:root {
  --bg: #f6f7fb; --panel: #fff; --ink: #1c2230; --muted: #6b7280;
  --brand: #4f46e5; --brand-ink: #fff; --line: #e5e7eb; --danger: #dc2626;
}
* { box-sizing: border-box; }
body { margin: 0; font: 15px/1.5 -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--ink); background: var(--bg); }
a { color: var(--brand); text-decoration: none; }
a:hover { text-decoration: underline; }
main { max-width: 960px; margin: 0 auto; padding: 24px 16px; }

.topbar { display: flex; align-items: center; justify-content: space-between;
  padding: 12px 20px; background: var(--panel); border-bottom: 1px solid var(--line); }
.brand { font-weight: 700; font-size: 18px; }
.topbar nav { display: flex; align-items: center; gap: 14px; }
.who { color: var(--muted); }

.btn { background: var(--brand); color: var(--brand-ink); border: 0;
  padding: 9px 16px; border-radius: 8px; cursor: pointer; font-size: 14px; }
.btn:hover { filter: brightness(1.05); text-decoration: none; }
.btn-ghost { background: transparent; border: 1px solid var(--line);
  padding: 8px 14px; border-radius: 8px; cursor: pointer; color: var(--ink); }
.btn-ghost.danger { color: var(--danger); border-color: #f3c7c7; }

.hero { text-align: center; padding: 40px 0; }
.hero h1 { font-size: 40px; margin: 0 0 10px; }
.hero p { color: var(--muted); font-size: 18px; max-width: 560px; margin: 0 auto 22px; }
.cta { display: flex; gap: 12px; justify-content: center; }
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 30px; }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 18px; }
.card h3 { margin: 0 0 6px; }

.auth { max-width: 380px; margin: 30px auto; background: var(--panel);
  border: 1px solid var(--line); border-radius: 12px; padding: 24px; }
.auth label { display: block; margin-bottom: 14px; font-size: 13px; color: var(--muted); }
.auth input, .tool input, .row-actions input { width: 100%; padding: 9px 11px; margin-top: 5px;
  border: 1px solid var(--line); border-radius: 8px; font-size: 14px; }
.auth .btn { width: 100%; }

.flash { background: #eef2ff; border: 1px solid #c7d2fe; color: #3730a3;
  padding: 10px 14px; border-radius: 8px; margin-bottom: 18px; word-break: break-all; }
.muted { color: var(--muted); }
.small { font-size: 12px; }

.toolbar { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-bottom: 28px; }
.tool { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 16px; }
.tool h3 { margin: 0 0 10px; font-size: 15px; }
.tool input { margin-bottom: 10px; }

.grid { width: 100%; border-collapse: collapse; background: var(--panel);
  border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.grid th, .grid td { text-align: left; padding: 11px 14px; border-bottom: 1px solid var(--line);
  vertical-align: top; }
.grid th { background: #fafafa; font-size: 12px; color: var(--muted); text-transform: uppercase; }
.row-actions { display: flex; gap: 8px; align-items: flex-start; }
.row-actions form { display: flex; gap: 6px; }
.row-actions input { width: 150px; margin: 0; }

.viewer { background: var(--panel); border: 1px solid var(--line); border-radius: 12px; padding: 20px; }
.preview-frame { width: 100%; height: 460px; border: 1px solid var(--line);
  border-radius: 8px; background: #fff; }

body.embed { background: #fff; padding: 16px; }
.filetext { white-space: pre-wrap; word-break: break-word; font: 13px/1.5 ui-monospace, Menlo, monospace; }
.embed img { max-width: 100%; }
.caption { margin-top: 12px; color: var(--muted); }

.foot { text-align: center; color: var(--muted); padding: 30px; font-size: 13px; }
@media (max-width: 720px) { .cards, .toolbar { grid-template-columns: 1fr; } }