/**
 * Zadania online — Style ekranu logowania ucznia (web/index.html)
 * Klawiatura/dotyk, czytelne przyciski z nazwiskami, filtry literowe.
 */

.login-page {
  background-color: var(--bg-app);
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.login-container {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.login-card {
  width: 100%;
  max-width: 680px;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: 2rem;
}

.login-session-header {
  background-color: var(--color-primary-light);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  margin-bottom: 1.5rem;
}

.login-session-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}

.login-session-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.pin-input-group {
  display: flex;
  gap: 0.75rem;
  margin: 1.25rem 0;
}

.pin-input {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.25em;
  text-align: center;
  padding: 0.6rem 1rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  max-width: 320px;
}

.pin-input:focus {
  border-color: var(--color-primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.2);
}

/* Filtry literowe */
.letter-filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 1rem 0;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border-color);
}

.letter-btn {
  background-color: var(--bg-surface-alt);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.65rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-main);
}

.letter-btn:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary);
}

.letter-btn.active {
  background-color: var(--color-primary);
  color: var(--text-inverse);
  border-color: var(--color-primary);
}

/* Siatka uczniów */
.student-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
  margin: 1.25rem 0;
  max-height: 380px;
  overflow-y: auto;
  padding: 0.25rem;
}

.student-grid.student-grid-numbers {
  grid-template-columns: repeat(auto-fill, minmax(72px, 1fr));
  gap: 0.6rem;
}

.btn-student.btn-student-number {
  min-height: 56px;
  font-size: 1.4rem;
  font-weight: 700;
  font-family: var(--font-mono, monospace);
  padding: 0.5rem;
}

.student-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 52px;
  padding: 0.6rem 0.85rem;
  background-color: var(--bg-surface);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-main);
  cursor: pointer;
  text-align: center;
  transition: all 0.15s ease;
}

.student-btn:hover {
  background-color: var(--color-primary-light);
  border-color: var(--color-primary);
  transform: translateY(-1px);
}

.student-btn.selected {
  background-color: var(--color-primary);
  color: var(--text-inverse);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-sm);
}

.student-btn.selected-pair {
  background-color: #0d9488;
  color: var(--text-inverse);
  border-color: #0f766e;
}

/* Sekcja komputera PC */
.pc-input-wrapper {
  margin: 1rem 0;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.pc-input {
  width: 90px;
  font-size: 1.2rem;
  font-weight: 700;
  text-align: center;
  padding: 0.4rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
}

/* Sekcja par */
.pairs-toggle-wrapper {
  margin: 1rem 0;
  padding: 0.85rem;
  background-color: var(--bg-surface-alt);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
}

.login-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 1.75rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-color);
}

/* Ekran oczekiwania na zgodę */
.wait-box {
  text-align: center;
  padding: 2.5rem 1.5rem;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 5px solid var(--border-color);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 0 auto 1.5rem auto;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.wait-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.wait-desc {
  color: var(--text-muted);
  max-width: 400px;
  margin: 0 auto;
}