:root {
  --bg: #f6f2e9;
  --surface: #ffffff;
  --surface-2: #efe9dc;
  --ink: #1d2925;
  --ink-2: #4c5c56;
  --line: #ddd4c2;
  --primary: #1f5c4a;
  --primary-ink: #ffffff;
  --primary-soft: #e2eee8;
  --accent: #9a6b16;
  --accent-soft: #f6ead2;
  --ok: #1f6b3a;
  --ok-soft: #e1f1e6;
  --bad: #a2342b;
  --bad-soft: #f8e3e0;
  --focus: #2b6cb0;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(30, 40, 35, .06), 0 4px 16px rgba(30, 40, 35, .06);
  --font: "Segoe UI", system-ui, -apple-system, Roboto, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
  --serif: Georgia, "Noto Serif", "Times New Roman", serif;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141a18; --surface: #1c2421; --surface-2: #242e2a; --ink: #eef2ef; --ink-2: #b5c2bc; --line: #34413c;
    --primary: #6fbf9f; --primary-ink: #0f1a16; --primary-soft: #203a31; --accent: #e0b462; --accent-soft: #3a2f1b;
    --ok: #7fd39b; --ok-soft: #1d3626; --bad: #f09a90; --bad-soft: #3d2220; --focus: #8ab8ff; color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #141a18; --surface: #1c2421; --surface-2: #242e2a; --ink: #eef2ef; --ink-2: #b5c2bc; --line: #34413c;
  --primary: #6fbf9f; --primary-ink: #0f1a16; --primary-soft: #203a31; --accent: #e0b462; --accent-soft: #3a2f1b;
  --ok: #7fd39b; --ok-soft: #1d3626; --bad: #f09a90; --bad-soft: #3d2220; --focus: #8ab8ff; color-scheme: dark;
}
* { box-sizing: border-box; }
html { font-size: 100%; -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: var(--font); font-size: 1.0625rem; line-height: 1.6; }
a { color: var(--primary); }
h1, h2, h3 { line-height: 1.3; margin: 0 0 .5em; }
h1 { font-size: 1.6rem; } h2 { font-size: 1.3rem; } h3 { font-size: 1.1rem; }
p { margin: 0 0 .8em; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 6px; }

.topbar { position: sticky; top: 0; z-index: 10; background: var(--surface); border-bottom: 1px solid var(--line); }
.topbar-in { max-width: 980px; margin: 0 auto; padding: .6rem 16px; display: flex; align-items: center; gap: .75rem; }
.brand { font-family: var(--serif); font-weight: 700; color: var(--ink); text-decoration: none; font-size: 1.05rem; line-height: 1.2; flex: 1; min-width: 0; }
.brand small { display: block; font-family: var(--font); font-weight: 400; color: var(--ink-2); font-size: .78rem; }
.font-ctl { display: flex; gap: .25rem; }
.font-ctl button { min-width: 44px; min-height: 44px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); font-weight: 700; cursor: pointer; }
.nav { max-width: 980px; margin: 0 auto; padding: 0 16px .5rem; display: flex; gap: .35rem; overflow-x: auto; scrollbar-width: none; }
.nav::-webkit-scrollbar { display: none; }
.nav a { white-space: nowrap; padding: .5rem .8rem; border-radius: 999px; text-decoration: none; color: var(--ink-2); font-size: .95rem; min-height: 44px; display: inline-flex; align-items: center; }
.nav a.on { background: var(--primary-soft); color: var(--primary); font-weight: 600; }

main { max-width: 980px; margin: 0 auto; padding: 1.25rem 16px 4rem; }
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem 1.15rem; box-shadow: var(--shadow); margin-bottom: 1rem; }
.card.soft { background: var(--surface-2); box-shadow: none; }
.grid { display: grid; gap: 1rem; }
@media (min-width: 720px) { .grid.two { grid-template-columns: 1fr 1fr; } .grid.three { grid-template-columns: repeat(3, 1fr); } }
.muted { color: var(--ink-2); }
.small { font-size: .9rem; }
.row { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; }
.spacer { flex: 1; }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: .4rem; min-height: 48px; padding: .6rem 1.2rem; border-radius: 12px; border: 1px solid var(--primary);
  background: var(--primary); color: var(--primary-ink); font: inherit; font-weight: 600; cursor: pointer; text-decoration: none; }
.btn.secondary { background: var(--surface); color: var(--primary); }
.btn.ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.btn.danger { background: var(--surface); color: var(--bad); border-color: var(--bad); }
.btn.block { width: 100%; }
.btn[disabled] { opacity: .55; cursor: not-allowed; }
.btn.sm { min-height: 40px; padding: .35rem .8rem; font-size: .92rem; }

label { display: block; font-weight: 600; margin: .8rem 0 .3rem; }
input, textarea, select { width: 100%; font: inherit; padding: .7rem .8rem; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); min-height: 48px; }
textarea { min-height: 90px; resize: vertical; }
input[type="checkbox"], input[type="radio"] { width: auto; min-height: auto; transform: scale(1.3); margin-right: .5rem; }
.form-error { color: var(--bad); background: var(--bad-soft); padding: .6rem .8rem; border-radius: 10px; margin-top: .8rem; }
.notice { background: var(--accent-soft); border-left: 4px solid var(--accent); padding: .7rem .9rem; border-radius: 10px; margin: .8rem 0; }
.ok-box { background: var(--ok-soft); border-left: 4px solid var(--ok); padding: .7rem .9rem; border-radius: 10px; margin: .8rem 0; }
.bad-box { background: var(--bad-soft); border-left: 4px solid var(--bad); padding: .7rem .9rem; border-radius: 10px; margin: .8rem 0; }

.hero { padding: 1.5rem 0 1rem; }
.hero h1 { font-family: var(--serif); font-size: 2rem; }
.steps-intro { counter-reset: s; list-style: none; padding: 0; margin: 0; }
.steps-intro li { counter-increment: s; position: relative; padding-left: 2.6rem; margin-bottom: .8rem; }
.steps-intro li::before { content: counter(s); position: absolute; left: 0; top: 0; width: 2rem; height: 2rem; border-radius: 50%; background: var(--primary-soft); color: var(--primary); font-weight: 700; display: grid; place-items: center; }

.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: .6rem; }
.stat { background: var(--surface-2); border-radius: 12px; padding: .7rem; text-align: center; }
.stat b { display: block; font-size: 1.5rem; font-variant-numeric: tabular-nums; }
.stat span { font-size: .82rem; color: var(--ink-2); }
.bar { height: 10px; background: var(--surface-2); border-radius: 999px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--primary); border-radius: 999px; }
.tag { display: inline-block; font-size: .78rem; padding: .1rem .55rem; border-radius: 999px; background: var(--surface-2); color: var(--ink-2); font-weight: 600; }
.tag.ok { background: var(--ok-soft); color: var(--ok); }
.tag.accent { background: var(--accent-soft); color: var(--accent); }
.tag.primary { background: var(--primary-soft); color: var(--primary); }
.tag.bad { background: var(--bad-soft); color: var(--bad); }

.path { list-style: none; padding: 0; margin: 0; }
.path > li { display: flex; gap: .8rem; align-items: flex-start; padding: .85rem 0; border-bottom: 1px solid var(--line); }
.path > li:last-child { border-bottom: 0; }
.path .num { flex: 0 0 2.2rem; height: 2.2rem; border-radius: 50%; display: grid; place-items: center; font-weight: 700; background: var(--surface-2); color: var(--ink-2); }
.path .num.done { background: var(--ok-soft); color: var(--ok); }
.path .num.now { background: var(--primary); color: var(--primary-ink); }
.path .body { flex: 1; min-width: 0; }
.path a.title { font-weight: 600; text-decoration: none; color: var(--ink); }

.quote { font-family: var(--serif); background: var(--accent-soft); border-left: 4px solid var(--accent); padding: .8rem 1rem; border-radius: 10px; margin: .7rem 0; }
.quote cite { display: block; font-family: var(--font); font-style: normal; font-size: .85rem; color: var(--ink-2); margin-top: .35rem; }
.label-src { font-size: .78rem; text-transform: uppercase; letter-spacing: .04em; color: var(--ink-2); font-weight: 700; margin: 1.1rem 0 .3rem; }
dl.terms { margin: 0; }
dl.terms dt { font-weight: 700; margin-top: .6rem; }
dl.terms dd { margin: 0 0 0 0; color: var(--ink); }

.q-progress { display: flex; justify-content: space-between; color: var(--ink-2); font-size: .92rem; margin-bottom: .4rem; }
.q-text { font-size: 1.15rem; font-weight: 600; margin: .6rem 0 1rem; }
.opts { display: grid; gap: .6rem; }
.opt { text-align: left; display: flex; gap: .75rem; align-items: flex-start; width: 100%; min-height: 56px; padding: .8rem .9rem; border-radius: 12px; border: 2px solid var(--line); background: var(--surface); color: var(--ink); font: inherit; cursor: pointer; }
.opt .k { flex: 0 0 2rem; height: 2rem; border-radius: 8px; display: grid; place-items: center; background: var(--surface-2); font-weight: 700; }
.opt.sel { border-color: var(--primary); background: var(--primary-soft); }
.opt.sel .k { background: var(--primary); color: var(--primary-ink); }
.opt.right { border-color: var(--ok); background: var(--ok-soft); }
.opt.wrong { border-color: var(--bad); background: var(--bad-soft); }
.dots { display: flex; flex-wrap: wrap; gap: .3rem; margin: 1rem 0; }
.dots button { width: 2.2rem; height: 2.2rem; border-radius: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); cursor: pointer; font-size: .85rem; }
.dots button.ans { background: var(--primary-soft); border-color: var(--primary); }
.dots button.cur { outline: 2px solid var(--primary); }

.review { border-top: 1px solid var(--line); padding-top: .9rem; margin-top: .9rem; }
.review .why { font-size: .95rem; }
.review ul { padding-left: 1.2rem; margin: .4rem 0; }

table { width: 100%; border-collapse: collapse; font-size: .95rem; }
th, td { text-align: left; padding: .55rem .5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: .82rem; color: var(--ink-2); font-weight: 700; }
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
td.num, th.num { text-align: right; font-variant-numeric: tabular-nums; }

.book { display: flex; gap: .9rem; align-items: flex-start; }
.cover { flex: 0 0 72px; height: 100px; border-radius: 8px; background: linear-gradient(160deg, var(--primary), #163f33); color: #f6f2e9; font-family: var(--serif); font-size: .7rem; padding: .4rem; display: flex; align-items: flex-end; overflow: hidden; }
.cover img { width: 100%; height: 100%; object-fit: cover; border-radius: 6px; }
.cover.has-img { padding: 0; background: var(--surface-2); }
.qty { display: flex; align-items: center; gap: .3rem; }
.qty button { width: 44px; height: 44px; border-radius: 10px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); font-size: 1.2rem; cursor: pointer; }
.qty output { min-width: 2ch; text-align: center; font-weight: 700; }
.sticky-cart { position: sticky; bottom: 0; background: var(--surface); border-top: 1px solid var(--line); padding: .8rem 16px; margin: 0 -16px; box-shadow: 0 -4px 16px rgba(0,0,0,.06); }

.tabs { display: flex; gap: .35rem; overflow-x: auto; margin-bottom: 1rem; }
.tabs button { white-space: nowrap; min-height: 44px; padding: .4rem .9rem; border-radius: 999px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); cursor: pointer; font: inherit; }
.tabs button.on { background: var(--primary); color: var(--primary-ink); border-color: var(--primary); }
.empty { text-align: center; padding: 2rem 1rem; color: var(--ink-2); }
.toast { position: fixed; left: 50%; bottom: 1.2rem; transform: translateX(-50%); background: var(--ink); color: var(--bg); padding: .7rem 1.1rem; border-radius: 12px; z-index: 50; max-width: calc(100% - 32px); }
.loading { padding: 3rem 0; text-align: center; color: var(--ink-2); }
.tf { display: flex; gap: .6rem; margin-top: .6rem; }
.tf .btn { flex: 1; }
details summary { cursor: pointer; font-weight: 600; min-height: 44px; display: flex; align-items: center; }
.footer { text-align: center; color: var(--ink-2); font-size: .85rem; padding: 2rem 16px; }
@media print { .topbar, .nav, .font-ctl { display: none; } }