/* AVIHPSAM Design System - main.css */
/* Version 1.0 | Dignified, Scholarly, Accessible */

/* ============================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ============================================ */

:root {
  /* Colors - Dignified, Scholarly Palette */
  --color-primary: #8B4513;        /* Saddle Brown - earthy, traditional */
  --color-primary-dark: #6B3410;   /* Darker brown for hover states */
  --color-primary-light: #A5642A;  /* Lighter brown for accents */
  --color-secondary: #D4A574;      /* Tan - warm, inviting */
  --color-accent: #2E5A4C;         /* Deep green - scholarly */
  --color-accent-light: #3D7A66;   /* Lighter green */
  --color-background: #FDF8F3;     /* Warm white - easy on eyes */
  --color-background-alt: #F5EDE4; /* Slightly darker for sections */
  --color-surface: #FFFFFF;        /* Card backgrounds */
  --color-text: #2C2C2C;           /* Near black - readable */
  --color-text-light: #666666;     /* Gray - secondary text */
  --color-text-muted: #888888;     /* Muted text */
  --color-border: #E0D5C9;         /* Soft border color */
  --color-border-light: #EDE7DF;   /* Lighter border */

  /* Evidence Tier Colors */
  --tier-1: #2E7D32;               /* Green - strong evidence */
  --tier-1-bg: rgba(46, 125, 50, 0.08);
  --tier-2: #F9A825;               /* Amber - living tradition */
  --tier-2-bg: rgba(249, 168, 37, 0.08);
  --tier-3: #1976D2;               /* Blue - hypothesis */
  --tier-3-bg: rgba(25, 118, 210, 0.08);
  --tier-4: #C62828;               /* Red - flagged/popular claim */
  --tier-4-bg: rgba(198, 40, 40, 0.08);

  /* Typography */
  --font-heading: 'Playfair Display', Georgia, serif;
  --font-body: 'Source Sans Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-sanskrit: 'Noto Sans Devanagari', 'Siddhanta', sans-serif;
  --font-mono: 'Source Code Pro', Consolas, monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */

  /* Font Weights */
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Line Heights */
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.7;
  --leading-loose: 2;

  /* Spacing Scale */
  --space-xs: 0.25rem;     /* 4px */
  --space-sm: 0.5rem;      /* 8px */
  --space-md: 1rem;        /* 16px */
  --space-lg: 1.5rem;      /* 24px */
  --space-xl: 2rem;        /* 32px */
  --space-2xl: 3rem;       /* 48px */
  --space-3xl: 4rem;       /* 64px */
  --space-4xl: 6rem;       /* 96px */

  /* Border Radius */
  --radius-sm: 0.25rem;    /* 4px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.12);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 800px;
  --max-width-wide: 1400px;
  --header-height: 70px;
  --footer-height: 200px;
}

/* ============================================
   CSS RESET & BASE STYLES
   ============================================ */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-relaxed);
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: var(--font-semibold);
  color: var(--color-primary);
  line-height: var(--leading-tight);
  margin-bottom: var(--space-md);
}

h1 {
  font-size: var(--text-4xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-3xl);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--text-2xl);
}

h4 {
  font-size: var(--text-xl);
}

h5 {
  font-size: var(--text-lg);
}

h6 {
  font-size: var(--text-base);
}

p {
  margin-bottom: var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-light);
  text-decoration: underline;
}

strong, b {
  font-weight: var(--font-semibold);
}

em, i {
  font-style: italic;
}

small {
  font-size: var(--text-sm);
}

/* Sanskrit/Hindi Text */
.sanskrit, .hindi, [lang="sa"], [lang="hi"] {
  font-family: var(--font-sanskrit);
}

.sanskrit-large {
  font-family: var(--font-sanskrit);
  font-size: var(--text-2xl);
  color: var(--color-primary);
}

/* Blockquotes - for textual citations */
blockquote {
  border-left: 4px solid var(--color-secondary);
  padding: var(--space-md) var(--space-lg);
  margin: var(--space-lg) 0;
  background-color: var(--color-background-alt);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  font-style: italic;
}

blockquote cite {
  display: block;
  margin-top: var(--space-sm);
  font-style: normal;
  font-size: var(--text-sm);
  color: var(--color-text-light);
}

/* Lists */
ul, ol {
  margin-bottom: var(--space-md);
  padding-left: var(--space-xl);
}

li {
  margin-bottom: var(--space-xs);
}

li::marker {
  color: var(--color-primary);
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--color-background-alt);
  padding: 0.1em 0.3em;
  border-radius: var(--radius-sm);
}

pre {
  font-family: var(--font-mono);
  background-color: var(--color-text);
  color: var(--color-background);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--space-md);
}

pre code {
  background: none;
  padding: 0;
}

/* Horizontal Rule */
hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-xl) 0;
}

/* ============================================
   LAYOUT UTILITIES
   ============================================ */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container-narrow {
  max-width: var(--max-width-narrow);
}

.container-wide {
  max-width: var(--max-width-wide);
}

.section {
  padding: var(--space-3xl) 0;
}

.section-alt {
  background-color: var(--color-background-alt);
}

/* Flexbox Utilities */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

.items-center {
  align-items: center;
}

.items-start {
  align-items: flex-start;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

.gap-sm {
  gap: var(--space-sm);
}

.gap-md {
  gap: var(--space-md);
}

.gap-lg {
  gap: var(--space-lg);
}

.gap-xl {
  gap: var(--space-xl);
}

/* Grid Utilities */
.grid {
  display: grid;
}

.grid-cols-2 {
  grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* Text Utilities */
.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

.text-muted {
  color: var(--color-text-muted);
}

.text-light {
  color: var(--color-text-light);
}

.text-primary {
  color: var(--color-primary);
}

.text-accent {
  color: var(--color-accent);
}

/* Spacing Utilities */
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

.py-sm { padding-top: var(--space-sm); padding-bottom: var(--space-sm); }
.py-md { padding-top: var(--space-md); padding-bottom: var(--space-md); }
.py-lg { padding-top: var(--space-lg); padding-bottom: var(--space-lg); }
.py-xl { padding-top: var(--space-xl); padding-bottom: var(--space-xl); }

/* Visibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ============================================
   HEADER
   ============================================ */

.header {
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 var(--space-lg);
  max-width: var(--max-width-wide);
  margin: 0 auto;
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
}

.header-logo-text {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  color: var(--color-primary);
  letter-spacing: 0.05em;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.header-nav-link {
  font-size: var(--text-base);
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.header-nav-link:hover {
  background-color: var(--color-background-alt);
  color: var(--color-primary);
  text-decoration: none;
}

.header-nav-link.active {
  color: var(--color-primary);
  font-weight: var(--font-medium);
}

/* Search Link in Header */
.header-search-link {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm);
  font-size: var(--text-lg);
}

.header-search-link:hover {
  background-color: var(--color-background-alt);
}

/* Chat Link in Header */
.header-chat-link {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
  background-color: var(--color-primary);
  color: white !important;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  transition: background-color var(--transition-fast);
}

.header-chat-link:hover {
  background-color: var(--color-primary-dark);
  color: white !important;
}

.header-chat-link.active {
  background-color: var(--color-primary-dark);
}

/* Screen Reader Only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Chat Button in Header */
.header-chat-btn {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-md);
  background-color: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: var(--font-medium);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.header-chat-btn:hover {
  background-color: var(--color-accent-light);
}

/* Mobile Menu Toggle */
.header-menu-toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-sm);
  cursor: pointer;
}

.header-menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-text);
  margin: 5px 0;
  transition: all var(--transition-fast);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background-color: var(--color-primary);
  color: var(--color-background);
  margin-top: auto;
  padding: var(--space-2xl) 0 var(--space-lg);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}

.footer-brand h3 {
  color: var(--color-background);
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
}

.footer-brand p {
  color: var(--color-secondary);
  font-size: var(--text-base);
}

.footer-brand a {
  color: var(--color-accent-light);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-brand a:hover {
  color: var(--color-background);
}

.footer-links h4 {
  color: var(--color-background);
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  margin-bottom: var(--space-sm);
}

.footer-links a {
  color: var(--color-secondary);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--color-background);
  text-decoration: none;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  padding-top: var(--space-lg);
  text-align: center;
  font-size: var(--text-sm);
  color: var(--color-secondary);
}

/* ============================================
   MAIN CONTENT AREA
   ============================================ */

.main {
  flex: 1;
  padding-top: var(--space-xl);
  padding-bottom: var(--space-2xl);
}

/* Page Header */
.page-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.page-header h1 {
  margin-bottom: var(--space-sm);
}

.page-header .subtitle {
  font-size: var(--text-xl);
  color: var(--color-text-light);
}

/* ============================================
   SELECTION & FOCUS STYLES
   ============================================ */

::selection {
  background-color: var(--color-secondary);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

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

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

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

/* ============================================
   ACCESSIBILITY ENHANCEMENTS
   ============================================ */

/* Skip link for keyboard users */
.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  right: 0;
  background: var(--color-accent);
  color: white;
  padding: var(--space-md);
  text-align: center;
  z-index: 10000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: 0;
}

/* Enhanced focus indicators for interactive elements */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* High contrast focus for buttons */
.btn:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(46, 90, 76, 0.25);
}

/* Focus within for form groups */
.form-group:focus-within {
  background-color: rgba(46, 90, 76, 0.05);
  border-radius: var(--radius-md);
}

/* Visible focus for tab navigation */
.tab:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: -3px;
}

/* Card focus states */
.card:focus-within,
.topic-card:focus-within,
.domain-card:focus-within {
  box-shadow: var(--shadow-lg), 0 0 0 3px var(--color-accent);
}

/* Link focus in content areas */
article a:focus-visible,
.topic-content a:focus-visible {
  background-color: rgba(46, 90, 76, 0.1);
  border-radius: var(--radius-sm);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  :root {
    --color-text: #000000;
    --color-background: #FFFFFF;
    --color-border: #000000;
  }

  .tier-badge {
    border: 2px solid currentColor;
  }

  .card,
  .topic-card,
  .domain-card {
    border: 2px solid var(--color-text);
  }

  a {
    text-decoration: underline;
  }
}

/* Visible focus ring for all focusable elements */
*:focus {
  outline: none;
}

*:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

/* Remove focus ring for mouse clicks but keep for keyboard */
button:focus:not(:focus-visible),
a:focus:not(:focus-visible) {
  outline: none;
}

/* Ensure sufficient line height for readability */
body {
  line-height: var(--leading-relaxed);
}

/* Ensure links are distinguishable - exclude navigation and card elements */
a:not(.btn):not(.header-nav-link):not(.card):not(.topic-card):not(.sidebar-nav-link):not(.category-link):not(.domain-card):not(.mode-card):not(.source-card):not(.search-result-card):not(.search-result-link):not(.external-link-card):not(.resource-link):not(.related-topic-link):not(.skip-link):not(.back-link):not(.header-logo):not(.toc-link):not(.toc-related-link):not(.scholar-card):not(.contribution-card):not(.topic-link) {
  text-decoration: underline;
  text-decoration-color: var(--color-accent);
  text-underline-offset: 2px;
}

a:not(.btn):not(.header-nav-link):not(.card):not(.topic-card):not(.sidebar-nav-link):not(.category-link):not(.domain-card):not(.mode-card):not(.source-card):not(.search-result-card):not(.search-result-link):not(.external-link-card):not(.resource-link):not(.related-topic-link):not(.skip-link):not(.back-link):not(.header-logo):not(.toc-link):not(.toc-related-link):not(.scholar-card):not(.contribution-card):not(.topic-link):hover {
  text-decoration-thickness: 2px;
}

/* Target size for touch devices */
@media (pointer: coarse) {
  .btn,
  .tab,
  .header-nav-link,
  .suggestion {
    min-height: 44px;
    min-width: 44px;
  }
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  .header,
  .footer,
  .chat-panel,
  .header-chat-btn {
    display: none !important;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
    color: black;
    background: white;
  }

  a {
    color: black;
    text-decoration: underline;
  }

  .container {
    max-width: 100%;
    padding: 0;
  }
}