/* ========== Base ========== */
:root{
  --brand:#1f6fff;      /* primary brand */
  --ink:#0f172a;        /* heading text */
  --muted:#6b7280;      /* subdued text */
  --bg:#f6f8fb;         /* page background */
  --card:#ffffff;       /* card/nav bg */
  --accent:#00c2ff;     /* highlight */
}

* { box-sizing: border-box; }

body {
  font-family: system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
}

/* Remove the old blue bar header (conflicted with premium header) */
/* header { ... }  <-- deleted on purpose */

/* ========== Premium Header (used by your HTML) ========== */
.site-header{
  position: sticky; top: 0; z-index: 60;
  backdrop-filter: saturate(180%) blur(8px);
  background: linear-gradient(180deg, rgba(255,255,255,.92), rgba(255,255,255,.80));
  border-bottom: 1px solid rgba(15,23,42,.06);
}
.nav-wrap{
  max-width: 1100px; margin: 0 auto;
  padding: 12px 16px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
}
.brand{
  display: flex; align-items: center; gap: 10px;
  text-decoration: none;
}
.brand span{
  font-size: 1.25rem; font-weight: 800; color: var(--ink);
  letter-spacing: .2px;
}
.brand .accent{ color: var(--brand); }

/* Simple header nav (matches your current HTML structure) */
.site-header nav a{
  color: var(--ink);
  text-decoration: none;
  margin-left: 16px;
  font-weight: 600;
}
.site-header nav a:hover{ color: var(--brand); }

/* ========== Optional Advanced Nav (currently unused) ========== */
.site-nav ul{
  display:flex; align-items:center; gap:18px;
  list-style:none; margin:0; padding:0;
}
.site-nav a{
  text-decoration:none; color:var(--ink);
  font-weight:600; font-size:.98rem; position:relative; padding:6px 2px;
}
.site-nav a:hover{ color:var(--brand); }
.site-nav a::after{
  content:""; position:absolute; left:0; right:0; bottom:-2px; height:2px;
  background:linear-gradient(90deg, var(--brand), var(--accent));
  transform:scaleX(0); transform-origin:left; transition:transform .22s ease;
}
.site-nav a:hover::after{ transform:scaleX(1); }
.site-nav a.active{ color:var(--brand); }

/* CTA button (works for either nav pattern) */
.site-nav .btn-cta,
.site-header nav .btn-cta{
  color:#fff !important; background:linear-gradient(90deg, var(--brand), var(--accent));
  padding:9px 14px; border-radius:10px; box-shadow:0 6px 18px rgba(31,111,255,.22);
}
.site-nav .btn-cta::after{ display:none; }
.site-nav .btn-cta:hover,
.site-header nav .btn-cta:hover{
  filter:saturate(1.1) brightness(1.02);
}

/* Mobile toggle (only if you later add hamburger) */
.menu-toggle{
  display:none;
  width:42px; height:42px; border:1px solid rgba(15,23,42,.1);
  border-radius:10px; background:#fff; cursor:pointer;
  align-items:center; justify-content:center; gap:5px; flex-direction:column;
}
.menu-toggle span{
  display:block; width:20px; height:2px; background:var(--ink);
}

/* Responsive header behavior */
@media (max-width: 880px){
  .menu-toggle{ display:flex; }
  /* If using .site-nav */
  .site-nav{
    position:absolute; top:100%; left:0; right:0;
    background:var(--card);
    border-bottom:1px solid rgba(15,23,42,.06);
    transform:translateY(-6px); opacity:0; pointer-events:none;
    transition:opacity .18s ease, transform .18s ease;
  }
  .site-nav.open{ transform:translateY(0); opacity:1; pointer-events:auto; }
  .site-nav ul{
    flex-direction:column; align-items:flex-start; gap:8px;
    max-width:1100px; margin:0 auto; padding:12px 16px 16px;
  }

  /* If sticking with your simple <nav>, stack links on small screens */
  .site-header .nav-wrap{ flex-direction: column; align-items: flex-start; gap: 8px; }
  .site-header nav a{ margin: 0 12px 6px 0; display:inline-block; }
}

/* ========== Cards / Sections used on pages ========== */
main{ max-width: 900px; margin: 34px auto; padding: 0 16px; }
.card{
  background: var(--card); border-radius: 16px;
  box-shadow: 0 8px 28px rgba(0,0,0,.06);
  padding: 24px;
}
.hero{ text-align:center; margin-bottom:14px; }
.hero h1{ margin:0 0 6px; font-size:1.7rem; }
.hero p{ margin:0; color: var(--muted); }

/* ========== Uploader / Controls / Output (homepage) ========== */
.uploader{
  border:2px dashed rgba(15,23,42,.12);
  border-radius:14px;
  padding:22px;
  background:#fafbff;
  display:flex; flex-direction:column; align-items:center; gap:12px;
  text-align:center;
}
.uploader input[type=file]{ display:none; }

.controls{ display:flex; align-items:center; gap:12px; flex-wrap:wrap; justify-content:center; }

.btn{
  appearance:none; border:0; border-radius:12px; cursor:pointer;
  background:linear-gradient(90deg,#1f6fff,#00c2ff);
  color:#fff; padding:12px 18px; font-weight:700;
  box-shadow:0 10px 22px rgba(31,111,255,.22);
}
.btn.secondary{ background:#eef2ff; color:#1f3a8a; box-shadow:none; }

.quality-label{ font-weight:700; }
.quality-value{ min-width:42px; text-align:right; font-weight:700; }

.quality-range{
  -webkit-appearance:none; appearance:none;
  width:240px; height:8px; border-radius:999px;
  background:linear-gradient(90deg,#1f6fff,#00c2ff);
  outline:none; opacity:.95; transition:opacity .2s ease;
}
.quality-range:hover{ opacity:1; }
.quality-range::-webkit-slider-thumb{
  -webkit-appearance:none; appearance:none;
  width:20px; height:20px; border-radius:50%;
  background:#fff; border:2px solid #1f6fff;
  box-shadow:0 1px 6px rgba(0,0,0,.18); cursor:pointer;
}
.quality-range::-moz-range-thumb{
  width:20px; height:20px; border:none; border-radius:50%;
  background:#fff; box-shadow:0 1px 6px rgba(0,0,0,.18); cursor:pointer;
}

.output{
  margin-top:18px;
  display:grid; gap:16px;
  grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
}
.thumb{
  background:#fff; border:1px solid rgba(15,23,42,.08);
  border-radius:12px; padding:12px; text-align:center;
}
.thumb img{
  max-width:100%;
  border-radius:8px; border:1px solid rgba(15,23,42,.06);
}
.meta{ font-size:.85rem; color:#6b7280; margin:8px 0; }

/* ========== Legacy blocks kept (won't hurt) ========== */
.upload-container {
  max-width: 600px;
  margin: 30px auto;
  text-align: center;
  background: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}
.upload-label {
  display: inline-block;
  padding: 10px 20px;
  background: #4A90E2;
  color: white;
  cursor: pointer;
  border-radius: 5px;
}
#compressBtn {
  padding: 10px 20px;
  margin-top: 10px;
  background: #2ECC71;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}
#output img { max-width: 100px; margin: 10px; }

/* Footer */
footer {
  text-align: center;
  padding: 20px;
  font-size: 14px;
  color: var(--muted);
}