:root {
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --primary: #4f46e5;
  --primary-600: #4338ca;
  
  /* Sidebar colors */
  --sidebar-bg: #f8fafc;
  --sidebar-border: #e2e8f0;
  --sidebar-text-primary: #0f172a;
  --sidebar-text-secondary: #64748b;
  --sidebar-hover: #f1f5f9;
  --sidebar-active: #F2F2F2;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background: #ffffff;
  color: var(--text);
  overflow: hidden;
}

.wrap { max-width: 880px; margin: 0 auto; padding: 24px; }
.brand { font-weight: 700; letter-spacing: 0.3px; margin: 8px 0 24px; }

.card { max-width: 520px; margin: 40px auto; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 28px; box-shadow: 0 6px 20px rgba(2, 8, 23, 0.04); }
.card h1 { font-size: 20px; margin: 0 0 18px; }

.btn {
  width: 100%;
  padding: 12px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  font-weight: 600;
  cursor: pointer;
}
.btn:hover { filter: brightness(0.98); }
.btn:active { transform: translateY(0.5px); }

.btn.sso img { width: 18px; height: 18px; vertical-align: middle; margin-right: 8px; }
.btn.primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn.primary:hover { background: var(--primary-600); border-color: var(--primary-600); }

.divider { position: relative; text-align: center; color: var(--muted); font-size: 12px; margin: 16px 0; }
.divider::before, .divider::after { content: ""; position: absolute; top: 50%; width: 44%; height: 1px; background: var(--border); }
.divider::before { left: 0; }
.divider::after { right: 0; }
.divider span { background: var(--card); padding: 0 8px; position: relative; }

.field { display: block; margin: 12px 0; }
.label { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
input[type="text"], input[type="email"], input[type="password"] {
  width: 100%;
  padding: 12px 12px;
  border-radius: 8px;
  border: 1px solid var(--border);
  outline: none;
  font-size: 14px;
}
input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,70,229,0.12); }

.error { color: #dc2626; font-size: 12px; min-height: 16px; margin-top: 4px; }
.alt { text-align: center; color: var(--muted); font-size: 14px; margin-top: 10px; }
.tos { color: var(--muted); font-size: 12px; text-align: center; margin-top: 16px; }
.alt a, .tos a { color: var(--primary); text-decoration: none; }
.alt a:hover, .tos a:hover { text-decoration: underline; }

/* Modal Styles */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.upgrade-modal {
  background: white;
  border-radius: 16px;
  padding: 32px;
  max-width: 480px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

.modal-overlay.active .upgrade-modal {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  font-size: 24px;
  color: var(--muted);
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
}

.modal-close:hover {
  background: var(--border);
}

.upgrade-modal h2 {
  font-size: 24px;
  font-weight: 600;
  margin: 0 0 12px 0;
  color: var(--text);
}

.upgrade-modal .subtitle {
  color: var(--muted);
  margin-bottom: 24px;
  line-height: 1.5;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0 0 32px 0;
}

.feature-list li {
  display: flex;
  align-items: center;
  margin-bottom: 12px;
  color: var(--text);
}

.feature-list li::before {
  content: "✓";
  color: #10b981;
  font-weight: bold;
  margin-right: 12px;
  font-size: 16px;
}

/* Plan Selection Styles */
.plan-selection {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}

.plan-card {
  flex: 1;
  border: 2px solid #e5e7eb;
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background: white;
}

.plan-card:hover {
  border-color: #3b82f6;
}

.plan-card.active {
  border-color: #3b82f6;
  background: #fafbff;
}

.plan-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-bottom: 12px;
}

.plan-name {
  font-size: 16px;
  font-weight: 600;
  color: var(--text);
}

.plan-badge {
  background: #3b82f6;
  color: white;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 8px;
  border-radius: 6px;
}

.plan-price {
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.plan-currency {
  font-size: 14px;
  font-weight: 400;
  color: var(--muted);
}

.plan-description {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.4;
}

/* Legacy pricing card styles (kept for compatibility) */
.pricing-card {
  border: 2px solid var(--primary);
  border-radius: 12px;
  padding: 24px;
  text-align: center;
  margin-bottom: 24px;
  background: #fafbff;
}

.price {
  font-size: 36px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 4px;
}

.price-unit {
  font-size: 16px;
  font-weight: 400;
  color: var(--muted);
}

.price-description {
  color: var(--muted);
  font-size: 14px;
  margin-top: 8px;
}

.upgrade-btn {
  width: 100%;
  background: #000000;
  color: white;
  border: none;
  border-radius: 8px;
  padding: 16px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  margin-bottom: 16px;
  transition: background 0.2s ease;
}

.upgrade-btn:hover {
  background: #333333;
}

.testimonial {
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

/* =============================================================================
   MODERN SIDEBAR STYLES
   ============================================================================= */

.app-container {
  display: flex;
  height: 100vh;
  background: #ffffff;
}

/* Sidebar */
.sidebar {
  width: 256px;
  border-right: 1px solid var(--sidebar-border);
  display: flex;
  flex-direction: column;
  height: 100vh;
  position: relative;
  z-index: 50;
  transition: transform 0.2s ease;
}

.sidebar.collapsed {
  transform: translateX(-100%);
}

.sidebar-content {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
  overflow: hidden;
}

/* Sidebar Header */
.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  margin-top: 6px;
  margin-right: 8px;
}

.user-button {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 16px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--sidebar-text-primary);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.user-button:hover {
  background: var(--sidebar-hover);
}

.user-name {
  font-size: 14px;
  font-weight: 600;
  max-width: 140px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.chevron-down {
  margin-left: auto;
  color: var(--sidebar-text-secondary);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-toggle,
.add-button {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--sidebar-text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.2s ease;
}

.sidebar-toggle:hover,
.add-button:hover {
  background: var(--sidebar-hover);
}

.add-button {
  background: var(--sidebar-active);
}

/* Navigation */
.sidebar-nav {
  margin-bottom: 8px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 8px 16px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--sidebar-text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s ease;
  margin-bottom: 4px;
}

.nav-item:hover {
  background: var(--sidebar-hover);
}

.nav-item.active {
  background: var(--sidebar-active);
}

.nav-item svg {
  color: var(--sidebar-text-primary);
  flex-shrink: 0;
}

/* Scrollable Content */
.sidebar-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
}

/* Sidebar Sections */
.sidebar-section {
  margin-bottom: 16px;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 8px 16px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--sidebar-text-secondary);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease;
  position: relative;
}

.section-header:hover {
  background: var(--sidebar-hover);
}

.chevron-right {
  color: var(--sidebar-text-secondary);
  flex-shrink: 0;
  transition: transform 0.2s ease;
}

.chevron-right.expanded {
  transform: rotate(90deg);
}

.section-add-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--sidebar-text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0;
  visibility: hidden;
}

.section-header:hover .section-add-btn {
  opacity: 1;
  visibility: visible;
}

.section-add-btn:hover {
  background: var(--sidebar-active);
}

.section-content {
  padding-top: 4px;
}

.empty-message {
  color: var(--sidebar-text-secondary);
  font-size: 14px;
  padding: 12px 16px;
  margin: 0;
}

/* Folder Items */
.folder-item {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 8px 16px;
  border-radius: 8px;
  background: transparent;
  color: var(--sidebar-text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s ease;
  position: relative;
  margin-bottom: 4px;
}

.folder-item:hover {
  background: var(--sidebar-hover);
}

.folder-item svg {
  color: var(--sidebar-text-primary);
  flex-shrink: 0;
}

.folder-menu-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--sidebar-text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  opacity: 0;
  visibility: hidden;
}

.folder-item:hover .folder-menu-btn {
  opacity: 1;
  visibility: visible;
}

.folder-menu-btn:hover {
  background: var(--sidebar-active);
}

/* Bottom Actions */
.sidebar-bottom {
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.bottom-action {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 8px 16px;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--sidebar-text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.bottom-action:hover {
  background: var(--sidebar-hover);
}

.bottom-action svg {
  color: var(--sidebar-text-primary);
  flex-shrink: 0;
}

/* Main Content */
.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  height: 100vh;
  padding-bottom: 0;
  position: relative;
  left: 0;
  transition: left 0.2s ease;
}

/* Add padding when composer is at bottom */
.main-content.composer-bottom {
  padding-bottom: 280px;
}

/* Mobile Sidebar Toggle */
.mobile-only {
  display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
  }
  
  .mobile-only {
    display: flex;
  }
  
  .main-content {
    width: 100%;
  }
  
  .topbar {
    padding-left: 60px;
  }
}

/* Sidebar Overlay for Mobile */
.sidebar-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  display: none;
}

.sidebar-overlay.active {
  display: block;
}

@media (max-width: 768px) {
  .sidebar-overlay.active {
    display: block;
  }
}

/* Modern Header Styles */
.modern-header {
  position: sticky;
  top: 0;
  z-index: 10;
  padding: 16px 24px 16px 16px;
  height: 45px;
  flex-shrink: 0;
  width: 100%;
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: center;
  background: #ffffff;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.header-right {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 24px;
  margin-left: auto;
}

.sidebar-toggle-btn {
  display: none;
  align-items: center;
  justify-content: center;
  position: relative;
  font-weight: 600;
  white-space: nowrap;
  text-align: center;
  font-size: 14px;
  transition: colors 0.2s ease;
  outline: none;
  border: none;
  background: transparent;
  color: var(--sidebar-text-primary);
  cursor: pointer;
  height: 28px;
  width: 28px;
  border-radius: 8px;
}

.sidebar-toggle-btn:hover {
  background: var(--sidebar-hover);
}

.sidebar-toggle-btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.header-action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  font-weight: 600;
  white-space: nowrap;
  text-align: center;
  font-size: 14px;
  transition: colors 0.2s ease;
  outline: none;
  border: none;
  background: var(--sidebar-active);
  color: var(--sidebar-text-primary);
  cursor: pointer;
  height: 30px;
  border-radius: 8px;
  gap: 12px;
}

.header-action-btn:hover {
  background: var(--sidebar-hover);
}

.header-action-btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

.upgrade-header-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  position: relative;
  font-weight: 600;
  white-space: nowrap;
  text-align: center;
  font-size: 14px;
  transition: colors 0.2s ease;
  outline: none;
  border: none;
  background: var(--sidebar-active);
  color: var(--sidebar-text-primary);
  cursor: pointer;
  height: 30px;
  border-radius: 8px;
}

.upgrade-header-btn:hover {
  background: var(--sidebar-hover);
}

.upgrade-header-btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* Hide sidebar toggle when sidebar is visible */
.sidebar-visible .sidebar-toggle-btn {
  display: none !important;
}

/* Show sidebar toggle when sidebar is collapsed */
.sidebar.collapsed ~ .main-content .sidebar-toggle-btn {
  display: inline-flex !important;
  position: fixed;
  left: 5px;
  z-index: 100;
}

/* Responsive adjustments for modern header */
@media (max-width: 768px) {
  .modern-header {
    padding: 12px 16px;
  }
  
  .header-right {
    gap: 16px;
  }
  
  .sidebar-toggle-btn {
    display: inline-flex !important;
  }
}

/* Adjust existing topbar for backward compatibility */
.topbar {
  position: sticky;
  top: 0;
  background: #fff;
  border-bottom: 1px solid var(--border);
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Adjust chat area for sidebar */
.chat {
  flex: 1;
  overflow-y: visible;
  padding: 32px;
  min-height: calc(100vh - 180px);
  position: relative;
}

/* Chat messages container to match composer width and positioning */
.messages {
  max-width: 727px;
  width: 100%;
  margin: 0 auto;
  position: relative;
  left: 0;
  transition: left 0.2s ease;
}

/* Adjust messages positioning when sidebar is collapsed to match composer */
.sidebar.collapsed ~ .main-content .messages {
  /* Messages should align with collapsed composer position */
  left: -128px; /* Half of sidebar width to center properly */
}

/* Adjust composer for sidebar */
.composer {
  position: fixed;
  left: 256px;
  right: 0;
  bottom: 0;
  background: linear-gradient(180deg, rgba(255,255,255,0), #fff 12px);
  padding: 12px 16px;
  transition: left 0.2s ease;
}

.sidebar.collapsed + .main-content .composer,
.composer.sidebar-collapsed {
  left: 0;
}

@media (max-width: 768px) {
  .composer {
    left: 0;
  }
}

/* Modern Composer Styles - Default centered position */
.modern-composer {
  position: fixed;
  left: 256px;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  background: transparent;
  padding: 32px;
  transition: all 0.4s ease;
}

/* Bottom composer after first message */
.modern-composer.bottom {
  top: auto;
  bottom: 0;
  transform: none;
  background: linear-gradient(180deg, rgba(255,255,255,0), #fff 12px);
}

.composer-container {
  max-width: 754px;
  width: 100%;
  margin: 0 auto;
}

.modern-input-wrapper {
  position: relative;
  border: 2px solid #f3f4f6;
  border-radius: 24px;
  background: white;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  padding: 1px;
}

.input-section {
  position: relative;
}

.input-section textarea {
  width: 100%;
  min-height: 20px;
  resize: none;
  border: none;
  background: transparent;
  padding: 16px 60px 16px 8px;
  font-size: 15px;
  line-height: 1.5;
  font-family: inherit;
  outline: none;
}

.input-section textarea::placeholder {
  color: #6b7280;
}

.send {
  position: absolute;
  right: 8px;
  top: 118%;
  transform: translateY(-50%);
  background: #e2e8f0;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 50%;
  color: #64748b;
  transition: all 0.2s ease;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.send:hover,
.send:active {
  background: #000000;
  color: white;
}

.send svg {
  width: 16px;
  height: 16px;
}

.action-buttons {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 12px;
  padding: 0 10px 10px;
}

.action-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 8px;
  height: 26px;
  border-radius: 8px;
  border: none;
  background: var(--sidebar-active);
  color: var(--sidebar-text-primary);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: background-color 0.2s ease;
  white-space: nowrap;
}

.action-btn:hover {
  background: var(--sidebar-hover);
}

.icon-btn {
  padding: 8px 12px;
  min-width: 44px;
}

.dropdown-container {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 4px;
  background: white;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  z-index: 50;
  min-width: 120px;
  display: none;
}

.dropdown-menu.active {
  display: block;
}

.dropdown-item {
  display: block;
  width: 100%;
  padding: 8px 20px;
  font-size: 12px;
  text-align: left;
  color: #374151;
  background: none;
  border: none;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.dropdown-item:hover {
  background: #f3f4f6;
}

.sidebar.collapsed ~ .main-content .modern-composer {
  left: 0;
}

.sidebar.collapsed ~ .main-content .modern-composer.bottom {
  left: 0;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .modern-composer {
    left: 0;
    padding: 16px;
  }
  
  .action-buttons {
    flex-wrap: wrap;
    gap: 8px;
  }
  
  .action-btn {
    padding: 6px 12px;
    height: 36px;
    font-size: 12px;
  }
}