/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
  /* Red Theme Colors */
  --primary-red: #dc2626;
  --primary-red-dark: #b91c1c;
  --primary-red-light: #ef4444;
  --accent-red: #f87171;
  --red-gradient: linear-gradient(135deg, #dc2626, #b91c1c);
  
  /* Neutral Colors */
  --dark-bg: #0f0f0f;
  --dark-secondary: #1a1a1a;
  --dark-tertiary: #2a2a2a;
  --text-primary: #ffffff;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  
  /* Spacing */
  --section-padding: 100px 0;
  --container-padding: 0 20px;
  --border-radius: 12px;
  --border-radius-lg: 20px;
  
  /* Typography */
  --font-primary: 'Inter', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --shadow-red: 0 10px 30px rgba(220, 38, 38, 0.3);
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ===== RESET & BASE STYLES ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  background-color: var(--dark-bg);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ===== UTILITY CLASSES ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--container-padding);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border: none;
  border-radius: var(--border-radius);
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: var(--red-gradient);
  color: white;
  box-shadow: var(--shadow-red);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 15px 35px rgba(220, 38, 38, 0.4);
}

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

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

/* ===== NAVIGATION ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(15, 15, 15, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 15px 0;
  transition: all var(--transition-normal);
}

.navbar.scrolled {
  background: rgba(15, 15, 15, 0.98);
  box-shadow: var(--shadow-lg);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--container-padding);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-logo .logo-text {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--primary-red);
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 30px;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-normal);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-red);
  transition: width var(--transition-normal);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  gap: 4px;
}

.hamburger .bar {
  width: 25px;
  height: 3px;
  background: var(--text-primary);
  transition: all var(--transition-normal);
}

/* ===== 3D CANVAS ===== */
#three-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

/* ===== HERO SECTION ===== */
.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: var(--section-padding);
}

.hero-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--container-padding);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}

.hero-text {
  z-index: 2;
}

.hero-title {
  margin-bottom: 30px;
}

.greeting {
  display: block;
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: 10px;
}

.name {
  display: block;
  font-size: var(--font-size-5xl);
  font-weight: 700;
  background: var(--red-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 10px;
}

.title {
  display: block;
  font-size: var(--font-size-2xl);
  color: var(--text-secondary);
  font-weight: 400;
}

.hero-description {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
  margin-bottom: 40px;
  line-height: 1.8;
}

.hero-buttons {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.hero-visual {
  position: relative;
  height: 400px;
}

.floating-elements {
  position: relative;
  width: 100%;
  height: 100%;
}

.floating-cube {
  position: absolute;
  width: 60px;
  height: 60px;
  background: var(--red-gradient);
  border-radius: var(--border-radius);
  animation: float 6s ease-in-out infinite;
  box-shadow: var(--shadow-red);
}

.cube-1 {
  top: 20%;
  left: 10%;
  animation-delay: 0s;
}

.cube-2 {
  top: 60%;
  right: 20%;
  animation-delay: 2s;
}

.cube-3 {
  bottom: 20%;
  left: 50%;
  animation-delay: 4s;
}

@keyframes float {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(180deg); }
}

.scroll-indicator {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-arrow {
  color: var(--primary-red);
  font-size: var(--font-size-xl);
}

@keyframes bounce {
  0%, 20%, 50%, 80%, 100% { transform: translateX(-50%) translateY(0); }
  40% { transform: translateX(-50%) translateY(-10px); }
  60% { transform: translateX(-50%) translateY(-5px); }
}

/* ===== SECTION STYLES ===== */
.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-title {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  margin-bottom: 20px;
  background: var(--red-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: var(--font-size-lg);
  color: var(--text-secondary);
}

/* ===== PROJECTS SECTION ===== */
.projects-section {
  padding: var(--section-padding);
  background: var(--dark-secondary);
}

.project-filters {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 50px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 10px 20px;
  background: transparent;
  border: 2px solid var(--dark-tertiary);
  color: var(--text-secondary);
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-normal);
}

.filter-btn:hover,
.filter-btn.active {
  border-color: var(--primary-red);
  color: var(--primary-red);
  background: rgba(220, 38, 38, 0.1);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
}

.project-card {
  background: var(--dark-tertiary);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  transition: all var(--transition-normal);
  cursor: pointer;
}

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

.project-image {
  height: 200px;
  background: var(--red-gradient);
  position: relative;
  overflow: hidden;
}

.project-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: all var(--transition-normal);
}

.project-card:hover .project-overlay {
  opacity: 1;
}

.project-links {
  display: flex;
  gap: 15px;
}

.project-link {
  width: 50px;
  height: 50px;
  background: var(--primary-red);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  text-decoration: none;
  transition: all var(--transition-normal);
}

.project-link:hover {
  background: var(--primary-red-light);
  transform: scale(1.1);
}

.project-content {
  padding: 25px;
}

.project-title {
  font-size: var(--font-size-xl);
  font-weight: 600;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.project-description {
  color: var(--text-secondary);
  margin-bottom: 20px;
  line-height: 1.6;
}

.project-tech {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.tech-tag {
  padding: 5px 12px;
  background: rgba(220, 38, 38, 0.1);
  color: var(--primary-red);
  border-radius: var(--border-radius);
  font-size: var(--font-size-sm);
  font-weight: 500;
}

/* ===== SKILLS SECTION ===== */
.skills-section {
  padding: var(--section-padding);
}

.skills-container {
  display: grid;
  gap: 50px;
}

.skill-category {
  background: var(--dark-secondary);
  padding: 40px;
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--dark-tertiary);
}

.category-title {
  font-size: var(--font-size-2xl);
  font-weight: 600;
  margin-bottom: 30px;
  color: var(--primary-red);
}

.skills-grid {
  display: grid;
  gap: 25px;
}

.skill-item {
  display: flex;
  align-items: center;
  gap: 20px;
}

.skill-icon {
  width: 50px;
  height: 50px;
  background: var(--red-gradient);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--font-size-xl);
  flex-shrink: 0;
}

.skill-info {
  flex: 1;
}

.skill-name {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.skill-bar {
  width: 100%;
  height: 8px;
  background: var(--dark-tertiary);
  border-radius: 4px;
  overflow: hidden;
}

.skill-progress {
  height: 100%;
  background: var(--red-gradient);
  border-radius: 4px;
  width: 0;
  transition: width 1s ease-out;
}

/* ===== CERTIFICATIONS SECTION ===== */
.certifications-section {
  padding: var(--section-padding);
  background: var(--dark-secondary);
}

.certifications-timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
}

.certifications-timeline::before {
  content: '';
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--primary-red);
  transform: translateX(-50%);
}

.timeline-item {
  position: relative;
  margin-bottom: 50px;
}

.timeline-item:nth-child(odd) .timeline-content {
  margin-right: 50%;
  padding-right: 30px;
}

.timeline-item:nth-child(even) .timeline-content {
  margin-left: 50%;
  padding-left: 30px;
}

.timeline-marker {
  position: absolute;
  left: 50%;
  top: 20px;
  width: 20px;
  height: 20px;
  background: var(--primary-red);
  border-radius: 50%;
  transform: translateX(-50%);
  z-index: 2;
}

.cert-card {
  background: var(--dark-tertiary);
  padding: 30px;
  border-radius: var(--border-radius-lg);
  display: flex;
  align-items: center;
  gap: 20px;
  transition: all var(--transition-normal);
}

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

.cert-icon {
  width: 60px;
  height: 60px;
  background: var(--red-gradient);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--font-size-2xl);
  flex-shrink: 0;
}

.cert-info {
  flex: 1;
}

.cert-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--text-primary);
}

.cert-issuer {
  color: var(--text-secondary);
  margin-bottom: 5px;
}

.cert-date {
  color: var(--text-muted);
  font-size: var(--font-size-sm);
  margin-bottom: 10px;
}

.cert-verify {
  color: var(--primary-red);
  text-decoration: none;
  font-weight: 500;
  font-size: var(--font-size-sm);
}

.cert-verify:hover {
  text-decoration: underline;
}

/* ===== CONTACT SECTION ===== */
.contact-section {
  padding: var(--section-padding);
}

.contact-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 30px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 20px;
}

.contact-icon {
  width: 50px;
  height: 50px;
  background: var(--red-gradient);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: var(--font-size-lg);
  flex-shrink: 0;
}

.contact-details h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: 5px;
  color: var(--text-primary);
}

.contact-details p {
  color: var(--text-secondary);
}

.social-links {
  display: flex;
  gap: 15px;
  margin-top: 20px;
}

.social-link {
  width: 50px;
  height: 50px;
  background: var(--dark-tertiary);
  border-radius: var(--border-radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all var(--transition-normal);
}

.social-link:hover {
  background: var(--primary-red);
  color: white;
  transform: translateY(-3px);
}

.contact-form {
  background: var(--dark-secondary);
  padding: 40px;
  border-radius: var(--border-radius-lg);
  border: 1px solid var(--dark-tertiary);
}

.form-group {
  position: relative;
  margin-bottom: 30px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 15px;
  background: var(--dark-tertiary);
  border: 2px solid transparent;
  border-radius: var(--border-radius);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-normal);
}

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

.form-group label {
  position: absolute;
  top: 15px;
  left: 15px;
  color: var(--text-muted);
  transition: all var(--transition-normal);
  pointer-events: none;
}

.form-group input:focus + label,
.form-group input:valid + label,
.form-group textarea:focus + label,
.form-group textarea:valid + label {
  top: -10px;
  left: 10px;
  font-size: var(--font-size-sm);
  color: var(--primary-red);
  background: var(--dark-secondary);
  padding: 0 5px;
}

/* ===== FOOTER ===== */
.footer {
  background: var(--dark-secondary);
  padding: 40px 0;
  border-top: 1px solid var(--dark-tertiary);
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

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

.footer-links {
  display: flex;
  gap: 30px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-normal);
}

.footer-links a:hover {
  color: var(--primary-red);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }
  
  .nav-menu {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background: rgba(15, 15, 15, 0.98);
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding-top: 50px;
    transition: left var(--transition-normal);
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 40px;
  }
  
  .name {
    font-size: var(--font-size-4xl);
  }
  
  .hero-buttons {
    justify-content: center;
  }
  
  .contact-content {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .timeline-item:nth-child(odd) .timeline-content,
  .timeline-item:nth-child(even) .timeline-content {
    margin: 0;
    padding: 0 0 0 40px;
  }
  
  .certifications-timeline::before {
    left: 20px;
  }
  
  .timeline-marker {
    left: 20px;
  }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }
  
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .btn {
    width: 100%;
    max-width: 250px;
    justify-content: center;
  }
}

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

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.animate-on-scroll {
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

/* ===== SCROLLBAR STYLING ===== */
::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--dark-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--primary-red);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-red-light);
}