/* Elegant Beige, Black & White Design System */
:root {
  --bg-main: #0F172A;         /* Deep Slate Blue background */
  --bg-dark-block: #1E293B;   /* Muted Slate card/section background */
  --text-on-light: #F8FAFC;   /* Crisp Off-White text */
  --text-on-dark: #F8FAFC;    /* Crisp Off-White text */
  --text-muted-light: #94A3B8;/* Muted Slate Gray details */
  --text-muted-dark: #94A3B8; /* Muted Slate Gray details */
  --border-light: #334155;    /* Slate-700 border */
  --border-dark: #334155;     /* Slate-700 border */
  --accent: #38BDF8;          /* Electric Sky Blue */
  --accent-alt: #818CF8;      /* Indigo */
  --font-sans: 'Outfit', sans-serif;
  --font-mono: 'Fira Code', monospace;
  --transition-smooth: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  --border-radius-lg: 8px;
  --border-radius-md: 4px;
}

/* Global resets */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-main);
  color: var(--text-on-light);
  font-family: var(--font-sans);
  line-height: 1.6;
}

/* Section borders */
section {
  padding: 80px 8%;
  border-bottom: 1px solid var(--border-light);
}

/* Navigation Bar (Sleek Black Block) */
.navbar-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 8%;
  background-color: var(--bg-dark-block);
  border-bottom: 2px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 100;
}

.logo {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-on-dark);
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
}

.nav-links a {
  color: var(--text-muted-dark);
  font-weight: 500;
  transition: var(--transition-smooth);
}

.nav-links a:hover {
  color: var(--text-on-dark);
  text-decoration: underline;
}

/* Section Title formatting */
.section-title {
  font-size: 2.2rem;
  margin-bottom: 10px;
  text-align: center;
  color: var(--text-on-light);
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 2px;
  background-color: var(--accent);
  margin: 12px auto 0;
}

.section-subtitle {
  color: var(--text-muted-light);
  text-align: center;
  margin-bottom: 40px;
  font-size: 0.95rem;
}

/* Hero Section layout */
.hero-section {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 70vh;
}

.badge {
  display: inline-block;
  background-color: rgba(56, 189, 248, 0.1);
  color: var(--accent);
  border: 1px solid rgba(56, 189, 248, 0.2);
  padding: 6px 14px;
  border-radius: var(--border-radius-md);
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 25px;
  font-family: var(--font-mono);
}

.hero-section h1 {
  font-size: 3.8rem;
  line-height: 1.1;
  margin-bottom: 20px;
  color: var(--text-on-light);
}

.tagline {
  font-size: 1.25rem;
  color: var(--text-muted-light);
  max-width: 700px;
  margin-bottom: 35px;
}

.btn-primary {
  background-color: var(--accent);
  color: var(--bg-main);
  padding: 12px 28px;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  display: inline-block;
  border: 2px solid var(--accent);
  transition: var(--transition-smooth);
  text-decoration: none;
}

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

/* About Grid Layout */
.about-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 40px;
}

.about-text p {
  margin-bottom: 20px;
  font-size: 1.05rem;
  color: var(--text-on-light);
}

/* Quick Facts (Black Box, White Text) */
.quick-facts-box {
  background-color: var(--bg-dark-block);
  color: var(--text-on-dark);
  padding: 24px;
  border-radius: var(--border-radius-lg);
  margin-top: 30px;
}

.quick-facts-box h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-dark);
  padding-bottom: 8px;
  color: var(--text-on-dark);
}

.facts-list {
  list-style: none;
}

.facts-list li {
  margin-bottom: 10px;
  font-size: 0.95rem;
  color: var(--text-muted-dark);
}

.facts-list li strong {
  color: var(--text-on-dark);
  display: inline-block;
  width: 140px;
}

.facts-list li a {
  color: var(--text-on-dark);
  text-decoration: underline;
}

/* Stats (Black Box, White Text) */
.about-stats-box {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.stat-card {
  background-color: var(--bg-dark-block);
  color: var(--text-on-dark);
  border-radius: var(--border-radius-lg);
  padding: 25px;
  text-align: center;
  transition: var(--transition-smooth);
}

.stat-card:hover {
  transform: translateY(-2px);
}

.stat-number {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  color: var(--accent-alt);
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted-dark);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Styled Table (Black Background, White Text, Syllabus compliant) */
.table-container {
  overflow-x: auto;
  margin: 40px 0;
  border-radius: var(--border-radius-lg);
  border: 2px solid var(--bg-dark-block);
}

.skills-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  background-color: var(--bg-dark-block);
  color: var(--text-on-dark);
  font-size: 0.95rem;
}

.skills-table th {
  background-color: rgba(255, 255, 255, 0.05);
  color: var(--text-on-dark);
  padding: 18px 24px;
  font-weight: 600;
  border-bottom: 2px solid var(--border-dark);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.skills-table td {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-dark);
  color: var(--text-muted-dark);
}

.skills-table tbody tr:hover td {
  background-color: rgba(255, 255, 255, 0.02);
  color: var(--text-on-dark);
}

.category-cell {
  color: var(--text-on-dark) !important;
  font-weight: 600;
  font-family: var(--font-mono);
}

/* Skill Box Framework (Black Box, White Text) */
.skills-boxes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
  margin-top: 30px;
}

.skill-box {
  background-color: var(--bg-dark-block);
  color: var(--text-on-dark);
  padding: 30px;
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--border-dark);
  transition: var(--transition-smooth);
}

.skill-box:hover {
  transform: translateY(-2px);
}

.skill-icon {
  font-size: 2rem;
  margin-bottom: 15px;
}

.skill-box h3 {
  font-size: 1.3rem;
  margin-bottom: 15px;
}

.skills-list {
  list-style: none;
}

.skills-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 10px;
  font-size: 0.95rem;
  color: var(--text-muted-dark);
}

.skills-list li::before {
  content: '▪';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 1rem;
}

/* Dynamic Projects Layout (Black Boxes, White Text) */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
  gap: 30px;
  transition: opacity 0.2s ease-in-out;
}

.project-card {
  background-color: var(--bg-dark-block);
  color: var(--text-on-dark);
  border-radius: var(--border-radius-lg);
  padding: 30px;
  display: flex;
  flex-direction: column;
  transition: var(--transition-smooth);
  border: 1px solid var(--border-dark);
}

.project-card:hover {
  transform: translateY(-4px);
}

.project-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

.project-icon-box {
  font-size: 1.5rem;
}

.project-category-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-on-dark);
  border: 1px solid var(--border-dark);
  padding: 3px 10px;
  border-radius: var(--border-radius-md);
}

.project-card h3 {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.project-card p {
  color: var(--text-muted-dark);
  font-size: 0.95rem;
  margin-bottom: 25px;
  flex-grow: 1;
}

.project-tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
  margin-top: auto;
}

.tech-tag {
  background-color: var(--bg-main);
  border: 1px solid var(--border-dark);
  color: var(--text-muted-dark);
  padding: 4px 10px;
  border-radius: var(--border-radius-md);
  font-size: 0.75rem;
  font-family: var(--font-mono);
}

/* Beautiful Action Button inside cards */
.project-link-btn {
  background-color: var(--accent);
  color: var(--bg-main);
  padding: 10px 20px;
  border-radius: var(--border-radius-md);
  font-size: 0.85rem;
  font-weight: 600;
  display: inline-block;
  text-align: center;
  width: max-content;
  border: 2px solid var(--accent);
  transition: var(--transition-smooth);
}

.project-link-btn:hover {
  background-color: transparent;
  color: var(--accent);
  cursor: pointer;
}

/* Contact Block Layout */
.contact-section {
  display: flex;
  justify-content: center;
}

.contact-card {
  background-color: var(--bg-dark-block);
  color: var(--text-on-dark);
  border-radius: var(--border-radius-lg);
  padding: 40px;
  text-align: center;
  max-width: 700px;
  width: 100%;
}

.contact-card h2 {
  font-size: 2rem;
  margin-bottom: 15px;
}

.contact-card p {
  color: var(--text-muted-dark);
  margin-bottom: 30px;
}

.contact-links-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.contact-link-box {
  background-color: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-dark);
  border-radius: var(--border-radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: var(--transition-smooth);
}

.contact-link-box:hover {
  background-color: rgba(255, 255, 255, 0.05);
  transform: translateY(-2px);
}

.contact-link-box .link-icon {
  font-size: 1.8rem;
  margin-bottom: 10px;
}

.contact-link-box .link-title {
  font-weight: 600;
  color: var(--text-on-dark);
  font-size: 0.95rem;
  margin-bottom: 5px;
}

.contact-link-box .link-url {
  font-size: 0.8rem;
  color: var(--text-muted-dark);
  font-family: var(--font-mono);
  text-decoration: underline;
}

/* Footer structure */
.main-footer {
  text-align: center;
  padding: 40px 0;
  background-color: var(--bg-dark-block);
  color: var(--text-on-dark);
  border-top: 2px solid var(--border-dark);
}

.main-footer p {
  font-size: 0.9rem;
  color: var(--text-muted-dark);
  margin-bottom: 5px;
}

.academic-note {
  font-size: 0.8rem;
  color: var(--text-muted-dark);
  font-family: var(--font-mono);
  margin-top: 10px;
}

/* Active Nav Links styling */
.nav-links a.active {
  color: var(--accent) !important;
  text-decoration: underline !important;
}

.nav-links a:hover {
  color: var(--accent);
  text-decoration: underline;
}

/* Primary Small Button (Navbar Contact) */
.btn-primary-small {
  background-color: transparent;
  color: var(--accent);
  padding: 8px 18px;
  border-radius: var(--border-radius-md);
  font-weight: 600;
  display: inline-block;
  border: 2px solid var(--accent);
  transition: var(--transition-smooth);
  text-decoration: none !important;
}

.btn-primary-small:hover {
  background-color: var(--accent) !important;
  color: #000000 !important;
  text-decoration: none !important;
}

/* Project Category Filters */
.project-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 35px;
}

.filter-btn {
  background-color: transparent;
  color: var(--text-on-light);
  border: 2px solid var(--border-light);
  padding: 8px 20px;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.9rem;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  transition: var(--transition-smooth);
}

.filter-btn:hover {
  background-color: rgba(255, 255, 255, 0.03);
}

.filter-btn.active {
  background-color: var(--accent);
  color: var(--bg-main);
  border-color: var(--accent);
}

/* Responsive adjustments */
@media (max-width: 800px) {
  .hero-section h1 {
    font-size: 2.8rem;
  }
  .about-grid {
    grid-template-columns: 1fr;
  }
  .contact-links-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 600px) {
  .navbar-container {
    flex-direction: column;
    gap: 15px;
    padding: 15px;
  }
  .nav-links {
    gap: 15px;
    flex-wrap: wrap;
    justify-content: center;
  }
  .projects-grid {
    grid-template-columns: 1fr;
  }
}