body {
  background-color: #f8fafc;
  font-family: "inter", sans-serif;
  margin: 0;
  padding: 0 20px;
  color: #475569;
}

.container {
  margin: 80px auto;
  max-width: 700px;
}
.form-container {
  padding: 16px;
  background-color: #ffffff;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  border-radius: 16px;
  margin-bottom: 32px;
}
.results-card {
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 18px;
  padding: 40px;
  margin-top: 35px;
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
  transition: 0.2s ease;
}
.results-card:hover {
  transform: translate(-2px);
}
.hidden {
  display: none;
}

h1 {
  text-align: center;
  font-weight: 800;
  font-size: 48px;
  color: #0f172a;
  line-height: 1.2;
  margin-bottom: 12px;
}
.subtitle {
  font-size: 18px;
  color: #475569;
  line-height: 1.5;
  max-width: 600px;
  margin: 0 auto 40px;
  text-align: center;
}
.topic-hint {
  font-size: 14px;
  margin-top: 10px;
}
.results-card h2 {
  font-size: 24px;
  font-weight: 700;
  color: #0f172a;
  margin: 0 0 20px;
  padding-bottom: 18px;
  border-bottom: 1px solid #e2e8f0;
}
.study-section {
  margin-bottom: 40px;
}
.study-section h3 {
  color: #2563eb;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 16px;
}
.study-section p {
  color: #475569;
  line-height: 1.8;
  font-size: 16px;
}

form {
  display: flex;
  gap: 12px;
}
.topic-input {
  padding: 16px;
  border: 1px solid #cbd5e1;
  border-radius: 16px;
  flex: 1;
  font-size: 16px;
}
.topic-input:focus {
  outline: none;
  border-color: #2563eb;
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.generate-button {
  font-size: 16px;
  margin-left: 5px;
  background-color: #2563eb;
  border: none;
  border-radius: 16px;
  color: #ffffff;
  padding: 16px 24px;
  width: 170px;
  transition: all 200ms ease-in-out;
}
.generate-button:hover {
  background-color: #1d4ed8;
  cursor: pointer;
}

.study-section ul {
  padding-left: 22px;
}
.study-section li {
  margin-bottom: 10px;
  color: #475569;
}
.quiz {
  background: #f8fafc;
  border-left: 3px solid #2563eb;
  border-radius: 12px;
  padding: 16px;
  line-height: 1.5;
  margin-bottom: 8px;
}
.quiz h4 {
  margin: 0 0 8px;
  color: #0f172a;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 20px;
}
th,
td {
  border: 1px solid #cbd5e1;
  padding: 14px;
  text-align: left;
}
th {
  background: #f8fafc;
  color: #0f172a;
}

footer {
  font-size: 14px;
  text-align: center;
  margin-top: 32px;
}
a {
  color: #2563eb;
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}
a:visited {
  color: #7c3aed;
}

.AI-generating {
  animation: blink-animation 1s steps(5, start) infinite;
}

@keyframes blink-animation {
  to {
    visibility: hidden;
  }
}
@-webkit-keyframes blink-animation {
  to {
    visibility: hidden;
  }
}