* {
  box-sizing: border-box;
}

body {
  font-family: 'Poppins', sans-serif;
  background: linear-gradient(135deg, #4f46e5, #3b82f6);
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 40px;
  min-height: 100vh;
  margin: 0;
}

.container {
  background: #fff;
  border-radius: 16px;
  width: 90%;
  max-width: 500px;
  padding: 30px 25px 40px;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

h2 {
  color: #374151;
  font-size: 22px;
  margin-bottom: 15px;
  text-align: center;
}

input {
  width: 100%;
  padding: 12px;
  font-size: 16px;
  border: 2px solid #e5e7eb;
  border-radius: 8px;
  outline: none;
  transition: 0.3s;
}

input:focus {
  border-color: #3b82f6;
}

button {
  background: #3b82f6;
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  transition: 0.3s;
  margin-top: 10px;
}

button:hover {
  background: #2563eb;
}

.task-list {
  background: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 10px;
  margin-top: 15px;
  text-align: left;
  max-height: 300px;
  overflow-y: auto;
}

.task-item {
  background: #f3f4f6;
  margin: 5px 0;
  padding: 8px 10px;
  border-radius: 6px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 15px;
  gap: 6px;
  flex-wrap: wrap; /* মোবাইলের জন্য ফ্লেক্স আইটেম ভাঙবে */
}

.task-text.done {
  text-decoration: line-through;
  color: gray;
}

.btn-group {
  display: flex;
  gap: 5px;
  flex-wrap: wrap; /* মোবাইল স্ক্রিনে বাটন লাইন ভাঙবে */
  justify-content: flex-end;
}

.delete-btn {
  background: #ef4444;
}

.delete-btn:hover {
  background: #dc2626;
}

.complete-btn {
  background: #10b981;
}

.complete-btn:hover {
  background: #059669;
}

.incomplete-btn {
  background: #f59e0b;
}

.incomplete-btn:hover {
  background: #d97706;
}

.restart {
  background: #0ea5e9;
  width: 100%;
  margin-top: 15px;
}

.restart:hover {
  background: #0284c7;
}

/* 🌐 মোবাইল রেসপনসিভ অংশ */
@media (max-width: 600px) {
  .container {
    width: 95%;
    padding: 20px;
    border-radius: 10px;
  }

  h2 {
    font-size: 18px;
  }

  input {
    font-size: 14px;
    padding: 10px;
  }

  button {
    width: 100%;
    font-size: 14px;
    padding: 10px;
  }

  .task-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .btn-group {
    width: 100%;
    justify-content: space-between;
  }

  .task-list {
    max-height: 250px;
  }
}