:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1a2332;
  --muted: #64748b;
  --line: #e2e8f0;
  --brand: #2f6fed;
  --brand-dark: #2456c4;
  --ok: #16a34a;
  --ok-bg: #ecfdf3;
  --warn: #d97706;
  --warn-bg: #fffbeb;
  --danger: #dc2626;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(16, 24, 40, .08), 0 8px 24px rgba(16, 24, 40, .06);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 780px; margin: 0 auto; padding: 0 20px; }

header.site {
  border-bottom: 1px solid var(--line);
  background: var(--card);
}
header.site .wrap { display: flex; align-items: center; justify-content: space-between; height: 56px; }
.brand { font-weight: 700; font-size: 18px; text-decoration: none; color: var(--text); }
.brand b { color: var(--brand); }
header.site nav a { color: var(--muted); font-size: 13.5px; text-decoration: none; margin-left: 16px; }
header.site nav a:hover { color: var(--brand); }

main { padding: 40px 0 56px; }

.hero { text-align: center; margin-bottom: 28px; }
.hero h1 { font-size: clamp(26px, 4.5vw, 38px); line-height: 1.2; letter-spacing: -0.5px; }
.hero h1 span { color: var(--brand); }
.hero p { color: var(--muted); max-width: 600px; margin: 12px auto 0; font-size: 16px; }
.hero .promise { color: var(--ok); font-weight: 600; }

.badges { display: flex; gap: 10px; justify-content: center; flex-wrap: wrap; margin-top: 14px; }
.badge { font-size: 12.5px; background: var(--card); border: 1px solid var(--line); color: var(--muted); padding: 4px 12px; border-radius: 999px; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  margin-top: 24px;
}

.dropzone {
  border: 2px dashed #c6d2e0;
  border-radius: var(--radius);
  padding: 40px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color .15s, background .15s;
  background: #fbfcfe;
}
.dropzone:hover, .dropzone.over { border-color: var(--brand); background: #f0f5ff; }
.dropzone .dz-main { font-weight: 600; font-size: 16px; }
.dropzone .dz-sub { color: var(--muted); font-size: 13.5px; margin-top: 6px; }
.dropzone .dz-file { font-size: 14px; color: var(--text); font-weight: 600; word-break: break-all; }

.field { margin-top: 18px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; color: var(--text); margin-bottom: 8px; }

.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.chip {
  border: 1px solid var(--line); background: var(--card); color: var(--text);
  padding: 6px 16px; border-radius: 999px; font-size: 14px; cursor: pointer; transition: all .12s;
}
.chip:hover { border-color: var(--brand); color: var(--brand); }
.chip.on { background: var(--brand); border-color: var(--brand); color: #fff; }

.target-row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.target-input {
  width: 130px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 8px; font-size: 15px; color: var(--text);
}
.target-input:focus { outline: none; border-color: var(--brand); }
.target-row .unit { color: var(--muted); font-size: 14px; }

.btn {
  border: 0; border-radius: 8px; font-size: 15px; font-weight: 600; cursor: pointer; padding: 12px 20px; transition: all .12s;
}
.btn.brand { background: var(--brand); color: #fff; }
.btn.brand:hover { background: var(--brand-dark); }
.btn.brand:disabled { background: #9db4e8; cursor: not-allowed; }
.btn.ghost { background: transparent; border: 1px solid var(--line); color: var(--text); }
.btn.ghost:hover { border-color: var(--brand); color: var(--brand); }
.btn.block { width: 100%; }

.result { border-top: 1px solid var(--line); margin-top: 20px; padding-top: 20px; }
.result .status { font-weight: 700; font-size: 18px; margin-bottom: 12px; display: flex; align-items: center; gap: 8px; }
.result .status.ok { color: var(--ok); }
.result .status.soft { color: var(--warn); }
.result-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.r-item { background: #f8fafc; border: 1px solid var(--line); border-radius: 10px; padding: 12px 14px; }
.r-item .k { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: .04em; }
.r-item .v { font-size: 17px; font-weight: 700; margin-top: 2px; }
.result-actions { display: flex; gap: 10px; margin-top: 16px; flex-wrap: wrap; }
.notice { font-size: 13.5px; margin-top: 12px; padding: 10px 12px; border-radius: 8px; }
.notice.warn { background: var(--warn-bg); color: var(--warn); }
.notice.info { background: #f1f5f9; color: var(--muted); }
.error { margin-top: 14px; padding: 10px 12px; border-radius: 8px; background: #fef2f2; color: var(--danger); font-size: 14px; }

.howto { margin-top: 24px; }
.howto h2 { font-size: 20px; margin-bottom: 12px; }
.howto ol { padding-left: 20px; color: var(--text); }
.howto li { margin-bottom: 8px; }
.howto .muted, .faq .muted { font-size: 13.5px; color: var(--text); }

.faq h2, .howto h2 { font-size: 20px; margin-bottom: 12px; }
.faq details { border: 1px solid var(--line); border-radius: 10px; padding: 12px 16px; margin-bottom: 10px; background: var(--card); }
.faq summary { font-weight: 600; cursor: pointer; font-size: 15px; }
.faq details p { margin-top: 8px; font-size: 14.5px; color: var(--text); }

footer.site { border-top: 1px solid var(--line); background: var(--card); padding: 24px 0; }
footer.site .cols { display: flex; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
footer.site .cols .col h4 { font-size: 13px; color: var(--muted); margin-bottom: 8px; text-transform: uppercase; letter-spacing: .05em; }
footer.site a { display: block; color: var(--text); font-size: 14px; text-decoration: none; margin-bottom: 6px; }
footer.site a:hover { color: var(--brand); }
footer.site .legal { margin-top: 18px; font-size: 12.5px; color: var(--muted); }

@media (max-width: 560px) {
  .result-grid { grid-template-columns: 1fr; }
  .card { padding: 16px; }
}