/* ============================================
   Kozawa Research Team - Main Stylesheet
   Minimal + Warm Academic Design
   ============================================ */

:root {
  /* Warm neutral palette */
  --color-bg: #FDFBF7;
  --color-bg-alt: #F5F1EA;
  --color-text: #2D2A26;
  --color-text-light: #5C574F;
  --color-accent: #8B5A3C;
  --color-accent-hover: #6D4630;
  --color-border: #E5E0D8;
  
  /* Typography */
  --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-heading: 'Playfair Display', Georgia, serif;
  
  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;
  
  /* Layout */
  --max-width: 1100px;
  --max-width-narrow: 750px;
}

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

html {
  font-size: 18px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text);
}

h1 {
  font-size: 2.5rem;
  margin-bottom: var(--space-sm);
}

h2 {
  font-size: 1.8rem;
  margin-bottom: var(--space-sm);
}

h3 {
  font-size: 1.3rem;
  margin-bottom: var(--space-xs);
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* Layout */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

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

/* Header / Navigation */
.site-header {
  padding: var(--space-md) 0;
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.site-logo {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-text);
}

.site-logo:hover {
  color: var(--color-accent);
}

.site-nav {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.site-nav a {
  color: var(--color-text-light);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
}

.site-nav a:hover,
.site-nav a.active {
  color: var(--color-accent);
}

.site-nav a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

/* Hero Section */
.hero {
  padding: var(--space-xl) 0;
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: var(--space-lg);
  align-items: center;
}

.hero-content h1 {
  font-size: 3rem;
  margin-bottom: var(--space-xs);
}

.hero-tagline {
  font-size: 1.15rem;
  color: var(--color-text-light);
  margin-bottom: var(--space-md);
}

.hero-intro {
  font-size: 1.05rem;
  max-width: 600px;
}

.hero-image {
  width: 280px;
  height: 280px;
  border-radius: 50%;
  overflow: hidden;
  background: var(--color-bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 4px solid var(--color-border);
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-image--placeholder {
  font-size: 0.9rem;
  color: var(--color-text-light);
  text-align: center;
  padding: var(--space-md);
}

/* Quick Links */
.quick-links {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-md);
  flex-wrap: wrap;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  background: var(--color-accent);
  color: white;
  border-radius: 4px;
  font-weight: 500;
  font-size: 0.95rem;
  transition: background 0.2s ease;
}

.btn:hover {
  background: var(--color-accent-hover);
  color: white;
}

.btn--outline {
  background: transparent;
  border: 2px solid var(--color-accent);
  color: var(--color-accent);
}

.btn--outline:hover {
  background: var(--color-accent);
  color: white;
}

/* Page Sections */
.section {
  padding: var(--space-lg) 0;
}

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

.section-title {
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-xs);
  border-bottom: 2px solid var(--color-border);
}

/* Research Cards */
.research-grid {
  display: grid;
  gap: var(--space-md);
}

.research-card {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--space-md);
  padding: var(--space-md);
  background: white;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  transition: box-shadow 0.2s ease;
}

.research-card:hover {
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}

.research-card__image {
  width: 100%;
  border-radius: 4px;
  background: var(--color-bg-alt);
}

.research-card__number {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
  font-weight: 600;
}

.research-card__title {
  margin-bottom: var(--space-xs);
}

.research-card__text {
  color: var(--color-text-light);
  font-size: 0.95rem;
}

/* Overview Figure */
.overview-figure {
  margin: var(--space-md) 0;
  text-align: center;
}

.overview-figure img {
  max-width: 100%;
  border-radius: 8px;
}

.overview-figure figcaption {
  margin-top: var(--space-xs);
  font-size: 0.9rem;
  color: var(--color-text-light);
  font-style: italic;
}

/* Publications */
.publication-list {
  list-style: none;
}

.publication-item {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.publication-item:last-child {
  border-bottom: none;
}

.publication-title {
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.publication-authors {
  font-size: 0.95rem;
  color: var(--color-text-light);
  margin-bottom: 0.25rem;
}

.publication-journal {
  font-size: 0.9rem;
  font-style: italic;
  color: var(--color-text-light);
}

.publication-link {
  font-size: 0.9rem;
  margin-left: 0.5rem;
}

/* Teaching */
.teaching-highlight {
  background: white;
  padding: var(--space-md);
  border-radius: 8px;
  border-left: 4px solid var(--color-accent);
  margin-bottom: var(--space-md);
}

.teaching-highlight blockquote {
  font-size: 1.1rem;
  font-style: italic;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-md);
  margin: var(--space-md) 0;
}

.stat-item {
  text-align: center;
  padding: var(--space-md);
  background: white;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  color: var(--color-accent);
  font-weight: 700;
}

.stat-label {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* CV Page */
.cv-download {
  background: white;
  padding: var(--space-md);
  border-radius: 8px;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.cv-highlights {
  display: grid;
  gap: var(--space-md);
}

.cv-section h3 {
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.cv-section ul {
  list-style: none;
}

.cv-section li {
  padding: var(--space-xs) 0;
  padding-left: var(--space-sm);
  border-left: 2px solid var(--color-border);
  margin-bottom: var(--space-xs);
}

/* Contact */
.contact-info {
  background: white;
  padding: var(--space-md);
  border-radius: 8px;
  border: 1px solid var(--color-border);
  max-width: 500px;
}

.contact-item {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-border);
}

.contact-item:last-child {
  border-bottom: none;
}

.contact-label {
  font-weight: 600;
  min-width: 80px;
}

/* Footer */
.site-footer {
  padding: var(--space-md) 0;
  border-top: 1px solid var(--color-border);
  text-align: center;
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* Responsive */
@media (max-width: 900px) {
  html {
    font-size: 16px;
  }
  
  .hero {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-image {
    margin: 0 auto;
    width: 220px;
    height: 220px;
    order: -1;
  }
  
  .hero-intro {
    margin: 0 auto;
  }
  
  .quick-links {
    justify-content: center;
  }
  
  .research-card {
    grid-template-columns: 1fr;
  }
  
  .research-card__image {
    max-width: 400px;
    margin: 0 auto;
  }
}

@media (max-width: 600px) {
  .site-header .container {
    flex-direction: column;
    text-align: center;
  }
  
  .site-nav {
    justify-content: center;
  }
  
  .hero-content h1 {
    font-size: 2.2rem;
  }
  
  .cv-download {
    flex-direction: column;
    text-align: center;
  }
}

/* Utilities */
.text-center { text-align: center; }
.mt-md { margin-top: var(--space-md); }
.mb-md { margin-bottom: var(--space-md); }