/* LINGUAPHIX — Site global */
:root {
  color-scheme: light;
  --site-bg: #faf9f7;
  --site-surface: #ffffff;
  --site-text: #1a1a1a;
  --site-muted: #5f5e5a;
  --site-border: #e8e6e1;
  --site-accent: #1a3c2e;
  --site-accent-light: #0f6e56;
  --site-accent-solid: #1a3c2e;
  --site-fle: #1a3c2e;
  --site-esl: #185fa5;
  --site-esl-solid: #185fa5;
  --site-radius: 12px;
  --site-max: 960px;
  --site-nav-h: 56px;
  --font-sans: "Segoe UI", system-ui, -apple-system, sans-serif;

  --site-elevated: #f8f8f8;
  --site-inset: #f4f8f6;
  --site-highlight: #f8fcfa;
  --site-accent-soft: #f0f7f4;
  --site-on-accent: #ffffff;
  --site-shadow: rgba(0, 0, 0, 0.08);
  --site-shadow-sm: rgba(0, 0, 0, 0.06);

  --state-ok-bg: #e1f5ee;
  --state-ok-text: #0f6e56;
  --state-ok-border: #5dcaa5;
  --state-info-bg: #e6f1fb;
  --state-info-text: #185fa5;
  --state-info-border: #85b7eb;
  --state-error-bg: #fcebeb;
  --state-error-text: #a32d2d;
  --state-error-border: #f09595;
  --state-warn-border: #c8870a;
  --state-review-bg: #fbeaf0;
  --state-review-text: #993556;
  --state-review-border: #ed93b1;

  --badge-fle-bg: #e1f5ee;
  --badge-fle-text: #0f6e56;
  --badge-esl-bg: #e6f1fb;
  --badge-esl-text: #185fa5;

  --lv-a1: #1a3c2e;
  --lv-a2: #185fa5;
  --lv-b1: #854f0b;
  --lv-b2: #993c1d;
  --lv-c1: #534ab7;
  --lv-c2: #5f5e5a;

  --cat-teal-bg: #e1f5ee;
  --cat-teal-text: #0f6e56;
  --cat-teal-border: #5dcaa5;
  --cat-blue-bg: #e6f1fb;
  --cat-blue-text: #185fa5;
  --cat-blue-border: #85b7eb;
  --cat-amber-bg: #faeeda;
  --cat-amber-text: #854f0b;
  --cat-amber-border: #ef9f27;
  --cat-purple-bg: #eeedfe;
  --cat-purple-text: #534ab7;
  --cat-purple-border: #afa9ec;
  --cat-pink-bg: #fbeaf0;
  --cat-pink-text: #993556;
  --cat-pink-border: #ed93b1;
  --cat-coral-bg: #faece7;
  --cat-coral-text: #993c1d;
  --cat-coral-border: #f0997b;
  --cat-gray-bg: #f1efe8;
  --cat-gray-text: #5f5e5a;
  --cat-gray-border: #b4b2a9;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--site-bg);
  color: var(--site-text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Navigation ── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--site-nav-h);
  background: var(--site-surface);
  border-bottom: 1px solid var(--site-border);
  display: flex;
  align-items: center;
  padding: 0 20px;
  gap: 24px;
}
.site-nav-inner {
  max-width: var(--site-max);
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 24px;
}
.site-logo {
  font-weight: 700;
  font-size: 18px;
  color: var(--site-accent);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.site-logo span { color: var(--site-muted); font-weight: 400; font-size: 13px; margin-left: 8px; }
.site-links { display: flex; gap: 4px; margin-left: auto; }
.site-links a {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  color: var(--site-muted);
  transition: background .15s, color .15s;
}
.site-links a:hover { background: var(--site-bg); color: var(--site-text); }
.site-links a.active { background: var(--site-accent-solid); color: var(--site-on-accent); }
.site-links a.active.esl { background: var(--site-esl-solid); }

/* ── Main ── */
.site-main { flex: 1; }
.site-container { max-width: var(--site-max); margin: 0 auto; padding: 24px 20px 48px; }

/* ── Landing hero ── */
.hero { text-align: center; padding: 48px 0 32px; }
.site-back-main {
  margin: 0 0 8px;
  text-align: left;
}
.site-back-main a {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 13px;
  font-weight: 600;
  color: var(--site-accent-light);
  text-decoration: none;
}
.site-back-main a:hover {
  color: var(--site-accent);
  text-decoration: underline;
}
.hero h1 { font-size: clamp(28px, 5vw, 40px); font-weight: 700; margin: 0 0 12px; letter-spacing: -0.03em; }
.hero p { font-size: 16px; color: var(--site-muted); max-width: 560px; margin: 0 auto 32px; }
.hero-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 20px; max-width: 720px; margin: 0 auto; }
.hero-card {
  display: block;
  padding: 28px 24px;
  border-radius: var(--site-radius);
  border: 1px solid var(--site-border);
  background: var(--site-surface);
  text-decoration: none;
  color: inherit;
  text-align: left;
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.hero-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px var(--site-shadow); }
.hero-card.fle:hover { border-color: var(--site-fle); }
.hero-card.esl:hover { border-color: var(--site-esl); }
.hero-card-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: 4px 10px;
  border-radius: 20px;
  margin-bottom: 12px;
}
.hero-card.fle .hero-card-badge { background: var(--badge-fle-bg); color: var(--badge-fle-text); }
.hero-card.esl .hero-card-badge { background: var(--badge-esl-bg); color: var(--badge-esl-text); }
.hero-card h2 { font-size: 20px; margin: 0 0 8px; }
.hero-card p { font-size: 13px; color: var(--site-muted); margin: 0 0 16px; line-height: 1.6; }
.hero-card-meta { font-size: 12px; color: var(--site-muted); display: flex; flex-wrap: wrap; gap: 8px; }
.hero-card-meta span { background: var(--site-bg); padding: 3px 8px; border-radius: 6px; }

/* ── Features strip ── */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--site-border);
}
.feature { padding: 16px; }
.feature-icon { font-size: 24px; margin-bottom: 8px; }
.feature h3 { font-size: 14px; margin: 0 0 4px; }
.feature p { font-size: 12px; color: var(--site-muted); margin: 0; }

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--site-border);
  padding: 20px;
  text-align: center;
  font-size: 12px;
  color: var(--site-muted);
  background: var(--site-surface);
}
.site-footer a { color: var(--site-accent-light); }

/* ── Platform page wrapper ── */
.page-intro { margin-bottom: 8px; }
.page-intro h1 { font-size: 22px; margin: 0 0 4px; }
.page-intro p { font-size: 13px; color: var(--site-muted); margin: 0; }

/* ── Enhanced précis (grammar-platform additions) ── */
.lp-precis-wrap { display: flex; flex-direction: column; gap: 16px; }
.lp-precis-section {
  border: 1px solid var(--site-border);
  border-radius: 10px;
  overflow: hidden;
  background: var(--site-surface);
}
.lp-precis-section-head {
  padding: 10px 14px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  background: var(--site-bg);
  border-bottom: 1px solid var(--site-border);
}
.lp-precis-section-body {
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.85;
  white-space: pre-wrap;
}
.lp-points { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.lp-points-hint { font-size: 12px; color: var(--site-muted); margin: -6px 0 10px; line-height: 1.5; }
.lp-point-chip {
  font-size: 12px; padding: 4px 10px; border-radius: 20px; border: 1px solid;
  cursor: pointer; font-family: inherit; transition: opacity .15s, transform .15s;
}
.lp-point-chip:hover { opacity: .85; transform: translateY(-1px); }
.lp-points-detail { display: flex; flex-direction: column; gap: 10px; margin-bottom: 16px; }
.lp-point-block {
  padding: 12px 14px; border: 1px solid var(--site-border);
  border-radius: 8px; background: var(--site-bg); scroll-margin-top: 80px;
}
.lp-point-block.lp-point-highlight {
  box-shadow: 0 0 0 2px var(--site-accent-light);
  border-color: var(--site-accent);
  background: var(--site-highlight);
}
.lp-point-block-title { font-size: 14px; font-weight: 600; margin-bottom: 10px; color: var(--site-text); }
.lp-point-block-body { font-size: 13px; line-height: 1.7; color: var(--site-text); }
.lp-point-subhead {
  font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: .04em;
  color: var(--site-accent); margin: 12px 0 6px;
}
.lp-point-subhead:first-child { margin-top: 0; }
.lp-point-formation-line {
  font-family: ui-monospace, "Cascadia Code", Consolas, monospace;
  font-size: 12px;
  padding: 3px 10px;
  margin: 2px 0;
  background: var(--site-inset);
  border-radius: 4px;
  color: var(--site-text);
  line-height: 1.6;
}
.lp-point-p { margin: 0 0 8px; color: var(--site-text); }
.lp-point-bullet {
  position: relative; padding-left: 14px; margin-bottom: 6px; color: var(--site-muted);
}
.lp-point-bullet::before {
  content: "•"; position: absolute; left: 0; color: var(--site-accent); font-weight: 700;
}
.lp-point-example {
  margin: 4px 0 8px 14px; padding: 8px 10px;
  background: var(--site-accent-soft); border-radius: 6px; font-size: 12px; color: var(--site-muted);
  border-left: 2px solid var(--site-accent-light);
}
.lp-cefr-box {
  padding: 12px 14px;
  background: var(--site-accent-soft);
  border-left: 3px solid var(--site-accent);
  border-radius: 0 8px 8px 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--site-muted);
}
.lp-cefr-box strong { color: var(--site-text); }

/* ── Précis thematic search ── */
.lp-precis-search {
  margin-bottom: 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid var(--site-border);
}
.lp-precis-search-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 10px;
}
.lp-precis-search-input {
  flex: 1;
  min-width: 0;
  padding: 10px 14px;
  font-size: 14px;
  font-family: inherit;
  border: 1px solid var(--site-border);
  border-radius: 8px;
  background: var(--site-bg);
  color: var(--site-text);
}
.lp-precis-search-input:focus {
  outline: none;
  border-color: var(--site-accent);
  box-shadow: 0 0 0 2px var(--site-accent-light);
}
.lp-precis-search-clear {
  flex-shrink: 0;
  padding: 8px 12px;
  font-size: 12px;
  font-family: inherit;
  border: 1px solid var(--site-border);
  border-radius: 8px;
  background: var(--site-surface);
  color: var(--site-muted);
  cursor: pointer;
}
.lp-precis-search-clear:hover { color: var(--site-text); border-color: var(--site-accent); }
.lp-precis-search-meta {
  font-size: 12px;
  font-weight: 600;
  color: var(--site-accent);
  margin-bottom: 8px;
}
.lp-precis-search-empty {
  font-size: 13px;
  color: var(--site-muted);
  margin: 0;
}
.lp-precis-search-results {
  display: flex;
  flex-direction: column;
  gap: 8px;
  max-height: 320px;
  overflow-y: auto;
  padding-right: 4px;
}
.lp-precis-search-hit {
  display: flex;
  flex-direction: column;
  gap: 4px;
  width: 100%;
  text-align: left;
  padding: 10px 12px;
  border: 1px solid var(--site-border);
  border-left-width: 3px;
  border-radius: 8px;
  background: var(--site-bg);
  cursor: pointer;
  font-family: inherit;
  transition: background .15s, box-shadow .15s;
}
.lp-precis-search-hit:hover {
  background: var(--site-highlight);
  box-shadow: 0 2px 8px var(--site-shadow-sm);
}
.lp-precis-search-hit-top {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  align-items: center;
}
.lp-precis-search-lv {
  font-size: 10px;
  font-weight: 700;
  color: var(--site-on-accent);
  padding: 2px 7px;
  border-radius: 4px;
  letter-spacing: .03em;
}
.lp-precis-search-cat { font-size: 11px; font-weight: 600; }
.lp-precis-search-hit-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--site-text);
  line-height: 1.4;
}
.lp-precis-search-hit-snippet {
  font-size: 12px;
  color: var(--site-muted);
  line-height: 1.5;
}

/* ── Flashcard MCQ ── */
.lp-fc-question { font-size: 16px; font-weight: 500; margin-bottom: 14px; line-height: 1.5; }
.lp-fc-options { display: flex; flex-direction: column; gap: 8px; margin-bottom: 12px; }
.lp-fc-opt {
  padding: 10px 14px;
  border-radius: 8px;
  border: 1px solid var(--site-border);
  background: var(--site-bg);
  font-size: 13px;
  cursor: pointer;
  text-align: left;
  transition: all .15s;
}
.lp-fc-opt:hover:not(.lp-fc-opt-locked) { border-color: var(--site-accent); background: var(--state-ok-bg); }
.lp-fc-opt.lp-selected { border-color: var(--state-info-border); background: var(--state-info-bg); color: var(--state-info-text); }
.lp-fc-opt.lp-ok { border-color: var(--state-ok-border); background: var(--state-ok-bg); color: var(--state-ok-text); }
.lp-fc-opt.lp-ko { border-color: var(--state-error-border); background: var(--state-error-bg); color: var(--state-error-text); }
.lp-fc-opt-locked { cursor: default; }
.lp-fc-back {
  margin-top: 12px;
  padding: 12px 14px;
  background: var(--state-ok-bg);
  border-radius: 8px;
  font-size: 13px;
  line-height: 1.7;
  text-align: left;
}

/* ── Category & level tones (platform) — see grammar-platform.css ── */

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --site-bg: #121212;
    --site-surface: #1a1a1a;
    --site-text: #e8e8e8;
    --site-muted: #a8a8a8;
    --site-border: #333333;
    --site-accent: #9fe1cb;
    --site-accent-light: #5dcaa5;
    --site-accent-solid: #0f6e56;
    --site-fle: #9fe1cb;
    --site-esl: #b5d4f4;
    --site-esl-solid: #185fa5;

    --site-elevated: #222222;
    --site-inset: #1e2420;
    --site-highlight: #1a2822;
    --site-accent-soft: #152820;
    --site-on-accent: #ffffff;
    --site-shadow: rgba(0, 0, 0, 0.35);
    --site-shadow-sm: rgba(0, 0, 0, 0.25);

    --state-ok-bg: #0d2818;
    --state-ok-text: #9fe1cb;
    --state-ok-border: #2a6b52;
    --state-info-bg: #0a2438;
    --state-info-text: #b5d4f4;
    --state-info-border: #3a6a9a;
    --state-error-bg: #3a1515;
    --state-error-text: #f5a8a8;
    --state-error-border: #8a3a3a;
    --state-warn-border: #c8870a;
    --state-review-bg: #3a1525;
    --state-review-text: #ed93b1;
    --state-review-border: #7a3a52;

    --badge-fle-bg: #04342c;
    --badge-fle-text: #9fe1cb;
    --badge-esl-bg: #042c53;
    --badge-esl-text: #b5d4f4;

    --cat-teal-bg: #0f3d30;
    --cat-teal-text: #9fe1cb;
    --cat-teal-border: #5dcaa5;
    --cat-blue-bg: #0a2438;
    --cat-blue-text: #b5d4f4;
    --cat-blue-border: #3a6a9a;
    --cat-amber-bg: #3a2a0a;
    --cat-amber-text: #f0c060;
    --cat-amber-border: #8a6520;
    --cat-purple-bg: #221e42;
    --cat-purple-text: #c5bff5;
    --cat-purple-border: #5a529a;
    --cat-pink-bg: #3a1525;
    --cat-pink-text: #ed93b1;
    --cat-pink-border: #7a3a52;
    --cat-coral-bg: #3a1a12;
    --cat-coral-text: #f0997b;
    --cat-coral-border: #8a4530;
    --cat-gray-bg: #2a2a28;
    --cat-gray-text: #c8c6c0;
    --cat-gray-border: #555550;
  }

  .site-links a.active.esl { background: var(--site-esl-solid); color: var(--site-on-accent); }
  .scroll-top-btn:hover {
    background: var(--site-highlight);
    border-color: var(--site-accent-light);
    color: var(--site-accent);
  }
  .lp-precis-search-input,
  .lp-input,
  .lp-textarea {
    color-scheme: dark;
  }
}

.scroll-top-btn {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(12px);
  z-index: 900;
  width: 44px;
  height: 44px;
  border: 1px solid var(--site-border);
  border-radius: 50%;
  background: var(--site-surface);
  color: var(--site-text);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0, 0, 0, .12);
  opacity: 0;
  visibility: hidden;
  transition: opacity .2s, visibility .2s, transform .2s, background .15s;
}
.scroll-top-btn.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}
.scroll-top-btn:hover {
  background: var(--site-highlight);
  border-color: var(--site-accent-light);
  color: var(--site-accent-light);
}
.scroll-top-btn:focus-visible {
  outline: 2px solid var(--site-accent);
  outline-offset: 2px;
}

@media (max-width: 600px) {
  .site-nav {
    height: auto;
    min-height: var(--site-nav-h);
    padding: 10px 14px;
  }
  .site-nav-inner {
    flex-wrap: wrap;
    gap: 10px 12px;
  }
  .site-links {
    margin-left: 0;
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-start;
    row-gap: 6px;
  }
  .site-links a { padding: 6px 10px; font-size: 12px; }
  .site-logo span { display: none; }
  .site-container { padding: 18px 14px 36px; }
  .hero { padding: 32px 0 24px; }
  .site-back-main a { white-space: normal; }
  .scroll-top-btn { bottom: 16px; width: 40px; height: 40px; font-size: 18px; }
  .lx-construction-banner { left: 12px; right: 12px; bottom: 64px; max-width: none; font-size: 12px; }
}

/* Floating “under construction” notice (exercices hub) */
.lx-construction-banner {
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 850;
  max-width: min(520px, calc(100vw - 32px));
  margin: 0;
  padding: 10px 16px;
  border-radius: 10px;
  border: 1px solid var(--site-accent-light, #c4b5fd);
  background: var(--site-surface, #fff);
  color: var(--site-text, #1a1a2e);
  font-size: 13px;
  font-weight: 500;
  line-height: 1.45;
  text-align: center;
  box-shadow: 0 6px 24px rgba(0, 0, 0, .14);
  pointer-events: none;
}

/* Production access barrier for the interactive grammar section
   (bypassed automatically on localhost so it can be worked on locally). */
html.lx-gated, html.lx-gated body { overflow: hidden; height: 100%; }
.lx-construction-gate {
  position: fixed;
  inset: 0;
  z-index: 100000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: linear-gradient(160deg, #1e1b4b 0%, #312e81 60%, #4c1d95 100%);
}
.lx-construction-gate-card {
  width: min(560px, 100%);
  background: rgba(255, 255, 255, .97);
  color: #1a1a2e;
  border-radius: 18px;
  padding: 40px 32px 34px;
  text-align: center;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .4);
}
.lx-construction-gate-icon { font-size: 54px; line-height: 1; margin-bottom: 14px; }
.lx-construction-gate-card h1 { margin: 0 0 12px; font-size: 24px; font-weight: 800; }
.lx-construction-gate-card p { margin: 0 0 26px; font-size: 15.5px; line-height: 1.55; opacity: .88; }
.lx-construction-gate-back {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 10px;
  font-size: 14.5px;
  font-weight: 600;
  text-decoration: none;
  color: #fff;
  background: var(--site-accent, #7c3aed);
  transition: filter .15s ease;
}
.lx-construction-gate-back:hover { filter: brightness(1.1); }
@media (max-width: 520px) {
  .lx-construction-gate-card { padding: 32px 22px 28px; }
  .lx-construction-gate-card h1 { font-size: 20px; }
}