;
    margin-bottom:20px;
  }
  .step-icon{
    width:44px; height:44px; border-radius:12px;
    background:var(--bg-soft); color:var(--primary);
    display:flex; align-items:center; justify-content:center;
    margin-bottom:16px;
  }
  .step-card h3{font-size:18px; font-weight:700; margin-bottom:8px;}
  .step-card p{color:var(--ink-soft); font-size:14.5px; line-height:1.6;}

  /* ---------- Features ---------- */
  .features-grid{
    display:grid; grid-template-columns:repeat(4,1fr); gap:20px;
  }
  @media (max-width:900px){.features-grid{grid-template-columns:repeat(2,1fr);}}
  @media (max-width:520px){.features-grid{grid-template-columns:1fr;}}
  .feature-card{
    background:#fff; border:1px solid var(--border-soft); border-radius:var(--r-md);
    padding:26px 22px;
    transition:transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s;
  }
  .feature-card:hover{transform:translateY(-3px); box-shadow:var(--shadow-md); border-color:transparent;}
  .feature-icon{
    width:42px; height:42px; border-radius:11px;
    background:var(--primary-soft); color:var(--primary);
    display:flex; align-items:center; justify-content:center;
    margin-bottom:16px;
  }
  .feature-card h4{font-size:16px; font-weight:700; margin-bottom:6px;}
  .feature-card p{font-size:13.5px; color:var(--ink-soft); line-height:1.55;}

  /* ---------- Footer ---------- */
  footer{
    border-top:1px solid var(--border-soft);
    padding:52px 0 32px;
  }
  .footer-top{
    display:flex; justify-content:space-between; align-items:flex-start;
    flex-wrap:wrap; gap:28px; margin-bottom:36px;
  }
  .footer-brand p{color:var(--ink-soft); font-size:14px; margin-top:10px; max-width:280px;}
  .footer-links{display:flex; gap:28px; flex-wrap:wrap;}
  .footer-links a{font-size:14px; color:var(--ink-soft); font-weight:500;}
  .footer-links a:hover{color:var(--primary);}
  .footer-bottom{
    border-top:1px solid var(--border-soft); padding-top:24px;
    font-size:13px; color:var(--ink-faint);
    text-align:center;
  }

  /* ---------- Toast ---------- */
  .toast-stack{
    position:fixed; top:24px; right:24px; z-index:999;
    display:flex; flex-direction:column; gap:10px;
    max-width:360px;
    width:calc(100% - 32px);
  }
  @media (max-width:520px){.toast-stack{left:16px; right:16px; top:16px; max-width:none;}}
  .toast{
    background:#fff; border:1px solid var(--border-soft); border-radius:var(--r-sm);
    box-shadow:var(--shadow-lg);
    padding:14px 16px;
    display:flex; gap:12px; align-items:flex-start;
    animation:toast-in .3s var(--ease);
  }
  @keyframes toast-in{from{opacity:0; transform:translateX(16px);} to{opacity:1; transform:translateX(0);}}
  .toast.leaving{animation:toast-out .25s var(--ease) forwards;}
  @keyframes toast-out{to{opacity:0; transform:translateX(16px) scale(.96);}}
  .toast-icon{
    width:34px; height:34px; border-radius:9px; flex-shrink:0;
    display:flex; align-items:center; justify-content:center;
  }
  .toast.error .toast-icon{background:var(--danger-soft); color:var(--danger);}
  .toast.success .toast-icon{background:var(--success-soft); color:var(--success);}
  .toast-body .t-title{font-size:14px; font-weight:700; margin-bottom:2px;}
  .toast-body .t-msg{font-size:13px; color:var(--ink-soft); line-height:1.45;}
  .toast-close{
    margin-left:auto; background:none; border:none; color:var(--ink-faint);
    width:22px; height:22px; flex-shrink:0; border-radius:6px;
    display:flex; align-items:center; justify-content:center;
  }
  .toast-close:hover{background:var(--bg-soft); color:var(--ink);}

  /* ---------- Utility / reveal ---------- */
  .reveal{opacity:0; transform:translateY(18px); transition:opacity .6s var(--ease), transform .6s var(--ease);}
  .reveal.in{opacity:1; transform:translateY(0);}

  .fade-swap-enter{animation:fadeSwap .4s var(--ease);}
  @keyframes fadeSwap{from{opacity:0; transform:translateY(10px);} to{opacity:1; transform:translateY(0);}}

  [hidden]{display:none !important;}

  .visually-hidden{
    position:absolute; width:1px; height:1px; overflow:hidden;
    clip:rect(0 0 0 0); white-space:nowrap;
  }

  :focus-visible{
    outline:2.5px solid var(--primary);
    outline-offset:2px;
  }