:root {
  --paper: #f6f4ef;
  --ink: #1a1d21;
  --ink-soft: #565b63;
  --line: #dcd7cd;
  --card: #fffefb;
  --amber: #d99400;
  --amber-soft: #f6e6bd;
  --green: #2e9e5b;
  --green-soft: #dcefe2;
  --red: #d64545;
  --red-soft: #f5dcdc;
  --blue: #3a6ea5;
  --shadow: 0 1px 2px rgba(26,29,33,.06), 0 10px 30px -16px rgba(26,29,33,.22);
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #16181c; --ink: #eceae4; --ink-soft: #a2a6ae; --line: #2c3037;
    --card: #1e2127; --amber: #f2b705; --amber-soft: #3a3115; --green: #47c07a;
    --green-soft: #17301f; --red: #e56b6b; --red-soft: #331a1a; --blue: #7ea9d8;
    --shadow: 0 1px 2px rgba(0,0,0,.3), 0 12px 32px -16px rgba(0,0,0,.7);
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper); color: var(--ink); font-family: var(--sans);
  line-height: 1.5; -webkit-font-smoothing: antialiased;
  padding: env(safe-area-inset-top) 0 env(safe-area-inset-bottom);
}
.hidden { display: none !important; }
button { font-family: inherit; cursor: pointer; }

/* ---------- ЛОГИН ---------- */
.login { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-box {
  background: var(--card); border: 1px solid var(--line); border-radius: 18px;
  box-shadow: var(--shadow); padding: 32px 28px; width: 100%; max-width: 360px;
  display: flex; flex-direction: column; gap: 14px; text-align: center;
}
.login-logo { font-size: 44px; }
.login-box h1 { margin: 0; font-size: 24px; letter-spacing: -.02em; }
.login-sub { margin: 0; color: var(--ink-soft); font-size: 14px; }
.login-box input {
  padding: 13px 15px; border-radius: 11px; border: 1px solid var(--line);
  background: var(--paper); color: var(--ink); font-size: 16px; text-align: center;
}
.login-box input:focus { outline: 2px solid var(--amber); border-color: var(--amber); }
.login-box button {
  padding: 13px; border-radius: 11px; border: 0; background: var(--amber);
  color: #1a1d21; font-weight: 700; font-size: 16px;
}
.login-err { color: var(--red); font-size: 13px; min-height: 18px; }

/* ---------- APP ---------- */
#app { max-width: 720px; margin: 0 auto; padding: 0 16px 40px; }

.statbar {
  position: sticky; top: 0; z-index: 5;
  display: flex; align-items: stretch; gap: 0;
  background: var(--card); border: 1px solid var(--line); border-radius: 0 0 16px 16px;
  box-shadow: var(--shadow); margin-bottom: 0; overflow: hidden;
}
.stat { flex: 1; padding: 12px 6px; text-align: center; border-right: 1px solid var(--line); }
.stat .v {
  font-size: 22px; font-weight: 800; letter-spacing: -.02em; line-height: 1;
  font-variant-numeric: tabular-nums;
}
.stat .v.g { color: var(--green); }
.stat .v.a { color: var(--amber); }
.stat .l {
  font-size: 10px; color: var(--ink-soft); margin-top: 5px;
  text-transform: uppercase; letter-spacing: .05em; font-family: var(--mono);
}
.statbar .ghost {
  border: 0; background: transparent; font-size: 20px; padding: 0 16px; color: var(--ink-soft);
}
.ghost:hover { color: var(--ink); }

.progressbar { height: 6px; background: var(--line); border-radius: 3px; margin: 10px 0 16px; overflow: hidden; }
.progressbar > i { display: block; height: 100%; width: 0%;
  background: linear-gradient(90deg, var(--amber), var(--green)); transition: width .4s ease; }

.card {
  background: var(--card); border: 1px solid var(--line); border-radius: 16px;
  box-shadow: var(--shadow); padding: 20px;
}
.qmeta { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-bottom: 14px; }
.qmeta .theme {
  font-family: var(--mono); font-size: 11px; color: var(--amber); font-weight: 700;
  text-transform: uppercase; letter-spacing: .04em; line-height: 1.3;
}
.qmeta .src { font-size: 12px; color: var(--blue); text-decoration: none; white-space: nowrap; }

.qimg-wrap { margin-bottom: 16px; border-radius: 10px; overflow: hidden; border: 1px solid var(--line); }
.qimg-wrap img { display: block; width: 100%; height: auto; }

.qtext { font-size: 18px; font-weight: 600; line-height: 1.35; margin: 0 0 18px; text-wrap: pretty; }

.answers { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.answers li {
  border: 1px solid var(--line); border-radius: 11px; padding: 13px 15px;
  background: var(--paper); font-size: 15px; display: flex; gap: 11px; align-items: flex-start;
  transition: border-color .15s, background .15s;
}
.answers li:not(.locked):hover { border-color: var(--amber); }
.answers li .k { font-family: var(--mono); font-weight: 700; color: var(--ink-soft); }
.answers li.correct { border-color: var(--green); background: var(--green-soft); }
.answers li.correct .k { color: var(--green); }
.answers li.wrong { border-color: var(--red); background: var(--red-soft); }
.answers li.wrong .k { color: var(--red); }
.answers li.locked { cursor: default; }

.confidence {
  margin-top: 16px; padding: 14px; border: 1px dashed var(--green);
  border-radius: 11px; background: var(--green-soft);
}
.confidence .ct { font-size: 14px; font-weight: 700; color: var(--green); margin-bottom: 10px; }
.conf-btns { display: flex; gap: 10px; }
.cbtn { flex: 1; padding: 12px; border-radius: 10px; font-size: 14px; font-weight: 700;
  border: 1px solid var(--line); background: var(--card); color: var(--ink); }
.cbtn.yes { border-color: var(--green); color: var(--green); }
.cbtn.no { border-color: var(--amber); color: var(--amber); }
.cbtn:active { transform: translateY(1px); }

.next {
  margin-top: 16px; width: 100%; padding: 14px; border: 0; border-radius: 11px;
  background: var(--ink); color: var(--paper); font-weight: 700; font-size: 15px;
}
.next:active { transform: translateY(1px); }

.expert { margin-top: 14px; font-size: 14px; color: var(--ink-soft); }
.expert summary { cursor: pointer; font-weight: 600; color: var(--blue); }
.expert #expert { margin-top: 8px; line-height: 1.55; white-space: pre-wrap; }

.done { text-align: center; padding: 50px 20px; }
.done-emoji { font-size: 56px; }
.done h2 { margin: 12px 0 6px; }
.done p { color: var(--ink-soft); margin: 0 0 20px; }

.foot { text-align: center; margin-top: 22px; }
.link { background: none; border: 0; color: var(--ink-soft); font-size: 13px; text-decoration: underline; }
.link:hover { color: var(--red); }

/* ---------- ШТОРКА РАЗДЕЛОВ ---------- */
.sheet { position: fixed; inset: 0; z-index: 20; background: rgba(0,0,0,.4);
  display: flex; align-items: flex-end; justify-content: center; }
.sheet-box {
  background: var(--card); width: 100%; max-width: 560px; max-height: 85vh; overflow-y: auto;
  border-radius: 18px 18px 0 0; padding: 20px 18px calc(24px + env(safe-area-inset-bottom));
  box-shadow: var(--shadow);
}
.sheet-head { display: flex; justify-content: space-between; align-items: center; }
.sheet-head h3 { margin: 0; font-size: 18px; }
.sheet-head .ghost { border: 0; background: none; font-size: 18px; color: var(--ink-soft); }
.sheet-sub { color: var(--ink-soft); font-size: 13px; margin: 6px 0 16px; }
.srow {
  display: grid; grid-template-columns: 1fr auto; gap: 4px 12px; align-items: center;
  padding: 11px 0; border-bottom: 1px solid var(--line);
}
.srow .sname { font-size: 14px; font-weight: 600; }
.srow .sbar { grid-column: 1 / -1; height: 6px; background: var(--line); border-radius: 3px; overflow: hidden; }
.srow .sbar > i { display: block; height: 100%; }
.srow .sacc { font-family: var(--mono); font-size: 13px; font-weight: 700; font-variant-numeric: tabular-nums; }
.srow .smeta { grid-column: 1 / -1; font-size: 11px; color: var(--ink-soft); font-family: var(--mono); }
.srow.weak .sname::before { content: "⚠ "; }

@media (min-width: 560px) {
  .stat .v { font-size: 26px; }
  .stat .l { font-size: 11px; }
  .sheet { align-items: center; }
  .sheet-box { border-radius: 18px; }
}