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

:root {
  /* Colors */
  --color-bg: #0a0a0a;
  --color-bg-secondary: #111111;
  --color-bg-card: #151515;
  --color-text: #e5e5e5;
  --color-text-muted: #a0a0a0;
  --color-accent: #3b82f6;
  --color-accent-hover: #2563eb;
  --color-border: #2a2a2a;
  --color-border-light: #1f1f1f;
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 4rem;
  --spacing-xl: 6rem;
  
  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 2rem;
  --font-size-3xl: 3rem;
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
}

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

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

/* Skip Link for Accessibility */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-accent);
  color: white;
  padding: 8px;
  text-decoration: none;
  z-index: 100;
}

.skip-link:focus {
  top: 0;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ==========================================
   NAVIGATION
   ========================================== */
.main-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
  transition: transform var(--transition-base);
}

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

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.logo:hover {
  color: var(--color-accent);
}

.nav-links {
  display: flex;
  gap: var(--spacing-md);
  list-style: none;
}

.nav-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: color var(--transition-fast);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-fast);
}

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

.nav-links a:hover::after {
  width: 100%;
}

/* Language Switch */
.lang-switch {
  display: flex;
  gap: var(--spacing-xs);
  background: var(--color-bg-card);
  border-radius: 6px;
  padding: 4px;
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  padding: 6px 12px;
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: 500;
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.lang-btn:hover {
  color: var(--color-text);
  background: var(--color-border);
}

.lang-btn.active {
  background: var(--color-accent);
  color: white;
}

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(60px + var(--spacing-lg)) var(--spacing-md) var(--spacing-lg);
}

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

.hero-greeting {
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xs);
  animation: fadeInUp 0.6s ease;
}

.hero-name {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
  background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero-title {
  font-size: var(--font-size-2xl);
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero-subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  max-width: 540px;
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
  animation: fadeInUp 0.6s ease 0.3s both;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  animation: fadeInUp 0.6s ease 0.4s both;
}

/* Hero Image */
.hero-image {
  display: flex;
  justify-content: center;
  animation: fadeIn 0.8s ease 0.5s both;
}

.image-wrapper {
  position: relative;
  width: 320px;
  height: 320px;
}

.image-wrapper::before {
  content: '';
  position: absolute;
  inset: -8px;
  background: linear-gradient(135deg, var(--color-accent), #8b5cf6);
  border-radius: 50%;
  opacity: 0.2;
  animation: pulse 3s ease-in-out infinite;
}

.image-wrapper img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 4px solid var(--color-border);
  position: relative;
  z-index: 1;
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
  display: inline-block;
  padding: 12px 28px;
  font-size: var(--font-size-base);
  font-weight: 500;
  text-decoration: none;
  border-radius: 6px;
  transition: all var(--transition-base);
  cursor: pointer;
  border: 2px solid transparent;
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  border-color: var(--color-border);
  color: var(--color-text);
  background: transparent;
}

.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  transform: translateY(-2px);
}

.btn-download {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  background: var(--color-bg-card);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-download:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.download-icon {
  font-size: 1.2rem;
}

/* ==========================================
   SECTIONS
   ========================================== */
.section {
  padding: var(--spacing-xl) 0;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: var(--spacing-lg);
  text-align: center;
  position: relative;
  display: inline-block;
  left: 50%;
  transform: translateX(-50%);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -12px;
  left: 50%;
  transform: translateX(-50%);
  width: 60px;
  height: 4px;
  background: var(--color-accent);
  border-radius: 2px;
}

/* ==========================================
   ABOUT SECTION
   ========================================== */
.about-section {
  background: var(--color-bg-secondary);
}

.about-text {
  font-size: var(--font-size-lg);
  color: var(--color-text-muted);
  max-width: 800px;
  margin: 0 auto var(--spacing-lg);
  text-align: center;
  line-height: 1.8;
}

.about-highlights {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.highlight-item {
  background: var(--color-bg-card);
  padding: var(--spacing-md);
  border-radius: 12px;
  border: 1px solid var(--color-border);
  text-align: center;
  transition: all var(--transition-base);
}

.highlight-item:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.highlight-icon {
  font-size: 3rem;
  display: block;
  margin-bottom: var(--spacing-sm);
}

.highlight-item h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.highlight-item p {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* ==========================================
   SKILLS SECTION
   ========================================== */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.skill-card {
  background: var(--color-bg-card);
  padding: var(--spacing-md);
  border-radius: 12px;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.skill-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.skill-icon {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.skill-card h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.skill-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.skill-list li {
  color: var(--color-text-muted);
  font-size: var(--font-size-base);
  padding-left: 20px;
  position: relative;
}

.skill-list li::before {
  content: '▹';
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
}

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

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

.project-card {
  background: var(--color-bg-card);
  padding: var(--spacing-md);
  border-radius: 12px;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.project-upcoming {
  opacity: 0.7;
  position: relative;
}

.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--spacing-sm);
  gap: var(--spacing-sm);
}

.project-header h3 {
  font-size: var(--font-size-xl);
  color: var(--color-text);
  flex: 1;
}

.project-tag {
  background: var(--color-border);
  color: var(--color-text-muted);
  padding: 4px 12px;
  border-radius: 12px;
  font-size: var(--font-size-sm);
  font-weight: 500;
  white-space: nowrap;
}

.project-tag-progress {
  background: rgba(59, 130, 246, 0.2);
  color: var(--color-accent);
}

.project-description {
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--spacing-md);
  flex: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
}

.tech-tag {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  padding: 4px 10px;
  border-radius: 6px;
  font-size: 0.8rem;
  font-weight: 500;
}

/* ==========================================
   CV SECTION
   ========================================== */
.cv-section {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.05) 0%, rgba(139, 92, 246, 0.05) 100%);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.cv-container {
  text-align: center;
}

.cv-content h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-sm);
}

.cv-content p {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
  font-size: var(--font-size-lg);
}

/* ==========================================
   CONTACT SECTION
   ========================================== */
.contact-section {
  background: var(--color-bg-secondary);
}

.contact-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
  max-width: 600px;
  margin: 0 auto var(--spacing-lg);
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
}

.contact-card {
  background: var(--color-bg-card);
  padding: var(--spacing-md);
  border-radius: 12px;
  border: 1px solid var(--color-border);
  text-align: center;
  text-decoration: none;
  transition: all var(--transition-base);
  display: block;
}

.contact-card:hover {
  border-color: var(--color-accent);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.contact-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-sm);
}

.contact-card h3 {
  font-size: var(--font-size-xl);
  color: var(--color-text);
  margin-bottom: var(--spacing-xs);
}

.contact-card p {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  word-break: break-word;
}

/* ==========================================
   PHILOSOPHY BUTTON & MODAL
   ========================================== */
.philosophy-btn {
  position: fixed;
  bottom: 24px;
  right: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-base);
  z-index: 999;
}

.philosophy-btn:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: white;
  transform: scale(1.1);
  box-shadow: var(--shadow-lg);
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 9999;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
}

.modal.active {
  display: flex;
}

.modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  backdrop-filter: blur(4px);
  animation: fadeIn 0.3s ease;
}

.modal-content {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--spacing-lg);
  max-width: 500px;
  width: 100%;
  position: relative;
  z-index: 1;
  animation: slideUp 0.3s ease;
}

.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: transparent;
  border: none;
  color: var(--color-text-muted);
  font-size: 2rem;
  cursor: pointer;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  transition: all var(--transition-fast);
}

.modal-close:hover {
  background: var(--color-border);
  color: var(--color-text);
}

.modal-content h3 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text);
}

.philosophy-text {
  color: var(--color-text-muted);
  line-height: 1.8;
  font-size: var(--font-size-lg);
  font-style: italic;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-md) 0;
  text-align: center;
}

.footer p {
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

.footer-tagline {
  margin-top: var(--spacing-xs);
  font-style: italic;
  opacity: 0.7;
}

/* ==========================================
   ANIMATIONS
   ========================================== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(40px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
    opacity: 0.2;
  }
  50% {
    transform: scale(1.05);
    opacity: 0.3;
  }
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  
  .hero-image {
    order: -1;
  }
  
  .image-wrapper {
    width: 240px;
    height: 240px;
  }
  
  .hero-subtitle {
    max-width: 100%;
  }
  
  .hero-cta {
    justify-content: center;
  }
  
  .section {
    padding: var(--spacing-lg) 0;
  }
  
  .skills-grid,
  .projects-grid,
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
  }
  
  .hero {
    padding-top: calc(60px + var(--spacing-md));
  }
  
  .btn {
    width: 100%;
    text-align: center;
  }
  
  .modal-content {
    padding: var(--spacing-md);
  }
}

/* ===================================
   PROJECT FILTERS
   =================================== */

.project-filters {
  display: flex;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 3rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.75rem 1.5rem;
  background: transparent;
  border: 2px solid var(--primary-color);
  color: var(--text-color);
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s ease;
  font-family: inherit;
}

.filter-btn:hover {
  background: var(--primary-color);
  color: #fff;
  transform: translateY(-2px);
}

.filter-btn.active {
  background: var(--primary-color);
  color: #fff;
  box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
}

/* Project card animations */
.project-card {
  transition: all 0.4s ease;
}

.project-card.hidden {
  display: none;
  opacity: 0;
  transform: scale(0.8);
}

.project-card.visible {
  display: block;
  opacity: 1;
  transform: scale(1);
  animation: fadeInUp 0.5s ease forwards;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Mobile responsiveness for filters */
@media (max-width: 768px) {
  .project-filters {
    gap: 0.5rem;
  }

  .filter-btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  .filter-btn {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
  }
}