:root {
  /* Color System */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-tertiary: #1a1a28;
  --color-accent-primary: #6366f1;
  --color-accent-secondary: #8b5cf6;
  --color-accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
  --color-text-primary: #ffffff;
  --color-text-secondary: #a8a8b8;
  --color-text-muted: #6b6b7b;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  /* Glass Effect */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);

  /* Typography */
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Outfit', var(--font-primary);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  /* Border Radius */
  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 1.5rem;
  --radius-xl: 2rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;

  /* Container */
  --container-max-width: 1200px;
  --container-padding: var(--spacing-md);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-primary);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Animated background gradient */
body::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
    radial-gradient(circle at 80% 80%, rgba(139, 92, 246, 0.15) 0%, transparent 50%);
  animation: gradientShift 15s ease infinite;
  z-index: -1;
  pointer-events: none;
}

@keyframes gradientShift {

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

  50% {
    transform: translate(-10%, -10%);
  }
}

/* === TYPOGRAPHY === */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-display);
  line-height: 1.2;
  font-weight: 700;
}

h1 {
  font-size: clamp(2.5rem, 8vw, 4.5rem);
}

h2 {
  font-size: clamp(2rem, 5vw, 3rem);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
  font-size: 1.25rem;
}

p {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
}

a {
  color: inherit;
  text-decoration: none;
}

/* === UTILITIES === */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

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

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
  box-shadow: var(--glass-shadow);
}

.hidden {
  display: none !important;
}

/* === HEADER === */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--spacing-md) 0;
  transition: all var(--transition-base);
}

.header.scrolled {
  background: rgba(10, 10, 15, 0.8);
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  font-family: var(--font-display);
}

.nav {
  display: flex;
  gap: var(--spacing-lg);
  align-items: center;
}

.nav a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  font-weight: 500;
  font-size: 0.95rem;
}

.nav a:hover {
  color: var(--color-accent-primary);
}

.admin-toggle {
  padding: 0.5rem 1rem;
  background: var(--color-accent-gradient);
  border: none;
  border-radius: var(--radius-sm);
  color: white;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  font-size: 0.9rem;
}

.admin-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(99, 102, 241, 0.4);
}

/* === HERO SECTION === */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-3xl) 0;
  position: relative;
}

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

.hero-image {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--glass-border);
  box-shadow: 0 0 40px rgba(99, 102, 241, 0.3);
  margin-bottom: var(--spacing-lg);
  animation: float 3s ease-in-out infinite;
}

@keyframes float {

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

  50% {
    transform: translateY(-10px);
  }
}

.hero h1 {
  margin-bottom: var(--spacing-sm);
}

.hero .title {
  font-size: clamp(1.2rem, 3vw, 1.5rem);
  color: var(--color-accent-primary);
  margin-bottom: var(--spacing-md);
  font-weight: 600;
}

.hero .bio {
  max-width: 600px;
  margin: 0 auto var(--spacing-xl);
  font-size: 1.15rem;
}

.hero-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
}

.btn {
  padding: 1rem 2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

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

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
  background: var(--glass-bg);
  border: 2px solid var(--glass-border);
  color: var(--color-text-primary);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  border-color: var(--color-accent-primary);
  background: rgba(99, 102, 241, 0.1);
}

/* === SECTION === */
.section {
  padding: var(--spacing-3xl) 0;
  position: relative;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title {
  margin-bottom: var(--spacing-sm);
}

.section-subtitle {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
}

/* === ABOUT SECTION === */
.about-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xl);
  align-items: center;
}

.about-text {
  animation: fadeInLeft 0.8s ease;
}

.about-text p {
  margin-bottom: var(--spacing-md);
  font-size: 1.05rem;
  line-height: 1.8;
}

.about-image-wrapper {
  animation: fadeInRight 0.8s ease;
}

.about-image {
  width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

/* === PROJECTS SECTION === */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
}

.project-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
}

.project-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 20px 40px rgba(99, 102, 241, 0.3);
}

.project-image {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.project-content {
  padding: var(--spacing-md);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
  border-top: 1px solid var(--glass-border);
}

.project-title {
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
}

.project-description {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

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

.tag {
  padding: 0.25rem 0.75rem;
  background: rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--color-accent-primary);
  font-weight: 500;
}

.project-link {
  color: var(--color-accent-primary);
  font-weight: 600;
  font-size: 0.9rem;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: gap var(--transition-fast);
}

.project-link:hover {
  gap: 0.5rem;
}

/* === SKILLS SECTION === */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-lg);
}

.skill-card {
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.skill-card:hover {
  transform: translateY(-5px);
}

.skill-name {
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--color-text-primary);
}

.skill-level {
  height: 8px;
  background: var(--color-bg-tertiary);
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}

.skill-level-fill {
  height: 100%;
  background: var(--color-accent-gradient);
  border-radius: 999px;
  transition: width 1s ease;
  position: relative;
}

.skill-level-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% {
    transform: translateX(-100%);
  }

  100% {
    transform: translateX(100%);
  }
}

.skill-category {
  margin-top: var(--spacing-xs);
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* === CONTACT SECTION === */
.contact-content {
  max-width: 600px;
  margin: 0 auto;
  text-align: center;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
}

.contact-item {
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  transition: all var(--transition-base);
}

.contact-item:hover {
  transform: translateX(5px);
  background: rgba(99, 102, 241, 0.1);
}

.contact-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-gradient);
  border-radius: var(--radius-md);
  font-size: 1.5rem;
}

.contact-info {
  text-align: left;
  flex: 1;
}

.contact-label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: 0.25rem;
}

.contact-value {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

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

.certification-card {
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
  border: 1px solid var(--glass-border);
}

.certification-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 30px rgba(99, 102, 241, 0.2);
}

.certification-name {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
}

.certification-issuer {
  color: var(--color-accent-primary);
  font-weight: 500;
  margin-bottom: var(--spacing-sm);
}

.certification-date {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

.certification-link {
  color: var(--color-accent-primary);
  font-size: 0.9rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: gap var(--transition-fast);
}

.certification-link:hover {
  gap: 0.5rem;
}

/* === EXPERIENCE SECTION === */
.experience-timeline {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  padding-left: var(--spacing-xl);
}

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

.experience-item {
  position: relative;
  padding: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.experience-item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--spacing-xl) - 6px);
  top: var(--spacing-lg);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--color-accent-primary);
  border: 3px solid var(--color-bg-primary);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

.experience-item:hover {
  transform: translateX(10px);
  background: rgba(99, 102, 241, 0.05);
}

.experience-header {
  margin-bottom: var(--spacing-md);
}

.experience-title {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--color-text-primary);
}

.experience-company {
  color: var(--color-accent-primary);
  font-weight: 500;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.experience-period {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.experience-description {
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* === VIDEOS SECTION === */
.videos-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--spacing-lg);
}

.video-card {
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
}

.video-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(99, 102, 241, 0.3);
}

.video-embed {
  position: relative;
  padding-bottom: 56.25%;
  /* 16:9 aspect ratio */
  height: 0;
  overflow: hidden;
  background: var(--color-bg-tertiary);
}

.video-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-content {
  padding: var(--spacing-md);
  background: var(--glass-bg);
  backdrop-filter: blur(10px);
}

.video-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
}

.video-description {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
}

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

.footer p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

/* === ADMIN PANEL === */
.admin-panel {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  height: 100vh;
  background: var(--color-bg-secondary);
  border-left: 1px solid var(--glass-border);
  box-shadow: -10px 0 40px rgba(0, 0, 0, 0.5);
  z-index: 2000;
  overflow-y: auto;
  transition: right var(--transition-base);
  padding: var(--spacing-lg);
}

.admin-panel.active {
  right: 0;
}

.admin-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--glass-border);
}

.admin-close {
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  line-height: 1;
  transition: color var(--transition-fast);
}

.admin-close:hover {
  color: var(--color-error);
}

.admin-section {
  margin-bottom: var(--spacing-xl);
}

.admin-section h3 {
  margin-bottom: var(--spacing-md);
  font-size: 1.2rem;
  color: var(--color-accent-primary);
}

.form-group {
  margin-bottom: var(--spacing-md);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-text-secondary);
}

.form-input,
.form-textarea,
.form-select {
  width: 100%;
  padding: 0.75rem;
  background: var(--color-bg-tertiary);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-primary);
  font-family: var(--font-primary);
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}

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

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.admin-actions {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--glass-border);
}

.btn-save {
  flex: 1;
  background: var(--color-success);
  color: white;
  padding: 0.75rem;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-save:hover {
  background: #059669;
  transform: translateY(-2px);
}

.btn-reset {
  flex: 1;
  background: var(--color-error);
  color: white;
  padding: 0.75rem;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.btn-reset:hover {
  background: #dc2626;
  transform: translateY(-2px);
}

.project-editor,
.skill-editor {
  padding: var(--spacing-md);
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  border: 1px solid var(--glass-border);
}

.btn-add,
.btn-remove {
  width: 100%;
  padding: 0.75rem;
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-top: var(--spacing-sm);
}

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

.btn-add:hover {
  background: #4f46e5;
}

.btn-remove {
  background: rgba(239, 68, 68, 0.2);
  color: var(--color-error);
  border: 1px solid var(--color-error);
}

.btn-remove:hover {
  background: var(--color-error);
  color: white;
}

/* === MODAL === */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  z-index: 3000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
  backdrop-filter: blur(5px);
}

.modal-content {
  background: var(--color-bg-secondary);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  max-width: 400px;
  width: 100%;
  border: 1px solid var(--glass-border);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.7);
}

.modal-content h2 {
  margin-bottom: var(--spacing-md);
  font-size: 1.8rem;
}

.modal-content p {
  margin-bottom: var(--spacing-lg);
  color: var(--color-text-secondary);
}

.modal-actions {
  display: flex;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.modal-actions .btn {
  flex: 1;
}

/* === 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);
  }
}

/* === RESPONSIVE === */
@media (max-width: 1024px) {
  .admin-panel {
    width: 100%;
    right: -100%;
  }
}

@media (max-width: 768px) {
  :root {
    --container-padding: var(--spacing-sm);
  }

  .nav {
    display: none;
  }

  .about-content {
    grid-template-columns: 1fr;
  }

  .projects-grid {
    grid-template-columns: 1fr;
  }

  .skills-grid {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    flex-direction: column;
    width: 100%;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

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

/* === SCROLLBAR === */
::-webkit-scrollbar {
  width: 10px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--color-accent-primary);
  border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent-secondary);
}