/* ============================================
   Input Area & Upload Components
   WeChat-accurate input bar
   ============================================ */

/* ---- Message Form ---- */
.message-input {
  width: 100%;
  display: flex;
  align-items: flex-end;
}

.input-wrapper {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  width: 100%;
}

.input-field-container {
  flex: 1;
  display: flex;
  align-items: flex-end;
  background: var(--color-white);
  border-radius: 6px;
  position: relative;
  min-height: 36px;
}

.input-field-container textarea {
  flex: 1;
  border: none;
  padding: 8px 40px 8px 12px;
  font-size: 16px;
  resize: none;
  min-height: 20px;
  max-height: 100px;
  background: transparent;
  font-family: var(--font-family);
  line-height: 1.4;
  outline: none;
  -webkit-user-select: text;
  user-select: text;
  color: var(--color-gray-900);
}

.input-field-container textarea::placeholder {
  color: var(--color-gray-400);
}

/* ---- File Button (left side) ---- */
.file-button {
  background: none;
  color: var(--color-gray-600);
  font-size: 22px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border-radius: 4px;
}

.file-button:active {
  background: var(--color-gray-200);
}

/* ---- Send Button (inside input, right) ---- */
.send-button {
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 6px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: absolute;
  right: 3px;
  bottom: 3px;
  transform: scale(0);
  opacity: 0;
  transition: transform 150ms ease, opacity 150ms ease;
}

.send-button.show {
  transform: scale(1);
  opacity: 1;
}

.send-button:active:not(:disabled) {
  transform: scale(0.9);
}

.send-button:disabled {
  background: var(--color-gray-300);
  cursor: not-allowed;
}

.send-icon {
  width: 16px;
  height: 16px;
}

.send-button.loading .send-icon {
  animation: spin 1s linear infinite;
}

/* ---- Function Button (inside input, right) ---- */
.function-button {
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 6px;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  position: absolute;
  right: 3px;
  bottom: 3px;
  z-index: 10;
  pointer-events: auto;
  transition: transform 150ms ease, opacity 150ms ease;
}

.function-button.show {
  transform: scale(1);
  opacity: 1;
  pointer-events: auto;
}

.function-button.hide {
  transform: scale(0);
  opacity: 0;
  pointer-events: none;
}

.function-button:active:not(:disabled) {
  transform: scale(0.9);
}

.function-icon {
  width: 14px;
  height: 14px;
  color: white;
  transition: transform 200ms ease;
}

/* ---- Upload Status ---- */
.upload-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-gray-700);
  font-size: 13px;
  padding: 8px 12px;
  background: var(--color-primary-50);
  border-radius: 6px;
  margin-bottom: 8px;
  animation: uploadPulse 2s ease-in-out infinite;
}

.upload-spinner {
  animation: spin 1s linear infinite;
  font-size: 16px;
  flex-shrink: 0;
}

.upload-progress {
  flex: 1;
  height: 3px;
  background: var(--color-primary-100);
  border-radius: 2px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: var(--color-primary);
  border-radius: 2px;
  width: 0%;
  transition: width 250ms ease;
}

@keyframes uploadPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

/* ---- Drag Overlay ---- */
.drag-overlay {
  position: fixed;
  inset: 0;
  background: rgba(7, 193, 96, 0.06);
  backdrop-filter: blur(3px);
  z-index: var(--z-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms ease;
}

.drag-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.drag-content {
  background: var(--bg-glass-strong);
  border: 2px dashed var(--color-primary);
  border-radius: 16px;
  padding: 40px;
  text-align: center;
  transform: scale(0.95);
  transition: transform 200ms ease;
}

.drag-overlay.active .drag-content {
  transform: scale(1);
}

.drag-icon {
  font-size: 48px;
  margin-bottom: 12px;
  animation: bounce 1s infinite;
  line-height: 1;
}

.drag-text {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.drag-hint {
  font-size: 14px;
  color: var(--color-gray-500);
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
  40% { transform: translateY(-8px); }
  60% { transform: translateY(-4px); }
}

body.dragging .message-list {
  opacity: 0.6;
}

/* ---- AI Mode on Input Container ---- */
.input-container.ai-mode {
  border-top: 2px solid #7c5cbf;
}

/* ---- AI Mode Indicator ---- */
.ai-mode-indicator {
  position: absolute;
  top: -11px;
  right: 12px;
  background: var(--bubble-ai);
  color: var(--color-white);
  padding: 1px 8px;
  border-radius: 10px;
  font-size: 10px;
  font-weight: 500;
  z-index: 10;
  animation: aiModeSlideIn 250ms ease-out;
}

@keyframes aiModeSlideIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ---- Upload Info (batch upload) ---- */
.upload-info { flex: 1; }

.upload-text {
  font-weight: 500;
  color: var(--color-gray-900);
  font-size: 13px;
}

.upload-current {
  font-size: 12px;
  color: var(--color-gray-500);
  margin-top: 2px;
}

/* ---- Keyboard Hint ---- */
.keyboard-hint {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 13px;
  opacity: 0;
  transform: translateY(10px);
  transition: all 200ms ease;
  z-index: var(--z-toast);
  max-width: 280px;
  text-align: center;
}

.keyboard-hint.show {
  opacity: 1;
  transform: translateY(0);
}

/* ---- Connection Status ---- */
.connection-status {
  position: fixed;
  top: 8px;
  right: 8px;
  padding: 4px 10px;
  border-radius: 10px;
  font-size: 11px;
  font-weight: 500;
  z-index: var(--z-toast);
  pointer-events: none;
  opacity: 0;
  transform: translateY(-10px);
  transition: all 300ms ease;
}

.connection-status.online,
.connection-status.offline,
.connection-status.connecting,
.connection-status.reconnecting {
  opacity: 0.9;
  transform: translateY(0);
}

.connection-status.online {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.connection-status.offline {
  background: var(--color-danger-bg);
  color: var(--color-danger);
}

.connection-status.connecting,
.connection-status.reconnecting {
  background: var(--color-warning-bg);
  color: #d48806;
}

/* ---- PWA Update Banner ---- */
.pwa-update-banner {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: var(--color-primary);
  color: white;
  padding: 10px 16px;
  z-index: var(--z-toast);
  animation: slideDown 250ms ease;
}

.update-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  max-width: var(--app-max-width);
  margin: 0 auto;
  font-size: 14px;
}

.update-btn {
  background: white;
  color: var(--color-primary);
  padding: 4px 14px;
  border-radius: 14px;
  font-size: 13px;
  font-weight: 500;
}

/* ---- Toast Notification ---- */
.toast-notification {
  position: fixed;
  top: 12px;
  left: 50%;
  transform: translateX(-50%) translateY(-120%);
  padding: 8px 20px;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  color: white;
  z-index: var(--z-max);
  pointer-events: none;
  opacity: 0;
  transition: transform 300ms ease, opacity 200ms ease;
  max-width: 85vw;
  text-align: center;
}

.toast-notification.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.toast-notification.toast-success { background: var(--color-primary); }
.toast-notification.toast-error { background: var(--color-danger); }
.toast-notification.toast-warning { background: #e6a700; }
.toast-notification.toast-info { background: rgba(0, 0, 0, 0.75); }