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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', sans-serif;
  background: linear-gradient(135deg, #e0f7fa, #f1f8e9);
  margin: 0;
  padding: 20px;
  color: #2d3436;
  -webkit-font-smoothing: antialiased;
  animation: fadeInBody 1.2s ease forwards;
}

h1 {
  text-align: center;
  color: #2c3e50;
  font-size: 2.8rem;
  margin-bottom: 30px;
  animation: fadeInDown 1s ease-in-out;
}

/* TABLE STYLES */
table {
  width: 100%;
  border-collapse: collapse;
  background: #fff;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.1);
  border-radius: 16px;
  overflow: hidden;
  animation: fadeInUp 0.8s ease;
  transition: box-shadow 0.4s ease;
}

table:hover {
  box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

th, td {
  padding: 16px;
  border: 1px solid #e0e0e0;
  text-align: center;
  transition: background 0.3s ease, color 0.3s ease;
}

th {
  background: linear-gradient(to right, #3498db, #5dade2);
  color: white;
  font-weight: 600;
  letter-spacing: 0.4px;
}

td[contenteditable="true"], th[contenteditable="true"] {
  background-color: #fefefe;
  cursor: text;
  transition: background-color 0.4s ease;
}

td.done {
  background-color: #c8e6c9 !important;
  text-decoration: line-through;
}

td:hover {
  background: #eafaf1;
}

th:first-child,
td:first-child {
  background-color: #f0f4f8;
  font-weight: bold;
}

/* NOTE SECTION */
#note {
  margin-top: 30px;
  padding: 15px;
  border: 1px solid #ccc;
  background: #ffffff;
  border-radius: 12px;
  font-size: 1rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  animation: fadeInUp 1s ease;
}

/* BUTTONS */
button,
#exportBtn,
#addRowBtn,
#aiGenerateBtn {
  font-size: 16px;
  padding: 12px 24px;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  color: #fff;
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

#exportBtn {
  background: #2ecc71;
}

#addRowBtn {
  background: #3498db;
}

#addRowBtn:hover {
  background: #2980b9;
  transform: scale(1.05);
  box-shadow: 0 6px 14px rgba(41, 128, 185, 0.6);
}

#exportBtn:hover {
  background: #27ae60;
  transform: scale(1.05);
  box-shadow: 0 6px 14px rgba(39, 174, 96, 0.6);
}

#aiGenerateBtn {
  background: #8e44ad;
  margin-top: 10px;
}

#aiGenerateBtn:hover {
  background-color: #732d91;
  transform: scale(1.05);
  box-shadow: 0 6px 14px rgba(115, 45, 145, 0.6);
}

.remove-btn {
  background: #e74c3c;
  font-size: 14px;
  padding: 6px 12px;
  border-radius: 6px;
  margin-left: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.2);
  transition: background-color 0.3s ease, transform 0.3s ease;
}

.remove-btn:hover {
  background: #c0392b;
  transform: scale(1.1);
}

h3 {
  font-size: 1.4rem;
  margin-top: 40px;
  color: #2c3e50;
  animation: fadeInDown 0.8s ease forwards;
}

/* CHATBOT WIDGET */
.chatbot-widget {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 350px;
  z-index: 999;
  font-family: 'Segoe UI', sans-serif;
  animation: fadeIn 1s ease-in-out;
}

.chat-header {
  background-color: #4caf50;
  color: white;
  padding: 12px 16px;
  border-radius: 12px 12px 0 0;
  cursor: pointer;
  font-weight: bold;
  text-align: center;
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.chat-container {
  background: #fff;
  border: 1px solid #ccc;
  border-top: none;
  max-height: 400px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  border-radius: 0 0 12px 12px;
  box-shadow: 0 6px 12px rgba(0,0,0,0.15);
}

.chat-container.hidden {
  display: none;
}

.chat-box {
  padding: 10px;
  height: 300px;
  overflow-y: auto;
  font-size: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: #f9f9f9;
  border-radius: 0 0 12px 12px;
}

.chat-input-area {
  display: flex;
  border-top: 1px solid #ddd;
  padding: 8px;
}

.chat-input-area input,
.chat-input-area textarea {
  flex: 1;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid #ccc;
  font-size: 14px;
  resize: none;
  font-family: inherit;
}

.chat-input-area button {
  background-color: #4caf50;
  color: white;
  border: none;
  margin-left: 8px;
  padding: 0 16px;
  border-radius: 10px;
  cursor: pointer;
}

/* MESSAGE BUBBLES */
.chat-message {
  padding: 10px 14px;
  border-radius: 16px;
  max-width: 75%;
  font-size: 14px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.08);
  white-space: pre-wrap;
  word-break: break-word;
}

.chat-message.user {
  align-self: flex-end;
  background-color: #dcf8c6;
  text-align: right;
}

.chat-message.ai {
  align-self: flex-start;
  background-color: #f1f0f0;
  text-align: left;
}

/* RESPONSIVE */
@media (max-width: 768px) {
  table,
  thead,
  tbody,
  th,
  td,
  tr {
    display: block;
  }

  th {
    position: sticky;
    top: 0;
    background: #3498db;
  }

  td {
    position: relative;
    padding-left: 50%;
    text-align: left;
  }

  td::before {
    content: attr(data-label);
    position: absolute;
    left: 10px;
    font-weight: bold;
    color: #555;
    white-space: nowrap;
  }

  .chatbot-widget {
    width: 90%;
    right: 5%;
    bottom: 20px;
  }
}

/* PRINT */
@media print {
  #exportBtn,
  #addRowBtn,
  .remove-btn,
  h3,
  th:last-child,
  td:last-child,
  #aiInput,
  #aiGenerateBtn,
  .chatbot-widget {
    display: none !important;
  }

  body {
    background: white;
  }

  table {
    box-shadow: none;
    border-radius: 0;
  }

  td,
  th {
    font-size: 12pt;
  }

  #note {
    border: none;
  }
}

/* ANIMATIONS */
@keyframes fadeIn {
  from { opacity: 0 }
  to { opacity: 1 }
}

@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInBody {
  0% {
    opacity: 0;
    filter: blur(10px);
  }
  100% {
    opacity: 1;
    filter: blur(0);
  }
}

/* Animation chung */
* {
  transition: background-color 0.4s ease, color 0.4s ease, box-shadow 0.4s ease, transform 0.3s ease;
}