:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #eef0f4;
  --text: #16181d;
  --muted: #545b68;
  --border: #d7dbe2;
  --accent: #1f5fd6;
  --accent-text: #ffffff;
  --accent-soft: #e4ecfb;
  --focus: #1f5fd6;
  --error-bg: #fde7e5; --error: #8a1c12;
  --warn-bg: #fff1d6; --warn: #7a4b00;
  --note-bg: #e4ecfb; --note: #1d468f;
  --ok-bg: #e3f4e8; --ok: #1c5c33;
  --code-bg: #f1f3f6;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 1px 3px rgba(16, 24, 40, .08);
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111317;
    --surface: #1a1d23;
    --surface-2: #23272f;
    --text: #eceef2;
    --muted: #a6adba;
    --border: #343a45;
    --accent: #7aa7ff;
    --accent-text: #0b1220;
    --accent-soft: #1d2a44;
    --focus: #9cbcff;
    --error-bg: #4a1d1a; --error: #ffb4ab;
    --warn-bg: #43320f; --warn: #ffd58a;
    --note-bg: #1d2a44; --note: #b9cfff;
    --ok-bg: #173523; --ok: #9fdcb3;
    --code-bg: #23272f;
    --shadow: none;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif;
}
a { color: var(--accent); }
img { max-width: 100%; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
code, pre, textarea.mono { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: .88em; }
code { background: var(--code-bg); padding: 1px 5px; border-radius: 4px; overflow-wrap: anywhere; }
.wrap { max-width: 1100px; margin: 0 auto; padding: 0 16px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

header.top { padding: 28px 0 8px; }
header.top h1 { font-size: clamp(1.5rem, 4vw, 2.1rem); line-height: 1.2; margin: 0 0 6px; letter-spacing: -.01em; }
header.top p { margin: 0; color: var(--muted); max-width: 70ch; }
.privacy { display: inline-flex; gap: 6px; align-items: center; margin-top: 10px; font-size: .9rem; color: var(--muted); }

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px;
  margin: 18px 0;
}
.panel h2 { margin-top: 0; }

.tabs { display: flex; gap: 4px; flex-wrap: wrap; border-bottom: 1px solid var(--border); margin: -4px 0 16px; }
.tabs [role="tab"] {
  font: inherit; font-weight: 600; background: none; border: 0; border-bottom: 3px solid transparent;
  color: var(--muted); padding: 8px 12px; cursor: pointer; margin-bottom: -1px;
}
.tabs [role="tab"][aria-selected="true"] { color: var(--text); border-bottom-color: var(--accent); }

label { font-weight: 600; display: block; margin: 0 0 4px; }
.hint { color: var(--muted); font-size: .9rem; margin: 4px 0 10px; }
input[type="text"], input[type="url"], textarea, select {
  font: inherit; width: 100%; padding: 9px 11px; border-radius: 8px;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
}
textarea { min-height: 180px; resize: vertical; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
.row > .grow { flex: 1 1 240px; }

.btn {
  font: inherit; font-weight: 600; font-size: .95rem; cursor: pointer;
  border-radius: 8px; padding: 9px 14px; border: 1px solid var(--border);
  background: var(--surface-2); color: var(--text); text-decoration: none; display: inline-flex; align-items: center; gap: 6px;
}
.btn:hover { filter: brightness(.97); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-text); }
.btns { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }

.bm-box { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
.bookmarklet {
  display: inline-block; padding: 12px 18px; border-radius: 999px; font-weight: 700;
  background: var(--accent); color: var(--accent-text); text-decoration: none; cursor: grab;
  border: 2px dashed transparent;
}
.bookmarklet:hover { border-color: var(--accent-text); }
ol.steps { padding-left: 1.3em; margin: 8px 0; }
ol.steps li { margin: 4px 0; }

.msg, .hint { overflow-wrap: anywhere; }
.msg { border-radius: 8px; padding: 10px 12px; margin: 12px 0 0; font-size: .95rem; }
.msg.err { background: var(--error-bg); color: var(--error); }
.msg.info { background: var(--note-bg); color: var(--note); }
.msg.good { background: var(--ok-bg); color: var(--ok); }
.msg:empty { display: none; }

/* report */
#report[hidden] { display: none; }
.summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 8px; margin: 8px 0 14px; }
.stat { border-radius: 8px; padding: 10px 12px; }
.stat b { display: block; font-size: 1.5rem; line-height: 1.1; }
.stat.error { background: var(--error-bg); color: var(--error); }
.stat.warn { background: var(--warn-bg); color: var(--warn); }
.stat.note { background: var(--note-bg); color: var(--note); }
.stat.ok { background: var(--ok-bg); color: var(--ok); }
.report-tools { display: flex; flex-wrap: wrap; gap: 8px; align-items: center; margin-bottom: 8px; }
.report-tools select { width: auto; }
.report-tools .check { display: inline-flex; gap: 6px; align-items: center; font-weight: 400; margin: 0; }
.items { list-style: none; margin: 0; padding: 0; }
.item { display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 12px; padding: 12px 0; border-top: 1px solid var(--border); }
.thumb {
  width: 72px; height: 72px; border-radius: 8px; background: var(--surface-2); object-fit: contain;
  display: flex; align-items: center; justify-content: center; font-size: .72rem; color: var(--muted); text-align: center; overflow: hidden;
}
.badge { display: inline-block; border-radius: 99px; padding: 1px 9px; font-size: .78rem; font-weight: 700; margin-right: 6px; }
.badge.error { background: var(--error-bg); color: var(--error); }
.badge.warn { background: var(--warn-bg); color: var(--warn); }
.badge.note { background: var(--note-bg); color: var(--note); }
.badge.ok { background: var(--ok-bg); color: var(--ok); }
.item .meta { color: var(--muted); font-size: .9rem; }
.item .alt { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: .88rem; overflow-wrap: anywhere; margin: 4px 0; }
.item ul { margin: 4px 0; padding-left: 1.1em; }
.item details { font-size: .85rem; color: var(--muted); }
.item details code { display: block; white-space: pre-wrap; margin-top: 4px; }

/* helper */
fieldset { border: 1px solid var(--border); border-radius: 8px; padding: 12px; margin: 0 0 12px; }
legend { font-weight: 700; padding: 0 4px; }
.choices { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 8px; }
.choice { display: flex; gap: 8px; align-items: flex-start; font-weight: 400; padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; cursor: pointer; margin: 0; }
.choice input { margin-top: 4px; }
.choice small { display: block; color: var(--muted); }
.choice:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.field { margin: 0 0 12px; }
.inline-check { display: flex; gap: 8px; align-items: center; font-weight: 400; }
.out { background: var(--surface-2); border-radius: 8px; padding: 12px; }
.out textarea { min-height: 70px; }
.lint { margin: 8px 0 0; padding-left: 1.1em; font-size: .92rem; }

/* content */
main section.content { margin: 34px 0; }
main section.content h2 { font-size: 1.4rem; margin: 0 0 10px; }
main section.content h3 { font-size: 1.1rem; margin: 20px 0 6px; }
main section.content p, main section.content li { max-width: 75ch; }
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: .93rem; }
th, td { text-align: left; vertical-align: top; padding: 9px 10px; border-bottom: 1px solid var(--border); }
th { background: var(--surface-2); }
tr:last-child td { border-bottom: 0; }
td code { white-space: normal; }
.bad { color: var(--error); font-weight: 700; }
.good { color: var(--ok); font-weight: 700; }
.faq details { background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 10px 14px; margin: 8px 0; }
.faq summary { font-weight: 700; cursor: pointer; }
.faq summary h3 { display: inline; font-size: 1rem; margin: 0; }

footer { border-top: 1px solid var(--border); margin-top: 40px; padding: 20px 0 40px; color: var(--muted); font-size: .92rem; }
footer ul { list-style: none; padding: 0; margin: 10px 0; display: flex; flex-wrap: wrap; gap: 6px 16px; }

@media (max-width: 520px) {
  .panel { padding: 14px; }
  .item { grid-template-columns: 56px minmax(0, 1fr); }
  .thumb { width: 56px; height: 56px; }
  th, td { padding: 7px 8px; }
}