/* ========================================================================= */
/* CSS/COMMON.CSS - Smart Notes Core Design System                           */
/* ========================================================================= */

:root {
  /* Common Design Constants */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-display: 'Outfit', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', Courier, monospace;
  
  --transition-smooth: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  
  /* Light Theme Tokens */
  --bg-primary: #ffffff;
  --bg-secondary: #fafafa;
  --bg-tertiary: #f3f4f6;
  --text-primary: #111111;
  --text-secondary: #555555;
  --text-muted: #888888;
  --border-color: #e5e7eb;
  --border-active: #111111;
  --cobalt: #0047ab;
  --cobalt-hover: #003682;
  --cobalt-light: #eff6ff;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
  --selection-bg: rgba(0, 71, 171, 0.12);
  --selection-color: inherit;
}

[data-theme="dark"] {
  /* Dark Theme Tokens */
  --bg-primary: #0a0a0a;
  --bg-secondary: #121212;
  --bg-tertiary: #1c1c1c;
  --text-primary: #f3f4f6;
  --text-secondary: #a3a3a3;
  --text-muted: #666666;
  --border-color: #262626;
  --border-active: #ffffff;
  --cobalt: #2563eb;
  --cobalt-hover: #3b82f6;
  --cobalt-light: #172554;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
  --selection-bg: rgba(37, 99, 235, 0.25);
  --selection-color: #ffffff;
}

/* Base Reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  width: 100%;
  height: 100%;
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Custom Text Highlight */
::selection {
  background-color: var(--selection-bg);
  color: var(--selection-color);
}

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

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 0px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* Hide helper classes */
.hidden {
  display: none !important;
}

.invisible {
  opacity: 0;
  pointer-events: none;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.2rem;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1;
  text-decoration: none;
  cursor: pointer;
  border-radius: 0px; /* Square by design */
  border: 1px solid transparent;
  background-color: transparent;
  color: var(--text-primary);
  transition: var(--transition-smooth);
}

.btn-primary {
  background-color: var(--text-primary);
  color: var(--bg-primary);
  border-color: var(--text-primary);
}

.btn-primary:hover {
  background-color: var(--bg-primary);
  color: var(--text-primary);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--text-primary);
}

.btn-cobalt {
  background-color: var(--cobalt);
  color: #ffffff;
  border-color: var(--cobalt);
}

.btn-cobalt:hover {
  background-color: var(--cobalt-hover);
  border-color: var(--cobalt-hover);
}

.btn-outline {
  border: 1px solid var(--border-color);
  background-color: transparent;
  color: var(--text-primary);
}

.btn-outline:hover {
  border-color: var(--text-active);
  background-color: var(--bg-secondary);
}

.btn-large {
  padding: 0.8rem 1.6rem;
  font-size: 1rem;
}

.btn-full {
  width: 100%;
}

.btn-small-action {
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
}

/* Icon Buttons */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid transparent;
  background: transparent;
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition-smooth);
}

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

.icon-btn:active {
  background-color: var(--bg-tertiary);
}

/* Icon utility sizes */
.icon-thin {
  stroke-width: 1.25px !important;
  width: 20px;
  height: 20px;
}

.icon-thin-inline {
  stroke-width: 1.25px !important;
  width: 16px;
  height: 16px;
  margin-right: 6px;
  vertical-align: text-top;
}

.icon-cobalt {
  color: var(--cobalt);
}

.icon-spin {
  animation: spinner 6s linear infinite;
}

/* Global Animations */
@keyframes spinner {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Focus styles */
input:focus, textarea:focus, select:focus, [contenteditable="true"]:focus {
  outline: none;
}

/* Layout views */
.view-container {
  display: none;
  flex-direction: column;
  width: 100%;
  height: 100%;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.view-container.active {
  display: flex;
  opacity: 1;
}

/* Responsive Desktop utilities */
@media (max-width: 768px) {
  .desktop-only {
    display: none !important;
  }
}