* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: 'Segoe UI', Roboto, Arial, sans-serif;
  background: linear-gradient(135deg, #f5f7fb, #e9eefc);
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  overflow-x: hidden;
}

.screen {
  width: 100%;
  max-width: 480px;
}

#setup-screen {
  max-width: 520px;
  max-height: 92vh;
  max-height: 92dvh;
  overflow-y: auto;
}

/* ---- mobile ---- */
@media (max-width: 600px) {
  body {
    padding: 0;
    align-items: stretch;
    min-height: 100vh;
    min-height: 100dvh;
  }

  .screen {
    max-width: 100%;
  }

  #setup-screen {
    max-width: 100%;
    max-height: none;
    min-height: 100vh;
    min-height: 100dvh;
  }

  .card {
    border-radius: 0;
    min-height: 100vh;
    min-height: 100dvh;
    padding: 24px 18px;
  }

  #chat-screen {
    max-width: 100%;
    height: 100vh;
    height: 100dvh;
    border-radius: 0;
  }

  .msg {
    max-width: 90%;
  }

  input[type="text"],
  input[type="password"],
  #question-input {
    font-size: 16px; /* prevents iOS Safari from auto-zooming on focus */
  }

  .app-header,
  .admin-header {
    flex-wrap: wrap;
  }

  .section-row {
    flex-wrap: wrap;
  }
}

.hidden {
  display: none !important;
}

/* ---- setup screen ---- */
.card {
  background: #fff;
  border-radius: 16px;
  padding: 32px 28px;
  box-shadow: 0 10px 30px rgba(30, 40, 90, 0.12);
}

.card h1 {
  margin: 0 0 4px;
  font-size: 24px;
  color: #2b2f66;
}

.subtitle {
  margin: 0 0 20px;
  color: #666;
  font-size: 14px;
}

label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: #444;
  margin: 14px 0 6px;
}

input[type="text"],
input[type="password"] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #d5d9ea;
  border-radius: 10px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.15s;
}

input[type="text"]:focus,
input[type="password"]:focus {
  border-color: #6c7ae0;
}

button {
  cursor: pointer;
  border: none;
  border-radius: 10px;
  font-weight: 600;
  font-size: 14px;
}

#start-btn {
  margin-top: 22px;
  width: 100%;
  padding: 12px;
  background: #6c7ae0;
  color: #fff;
}

#start-btn:hover {
  background: #5a68d1;
}

.error {
  color: #d64545;
  font-size: 13px;
  min-height: 18px;
  margin-top: 10px;
}

.success {
  color: #2a9d5c;
  font-size: 13px;
  min-height: 18px;
  margin-top: 10px;
}

.app-header,
.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 8px;
}

.header-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.secondary-btn {
  background: #eef0fb;
  color: #4a5199;
  padding: 8px 12px;
  font-size: 13px;
}

.secondary-btn:hover {
  background: #dfe3f8;
}

.admin-card {
  max-width: 520px;
}

.section-title {
  margin: 24px 0 8px;
  font-size: 16px;
  color: #2b2f66;
}

.section-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-top: 24px;
}

.section-row .section-title {
  margin: 0 0 8px;
}

.section-row .secondary-btn {
  margin-bottom: 8px;
  white-space: nowrap;
}

.user-list {
  list-style: none;
  padding: 0;
  margin: 8px 0 0;
}

.user-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 12px;
  border: 1px solid #e3e6f3;
  border-radius: 10px;
  margin-bottom: 8px;
  font-size: 14px;
  gap: 10px;
  flex-wrap: wrap;
}

.user-item-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.user-item-name {
  font-weight: 600;
  color: #2b2f66;
}

.user-item-tokens {
  font-size: 12px;
  color: #777;
}

.user-item-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

/* ---- mode selector ---- */
.mode-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-top: 6px;
}

.mode-option {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid #d5d9ea;
  border-radius: 10px;
  cursor: pointer;
  font-weight: normal;
  margin: 0;
  transition: border-color 0.15s, background 0.15s;
}

.mode-option:has(input:checked) {
  border-color: #6c7ae0;
  background: #f2f3fd;
}

.mode-option input[type="radio"] {
  margin-top: 3px;
  flex-shrink: 0;
}

.mode-option span {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mode-option strong {
  font-size: 14px;
  color: #2b2f66;
}

.mode-option small {
  font-size: 12px;
  color: #777;
}

/* ---- login / signup switch link ---- */
.switch-link {
  margin: 16px 0 0;
  font-size: 13px;
  color: #666;
  text-align: center;
}

.switch-link a {
  color: #6c7ae0;
  font-weight: 600;
  text-decoration: none;
}

.switch-link a:hover {
  text-decoration: underline;
}

.empty-item {
  color: #888;
  font-size: 14px;
  padding: 8px 0;
}

.welcome-user {
  margin: 6px 0 0;
  color: #4a5199;
  font-size: 13px;
  font-weight: 600;
}

/* ---- token usage bar ---- */
.usage-bar {
  margin-top: 10px;
}

.usage-bar-track {
  width: 100%;
  height: 8px;
  background: #eef0fb;
  border-radius: 6px;
  overflow: hidden;
}

.usage-bar-fill {
  height: 100%;
  width: 0%;
  background: #6c7ae0;
  border-radius: 6px;
  transition: width 0.3s ease, background 0.3s ease;
}

.usage-bar-fill.usage-warn {
  background: #e0a83c;
}

.usage-bar-fill.usage-critical {
  background: #d64545;
}

.usage-bar-text {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: #777;
}

.usage-bar-chat {
  padding: 8px 20px 0;
  background: #fff;
}

.history-hint {
  margin: 0 0 10px;
  color: #777;
  font-size: 13px;
}

.history-list {
  list-style: none;
  padding: 0;
  margin: 0;
  max-height: 260px;
  overflow-y: auto;
}

.history-item {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 10px;
  padding: 12px;
  border: 1px solid #e3e6f3;
  border-radius: 12px;
  margin-bottom: 8px;
  background: #f8f9ff;
}

.history-item-main {
  min-width: 0;
  flex: 1;
}

.history-item-title {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: #2b2f66;
}

.history-item-meta,
.history-item-preview {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: #777;
}

.history-item-preview {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-item-actions {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex-shrink: 0;
}

.open-chat-btn {
  background: #6c7ae0;
  color: #fff;
  padding: 6px 10px;
  font-size: 12px;
}

.open-chat-btn:hover {
  background: #5a68d1;
}

.remove-btn {
  background: #ffe8e8;
  color: #c0392b;
  padding: 6px 10px;
  font-size: 12px;
}

.remove-btn:hover {
  background: #ffd4d4;
}

#add-user-btn {
  margin-top: 16px;
  width: 100%;
  padding: 12px;
  background: #6c7ae0;
  color: #fff;
}

#add-user-btn:hover {
  background: #5a68d1;
}

#login-btn,
#signup-btn {
  margin-top: 22px;
  width: 100%;
  padding: 12px;
  background: #6c7ae0;
  color: #fff;
}

#login-btn:hover,
#signup-btn:hover {
  background: #5a68d1;
}

/* ---- chat screen ---- */
#chat-screen {
  max-width: 560px;
  height: 640px;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(30, 40, 90, 0.12);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.chat-header {
  padding: 16px 20px;
  background: #6c7ae0;
  color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.chat-subtitle {
  font-size: 12px;
  opacity: 0.85;
}

#reset-btn,
#history-btn,
#download-chat-btn {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
  padding: 6px 12px;
}

#reset-btn:hover,
#history-btn:hover,
#download-chat-btn:hover {
  background: rgba(255, 255, 255, 0.35);
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: #f7f8fc;
}

.msg {
  max-width: 80%;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.4;
  white-space: pre-wrap;
}

.msg.user {
  align-self: flex-end;
  background: #6c7ae0;
  color: #fff;
  border-bottom-right-radius: 4px;
}

.msg-image {
  display: block;
  max-width: 220px;
  max-height: 180px;
  border-radius: 10px;
  margin-bottom: 8px;
  object-fit: cover;
}

.msg.user .msg-image {
  border: 1px solid rgba(255, 255, 255, 0.35);
}

.msg.bot {
  align-self: flex-start;
  background: #ecebff;
  color: #2b2f66;
  border-bottom-left-radius: 4px;
}

.msg.bot p {
  margin: 0 0 8px;
}

.msg.bot p:last-child {
  margin-bottom: 0;
}

.msg.bot strong {
  font-weight: 700;
}

.msg.bot em {
  font-style: italic;
}

.msg.bot h3,
.msg.bot h4 {
  margin: 8px 0 4px;
  font-size: 15px;
}

.msg.bot ul {
  margin: 6px 0 8px;
  padding-left: 18px;
}

.msg.bot li {
  margin: 2px 0;
}

.msg.bot code {
  font-family: Consolas, "Courier New", monospace;
  background: rgba(43, 47, 102, 0.08);
  padding: 1px 5px;
  border-radius: 4px;
  font-size: 13px;
}

.msg.bot pre {
  margin: 8px 0;
  padding: 8px 10px;
  background: rgba(43, 47, 102, 0.08);
  border-radius: 8px;
  overflow-x: auto;
}

.msg.bot pre code {
  background: none;
  padding: 0;
}

.msg.system {
  align-self: center;
  background: transparent;
  color: #999;
  font-size: 12px;
}

.input-bar {
  display: flex;
  gap: 8px;
  padding: 14px;
  border-top: 1px solid #eee;
  align-items: flex-end;
}

.composer {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.image-preview {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 8px;
  background: #eef0fb;
  border-radius: 10px;
  font-size: 12px;
  color: #4a5199;
}

.image-preview.hidden {
  display: none !important;
}

.image-preview img {
  width: 40px;
  height: 40px;
  object-fit: cover;
  border-radius: 8px;
}

#preview-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#clear-image-btn {
  background: transparent;
  color: #4a5199;
  font-size: 18px;
  padding: 0 6px;
  line-height: 1;
}

#image-btn {
  background: #eef0fb;
  color: #4a5199;
  padding: 10px 12px;
  flex-shrink: 0;
}

#image-btn:hover {
  background: #dfe3f8;
}

#question-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid #d5d9ea;
  border-radius: 10px;
  font-size: 14px;
  outline: none;
}

#send-btn {
  padding: 10px 18px;
  background: #6c7ae0;
  color: #fff;
}

#send-btn:hover {
  background: #5a68d1;
}

#send-btn:disabled,
#start-btn:disabled,
#login-btn:disabled,
#signup-btn:disabled,
#add-user-btn:disabled,
#image-btn:disabled,
.download-all-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ---- contact line ---- */
.contact-line {
  margin: 18px 0 0;
  font-size: 13px;
  color: #666;
  text-align: center;
}

.contact-line a {
  color: #4a5199;
  font-weight: 600;
  text-decoration: none;
}

.contact-line a:hover {
  text-decoration: underline;
}

/* ---- payment box ---- */
.payment-box {
  margin-top: 18px;
  padding: 14px;
  border: 1px dashed #b9c0ee;
  border-radius: 12px;
  background: #f8f9ff;
  text-align: center;
}

.payment-amount {
  font-size: 15px;
  color: #2b2f66;
  margin-bottom: 10px;
}

.payment-amount strong {
  font-size: 20px;
}

.payment-qr {
  display: block;
  width: 100%;
  max-width: 220px;
  height: auto;
  margin: 0 auto 10px;
  border-radius: 10px;
  background: #fff;
  border: 1px solid #e3e6f3;
}

.payment-qr-missing {
  font-size: 13px;
  color: #c0392b;
  margin: 8px 0;
}

.payment-steps {
  text-align: left;
  margin: 8px 0 0;
  padding-left: 20px;
  font-size: 13px;
  color: #555;
  line-height: 1.5;
}

.payment-box label {
  text-align: left;
}

/* ---- primary button (modal) ---- */
.primary-btn {
  margin-top: 16px;
  width: 100%;
  padding: 12px;
  background: #6c7ae0;
  color: #fff;
}

.primary-btn:hover {
  background: #5a68d1;
}

.primary-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* ---- modal ---- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(20, 24, 60, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  overflow-y: auto;
}

.modal-card {
  position: relative;
  width: 100%;
  max-width: 440px;
  max-height: 94vh;
  max-height: 94dvh;
  overflow-y: auto;
  background: #fff;
  border-radius: 16px;
  padding: 26px 22px;
  box-shadow: 0 10px 30px rgba(30, 40, 90, 0.3);
}

.modal-title {
  margin: 0 0 4px;
  font-size: 20px;
  color: #2b2f66;
}

.modal-close {
  position: absolute;
  top: 10px;
  right: 12px;
  background: transparent;
  color: #777;
  font-size: 24px;
  line-height: 1;
  padding: 2px 8px;
}

/* ---- "pay to renew" link inside usage bar ---- */
.pay-link {
  margin-top: 6px;
  background: #fff3d6;
  color: #8a5a00;
  padding: 6px 12px;
  font-size: 12px;
}

.pay-link:hover {
  background: #ffe9b0;
}

.user-item-meta {
  font-size: 12px;
  color: #777;
}

/* ---- free sign-up: verification steps ---- */
.step-note {
  margin: 4px 0 12px;
  font-size: 14px;
  color: #2b2f66;
  line-height: 1.5;
}

.verify-box {
  padding: 14px;
  border: 1px dashed #b9c0ee;
  border-radius: 12px;
  background: #f8f9ff;
  text-align: center;
  font-size: 14px;
  color: #444;
}

.verify-box p {
  margin: 0 0 10px;
}

.wa-code {
  display: inline-block;
  margin: 2px 0 14px;
  padding: 8px 18px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 2px;
  color: #2b2f66;
  background: #fff;
  border: 1px solid #d5d9ea;
  border-radius: 10px;
  user-select: all;
}

.whatsapp-btn {
  display: block;
  padding: 12px;
  border-radius: 10px;
  background: #25d366;
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  text-decoration: none;
}

.whatsapp-btn:hover {
  background: #1fb857;
}

.verify-box .small-note {
  margin: 12px 0 0;
  font-size: 12px;
  color: #777;
}

#signup-otp {
  letter-spacing: 6px;
  font-size: 20px;
  text-align: center;
}

#signup-step-form input[type="text"],
#signup-step-form input[type="password"] {
  margin-bottom: 0;
}

#resend-otp-link.disabled {
  color: #999;
  pointer-events: none;
  text-decoration: none;
}

#verify-otp-btn:disabled,
#go-login-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}