/* Light-first design tokens, with dark mode via [data-theme="dark"] and OS preference */
:root{
  /* LIGHT */
  --bg: #f7f9fc;
  --card: #ffffff;
  --elev: #ffffff;
  --text: #0e1320;
  --muted: #5b6574;
  --border: #e5e9f0;
  --accent: #2563eb;   /* blue-600 */
  --accent-2: #7c3aed; /* violet-600 */
  --ok: #16a34a;
  --warn: #ca8a04;
  --err: #dc2626;

  --r: 14px;
  --shadow: 0 6px 24px rgba(10, 20, 40, .08);
  --sp: 12px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
}

[data-theme="dark"], @media (prefers-color-scheme: dark) {
  :root {
    /* DARK */
    --bg: #0b0d10;
    --card: #12151a;
    --elev: #161a20;
    --text: #E9EEF4;
    --muted: #8d98a7;
    --border: #e5e9f00d; /* translucent for subtle borders on dark */
    --accent: #3A86FF;
    --accent-2: #9B5CF6;
    --ok: #16a34a;
    --warn: #eab308;
    --err: #ef4444;
    --shadow: 0 10px 30px rgba(0,0,0,.35);
  }
}
/* in assets/css/modern.css */
#uploadBtn {
  background-color: blue;
  color: white;
  padding: 0.5rem 1.1rem;
  font-family: sans-serif;
  border-radius: 0.3rem;
  cursor: pointer;
  border: none;
  margin-top: 1rem;
}
#uploadBtn:hover {
  filter: brightness(1.1);
}

* { box-sizing: border-box }
html,body { height: 100% }
body{
  margin:0;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 var(--font);
}

a { color: var(--accent); text-decoration: none }
a:hover { text-decoration: underline }
img{ max-width:100%; display:block }

.container{ width:min(1100px, 100% - 32px); margin-inline:auto }

.topbar{
  position:sticky; top:0; z-index:50;
  backdrop-filter: saturate(120%) blur(8px);
  background: color-mix(in oklab, var(--bg) 85%, #fff 15%);
  border-bottom: 1px solid var(--border);
}
.topbar .wrap{
  display:flex; align-items:center; justify-content:space-between; gap:12px;
  padding:10px 0;
}

.brand{ display:flex; align-items:center; gap:10px; color:var(--text); text-decoration:none }
.brand img{ width:28px; height:28px; border-radius:8px; box-shadow:0 0 0 1px var(--border) inset }
.nav{ display:flex; gap:8px; flex-wrap:wrap }

.card{
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r);
  box-shadow: var(--shadow);
}

.btn{
  appearance:none; border:1px solid var(--border); background: var(--elev);
  color: var(--text); padding: 9px 12px; border-radius: 10px; cursor:pointer;
}
.btn:hover{ filter: brightness(1.04) }
.btn.primary{ background: linear-gradient(135deg, var(--accent), var(--accent-2)); border:0; color:#fff }
.btn.ghost{ background: transparent }
.btn.bad{ background: #fee2e2; border-color:#fecaca; color:#7f1d1d }

.input{
  width:100%; padding:10px 12px; border-radius:10px;
  background:#fff; border:1px solid var(--border); color:var(--text)
}
[data-theme="dark"] .input { background:#0f1318; }

.grid{ display:grid; gap:12px }
.cols-2{ grid-template-columns: repeat(2, minmax(0,1fr)) }
@media (max-width: 760px){ .cols-2{ grid-template-columns: 1fr } }

.footer{
  margin-top:28px; border-top:1px solid var(--border);
  background: color-mix(in oklab, var(--bg) 96%, #fff 4%);
}

/* Masonry-ish gallery */
.masonry{ column-count: 4; column-gap: 12px }
@media (max-width: 1100px){ .masonry{ column-count: 3 } }
@media (max-width: 760px){ .masonry{ column-count: 2 } }
@media (max-width: 520px){ .masonry{ column-count: 1 } }
.masonry .tile{ break-inside: avoid; margin-bottom: 12px }
.masonry .tile a{ display:block; border:1px solid var(--border); border-radius: 12px; overflow:hidden; background:#fff }
[data-theme="dark"] .masonry .tile a{ background:#0f1216 }

/* Dropzone */
.drop{
  border:1px dashed var(--border); border-radius: 14px; padding: 18px; text-align:center;
  background: #fff;
}
.drop.hl{ background: color-mix(in oklab, var(--accent) 6%, #fff) }
[data-theme="dark"] .drop { background:#0e1116 }

/* Toaster */
#toaster{ position:fixed; right:16px; bottom:16px; display:grid; gap:8px; z-index:9999 }
.toast{
  background: var(--card); border:1px solid var(--border); border-radius:10px;
  padding:10px 12px; box-shadow: var(--shadow);
}
.toast.err{ background:#fee2e2; border-color:#fecaca; color:#7f1d1d }
[data-theme="dark"] .toast.err { background: color-mix(in oklab, var(--err) 15%, var(--elev)); border-color:#5a2020; color:#fff }