/* Default Theme (Professional Modern) */
:root {
  /* Colors */
  --primary-color: #2563eb;
  --primary-hover: #1d4ed8;
  --secondary-color: #0f172a;
  --accent-color: #7e22ce;
  --background-color: #ffffff;
  --card-background: #ffffff;
  --text-color: #334155;
  --text-light: #64748b;
  --border-color: #e2e8f0;
  --shadow-color: rgba(0, 0, 0, 0.08);
  --shadow-hover: rgba(0, 0, 0, 0.15);
  
  /* Typography */
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xxs: 0.25rem;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
  
  /* Border Radius */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-radius-xl: 16px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --transition-slow: 500ms ease;
  
  /* Sizes */
  --max-width: 1200px;
  --nav-height: 70px;
}

/* Dark Theme */
[data-theme="dark"] {
  /* Colors */
  --primary-color: #3b82f6;
  --primary-hover: #2563eb;
  --secondary-color: #f1f5f9;
  --accent-color: #a855f7;
  --background-color: #0f172a;
  --card-background: #1e293b;
  --text-color: #e2e8f0;
  --text-light: #94a3b8;
  --border-color: #334155;
  --shadow-color: rgba(0, 0, 0, 0.25);
  --shadow-hover: rgba(0, 0, 0, 0.4);
}

/* Minimal Theme */
[data-theme="minimal"] {
  /* Colors */
  --primary-color: #000000;
  --primary-hover: #333333;
  --secondary-color: #000000;
  --accent-color: #000000;
  --background-color: #ffffff;
  --card-background: #ffffff;
  --text-color: #000000;
  --text-light: #555555;
  --border-color: #eaeaea;
  --shadow-color: rgba(0, 0, 0, 0.05);
  --shadow-hover: rgba(0, 0, 0, 0.1);
}

/* Vibrant Theme */
[data-theme="vibrant"] {
  /* Colors */
  --primary-color: #ff6b35;
  --primary-hover: #e55a2b;
  --secondary-color: #2c3e50;
  --accent-color: #f7931e;
  --background-color: #f8f9fa;
  --card-background: #ffffff;
  --text-color: #2c3e50;
  --text-light: #7f8c8d;
  --border-color: #e9ecef;
  --shadow-color: rgba(247, 147, 30, 0.1);
  --shadow-hover: rgba(247, 147, 30, 0.2);
}

/* Apply theme variables to elements */
body {
  background-color: var(--background-color);
  color: var(--text-color);
  font-family: var(--font-main);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  transition: var(--transition-normal);
  overflow-x: hidden;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

/* Header and Navigation */
header {
  background-color: var(--card-background);
  box-shadow: 0 1px 3px var(--shadow-color);
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width);
  width: 100%;
  padding: 0 var(--spacing-sm);
  margin: 0 auto;
}

.nav-brand h1 {
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  color: var(--primary-color);
  letter-spacing: -0.5px;
  white-space: nowrap;
}

.nav-menu {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  align-items: center;
  flex-wrap: nowrap;
}

.nav-item {
  margin-left: var(--spacing-md);
  flex-shrink: 0;
}

.nav-link {
  text-decoration: none;
  color: var(--text-color);
  font-weight: var(--font-weight-medium);
  font-size: 0.95rem;
  transition: var(--transition-fast);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  position: relative;
  white-space: nowrap;
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: var(--spacing-sm);
  right: var(--spacing-sm);
  height: 2px;
  background-color: var(--primary-color);
  border-radius: 2px;
}

/* Theme selector styles */
.theme-selector {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-left: var(--spacing-lg);
  margin-right: var(--spacing-md);
  padding-right: var(--spacing-xs);
}

.theme-selector label {
  font-weight: var(--font-weight-medium);
  color: var(--text-color);
  font-size: 0.8rem;
}

.theme-selector select {
  padding: 0.25rem 0.5rem;
  border-radius: var(--border-radius-sm);
  border: 1px solid var(--border-color);
  background-color: var(--card-background);
  color: var(--text-color);
  font-family: var(--font-main);
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition-fast);
  width: auto;
  min-width: 100px;
}

.theme-selector select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 30px;
  height: 21px;
  cursor: pointer;
  z-index: 101;
}

.menu-toggle span {
  display: block;
  height: 3px;
  width: 100%;
  background-color: var(--text-color);
  border-radius: 2px;
  transition: var(--transition-fast);
}

/* Mobile Navigation */
.mobile-nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: var(--card-background);
  z-index: 100;
  display: flex;
  flex-direction: column;
  padding: var(--spacing-lg);
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  overflow-y: auto;
}

.mobile-nav.active {
  transform: translateX(0);
}

.nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--border-color);
  margin-bottom: var(--spacing-lg);
}

.nav-header h2 {
  color: var(--primary-color);
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
}

.close-menu {
  width: 30px;
  height: 30px;
  position: relative;
  cursor: pointer;
}

.close-menu span {
  position: absolute;
  top: 50%;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--text-color);
  border-radius: 2px;
  transform-origin: center;
}

.close-menu span:first-child {
  transform: translateY(-50%) rotate(45deg);
}

.close-menu span:last-child {
  transform: translateY(-50%) rotate(-45deg);
}

.mobile-nav .nav-menu {
  flex-direction: column;
  align-items: flex-start;
}

.mobile-nav .nav-item {
  margin: 0 0 var(--spacing-md) 0;
  width: 100%;
}

.mobile-nav .nav-link {
  display: block;
  padding: var(--spacing-sm);
  font-size: 1.1rem;
  border-radius: var(--border-radius-md);
  width: 100%;
}

.mobile-nav .nav-link:hover,
.mobile-nav .nav-link.active {
  background-color: rgba(37, 99, 235, 0.1);
}

.mobile-nav .nav-link.active::after {
  display: none;
}

/* Mobile Theme Selector */
.theme-selector-mobile {
  margin-top: auto;
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--border-color);
}

.theme-selector-mobile label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: var(--font-weight-medium);
  color: var(--text-color);
}

.theme-selector-mobile select {
  width: 100%;
  padding: 0.8rem;
  border-radius: var(--border-radius-md);
  border: 1px solid var(--border-color);
  background-color: var(--card-background);
  color: var(--text-color);
  font-family: var(--font-main);
  font-size: 1rem;
}

/* Main content */
.main-content {
  min-height: calc(100vh - var(--nav-height) - 100px);
  padding: var(--spacing-lg) 0;
}

/* Sections */
.section {
  display: none;
  animation: fadeIn 0.5s ease;
}

.section.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Hero section */
.hero {
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  color: white;
  padding: var(--spacing-xl) 0;
  text-align: center;
  border-radius: 0 0 var(--border-radius-lg) var(--border-radius-lg);
  margin-bottom: var(--spacing-lg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at top right, rgba(255,255,255,0.2) 0%, transparent 40%),
              radial-gradient(circle at bottom left, rgba(255,255,255,0.1) 0%, transparent 40%);
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-sm);
}

.hero-content h1 {
  font-size: 2.5rem;
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
  line-height: 1.2;
  letter-spacing: -0.5px;
}

.hero-content h2 {
  font-size: 1.5rem;
  font-weight: var(--font-weight-semibold);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.25px;
}

.hero-content p {
  font-size: 1.2rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.9;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-outline {
  display: inline-block;
  padding: 0.8rem 1.75rem;
  border-radius: var(--border-radius-md);
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  font-size: 1rem;
  transition: var(--transition-fast);
  border: none;
  cursor: pointer;
  text-align: center;
  line-height: 1.2;
}

.btn-primary {
  background-color: white;
  color: var(--primary-color);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
  background-color: #f8f8f8;
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.btn-secondary {
  background-color: var(--secondary-color);
  color: white;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-secondary:hover {
  opacity: 0.9;
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

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

.btn-outline:hover {
  background-color: var(--primary-color);
  color: white;
  transform: translateY(-2px);
}

/* Section titles */
.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  position: relative;
}

.section-title h1 {
  font-size: 2.25rem;
  font-weight: var(--font-weight-bold);
  color: var(--secondary-color);
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.5px;
}

.section-title h2 {
  font-size: 1.5rem;
  font-weight: var(--font-weight-semibold);
  color: var(--primary-color);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.25px;
}

.section-title p {
  font-size: 1.1rem;
  color: var(--text-light);
  max-width: 600px;
  margin: 0 auto;
}

/* Cards and containers */
.card,
.skill-category,
.project-card,
.contact-info {
  background-color: var(--card-background);
  border-radius: var(--border-radius-lg);
  transition: var(--transition-normal);
  border: 1px solid var(--border-color);
}

.card:hover,
.project-card:hover {
  transform: translateY(-5px);
}

/* About section */
.about-section {
  padding: var(--spacing-lg) 0;
}

.about-content {
  display: flex;
  gap: var(--spacing-xl);
  align-items: flex-start;
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
}

.about-text {
  flex: 1;
  min-width: 300px;
}

.about-text h2 {
  font-size: 1.8rem;
  font-weight: var(--font-weight-bold);
  color: var(--secondary-color);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.3px;
}

.about-text p {
  margin-bottom: var(--spacing-md);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text-light);
}

.about-image {
  flex: 0 0 300px;
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-sm);
}

.profile-placeholder {
  width: 350px;
  height: 350px;
  background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: white;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  position: relative;
  overflow: hidden;
}

.profile-placeholder::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.2) 0%, transparent 70%);
  transform: rotate(30deg);
}

/* Profile Photo */
.profile-photo {
  width: 300px;
  height: 300px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center;
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
  border: 5px solid white;
  margin: 0 auto;
}

/* Skills/Tech Stack section */
.skills-section {
  padding: var(--spacing-lg) 0;
}

.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.skill-category {
  padding: var(--spacing-lg);
}

.skill-category h2 {
  margin-bottom: var(--spacing-md);
  color: var(--secondary-color);
  font-size: 1.5rem;
  font-weight: var(--font-weight-semibold);
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--primary-color);
}

.skill-item {
  margin-bottom: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  transition: var(--transition-fast);
}

.skill-item:hover {
  background-color: rgba(37, 99, 235, 0.05);
  transform: translateX(5px);
}

.skill-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: 0.5rem 0;
}

.skill-logo {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background-color: rgba(248, 250, 252, 0.8);
  border-radius: 6px;
  padding: 3px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.skill-logo i {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.skill-logo svg {
  width: 100%;
  height: 100%;
  display: block;
}

.skill-item h3 {
  margin: 0;
  color: var(--text-color);
  font-weight: var(--font-weight-medium);
  font-size: 1.1rem;
  line-height: 1.4;
}

/* Projects section */
.projects-section {
  padding: var(--spacing-lg) 0;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: var(--spacing-lg);
}

.project-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  background-color: var(--card-background);
  border-radius: var(--border-radius-lg);
  transition: var(--transition-normal);
  border: 1px solid var(--border-color);
  box-shadow: 0 4px 6px var(--shadow-color);
}

.project-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px var(--shadow-hover);
}

.project-info {
  padding: var(--spacing-lg);
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.project-info h3 {
  margin-bottom: var(--spacing-sm);
  color: var(--secondary-color);
  font-size: 1.5rem;
  font-weight: var(--font-weight-bold);
  letter-spacing: -0.3px;
}

.project-info p {
  margin-bottom: var(--spacing-md);
  color: var(--text-light);
  flex-grow: 1;
  line-height: 1.7;
  font-size: 1.05rem;
}

.project-tags {
  margin-bottom: var(--spacing-md);
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tag {
  display: inline-block;
  background-color: rgba(37, 99, 235, 0.1);
  color: var(--primary-color);
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: var(--font-weight-medium);
  transition: var(--transition-fast);
}

.tag:hover {
  background-color: rgba(37, 99, 235, 0.2);
  transform: translateY(-2px);
}

.project-links {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: auto;
}

.project-links .btn-outline {
  flex: 1;
  text-align: center;
  padding: 0.7rem 1.2rem;
  font-size: 0.95rem;
  font-weight: var(--font-weight-semibold);
}

/* Contact section */
.contact-section {
  padding: var(--spacing-lg) 0;
}

.contact-info {
  padding: var(--spacing-lg);
  max-width: 800px;
  margin: 0 auto;
}

.contact-info h2 {
  margin-bottom: var(--spacing-md);
  color: var(--secondary-color);
  font-size: 1.5rem;
  font-weight: var(--font-weight-semibold);
}

.contact-info p {
  margin-bottom: var(--spacing-lg);
  color: var(--text-light);
  font-size: 1.05rem;
  line-height: 1.7;
}

.contact-item {
  margin-bottom: var(--spacing-lg);
}

.contact-item h3 {
  color: var(--primary-color);
  margin-bottom: var(--spacing-xs);
  font-size: 1.1rem;
  font-weight: var(--font-weight-semibold);
}

.contact-item p {
  font-size: 1.05rem;
  color: var(--text-color);
}

.social-links {
  margin-top: var(--spacing-lg);
}

.social-links h3 {
  color: var(--secondary-color);
  margin-bottom: var(--spacing-md);
  font-size: 1.1rem;
  font-weight: var(--font-weight-semibold);
}

.social-icons {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xs);
}

.social-icon {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  background-color: var(--primary-color);
  color: white;
  text-decoration: none;
  border-radius: var(--border-radius-md);
  transition: var(--transition-fast);
  font-weight: var(--font-weight-medium);
  font-size: 0.9rem;
}

.social-icon:hover {
  background-color: var(--primary-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Certificates section */
.certificates-section {
  padding: var(--spacing-lg) 0;
}

.certificates-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.certificate-category {
  padding: var(--spacing-lg);
}

.certificate-category h2 {
  margin-bottom: var(--spacing-md);
  color: var(--secondary-color);
  font-size: 1.5rem;
  font-weight: var(--font-weight-semibold);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--primary-color);
}

.certificate-item {
  margin-bottom: var(--spacing-sm);
  padding: var(--spacing-sm);
  border-radius: var(--border-radius-md);
  transition: var(--transition-fast);
  border: 1px solid var(--border-color);
}

.certificate-item:hover {
  background-color: rgba(37, 99, 235, 0.05);
  transform: translateX(5px);
}

.certificate-content {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
}

.certificate-logo {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background-color: rgba(248, 250, 252, 0.8);
  border-radius: 6px;
  padding: 5px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.certificate-logo i {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.certificate-info {
  flex: 1;
}

.certificate-info h3 {
  margin: 0 0 0.5rem 0;
  color: var(--text-color);
  font-weight: var(--font-weight-semibold);
  font-size: 1.1rem;
  line-height: 1.4;
}

.certificate-info .issuer {
  margin: 0 0 0.25rem 0;
  color: var(--primary-color);
  font-weight: var(--font-weight-medium);
  font-size: 0.95rem;
}

.certificate-info .date {
  margin: 0 0 0.5rem 0;
  color: var(--text-light);
  font-size: 0.9rem;
  font-style: italic;
}

.certificate-info .description {
  margin: 0;
  color: var(--text-light);
  font-size: 0.95rem;
  line-height: 1.5;
}

/* Certificate display */
.certificate-display {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-sm) 0;
}

.certificate-header {
  text-align: center;
  max-width: 600px;
}

.certificate-header h2 {
  color: var(--secondary-color);
  font-size: 1.5rem;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
}

.certificate-description {
  color: var(--text-light);
  font-size: 1.05rem;
  line-height: 1.6;
  margin: 0;
}

.certificate-image-container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-sm) 0;
}

.certificate-image-wrapper {
  max-width: 80%;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-sm);
  background-color: var(--card-background);
  box-shadow: 0 4px 6px var(--shadow-color);
}

.certificate-image {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--border-radius-sm);
  max-height: 400px;
  object-fit: contain;
}

/* Footer */
footer {
  background-color: var(--secondary-color);
  color: white;
  text-align: center;
  padding: var(--spacing-sm) 0;
  margin-top: var(--spacing-lg);
}

footer p {
  font-size: 0.95rem;
  opacity: 0.8;
}

/* Preview grid for homepage */
.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.preview-card {
  background-color: var(--card-background);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 4px 6px var(--shadow-color);
  padding: var(--spacing-lg);
  transition: var(--transition-normal);
  border: 1px solid var(--border-color);
}

.preview-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px var(--shadow-hover);
}

.preview-card h3 {
  font-size: 1.5rem;
  font-weight: var(--font-weight-semibold);
  margin-bottom: var(--spacing-sm);
  color: var(--secondary-color);
}

.preview-card p {
  color: var(--text-light);
  margin-bottom: var(--spacing-md);
  font-size: 1.05rem;
  line-height: 1.6;
}

/* Responsive design */
@media (max-width: 992px) {
  .hero-content h1 {
    font-size: 2.2rem;
  }
  
  .section-title h1 {
    font-size: 2rem;
  }
  
  .skills-container,
  .projects-grid {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
}

@media (max-width: 768px) {
  .menu-toggle {
    display: flex;
  }
  
  .navbar .nav-menu,
  .theme-selector {
    display: none;
  }
  
  .navbar {
    padding: 0 var(--spacing-sm);
  }
  
  .hero {
    padding: var(--spacing-lg) 0;
  }
  
  .hero-content h1 {
    font-size: 1.8rem;
  }
  
  .hero-content p {
    font-size: 1.1rem;
  }
  
  .about-content {
    flex-direction: column;
  }
  
  .profile-placeholder {
    width: 250px;
    height: 250px;
  }
  
  .project-links {
    flex-direction: column;
  }
  
  .skills-container,
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .preview-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-xs);
  }
  
  .hero {
    padding: var(--spacing-md) 0;
  }
  
  .hero-content h1 {
    font-size: 1.6rem;
  }
  
  .hero-content p {
    font-size: 1rem;
  }
  
  .section-title h1 {
    font-size: 1.75rem;
  }
  
  .btn-primary,
  .btn-secondary,
  .btn-outline {
    padding: 0.7rem 1.5rem;
    font-size: 0.95rem;
  }
}