@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+Bengali:wght@400;700&display=swap');

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Noto Sans Bengali', sans-serif;
  background-color: #f0f8ff;
  color: #333;
  padding: 20px;
}

.container {
  max-width: 800px;
  margin: auto;
  background: #fff;
  padding: 30px 20px;
  border-radius: 12px;
  box-shadow: 0 0 15px rgba(0,0,0,0.08);
}

h1 {
  text-align: center;
  margin-bottom: 25px;
  color: #005b96;
}

.input-group,
.subject-row {
  margin-bottom: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

label {
  font-weight: bold;
}

input {
  padding: 12px;
  border: 1px solid #aaa;
  border-radius: 6px;
  font-size: 1em;
  flex: 1 1 100%;
}

.subject-row input {
  flex: 1;
  min-width: 100px;
}

button {
  display: block;
  margin: 15px auto;
  padding: 14px 22px;
  font-size: 1em;
  border: none;
  border-radius: 10px;
  font-weight: bold;
  cursor: pointer;
  transition: 0.3s;
  color: white;
}

.add-btn {
  background-color: #28a745;
}

.add-btn:hover {
  background-color: #1f7d38;
}

.check-btn {
  background-color: #007bff;
}

.check-btn:hover {
  background-color: #0056b3;
}

#result {
  margin-top: 20px;
  text-align: center;
  font-size: 1.2em;
}

#marksChart {
  margin-top: 30px;
  width: 100%;
  height: auto;
}

.performance-message {
  margin-top: 20px;
  padding: 15px;
  font-size: 1.2em;
  font-weight: bold;
  text-align: center;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.05);
}

.performance-message.good {
  background-color: #e0f9e7;
  color: #2e7d32;
}

.performance-message.moderate {
  background-color: #fff4e5;
  color: #ff9800;
}

.performance-message.low {
  background-color: #fdecea;
  color: #d32f2f;
}

.low-score {
  color: red;
  font-weight: bold;
}

.social-links {
  text-align: center;
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid #ccc;
}

.social-links p {
  font-size: 1.1em;
  margin-bottom: 10px;
  font-weight: bold;
}

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 15px;
}

.link {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  padding: 10px 15px;
  border-radius: 8px;
  font-weight: bold;
  background-color: #f3f3f3;
  transition: all 0.3s ease;
  font-size: 1em;
}

.link img {
  width: 20px;
  height: 20px;
}

.link:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.portfolio {
  background-color: #cce7ff;
}

.facebook {
  background-color: #e8f4ff;
  color: #1877f2;
}

.github {
  background-color: #f5f5f5;
  color: #333;
}

.instagram {
  background-color: #fde2e4;
  color: #c32aa3;
}

@media (max-width: 600px) {
  .subject-row {
    flex-direction: column;
  }

  .add-btn,
  .check-btn {
    width: 100%;
    margin-bottom: 10px;
  }

  .link {
    font-size: 0.95em;
    padding: 10px;
  }

  .links {
    flex-direction: column;
  }
}

.copyright {
  text-align: center;
  padding: 20px 15px;
  margin-top: 40px;
  font-size: 1em;
  background: linear-gradient(to right, #dbeeff, #f0f8ff);
  border-top: 1px solid #ccc;
  color: #2c3e50;
  box-shadow: inset 0 1px 5px rgba(0, 0, 0, 0.05);
}

.copyright p {
  margin: 0;
  line-height: 1.6;
}

.copyright a {
  color: #0066cc;
  text-decoration: none;
  font-weight: 600;
  transition: color 0.3s ease, text-shadow 0.3s ease;
}

.copyright a:hover {
  color: #003366;
  text-shadow: 0 0 3px rgba(0, 102, 204, 0.4);
}