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

/* Core Light Theme (Default) */
:root {
  --color-bg-main: #f8fafc;       /* slate-50 */
  --color-bg-sidebar: #f1f5f9;    /* slate-100 */
  --color-bg-editor: #ffffff;     /* crisp white */
  --color-border: #e2e8f0;        /* slate-200 */
  --color-accent-emerald: #059669;/* emerald-600 */ 
  --color-accent-cyan: #0891b2;   /* cyan-600 */
  --color-text-main: #334155;     /* slate-700 standard text */
  --color-text-heading: #0f172a;  /* slate-900 bold headings */
  --color-text-sub: #64748b;      /* slate-500 secondary */
  --color-shadow: rgba(0, 0, 0, 0.03);
}

/* Core Dark Theme (Obsidian style) */
.dark-theme {
  --color-bg-main: #0b0f19;       /* deep obsidian */
  --color-bg-sidebar: #111827;    /* slate-900 panels */
  --color-bg-editor: #0c101b;     /* high-contrast editor */
  --color-border: rgba(255, 255, 255, 0.07);
  --color-accent-emerald: #10b981;/* emerald-500 */ 
  --color-accent-cyan: #06b6d4;   /* cyan-500 */
  --color-text-main: #cbd5e1;     /* slate-300 standard text */
  --color-text-heading: #f8fafc;  /* slate-50 bold headings */
  --color-text-sub: #475569;      /* slate-600 secondary */
  --color-shadow: rgba(0, 0, 0, 0.2);
}

/* Global Transition for premium theme-swapping effects */
*, *::before, *::after {
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.15s ease;
}

body {
  font-family: 'Inter', sans-serif;
  overflow-x: hidden;
  background-color: var(--color-bg-main);
  color: var(--color-text-main);
}

/* Custom Scrollbar - Advanced thin Obsidian scroll design */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--color-text-sub);
  border-radius: 9999px;
  opacity: 0.5;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent-emerald);
}

/* 🏢 Unified Theme Classes (Replaces static light/dark Tailwind bg- classes) */
.app-header {
  background-color: var(--color-bg-sidebar);
  border-color: var(--color-border);
  box-shadow: 0 1px 3px var(--color-shadow);
}

.app-sidebar {
  background-color: var(--color-bg-sidebar);
  border-color: var(--color-border);
}

.app-panel {
  background-color: var(--color-bg-main);
  border-color: var(--color-border);
}

.app-editor-canvas {
  background-color: var(--color-bg-editor);
}

.app-input {
  background-color: var(--color-bg-editor) !important;
  border-color: var(--color-border) !important;
  color: var(--color-text-main) !important;
}

.app-input:hover {
  border-color: var(--color-accent-emerald) !important;
  color: var(--color-text-heading) !important;
}

.app-text-heading {
  color: var(--color-text-heading);
}

.app-text-main {
  color: var(--color-text-main);
}

.app-text-sub {
  color: var(--color-text-sub);
}

/* Professional Editor & Gutter Synced Metrics */
.editor-font {
  font-family: 'Fira Code', monospace;
  font-size: 13.5px;
  line-height: 1.75;
  letter-spacing: -0.01em;
}

.editor-textarea {
  font-family: 'Fira Code', monospace;
  font-size: 13.5px;
  line-height: 1.75;
  letter-spacing: -0.01em;
  resize: none;
  tab-size: 4;
  outline: none;
  background: transparent;
  color: var(--color-text-heading);
}

/* Gutter Styling - High Legibility IDE Style */
.editor-gutter-line {
  height: 23.625px; /* Perfect math alignment for line-height 1.75 of 13.5px text */
  line-height: 23.625px;
  padding-right: 12px;
  font-family: 'Fira Code', monospace;
  font-size: 12px;
  color: var(--color-text-sub);
  text-align: right;
  transition: all 0.15s ease;
}

/* Glassmorphism Panel styles */
.glass-panel {
  background: var(--color-bg-sidebar);
  border: 1px solid var(--color-border);
}

.glass-card {
  background-color: var(--color-bg-editor);
  border: 1px solid var(--color-border);
  box-shadow: 0 1px 3px var(--color-shadow);
  transition: all 0.2s ease;
}

.glass-card:hover {
  border-color: var(--color-accent-emerald);
  box-shadow: 0 4px 6px -1px var(--color-shadow);
  transform: translateY(-1px);
}

/* Interactive Table Grid - Emerald Hover Coordinates */
.grid-square {
  transition: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-editor);
}

.grid-square.active {
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.15) 0%, rgba(6, 182, 212, 0.15) 100%);
  border-color: var(--color-accent-emerald);
  box-shadow: 0 0 6px var(--color-accent-emerald);
  transform: scale(1.05);
}

/* 📄 Live Markdown HTML Preview Custom Prose (Stripe & Obsidian standards) */
.markdown-body {
  font-family: 'Inter', sans-serif;
  color: var(--color-text-main);
  line-height: 1.75;
  font-size: 14.5px;
}

.markdown-body h1 {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-heading);
  letter-spacing: -0.02em;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.5rem;
  margin-top: 2rem;
  margin-bottom: 1.25rem;
}

.markdown-body h2 {
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-text-heading);
  letter-spacing: -0.015em;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.25rem;
  margin-top: 1.75rem;
  margin-bottom: 1rem;
}

.markdown-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text-heading);
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
}

.markdown-body h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--color-text-main);
  margin-top: 1.25rem;
  margin-bottom: 0.5rem;
}

.markdown-body p {
  margin-top: 0;
  margin-bottom: 1.15rem;
  color: var(--color-text-main); 
}

.markdown-body strong {
  color: var(--color-text-heading);
  font-weight: 600;
}

.markdown-body a {
  color: var(--color-accent-emerald);
  text-decoration: none;
  font-weight: 500;
  border-bottom: 1px dashed var(--color-accent-emerald);
  transition: all 0.2s ease;
}

.markdown-body a:hover {
  color: var(--color-accent-emerald);
  border-bottom-style: solid;
}

/* Publishing-grade Code tags */
.markdown-body code {
  font-family: 'Fira Code', monospace;
  font-size: 0.85rem;
  background-color: var(--color-bg-sidebar); 
  color: var(--color-accent-cyan);
  padding: 0.15rem 0.35rem;
  border-radius: 0.375rem;
  border: 1px solid var(--color-border);
}

/* Code Blocks: Tech-publishing dark-block standard for maximum read syntax highlighting */
.markdown-body pre {
  margin-top: 0;
  margin-bottom: 1.25rem;
  padding: 1.15rem;
  background-color: #0c101b; /* elegant dark block for code remains consistent */
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 0.5rem;
  overflow-x: auto;
}

.markdown-body pre code {
  background-color: transparent;
  color: #e2e8f0;
  padding: 0;
  border: none;
  font-size: 0.825rem;
}

.markdown-body blockquote {
  margin: 0 0 1.25rem 0;
  padding: 0.6rem 1.15rem;
  color: var(--color-text-main);
  border-left: 3px solid var(--color-accent-emerald);
  background-color: rgba(16, 185, 129, 0.015);
  border-radius: 0 0.375rem 0.375rem 0;
  font-style: italic;
}

.markdown-body ul, .markdown-body ol {
  margin-top: 0;
  margin-bottom: 1.25rem;
  padding-left: 1.4rem;
  color: var(--color-text-main);
}

.markdown-body ul {
  list-style-type: disc;
}

.markdown-body ol {
  list-style-type: decimal;
}

.markdown-body li {
  margin-top: 0.3rem;
  margin-bottom: 0.3rem;
}

/* Beautiful Stripe-style minimalist tables */
.markdown-body table {
  width: 100%;
  margin-top: 0.75rem;
  margin-bottom: 1.5rem;
  border-collapse: collapse;
  border-radius: 0.5rem;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.markdown-body th {
  background-color: var(--color-bg-sidebar);
  color: var(--color-text-main); 
  font-weight: 500;
  font-size: 12.5px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.85rem 1rem;
  text-align: left;
  border-bottom: 1.5px solid var(--color-border);
}

.markdown-body td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--color-border);
  font-size: 13.5px;
  color: var(--color-text-main);
}

.markdown-body tr:last-child td {
  border-bottom: none;
}

.markdown-body tr:nth-child(even) {
  background-color: rgba(255, 255, 255, 0.005);
}

.dark-theme .markdown-body tr:nth-child(even) {
  background-color: rgba(0, 0, 0, 0.08);
}

/* KaTeX custom style equations */
.markdown-body .katex-display {
  padding: 1rem;
  margin: 1.25rem 0;
  background-color: var(--color-bg-sidebar);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  overflow-x: auto;
  overflow-y: hidden;
}

.markdown-body .katex {
  color: var(--color-accent-emerald);
  font-size: 1.02em;
}

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

.animate-toast {
  animation: fadeInUp 0.2s forwards;
}

/* Highlight line number on hover of matching editor line */
.editor-gutter-line.active {
  color: var(--color-accent-emerald);
  background: rgba(16, 185, 129, 0.08);
}