:root {
  --ink: #111;
  --muted: #444;
  --bg: #fff;
  --soft: #f3f4f6;
  --line: #c9ccd2;
  --navy: #0b2a5b;
  --navy-2: #163f85;
  --green: #0a6b2d;
  --green-bg: #e6f4ea;
  --amber: #8a5300;
  --amber-bg: #fff4dc;
  --red: #a11a1a;
  --red-bg: #fdecec;
  --orange: #d46a00;
  --base: 20px;
}
html[data-size="large"] { --base: 23px; }
html[data-size="xl"] { --base: 26px; }
* { box-sizing: border-box; }
html { font-size: var(--base); -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.55; padding-bottom: 5.2rem;
}
.top { background: var(--navy); color: #fff; padding: .7rem 1rem; }
.brand { color: #fff; text-decoration: none; font-weight: 800; font-size: 1.1rem; letter-spacing: .02em; }
main { max-width: 760px; margin: 0 auto; padding: 1.2rem 1rem 2rem; outline: none; }
h1 { font-size: 1.6rem; line-height: 1.25; margin: .2rem 0 .8rem; }
h2 { font-size: 1.25rem; margin: 1.6rem 0 .6rem; }
p { margin: 0 0 1rem; }
a { color: var(--navy-2); }
.muted { color: var(--muted); }
.small { font-size: .85rem; }

.btn {
  display: block; width: 100%; min-height: 3.3rem; padding: .8rem 1.2rem; margin: 1rem 0;
  font: inherit; font-size: 1.1rem; font-weight: 700; text-align: center; text-decoration: none;
  border-radius: 12px; border: 3px solid var(--navy); background: var(--navy); color: #fff; cursor: pointer;
}
.btn:hover { background: var(--navy-2); }
.btn:focus-visible, input:focus-visible, textarea:focus-visible, .tabs a:focus-visible { outline: 4px solid var(--orange); outline-offset: 2px; }
.btn.secondary { background: #fff; color: var(--navy); }
.btn.big { font-size: 1.3rem; min-height: 4rem; }
.linkbtn { background: none; border: 0; color: var(--navy-2); font: inherit; text-decoration: underline; cursor: pointer; padding: .4rem 0; }

.card { border: 2px solid var(--line); border-radius: 14px; padding: 1rem 1.1rem; margin: 1rem 0; background: #fff; }
.card.hero { background: var(--soft); border-color: var(--soft); }
.label { font-size: .8rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: .2rem; }
.topic { font-size: 1.5rem; font-weight: 800; }
.streak { font-size: 1.15rem; font-weight: 700; }
.streak b { font-size: 1.6rem; color: var(--orange); }

/* Reading */
.meta { color: var(--muted); font-size: .9rem; margin-bottom: 1rem; }
.article p { font-size: 1.05rem; line-height: 1.7; }
.tip { background: var(--amber-bg); border-left: 6px solid #f2a900; padding: .7rem 1rem; border-radius: 8px; margin: .8rem 0 1.2rem; }

/* Writing */
.field { margin: 1.1rem 0; }
.field label { display: block; font-weight: 800; font-size: 1.05rem; }
.field .hint { display: block; color: var(--muted); font-size: .9rem; margin-bottom: .3rem; }
textarea {
  width: 100%; font: inherit; font-size: 1rem; padding: .7rem .8rem; border: 2px solid #777; border-radius: 10px;
  resize: vertical; min-height: 3.2rem; color: var(--ink); background: #fff;
}
.step { display: inline-block; background: var(--navy); color: #fff; border-radius: 99px; width: 1.6rem; height: 1.6rem; text-align: center; line-height: 1.6rem; font-size: .85rem; margin-right: .4rem; }

/* Feedback */
.scores { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; margin: 1rem 0; }
.score { border-radius: 14px; padding: .9rem; text-align: center; background: var(--soft); }
.score .num { font-size: 2.6rem; font-weight: 900; line-height: 1.1; }
.score .num small { font-size: 1.1rem; color: var(--muted); }
.score .what { font-size: .85rem; color: var(--muted); }
.score.recall .num { color: var(--navy); }
.score.clarity .num { color: var(--orange); }
.good, .fix { border-radius: 12px; padding: .8rem 1rem; margin: .8rem 0; border-left: 8px solid; }
.good { background: var(--green-bg); border-color: var(--green); }
.fix { background: var(--amber-bg); border-color: #f2a900; }
.good .label { color: var(--green); }
.fix .label { color: var(--amber); }
.points { list-style: none; padding: 0; margin: 0; }
.points li { border-radius: 10px; padding: .7rem .9rem; margin: .5rem 0; border: 2px solid; }
.points li .tag { display: block; font-weight: 800; font-size: .85rem; text-transform: uppercase; letter-spacing: .04em; }
.points li.got { background: var(--green-bg); border-color: var(--green); }
.points li.got .tag { color: var(--green); }
.points li.partly { background: var(--amber-bg); border-color: #e0a100; }
.points li.partly .tag { color: var(--amber); }
.points li.missed { background: #fff; border-color: var(--red); border-style: dashed; }
.points li.missed .tag { color: var(--red); }
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: .8rem; }
.compare .col { border: 2px solid var(--line); border-radius: 12px; padding: .8rem 1rem; }
.compare .col.model { border-color: var(--green); }
.compare h3 { margin: 0 0 .5rem; font-size: 1.05rem; }
.compare .part { margin: 0 0 .7rem; }
.compare .part .label { font-size: .7rem; }
.compare ul { margin: .2rem 0 0; padding-left: 1.1rem; }
.empty { color: #888; font-style: italic; }
.remember { background: var(--navy); color: #fff; border-radius: 14px; padding: 1.1rem 1.2rem; margin: 1.5rem 0 1rem; font-size: 1.2rem; font-weight: 800; line-height: 1.4; }
.remember .label { color: #c9d6f0; }

/* Progress */
.chart { width: 100%; height: auto; display: block; }
.legend { display: flex; gap: 1.2rem; font-size: .9rem; margin-top: .3rem; }
.legend span::before { content: ""; display: inline-block; width: .9rem; height: .9rem; border-radius: 3px; margin-right: .35rem; vertical-align: -2px; background: var(--c); }
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: .6rem; }
.stat { background: var(--soft); border-radius: 12px; padding: .7rem; text-align: center; }
.stat b { display: block; font-size: 1.7rem; }
.stat span { font-size: .8rem; color: var(--muted); }
.history { list-style: none; padding: 0; }
.history li { border-bottom: 1px solid var(--line); padding: .6rem 0; }

/* Settings */
.toggle { display: flex; align-items: center; gap: .8rem; padding: .75rem .4rem; border-bottom: 1px solid var(--line); cursor: pointer; font-size: 1.05rem; }
.toggle input { width: 1.6rem; height: 1.6rem; accent-color: var(--navy); flex: none; }
.seg { display: flex; gap: .5rem; flex-wrap: wrap; }
.seg button { flex: 1; min-height: 3rem; font: inherit; font-weight: 700; border: 2px solid var(--navy); background: #fff; color: var(--navy); border-radius: 10px; cursor: pointer; }
.seg button[aria-pressed="true"] { background: var(--navy); color: #fff; }
input[type="email"] { width: 100%; font: inherit; padding: .7rem .8rem; border: 2px solid #777; border-radius: 10px; }

.loading { text-align: center; padding: 3rem 0; }
.spinner { width: 3rem; height: 3rem; border: 6px solid var(--soft); border-top-color: var(--navy); border-radius: 50%; margin: 0 auto 1rem; animation: spin 1s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.notice { background: var(--red-bg); border-left: 6px solid var(--red); padding: .8rem 1rem; border-radius: 8px; }

/* Bottom tabs */
.tabs { position: fixed; bottom: 0; left: 0; right: 0; display: flex; background: #fff; border-top: 2px solid var(--line); padding-bottom: env(safe-area-inset-bottom); z-index: 5; }
.tabs a { flex: 1; text-align: center; padding: .9rem .2rem; font-weight: 800; color: var(--muted); text-decoration: none; font-size: 1rem; border-top: 5px solid transparent; }
.tabs a.on { color: var(--navy); border-top-color: var(--navy); }
body.focus .tabs { display: none; }
body.focus { padding-bottom: 1rem; }

@media (max-width: 640px) {
  :root { --base: 18px; }
  html[data-size="large"] { --base: 21px; }
  html[data-size="xl"] { --base: 24px; }
  .compare { grid-template-columns: 1fr; }
  h1 { font-size: 1.45rem; }
}
.card.sync { border-color: var(--navy, #0b2a5b); }
.card.sync h2 { margin-top: 0; }
.ok-line { color: #0a6b2d; font-weight: 700; font-size: 1.2em; margin: .2rem 0 .5rem; }
.steps { margin: .4rem 0 1rem; padding-left: 1.4rem; }
.steps li { margin: .25rem 0; }
.signmsg { margin-top: .7rem; }
.card.sync .btn { margin-top: .8rem; }