/* Base look shared by every solver page. Tool-specific styles stay in each page. */
:root { color-scheme: dark; --bg: #18181b; --panel: #232327; --fg: #f4f4f5; --muted: #a1a1aa; --line: #3f3f46; --good: #4ade80; --bad: #f87171; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.4 system-ui, -apple-system, sans-serif; -webkit-tap-highlight-color: transparent; }
main { max-width: 460px; margin: 0 auto; padding: 16px 16px 40px; display: flex; flex-direction: column; gap: 14px; }
header { display: flex; align-items: center; gap: 12px; }
header a { color: var(--muted); text-decoration: none; font-size: 14px; }
h1 { margin: 0; font-size: 20px; }
.muted { color: var(--muted); font-size: 14px; }
.big { font-size: 22px; font-weight: 700; }
.row { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.card { background: var(--panel); border-radius: 12px; padding: 14px; display: flex; flex-direction: column; gap: 10px; }
button { font: inherit; color: inherit; background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; cursor: pointer; touch-action: manipulation; }
button:hover:not(:disabled) { border-color: var(--muted); }
button:disabled { opacity: .4; cursor: default; }
button.primary { background: var(--fg); color: var(--bg); border-color: var(--fg); font-weight: 600; }

/* Screenshot drop zone (see screenshot.js). Put it inside a position:relative container. */
.drop { position: absolute; inset: 0; display: grid; place-items: center; text-align: center; padding: 20px; background: rgba(24,24,27,.82); border: 2px dashed var(--line); border-radius: 6px; cursor: pointer; }
body.dragging .drop { border-color: var(--fg); }
.drop[hidden] { display: none; }