/* ===== Design tokens ===== */
:root{
  --bg:#F3F5FA;
  --surface:#FFFFFF;
  --ink:#12172B;
  --ink-soft:#4A5170;
  --ink-faint:#8890AC;
  --accent:#5B5FEF;
  --accent-dark:#4247C4;
  --accent-2:#F2A93B;
  --success:#1F8A70;
  --border:#E2E6F0;
  --radius-sm:10px;
  --radius-md:16px;
  --radius-lg:28px;
  --shadow-sm:0 2px 8px rgba(18,23,43,0.06);
  --shadow-md:0 12px 32px rgba(18,23,43,0.10);
  --font-display:'Space Grotesk', sans-serif;
  --font-body:'Inter', sans-serif;
  --font-mono:'JetBrains Mono', monospace;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--bg);
  color:var(--ink);
  font-family:var(--font-body);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-display); margin:0; letter-spacing:-0.02em;}
p{margin:0; color:var(--ink-soft); line-height:1.6;}
a{color:inherit;}
button{font-family:var(--font-body); cursor:pointer;}
.hidden{display:none !important;}
.container{max-width:1160px; margin:0 auto; padding:0 24px;}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.001ms !important; transition-duration:0.001ms !important;}
}

/* ===== Reveal on scroll ===== */
.reveal{opacity:0; transform:translateY(24px); transition:opacity .6s ease, transform .6s ease;}
.reveal.visible{opacity:1; transform:translateY(0);}

/* ===== Top nav ===== */
.topnav{
  position:sticky; top:0; z-index:50;
  background:rgba(243,245,250,0.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--border);
}
.topnav-inner{
  max-width:1160px; margin:0 auto; padding:16px 24px;
  display:flex; align-items:center; justify-content:space-between;
}
.brand{display:flex; align-items:center; gap:10px; font-family:var(--font-display); font-weight:700; font-size:1.15rem;}
.brand-mark{
  width:32px; height:32px; border-radius:9px;
  background:linear-gradient(135deg, var(--accent), var(--accent-2));
  display:flex; align-items:center; justify-content:center;
  color:#fff; font-size:0.85rem; font-weight:700;
}
.nav-links{display:flex; align-items:center; gap:28px;}
.nav-links a{font-size:0.92rem; font-weight:500; text-decoration:none; color:var(--ink-soft); transition:color .2s;}
.nav-links a:hover{color:var(--accent);}
.nav-cta{
  background:var(--ink); color:#fff !important; padding:9px 18px; border-radius:100px;
  font-weight:600; font-size:0.88rem;
}
.lang-switch{display:flex; border:1px solid var(--border); border-radius:100px; overflow:hidden;}
.lang-switch button{
  border:none; background:transparent; padding:6px 12px; font-size:0.78rem; font-weight:600;
  color:var(--ink-faint); font-family:var(--font-mono);
}
.lang-switch button.active{background:var(--ink); color:#fff;}
.nav-toggle{display:none; background:none; border:none; font-size:1.4rem;}

@media (max-width: 860px){
  .nav-links{
    position:absolute; top:64px; left:0; right:0; background:var(--surface);
    flex-direction:column; align-items:flex-start; padding:20px 24px; gap:16px;
    border-bottom:1px solid var(--border); display:none;
  }
  .nav-links.open{display:flex;}
  .nav-toggle{display:block;}
}

/* ===== Hero ===== */
.hero{padding:72px 0 96px; position:relative; overflow:hidden;}
.hero-inner{display:grid; grid-template-columns:1.1fr 0.9fr; gap:56px; align-items:center;}
.eyebrow{
  font-family:var(--font-mono); font-size:0.78rem; text-transform:uppercase; letter-spacing:0.08em;
  color:var(--accent-dark); display:inline-flex; align-items:center; gap:8px; margin-bottom:18px;
}
.eyebrow::before{content:''; width:6px; height:6px; border-radius:50%; background:var(--accent-2);}
.hero h1{font-size:clamp(2.2rem, 4.2vw, 3.4rem); line-height:1.08; font-weight:700;}
.hero-rotate-wrap{display:inline-block; overflow:hidden; vertical-align:bottom;}
#heroRotate{
  display:inline-block; color:var(--accent); transition:opacity .22s ease, transform .22s ease;
}
.hero p.subtitle{margin-top:20px; font-size:1.08rem; max-width:480px;}
.hero-badges{display:flex; gap:10px; flex-wrap:wrap; margin-top:28px;}
.hero-badge{
  display:flex; align-items:center; gap:6px; background:var(--surface); border:1px solid var(--border);
  padding:7px 14px; border-radius:100px; font-size:0.8rem; font-weight:500; color:var(--ink-soft);
}
.hero-badge::before{content:'●'; color:var(--success); font-size:0.6rem;}

/* Hero dropzone card with orbiting format badges */
.hero-visual{position:relative; display:flex; align-items:center; justify-content:center; min-height:360px;}
.hero-dropzone{
  width:280px; height:280px; border-radius:32px; background:var(--surface);
  border:2px dashed var(--border); display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:14px; text-align:center; padding:24px; cursor:pointer; transition:border-color .2s, transform .2s, box-shadow .2s;
  box-shadow:var(--shadow-md); z-index:2; position:relative;
}
.hero-dropzone:hover, .hero-dropzone.dragover{border-color:var(--accent); transform:scale(1.02);}
.hero-dropzone .dz-icon-main{
  width:52px; height:52px; border-radius:16px; background:linear-gradient(135deg, var(--accent), #8B8EF5);
  display:flex; align-items:center; justify-content:center; color:#fff; font-size:1.4rem;
  animation:float 3s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:translateY(0);} 50%{transform:translateY(-6px);}}
.hero-dropzone p{font-size:0.85rem; margin:0;}
.hero-dropzone .dz-title{font-weight:600; color:var(--ink); font-size:0.95rem;}
.hero-dropzone .btn{margin-top:4px;}

.orbit-badge{
  position:absolute; width:56px; height:56px; border-radius:16px; background:var(--surface);
  border:1px solid var(--border); box-shadow:var(--shadow-sm); display:flex; align-items:center; justify-content:center;
  font-family:var(--font-mono); font-size:0.68rem; font-weight:700; color:var(--ink-soft);
  animation:orbit-pulse 5s ease-in-out infinite;
}
.orbit-badge.b1{top:-10px; left:-20px; animation-delay:0s;}
.orbit-badge.b2{top:20px; right:-30px; animation-delay:.6s;}
.orbit-badge.b3{bottom:30px; left:-40px; animation-delay:1.2s;}
.orbit-badge.b4{bottom:-16px; right:10px; animation-delay:1.8s;}
.orbit-badge.b5{top:-24px; right:60px; animation-delay:2.4s;}
@keyframes orbit-pulse{0%,100%{transform:translateY(0) scale(1); opacity:0.85;} 50%{transform:translateY(-8px) scale(1.05); opacity:1;}}

/* ===== Buttons ===== */
.btn{
  border-radius:100px; padding:12px 22px; font-weight:600; font-size:0.92rem; border:none;
  transition:transform .15s ease, box-shadow .15s ease, background .15s ease; white-space:nowrap;
}
.btn-primary{background:var(--ink); color:#fff;}
.btn-primary:hover{background:var(--accent-dark); transform:translateY(-1px);}
.btn-primary:disabled{background:var(--ink-faint); cursor:not-allowed; transform:none;}
.btn-secondary{background:var(--surface); color:var(--ink); border:1px solid var(--border);}
.btn-secondary:hover{border-color:var(--accent);}
.btn-ghost{background:transparent; color:var(--ink-soft); text-decoration:underline;}
.btn-large{padding:14px 30px; font-size:0.98rem; width:100%;}

/* ===== Tools section ===== */
.section{padding:88px 0;}
.section-head{max-width:640px; margin:0 auto 44px; text-align:center;}
.section-head h2{font-size:clamp(1.6rem, 3vw, 2.2rem); margin-top:8px;}
.section-head p{margin-top:12px; font-size:1.02rem;}
.tools-group-label{
  font-family:var(--font-mono); font-size:0.75rem; text-transform:uppercase; letter-spacing:0.06em;
  color:var(--ink-faint); margin:36px 0 16px; display:flex; align-items:center; gap:10px;
}
.tools-group-label::after{content:''; flex:1; height:1px; background:var(--border);}
.tools-grid{display:grid; grid-template-columns:repeat(3, 1fr); gap:16px;}
@media (max-width:860px){.tools-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.tools-grid{grid-template-columns:1fr;}}

.tool-card{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md);
  padding:22px; display:flex; flex-direction:column; gap:12px; cursor:pointer;
  transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease; position:relative;
}
.tool-card:hover{transform:translateY(-4px); box-shadow:var(--shadow-md); border-color:transparent;}
.tool-card-icon{
  width:44px; height:44px; border-radius:12px; display:flex; align-items:center; justify-content:center;
  font-family:var(--font-mono); font-weight:700; font-size:0.72rem; color:#fff;
}
.icon-word{background:#3B6FE0;} .icon-excel{background:#1F8A5E;} .icon-ppt{background:#D95F3B;}
.icon-jpg{background:#8B5CF6;} .icon-webp{background:#0EA5A5;} .icon-ocr{background:#F2A93B;} .icon-imgconvert{background:#E0507A;}
.tool-card h3{font-size:1.02rem; font-weight:600;}
.tool-card p{font-size:0.86rem;}
.tool-card-badge{
  position:absolute; top:16px; right:16px; font-family:var(--font-mono); font-size:0.62rem;
  background:var(--accent-2); color:#12172B; padding:2px 8px; border-radius:100px; font-weight:700;
}
.tool-card-cta{font-size:0.8rem; font-weight:600; color:var(--accent); display:flex; align-items:center; gap:4px; margin-top:4px;}
.tool-card:hover .tool-card-cta{gap:8px;}

/* ===== How it works ===== */
.steps{display:grid; grid-template-columns:repeat(3,1fr); gap:24px; counter-reset:step;}
@media (max-width:760px){.steps{grid-template-columns:1fr;}}
.step{position:relative; padding:28px 22px; background:var(--surface); border-radius:var(--radius-md); border:1px solid var(--border);}
.step-num{
  font-family:var(--font-mono); font-size:0.78rem; color:var(--accent); font-weight:700; margin-bottom:14px;
  display:inline-block;
}
.step h3{font-size:1.05rem; margin-bottom:8px;}
.step p{font-size:0.9rem;}

/* ===== Features ===== */
.features-grid{display:grid; grid-template-columns:repeat(3,1fr); gap:20px;}
@media (max-width:860px){.features-grid{grid-template-columns:repeat(2,1fr);}}
@media (max-width:560px){.features-grid{grid-template-columns:1fr;}}
.feature{padding:26px 22px; border-radius:var(--radius-md); background:var(--surface); border:1px solid var(--border);}
.feature-icon{width:38px; height:38px; border-radius:10px; background:var(--bg); display:flex; align-items:center; justify-content:center; margin-bottom:14px; font-size:1.1rem;}
.feature h3{font-size:1rem; margin-bottom:6px;}
.feature p{font-size:0.88rem;}

/* ===== Workspace ===== */
#workspace{padding:56px 0 96px;}
.workspace-inner{max-width:720px; margin:0 auto; padding:0 24px;}
.link-back{background:none; border:none; color:var(--ink-soft); font-size:0.88rem; font-weight:600; margin-bottom:24px; padding:0;}
.link-back:hover{color:var(--accent);}
.ws-header{display:flex; align-items:center; gap:16px; margin-bottom:32px;}
.ws-icon{width:52px; height:52px; border-radius:14px; flex-shrink:0;}
.ws-header h2{font-size:1.4rem;}
.ws-header p{font-size:0.92rem; margin-top:4px;}

.dropzone{
  border:2px dashed var(--border); border-radius:var(--radius-lg); background:var(--surface);
  padding:48px 24px; text-align:center; cursor:pointer; transition:border-color .2s, background .2s;
}
.dropzone.dragover{border-color:var(--accent); background:#EEF0FF;}
.dz-icon{
  width:48px; height:48px; margin:0 auto 14px; border-radius:14px; background:var(--bg);
  display:flex; align-items:center; justify-content:center; font-size:1.3rem; color:var(--accent);
}
.dz-title{font-weight:600; color:var(--ink); margin-bottom:16px;}
.dz-hint{font-size:0.78rem; margin-top:14px; color:var(--ink-faint); font-family:var(--font-mono);}

.filelist{display:flex; flex-direction:column; gap:8px; margin-top:20px;}
.filelist-empty{font-size:0.86rem; color:var(--ink-faint); text-align:center;}
.file-chip{
  display:flex; align-items:center; gap:10px; background:var(--surface); border:1px solid var(--border);
  border-radius:var(--radius-sm); padding:10px 14px;
}
.file-chip-name{flex:1; font-size:0.88rem; font-weight:500; overflow:hidden; text-overflow:ellipsis; white-space:nowrap;}
.file-chip-size{font-family:var(--font-mono); font-size:0.75rem; color:var(--ink-faint);}
.file-chip-remove{background:none; border:none; font-size:1.1rem; color:var(--ink-faint);}
.file-chip-remove:hover{color:#D64545;}

.ws-options{margin-top:24px;}
.ws-options h4{font-size:0.85rem; text-transform:uppercase; letter-spacing:0.05em; color:var(--ink-faint); font-family:var(--font-mono); margin-bottom:12px;}
.opt-grid{display:grid; grid-template-columns:repeat(auto-fit, minmax(200px,1fr)); gap:14px;}
.opt-field{display:flex; flex-direction:column; gap:6px; font-size:0.84rem; font-weight:500; color:var(--ink-soft);}
.opt-field input, .opt-field select{
  padding:10px 12px; border-radius:var(--radius-sm); border:1px solid var(--border); font-family:var(--font-body); font-size:0.9rem;
  background:var(--surface); color:var(--ink);
}

.ws-actions{margin-top:28px;}
.ws-progress{margin-top:24px;}
.progress-bar{height:8px; border-radius:100px; background:var(--border); overflow:hidden;}
.progress-fill{height:100%; width:0%; background:linear-gradient(90deg, var(--accent), var(--accent-2)); transition:width .3s ease;}
.ws-progress p{margin-top:10px; font-size:0.84rem; font-family:var(--font-mono);}

.ws-result{margin-top:28px;}
.result-card{
  background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-md); padding:28px; text-align:center;
}
.result-icon{
  width:48px; height:48px; border-radius:50%; background:var(--success); color:#fff; display:flex;
  align-items:center; justify-content:center; margin:0 auto 16px; font-size:1.3rem;
}
.result-btns{display:flex; gap:12px; justify-content:center; margin-top:16px; flex-wrap:wrap;}
.ocr-textarea{
  width:100%; min-height:180px; margin-top:12px; padding:14px; border-radius:var(--radius-sm); border:1px solid var(--border);
  font-family:var(--font-mono); font-size:0.82rem; resize:vertical; background:var(--bg); color:var(--ink);
}

/* ===== Footer ===== */
.footer{padding:48px 0 32px; border-top:1px solid var(--border);}
.footer-inner{display:flex; justify-content:space-between; align-items:flex-start; gap:24px; flex-wrap:wrap;}
.footer p{font-size:0.85rem;}
.footer-disclaimer{max-width:460px; font-size:0.78rem !important; color:var(--ink-faint) !important; margin-top:10px;}
.footer-rights{font-size:0.78rem !important; color:var(--ink-faint) !important;}

/* ===== Toast ===== */
.toast{
  position:fixed; bottom:24px; left:50%; transform:translateX(-50%) translateY(20px);
  background:var(--ink); color:#fff; padding:12px 22px; border-radius:100px; font-size:0.86rem;
  opacity:0; pointer-events:none; transition:opacity .25s ease, transform .25s ease; z-index:100;
}
.toast.show{opacity:1; transform:translateX(-50%) translateY(0);}

@media (max-width:900px){
  .hero-inner{grid-template-columns:1fr; text-align:center;}
  .hero p.subtitle{margin-left:auto; margin-right:auto;}
  .hero-badges{justify-content:center;}
  .hero-visual{margin-top:24px;}
}
.icon-favicon{background:#7C3AED;}