:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --border: #e2e5ea;
  --text: #1f2430;
  --muted: #6b7280;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --danger: #dc2626;
  --radius: 10px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.wrap {
  max-width: 640px;
  margin: 0 auto;
  padding: 48px 20px 80px;
}

header.site {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 32px;
}

header.site h1 {
  font-size: 20px;
  margin: 0;
}

header.site a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
}

header.site a:hover { color: var(--text); }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
}

.dropzone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 40px 20px;
  text-align: center;
  color: var(--muted);
  cursor: pointer;
  transition: border-color .15s, background .15s;
}

.dropzone.drag {
  border-color: var(--accent);
  background: #eef3ff;
}

.dropzone strong { color: var(--text); }

#file-input { display: none; }

.file-picked {
  margin-top: 14px;
  font-size: 14px;
  color: var(--text);
}

.field {
  margin-bottom: 16px;
}

.field label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--muted);
}

.field input[type=text],
.field input[type=password],
.field input[type=number],
.field select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: #fff;
  color: var(--text);
}

.row-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

button, .btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 11px 22px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  text-align: center;
}

button:hover, .btn:hover { background: var(--accent-hover); }

button:disabled { background: #a9b6cc; cursor: not-allowed; }

.btn-secondary {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover { background: #f2f3f5; }

.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #b91c1c; }

.result {
  margin-top: 22px;
}

.link-box {
  display: flex;
  gap: 8px;
  margin-top: 8px;
}

.link-box input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13px;
  background: #f9fafb;
}

.notice {
  padding: 12px 14px;
  border-radius: 8px;
  font-size: 14px;
  margin-bottom: 16px;
}

.notice.error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.notice.success { background: #f0fdf4; color: #166534; border: 1px solid #bbf7d0; }
.notice.info { background: #eff6ff; color: #1e40af; border: 1px solid #bfdbfe; }

.meta {
  font-size: 13px;
  color: var(--muted);
  margin-top: 4px;
}

table.admin {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

table.admin th, table.admin td {
  text-align: left;
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
}

table.admin th { color: var(--muted); font-weight: 600; }

.progress {
  height: 6px;
  border-radius: 4px;
  background: var(--border);
  overflow: hidden;
  margin-top: 14px;
  display: none;
}

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--accent);
  transition: width .1s linear;
}

.center-form {
  max-width: 360px;
  margin: 80px auto 0;
}

footer.site {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  margin-top: 40px;
}

.preview { margin-top: 22px; }
.preview-image img { max-width: 100%; height: auto; border: 1px solid var(--border); border-radius: 8px; display: block; }
.preview-video video { width: 100%; max-height: 480px; border-radius: 8px; background: #000; display: block; }
.preview-audio audio { width: 100%; }
.preview-pdf iframe { width: 100%; height: 620px; border: 1px solid var(--border); border-radius: 8px; background: #fff; }
.preview-text pre { max-height: 420px; overflow: auto; background: #f9fafb; border: 1px solid var(--border); border-radius: 8px; padding: 16px; white-space: pre-wrap; word-break: break-word; font-size: 13px; line-height: 1.6; }

/* Dark mode — toggled via body.dark, persisted in localStorage */
body.dark { --bg:#0f172a; --card:#1e293b; --border:#334155; --text:#e2e8f0; --muted:#94a3b8; }
body.dark .dropzone { background:#0f172a; border-color:var(--border); }
body.dark .dropzone.drag { background:#1e3a5f; border-color:var(--accent); }
body.dark .field input[type=text],
body.dark .field input[type=password],
body.dark .field input[type=number],
body.dark .field select,
body.dark .field textarea,
body.dark .link-box input { background:#0f172a; color:var(--text); border-color:var(--border); }
body.dark .notice.info { background:#1e293b; border-color:#334155; color:#93c5fd; }
body.dark .notice.success { background:#052e16; border-color:#14532d; color:#86efac; }
body.dark .notice.error { background:#450a0a; border-color:#7f1d1d; color:#fca5a5; }
body.dark .btn-secondary { background:#1e293b; color:var(--text); border-color:var(--border); }
body.dark .btn-secondary:hover { background:#334155; color:var(--text); }
body.dark .link-box input { background:#0f172a; color:var(--text); }
body.dark table.admin th { color:var(--muted); border-color:var(--border); }
body.dark table.admin td { border-color:var(--border); }
body.dark .admin-nav { background:var(--card); border-color:var(--border); }
body.dark .admin-nav button,.dark .admin-nav a { color:var(--muted); }
body.dark .admin-nav button.active,.dark .admin-nav a.active { background:var(--accent); color:#fff; }

/* Expiry badge */
.badge-warn { background:#fef3c7; color:#92400e; border:1px solid #fcd34d; padding:2px 6px; border-radius:999px; font-size:11px; font-weight:600; }
body.dark .badge-warn { background:#451a03; color:#fcd34d; border-color:#92400e; }

/* Thumbnail in admin table */
.admin-thumb { width:40px; height:40px; object-fit:cover; border-radius:6px; border:1px solid var(--border); vertical-align:middle; }

/* Admin navbar */
.admin-nav { display:flex; gap:6px; flex-wrap:wrap; margin-bottom:20px; padding:8px; background:var(--card); border:1px solid var(--border); border-radius:8px; }
.admin-nav button { padding:8px 14px; font-size:13px; border-radius:6px; border:1px solid var(--border); background:var(--card); color:var(--muted); cursor:pointer; font-weight:500; }
.admin-nav button.active { background:var(--accent); color:#fff; border-color:var(--accent); }
.admin-nav button:hover:not(.active) { background:var(--bg); }
.admin-section { display:none; }
.admin-section.active { display:block; }
.site-nav { display:flex; gap:12px; align-items:center; flex-wrap:wrap; margin-bottom:20px; padding:10px 14px; background:var(--card); border:1px solid var(--border); border-radius:8px; }
.site-nav a { color:var(--muted); text-decoration:none; font-size:13px; font-weight:500; padding:6px 10px; border-radius:6px; }
.site-nav a.active, .site-nav a:hover { color:var(--accent); background:var(--bg); }
body.dark .site-nav { background:var(--card); border-color:var(--border); }