/*
 * Modern Academic Website Styles
 * Copyright 2026
 * Modern, clean, responsive design with CSS Grid and Flexbox
 */

/* ==================================================
   CSS Variables for Theming
   ================================================== */
:root {
  /* Colors - Balanced Subtle Palette */
  --primary-color: #2d3436;
  --secondary-color: #5f8a9f;
  --accent-color: #6fa89f;
  --text-color: #3a3a3a;
  --text-light: #6c757d;
  --bg-color: #f8f9fa;
  --bg-alt: #e9ecef;
  --border-color: #ced4da;
  --link-color: #5f8a9f;
  --link-hover: #4a7a8f;

  /* Typography */
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-heading: "Georgia", "Times New Roman", serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;

  /* Layout */
  --max-width: 1200px;
  --sidebar-width: 280px;
  --border-radius: 8px;
  --box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  --box-shadow-lg: 0 4px 16px rgba(0, 0, 0, 0.15);

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

/* Dark Mode Variables - Balanced Dark */
@media (prefers-color-scheme: dark) {
  :root {
    --primary-color: #dfe6e9;
    --text-color: #b2bec3;
    --text-light: #636e72;
    --bg-color: #1e272e;
    --bg-alt: #2d3436;
    --border-color: #475056;
    --link-color: #74b9ff;
    --link-hover: #81ecec;
  }
}

/* ==================================================
   Reset & Base Styles
   ================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.7;
  color: var(--text-color);
  background-color: var(--bg-color);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

/* ==================================================
   Typography
   ================================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

h1:first-child, h2:first-child, h3:first-child {
  margin-top: 0;
}

h1 {
  font-size: 2.5rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
  border-bottom: 2px solid var(--border-color);
  padding-bottom: var(--spacing-xs);
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-color);
}

strong {
  font-weight: 600;
  color: var(--text-color);
}

em {
  font-style: italic;
}

/* ==================================================
   Links
   ================================================== */
a {
  color: var(--link-color);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

a:hover {
  color: var(--link-hover);
}

a:focus {
  outline: 2px solid var(--secondary-color);
  outline-offset: 2px;
}

p a {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

p a:hover {
  text-decoration-thickness: 2px;
}

/* ==================================================
   Layout - Modern Grid
   ================================================== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--spacing-lg);
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr;
  gap: var(--spacing-xl);
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  position: sticky;
  top: var(--spacing-lg);
  align-self: start;
  height: fit-content;
}

.sidebar img {
  width: 100%;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  margin-bottom: var(--spacing-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.sidebar img:hover {
  transform: scale(1.02);
  box-shadow: var(--box-shadow-lg);
}

/* Navigation */
nav {
  background: var(--bg-alt);
  border-radius: var(--border-radius);
  padding: var(--spacing-md);
  box-shadow: var(--box-shadow);
}

nav ul {
  list-style: none;
}

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

nav a {
  display: block;
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: calc(var(--border-radius) / 2);
  transition: all var(--transition-fast);
  font-weight: 500;
}

nav a:hover {
  background: var(--secondary-color);
  color: var(--bg-color);
  transform: translateX(4px);
}

/* Main Content */
.content {
  min-width: 0; /* Prevent grid blowout */
}

header h1 {
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Sections */
.doc-section {
  margin-bottom: var(--spacing-xxl);
  padding-bottom: var(--spacing-xl);
  border-bottom: 1px solid var(--border-color);
}

.doc-section:last-child {
  border-bottom: none;
}

/* ==================================================
   Lists
   ================================================== */
ul, ol {
  margin-left: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

ul.square {
  list-style: square;
}

li {
  margin-bottom: var(--spacing-xs);
  line-height: 1.7;
}

/* ==================================================
   Horizontal Rules
   ================================================== */
hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: var(--spacing-lg) 0;
}

hr.large {
  margin: var(--spacing-xl) 0;
  border-top: 2px solid var(--border-color);
}

/* ==================================================
   Publications & Academic Content
   ================================================== */
#publications p {
  background: var(--bg-alt);
  padding: var(--spacing-md);
  border-radius: var(--border-radius);
  margin-bottom: var(--spacing-md);
  border-left: 4px solid var(--secondary-color);
  transition: all var(--transition-normal);
}

#publications p:hover {
  background: var(--bg-color);
  box-shadow: var(--box-shadow);
  transform: translateX(4px);
}

#publications i {
  color: var(--text-light);
  font-size: 0.95rem;
}

/* ==================================================
   Embedded Content
   ================================================== */
iframe {
  border: none;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  margin: var(--spacing-md) 0;
  max-width: 100%;
}

object, embed {
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  margin: var(--spacing-md) 0;
}

/* ==================================================
   Responsive Design
   ================================================== */
@media (max-width: 968px) {
  .container {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
    padding: var(--spacing-md);
  }

  .sidebar {
    position: static;
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--spacing-md);
    align-items: start;
  }

  .sidebar img {
    width: 100%;
  }

  nav {
    margin-top: 0;
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  h3 {
    font-size: 1.35rem;
  }
}

@media (max-width: 640px) {
  html {
    font-size: 15px;
  }

  .container {
    padding: var(--spacing-sm);
  }

  .sidebar {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .sidebar img {
    max-width: 200px;
    margin: 0 auto var(--spacing-md);
  }

  nav a {
    text-align: left;
  }

  h1 {
    font-size: 1.75rem;
  }
}

/* ==================================================
   Accessibility
   ================================================== */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}

/* Focus visible for keyboard navigation */
:focus-visible {
  outline: 2px solid var(--secondary-color);
  outline-offset: 2px;
}

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

/* ==================================================
   Print Styles
   ================================================== */
@media print {
  body {
    background: white;
    color: black;
  }

  .container {
    display: block;
  }

  nav {
    display: none;
  }

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

  .doc-section {
    page-break-inside: avoid;
  }
}

/* ==================================================
   Utility Classes
   ================================================== */
.text-center {
  text-align: center;
}

.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.mt-sm { margin-top: var(--spacing-sm); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mb-md { margin-bottom: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }