/* Beengineer — Modern Academic Design System
   Precision Academic OS for Engineers
*/

:root {
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  /* Primary Light Theme Colors */
  --color-primary: #004ac6;
  --color-primary-container: #2563eb;
  --color-primary-dark: #1d4ed8;
  --color-primary-fixed: #dbe1ff;
  --color-on-primary: #ffffff;
  
  --color-secondary: #712ae2;
  --color-secondary-container: #8a4cfc;
  --color-secondary-dark: #6d28d9;
  --color-secondary-fixed: #eaddff;
  --color-on-secondary: #ffffff;

  --color-surface: #f8f9ff;
  --color-surface-lowest: #ffffff;
  --color-surface-low: #eff4ff;
  --color-surface-container: #e5eeff;
  --color-surface-high: #dce9ff;
  --color-surface-highest: #d3e4fe;
  
  --color-on-surface: #0b1c30;
  --color-on-surface-variant: #434655;
  --color-tertiary: #4d556b;
  --color-outline: #737686;
  --color-outline-variant: #c3c6d7;
  --color-border: #e2e8f0;
}

.dark {
  --color-surface: #0b1329;
  --color-surface-lowest: #0f172a;
  --color-surface-low: #1e293b;
  --color-surface-container: #283548;
  --color-surface-high: #334155;
  --color-surface-highest: #475569;
  
  --color-on-surface: #f8fafc;
  --color-on-surface-variant: #cbd5e1;
  --color-tertiary: #94a3b8;
  --color-outline: #94a3b8;
  --color-outline-variant: #334155;
  --color-border: #1e293b;
}

/* Base resets & typography */
html, body {
  margin: 0;
  padding: 0;
  width: 100%;
  min-height: 100vh;
  overflow-x: hidden;
  font-family: var(--font-sans);
  background-color: var(--color-surface);
  color: var(--color-on-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.2s ease, color 0.2s ease;
}

*, *::before, *::after {
  box-sizing: border-box;
}

h1, h2, h3, h4, .font-display {
  font-family: var(--font-display);
}

/* Background Subtle Dot Grid */
.bg-grid-subtle {
  background-image: radial-gradient(rgba(37, 99, 235, 0.08) 1px, transparent 1px);
  background-size: 24px 24px;
}

.dark .bg-grid-subtle {
  background-image: radial-gradient(rgba(147, 197, 253, 0.08) 1px, transparent 1px);
}

/* Dark Mode Form Input Overrides */
.dark input[type="text"],
.dark input[type="number"],
.dark textarea,
.dark select {
  background-color: #1e293b !important;
  color: #f8fafc !important;
  border-color: #334155 !important;
}

.dark input::placeholder,
.dark textarea::placeholder {
  color: #64748b !important;
}

/* Clean Custom Scrollbar */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 9999px;
}

.dark ::-webkit-scrollbar-thumb {
  background: #334155;
}

::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* Mathematical Formula Sandboxed Blocks */
.formula-block {
  background-color: var(--color-surface-low);
  border-left: 3px solid var(--color-primary-container);
  border-radius: 0.5rem;
  padding: 0.75rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-primary);
  overflow-x: auto;
  word-break: break-word;
}

.dark .formula-block {
  background-color: #1e293b;
  color: #93c5fd;
  border-left-color: #3b82f6;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes progressLoad {
  0% { width: 0%; }
  25% { width: 35%; }
  60% { width: 75%; }
  100% { width: 100%; }
}

.animate-fade-in {
  animation: fadeIn 0.35s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.progress-fill {
  animation: progressLoad 2.2s cubic-bezier(0.22, 1, 0.36, 1) 0.3s forwards;
}

/* Sidebar & Navigation active states */
.nav-item-active {
  background-color: #2563eb !important;
  color: #ffffff !important;
  font-weight: 600 !important;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25) !important;
}

.nav-item-active .material-symbols-outlined {
  color: #ffffff !important;
}

/* Hide / Show View Utility */
.app-view {
  display: none;
  opacity: 0;
  transition: opacity 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.app-view.active-view {
  display: flex !important;
  flex-direction: column !important;
  opacity: 1;
}

/* Card hover and elevation enhancements */
.card-academic {
  background-color: var(--color-surface-lowest);
  border: 1px solid var(--color-outline-variant);
  border-color: rgba(195, 198, 215, 0.45);
  border-radius: 1rem;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

.dark .card-academic {
  border-color: rgba(51, 65, 85, 0.8);
}

.card-academic:hover {
  border-color: rgba(37, 99, 235, 0.4);
  box-shadow: 0 10px 25px -5px rgba(0, 74, 198, 0.08), 0 8px 10px -6px rgba(0, 74, 198, 0.04);
}

/* Chat bubble styling */
.chat-bubble-user {
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: #ffffff;
  border-radius: 1.25rem 1.25rem 0.25rem 1.25rem;
}

.chat-bubble-ai {
  background: var(--color-surface-lowest);
  border: 1px solid var(--color-outline-variant);
  color: var(--color-on-surface);
  border-radius: 1.25rem 1.25rem 1.25rem 0.25rem;
}

/* Line clamp */
.line-clamp-1 {
  display: -webkit-box;
  -webkit-line-clamp: 1;
  line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.line-clamp-2 {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Quick Language Selector Pill */
.lang-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.025em;
  background-color: var(--color-surface-low);
  color: var(--color-on-surface);
  border: 1px solid var(--color-outline-variant);
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-toggle-btn:hover {
  background-color: var(--color-surface-container);
  border-color: var(--color-primary-container);
  color: var(--color-primary-container);
}

/* Interactive Onboarding Selection Pills */
.pill-option {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  padding: 0.625rem 0.75rem;
  border-radius: 0.75rem;
  font-size: 0.8125rem;
  font-weight: 600;
  background-color: var(--color-surface-low);
  color: var(--color-on-surface);
  border: 1px solid var(--color-outline-variant);
  border-color: rgba(195, 198, 215, 0.5);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  user-select: none;
}

.dark .pill-option {
  background-color: #1e293b;
  border-color: #334155;
  color: #f8fafc;
}

.pill-option:hover {
  border-color: #2563eb;
  background-color: var(--color-surface-container);
  color: #2563eb;
}

.dark .pill-option:hover {
  background-color: #334155;
  border-color: #3b82f6;
  color: #93c5fd;
}

.pill-option.active-pill {
  background: linear-gradient(135deg, #2563eb, #1d4ed8) !important;
  color: #ffffff !important;
  border-color: #2563eb !important;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3) !important;
}

.dark .pill-option.active-pill {
  background: linear-gradient(135deg, #3b82f6, #2563eb) !important;
  color: #ffffff !important;
  border-color: #3b82f6 !important;
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.35) !important;
}

/* Modal scale-in and fade-out animations */
.modal-overlay-entering {
  opacity: 0;
}
.modal-overlay-entered {
  opacity: 1;
}
.modal-overlay-leaving {
  opacity: 0;
  pointer-events: none;
}

.modal-card-entering {
  opacity: 0;
  transform: scale(0.95) translateY(8px);
}
.modal-card-entered {
  opacity: 1;
  transform: scale(1) translateY(0);
}
.modal-card-leaving {
  opacity: 0;
  transform: scale(0.95) translateY(-8px);
}