/* Base reset and responsive-friendly defaults */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { font-family: system-ui, sans-serif; margin: 0; padding: 0; line-height: 1.5; display: flex; min-height: 100vh; flex-direction: column; }
img, video { max-width: 100%; height: auto; }
header { background: #0a2540; color: #fff; padding: 12px 16px; }
.container { max-width: 64rem; margin: 0 auto; padding-inline: 16px; }
@media (min-width: 48rem) { .container { padding-inline: 24px; } }

.header-content { max-width: 64rem; margin: 0 auto; }
.header-navigation {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 8px;
}
.auth-navigation {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
}
.auth-navigation form { margin: 0; }

/* Sticky footer layout */
main { flex: 1 1 auto; }

/* Fluid typography */
h1 { font-size: clamp(1.25rem, 2vw + 1rem, 2rem); margin: 0; }
h2 { font-size: clamp(1.125rem, 1.2vw + 0.9rem, 1.5rem); }
p  { font-size: 1rem; }


/* Navigation buttons */
nav.nav { display: flex; gap: 8px; flex-wrap: wrap; }
.nav-btn {
  appearance: none;
  display: inline-block;
  padding: 8px 14px;
  border-radius: 999px;
  background: #1e90ff; /* blue */
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  border: 1px solid #1a7fdc;
  line-height: 1.2;
  min-height: 36px;
}
.nav-btn:hover { background: #167ad6; }
.nav-btn:disabled {
  opacity: 0.5;           /* match .disabled-link */
  pointer-events: none;   /* ignore mouse interactions */
}
.nav-btn.active {
  background: #fff; /* active: white */
  color: #0a2540;
  border-color: #e5e7eb;
  box-shadow: 0 1px 2px rgba(0,0,0,0.06);
}
header nav { margin-top: 0; }
@media (min-width: 48rem) {
  nav.nav { flex-wrap: nowrap; }
}
@media (max-width: 48rem) {
  .header-navigation {
    align-items: stretch;
    flex-direction: column;
  }

  .auth-navigation {
    justify-content: flex-end;
  }
}

/* Footer */
.footer { background: #0a2540; color: #cbd5e1; padding: 12px 16px; }
.footer .container { display: flex; flex-direction: column; align-items: flex-start; gap: 12px; }
@media (min-width: 48rem) { .footer .container { flex-direction: row; align-items: center; justify-content: space-between; } }
.footer-nav { display: flex; gap: 12px; }
.footer-nav a { color: #93c5fd; text-decoration: none; }
.footer-nav a:hover { text-decoration: underline; }

/* Utilities */
.stack > * + * { margin-top: 12px; }

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

/* Exercise page */
.exercise-form { display: block; }
.grid-2 { display: grid; grid-template-columns: 1fr; gap: 12px; }
@media (min-width: 42rem) { .grid-2 { grid-template-columns: repeat(2, 1fr); } }
.grid-3 { display: grid; grid-template-columns: 1fr; gap: 12px; }
@media (min-width: 48rem) { .grid-3 { grid-template-columns: repeat(3, 1fr); } }
.field label { display: block; font-weight: 600; margin-bottom: 4px; }
.field input[type="number"] {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid #cbd5e1;
  border-radius: 8px;
}
.controls { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.card {
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  padding: 12px;
  background: #fff;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
.card-title { color: #475569; font-size: 0.9rem; }
.card-value { font-size: 1.5rem; font-weight: 700; margin-top: 4px; }
.indicators { margin-top: 8px; }
.rounds-info, .total-time-info { margin-top: 8px; color: #334155; }
.disabled-link { pointer-events: none; opacity: 0.5; }


/* Home page styles */
.home-stack {
  text-align: center;
  padding: 2rem 0;
}

.home-title {
  font-size: clamp(1.5rem, 2vw + 1rem, 2.5rem);
  margin-bottom: 1rem;
  color: #0a2540;
}

.home-subtitle {
  font-size: 1.2rem;
  color: #475569;
  margin-bottom: 2rem;
}

.home-features {
  margin: 2rem 0;
}

.home-card h3.card-title {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
  color: #0a2540;
}

.home-card p {
  color: #475569;
  line-height: 1.5;
  margin: 0;
}

.home-controls {
  justify-content: center;
  margin: 2rem 0;
}

.home-controls .nav-btn {
  min-width: 200px;
  text-align: center;
}

.nav-btn--secondary {
  background: #6c757d;
  border-color: #5a6268;
}

.nav-btn--secondary:hover {
  background: #545b62;
}

.home-methodology {
  margin-top: 2rem;
}

@media (max-width: 48rem) {
  .home-controls {
      flex-direction: column;
      align-items: center;
  }

  .home-controls .nav-btn {
      min-width: 250px;
  }
}

/* Trainings navigation dropdown */
.training-menu {
  position: relative;
  display: flex;
  align-items: stretch;
}

.training-menu > .nav-btn {
  border-bottom-right-radius: 0;
  border-top-right-radius: 0;
}

.training-menu-toggle {
  appearance: none;
  min-height: 36px;
  padding: 8px 10px;
  border: 1px solid #1a7fdc;
  border-left: 0;
  border-bottom-right-radius: 999px;
  border-top-right-radius: 999px;
  background: #1e90ff;
  color: #fff;
  cursor: pointer;
  font: inherit;
  line-height: 1;
}

.training-menu-toggle:hover,
.training-menu-toggle:focus-visible {
  background: #167ad6;
}

.training-menu-toggle:focus-visible,
.training-menu-list a:focus-visible {
  outline: 3px solid #fff;
  outline-offset: 2px;
}

.training-menu-list {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  z-index: 10;
  display: none;
  min-width: 18rem;
  padding: 8px;
  border: 1px solid #cbd5e1;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.2);
}

.training-menu-list a {
  display: block;
  padding: 8px 10px;
  border-radius: 8px;
  color: #0a2540;
  text-decoration: none;
}

.training-menu-list a:hover,
.training-menu-list a:focus-visible {
  background: #e0f2fe;
}

.training-menu:hover .training-menu-list,
.training-menu:focus-within .training-menu-list,
.training-menu.is-open .training-menu-list {
  display: block;
}

/* Trainings catalogue */
.trainings-page {
  padding-bottom: 32px;
  padding-top: 24px;
}

.trainings-page__header {
  max-width: 42rem;
}

.trainings-page__header p {
  color: #475569;
}

.trainings-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 24px;
}

.training-card {
  padding: 20px;
  border: 1px solid #e5e7eb;
  border-radius: 12px;
  background: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.training-card h3 {
  margin-top: 0;
  color: #0a2540;
}

.training-card p,
.training-card__features {
  color: #475569;
}

.training-card__features {
  margin-bottom: 20px;
  padding-left: 20px;
}

/* Statistics session actions */
.training-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}

.training-actions form { margin: 0; }
.statistics-table-wrapper { overflow-x: auto; }
.statistics-table .training-actions {
  flex-wrap: nowrap;
}
.statistics-table .training-actions > * { flex: 0 0 auto; }
.statistics-table .training-actions .nav-btn { white-space: nowrap; }
.training-actions button { font: inherit; cursor: pointer; }
.training-action-note { color: #475569; }

.nav-btn--danger {
  background: #b91c1c;
  border-color: #991b1b;
}

.nav-btn--danger:hover { background: #991b1b; }
.training-actions .nav-btn:focus-visible {
  outline: 3px solid #0a2540;
  outline-offset: 3px;
}