body {
  font-family: 'Inter', Arial, sans-serif;
  background: #e0e0e0;
  color: #222;
  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
}
.install-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #bfa14a;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 8px 18px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
  transition: background 0.2s, box-shadow 0.2s;
  min-width: 44px;
  min-height: 44px;
  margin: 16px 0 0 0;
}
.install-btn:hover:not(:disabled) {
  background: #a88d2a;
  box-shadow: 0 2px 6px rgba(191,161,74,0.08);
}
.install-btn:active {
  background: #8c741f;
}
.install-btn:disabled {
  background: #6c757d;
  cursor: not-allowed;
  opacity: 0.7;
}

.paper {
  background: #f5f5f5;
  padding: 40px 30px;
  border: 1px solid #cccccc;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
  width: 100%;
  max-width: 900px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.progress {
    text-align: center;
    font-size: 36px;
    font-weight: bold;
    margin-bottom: 40px;
    color: #333333;
}
.progress div {
    margin: 10px 0;
}
.content {
    width: 100%;
}
.seder, .masechta {
    margin: 10px 0;
    text-align: left;
}
.seder-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    column-gap: 40px;
    row-gap: 20px;
    width: 100%;
    text-align: left;
}
.seder {
    text-align: left;
}
.masechta-list {
    margin-top: 5px;
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.5s ease-out;
}
.masechta-list.open {
    max-height: 1000px;
    transition: max-height 0.7s ease-in;
}
.seder-title, .masechta-title {
    cursor: pointer;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    padding: 8px 12px;
    border-radius: 8px;
    transition: background-color 0.3s ease, transform 0.2s ease;
}
.seder-title:hover {
    background-color: #f5f5f5;
    transform: scale(1.02);
}
.seder-title:active {
    background-color: #e0e0e0;
    transform: scale(0.98);
}
.chevron {
    margin-right: 8px;
    transition: transform 0.3s ease;
}
.masechta-icon {
    font-size: 16px;
    margin-right: 8px;
}
.seder-icon {
    font-size: 20px;
}
.fa-chevron-right {
    transform: rotate(0deg);
}
.chevron.open {
    transform: rotate(90deg);
}
.masechta-title {
    user-select: none;
}
.masechta-title:hover {
    background-color: #e0f0ff;
}
.masechta-title.active {
    background-color: #3399ff;
    color: white;
    border-radius: 8px;
}
button {
    margin: 5px;
    padding: 10px 20px;
    border: none;
    border-radius: 12px;
    background-color: #4CAF50;
    color: white;
    font-size: 16px;
    cursor: pointer;
    box-shadow: 2px 2px 5px rgba(0,0,0,0.2);
    transition: background-color 0.3s ease, transform 0.2s ease;
}
button:hover {
    background-color: #45a049;
    transform: scale(1.05);
}
.button-group {
    margin-bottom: 30px;
    text-align: center;
}
@media (max-width: 768px) {
    .seder-grid {
        grid-template-columns: 1fr;
    }
    .paper {
        padding: 20px 15px;
    }
    .progress {
        font-size: 28px;
        margin-bottom: 20px;
    }
    button {
        width: 100%;
        margin: 10px 0;
    }
}