/* Chat page base */
body {
  margin: 0;
  min-height: 100vh;
  background: #f3f5f9;
  color: var(--color-text-primary);
  font-family: 'Inter', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  flex-direction: column;
}

a {
  color: inherit;
  text-decoration: none;
}

/* Navigation */
.nav-wrapper {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(232, 238, 244, 0.9));
  box-shadow: 0 12px 28px rgba(15, 23, 42, 0.14);
  z-index: 25;
  backdrop-filter: blur(10px);
}

.brand-logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-primary);
}

.nav-right-icons {
  display: inline-flex;
  align-items: center;
  gap: 18px;
}

.notification-container {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.notification-bell,
.burger-menu {
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: color var(--transition-base);
}

.notification-bell:hover,
.burger-menu:hover {
  color: var(--color-primary);
}

.notification-badge {
  position: absolute;
  top: -6px;
  right: -6px;
  min-width: 18px;
  height: 18px;
  padding: 0 6px;
  border-radius: 999px;
  background: var(--color-danger);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  display: none;
}

.notification-badge.is-visible {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.notification-board {
  position: absolute;
  top: calc(100% + 12px);
  right: 0;
  width: min(280px, 90vw);
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  border: 1px solid rgba(148, 163, 184, 0.22);
  padding: 10px 0;
  display: none;
  flex-direction: column;
  z-index: 40;
}

.notification-board.is-visible {
  display: flex;
}

.notification-board .notification-item,
.notification-board .notification-element {
  padding: 10px 16px;
  color: var(--color-text-primary);
  transition: background var(--transition-base);
}

.notification-board .notification-item:hover,
.notification-board .notification-element:hover {
  background: rgba(58, 80, 107, 0.1);
}

/* Layout */
.container {
  margin-top: 90px;
  display: grid;
  grid-template-columns: clamp(220px, 22%, 280px) minmax(0, 1fr);
  gap: 20px;
  padding: 24px 32px 48px;
  box-sizing: border-box;
}

.group-list {
  background: linear-gradient(180deg, #1f2c3d, #1b2735);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 22px 18px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow-sm);
  height: calc(100vh - 136px);
  overflow-y: auto;
}

.group-list ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.group-list li {
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  transition: transform var(--transition-base), background var(--transition-base), box-shadow var(--transition-base);
  cursor: pointer;
}

.group-list li:hover,
.group-list li.active {
  background: rgba(255, 255, 255, 0.18);
  transform: translateX(4px);
  box-shadow: 0 14px 24px rgba(0, 0, 0, 0.2);
}

.member-container {
  position: relative;
}

.member-container button {
  position: absolute;
  top: -16px;
  right: -16px;
  padding: 6px 12px;
  border-radius: 999px;
  border: none;
  font-size: 0.75rem;
  font-weight: 600;
  background: var(--color-primary);
  color: #fff;
  cursor: pointer;
  transition: background var(--transition-base);
}

.member-container button:hover {
  background: var(--color-accent);
}

/* Chat area */
.chat-area,
.signature-area {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 20px;
  min-height: calc(100vh - 136px);
}

.chat-header,
.signature-header {
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-md);
  padding: 14px 18px;
  font-weight: 600;
  font-size: 1.1rem;
  text-align: center;
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  background: rgba(58, 80, 107, 0.04);
  border-radius: var(--radius-md);
  border: 1px solid rgba(148, 163, 184, 0.25);
}

.message-container {
  display: flex;
}

.message {
  max-width: 68%;
  padding: 10px 14px;
  border-radius: var(--radius-lg);
  background: var(--color-secondary);
  color: var(--color-text-primary);
  box-shadow: 0 8px 16px rgba(15, 23, 42, 0.12);
  position: relative;
  display: inline-flex;
  flex-direction: column;
  gap: 6px;
}

.message.user {
  margin-left: auto;
  background: linear-gradient(135deg, #2196f3, #1363b5);
  color: #fff;
}

.message-time {
  font-size: 0.75rem;
  opacity: 0.7;
  align-self: flex-end;
}

.input-area {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: var(--radius-md);
  background: rgba(148, 163, 184, 0.18);
}

.input-area input[type='text'] {
  flex: 1;
  border: 1px solid rgba(148, 163, 184, 0.4);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  font-size: 0.95rem;
}

.input-area .attachment-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(58, 80, 107, 0.12);
  color: var(--color-primary);
  cursor: pointer;
}

.input-area button {
  padding: 10px 18px;
  border: none;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, #2980b9, #1f608d);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.input-area button:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 22px rgba(41, 128, 185, 0.35);
}

.tabs {
  display: inline-flex;
  gap: 10px;
}

.tabs button {
  padding: 8px 16px;
  border-radius: var(--radius-md);
  border: none;
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.tabs button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 18px rgba(58, 80, 107, 0.25);
}

.signature-area {
  gap: 18px;
  transition: opacity 0.3s ease;
}

.signature-area.hidden {
  display: none !important;
}

.signature-content {
  background: rgba(58, 80, 107, 0.08);
  color: var(--color-text-primary);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.signature-description,
.signature-documents {
  display: flex;
  gap: 12px;
  overflow-x: auto;
  padding-bottom: 6px;
}

.signature-description li {
  list-style: none;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: #fff;
  min-width: 140px;
  text-align: center;
  cursor: pointer;
  transition: transform var(--transition-base), background var(--transition-base);
}

.signature-description li:hover {
  background: var(--color-accent);
  transform: translateY(-2px);
}

.new-request-btn,
#request-document-button,
.sign-button {
  padding: 10px 18px;
  border-radius: var(--radius-md);
  border: none;
  background: linear-gradient(135deg, var(--color-success), #2e7d32);
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.new-request-btn:hover,
#request-document-button:hover,
.sign-button:hover {
  transform: translateY(-1px);
  box-shadow: 0 12px 24px rgba(76, 175, 80, 0.32);
}

/* Modals */
.modal,
.notifications-modal,
.qr-modal,
.request-modal,
.modal-document,
.pairing-modal {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  display: none;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(10px);
  z-index: 60;
  padding: 24px;
  box-sizing: border-box;
}

.modal.is-visible,
.notifications-modal.is-visible,
.qr-modal.is-visible,
.request-modal.is-visible,
.modal-document.is-visible,
.pairing-modal.is-visible {
  display: flex;
}

.modal-content,
.notifications-content,
.qr-modal-content,
.request-modal .modal-content,
.modal-document .modal-content,
.pairing-modal-content {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: min(480px, 100%);
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.close-modal,
.close-button,
.close-qr-modal,
.close-signature,
.close-contract-popup {
  position: absolute;
  top: 14px;
  right: 14px;
  border: none;
  background: transparent;
  font-size: 1.4rem;
  color: var(--color-text-secondary);
  cursor: pointer;
}

.close-modal:hover,
.close-button:hover,
.close-qr-modal:hover,
.close-signature:hover,
.close-contract-popup:hover {
  color: var(--color-primary);
}

.modal-footer,
.button-group,
.header-buttons {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
}

/* Responsive */
@media (max-width: 1024px) {
  .container {
    grid-template-columns: 1fr;
    padding: 18px 18px 36px;
  }

  .group-list {
    height: auto;
    max-height: none;
  }
}

@media (max-width: 768px) {
  .nav-wrapper {
    height: auto;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    padding: 14px 18px;
  }

  .nav-right-icons {
    align-self: flex-end;
  }

  .container {
    padding: 16px 14px 32px;
  }

  .chat-area,
  .signature-area {
    min-height: auto;
  }
}

@media (max-width: 480px) {
  .message {
    max-width: 85%;
  }

  .input-area {
    flex-direction: column;
    align-items: stretch;
  }

  .input-area button {
    width: 100%;
  }

  .tabs {
    flex-wrap: wrap;
  }

  .tabs button {
    width: 100%;
  }
}