/* Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family-sans);
  line-height: var(--line-height-normal);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

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

/* Container */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--space-2);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-2);
  color: var(--text-primary);
}

p {
  margin-bottom: var(--space-2);
  color: var(--text-secondary);
}

a {
  color: var(--color-primary-500);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-700);
}

/* Common Classes */
.section-padding {
  padding: var(--space-6) 0;
}

.section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-4);
  text-align: center;
}

.alternate-bg {
  background-color: var(--bg-secondary);
}

/* Button Styles */
.button {
  display: inline-block;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--border-radius-full);
  font-weight: var(--font-weight-medium);
  text-align: center;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  outline: none;
  font-size: var(--font-size-md);
}

.button-primary {
  background-color: var(--color-primary-500);
  color: var(--color-white);
}

.button-primary:hover {
  background-color: var(--color-primary-600);
  color: var(--color-white);
}

.button-secondary {
  background-color: transparent;
  color: var(--color-primary-500);
  border: 1px solid var(--color-primary-500);
}

.button-secondary:hover {
  background-color: var(--color-primary-100);
  color: var(--color-primary-700);
  border-color: var(--color-primary-700);
}

/* Header & Navigation */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background-color: rgba(var(--bg-primary), 0.9);
  backdrop-filter: blur(10px);
  z-index: var(--z-index-fixed);
  border-bottom: 1px solid var(--border-color);
  transition: all var(--transition-normal);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 100%;
}

.logo {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary-500);
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-full);
  background-color: var(--bg-secondary);
}

.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  list-style: none;
  margin-right: var(--space-2);
}

.nav-link {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link:hover {
  color: var(--color-primary-500);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--color-primary-500);
  transition: all var(--transition-fast);
  transform: translateX(-50%);
}

.nav-link:hover::after {
  width: 80%;
}

.theme-toggle, .mobile-menu-toggle {
  background: none;
  border: none;
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius-md);
  transition: background-color var(--transition-fast);
}

.theme-toggle:hover, .mobile-menu-toggle:hover {
  background-color: var(--bg-secondary);
}

.theme-toggle-icon {
  display: inline-block;
  width: 24px;
  height: 24px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='currentColor'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M12 3v1m0 16v1m9-9h-1M4 12H3m15.364 6.364l-.707-.707M6.343 6.343l-.707-.707m12.728 0l-.707.707M6.343 17.657l-.707.707M16 12a4 4 0 11-8 0 4 4 0 018 0z'%3E%3C/path%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
  filter: invert(50%);
}

.dark-theme .theme-toggle-icon {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='currentColor'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M20.354 15.354A9 9 0 018.646 3.646 9.003 9.003 0 0012 21a9.003 9.003 0 008.354-5.646z'%3E%3C/path%3E%3C/svg%3E");
}

.mobile-menu-toggle {
  display: none;
}

.mobile-menu-icon {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  position: relative;
  transition: background-color var(--transition-fast);
}

.mobile-menu-icon::before,
.mobile-menu-icon::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: transform var(--transition-fast);
}

.mobile-menu-icon::before {
  top: -8px;
}

.mobile-menu-icon::after {
  bottom: -8px;
}

.mobile-menu-active .mobile-menu-icon {
  background-color: transparent;
}

.mobile-menu-active .mobile-menu-icon::before {
  transform: rotate(45deg);
  top: 0;
}

.mobile-menu-active .mobile-menu-icon::after {
  transform: rotate(-45deg);
  bottom: 0;
}

/* Hero Section */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
  padding-bottom: var(--space-6);
}

.hero .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.hero-content {
  flex: 1;
  padding-right: var(--space-4);
}

.hero-title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--space-1);
  line-height: 1.1;
}

.hero-subtitle {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  margin-bottom: var(--space-3);
}

.hero-actions {
  display: flex;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.hero-image {
  flex: 1;
  display: flex;
  justify-content: flex-end;
}

.profile-image-container {
  width: 320px;
  height: 320px;
  border-radius: var(--border-radius-full);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 4px solid var(--color-white);
}

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

/* About Section */
.about-content {
  display: flex;
  gap: var(--space-6);
  margin-top: var(--space-4);
}

.about-text {
  flex: 2;
}

.about-text p {
  margin-bottom: var(--space-2);
  font-size: var(--font-size-lg);
}

.skills {
  flex: 1;
}

.skills-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2);
}

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

.skill-item {
  padding: var(--space-1) 0;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}

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

/* Experience Section */
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding: var(--space-4) 0;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  left: 20px;
  width: 2px;
  background-color: var(--color-primary-300);
}

.timeline-item {
  position: relative;
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}

.timeline-marker {
  position: absolute;
  left: 0;
  width: 40px;
  height: 40px;
  background-color: var(--color-primary-500);
  border-radius: var(--border-radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  z-index: 2;
}

.timeline-marker::before {
  content: '';
  display: block;
  width: 24px;
  height: 24px;
  background-color: var(--color-white);
  border-radius: var(--border-radius-full);
}

.timeline-content {
  background-color: var(--bg-primary);
  padding: var(--space-3);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
}

.timeline-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-1);
}

.timeline-place {
  font-size: var(--font-size-sm);
  color: var(--text-tertiary);
  margin-bottom: var(--space-2);
}

.timeline-description {
  color: var(--text-secondary);
}

/* Projects Section */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.project-card {
  background-color: var(--bg-primary);
  border-radius: var(--border-radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.project-image {
  height: 200px;
  overflow: hidden;
}

.project-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-normal);
}

.project-card:hover .project-img {
  transform: scale(1.05);
}

.project-content {
  padding: var(--space-3);
}

.project-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-1);
}

.project-description {
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
  font-size: var(--font-size-md);
}

.project-link {
  display: inline-block;
  color: var(--color-primary-500);
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.project-link:hover {
  color: var(--color-primary-700);
}

/* Contact Section */
.contact-content {
  display: flex;
  gap: var(--space-6);
  margin-top: var(--space-4);
}

.contact-info, .contact-form-container {
  flex: 1;
}

.contact-info p {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-3);
}

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

.contact-item {
  display: flex;
  align-items: center;
  margin-bottom: var(--space-2);
}

.contact-icon {
  margin-right: var(--space-1);
  font-size: var(--font-size-xl);
}

.contact-link {
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.contact-link:hover {
  color: var(--color-primary-500);
}

.contact-form {
  background-color: var(--bg-primary);
  padding: var(--space-3);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
}

.form-group {
  margin-bottom: var(--space-2);
}

.form-group label {
  display: block;
  margin-bottom: var(--space-1);
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-family-sans);
  font-size: var(--font-size-md);
  transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary-500);
}

/* Footer */
.footer {
  background-color: var(--bg-secondary);
  padding: var(--space-4) 0;
  border-top: 1px solid var(--border-color);
}

.footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.copyright {
  color: var(--text-tertiary);
  margin-bottom: 0;
}

.social-links {
  display: flex;
  list-style: none;
  gap: var(--space-2);
}

.social-link {
  color: var(--text-tertiary);
  transition: color var(--transition-fast);
}

.social-link:hover {
  color: var(--color-primary-500);
}

/* Responsive Styles */
@media (max-width: 992px) {
  .hero .container {
    flex-direction: column;
    text-align: center;
  }
  
  .hero-content {
    padding-right: 0;
    margin-bottom: var(--space-4);
  }
  
  .hero-actions {
    justify-content: center;
  }
  
  .about-content,
  .contact-content {
    flex-direction: column;
  }
  
  .about-text, .skills,
  .contact-info, .contact-form-container {
    flex: auto;
  }
  
  .skills, .contact-form-container {
    margin-top: var(--space-4);
  }
}

@media (max-width: 768px) {
  .nav-list {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--space-2) 0;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: var(--z-index-dropdown);
  }
  
  .nav-list.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }
  
  .nav-list li {
    width: 100%;
    text-align: center;
  }
  
  .nav-link {
    display: block;
    padding: var(--space-2);
  }
  
  .mobile-menu-toggle {
    display: flex;
  }
  
  .hero-title {
    font-size: var(--font-size-4xl);
  }
  
  .hero-subtitle {
    font-size: var(--font-size-lg);
  }
  
  .profile-image-container {
    width: 240px;
    height: 240px;
  }
  
  .section-title {
    font-size: var(--font-size-2xl);
  }
  
  .projects-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: var(--font-size-3xl);
  }
  
  .profile-image-container {
    width: 200px;
    height: 200px;
  }
  
  .hero-actions {
    flex-direction: column;
    gap: var(--space-2);
  }
  
  .footer .container {
    flex-direction: column;
    gap: var(--space-2);
  }
}