:root {
  color-scheme: only light;
  --sje-primary: #034ea2;
  --sje-primary-hover: #063e80;
  --sje-primary-deep: #0b2c5f;
  --sje-primary-soft: #eaf3ff;
  --sje-brand-yellow: #ffc20f;
  --sje-brand-yellow-soft: #fff8d6;
  --sje-accent: #fcd34d;
  --sje-accent-soft: #fef3c7;
  --sje-ok: #137a3c;
  --sje-ok-soft: #edf9f1;
  --sje-review: #a44b00;
  --sje-review-soft: #fff4e5;
  --sje-learning: #6941c6;
  --sje-learning-soft: #f4f0ff;
  --sje-danger: #b42318;
  --sje-danger-soft: #fff1f0;
  --sje-ink: #10243e;
  --sje-ink-soft: #344b64;
  --sje-muted: #5a6d82;
  --sje-bg: #f3f6fb;
  --sje-surface: #ffffff;
  --sje-line: #d5e0ec;
  --sje-line-strong: #afc2d7;
  --sje-shadow-sm: 0 5px 18px rgba(20, 46, 78, .07);
  --sje-shadow-md: 0 22px 54px rgba(13, 38, 69, .2);
  --sje-radius-sm: 12px;
  --sje-radius: 18px;
  --sje-radius-lg: 24px;
  --sje-focus: 0 0 0 3px rgba(252, 211, 77, .85), 0 0 0 5px rgba(3, 78, 162, .42);
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-behavior: smooth; }
body {
  min-width: 320px;
  margin: 0;
  color: var(--sje-ink);
  background:
    radial-gradient(circle at 92% 5%, rgba(3, 78, 162, .08), transparent 25rem),
    linear-gradient(180deg, #f8faff 0, var(--sje-bg) 31rem);
  font-family: Roboto, system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}
body.modal-open { overflow: hidden; }
button, input { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
.wrap { width: 100%; max-width: 1160px; margin: 0 auto; padding-inline: 18px; }
.reading-wrap { max-width: 980px; }
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 10px 14px;
  color: #fff;
  background: var(--sje-primary-deep);
  border-radius: 10px;
  font-weight: 800;
  text-decoration: none;
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }
main[tabindex="-1"]:focus { outline: none; box-shadow: none; }

/* One public learning shell for vocabulary and grammar. */
.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(255, 255, 255, .94);
  border-bottom: 1px solid rgba(213, 224, 236, .88);
  backdrop-filter: blur(16px);
}
.site-header .wrap {
  display: grid;
  min-height: 70px;
  grid-template-columns: minmax(0, 1fr) auto;
  grid-template-areas: "brand login" "nav nav";
  align-items: center;
  gap: 0 14px;
  padding-top: env(safe-area-inset-top);
}
.wordmark {
  grid-area: brand;
  display: inline-flex;
  width: fit-content;
  min-height: 46px;
  align-items: center;
  gap: 9px;
  color: var(--sje-primary);
  font-size: 19px;
  font-weight: 850;
  letter-spacing: -.03em;
  text-decoration: none;
}
.wordmark .dot {
  width: 13px;
  height: 13px;
  flex: none;
  border-radius: 50%;
  background: var(--sje-brand-yellow);
  box-shadow: 0 0 0 5px var(--sje-brand-yellow-soft);
}
.learning-nav {
  grid-area: nav;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px;
  margin-bottom: 8px;
  padding: 4px;
  background: #edf3fa;
  border-radius: 12px;
}
.learning-nav a {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 8px 12px;
  color: var(--sje-muted);
  border: 1px solid transparent;
  border-radius: 9px;
  font-size: 13px;
  font-weight: 800;
  text-decoration: none;
  white-space: nowrap;
}
.learning-nav a:hover { color: var(--sje-primary-deep); }
.learning-nav a[aria-current="page"] {
  color: var(--sje-primary-deep);
  background: #fff;
  border-color: #d8e4f0;
  box-shadow: 0 2px 7px rgba(17, 47, 82, .08);
}
.learning-nav-icon { color: var(--sje-primary); font-size: 15px; line-height: 1; }
.btn, .btn-login {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  border: 2px solid transparent;
  border-radius: 12px;
  padding: 10px 18px;
  color: inherit;
  font-size: 14px;
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  cursor: pointer;
  transition: transform .16s ease, box-shadow .16s ease, background-color .16s ease, border-color .16s ease;
}
.btn-login {
  grid-area: login;
  justify-self: end;
  min-height: 42px;
  padding: 8px 14px;
  color: var(--sje-primary);
  background: #fff;
  border-color: #b9cbe0;
}
.btn-primary { color: #fff; background: var(--sje-primary); box-shadow: 0 8px 18px rgba(3, 78, 162, .2); }
.btn-primary:hover { background: var(--sje-primary-hover); }
.btn-ghost { color: var(--sje-primary); background: #fff; border-color: var(--sje-line-strong); }
.btn-ghost:hover, .btn-login:hover { color: var(--sje-primary-deep); background: var(--sje-primary-soft); border-color: var(--sje-primary); }
.btn:active, .btn-login:active { transform: translateY(1px); }
.btn:disabled { opacity: .52; cursor: not-allowed; box-shadow: none; }

.crumbs { padding-top: 14px; color: var(--sje-muted); font-size: 12px; overflow-wrap: anywhere; }
.crumbs a {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  margin-inline: -5px;
  padding-inline: 5px;
  color: var(--sje-muted);
  text-underline-offset: 3px;
}
.crumbs a:hover { color: var(--sje-primary); }
.page-hero { padding: 16px 0 14px; }
.hero-kicker, .session-eyebrow {
  margin: 0;
  color: var(--sje-primary);
  font-size: 11px;
  font-weight: 900;
  letter-spacing: .105em;
  text-transform: uppercase;
}
.page-hero h1 {
  max-width: 800px;
  margin: 7px 0 0;
  color: var(--sje-ink);
  font-size: clamp(30px, 7vw, 48px);
  line-height: 1.08;
  letter-spacing: -.045em;
  text-wrap: balance;
  overflow-wrap: anywhere;
}
.page-hero > p:not(.hero-kicker), .hero-copy {
  max-width: 760px;
  margin: 11px 0 0;
  color: var(--sje-muted);
  font-size: 15px;
  line-height: 1.65;
}

/* Shared cards keep hierarchy and interaction consistent across both libraries. */
.level-grid { display: grid; grid-template-columns: 1fr; gap: 12px; margin: 18px 0 48px; }
.level-card {
  position: relative;
  display: flex;
  min-width: 0;
  min-height: 205px;
  flex-direction: column;
  overflow: hidden;
  padding: 20px;
  color: inherit;
  text-decoration: none;
  background: var(--sje-surface);
  border: 1px solid var(--sje-line);
  border-radius: var(--sje-radius);
  box-shadow: var(--sje-shadow-sm);
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
}
.level-card::before { position: absolute; inset: 0 auto 0 0; width: 5px; background: var(--level-accent, var(--sje-primary)); content: ""; }
.level-card:hover { border-color: #86acd6; box-shadow: 0 14px 32px rgba(15, 38, 71, .12); transform: translateY(-2px); }
.level-card h2 { margin: 0; color: var(--sje-ink); font-size: 19px; line-height: 1.25; letter-spacing: -.02em; }
.level-card p { margin: 7px 0 0; color: var(--sje-muted); font-size: 13px; line-height: 1.55; }
.level-code {
  display: inline-flex;
  width: fit-content;
  min-width: 48px;
  min-height: 32px;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
  padding: 5px 10px;
  color: var(--level-accent, var(--sje-primary));
  background: var(--level-soft, var(--sje-primary-soft));
  border-radius: 9px;
  font-size: 14px;
  font-weight: 900;
}
.level-card-cta { display: inline-flex; align-items: center; gap: 5px; margin-top: auto; padding-top: 14px; color: var(--sje-primary); font-size: 13px; font-weight: 850; }
.badge-count { display: inline-flex; width: fit-content; min-height: 28px; align-items: center; margin-top: 12px; padding: 4px 10px; color: var(--sje-primary); background: var(--sje-primary-soft); border-radius: 999px; font-size: 12px; font-weight: 800; }
.level-a1 { --level-accent: #16855b; --level-soft: #e9f8f2; }
.level-a2 { --level-accent: #087c97; --level-soft: #e9f8fb; }
.level-b1 { --level-accent: var(--sje-primary); --level-soft: var(--sje-primary-soft); }
.level-b2 { --level-accent: #6744b8; --level-soft: #f2effb; }
.level-c1 { --level-accent: #a34665; --level-soft: #fbeff3; }

.progress-panel { margin: 16px 0; padding: 17px 18px; background: #fff; border: 1px solid var(--sje-line); border-radius: var(--sje-radius); box-shadow: var(--sje-shadow-sm); }
.progress-panel h2 { margin: 0; color: var(--sje-ink); font-size: 16px; }
.progress-copy { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.progress-line { display: flex; align-items: center; gap: 10px; margin: 12px 0 4px; }
.progress-track { height: 10px; flex: 1; overflow: hidden; background: #e2eaf3; border-radius: 999px; }
.progress-fill { width: 0; height: 100%; background: linear-gradient(90deg, var(--sje-primary), #168dcc); border-radius: inherit; transition: width .28s ease; }
.progress-text { color: var(--sje-muted); font-size: 13px; font-weight: 750; white-space: nowrap; }

/* Shared focused practice workspace. */
.practice-overlay {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: none;
  width: 100%;
  height: 100%;
  align-items: stretch;
  justify-content: center;
  padding-top: env(safe-area-inset-top);
  background: rgba(7, 25, 50, .72);
  backdrop-filter: blur(6px);
}
.practice-overlay.open { display: flex; }
.practice-sheet {
  width: 100%;
  max-width: 720px;
  min-height: 100dvh;
  max-height: 100dvh;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 16px 18px calc(18px + env(safe-area-inset-bottom));
  background: #f8faff;
  box-shadow: var(--sje-shadow-md);
}
.practice-topbar { display: flex; min-height: 48px; align-items: center; justify-content: space-between; gap: 14px; }
.practice-step { color: var(--sje-primary); font-size: 11px; font-weight: 900; letter-spacing: .07em; line-height: 1.35; text-transform: uppercase; }
.practice-close {
  display: inline-flex;
  width: 44px;
  height: 44px;
  flex: 0 0 44px;
  align-items: center;
  justify-content: center;
  color: var(--sje-muted);
  background: #fff;
  border: 1px solid var(--sje-line);
  border-radius: 50%;
  font-size: 22px;
  line-height: 1;
  cursor: pointer;
}
.practice-close:hover { color: var(--sje-primary); background: var(--sje-primary-soft); border-color: #86acd6; }
.practice-progress { height: 8px; overflow: hidden; margin: 4px 0 22px; background: #dfe9f4; border-radius: 999px; }
.practice-progress > span { display: block; width: var(--practice-progress, 0%); height: 100%; background: linear-gradient(90deg, var(--sje-primary), #168dcc); border-radius: inherit; transition: width .25s ease; }
.practice-stage {
  min-height: 380px;
  padding: clamp(20px, 5vw, 34px);
  background: #fff;
  border: 1px solid var(--sje-line);
  border-radius: var(--sje-radius-lg);
  box-shadow: var(--sje-shadow-sm);
}
.practice-instruction { margin: 0 0 8px; color: var(--sje-muted); font-size: 12px; font-weight: 850; letter-spacing: .06em; text-transform: uppercase; }
.practice-question { margin: 0; color: var(--sje-ink); font-family: Georgia, "Times New Roman", serif; font-size: clamp(21px, 5vw, 30px); font-weight: 700; line-height: 1.42; letter-spacing: -.018em; text-wrap: balance; }
.practice-options { display: grid; gap: 10px; margin-top: 24px; }
.practice-option {
  display: grid;
  width: 100%;
  min-height: 58px;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  color: var(--sje-ink);
  text-align: left;
  background: #fff;
  border: 2px solid var(--sje-line);
  border-radius: 14px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: border-color .14s ease, background-color .14s ease, transform .14s ease;
}
.practice-option:hover:not(:disabled):not([aria-disabled="true"]) { border-color: #75a4d6; transform: translateY(-1px); }
.practice-option:disabled, .practice-option[aria-disabled="true"] { cursor: default; }
.practice-option.correct { color: #0b5d2b; background: var(--sje-ok-soft); border-color: #4fa875; }
.practice-option.wrong { color: #8f1e18; background: var(--sje-danger-soft); border-color: #dc766f; }
.option-marker {
  display: inline-flex;
  width: 32px;
  height: 32px;
  align-items: center;
  justify-content: center;
  color: var(--sje-primary);
  background: var(--sje-primary-soft);
  border-radius: 9px;
  font-size: 12px;
  font-weight: 900;
}
.correct .option-marker { color: #fff; background: var(--sje-ok); }
.wrong .option-marker { color: #fff; background: var(--sje-danger); }
.practice-feedback {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 11px;
  margin-top: 18px;
  padding: 15px;
  color: var(--sje-ink-soft);
  background: #f3f7fb;
  border: 1px solid var(--sje-line);
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.55;
}
.practice-feedback.ok { background: var(--sje-ok-soft); border-color: #92d0a7; }
.practice-feedback.bad { background: var(--sje-danger-soft); border-color: #efaaa5; }
.feedback-icon { display: inline-flex; width: 28px; height: 28px; align-items: center; justify-content: center; color: #fff; background: var(--sje-primary); border-radius: 50%; font-weight: 900; }
.practice-feedback.ok .feedback-icon { background: var(--sje-ok); }
.practice-feedback.bad .feedback-icon { background: var(--sje-danger); }
.practice-feedback strong { display: block; color: var(--sje-ink); font-size: 15px; }
.practice-feedback p { margin: 3px 0 0; }
.practice-feedback .feedback-next { grid-column: 1 / -1; margin-top: 3px; }
.practice-actions { display: flex; gap: 10px; margin-top: 16px; }
.practice-actions .btn { flex: 1; }

:where(a, button, input, [tabindex]):focus-visible { outline: 2px solid transparent; box-shadow: var(--sje-focus); }
.level-card:focus-visible, .practice-option:focus-visible { z-index: 2; border-color: var(--sje-primary); }
.site-footer { margin-top: 26px; padding: 28px 0 calc(28px + env(safe-area-inset-bottom)); background: #fff; border-top: 1px solid var(--sje-line); }
.site-footer .wrap { color: var(--sje-muted); font-size: 13px; }
.site-footer a { display: inline-flex; min-height: 44px; align-items: center; color: var(--sje-primary); text-underline-offset: 3px; }

@media (min-width: 620px) {
  .wrap { padding-inline: 24px; }
  .site-header .wrap { grid-template-columns: auto minmax(260px, 360px) 1fr; grid-template-areas: "brand nav login"; gap: 24px; }
  .learning-nav { margin: 0; }
  .btn-login { justify-self: end; }
  .level-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 15px; }
  .practice-overlay { align-items: center; padding: 26px; }
  .practice-sheet { min-height: 0; max-height: min(92dvh, 820px); padding: 20px 24px 24px; border-radius: 26px; }
}

@media (min-width: 900px) {
  .level-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .page-hero { padding-top: 22px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    scroll-behavior: auto !important;
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
}