:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #14171f;
  --muted: #626a7a;
  --line: #e4e7ee;
  --panel: #f7f8fb;
  --accent: #2f5bd7;
  --accent-fg: #ffffff;
  --gold: #9a7615;
  --gold-bg: #fdf6e3;
  --bad: #b3261e;
  --radius: 12px;
  --shadow: 0 1px 2px rgb(20 23 31 / 6%), 0 8px 24px rgb(20 23 31 / 6%);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12141a;
    --fg: #e9ecf2;
    --muted: #9aa3b4;
    --line: #272b35;
    --panel: #1a1d25;
    --accent: #6d92ef;
    --accent-fg: #10131a;
    --gold: #e2bc5c;
    --gold-bg: #2a2415;
    --bad: #f0857c;
    --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 8px 24px rgb(0 0 0 / 25%);
  }
}

* { box-sizing: border-box; }

/* The header is sticky, so anchor jumps and scrollIntoView must clear it. */
html { scroll-padding-top: 76px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* Header */
.top { border-bottom: 1px solid var(--line); position: sticky; top: 0; background: var(--bg); z-index: 10; }
.top .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-weight: 700; font-size: 17px; color: var(--fg); text-decoration: none; letter-spacing: -0.01em; }
.top nav a { color: var(--muted); text-decoration: none; margin-left: 22px; font-size: 14px; }
.top nav a:hover { color: var(--fg); }

/* Hero */
.hero { padding: 64px 0 36px; max-width: 660px; }
.hero h1 { font-size: clamp(30px, 5vw, 44px); line-height: 1.15; letter-spacing: -0.02em; margin: 0 0 16px; }
.lede { font-size: 18px; color: var(--muted); margin: 0; }

/* Drop zone */
.drop {
  border: 2px dashed var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  padding: 52px 24px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.drop:hover, .drop:focus-visible, .drop.over { border-color: var(--accent); background: var(--bg); outline: none; }
.drop.over { border-style: solid; }
.drop-icon { width: 34px; height: 34px; color: var(--muted); margin-bottom: 10px; }
.drop-title { font-weight: 600; margin: 0 0 4px; }
.drop-hint { color: var(--muted); font-size: 14px; margin: 0; }

.error {
  margin: 16px 0 0; padding: 12px 14px; border-radius: 8px;
  background: color-mix(in srgb, var(--bad) 10%, transparent);
  color: var(--bad); font-size: 14px;
  border: 1px solid color-mix(in srgb, var(--bad) 30%, transparent);
}

/* Controls */
.controls { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; margin: 32px 0 16px; flex-wrap: wrap; }
.field label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; }
.field select {
  font: inherit; font-size: 15px; padding: 9px 12px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--bg); color: var(--fg); min-width: 220px;
}
.field-hint { font-size: 13px; color: var(--muted); margin: 6px 0 0; }

/* Result panes */
.panes { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 18px; }
.pane { margin: 0; }
.pane figcaption { display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-bottom: 8px; }
.pane-title { font-weight: 600; font-size: 14px; }

.badge {
  font-size: 11px; font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--muted); border: 1px solid var(--line); border-radius: 99px; padding: 2px 8px;
}
.badge.ok { color: #2f7a4c; border-color: color-mix(in srgb, #2f7a4c 40%, transparent); }
.badge.bad { color: var(--bad); border-color: color-mix(in srgb, var(--bad) 40%, transparent); }
.badge.gold { color: var(--gold); border-color: color-mix(in srgb, var(--gold) 45%, transparent); }

.stage {
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel);
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  padding: 14px; overflow: hidden; position: relative;
}
.stage img { max-width: 100%; max-height: 100%; object-fit: contain; }

.checker {
  background-image:
    linear-gradient(45deg, var(--line) 25%, transparent 25%),
    linear-gradient(-45deg, var(--line) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--line) 75%),
    linear-gradient(-45deg, transparent 75%, var(--line) 75%);
  background-size: 18px 18px;
  background-position: 0 0, 0 9px, 9px -9px, -9px 0;
}

.pane-actions { margin-top: 10px; display: flex; gap: 8px; }

/* Upsell */
.upsell { text-align: center; padding: 20px; background: var(--bg); border-radius: 10px; max-width: 280px; }
.upsell p { margin: 0 0 8px; font-size: 14px; }
.upsell-body { color: var(--muted); }
.upsell-note { color: var(--muted); font-size: 12px; margin: 10px 0 0; }

.spinner { text-align: center; color: var(--muted); font-size: 14px; }
.ring {
  width: 30px; height: 30px; margin: 0 auto 12px;
  border: 3px solid var(--line); border-top-color: var(--accent);
  border-radius: 50%; animation: spin 0.9s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (prefers-reduced-motion: reduce) { .ring { animation-duration: 3s; } }

/* Buttons */
.btn {
  display: inline-block; font: inherit; font-size: 14px; font-weight: 600;
  padding: 9px 16px; border-radius: 8px; border: 1px solid var(--line);
  background: var(--bg); color: var(--fg); cursor: pointer; text-decoration: none;
  transition: filter .15s, opacity .15s;
}
.btn:hover { filter: brightness(0.97); }
.btn:disabled { opacity: .55; cursor: default; }
.btn.primary { background: var(--accent); color: var(--accent-fg); border-color: transparent; }
.btn.gold { background: var(--gold-bg); color: var(--gold); border-color: color-mix(in srgb, var(--gold) 35%, transparent); }
.btn.ghost { background: transparent; color: var(--muted); }
.btn[href=""], .btn:not([href]):not(button) { opacity: .5; pointer-events: none; }

/* Info sections */
.info { margin: 72px 0; }
.info h2 { font-size: 22px; letter-spacing: -0.01em; margin: 0 0 20px; }
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; }
.card { border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; background: var(--panel); }
.card h3 { font-size: 15px; margin: 0 0 8px; }
.card p { margin: 0; font-size: 14px; color: var(--muted); }
.card.feature { border-color: color-mix(in srgb, var(--gold) 40%, transparent); background: var(--gold-bg); }
.price { font-size: 26px; font-weight: 700; color: var(--fg) !important; margin: 0 0 4px !important; letter-spacing: -0.02em; }
.price span { font-size: 13px; font-weight: 400; color: var(--muted); }

/* Footer */
.foot { border-top: 1px solid var(--line); padding: 26px 0; margin-top: 40px; }
.foot p { margin: 0; font-size: 13px; color: var(--muted); }
.foot a { color: var(--muted); }

@media (max-width: 640px) {
  .hero { padding: 40px 0 28px; }
  .drop { padding: 38px 18px; }
}