:root {
  --bg: #f7f7f5;
  --card: #ffffff;
  --ink: #14161a;
  --muted: #6b7280;
  --line: #e5e7eb;
  --accent: #2f6df6;
  --accent-ink: #ffffff;
  --ok: #1f9d63;
  --bad: #d24545;
  --warn: #b8860b;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 22, 26, .06), 0 8px 24px rgba(20, 22, 26, .06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

/* ---------------------------------------------------------------- шапка */

.top {
  display: flex;
  align-items: center;
  gap: 22px;
  padding: 14px 22px;
  background: rgba(255, 255, 255, .85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  z-index: 10;
}

.logo {
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -.02em;
  text-decoration: none;
}

.nav { display: flex; gap: 18px; margin-right: auto; }
.nav a { color: var(--muted); text-decoration: none; font-size: 15px; }
.nav a:hover { color: var(--ink); }

.auth-box { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.auth-box .who { color: var(--muted); }

/* ---------------------------------------------------------------- каркас */

.view { max-width: 880px; margin: 0 auto; padding: 30px 22px 60px; }

.hero { padding: 26px 0 10px; }
.hero h1 { font-size: 34px; line-height: 1.15; letter-spacing: -.02em; margin: 0 0 12px; }
.hero p { color: var(--muted); font-size: 17px; max-width: 56ch; margin: 0 0 20px; }

h2 { font-size: 21px; letter-spacing: -.01em; margin: 34px 0 14px; display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
h2:first-child { margin-top: 0; }
h2 .count { font-size: 14px; font-weight: 400; color: var(--muted); }

.foot {
  max-width: 880px;
  margin: 0 auto;
  padding: 20px 22px 40px;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  font-size: 13px;
  border-top: 1px solid var(--line);
}

/* ---------------------------------------------------------------- кнопки */

button, .btn {
  font: inherit;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  padding: 9px 16px;
  border-radius: 10px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: transform .06s ease, background .15s ease, border-color .15s ease;
}
button:hover, .btn:hover { border-color: #cfd4dc; }
button:active, .btn:active { transform: translateY(1px); }

.btn-primary, button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
  font-weight: 600;
}
.btn-primary:hover, button.primary:hover { background: #245bd8; border-color: #245bd8; }

button:disabled { opacity: .5; cursor: default; }
button.ghost { background: transparent; border-color: transparent; color: var(--muted); }

/* ---------------------------------------------------------------- карточки */

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}

.lessons { display: grid; gap: 12px; }

.lesson-row {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 15px 18px;
  text-decoration: none;
  transition: border-color .15s ease, transform .08s ease;
}
.lesson-row:hover { border-color: #cdd3dd; transform: translateY(-1px); }
.lesson-row .meta { flex: 1; min-width: 0; }
.lesson-row .title { display: block; font-weight: 600; margin-bottom: 2px; }
.lesson-row .sub { display: block; color: var(--muted); font-size: 14px; }
.lesson-row.locked { opacity: .72; }
.lesson-row.passed .title { color: var(--ok); }

.level {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .04em;
  padding: 3px 8px;
  border-radius: 6px;
  background: #eef2ff;
  color: #3b4fd8;
}

.bar { width: 92px; height: 6px; background: var(--line); border-radius: 99px; overflow: hidden; }
.bar > i { display: block; height: 100%; background: var(--ok); }

.tag {
  font-size: 12px;
  padding: 3px 8px;
  border-radius: 6px;
  background: #fff4e0;
  color: var(--warn);
  white-space: nowrap;
}

/* ---------------------------------------------------------------- урок */

.crumbs { color: var(--muted); font-size: 14px; margin-bottom: 14px; }
.crumbs a { text-decoration: none; }
.crumbs a:hover { text-decoration: underline; }

.ex { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; margin-bottom: 14px; }
.ex .q { font-size: 17px; font-weight: 600; margin-bottom: 4px; }
.ex .hint { color: var(--muted); font-size: 14px; margin-bottom: 14px; }

.opts { display: grid; gap: 9px; }
.opt {
  text-align: left;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--card);
  cursor: pointer;
  font: inherit;
  width: 100%;
}
.opt:hover:not(:disabled) { border-color: #b9c2d0; }
.opt.picked { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.opt.good { border-color: var(--ok); background: #f0fbf5; }
.opt.bad { border-color: var(--bad); background: #fdf2f2; }

input[type=text], input[type=email], input[type=password] {
  font: inherit;
  width: 100%;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
}
input:focus { outline: 2px solid rgba(47, 109, 246, .25); border-color: var(--accent); }

.row { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

.feedback { margin-top: 13px; padding: 12px 14px; border-radius: 10px; font-size: 15px; }
.feedback.good { background: #f0fbf5; color: #14663f; }
.feedback.bad { background: #fdf2f2; color: #8f2b2b; }
.feedback b { font-weight: 600; }

.match-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.match-col { display: grid; gap: 8px; }
.chip {
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--card);
  cursor: pointer;
  font: inherit;
  text-align: left;
}
.chip.picked { border-color: var(--accent); box-shadow: inset 0 0 0 1px var(--accent); }
.chip.done { border-color: var(--ok); background: #f0fbf5; color: #14663f; cursor: default; }

/* ---------------------------------------------------------------- тарифы */

.plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; }
.plan { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 20px; display: flex; flex-direction: column; gap: 8px; position: relative; }
.plan h3 { margin: 0; font-size: 17px; }
.plan .price { font-size: 28px; font-weight: 700; letter-spacing: -.02em; }
.plan .per { color: var(--muted); font-size: 14px; }
.plan .badge { position: absolute; top: -10px; right: 14px; background: var(--accent); color: #fff; font-size: 12px; padding: 3px 9px; border-radius: 99px; }
.plan ul { margin: 4px 0 10px; padding-left: 18px; color: var(--muted); font-size: 14px; }
.plan button { margin-top: auto; }

/* ---------------------------------------------------------------- прочее */

.modal-back { position: fixed; inset: 0; background: rgba(20,22,26,.45); display: flex; align-items: center; justify-content: center; padding: 20px; z-index: 50; }
.modal { background: var(--card); border-radius: var(--radius); padding: 24px; width: 100%; max-width: 380px; box-shadow: var(--shadow); }
.modal h3 { margin: 0 0 14px; }
.modal .field { margin-bottom: 12px; }
.modal .err { color: var(--bad); font-size: 14px; min-height: 20px; }

.center { text-align: center; }
.muted { color: var(--muted); }
.empty { padding: 40px 20px; text-align: center; color: var(--muted); }

@media (max-width: 620px) {
  .hero h1 { font-size: 27px; }
  .match-grid { grid-template-columns: 1fr; }
  .top { gap: 12px; padding: 12px 14px; }
  .view { padding: 20px 14px 50px; }
}