/* ===== CONFIGURATION & CONSTANTS ===== */
:root {
  --primary-blue: #007bff;
  --background-color: #ffffff;
  --border-blue: #d2e5ff;
  --text-primary: #1a202c;
  --text-secondary: #718096;
  --incoming-bubble: #f1f5f9;
  --outgoing-bubble: #007bff;
  --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  --border-color: #e2e8f0;
  /* CHANGE: Font updated for English UI */
  --font-family: "Inter", sans-serif;
  --content-max-width: 980px;
}

/* ===== GLOBAL STYLES & RESET ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: var(--font-family);
  background-color: var(--border-blue);
  color: var(--text-primary);
  height: 100vh;
  padding: 8px;
  overflow: hidden;
}

/* ===== MAIN LAYOUT CONTAINER ===== */
.page-container {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  background-color: var(--background-color);
  border-radius: 16px;
  overflow: hidden;
  position: relative;
  background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 200"><filter id="n"><feTurbulence type="fractalNoise" baseFrequency="0.9" numOctaves="1" stitchTiles="stitch"/></filter><rect width="100%" height="100%" filter="url(%23n)" opacity="0.03"/></svg>');
}

/* ===== SHARED COMPONENT: HEADER ===== */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-color);
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  flex-shrink: 0;
  z-index: 10;
}
.header__logo {
  display: flex;
  align-items: center;
  gap: 12px;
}
.header__logo h1 {
  font-size: 20px;
  font-weight: 700;
}
.header__button {
  background-color: var(--primary-blue);
  color: white;
  border: none;
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 14px;
  font-weight: 500;
  font-family: var(--font-family);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: background-color 0.2s ease;
}
.header__button:hover {
  background-color: #0056b3;
}

/* ===== PAGE SPECIFIC: WELCOME SCREEN (index.html) ===== */
.welcome-screen {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding-bottom: 80px;
}
.sphere-placeholder {
  width: 300px;
  height: 300px;
  position: relative;
}
#sphere-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.welcome-message {
  font-size: 32px;
  font-weight: 500;
  line-height: 1.4;
  color: #334155;
}

/* ===== PAGE SPECIFIC: CHAT MESSAGES (chat.html) ===== */
.chat-messages-container {
  flex-grow: 1;
  overflow-y: auto;
}
.chat-content-wrapper {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.message-group {
  display: flex;
  gap: 12px;
  max-width: 75%;
}
.avatar-placeholder {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background-color: var(--border-color);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: flex-end;
}
.message-bubble {
  padding: 12px 16px;
  border-radius: 18px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}
.message-text {
  font-size: 15px;
  line-height: 1.6;
}
.message-meta {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 6px;
  margin-top: 8px;
  color: var(--text-secondary);
}
.time {
  font-size: 12px;
}
.status-icon {
  width: 16px;
  height: 16px;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  stroke: currentColor;
}

/* Message Modifiers (Correct for LTR) */
.message-group.incoming {
  align-self: flex-start;
}
.message-group.incoming .message-bubble {
  border-bottom-left-radius: 4px;
  background-color: var(--incoming-bubble);
}
.message-group.outgoing {
  align-self: flex-end;
}
.message-group.outgoing .message-bubble {
  background-color: var(--outgoing-bubble);
  color: white;
  border-bottom-right-radius: 4px;
}
.message-group.outgoing .message-meta {
  color: rgba(255, 255, 255, 0.7);
}

/* ===== SHARED COMPONENT: MESSAGE INPUT ===== */
.message-input-area {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  background-color: rgba(255, 255, 255, 0.8);
  backdrop-filter: blur(10px);
  flex-shrink: 0;
  z-index: 10;
}
.message-form {
  max-width: var(--content-max-width);
  margin: 0 auto;
  background-color: white;
  border-radius: 14px;
  padding: 8px;
  box-shadow: var(--card-shadow);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 8px;
}
.message-input {
  flex-grow: 1;
  border: none;
  background: transparent;
  font-size: 15px;
  font-family: var(--font-family);
  color: var(--text-primary);
  padding: 10px;
  resize: none;
  line-height: 1.5;
  outline: none;
}
.message-input::placeholder {
  color: var(--text-secondary);
}
.action-buttons {
  display: flex;
  align-items: center;
  gap: 4px;
}
.icon-button {
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--text-secondary);
  transition: color 0.2s ease;
}
.icon-button:hover {
  color: var(--primary-blue);
}
.send-button {
  background-color: var(--primary-blue);
  color: white;
  border: none;
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
}
.send-button:hover {
  background-color: #0056b3;
}
.send-button:active {
  transform: scale(0.98);
}
.send-button span {
  display: inline;
}
.send-button svg {
  display: none;
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  body {
    padding: 0;
  }
  .page-container {
    border-radius: 0;
  }
  .header,
  .message-input-area {
    padding: 12px 16px;
  }
  .chat-content-wrapper {
    padding: 16px;
  }
  .header__button .button-text {
    display: none;
  }
  .header__button {
    padding: 10px;
  }
  .message-group {
    max-width: 90%;
  }
  .send-button span {
    display: none;
  }
  .send-button svg {
    display: block;
  }
}