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

:root {
  --color-primary: #1a3a5c;
  --color-primary-light: #2a5a8c;
  --color-accent: #c0392b;
  --color-bg: #f8f9fa;
  --color-white: #ffffff;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-border: #dee2e6;
  --shadow: 0 2px 12px rgba(0,0,0,0.08);
  --shadow-hover: 0 4px 20px rgba(0,0,0,0.12);
  --radius: 8px;
  --max-width: 1100px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
}

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

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

img {
  max-width: 100%;
  height: auto;
}

/* ===== Header / Nav ===== */
.site-header {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.nav-container {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
}

.nav-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-white);
  padding: 1rem 0;
  letter-spacing: 0.02em;
}

.nav-brand:hover {
  color: var(--color-white);
  opacity: 0.9;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 0.25rem;
}

.nav-links a {
  color: rgba(255,255,255,0.85);
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 500;
  transition: background 0.2s, color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  background: rgba(255,255,255,0.15);
  color: var(--color-white);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-white);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-primary);
    padding: 0.5rem 1rem 1rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links a {
    padding: 0.75rem 1rem;
  }
}

/* ===== Hero Section ===== */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-white);
  padding: 4rem 1.5rem;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 3rem;
}

.hero-photo {
  flex-shrink: 0;
}

.hero-photo img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid rgba(255,255,255,0.3);
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.hero-text h1 {
  font-size: 2.25rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.hero-text .subtitle {
  font-size: 1.15rem;
  opacity: 0.9;
  margin-bottom: 1rem;
  font-weight: 300;
}

.hero-text .tagline {
  font-size: 0.95rem;
  opacity: 0.8;
  line-height: 1.6;
}

@media (max-width: 768px) {
  .hero {
    padding: 2.5rem 1.5rem;
  }
  .hero-inner {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
  }
  .hero-text h1 {
    font-size: 1.75rem;
  }
}

/* ===== Main Content ===== */
.main-content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

/* ===== Section Titles ===== */
.section-title {
  font-size: 1.6rem;
  color: var(--color-primary);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--color-accent);
  display: inline-block;
}

/* ===== Profile / Bio ===== */
.bio-section {
  margin-bottom: 3rem;
}

.bio-text {
  font-size: 1.05rem;
  color: var(--color-text);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

/* ===== Specialties Grid ===== */
.specialties {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.specialty-card {
  background: var(--color-white);
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border-left: 4px solid var(--color-primary);
  transition: transform 0.2s, box-shadow 0.2s;
}

.specialty-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.specialty-card h3 {
  font-size: 1rem;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.specialty-card p {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* ===== Links / Ventures ===== */
.ventures {
  margin-top: 2rem;
}

.venture-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--color-white);
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-right: 1rem;
  margin-bottom: 0.75rem;
  font-weight: 500;
  transition: transform 0.2s, box-shadow 0.2s;
}

.venture-link:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

/* ===== Articles Page ===== */
.page-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
  color: var(--color-white);
  padding: 3rem 1.5rem;
  text-align: center;
}

.page-header h1 {
  font-size: 2rem;
  margin-bottom: 0.5rem;
}

.page-header p {
  opacity: 0.85;
  font-size: 1.1rem;
}

/* Filter buttons */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.5rem 1.25rem;
  border: 2px solid var(--color-border);
  border-radius: 2rem;
  background: var(--color-white);
  color: var(--color-text);
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}

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

.filter-btn.active {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-white);
}

/* Articles Grid */
.articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.article-card {
  background: var(--color-white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
}

.article-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-hover);
}

.article-card-body {
  padding: 1.5rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-type-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.3rem 0.75rem;
  border-radius: 2rem;
  width: fit-content;
  margin-bottom: 0.75rem;
}

.badge-pdf {
  background: #fdecea;
  color: #c0392b;
}

.badge-link {
  background: #e8f4fd;
  color: #2980b9;
}

.article-card-body h3 {
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

.article-card-body .article-desc {
  font-size: 0.9rem;
  color: var(--color-text-light);
  margin-bottom: 1rem;
  flex: 1;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--color-text-light);
  margin-bottom: 1rem;
}

.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.article-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.25rem;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  transition: background 0.2s;
  width: fit-content;
}

.article-link:hover {
  background: var(--color-primary-light);
  color: var(--color-white);
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--color-text-light);
}

.empty-state p {
  font-size: 1.1rem;
}

/* ===== Contact Section ===== */
.contact-section {
  background: var(--color-white);
  border-radius: var(--radius);
  padding: 2.5rem;
  box-shadow: var(--shadow);
  margin-top: 3rem;
  text-align: center;
}

.contact-section h2 {
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.contact-info {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2rem;
  margin-top: 1.5rem;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1rem;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.7);
  text-align: center;
  padding: 1.5rem;
  margin-top: 3rem;
  font-size: 0.85rem;
}

.site-footer a {
  color: rgba(255,255,255,0.9);
}

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