/* CSS Variables */
:root {
  --primary-color: #374151;
  --primary-dark: #1f2937;
  --primary-light: #4b5563;
  --secondary-color: #6b7280;
  --accent-color: #9ca3af;
  --text-primary: #111827;
  --text-secondary: #374151;
  --text-light: #6b7280;
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: linear-gradient(135deg, #f9fafb 0%, #e5e7eb 100%);
  background-attachment: fixed;
  color: var(--text-primary);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

/* Header & Navigation */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

nav {
  display: flex;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-lg);
  align-items: center;
  justify-content: center;
}

.header_list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  gap: var(--spacing-xl);
  justify-content: center;
  flex-wrap: wrap;
}

.header_list li {
  margin: 0;
}

.header_list li a {
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: clamp(14px, 1.2vw, 16px);
  transition: var(--transition);
  position: relative;
  padding: var(--spacing-xs) 0;
}

.header_list li a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: var(--transition);
}

.header_list li a:hover {
  color: var(--primary-color);
}

.header_list li a:hover::after {
  width: 100%;
}

/* Front Page / Hero Section */
.front_page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
  position: relative;
  background: linear-gradient(135deg, rgba(55, 65, 81, 0.05) 0%, rgba(107, 114, 128, 0.05) 100%);
}

.front_content {
  text-align: center;
  max-width: 800px;
  animation: fadeInUp 0.8s ease-out;
}

.hero_name {
  font-size: clamp(3rem, 8vw, 5rem);
  font-weight: 800;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 50%, var(--secondary-color) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.hero_tagline {
  font-size: clamp(1.25rem, 3vw, 2rem);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.hero_description {
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--spacing-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  color: var(--bg-primary);
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
  padding: var(--spacing-md) var(--spacing-xl);
  text-decoration: none;
  font-weight: 600;
  font-size: clamp(14px, 1.2vw, 18px);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  border: none;
  cursor: pointer;
}

.button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-xl);
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-color) 100%);
}

.button i {
  font-size: 1.2em;
}

.front_contact {
  position: fixed;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: var(--spacing-md);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(10px);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: 50px;
  box-shadow: var(--shadow-lg);
  z-index: 100;
}

.front_contact a {
  color: var(--text-primary);
  font-size: 24px;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
}

.front_contact a:hover {
  color: var(--primary-color);
  background: rgba(55, 65, 81, 0.1);
  transform: scale(1.1);
}

/* Projects Section */
.projects_page {
  padding: var(--spacing-2xl) var(--spacing-lg);
  max-width: 1400px;
  margin: 0 auto;
  min-height: 100vh;
}

.projects_header,
.skills_header {
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: 800;
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  color: var(--text-primary);
  position: relative;
  padding-bottom: var(--spacing-md);
}

.projects_header::after,
.skills_header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--primary-dark) 100%);
  border-radius: 2px;
}

.projects_content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.project {
  background: var(--bg-primary);
  border-radius: 16px;
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.project::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--primary-dark) 100%);
  transform: scaleX(0);
  transition: var(--transition);
}

.project:hover::before {
  transform: scaleX(1);
}

.project:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.project_status {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.project_status.in-progress {
  background: rgba(107, 114, 128, 0.15);
  color: var(--secondary-color);
}

.project_badge {
  position: absolute;
  top: var(--spacing-md);
  right: var(--spacing-md);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  background: rgba(107, 114, 128, 0.15);
  color: var(--secondary-color);
}

.project h2 {
  font-size: clamp(1.5rem, 2vw, 1.75rem);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
  margin-top: var(--spacing-md);
}

.project p {
  font-size: clamp(0.95rem, 1.2vw, 1.1rem);
  color: var(--text-secondary);
  line-height: 1.7;
  flex-grow: 1;
  margin-bottom: var(--spacing-md);
}

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

.tag {
  display: inline-block;
  padding: var(--spacing-xs) var(--spacing-md);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.tag:hover {
  background: rgba(55, 65, 81, 0.1);
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.project_link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  margin-top: auto;
  font-weight: 600;
  color: var(--primary-color);
  text-decoration: none;
  font-size: 0.95rem;
  transition: var(--transition);
  padding: var(--spacing-xs) 0;
}

.project_link:hover {
  color: var(--primary-dark);
  gap: var(--spacing-sm);
}

.project_link i {
  font-size: 1.1em;
}

/* Skills Section */
.skills_page {
  padding: var(--spacing-2xl) var(--spacing-lg);
  max-width: 1400px;
  margin: 0 auto;
  min-height: 100vh;
}

.skills_content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}

.skill {
  background: var(--bg-primary);
  border-radius: 16px;
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  border: 1px solid var(--border-color);
  position: relative;
  overflow: hidden;
}

.skill::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 50%, var(--primary-dark) 100%);
}

.skill:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

.skill img {
  width: 70px;
  height: 70px;
  margin-bottom: var(--spacing-md);
  transition: var(--transition);
  filter: drop-shadow(var(--shadow-sm));
}

.skill:hover img {
  transform: scale(1.1);
}

.skill h2 {
  font-size: clamp(1.25rem, 1.5vw, 1.5rem);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.skill ul {
  list-style: none;
  padding: 0;
  margin: 0;
  width: 100%;
}

.skill ul li {
  margin: var(--spacing-sm) 0;
  font-size: clamp(0.9rem, 1.1vw, 1rem);
  color: var(--text-secondary);
  padding: var(--spacing-xs) 0;
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

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

.skill ul li:hover {
  color: var(--primary-color);
  padding-left: var(--spacing-xs);
}

/* Contact Section */
.contact_page {
  padding: var(--spacing-2xl) var(--spacing-lg);
  min-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.contact_content {
  text-align: center;
  background: var(--bg-primary);
  padding: var(--spacing-2xl);
  border-radius: 20px;
  box-shadow: var(--shadow-xl);
  max-width: 600px;
  width: 100%;
  border: 1px solid var(--border-color);
}

.contact_content h1 {
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.contact_content > p {
  font-size: clamp(1rem, 1.2vw, 1.1rem);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-lg);
}

.contact_email {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  font-size: clamp(1rem, 1.2vw, 1.2rem);
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  margin-bottom: var(--spacing-xl);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: 12px;
  background: rgba(55, 65, 81, 0.05);
  transition: var(--transition);
}

.contact_email:hover {
  background: rgba(55, 65, 81, 0.1);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.contact_email i {
  font-size: 1.2em;
}

.contact_socials {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  margin-top: var(--spacing-lg);
}

.contact_socials a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--bg-tertiary);
  color: var(--text-primary);
  font-size: 24px;
  transition: var(--transition);
  text-decoration: none;
}

.contact_socials a:hover {
  background: var(--primary-color);
  color: var(--bg-primary);
  transform: translateY(-4px) scale(1.1);
  box-shadow: var(--shadow-lg);
}

/* Footer */
.footer {
  background: var(--text-primary);
  color: var(--bg-primary);
  text-align: center;
  padding: var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer p {
  font-size: 0.9rem;
  opacity: 0.9;
}

/* Animations */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .header_list {
    gap: var(--spacing-md);
  }

  .front_page {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .front_contact {
    position: relative;
    bottom: auto;
    left: auto;
    transform: none;
    margin-top: var(--spacing-xl);
    border-radius: 16px;
  }

  .projects_content,
  .skills_content {
    grid-template-columns: 1fr;
    gap: var(--spacing-lg);
  }

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

  .contact_content {
    padding: var(--spacing-xl);
  }

  .contact_socials {
    gap: var(--spacing-md);
  }

  .contact_socials a {
    width: 45px;
    height: 45px;
    font-size: 20px;
  }
}

@media (max-width: 480px) {
  nav {
    padding: var(--spacing-sm) var(--spacing-md);
  }

  .header_list {
    gap: var(--spacing-sm);
  }

  .header_list li a {
    font-size: 14px;
  }

  .projects_page,
  .skills_page,
  .contact_page {
    padding: var(--spacing-xl) var(--spacing-md);
  }

  .button {
    padding: var(--spacing-sm) var(--spacing-lg);
  }
}

/* Print Styles */
@media print {
  .header,
  .front_contact,
  .footer {
    display: none;
  }

  .front_page {
    min-height: auto;
    page-break-after: always;
  }
}