:root {
  --bg: #eaf5fa; --panel: #ffffff; --ink: #123243; --muted: #4a6577;
  --line: #c9e2ee; --accent: #0b6aa8; --accent-ink: #ffffff;
  --good: #0b6e55; --warn: #8f5a00; --bad: #b93a3a;
  --chip: #e2f1f8; --mark: #ffe3a3; --mark-ink: #5c3d00;
  --inv: #ffd9d9; --inv-ink: #8a1c1c;
  --wash: #d6edf7; --bubble: rgba(11,106,168,.09); --ring: rgba(11,106,168,.25);
  --struct: #6d47c4; --grade-d: #b45309;
}
/* Dark is an explicit choice (persisted toggle), not the OS default — the light
   "suds" theme is the brand. */
:root.dark {
  --bg: #1c2a36; --panel: #243546; --ink: #eaf3f9; --muted: #a7c0d2;
  --line: #3a5064; --accent: #7cc4ef; --accent-ink: #0e2230;
  --good: #69d3ac; --warn: #f2c069; --bad: #f49d9d;
  --chip: #2c4152; --mark: #7a6220; --mark-ink: #ffeab8;
  --inv: #7e2f2f; --inv-ink: #ffd6d6;
  --wash: #223444; --bubble: rgba(124,196,239,.10); --ring: rgba(124,196,239,.30);
  --struct: #c3aaf2; --grade-d: #eda060;
}
* { box-sizing: border-box; }
body { margin: 0; background: linear-gradient(180deg, var(--wash) 0, var(--bg) 280px) fixed var(--bg); color: var(--ink); font: 16px/1.55 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.wrap { max-width: 980px; margin: 0 auto; padding: 24px 16px 64px; }
header { text-align: center; padding: 28px 0 8px; position: relative; }
header::before { content: ""; position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(circle at 15% 25%, var(--bubble) 0 9px, transparent 10px),
    radial-gradient(circle at 85% 18%, var(--bubble) 0 13px, transparent 14px),
    radial-gradient(circle at 72% 78%, var(--bubble) 0 6px, transparent 7px),
    radial-gradient(circle at 28% 80%, var(--bubble) 0 5px, transparent 6px); }
h1 { font-size: clamp(1.7rem, 4.5vw, 2.5rem); margin: 0 0 6px; letter-spacing: -0.02em; }
.tag { color: var(--muted); margin: 0 auto 4px; max-width: 620px; }
.privacy { display: inline-block; margin-top: 10px; font-size: .85rem; color: var(--good); background: var(--chip); border: 1px solid var(--line); border-radius: 999px; padding: 4px 12px; }
.grid { display: grid; gap: 16px; grid-template-columns: 1fr; margin-top: 20px; }
@media (min-width: 860px) { .grid { grid-template-columns: 1fr 1fr; } }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 16px; padding: 16px; box-shadow: 0 1px 2px rgba(18,50,67,.05), 0 10px 28px rgba(18,50,67,.07); }
.card h2 { font-size: 1rem; margin: 0 0 10px; display: flex; align-items: center; gap: 8px; }
textarea { width: 100%; min-height: 260px; resize: vertical; border: 1px solid var(--line); border-radius: 10px; background: var(--bg); color: var(--ink); padding: 12px; font: 15px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
textarea:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 4px var(--ring); }
.btnrow { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
button { border: 1px solid var(--line); background: var(--panel); color: var(--ink); border-radius: 10px; padding: 10px 14px; font-size: .95rem; cursor: pointer; }
button.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; border-radius: 999px; box-shadow: 0 2px 10px rgba(11,106,168,.30); }
button.primary:hover { filter: none; transform: translateY(-1px); box-shadow: 0 4px 14px rgba(11,106,168,.35); }
button:hover { filter: brightness(1.05); }
button:disabled { opacity: .5; cursor: default; }
.score { display: flex; align-items: baseline; gap: 10px; margin: 4px 0 10px; }
.score .num { font-size: 2.4rem; font-weight: 800; letter-spacing: -0.03em; }
.score .lbl { color: var(--muted); }
.score.clean .num { color: var(--good); }
.score.dirty .num { color: var(--bad); }
.findings { display: flex; flex-direction: column; gap: 8px; }
.finding { display: flex; justify-content: space-between; gap: 10px; align-items: center; background: var(--chip); border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; font-size: .92rem; }
.finding .n { font-weight: 700; min-width: 2.2em; text-align: right; }
.finding.f-invisible .n { color: var(--bad); }
.finding.f-typo .n { color: var(--warn); }
.finding.f-style .n { color: var(--accent); }
.empty { color: var(--muted); font-size: .95rem; }
.preview { border: 1px solid var(--line); border-radius: 10px; background: var(--bg); padding: 12px; min-height: 120px; max-height: 320px; overflow: auto; white-space: pre-wrap; word-wrap: break-word; font: 14px/1.6 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.preview mark { background: var(--mark); color: var(--mark-ink); border-radius: 3px; padding: 0 1px; }
.preview mark.inv { background: var(--inv); color: var(--inv-ink); font-weight: 700; font-size: .8em; padding: 0 3px; border-radius: 4px; }
.opts { display: flex; flex-wrap: wrap; gap: 6px 14px; margin: 10px 0 2px; font-size: .88rem; color: var(--muted); }
.opts label { display: inline-flex; gap: 6px; align-items: center; cursor: pointer; }
.toast { position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: 10px 18px; border-radius: 999px; font-size: .9rem; opacity: 0; pointer-events: none; transition: opacity .25s; }
.toast.show { opacity: 1; }
section.prose { max-width: 760px; margin: 40px auto 0; }
section.prose h2 { font-size: 1.25rem; margin: 28px 0 8px; }
section.prose p, section.prose li { color: var(--muted); }
section.prose strong { color: var(--ink); }
footer { margin-top: 48px; text-align: center; color: var(--muted); font-size: .88rem; }
footer a { color: var(--accent); text-decoration: none; }
.support { display: inline-block; margin: 18px auto 0; background: var(--chip); border: 1px solid var(--line); border-radius: 12px; padding: 10px 16px; font-size: .92rem; color: var(--muted); }
.kbd { background: var(--chip); border: 1px solid var(--line); border-radius: 5px; padding: 0 5px; font: .85em ui-monospace, monospace; }
.counter { color: var(--good); font-weight: 600; margin: 14px 0 2px; }
.toolnav { margin: 10px 0 2px; color: var(--muted); font-size: .9rem; }
.toolnav a { color: var(--accent); text-decoration: none; margin: 0 2px; }
.viewbar { margin: 0 0 10px; }
.viewbar button { font-size: .85rem; padding: 6px 12px; }
.finding.f-struct .n { color: var(--struct); }
.rhythm { font-size: .85rem; color: var(--muted); margin: -2px 0 10px; }
#grade { margin-left: auto; font-weight: 800; font-size: 1.6rem; padding: 2px 14px; border-radius: 10px; border: 2px solid; }
.g-A { color: var(--good); border-color: var(--good); }
.g-B { color: var(--accent); border-color: var(--accent); }
.g-C { color: var(--warn); border-color: var(--warn); }
.g-D { color: var(--grade-d); border-color: var(--grade-d); }
.g-F { color: var(--bad); border-color: var(--bad); }
.hm { border-left: 5px solid; border-radius: 6px; padding: 8px 10px; margin: 0 0 8px; font-size: .82rem; white-space: pre-wrap; position: relative; background: var(--chip); }
.hm-clean { border-color: var(--good); }
.hm-low { border-color: var(--accent); }
.hm-mid { border-color: var(--warn); }
.hm-high { border-color: var(--bad); }
.hm-badge { display: block; font-weight: 700; font-size: .75rem; margin-bottom: 3px; color: var(--muted); }
.themebtn { position: fixed; top: 12px; right: 12px; z-index: 50; border-radius: 999px; width: 40px; height: 40px; padding: 0; font-size: 1.1rem; line-height: 1; box-shadow: 0 2px 8px rgba(18,50,67,.15); }