/*
 * answerr - Modern Design System & Global Styles
 * Theme: Cosmic Deep Dark / Clean Minimalist Light
 * Typography: Outfit / Inter / JetBrains Mono
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&family=Outfit:wght@400;500;600;700;800&display=swap');

:root {
  --bg-app: #07090e;
  --bg-sidebar: #0b0e17;
  --bg-card: #0f1422;
  --bg-card-hover: #151b2e;
  --bg-input: #121829;
  --bg-glass: rgba(15, 20, 34, 0.75);
  
  --border-subtle: #1c2438;
  --border-hover: #2a3652;
  --border-accent: rgba(56, 189, 248, 0.4);
  
  --text-main: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  --cyan: #38bdf8;
  --cyan-glow: rgba(56, 189, 248, 0.25);
  --emerald: #10b981;
  --emerald-glow: rgba(16, 185, 129, 0.25);
  --rose: #f43f5e;
  --rose-glow: rgba(244, 63, 94, 0.25);
  --indigo: #818cf8;
  --indigo-glow: rgba(129, 140, 248, 0.25);
  --amber: #fbbf24;
  --purple: #c084fc;

  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  
  --shadow-main: 0 20px 40px -15px rgba(0, 0, 0, 0.7), 0 0 0 1px rgba(255, 255, 255, 0.04) inset;
  --shadow-glow: 0 0 25px var(--cyan-glow);
  
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="light"] {
  --bg-app: #f8fafc;
  --bg-sidebar: #f1f5f9;
  --bg-card: #ffffff;
  --bg-card-hover: #f8fafc;
  --bg-input: #ffffff;
  --bg-glass: rgba(255, 255, 255, 0.85);
  
  --border-subtle: #e2e8f0;
  --border-hover: #cbd5e1;
  --border-accent: rgba(2, 132, 199, 0.3);
  
  --text-main: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --cyan: #0284c7;
  --cyan-glow: rgba(2, 132, 199, 0.15);
  --emerald: #059669;
  --emerald-glow: rgba(5, 150, 105, 0.15);
  --rose: #e11d48;
  --rose-glow: rgba(225, 29, 72, 0.15);
  --indigo: #6366f1;
  --indigo-glow: rgba(99, 102, 241, 0.15);
  
  --shadow-main: 0 10px 30px -10px rgba(0, 0, 0, 0.08), 0 0 0 1px rgba(0, 0, 0, 0.04);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--bg-app);
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  overflow: hidden;
  background-image: radial-gradient(circle at 50% 0%, rgba(56, 189, 248, 0.07) 0%, transparent 60%),
                    radial-gradient(circle at 10% 30%, rgba(129, 140, 248, 0.04) 0%, transparent 40%);
}

/* Custom Scrollbars */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-subtle);
  border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--border-hover);
}

/* App Container Layout */
.app-layout {
  display: flex;
  width: 100vw;
  height: 100vh;
  position: relative;
  overflow: hidden;
}

/* Sidebar (Collapsible Drawer) */
.sidebar {
  width: 280px;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  transition: margin-left 0.26s cubic-bezier(0.16, 1, 0.3, 1);
  z-index: 50;
  flex-shrink: 0;
}

.sidebar.collapsed {
  margin-left: -280px;
}

/* Reopen Sidebar Button in Topbar */
.btn-open-sidebar {
  display: none;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  color: var(--cyan);
  cursor: pointer;
  transition: var(--transition);
  flex-shrink: 0;
  margin-right: 0.25rem;
}

.sidebar.collapsed ~ .chat-container .btn-open-sidebar {
  display: inline-flex;
  animation: sidebarBtnPop 0.22s cubic-bezier(0.16, 1, 0.3, 1);
}

.btn-open-sidebar:hover {
  background: var(--bg-card-hover);
  border-color: var(--cyan);
  color: #ffffff;
  box-shadow: 0 0 14px var(--cyan-glow);
  transform: scale(1.05);
}

@keyframes sidebarBtnPop {
  0% {
    opacity: 0;
    transform: scale(0.8);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

.sidebar-backdrop {
  display: none;
}

.sidebar-header {
  padding: 1.25rem 1.25rem 0.75rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-badge {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--text-main);
}

.brand-logo-img {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  filter: drop-shadow(0 0 8px var(--cyan-glow));
}

.brand-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #38bdf8 0%, #c084fc 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.btn-new-chat {
  margin: 0.75rem 1.25rem;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  color: var(--text-main);
  font-weight: 600;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: var(--transition);
}

.btn-new-chat:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  box-shadow: 0 4px 12px rgba(56, 189, 248, 0.15);
}

.sidebar-history {
  flex: 1;
  overflow-y: auto;
  padding: 0.5rem 1rem;
}

.history-label {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 1rem 0.5rem 0.5rem;
}

.history-item {
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.88rem;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: var(--transition);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.history-item:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
}

.history-item.active {
  background: var(--bg-card);
  color: var(--cyan);
  border: 1px solid var(--border-accent);
}

.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.system-status-indicator {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--emerald);
  box-shadow: 0 0 8px var(--emerald);
  animation: pulse-dot 2s infinite ease-in-out;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 0.7; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.2); }
}

.sidebar-links {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.icon-btn {
  background: transparent;
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: var(--transition);
}

.icon-btn:hover {
  background: var(--bg-card-hover);
  color: var(--cyan);
  border-color: var(--border-accent);
}

/* Modals */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(8px);
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.modal-backdrop.open {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-main);
  width: 90%;
  max-width: 520px;
  padding: 1.75rem;
  transform: translateY(20px) scale(0.97);
  transition: var(--transition);
}

.modal-backdrop.open .modal-box {
  transform: translateY(0) scale(1);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.modal-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
}

.modal-body {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.form-input, .form-select {
  background: var(--bg-input);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  color: var(--text-main);
  font-family: var(--font-sans);
  font-size: 0.92rem;
  outline: none;
  transition: var(--transition);
}

.form-input:focus, .form-select:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 2px var(--cyan-glow);
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.modal-footer {
  margin-top: 1.5rem;
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
}

.btn-primary {
  background: linear-gradient(135deg, #38bdf8 0%, #818cf8 100%);
  color: #07090e;
  font-weight: 700;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  border: none;
  cursor: pointer;
  transition: var(--transition);
}

.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 4px 15px var(--cyan-glow);
}

.btn-secondary {
  background: transparent;
  border: 1px solid var(--border-subtle);
  color: var(--text-secondary);
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.btn-secondary:hover {
  background: var(--bg-card-hover);
  color: var(--text-main);
}

/* Responsive Sidebar Drawer for Mobile & Tablets */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    height: 100vh;
    z-index: 1000;
    box-shadow: 6px 0 30px rgba(0, 0, 0, 0.65);
  }

  .sidebar.collapsed {
    margin-left: -290px;
    box-shadow: none;
  }

  .sidebar:not(.collapsed) + .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(4px);
    z-index: 999;
  }

  .sidebar.collapsed ~ .chat-container .btn-open-sidebar {
    display: inline-flex;
  }
}