:root {
  /* Luxembourg flag (exact) */
  --flag-red:   #CE1126;
  --flag-white: #FFFFFF;
  --flag-blue:  #00A3E0;

  /* Lothringer brand palette */
  --navy-dark:  #050D50;
  --navy:       #004489;
  --blue:       #3399CC;
  --cyan:       #66CCFF;
  --orange:     #F7AA14;
  --orange-dim: #C98A00;

  /* Derived semantic aliases */
  --red:        #CE1126;
  --red-deep:   #A50E1F;
  --dark:       #050D50;
  --mid:        #004489;
  --muted:      #5A7A9A;
  --light:      #F0F5FA;
  --white:      #FFFFFF;
  --border:     #C8DCF0;
  --border-dark:#7AAED0;

  --radius:    8px;
  --radius-lg: 14px;
  --shadow:    0 2px 12px rgba(5,13,80,0.10);
  --shadow-lg: 0 8px 32px rgba(5,13,80,0.18);

  --font-head: 'Fraunces', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --max-w:     860px;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: var(--font-body);
  background: var(--light);
  color: var(--dark);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a   { color: inherit; text-decoration: none; }
img { max-width: 100%; }
.site-main {
  flex: 1;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 5rem;
  width: 100%;
}
.site-main--wide { max-width: 1280px; }
@media (max-width: 600px) {
  .site-main { padding: 1.5rem 1rem 4rem; }
}
.site-header {
  background: var(--navy-dark);
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 10px rgba(0,0,0,0.4);
}
/* Luxembourg tricolor stripe */
.site-header::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0; right: 0;
  height: 5px;
  background: linear-gradient(
    to right,
    var(--flag-red)   0%    33.33%,
    var(--flag-white) 33.33% 66.66%,
    var(--flag-blue)  66.66% 100%
  );
}
.logo {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-head);
  font-size: 1.35rem;
  color: var(--white);
  letter-spacing: -0.01em;
}
.logo-flag   { width: 1.6rem; height: auto; border-radius: 2px; flex-shrink: 0; }
.logo strong { color: var(--orange); }
.site-nav {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.site-nav a {
  color: rgba(255,255,255,0.65);
  font-size: 0.875rem;
  font-weight: bold;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color 0.2s;
  padding: 0 0.15rem;
}
.site-nav a:hover { color: var(--cyan); }
.site-nav .btn-outline {
  border-color: rgba(255,255,255,0.7);
  color: var(--white);
}
.site-nav .btn-outline:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(102,204,255,0.08);
}
.nav-link {
  color: rgba(255,255,255,0.75);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  padding: 0.3rem 0.1rem;
  transition: color 0.2s;
  white-space: nowrap;
}
.nav-link:hover { color: var(--cyan); }
.nav-sep {
  display: block;
  width: 1px;
  height: 20px;
  background: rgba(255,255,255,0.2);
  flex-shrink: 0;
}
.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  background: rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 3px;
}
.lang-opt {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 0.25rem 0.5rem;
  border-radius: calc(var(--radius) - 2px);
  color: rgba(255,255,255,0.6);
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}
.lang-opt:hover { color: var(--white); background: rgba(255,255,255,0.12); }
.lang-opt--active { background: var(--orange); color: var(--white) !important; }
.nav-username {
  color: rgba(255,255,255,0.65);
  font-size: 0.875rem;
  font-weight: 600;
}
.btn-ghost-nav {
  background: transparent;
  border: 2px solid rgba(255,255,255,0.7);
  border-radius: var(--radius);
  color: var(--white);
  font-size: 0.875rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.04em;
  padding: 0.4rem 1rem;
  font-family: var(--font-body);
  transition: color 0.2s, border-color 0.2s;
  text-transform: uppercase;
}
.btn-ghost-nav:hover { color: var(--cyan); border-color: var(--cyan); }
/* ── Hamburger (CSS-only) ── */
.nav-check  { display: none; }
.nav-toggle { display: none; }
@media (max-width: 720px) {
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px; height: 40px;
    border-radius: var(--radius);
    border: 2px solid rgba(255,255,255,0.55);
    color: var(--white);
    font-size: 1.3rem;
    cursor: pointer;
    flex-shrink: 0;
    line-height: 1;
    user-select: none;
    transition: border-color 0.2s, color 0.2s;
  }
  .nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }

  .site-nav {
    display: none !important;
    position: absolute;
    top: 64px;
    left: 0; right: 0;
    background: var(--navy-dark);
    flex-direction: column !important;
    align-items: stretch !important;
    gap: 0 !important;
    padding: 0.75rem 1.25rem 1.25rem;
    border-bottom: 3px solid var(--orange);
    box-shadow: 0 8px 24px rgba(0,0,0,0.4);
    z-index: 99;
  }
  .nav-check:checked ~ .site-nav { display: flex !important; }

  .site-nav .nav-username {
    display: block;
    padding: 0.5rem 0 0.75rem;
    border-bottom: 1px solid rgba(255,255,255,0.12);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
  }

  .nav-sep { display: none; }
  .lang-switch { align-self: center; margin: 0.5rem auto 0; }

  .site-nav a,
  .site-nav .btn-ghost-nav { width: 100%; text-align: center; justify-content: center; }

  .site-nav form { display: block !important; width: 100%; }
  .site-nav form .btn { width: 100%; justify-content: center; }
}
.site-footer {
  background: var(--navy-dark);
  color: rgba(255,255,255,0.38);
  text-align: center;
  padding: 1.4rem 1.4rem 1.2rem;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  border-top: 3px solid var(--orange);
}
.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin-top: 0.85rem;
}
.footer-brand__link {
  display: flex;
  align-items: center;
  opacity: 0.7;
  transition: opacity 0.2s;
}
.footer-brand__link:hover { opacity: 1; }
.footer-brand__logo  { height: 28px; width: auto; }
.footer-brand__copy   { color: rgba(255,255,255,0.38); font-size: 0.78rem; letter-spacing: 0.04em; }
.footer-brand__policy { color: rgba(255,255,255,0.38); font-size: 0.78rem; letter-spacing: 0.04em; transition: color 0.2s; }
.footer-brand__policy:hover { color: rgba(255,255,255,0.7); }
.footer-address {
  margin-top: 0.75rem;
  font-style: normal;
  font-size: 0.75rem;
  color: rgba(255,255,255,0.28);
  letter-spacing: 0.03em;
}
.footer-build {
  margin-top: 0.6rem;
  font-size: 0.7rem;
  opacity: 0.35;
  letter-spacing: 0.05em;
  font-family: monospace;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.4rem;
  border-radius: var(--radius);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.18s ease;
  white-space: nowrap;
  letter-spacing: 0.03em;
}
.btn-primary { background: var(--red); color: var(--white); border-color: var(--red); }
.btn-primary:hover { background: var(--red-deep); border-color: var(--red-deep); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-outline { background: transparent; border-color: var(--border-dark); color: var(--mid); }
.btn-outline:hover { border-color: var(--orange); color: var(--orange-dim); background: rgba(247,170,20,0.07); }
.btn-success { background: #1a7a3a; color: var(--white); }
.btn-danger  { background: transparent; border: 2px solid var(--red); color: var(--red); }
.btn-danger:hover { background: var(--red); color: var(--white); }
.btn-lg { padding: 0.8rem 2rem; font-size: 1rem; }
.btn-sm { padding: 0.38rem 0.9rem; font-size: 0.8rem; }
.auth-form { display: flex; flex-direction: column; gap: 1rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 420px) { .form-row { grid-template-columns: 1fr; } }
.form-field { display: flex; flex-direction: column; gap: 0.35rem; }
.form-field label {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--navy);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.form-hint { font-size: 0.75rem; color: var(--muted); font-weight: 400; text-transform: none; letter-spacing: 0; }
.form-field input {
  padding: 0.7rem 0.9rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: var(--font-body);
  color: var(--navy-dark);
  background: var(--white);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
}
.form-field input:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(51,153,204,0.15);
}
.form-select {
  padding: 0.7rem 0.9rem;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: var(--font-body);
  color: var(--navy-dark);
  background: var(--white);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  cursor: pointer;
}
.form-select:focus {
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(51,153,204,0.15);
}
/* ── Password reveal ── */
.pw-wrap {
  position: relative;
  display: flex;
}
.pw-wrap input {
  flex: 1;
  padding-right: 2.6rem;
}
.pw-toggle {
  position: absolute;
  right: 0;
  top: 0; bottom: 0;
  width: 2.4rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted);
  font-size: 1rem;
  transition: color 0.2s;
  padding: 0;
}
.pw-toggle:hover { color: var(--navy); }
.form-error {
  background: #fdf0f1;
  color: var(--red-deep);
  border: 1px solid rgba(206,17,38,0.25);
  border-left: 4px solid var(--red);
  border-radius: var(--radius);
  padding: 0.65rem 0.9rem;
  font-size: 0.875rem;
  font-weight: 600;
}
.form-success {
  background: #edf7f1;
  color: #155c2c;
  border: 1px solid rgba(26,122,58,0.25);
  border-left: 4px solid #1a7a3a;
  border-radius: var(--radius);
  padding: 0.65rem 0.9rem;
  font-size: 0.875rem;
  font-weight: 600;
}
.form-submit { width: 100%; justify-content: center; margin-top: 0.25rem; }
.form-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-top: 0.25rem;
}
.form-actions .form-submit { flex: 1; margin-top: 0; }
.modal-backdrop {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(5,13,80,0.65);
  backdrop-filter: blur(3px);
  z-index: 500;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}
.modal-backdrop.is-open { display: flex; }
body.modal-open { overflow: hidden; }
.modal {
  background: var(--white);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 420px;
  box-shadow: 0 24px 64px rgba(5,13,80,0.35);
  position: relative;
  border-top: 5px solid var(--orange);
  animation: modal-in 0.22s ease;
}
@keyframes modal-in {
  from { opacity: 0; transform: translateY(16px) scale(0.97); }
  to   { opacity: 1; transform: translateY(0)   scale(1); }
}
.modal__close {
  position: absolute;
  top: 0.9rem; right: 1rem;
  background: none;
  border: none;
  font-size: 1.1rem;
  color: var(--muted);
  cursor: pointer;
  line-height: 1;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  transition: color 0.15s, background 0.15s;
}
.modal__close:hover { color: var(--navy-dark); background: var(--light); }
.modal-tabs {
  display: flex;
  border-bottom: 2px solid var(--border);
  padding: 1.4rem 1.75rem 0;
}
.modal-tab {
  background: none;
  border: none;
  padding: 0.5rem 0.1rem;
  margin-right: 1.75rem;
  font-size: 0.9rem;
  font-weight: 700;
  font-family: var(--font-body);
  color: var(--muted);
  cursor: pointer;
  border-bottom: 3px solid transparent;
  margin-bottom: -2px;
  transition: color 0.15s, border-color 0.15s;
  letter-spacing: 0.02em;
}
.modal-tab.active { color: var(--navy-dark); border-bottom-color: var(--orange); }
.modal-tab:hover:not(.active) { color: var(--navy); }
.modal-pane  { padding: 1.75rem; }
.modal__title   { font-family: var(--font-head); font-size: 1.4rem; margin-bottom: 0.25rem; color: var(--navy-dark); }
.modal__sub     { font-size: 0.875rem; color: var(--muted); margin-bottom: 1.5rem; }
.modal__body    { font-size: 0.925rem; color: var(--muted); line-height: 1.6; margin: 0.75rem 0 1.5rem; }
.modal__actions { display: flex; gap: 0.75rem; flex-wrap: wrap; justify-content: flex-end; }
.modal__switch {
  text-align: center;
  margin-top: 1.25rem;
  font-size: 0.875rem;
  color: var(--muted);
}
.link-btn {
  background: none;
  border: none;
  color: var(--blue);
  font-weight: 700;
  cursor: pointer;
  font-size: inherit;
  font-family: inherit;
  padding: 0;
  transition: color 0.15s;
}
.link-btn:hover { color: var(--navy); }
.page-header { margin-bottom: 2rem; }
.breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--navy-dark);
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 999px;
  padding: 0.35rem 0.9rem;
  margin-bottom: 1rem;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
  letter-spacing: 0.04em;
}
.breadcrumb:hover { border-color: var(--orange); color: var(--orange); background: rgba(247,170,20,0.06); }
.lesson-title    { font-family: var(--font-head); font-size: clamp(1.6rem, 4vw, 2.2rem); letter-spacing: -0.02em; margin-bottom: 0.35rem; color: var(--navy-dark); }
.lesson-subtitle { color: var(--muted); font-size: 1rem; }
.unit-hero       { display: flex; align-items: center; gap: 1rem; }
.unit-hero__icon  { font-size: 2.8rem; }
.unit-hero__title { font-family: var(--font-head); font-size: clamp(1.5rem, 4vw, 2rem); letter-spacing: -0.02em; margin-bottom: 0.25rem; color: var(--navy-dark); }
.unit-hero__desc  { color: var(--muted); font-size: 0.95rem; }
.section-title {
  font-family: var(--font-head);
  font-size: 1.5rem;
  color: var(--navy-dark);
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--border);
  position: relative;
}
.section-title::after {
  content: '';
  position: absolute;
  bottom: -4px; left: 0;
  width: 48px; height: 2px;
  background: var(--orange);
}
@media (max-width: 600px) {
  .unit-hero { flex-wrap: wrap; }
}
/* ── Cookie Banner ──────────────────────────────────────────────────────── */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--navy-dark);
  border-top: 1px solid rgba(255,255,255,0.12);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  flex-wrap: wrap;
  box-shadow: 0 -2px 12px rgba(0,0,0,0.25);
}
.cookie-banner[hidden] { display: none; }
.cookie-banner__text {
  color: rgba(255,255,255,0.8);
  font-size: 0.875rem;
  line-height: 1.5;
  flex: 1;
  min-width: 220px;
}
.cookie-banner__text a { color: var(--orange); text-decoration: underline; text-underline-offset: 2px; }
.cookie-banner__actions { display: flex; align-items: center; gap: 0.6rem; flex-shrink: 0; flex-wrap: wrap; }
/* Ghost button for dark banner */
.cookie-btn-ghost {
  background: transparent;
  color: rgba(255,255,255,0.75);
  border: 1.5px solid rgba(255,255,255,0.3);
}
.cookie-btn-ghost:hover { color: #fff; border-color: rgba(255,255,255,0.65); }
/* ── Cookie Preferences Panel ───────────────────────────────────────────── */
.cookie-panel {
  position: fixed;
  inset: 0;
  z-index: 1001;
  background: rgba(5,13,80,0.55);
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.cookie-panel[hidden] { display: none; }
.cookie-panel__card {
  background: var(--white);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  padding: 2rem 2rem 2.5rem;
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 -4px 24px rgba(5,13,80,0.18);
}
.cookie-panel__title {
  font-family: var(--font-head);
  font-size: 1.15rem;
  color: var(--navy-dark);
  margin: 0 0 0.5rem;
}
.cookie-panel__intro {
  font-size: 0.875rem;
  color: var(--muted);
  margin: 0 0 1.25rem;
  line-height: 1.5;
}
.cookie-panel__intro a { color: var(--orange); text-underline-offset: 2px; }
/* Category rows */
.cookie-category { border-top: 1px solid var(--border); padding: 1rem 0; }
.cookie-category__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.35rem;
}
.cookie-category__name { font-weight: 700; font-size: 0.9rem; color: var(--navy-dark); }
.cookie-category__desc { font-size: 0.82rem; color: var(--muted); line-height: 1.5; margin: 0; }
/* Always-active badge */
.cookie-always-on {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #166534;
  background: #dcfce7;
  padding: 0.2rem 0.6rem;
  border-radius: 99px;
  flex-shrink: 0;
}
/* Toggle switch */
.cookie-toggle { position: relative; display: inline-flex; align-items: center; flex-shrink: 0; cursor: pointer; }
.cookie-toggle input { position: absolute; opacity: 0; width: 0; height: 0; }
.cookie-toggle__track {
  width: 44px;
  height: 24px;
  background: var(--border);
  border-radius: 24px;
  transition: background 0.2s;
  display: flex;
  align-items: center;
  padding: 0 3px;
}
.cookie-toggle input:checked ~ .cookie-toggle__track { background: var(--blue, #3399cc); }
.cookie-toggle__thumb {
  width: 18px;
  height: 18px;
  background: #fff;
  border-radius: 50%;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
  transition: transform 0.2s;
  flex-shrink: 0;
}
.cookie-toggle input:checked ~ .cookie-toggle__track .cookie-toggle__thumb { transform: translateX(20px); }
.cookie-toggle input:focus-visible ~ .cookie-toggle__track { outline: 2px solid var(--navy); outline-offset: 2px; }
/* Panel actions */
.cookie-panel__actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
  margin-top: 1.5rem;
  flex-wrap: wrap;
}
/* Ghost button variant for white panel */
.cookie-btn-ghost--light {
  color: var(--muted);
  border-color: var(--border);
}
.cookie-btn-ghost--light:hover { color: var(--navy-dark); border-color: var(--navy); }
@media (max-width: 500px) {
  .cookie-banner { padding: 1rem; flex-direction: column; align-items: flex-start; }
  .cookie-banner__actions { width: 100%; }
  .cookie-banner__actions .btn { flex: 1; text-align: center; }
  .cookie-panel__card { padding: 1.5rem 1.25rem 2rem; border-radius: var(--radius-lg) var(--radius-lg) 0 0; }
  .cookie-panel__actions { flex-direction: column-reverse; }
  .cookie-panel__actions .btn { width: 100%; text-align: center; }
}