/* ============================================
   MODERN PORTFOLIO - CSS DESIGN SYSTEM
   ============================================ */

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ============================================
   CSS VARIABLES - DESIGN TOKENS
   ============================================ */

:root {
  /* Colors - Dark Mode (Default) */
  --bg-primary: #0a0e27;
  --bg-secondary: #1a1a2e;
  --bg-card: rgba(26, 26, 46, 0.6);
  --text-primary: #ffffff;
  --text-secondary: #e2e8f0;
  --text-muted: #94a3b8;

  /* Accent Colors */
  --accent-primary: #6366f1;
  --accent-secondary: #3b82f6;
  --accent-gradient: linear-gradient(135deg, #6366f1 0%, #3b82f6 100%);

  /* UI Elements */
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 2px 8px rgba(99, 102, 241, 0.1);
  --shadow-md: 0 4px 16px rgba(99, 102, 241, 0.15);
  --shadow-lg: 0 8px 32px rgba(99, 102, 241, 0.2);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 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: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* Light Mode Variables */
[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: rgba(248, 250, 252, 0.8);
  --text-primary: #1e293b;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --border-color: rgba(0, 0, 0, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
  --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.2);
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

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

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

/* Animated Background */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(59, 130, 246, 0.1) 0%, transparent 50%);
  pointer-events: none;
  z-index: -1;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-5xl);
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

h2 {
  font-size: var(--font-size-4xl);
  color: var(--text-primary);
}

h3 {
  font-size: var(--font-size-2xl);
  color: var(--text-primary);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
}

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

a:hover {
  color: var(--accent-secondary);
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: var(--spacing-md) 0;
  background: rgba(10, 14, 39, 0.8);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  transition: all var(--transition-base);
}

[data-theme="light"] .header {
  background: rgba(255, 255, 255, 0.8);
}

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

.logo {
  font-size: var(--font-size-xl);
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-menu {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
  align-items: center;
}

.nav-link {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  transition: width var(--transition-base);
}

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

/* Theme Toggle Button */
.theme-toggle {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-xs) var(--spacing-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: all var(--transition-base);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.theme-toggle:hover {
  background: var(--accent-gradient);
  color: white;
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: var(--font-size-2xl);
  cursor: pointer;
}

/* ============================================
   CONTAINER & SECTION LAYOUTS
   ============================================ */

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.section {
  padding: var(--spacing-2xl) 0;
  min-height: auto;
}

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

.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: var(--accent-gradient);
  margin: var(--spacing-md) auto 0;
  border-radius: 2px;
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding-top: 80px;
  position: relative;
}

.hero-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  flex-wrap: wrap;
  justify-content: center;
}

.hero-image {
  flex: 0 0 300px;
  animation: float 3s ease-in-out infinite;
}

.hero-image img {
  width: 100%;
  height: auto;
  border-radius: 50%;
  border: 4px solid var(--accent-primary);
  box-shadow: var(--shadow-glow);
}

@keyframes float {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(-20px);
  }
}

.hero-text {
  flex: 1;
  min-width: 300px;
  max-width: 600px;
}

.hero-greeting {
  font-size: var(--font-size-lg);
  color: var(--accent-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
}

.hero-name {
  font-size: var(--font-size-5xl);
  margin-bottom: var(--spacing-sm);
}

.hero-role {
  font-size: var(--font-size-xl);
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.hero-description {
  font-size: var(--font-size-base);
  color: var(--text-muted);
  margin-bottom: var(--spacing-lg);
  line-height: 1.8;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
}

.btn {
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--font-size-base);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  display: inline-block;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

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

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

/* ============================================
   ABOUT SECTION
   ============================================ */

.about-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.about-text {
  font-size: var(--font-size-lg);
  line-height: 1.8;
  color: var(--text-secondary);
}

/* ============================================
   SKILLS SECTION
   ============================================ */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

.skill-category {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
}

.skill-category:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-glow);
  border-color: var(--accent-primary);
}

.skill-category h3 {
  color: var(--accent-primary);
  margin-bottom: var(--spacing-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.skill-category h3::before {
  content: '⚡';
  font-size: var(--font-size-2xl);
}

.skill-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.skill-tag {
  background: rgba(99, 102, 241, 0.1);
  color: var(--text-primary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 500;
  border: 1px solid rgba(99, 102, 241, 0.2);
  transition: all var(--transition-fast);
}

.skill-tag:hover {
  background: var(--accent-gradient);
  color: white;
  transform: scale(1.05);
}

/* ============================================
   PROJECTS SECTION
   ============================================ */

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

.project-card {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
}
.project-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-glow);
  border-color: var(--accent-primary);
}

.project-image {
  width: 100%;
  height: 200px;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-4xl);
  color: white;
}

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

.project-title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

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

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

.tech-tag {
  background: rgba(99, 102, 241, 0.1);
  color: var(--accent-primary);
  padding: 4px var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
}

.project-placeholder {
  opacity: 0.6;
  border: 2px dashed var(--border-color);
}

.project-placeholder .project-image {
  background: var(--bg-secondary);
  color: var(--text-muted);
}

/* ============================================
   CODING PROFILES SECTION
   ============================================ */

.coding-profiles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.profile-card {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  text-align: center;
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  text-decoration: none;
}

.profile-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-glow);
  border-color: var(--accent-primary);
}

.profile-icon {
  width: 80px;
  height: 80px;
  background: var(--accent-gradient);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  transition: all var(--transition-base);
}

.profile-icon img {
  width: 100%;
  height: 100%;
  filter: brightness(0) invert(1);
}

.profile-card:hover .profile-icon {
  transform: scale(1.1) rotate(5deg);
}

.profile-name {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
  margin: 0;
}

.profile-stats {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin: 0;
}

/* ============================================
   CERTIFICATIONS SECTION
   ============================================ */

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

.cert-card {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.cert-card::before {
  content: '🏆';
  position: absolute;
  top: -10px;
  right: -10px;
  font-size: 4rem;
  opacity: 0.1;
}

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

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

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

/* ============================================
   ACHIEVEMENTS SECTION
   ============================================ */

.achievements-list {
  max-width: 800px;
  margin: var(--spacing-xl) auto 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.achievement-item {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-left: 4px solid var(--accent-primary);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.achievement-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
}

.achievement-icon {
  font-size: var(--font-size-3xl);
  flex-shrink: 0;
}

.achievement-text {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================
   EDUCATION SECTION
   ============================================ */

.education-timeline {
  max-width: 800px;
  margin: var(--spacing-xl) auto 0;
  position: relative;
}

.education-item {
  background: var(--bg-card);
  backdrop-filter: blur(10px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
  transition: all var(--transition-base);
  position: relative;
  padding-left: var(--spacing-2xl);
}

.education-item::before {
  content: '🎓';
  position: absolute;
  left: var(--spacing-md);
  top: var(--spacing-lg);
  font-size: var(--font-size-2xl);
}

.education-item:hover {
  transform: translateX(8px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent-primary);
}

.education-degree {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin-bottom: var(--spacing-xs);
  color: var(--text-primary);
}

.education-institution {
  font-size: var(--font-size-base);
  color: var(--accent-primary);
  margin-bottom: var(--spacing-xs);
}

.education-score {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: var(--spacing-sm);
}

/* ============================================
   CONTACT SECTION
   ============================================ */

.contact-content {
  max-width: 600px;
  margin: var(--spacing-xl) auto 0;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.form-label {
  font-weight: 600;
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.form-input,
.form-textarea {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--text-primary);
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  transition: all var(--transition-base);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-textarea {
  min-height: 150px;
  resize: vertical;
}

.form-submit {
  margin-top: var(--spacing-sm);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-2xl);
}

.footer-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

.footer-section {
  text-align: center;
}

.footer-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  color: var(--text-primary);
}

.social-links,
.coding-links {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  justify-content: center;
}

.social-icon,
.coding-icon {
  width: 48px;
  height: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px;
  transition: all var(--transition-base);
  cursor: pointer;
}

.social-icon img,
.coding-icon img {
  width: 100%;
  height: 100%;
  transition: all var(--transition-base);
}

.social-icon:hover,
.coding-icon:hover {
  background: var(--accent-gradient);
  transform: translateY(-4px) scale(1.1);
  box-shadow: var(--shadow-glow);
  border-color: transparent;
}

.social-icon:hover img,
.coding-icon:hover img {
  filter: brightness(0) invert(1);
}

.footer-divider {
  width: 100%;
  height: 1px;
  background: var(--border-color);
  margin: var(--spacing-md) 0;
}

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

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
  html {
    font-size: 14px;
  }

  .nav-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--bg-secondary);
    flex-direction: column;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--border-color);
  }

  .nav-menu.active {
    display: flex;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .hero-content {
    flex-direction: column;
    text-align: center;
  }

  .hero-image {
    flex: 0 0 200px;
  }

  .hero-cta {
    justify-content: center;
  }

  .skills-grid,
  .projects-grid,
  .coding-profiles-grid,
  .certifications-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero-name {
    font-size: var(--font-size-3xl);
  }

  .section-title h2 {
    font-size: var(--font-size-3xl);
  }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

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

.text-gradient {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.mt-1 {
  margin-top: var(--spacing-sm);
}

.mt-2 {
  margin-top: var(--spacing-md);
}

.mt-3 {
  margin-top: var(--spacing-lg);
}

.mb-1 {
  margin-bottom: var(--spacing-sm);
}

.mb-2 {
  margin-bottom: var(--spacing-md);
}

.mb-3 {
  margin-bottom: var(--spacing-lg);
}