/* === LAYOUT RESETS === */
html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-color: #a2c1e8; /* pale denim base */
  color: #1e2a38;
  overscroll-behavior: none;
  overflow: hidden;
  box-sizing: border-box;
}

*,
*::before,
*::after {
  box-sizing: inherit;
}

/* === CONTAINERS === */
main {
  display: flex;
  flex-direction: column;
  height: calc(100% - 4rem); /* adjust if needed based on header/footer padding */
  padding-top: 1rem;
  padding-bottom: 1rem;
}

#top-div {
  flex: 1 1 auto;
  margin: 0 auto;
  max-width: 90%;
  height: 70vh;
  overflow-y: auto;
  background-color: #c2dafe; /* powder blue bg */
  border: 1px solid #7b9bbd; /* steel blue border */
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
  padding: 1rem;
}

/* === FOOTER / INPUT SECTION === */
#bottom-div {
  display: flex;
  gap: 1rem;
  align-items: flex-end;
  justify-content: center;
  position: fixed;
  bottom: 2vh;
  left: 0;
  width: 100%;
  padding: 0 1rem;
}

#textbox {
  flex: 1;
  resize: none;
  height: 20vh;
  padding: 0.75rem;
  background-color: #accbee;
  border-radius: 8px;
  border: 1px solid #729cc8;
  font-family: sans-serif;
  font-size: 1rem;
  color: #1c2938;
}

#sendbtn {
  background-color: #3b75d1;
  color: #d2e3fa;
  border: none;
  border-radius: 8px;
  font-weight: bold;
  cursor: pointer;
  height: 3rem;
  padding: 0 1.5rem;
  transition: background-color 0.3s ease;
  white-space: nowrap;
}

#sendbtn:hover {
  background-color: #2f61b2;
}

/* === MESSAGES === */
.chatbotp,
.userp {
  max-width: 80%;
  margin: 1rem 0;
  padding: 1rem;
  display: flex;
  border-radius: 10px;
  box-shadow: 1px 1px 4px rgba(0, 0, 0, 0.05);
}

.chatbotp {
  justify-content: flex-start;
  background-color: #d1e4fc;
  color: #1a2c3c;
  margin-right: auto;
}

.userp {
  justify-content: flex-end;
  background-color: #b4cdef;
  color: #102534;
  margin-left: auto;
}

/* === EXTRA STYLES === */
b {
  padding-right: 0.5rem;
}

span {
  white-space-collapse: preserve;
  overflow: hidden;
}

pre {
  white-space: pre-wrap;
  overflow-wrap: break-word;
  border-radius: 6px;
  padding: 0.75rem;
  font-family: "Courier New", Courier, monospace;
  background-color: #abc5e2;
  color: #10202e;
  margin: 0.5rem 0;
}

/* === SELECT BOX AREA === */
#model-select-div {
  text-align: center;
  padding: 0.5rem;
}

#model-select {
  max-width: 100%;
}

select {
  background-color: #9fbedf;
  border: 1px solid #6f8ca3;
  border-radius: 6px;
  padding: 0.25rem 0.5rem;
  color: #1e2b3a;
  font-size: 1rem;
}

/* === HR & COMMON ELEMENTS === */
hr {
  height: 0.5vh;
  background-color: #87a2bc;
  border: none;
}

p,
ul,
ol {
  margin-block-start: 0;
  margin-block-end: 0;
}

@media (max-width: 600px) {
  #top-div {
    max-width: 95%;
    height: 65vh;
    padding: 0.75rem;
  }

  .chatbotp,
  .userp {
    max-width: 90%;
    font-size: 0.95rem;
    padding: 0.75rem;
    margin: 0.5rem auto;
  }

  #textbox {
    height: 15vh;
    font-size: 1rem;
    padding: 0.6rem;
  }

  #sendbtn {
    height: 2.5rem;
    padding: 0 1rem;
    font-size: 1rem;
  }

  #bottom-div {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  select {
    font-size: 1rem;
  }

  pre {
    font-size: 0.9rem;
    padding: 0.5rem;
  }
}