:root {
  --primary: #ff6633;
  --primary-hover: #df4e20;
  --secondary: #3d5269;
  --secondary-dark: #263b50;
  --bg-main: #f3f5f8;
  --bg-chat: #f4f5f7;
  --card-bg: #ffffff;
  --text-main: #25282d;
  --text-muted: #6c727b;
  --border-color: #dfe3e8;
  --error-color: #b42318;
  --shadow-lg: 0 20px 55px rgba(25, 35, 50, 0.23);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text-main);
  background: radial-gradient(circle at top left, rgba(255, 102, 51, 0.15), transparent 35%), var(--bg-main);
}

button, textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button:focus-visible, textarea:focus-visible {
  outline: 3px solid rgba(255, 102, 51, 0.3);
  outline-offset: 2px;
}

.demo {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 32px 20px;
}

.hero {
  width: min(800px, 100%);
  padding: 50px;
  border-radius: 26px;
  text-align: center;
  background: var(--card-bg);
  box-shadow: 0 24px 70px rgba(30, 45, 60, 0.12);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  margin-bottom: 30px;
  text-align: left;
}

.brand-icon {
  width: 55px;
  height: 55px;
  display: grid;
  place-items: center;
  border-radius: 17px;
  font-weight: 800;
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
}

.brand strong {
  display: block;
  font-size: 23px;
  color: var(--secondary);
}

.brand span {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  letter-spacing: 2px;
  color: var(--text-muted);
}

.hero-label {
  display: inline-block;
  margin: 0 0 16px;
  padding: 8px 15px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 700;
  color: var(--primary-hover);
  background: rgba(255, 102, 51, 0.12);
}

.hero h1 {
  max-width: 650px;
  margin: 0 auto;
  font-size: clamp(34px, 6vw, 55px);
  line-height: 1.12;
  color: var(--secondary-dark);
}

.hero-description {
  max-width: 650px;
  margin: 24px auto 32px;
  font-size: 18px;
  line-height: 1.7;
  color: var(--text-muted);
}

.primary-button {
  border: 0;
  border-radius: 13px;
  padding: 14px 22px;
  font-weight: 700;
  color: #ffffff;
  background: var(--primary);
  box-shadow: 0 10px 25px rgba(255, 102, 51, 0.25);
  transition: transform 0.2s ease, background 0.2s ease;
}

.primary-button:hover {
  transform: translateY(-2px);
  background: var(--primary-hover);
}

.chatbot-toggler {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 1001;
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
  box-shadow: 0 14px 35px rgba(0, 0, 0, 0.25);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.chatbot-toggler:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.3);
}

.chatbot-toggler .icon {
  position: absolute;
  display: grid;
  place-items: center;
  font-size: 25px;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.chatbot-toggler .open-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.chatbot-toggler .close-icon {
  opacity: 0;
  transform: rotate(-90deg) scale(0.5);
}

body.show-chatbot .chatbot-toggler .open-icon {
  opacity: 0;
  transform: rotate(90deg) scale(0.5);
}

body.show-chatbot .chatbot-toggler .close-icon {
  opacity: 1;
  transform: rotate(0deg) scale(1);
}

.chatbot-popup {
  position: fixed;
  right: 24px;
  bottom: 102px;
  z-index: 1000;
  width: min(410px, calc(100vw - 32px));
  height: min(630px, calc(100vh - 125px));
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid rgba(61, 82, 105, 0.15);
  border-radius: 22px;
  background: var(--card-bg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transform: translateY(25px) scale(0.95);
  transform-origin: bottom right;
  transition: opacity 0.22s ease, visibility 0.22s ease, transform 0.22s ease;
}

body.show-chatbot .chatbot-popup {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transform: translateY(0) scale(1);
}

.chat-header {
  min-height: 82px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 15px 17px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--secondary-dark), var(--secondary));
}

.header-info {
  display: flex;
  align-items: center;
  gap: 12px;
}

.chatbot-logo, .message-avatar {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
}

.chatbot-logo {
  width: 47px;
  height: 47px;
  border-radius: 15px;
  font-size: 21px;
}

.chat-header h2 {
  margin: 0;
  font-size: 17px;
}

.chat-header p {
  display: flex;
  align-items: center;
  gap: 7px;
  margin: 6px 0 0;
  font-size: 12px;
  opacity: 0.9;
}

.online {
  width: 9px;
  height: 9px;
  border: 2px solid rgba(255, 255, 255, 0.55);
  border-radius: 50%;
  background: #53e295;
}

.header-button {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 10px;
  font-size: 21px;
  color: #ffffff;
  background: rgba(255, 255, 255, 0.1);
  transition: background 0.2s ease;
}

.header-button:hover {
  background: rgba(255, 255, 255, 0.22);
}

.suggestions {
  display: flex;
  gap: 7px;
  padding: 10px 12px;
  overflow-x: auto;
  border-bottom: 1px solid var(--border-color);
  background: var(--card-bg);
}

.suggestion-button {
  flex: 0 0 auto;
  border: 1px solid rgba(255, 102, 51, 0.5);
  border-radius: 999px;
  padding: 7px 11px;
  font-size: 12px;
  font-weight: 600;
  color: var(--primary-hover);
  background: rgba(255, 102, 51, 0.06);
  transition: color 0.2s ease, background 0.2s ease;
}

.suggestion-button:hover {
  color: #ffffff;
  background: var(--primary);
}

.chat-body {
  flex: 1;
  padding: 17px 14px;
  overflow-y: auto;
  background: var(--bg-chat);
  scroll-behavior: smooth;
}

.message {
  display: flex;
  align-items: flex-end;
  gap: 9px;
  margin-bottom: 15px;
}

.message-avatar {
  width: 35px;
  height: 35px;
  border-radius: 11px;
  font-size: 15px;
}

.message-content {
  max-width: 82%;
  padding: 11px 13px;
  border-radius: 16px;
  line-height: 1.48;
  overflow-wrap: anywhere;
  box-shadow: 0 3px 12px rgba(25, 35, 50, 0.07);
}

.message-content p {
  margin: 0;
  white-space: pre-line;
}

.message-content p + p {
  margin-top: 7px;
}

.bot-message .message-content {
  border-bottom-left-radius: 5px;
  background: var(--card-bg);
}

.user-message {
  justify-content: flex-end;
}

.user-message .message-content {
  border-bottom-right-radius: 5px;
  color: #ffffff;
  background: linear-gradient(135deg, var(--primary), var(--primary-hover));
}

.error-message .message-content {
  color: var(--error-color);
  background: #fff0ee;
}

.thinking-indicator {
  display: flex;
  gap: 5px;
  align-items: center;
  height: 20px;
}

.thinking-indicator span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--secondary);
  animation: thinking 1.2s infinite ease-in-out;
}

.thinking-indicator span:nth-child(2) {
  animation-delay: 0.15s;
}

.thinking-indicator span:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes thinking {
  0%, 60%, 100% {
    transform: translateY(0);
    opacity: 0.4;
  }
  30% {
    transform: translateY(-5px);
    opacity: 1;
  }
}

.message-sources {
  margin-top: 9px;
  padding-top: 8px;
  border-top: 1px solid var(--border-color);
}

.message-sources a {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  font-weight: 600;
  color: var(--secondary);
  text-decoration: none;
}

.message-sources a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

.chat-footer {
  padding: 10px 12px 8px;
  border-top: 1px solid var(--border-color);
  background: var(--card-bg);
}

.input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 7px;
  border: 1px solid var(--border-color);
  border-radius: 15px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.input-wrapper:focus-within {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 102, 51, 0.1);
}

.message-input {
  min-height: 42px;
  max-height: 110px;
  flex: 1;
  resize: none;
  border: 0;
  outline: 0;
  padding: 10px 8px;
  line-height: 1.4;
  color: var(--text-main);
  background: transparent;
}

.send-button {
  width: 43px;
  height: 43px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
  border: 0;
  border-radius: 12px;
  font-size: 17px;
  color: #ffffff;
  background: var(--primary);
  transition: transform 0.2s ease, background 0.2s ease;
}

.send-button:hover {
  transform: scale(1.04);
  background: var(--primary-hover);
}

.send-button:disabled {
  cursor: not-allowed;
  opacity: 0.55;
  transform: none;
}

.chat-notice {
  margin: 7px 0 0;
  text-align: center;
  font-size: 10px;
  color: var(--text-muted);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
}

@media (max-width: 540px) {
  .demo {
    padding: 20px 14px;
  }
  .hero {
    padding: 34px 20px;
  }
  .hero-description {
    font-size: 16px;
  }
  .chatbot-toggler {
    right: 15px;
    bottom: 15px;
  }
  .chatbot-popup {
    right: 8px;
    bottom: 88px;
    width: calc(100vw - 16px);
    height: calc(100vh - 103px);
  }
}