* {
  margin: 0;
  padding: 0;
  border: 0;
  outline: 0;
  text-decoration: none;
  list-style: none;
  box-sizing: border-box;
}

:root {
  --color-primary: #6c63ff;
  --color-success: #00bf8e;
  --color-warning: #f7c94b;
  --color-danger: #f75842;
  --color-white: #fff;
  --color-light: rgba(255, 255, 255, 0.7);
  --color-black: #000;
  --color-bg: #1f2641;
  --color-bg1: #2e3267;
  --color-bg2: #424890;
  --transition: all 400ms ease;
}

body {
  font-family: "Montserrat", sans-serif;
  line-height: 1.7;
  color: var(--color-white);
  background: var(--color-bg);
  background-size: cover;
  background-position: center;
}

.container {
  width: var(--container-width-lg);
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

nav {
  background: var(--color-bg2);
  width: 100%;
  height: 5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2rem;
  position: fixed;
  top: 0;
  left: 0;
  z-index: 1000;
}

nav a {
  color: var(--color-white);
  font-size: 1rem;
  transition: var(--transition);
}

nav a:hover {
  color: var(--color-primary);
}

.chat-container {
  display: flex;
  flex-direction: column;
  width: 98%;
  max-width: 1200px;
  background: var(--color-bg1);
  border-radius: 1rem;
  padding: 2.5rem;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.2);
  margin-top: 7rem;
}

.chat-intro {
  background-color: var(--color-primary);
  padding: 1.5rem;
  border-radius: 1rem 1rem 0 0;
  font-size: 1.2rem;
  text-align: center;
  font-weight: bold;
}

.chat-messages {
  flex-grow: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  height: 450px;
  background: var(--color-bg);
  border-radius: 0 0 1rem 1rem;
}

.message {
  max-width: 60%;
  padding: 1rem;
  border-radius: 1rem;
  line-height: 1.5;
  word-break: break-word;
  margin-bottom: 10px;
}

.user .message {
  background-color: var(--color-success);
  color: var(--color-white);
  margin-left: auto;
  border-top-right-radius: 0;
}

.bot .message {
  background-color: var(--color-bg2);
  color: var(--color-white);
  margin-right: auto;
  border-top-left-radius: 0;
}

.chat-input {
  display: flex;
  background-color: var(--color-white);
  border-top: 2px solid var(--color-primary);
  padding: 1rem;
  border-radius: 0 0 1rem 1rem;
}

.chat-input input {
  flex-grow: 1;
  padding: 0.8rem;
  font-size: 1rem;
  border: 2px solid var(--color-bg2);
  background-color: var(--color-white);
  color: var(--color-black);
  border-radius: 0.5rem;
  margin-right: 10px;
  outline: none;
}

.chat-input button {
  padding: 0.8rem 1.5rem;
  background-color: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: var(--transition);
}

.chat-input button:hover {
  background-color: var(--color-warning);
}

footer {
  background: var(--color-bg2);
  text-align: center;
  padding: 2rem;
  margin-top: 3rem;
  color: var(--color-white);
}

/* =================== MEDIA QUERIES (TABLETS) ================ */
@media screen and (max-width: 1024px) {
  .chat-container {
    width: var(--container-width-md);
    padding: 1.5rem;
  }
  .chat-messages {
    height: 400px;
  }
}

/* =================== MEDIA QUERIES (PHONES) ================ */
@media screen and (max-width: 600px) {
  .chat-container {
    width: var(--container-width-sm);
    padding: 1rem;
  }
  .chat-messages {
    height: 350px;
  }
  .chat-input {
    flex-direction: column;
  }
  .chat-input input {
    margin-bottom: 0.5rem;
  }
  .chat-intro {
    font-size: 0.9rem;
  }
}