body {
  margin: 0;
  height: 100vh;
  background: #141414;
  color: #e9ecf5;
  font-family: "Inter", "Poppins", sans-serif;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

.vault-container {
  backdrop-filter: blur(20px);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 22px;
  padding: 35px 30px;
  width: 100%;
  max-width: 440px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.6);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all 0.3s ease;
}

.vault-container:hover {
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 8px 50px rgba(0, 0, 0, 0.7);
}

.vault-container h1 {
  font-size: 1.6rem;
  font-weight: 600;
  color: #fcfcfc;
  text-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
  letter-spacing: 0.8px;
  margin-bottom: 8px;
}

.chatbox {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 14px;
  height: 340px;
  padding: 14px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scroll-behavior: smooth;
  transition: background 0.3s ease;
}

.chatbox::-webkit-scrollbar {
  width: 6px;
}

.chatbox::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.15);
  border-radius: 6px;
}

.user-message,
.bot-message {
  padding: 10px 14px;
  border-radius: 14px;
  max-width: 85%;
  word-wrap: break-word;
  font-size: 0.9rem;
  line-height: 1.5;
  animation: fadeUp 0.3s ease;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.user-message {
  background: rgba(255, 255, 255, 0.1);
  color: #fcfcfc;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(4px);
}

.bot-message {
  background: rgba(255, 255, 255, 0.08);
  color: #e2e6f3;
  align-self: flex-start;
  border-bottom-left-radius: 4px;
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.06);
}

.input-area {
  position: relative;
  width: 100%;
  display: flex;
  align-items: center;
  margin-top: 10px;
}

#userInput {
  width: 100%;
  padding: 12px 48px 12px 16px; /* space for button */
  border: none;
  border-radius: 30px;
  background: rgba(255, 255, 255, 0.08);
  color: #fcfcfc;
  font-size: 15px;
  outline: none;
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.1);
}

#sendBtn {
  all: unset;
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.25s ease;
  border-radius: 50%;
}

#sendBtn:hover {
  background: rgba(255, 255, 255, 0.08); 
  transform: translateY(-50%) scale(1.08);
}

#sendBtn:active {
  transform: translateY(-50%) scale(0.95);
  background: rgba(255, 255, 255, 0.08);
}

#sendBtn svg {
  width: 22px;
  height: 22px;
  stroke: #ffffff;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  transform: rotate(45deg);
  transition: all 0.25s ease;
}

#sendBtn:hover svg {
  stroke: #111; 
}

#sendBtn:active svg {
  stroke: #000;
}

#sendBtn svg {
  width: 22px;
  height: 22px;
  transform: rotate(45deg);
  transition: fill 0.18s ease, stroke 0.18s ease, transform 0.25s ease;
}

#sendBtn svg path {
  fill: none;
  stroke: #ffffff;
}

#sendBtn:hover svg path,
#sendBtn:active svg path {
  fill: #ffffff;    
  stroke: #ffffff;  
}


.input-area input {
  flex: 1;
  padding: 11px 14px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.08);
  color: #e9ecf5;
  font-size: 0.95rem;
  transition: all 0.25s ease;
}

.input-area input:focus {
  outline: none;
  border-color: #619eff;
  box-shadow: 0 0 8px rgba(90, 157, 248, 0.4);
  background: rgba(255, 255, 255, 0.12);
}

button {
  background: linear-gradient(135deg, #2b2b2b, #1a1a1a);
  color: #fcfcfc;
  border: none;
  border-radius: 12px;
  padding: 10px 15px;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.25s ease;
  font-weight: 500;
}

button:hover {
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}

button:active {
  transform: scale(0.97);
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.2);
}

.fab-container {
  position: fixed;
  bottom: 25px;
  right: 25px;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 10px;
  z-index: 200;
}

.fab-main {
  background: linear-gradient(145deg, #5a9df8, #3268f5);
  border: none;
  border-radius: 50%;
  width: 56px;
  height: 56px;
  color: #fff;
  font-size: 1.4rem;
  display: flex;
  justify-content: center;
  align-items: center;
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.4);
  transition: all 0.3s ease;
}

.fab-main:hover {
  transform: rotate(45deg);
  box-shadow: 0 8px 30px rgba(90, 157, 248, 0.5);
}

.fab-options {
  display: none;
  flex-direction: column;
  gap: 10px;
}

.fab-options button {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.08);
  color: #d5dbff;
  font-size: 1.2rem;
  cursor: pointer;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.25);
  transition: all 0.25s ease;
}

.fab-options button:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
}

.popup {
  position: fixed;
  inset: 0;
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 100;
  background: rgba(10, 10, 15, 0.6);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  animation: fadeIn 0.25s ease-in-out;
}

.popup-content {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  padding: 32px 26px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.6);
  display: flex;
  flex-direction: column;
  gap: 16px;
  color: #f1f2f6;
  transition: all 0.3s ease;
}

.popup-content h2 {
  text-align: center;
  font-size: 1.3rem;
  color: #ffffff;
  font-weight: 600;
  text-shadow: 0 0 8px rgba(255, 255, 255, 0.08);
}

.popup-content input,
.popup-content textarea {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 12px;
  padding: 10px 12px;
  font-size: 0.9rem;
  color: #eaeaea;
  resize: none;
  transition: all 0.25s ease;
}

.popup-content input:focus,
.popup-content textarea:focus {
  outline: none;
  border-color: rgba(90, 157, 248, 0.4);
  box-shadow: 0 0 8px rgba(90, 157, 248, 0.3);
  background: rgba(255, 255, 255, 0.12);
}

.popup-content label {
  font-size: 0.85rem;
  color: #c9cce2;
  margin-top: 4px;
}

.popup-actions {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 10px;
}

.popup-actions button {
  flex: 1;
  padding: 10px 0;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: #f1f1f1;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.25s ease;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(8px);
}

.popup-actions button:hover {
  background: rgba(90, 157, 248, 0.15);
  border-color: rgba(90, 157, 248, 0.4);
  box-shadow: 0 0 14px rgba(90, 157, 248, 0.35);
  transform: translateY(-2px);
}

.popup-actions button:active {
  transform: scale(0.96);
  background: rgba(90, 157, 248, 0.25);
  box-shadow: 0 0 10px rgba(90, 157, 248, 0.25);
  border-color: rgba(90, 157, 248, 0.4);
}


.typing-indicator {
  display: none;
  align-self: flex-start;
  background: rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 10px 14px;
  margin-top: 6px;
  width: 60px;
  justify-content: space-around;
  box-shadow: 0 0 8px rgba(100, 150, 255, 0.3);
}

.typing-indicator span {
  width: 8px;
  height: 8px;
  background: #5a9df8;
  border-radius: 50%;
  opacity: 0.6;
  animation: typingBlink 1.3s infinite ease-in-out;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes typingBlink {
  0%, 80%, 100% { opacity: 0.3; transform: scale(1); }
  40% { opacity: 1; transform: scale(1.2); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

@media (max-width: 500px) {
  .vault-container {
    width: 92%;
    padding: 24px 20px;
  }
  .popup-content {
    max-width: 92%;
  }
}

.vault-toolbar {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 10px;
  padding: 8px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
}

.vault-toolbar button {
  background: rgba(255, 255, 255, 0.08);
  color: #fcfcfc;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 10px;
  padding: 8px 16px;
  font-size: 0.85rem;
  cursor: pointer;
  transition: all 0.25s ease;
  font-weight: 500;
}

.vault-toolbar button:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fcfcfc;
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}

.vault-toolbar button:active {
  transform: scale(0.96);
}

/* Typing animation */
.typing {
  display: flex;
  gap: 4px;
  padding: 8px;
  align-items: center;
}
.typing span {
  width: 6px;
  height: 6px;
  background: #9cbcff;
  border-radius: 50%;
  animation: blink 1.3s infinite ease-in-out;
}
.typing span:nth-child(2) {
  animation-delay: 0.2s;
}
.typing span:nth-child(3) {
  animation-delay: 0.4s;
}
@keyframes blink {
  0%, 80%, 100% { opacity: 0.3; transform: scale(0.8); }
  40% { opacity: 1; transform: scale(1); }
}

/* Toast Notifications */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: rgba(20, 25, 45, 0.8);
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  opacity: 0;
  transform: translateY(10px);
  transition: all 0.3s ease;
  font-size: 0.85rem;
  backdrop-filter: blur(6px);
  z-index: 9999;
  border: 1px solid rgba(255, 255, 255, 0.08);
}
.toast.show {
  opacity: 1;
  transform: translateY(0);
}
.toast.success { border-color: rgba(50, 255, 140, 0.4); }
.toast.error { border-color: rgba(255, 80, 80, 0.5); }

.chatbox img {
  box-shadow: 0 0 8px rgba(255, 255, 255, 0.1);
  transition: transform 0.3s ease;
}
.chatbox img:hover {
  transform: scale(1.05);
}

.file-download-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  align-self: flex-start;
  margin-top: 8px;
  padding: 6px 12px;
  border-radius: 10px;
  border: 1px solid rgba(8, 9, 12, 0.4);
  background: rgba(255, 255, 255, 0.08);
  color: rgb(252, 252, 252);
  font-size: 0.82rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.2s ease;
}

.file-download-link:hover {
  background: rgba(255, 255, 255, 0.15);
  color: #fcfcfc;
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.25);
  transform: translateY(-1px);
}

.popup-actions {
  display: flex;
  justify-content: space-between; /* puts buttons at ends */
  gap: 12px; /* space between buttons */
  margin-top: 12px;
}

.popup-actions button {
  flex: 1; /* buttons take equal width */
  padding: 10px 0;
}

#addDocBtn {
  all: unset;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-right: 8px;
  cursor: pointer;
  transition: all 0.25s ease;
}

#addDocBtn:hover {
  background: rgba(90, 157, 248, 0.15);
  border-color: rgba(90, 157, 248, 0.4);
  box-shadow: 0 0 10px rgba(90, 157, 248, 0.3);
  transform: translateY(-1px);
}

#addDocBtn:active {
  transform: scale(0.95);
  background: rgba(90, 157, 248, 0.25);
  box-shadow: 0 0 8px rgba(90, 157, 248, 0.25);
}

.edit-doc-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.edit-doc-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 12px 14px;
  border-radius: 14px;
  color: #fff;
  backdrop-filter: blur(10px);
}

.edit-doc-item:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.18);
}

.edit-buttons {
  display: flex;
  gap: 10px;
}

.edit-btn,
.delete-btn {
  padding: 6px 12px;
  border-radius: 10px;
  font-size: 0.78rem;
  cursor: pointer;
  transition: 0.25s ease;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.edit-btn {
  background: rgba(80, 150, 255, 0.15);
}

.edit-btn:hover {
  background: rgba(80, 150, 255, 0.3);
}

.delete-btn {
  background: rgba(255, 70, 70, 0.15);
}

.delete-btn:hover {
  background: rgba(255, 70, 70, 0.3);
}

/* EXPORT BUTTON */
#exportBtn {
  background: rgba(50, 255, 140, 0.15);
  border: 1px solid rgba(50, 255, 140, 0.25);
}

#exportBtn:hover {
  background: rgba(50, 255, 140, 0.35);
  border-color: rgba(50, 255, 140, 0.55);
  box-shadow: 0 0 12px rgba(50, 255, 140, 0.45);
  transform: translateY(-2px);
}

#clearBtn {
  background: rgba(255, 70, 70, 0.15);
  border: 1px solid rgba(255, 70, 70, 0.25);
}

#clearBtn:hover {
  background: rgba(255, 70, 70, 0.35);
  border-color: rgba(255, 70, 70, 0.55);
  box-shadow: 0 0 12px rgba(255, 70, 70, 0.45);
  transform: translateY(-2px);
}

#importBtn {
  background: rgba(80, 140, 255, 0.15);
  border: 1px solid rgba(80, 140, 255, 0.25);
}

#importBtn:hover {
  background: rgba(80, 140, 255, 0.35);
  border-color: rgba(80, 140, 255, 0.55);
  box-shadow: 0 0 12px rgba(80, 140, 255, 0.45);
  transform: translateY(-2px);
}

#closeEditPopup {
  background: rgba(255, 170, 60, 0.15);
  border: 1px solid rgba(255, 170, 60, 0.25);
}

#closeEditPopup:hover {
  background: rgba(255, 170, 60, 0.35);
  border-color: rgba(255, 170, 60, 0.55);
  box-shadow: 0 0 12px rgba(255, 170, 60, 0.45);
  transform: translateY(-2px);
}

#editPopup {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

#editPopup .popup-content {
  max-height: 340px;
  overflow-y: auto;
}

.edit-actions {
  width: 100%;
  max-width: 400px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 12px;
  background: rgba(255, 255, 255, 0.05);
  padding: 12px;
  border-radius: 14px;
  border: 1px solid rgba(255,255,255,0.1);
  backdrop-filter: blur(14px);
}

.edit-actions button {
  flex: 1;
  padding: 10px 0;
  border-radius: 12px;
}

.about-popup {
  position: fixed;
  inset: 0;
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 200;
  background: rgba(10, 10, 15, 0.60);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  animation: fadeIn 0.25s ease;
}

.about-box {
  position: relative;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.10);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  border-radius: 20px;
  padding: 28px 24px;
  width: 100%;
  max-width: 420px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.6);
  text-align: center;
  color: #f1f2f6;
  display: flex;
  flex-direction: column;
  gap: 16px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.25) transparent;
}

.about-box::-webkit-scrollbar {
  width: 6px;
}

.about-box::-webkit-scrollbar-thumb {
  background: rgba(255,255,255,0.25);
  border-radius: 10px;
}

.about-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: #ffffff;
  text-shadow: 0 0 8px rgba(255,255,255,0.10);
  margin: 0;
}

.about-logo {
  width: 84px;
  height: 84px;
  object-fit: cover;
  margin: 6px auto;
  border-radius: 16px;
  border: 1px solid rgba(255,255,255,0.10);
  box-shadow: 0 6px 22px rgba(0,0,0,0.60);
}

.about-desc {
  margin-bottom: 0px;
  font-size: 0.95rem;
  color: #e6e9f3;
  line-height: 1.45;
  opacity: 0.95;
}

.about-version {
  margin-top: 0;
  margin-bottom: -5px;
  font-size: 0.84rem;
  color: #cbd0e3;
  opacity: 0.80;
}

.about-links-row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
}

.about-links-row a {
  flex: 1;
  text-align: center;
  padding: 10px 0;
  border-radius: 12px;
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.12);
  color: #6aa9ff;
  font-weight: 600;
  text-decoration: none;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: all .18s ease;
}

.about-links-row a:hover {
  background: rgba(255,255,255,0.14);
  transform: translateY(-2px);
}

.about-dev {
  opacity: 0.85;
  font-size: 0.87rem;
  color: #cfd2e2;
  margin-top: 4px;
  margin-bottom: -14px;
}

.about-close-btn {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.07);
  border-radius: 10px;
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  color: #ffffff;
  font-size: 18px;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: 0.2s ease;
  z-index: 5;
}

.about-close-btn:hover {
  background: rgba(255, 40, 40, 0.25);
  border-color: rgba(255, 60, 60, 0.40);
  color: #ff4b4b;
  transform: translateY(-2px);
  box-shadow: 0 0 14px rgba(255, 50, 50, 0.35);
}

@media (max-width: 520px) {
  .about-box { max-width: 92%; padding: 24px; }
  .about-logo { width: 70px; height: 70px; }
  .about-details div { max-height: 180px; }
}

.changelog-box-inner {
  padding: 14px;
  max-height: 68vh;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
  text-align: left;
}

/* compact center heading */
.changelog-box-inner h2.about-title {
  text-align: center;
  margin: 4px 0;
  padding: 0;
  line-height: 1.1;
  font-size: 1.2rem;
  font-weight: 600;
}

#changelogBody {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 12px;
  padding: 12px;
  max-height: 52vh;
  overflow-y: auto;
  color: #e5e7f3;
  white-space: normal;
}

/* markdown headings */
#changelogBody h1,
#changelogBody h2,
#changelogBody h3 {
  color: #fff;
  font-weight: 600;
}

#changelogBody h2 {
  margin: 4px 0;
  padding: 0;
  text-align: center;
}

/* text */
#changelogBody p {
  margin: 4px 0;
  color: #e5e7f3;
}

/* list spacing */
#changelogBody ul,
#changelogBody ol {
  margin: 14px 0 14px 22px !important;
  padding: 0;
}

#changelogBody li {
  margin: 4px 0 !important;
}


/* code blocks */
#changelogBody code,
#changelogBody pre {
  background: rgba(0,0,0,0.55);
  color: #dfe6ff;
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid rgba(255,255,255,0.05);
  font-size: .82rem;
}

#changelogBody ul + ul,
#changelogBody ol + ol,
#changelogBody ul + ol,
#changelogBody ol + ul {
  margin-top: 10px;
}

#changelogBody table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0;
  font-size: 0.9rem;
}

#changelogBody th,
#changelogBody td {
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 6px 10px;
  text-align: left;
  vertical-align: top;
}

#changelogBody th {
  background: rgba(255, 255, 255, 0.1);
  font-weight: 600;
}

#changelogBody tr:nth-child(even) {
  background: rgba(255, 255, 255, 0.03);
}

#changelogBody tr:hover {
  background: rgba(255, 255, 255, 0.08);
}

#changelogBody td code {
  background: rgba(0,0,0,0.55);
  padding: 4px 6px;
  border-radius: 6px;
  font-size: 0.82rem;
}

#changelogBody a {
  color: #99c3ff; 
}

#changelogBody a:hover {
  color: #c58af9; 
}

#imgModal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(12px);
  justify-content: center;
  align-items: center;
  z-index: 99999;
}

#imgModalContent {
  max-width: 90%;
  max-height: 90%;
  border-radius: 14px;
  box-shadow: 0 0 20px rgba(0, 0, 0, 0.6);
  animation: zoomIn 0.15s ease-out;
}

/* animation */
@keyframes zoomIn {
  from {
    transform: scale(0.85);
    opacity: 0;
  }
  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* -------- PDF MODAL -------- */
#pdfModal {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.65);
  backdrop-filter: blur(12px);
  justify-content: center;
  align-items: center;
  z-index: 99999;
}

#pdfModalViewer {
  width: 90%;
  height: 90%;
  border: none;
  border-radius: 12px;
  box-shadow: 0 0 20px rgba(0,0,0,0.6);
}

#helpPopup {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(6px);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 9999;
}

.help-box {
  width: 92vw;
  max-width: 720px;
  max-height: 85vh;
  background: rgba(20, 25, 45, 0.55);
  backdrop-filter: blur(18px);
  border: 1px solid rgba(130, 160, 255, 0.25);
  border-radius: 18px;
  box-shadow: 0 0 25px rgba(80, 120, 255, 0.25);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.help-header {
  padding: 12px 16px;
  font-size: 18px;
  font-weight: 600;
  color: #ffffff;
  border-bottom: 1px solid rgba(120, 160, 255, 0.2);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#helpBody {
  padding: 16px;
  overflow-y: auto;
  overflow-x: hidden;
  color: #ffffff;
  font-size: 14px;
  line-height: 1.6;
  word-wrap: break-word;
  overflow-wrap: break-word;
}

#helpBody h1,
#helpBody h2,
#helpBody h3 {
  color: #ffffff;
  margin-top: 14px;
}

#helpBody p {
  opacity: 0.95;
}

#helpBody ul,
#helpBody ol {
  padding-left: 18px;
}

#helpBody li {
  margin-bottom: 6px;
}

#helpBody img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: 12px auto;
  border-radius: 12px;
  border: 1px solid rgba(120, 160, 255, 0.3);
  box-shadow: 0 0 12px rgba(255, 255, 255, 0.25);
}

#helpBody pre {
  background: rgba(0, 0, 0, 0.4);
  padding: 10px;
  border-radius: 10px;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-word;
  margin-top: 10px;
  box-shadow: inset 0 0 8px rgba(100, 140, 255, 0.15);
}

#helpBody code {
  color: #ffffff;
}

#helpBody::-webkit-scrollbar {
  width: 6px;
}

#helpBody::-webkit-scrollbar-thumb {
  background: rgba(120, 160, 255, 0.35);
  border-radius: 20px;
}

#helpBody h1, #helpBody h2, #helpBody h3 {
  color: #ffffff;
  margin: 6px 0; /* reduce vertical spacing */
}

#helpBody p { margin: 4px 0; }
#helpBody ul, #helpBody ol { margin: 4px 0; padding-left: 18px; }
#helpBody li { margin-bottom: 4px; }
#helpBody pre { margin: 6px 0; }

hr {
  border: none;
  border-top: 2px solid #212224; 
  margin: 16px 0;
  height: 2px;
}

#updatePopup .popup-content {
  max-width: 380px;
  text-align: center;
  padding: 28px 22px;
}
#updatePopup h2 {
  font-size: 1.4rem;
  color: #6ab7ff;
  margin-bottom: 10px;
}
#updatePopup p {
  font-size: 0.94rem;
  color: #e1e7f8;
  margin-bottom: 14px;
}
#updatePopup .popup-actions button {
  background: rgba(60, 110, 200, 0.15);
  border: 1px solid rgba(60, 110, 200, 0.4);
  color: #9abfff;
}
#updatePopup .popup-actions button:hover {
  background: rgba(60, 110, 200, 0.24);
  color: #fff;
}

/* Professional UI refresh */
:root {
  color-scheme: dark;
  --bg: #0f172a;
  --bg-2: #111827;
  --surface: rgba(15, 23, 42, 0.84);
  --surface-strong: rgba(17, 24, 39, 0.94);
  --surface-soft: rgba(30, 41, 59, 0.72);
  --line: rgba(148, 163, 184, 0.22);
  --line-strong: rgba(148, 163, 184, 0.36);
  --text: #f8fafc;
  --muted: #94a3b8;
  --muted-strong: #cbd5e1;
  --primary: #38bdf8;
  --primary-2: #2563eb;
  --accent: #a78bfa;
  --success: #22c55e;
  --danger: #ef4444;
  --warning: #f59e0b;
  --shadow: 0 24px 80px rgba(2, 6, 23, 0.52);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  height: auto;
  padding: 24px;
  background:
    radial-gradient(circle at top left, rgba(56, 189, 248, 0.18), transparent 34%),
    radial-gradient(circle at bottom right, rgba(167, 139, 250, 0.16), transparent 32%),
    linear-gradient(135deg, var(--bg), #020617 78%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.vault-container {
  position: relative;
  width: min(100%, 520px);
  max-width: 520px;
  padding: 26px;
  gap: 18px;
  overflow: hidden;
  background: linear-gradient(180deg, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.76));
  border: 1px solid var(--line);
  border-radius: 28px;
  box-shadow: var(--shadow), inset 0 1px 0 rgba(255, 255, 255, 0.06);
  text-align: left;
}

.vault-container::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.16), transparent 34%, rgba(167, 139, 250, 0.12));
  opacity: 0.9;
}

.vault-container > * {
  position: relative;
  z-index: 1;
}

.vault-container:hover {
  border-color: var(--line-strong);
  box-shadow: 0 28px 90px rgba(2, 6, 23, 0.62), inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.app-header {
  display: flex;
  align-items: center;
  gap: 16px;
}

.brand-mark {
  width: 58px;
  height: 58px;
  flex: 0 0 58px;
  display: grid;
  place-items: center;
  border-radius: 18px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2) 55%, var(--accent));
  color: white;
  font-weight: 800;
  letter-spacing: -0.04em;
  box-shadow: 0 16px 34px rgba(37, 99, 235, 0.36);
}

.brand-copy {
  min-width: 0;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--primary);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.vault-container h1 {
  margin: 0;
  color: var(--text);
  font-size: clamp(1.75rem, 5vw, 2.35rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  line-height: 1;
  text-shadow: none;
}

.app-subtitle {
  margin: 8px 0 0;
  color: var(--muted-strong);
  font-size: 0.92rem;
  line-height: 1.45;
}

.vault-toolbar {
  justify-content: flex-start;
  gap: 8px;
  margin: 0;
  padding: 8px;
  background: rgba(15, 23, 42, 0.64);
  border-color: var(--line);
  border-radius: 16px;
}

button,
.vault-toolbar button,
.popup-actions button,
.edit-actions button {
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(51, 65, 85, 0.9), rgba(30, 41, 59, 0.9));
  color: var(--text);
  border-radius: 12px;
  font-weight: 700;
  letter-spacing: -0.01em;
  box-shadow: 0 8px 18px rgba(2, 6, 23, 0.22);
}

button:hover,
.vault-toolbar button:hover,
.popup-actions button:hover,
.edit-actions button:hover {
  border-color: rgba(56, 189, 248, 0.58);
  background: linear-gradient(180deg, rgba(14, 165, 233, 0.24), rgba(37, 99, 235, 0.18));
  box-shadow: 0 12px 28px rgba(14, 165, 233, 0.18);
  color: #ffffff;
}

.chatbox {
  position: relative;
  height: min(46vh, 380px);
  min-height: 320px;
  padding: 18px;
  background: rgba(2, 6, 23, 0.44);
  border-color: var(--line);
  border-radius: 22px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.empty-state {
  margin: auto;
  max-width: 280px;
  align-self: center;
  text-align: center;
  color: var(--muted);
  line-height: 1.45;
}

.empty-icon {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  margin-bottom: 10px;
  border-radius: 14px;
  background: rgba(56, 189, 248, 0.1);
  color: var(--primary);
  border: 1px solid rgba(56, 189, 248, 0.24);
}

.empty-state strong {
  display: block;
  color: var(--text);
  font-size: 1rem;
}

.empty-state p {
  margin: 6px 0 0;
  font-size: 0.88rem;
}

.chatbox:has(.user-message) .empty-state,
.chatbox:has(.bot-message) .empty-state,
.chatbox:has(.typing) .empty-state {
  display: none;
}

.user-message,
.bot-message {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  padding: 12px 14px;
  font-size: 0.94rem;
  line-height: 1.55;
  box-shadow: 0 12px 26px rgba(2, 6, 23, 0.22);
}

.user-message {
  background: linear-gradient(135deg, var(--primary-2), #0ea5e9);
  color: white;
  border-bottom-right-radius: 6px;
}

.bot-message,
.typing,
.typing-indicator {
  background: rgba(30, 41, 59, 0.86);
  color: var(--muted-strong);
  border-bottom-left-radius: 6px;
}

.input-area {
  gap: 10px;
  margin-top: 0;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: rgba(2, 6, 23, 0.42);
}

#userInput,
.input-area input {
  min-height: 46px;
  padding: 0 54px 0 16px;
  border: 1px solid transparent;
  border-radius: 16px;
  background: rgba(15, 23, 42, 0.76);
  color: var(--text);
  box-shadow: none;
}

#userInput::placeholder,
.popup-content input::placeholder,
.popup-content textarea::placeholder {
  color: #64748b;
}

.input-area input:focus,
.popup-content input:focus,
.popup-content textarea:focus {
  border-color: rgba(56, 189, 248, 0.58);
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.12);
  background: rgba(15, 23, 42, 0.96);
}

#addDocBtn {
  width: 46px;
  height: 46px;
  flex: 0 0 46px;
  margin-right: 0;
  background: rgba(15, 23, 42, 0.82);
  border-color: var(--line);
}

#sendBtn {
  right: 14px;
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2));
  box-shadow: 0 10px 20px rgba(37, 99, 235, 0.28);
}

#sendBtn:hover {
  background: linear-gradient(135deg, #7dd3fc, var(--primary-2));
}

.popup,
.about-popup,
#helpPopup,
#imgModal,
#pdfModal {
  background: rgba(2, 6, 23, 0.74);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
}

.popup-content,
.about-box,
.edit-actions {
  background: var(--surface-strong);
  border-color: var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  color: var(--text);
}

.popup-content h2,
.about-title,
#changelogBody h1,
#changelogBody h2,
#changelogBody h3,
#helpBody h1,
#helpBody h2,
#helpBody h3 {
  color: var(--text);
  text-shadow: none;
  letter-spacing: -0.03em;
}

.popup-content input,
.popup-content textarea,
#changelogBody,
.edit-doc-item,
#helpBody pre {
  background: rgba(15, 23, 42, 0.72);
  border-color: var(--line);
  color: var(--text);
}

.about-links-row a,
.file-download-link {
  color: #7dd3fc;
  border-color: rgba(56, 189, 248, 0.22);
  background: rgba(56, 189, 248, 0.08);
}

#exportBtn { border-color: rgba(34, 197, 94, 0.35); background: rgba(34, 197, 94, 0.14); }
#importBtn { border-color: rgba(56, 189, 248, 0.35); background: rgba(56, 189, 248, 0.14); }
#clearBtn { border-color: rgba(239, 68, 68, 0.36); background: rgba(239, 68, 68, 0.14); }
#closeEditPopup { border-color: rgba(245, 158, 11, 0.36); background: rgba(245, 158, 11, 0.14); }

.toast {
  background: rgba(15, 23, 42, 0.94);
  border-color: var(--line);
  border-radius: 14px;
  box-shadow: 0 16px 36px rgba(2, 6, 23, 0.34);
}

@media (max-width: 560px) {
  body {
    padding: 14px;
    align-items: stretch;
  }

  .vault-container {
    width: 100%;
    min-height: calc(100vh - 28px);
    padding: 20px;
    border-radius: 24px;
  }

  .app-header {
    align-items: flex-start;
  }

  .brand-mark {
    width: 50px;
    height: 50px;
    flex-basis: 50px;
  }

  .vault-toolbar,
  .edit-actions,
  .about-links-row {
    flex-wrap: wrap;
  }

  .vault-toolbar button,
  .edit-actions button,
  .about-links-row a {
    flex: 1 1 auto;
  }

  .chatbox {
    min-height: 360px;
    height: auto;
    flex: 1;
  }
}

.chatbox.has-messages .empty-state {
  display: none;
}