/* =========================================================
   AI Image Upscaler — design tokens
   Ink navy background, signal teal + amber accents
   Display: Space Grotesk / Body: Inter / Data: IBM Plex Mono
   ========================================================= */

:root{
  --ink-900:#0b1018;
  --ink-800:#0e1420;
  --ink-700:#141c2b;
  --ink-600:#1c2740;
  --line:#263148;
  --paper:#f6f5f1;
  --paper-dim:#c9cddb;
  --slate:#8a93a6;
  --teal:#2fd9c4;
  --teal-dim:#1d9c8c;
  --amber:#f5a623;
  --danger:#e85c5c;
  --radius:14px;
  --radius-sm:8px;
  --shadow:0 20px 60px -20px rgba(0,0,0,.6);
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--ink-900);
  color:var(--paper);
  font-family:'Inter',system-ui,-apple-system,sans-serif;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{
  font-family:'Space Grotesk',system-ui,sans-serif;
  font-weight:600;
  line-height:1.15;
  margin:0 0 .5em;
  letter-spacing:-0.01em;
}
p{margin:0 0 1em;color:var(--paper-dim);}
a{color:var(--teal);text-decoration:none;}
a:hover{text-decoration:underline;}
.mono{font-family:'IBM Plex Mono',monospace;}
img{max-width:100%;display:block;}

/* ---------- layout helpers ---------- */
.wrap{max-width:1120px;margin:0 auto;padding:0 24px;}
.section{padding:88px 0;}
.section-tight{padding:56px 0;}
.center{text-align:center;}
.eyebrow{
  font-family:'IBM Plex Mono',monospace;
  font-size:.75rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--teal);
  margin-bottom:.75em;
  display:inline-block;
}

/* ---------- pixel-resolve motif (signature element) ---------- */
.resolve-divider{
  display:flex;
  align-items:center;
  gap:2px;
  height:18px;
  margin:0 auto 40px;
  width:fit-content;
}
.resolve-divider span{
  width:6px;height:6px;background:var(--line);
  animation:none;
}
.resolve-divider span:nth-child(1){opacity:.25; width:14px;height:14px;}
.resolve-divider span:nth-child(2){opacity:.4; width:12px;height:12px;}
.resolve-divider span:nth-child(3){opacity:.6; width:10px;height:10px;background:var(--teal-dim);}
.resolve-divider span:nth-child(4){opacity:.8; width:8px;height:8px;background:var(--teal);}
.resolve-divider span:nth-child(5){width:6px;height:6px;background:var(--teal);box-shadow:0 0 8px var(--teal);}

.pixel-bg{
  position:absolute; inset:0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:34px 34px;
  opacity:.18;
  mask-image:radial-gradient(ellipse 60% 50% at 50% 20%, black 40%, transparent 90%);
  pointer-events:none;
}

/* ---------- header ---------- */
header{
  position:sticky; top:0; z-index:50;
  background:rgba(11,16,24,.85);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  padding:16px 24px; max-width:1120px; margin:0 auto;
}
.logo{
  font-family:'Space Grotesk',sans-serif; font-weight:700; font-size:1.15rem;
  color:var(--paper); display:flex; align-items:center; gap:8px;
}
.logo .dot{width:8px;height:8px;background:var(--teal);border-radius:1px;box-shadow:0 0 10px var(--teal);}
.nav-links{display:flex; gap:28px; align-items:center;}
.nav-links a{color:var(--paper-dim); font-size:.92rem;}
.nav-links a:hover{color:var(--paper); text-decoration:none;}
.nav-cta{
  background:var(--teal); color:var(--ink-900)!important; padding:9px 18px;
  border-radius:999px; font-weight:600; font-size:.88rem!important;
}
.nav-cta:hover{background:var(--amber); text-decoration:none!important;}
.burger{display:none;}

/* ---------- hero ---------- */
.hero{position:relative; overflow:hidden; padding:72px 0 40px;}
.hero-inner{position:relative; z-index:2; text-align:center; max-width:760px; margin:0 auto;}
.hero h1{font-size:clamp(2.1rem,5vw,3.4rem);}
.hero h1 .accent{color:var(--teal);}
.hero .lede{font-size:1.1rem; max-width:600px; margin:0 auto 8px;}
.trust-row{
  display:flex; gap:22px; justify-content:center; flex-wrap:wrap;
  margin-top:22px; font-family:'IBM Plex Mono',monospace; font-size:.78rem;
  color:var(--slate);
}
.trust-row span{display:flex; align-items:center; gap:6px;}
.trust-row .tick{color:var(--teal);}

/* ---------- tool card ---------- */
.tool-card{
  max-width:880px; margin:44px auto 0; background:var(--ink-800);
  border:1px solid var(--line); border-radius:var(--radius);
  box-shadow:var(--shadow); overflow:hidden; position:relative; z-index:2;
}
.tool-body{padding:32px;}
.dropzone{
  border:2px dashed var(--line); border-radius:var(--radius-sm);
  padding:48px 24px; text-align:center; cursor:pointer;
  transition:border-color .2s, background .2s;
}
.dropzone.drag{border-color:var(--teal); background:rgba(47,217,196,.05);}
.dropzone svg{margin-bottom:14px;}
.dropzone .dz-title{font-family:'Space Grotesk',sans-serif; font-weight:600; font-size:1.05rem; color:var(--paper);}
.dropzone .dz-sub{font-size:.85rem; color:var(--slate); margin-top:6px;}
.dropzone input[type=file]{display:none;}

.controls{display:none; }
.controls.active{display:block;}
.stage{display:none;}
.stage.active{display:block;}

.preview-row{display:flex; gap:20px; align-items:flex-start; flex-wrap:wrap; margin-bottom:24px;}
.preview-thumb{
  width:120px; height:120px; border-radius:var(--radius-sm); overflow:hidden;
  border:1px solid var(--line); flex-shrink:0; background:var(--ink-700);
}
.preview-thumb img{width:100%; height:100%; object-fit:cover;}
.file-meta{flex:1; min-width:200px;}
.file-meta .fname{font-weight:600; color:var(--paper); word-break:break-all;}
.file-meta .fdim{font-family:'IBM Plex Mono',monospace; font-size:.82rem; color:var(--teal); margin-top:6px;}
.file-meta .fsize{font-size:.82rem; color:var(--slate);}
.change-btn{
  background:none; border:1px solid var(--line); color:var(--paper-dim);
  padding:7px 14px; border-radius:999px; font-size:.8rem; cursor:pointer; margin-top:10px;
}
.change-btn:hover{border-color:var(--teal); color:var(--teal);}

.option-group{margin-bottom:22px;}
.option-label{
  font-family:'IBM Plex Mono',monospace; font-size:.75rem; letter-spacing:.08em;
  text-transform:uppercase; color:var(--slate); margin-bottom:10px; display:block;
}
.pill-row{display:flex; gap:10px; flex-wrap:wrap;}
.pill{
  border:1px solid var(--line); background:var(--ink-700); color:var(--paper-dim);
  padding:12px 18px; border-radius:var(--radius-sm); cursor:pointer;
  font-family:'IBM Plex Mono',monospace; font-size:.9rem; font-weight:600;
  transition:all .15s; text-align:left; min-width:110px;
}
.pill small{display:block; font-family:'Inter',sans-serif; font-weight:400; font-size:.72rem; color:var(--slate); margin-top:3px;}
.pill:hover{border-color:var(--teal-dim);}
.pill.selected{border-color:var(--teal); background:rgba(47,217,196,.08); color:var(--teal);}
.pill.selected small{color:var(--teal-dim);}

.run-btn{
  width:100%; background:var(--teal); color:var(--ink-900); border:none;
  padding:16px; border-radius:var(--radius-sm); font-family:'Space Grotesk',sans-serif;
  font-weight:700; font-size:1.02rem; cursor:pointer; transition:background .15s, transform .1s;
}
.run-btn:hover{background:#4fe6d2;}
.run-btn:active{transform:scale(.99);}
.run-btn:disabled{background:var(--ink-600); color:var(--slate); cursor:not-allowed;}

.progress-wrap{padding:6px 0 2px;}
.progress-label{
  font-family:'IBM Plex Mono',monospace; font-size:.82rem; color:var(--teal);
  display:flex; justify-content:space-between; margin-bottom:10px;
}
.progress-track{height:6px; background:var(--ink-600); border-radius:4px; overflow:hidden;}
.progress-fill{height:100%; width:4%; background:linear-gradient(90deg,var(--teal-dim),var(--teal)); transition:width .2s;}
.progress-note{font-size:.8rem; color:var(--slate); margin-top:12px;}

/* result / compare slider */
.result-wrap{}
.compare{
  position:relative; width:100%; border-radius:var(--radius-sm); overflow:hidden;
  border:1px solid var(--line); background:var(--ink-700); user-select:none;
  aspect-ratio:4/3;
}
.compare img{position:absolute; inset:0; width:100%; height:100%; object-fit:contain; background:var(--ink-900);}
.compare .after-wrap{position:absolute; inset:0; overflow:hidden; width:100%; height:100%; clip-path:inset(0 50% 0 0);}
.compare .after-wrap img{position:absolute; inset:0; width:100%; height:100%; object-fit:contain; background:var(--ink-900);}
.compare .handle{
  position:absolute; top:0; bottom:0; left:50%; width:2px; background:var(--teal);
  cursor:ew-resize; box-shadow:0 0 10px rgba(47,217,196,.6);
}
.compare .handle::after{
  content:'⇔'; position:absolute; top:50%; left:50%; transform:translate(-50%,-50%);
  width:38px; height:38px; background:var(--teal); color:var(--ink-900); border-radius:50%;
  display:flex; align-items:center; justify-content:center; font-size:1rem; font-weight:700;
}
.compare-tag{
  position:absolute; top:10px; font-family:'IBM Plex Mono',monospace; font-size:.72rem;
  background:rgba(11,16,24,.7); padding:4px 10px; border-radius:999px; letter-spacing:.05em;
  z-index:3; pointer-events:none;
}
.compare-tag.before{left:10px;}
.compare-tag.after{right:10px;}

.result-actions{display:flex; gap:12px; margin-top:22px; flex-wrap:wrap;}
.download-btn{
  flex:1; min-width:180px; background:var(--amber); color:var(--ink-900); border:none;
  padding:15px; border-radius:var(--radius-sm); font-family:'Space Grotesk',sans-serif;
  font-weight:700; cursor:pointer; text-align:center;
}
.download-btn:hover{background:#ffbb47;}
.reset-btn{
  background:none; border:1px solid var(--line); color:var(--paper-dim);
  padding:15px 22px; border-radius:var(--radius-sm); cursor:pointer; font-weight:600;
}
.reset-btn:hover{border-color:var(--teal); color:var(--teal);}
.format-inline{display:flex; align-items:center; gap:10px; margin-top:16px; font-size:.85rem; color:var(--slate);}
.format-inline select{
  background:var(--ink-700); color:var(--paper); border:1px solid var(--line);
  border-radius:6px; padding:6px 10px; font-family:'IBM Plex Mono',monospace;
}
.error-box{
  background:rgba(232,92,92,.08); border:1px solid var(--danger); color:#ffb9b9;
  padding:14px 16px; border-radius:var(--radius-sm); font-size:.88rem; margin-top:16px;
}

/* ---------- how it works ---------- */
.steps{display:grid; grid-template-columns:repeat(3,1fr); gap:28px; margin-top:44px;}
.step{background:var(--ink-800); border:1px solid var(--line); border-radius:var(--radius); padding:28px;}
.step .n{font-family:'IBM Plex Mono',monospace; color:var(--teal); font-size:.8rem; margin-bottom:10px;}
.step h3{font-size:1.05rem;}
.step p{font-size:.92rem; margin:0;}

/* ---------- features ---------- */
.features{display:grid; grid-template-columns:repeat(3,1fr); gap:24px; margin-top:44px;}
.feature{padding:4px;}
.feature .icon{color:var(--teal); margin-bottom:14px;}
.feature h3{font-size:1rem;}
.feature p{font-size:.9rem;}

/* ---------- faq ---------- */
.faq{max-width:760px; margin:44px auto 0;}
.faq-item{border-bottom:1px solid var(--line); padding:20px 0;}
.faq-item summary{
  cursor:pointer; font-family:'Space Grotesk',sans-serif; font-weight:600; color:var(--paper);
  list-style:none; display:flex; justify-content:space-between; align-items:center; gap:16px;
}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:'+'; color:var(--teal); font-size:1.3rem; flex-shrink:0;}
.faq-item[open] summary::after{content:'−';}
.faq-item p{margin-top:12px; font-size:.92rem;}

/* ---------- ad slots ---------- */
.ad-slot{margin:0 auto; text-align:center; max-width:1120px; padding:0 24px;}
.ad-slot ins{display:block; min-height:0;}
.ad-label{font-family:'IBM Plex Mono',monospace; font-size:.65rem; color:var(--slate); letter-spacing:.1em; text-transform:uppercase; margin-bottom:8px;}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--line); padding:48px 0 32px; margin-top:20px;}
.footer-grid{display:flex; justify-content:space-between; flex-wrap:wrap; gap:32px;}
.footer-brand p{max-width:280px; font-size:.85rem;}
.footer-cols{display:flex; gap:56px; flex-wrap:wrap;}
.footer-col h4{font-size:.8rem; text-transform:uppercase; letter-spacing:.08em; color:var(--slate); font-family:'IBM Plex Mono',monospace; font-weight:500;}
.footer-col a{display:block; color:var(--paper-dim); font-size:.88rem; margin-bottom:10px;}
.footer-col a:hover{color:var(--teal); text-decoration:none;}
.footer-bottom{
  margin-top:40px; padding-top:24px; border-top:1px solid var(--line);
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:12px;
  font-size:.78rem; color:var(--slate);
}

/* ---------- simple pages ---------- */
.page-hero{padding:64px 0 20px; text-align:center;}
.page-hero h1{font-size:clamp(1.8rem,4vw,2.6rem);}
.prose{max-width:760px; margin:0 auto; padding-bottom:60px;}
.prose h2{margin-top:2em; font-size:1.3rem;}
.prose ul{color:var(--paper-dim); padding-left:1.2em;}
.prose li{margin-bottom:.5em;}
.contact-card{
  max-width:520px; margin:0 auto; background:var(--ink-800); border:1px solid var(--line);
  border-radius:var(--radius); padding:32px; text-align:center;
}

/* ---------- focus & motion ---------- */
a:focus-visible, button:focus-visible, .pill:focus-visible, .dropzone:focus-visible{
  outline:2px solid var(--teal); outline-offset:2px;
}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:.01ms!important; transition-duration:.01ms!important;}
}

/* ---------- responsive ---------- */
@media (max-width:760px){
  .nav-links{position:fixed; top:64px; left:0; right:0; background:var(--ink-800);
    flex-direction:column; padding:20px 24px; border-bottom:1px solid var(--line);
    display:none; gap:16px;}
  .nav-links.open{display:flex;}
  .burger{display:block; background:none; border:none; color:var(--paper); font-size:1.4rem; cursor:pointer;}
  .steps, .features{grid-template-columns:1fr;}
  .footer-grid{flex-direction:column;}
  .tool-body{padding:22px;}
  .pill-row{gap:8px;}
  .pill{min-width:100px; padding:10px 14px;}
}