/* Base custom properties & Design System tokens */
:root {
  /* Dark theme colors (Default) */
  --bg-primary: #0a0a0c;
  --bg-secondary: #121217;
  --text-primary: #f3f4f6;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  
  /* Accent Colors */
  --accent-1: #00f2fe; /* Neon cyan */
  --accent-2: #4facfe; /* Electric blue */
  --accent-3: #7f00ff; /* Deep violet */
  --accent-gradient: linear-gradient(135deg, var(--accent-1) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
  
  /* Card backgrounds */
  --card-bg: rgba(20, 20, 27, 0.6);
  --card-border: rgba(255, 255, 255, 0.05);
  --card-glow: rgba(0, 242, 254, 0.15);

  --font-display: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  --transition-smooth: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-fast: all 0.2s ease;
}

/* Light theme colors override */
html.light {
  --bg-primary: #f8fafc;
  --bg-secondary: #ffffff;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  
  --accent-1: #0ea5e9;
  --accent-2: #2563eb;
  --accent-3: #7c3aed;
  
  --card-bg: rgba(255, 255, 255, 0.7);
  --card-border: rgba(0, 0, 0, 0.06);
  --card-glow: rgba(14, 165, 233, 0.1);
}

/* Global Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--bg-primary);
  overflow-x: hidden;
}

body {
  min-height: 100vh;
  position: relative;
  line-height: 1.6;
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: var(--text-muted);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--text-secondary);
}

/* Ambient glow backgrounds */
.bg-glow-1 {
  position: absolute;
  top: 5%;
  left: 10%;
  width: 50vw;
  height: 50vw;
  background: radial-gradient(circle, rgba(0, 242, 254, 0.12) 0%, rgba(127, 0, 255, 0.03) 70%, transparent 100%);
  z-index: -2;
  pointer-events: none;
  filter: blur(80px);
}

.bg-glow-2 {
  position: absolute;
  top: 60%;
  right: 5%;
  width: 45vw;
  height: 45vw;
  background: radial-gradient(circle, rgba(127, 0, 255, 0.12) 0%, rgba(0, 242, 254, 0.03) 70%, transparent 100%);
  z-index: -2;
  pointer-events: none;
  filter: blur(80px);
}

.grid-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 50px 50px;
  z-index: -1;
  pointer-events: none;
}

/* Layout Utilities */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* Header & Nav */
.main-header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  background-color: rgba(10, 10, 12, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--card-border);
  transition: var(--transition-smooth);
}

html.light .main-header {
  background-color: rgba(248, 250, 252, 0.8);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  color: var(--text-primary);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: 2px;
}

.logo-dot {
  width: 8px;
  height: 8px;
  background: var(--accent-gradient);
  border-radius: 50%;
  margin-right: 8px;
}

.nav-menu {
  display: flex;
  gap: 2.5rem;
}

.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: var(--transition-fast);
  position: relative;
  padding: 0.5rem 0;
}

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

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

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition-smooth);
  border: 1px solid transparent;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #ffffff;
  box-shadow: 0 4px 20px rgba(0, 242, 254, 0.2);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 242, 254, 0.35);
}

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

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--text-secondary);
  transform: translateY(-2px);
}

.cta-btn-header {
  padding: 0.5rem 1.2rem;
  background: transparent;
  border: 1px solid var(--accent-1);
  color: var(--text-primary);
  font-size: 0.9rem;
  border-radius: 20px;
  text-decoration: none;
  transition: var(--transition-fast);
}

.cta-btn-header:hover {
  background: var(--accent-gradient);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 4px 12px rgba(0, 242, 254, 0.15);
}

/* Theme Toggle Button */
.theme-btn {
  background: transparent;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  transition: var(--transition-fast);
}

.theme-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

.sun-icon { display: none; }
.moon-icon { display: block; }

html.light .sun-icon { display: block; }
html.light .moon-icon { display: none; }

/* Hero Section */
.hero-section {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  padding-top: 100px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--card-border);
  border-radius: 30px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.badge-dot {
  width: 6px;
  height: 6px;
  background: #10b981; /* bright green */
  border-radius: 50%;
  animation: pulse 1.8s infinite;
}

@keyframes pulse {
  0% { transform: scale(0.9); opacity: 0.6; }
  50% { transform: scale(1.2); opacity: 1; }
  100% { transform: scale(0.9); opacity: 0.6; }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4.8rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 1.5rem;
}

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

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  color: var(--text-secondary);
  max-width: 650px;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
}

.hero-scroll-indicator {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
  letter-spacing: 1px;
}

.mouse {
  width: 22px;
  height: 36px;
  border: 2px solid var(--text-muted);
  border-radius: 12px;
  display: flex;
  justify-content: center;
  padding-top: 6px;
}

.wheel {
  width: 4px;
  height: 8px;
  background: var(--text-secondary);
  border-radius: 2px;
  animation: scrollMouse 1.5s infinite;
}

@keyframes scrollMouse {
  0% { transform: translateY(0); opacity: 1; }
  50% { transform: translateY(6px); opacity: 0.2; }
  100% { transform: translateY(0); opacity: 1; }
}

/* Glassmorphism General Cards */
.glass-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  position: relative;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.card-glow {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), var(--card-glow) 0%, transparent 50%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
  z-index: 1;
}

.glass-card:hover .card-glow {
  opacity: 1;
}

/* Sections Base */
section {
  padding: 8rem 0;
}

.section-header {
  margin-bottom: 4rem;
}

.section-tag {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-1);
  letter-spacing: 2px;
  text-transform: uppercase;
  display: block;
  margin-bottom: 0.5rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 800;
}

/* About Section */
.about-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 4rem;
  align-items: center;
}

.about-lead {
  font-size: 1.2rem;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.stats-row {
  display: flex;
  gap: 3rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-num {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 800;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Profile Card */
.profile-card {
  padding: 2.5rem;
}

.profile-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.avatar-placeholder {
  width: 70px;
  height: 70px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.02);
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--card-border);
}

.avatar-svg {
  width: 50px;
  height: 50px;
}

.profile-title h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
}

.profile-title p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.bio-line {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--card-border);
  font-size: 0.9rem;
}

.bio-line:last-child {
  border-bottom: none;
}

.bio-line strong {
  color: var(--text-secondary);
}

.bio-line span {
  color: var(--text-primary);
}

/* Projects Section */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 2.5rem;
}

.project-card {
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  border-radius: 16px;
  overflow: hidden;
  transition: var(--transition-smooth);
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--text-muted);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2);
}

.project-image-wrapper {
  position: relative;
  height: 220px;
  overflow: hidden;
}

.project-placeholder-img {
  width: 100%;
  height: 100%;
  position: relative;
  transition: var(--transition-smooth);
}

/* Elegant dark modern patterns for placeholders */
.visual-1 {
  background: linear-gradient(135deg, #09090b 0%, #1c1917 100%);
}
.visual-1 .visual-accent {
  position: absolute;
  top: 30%;
  left: 30%;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle, var(--accent-1) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(20px);
  animation: float1 4s ease-in-out infinite;
}

.visual-2 {
  background: linear-gradient(135deg, #09090b 0%, #0c0a09 100%);
}
.visual-2 .visual-accent {
  position: absolute;
  top: 40%;
  right: 20%;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, var(--accent-2) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(25px);
  animation: float2 5s ease-in-out infinite;
}

.visual-3 {
  background: linear-gradient(135deg, #09090b 0%, #17171c 100%);
}
.visual-3 .visual-accent {
  position: absolute;
  bottom: 20%;
  left: 40%;
  width: 90px;
  height: 90px;
  background: radial-gradient(circle, var(--accent-3) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(20px);
  animation: float1 6s ease-in-out infinite;
}

@keyframes float1 {
  0% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-15px) scale(1.1); }
  100% { transform: translateY(0) scale(1); }
}

@keyframes float2 {
  0% { transform: translate(0, 0) scale(1.2); }
  50% { transform: translate(-10px, 10px) scale(0.9); }
  100% { transform: translate(0, 0) scale(1.2); }
}

.project-card:hover .project-placeholder-img {
  transform: scale(1.05);
}

.project-tags {
  position: absolute;
  bottom: 12px;
  left: 12px;
  display: flex;
  gap: 6px;
  z-index: 2;
}

.tag {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 4px 10px;
  background: rgba(10, 10, 12, 0.75);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 4px;
}

.project-info {
  padding: 1.5rem;
}

.project-title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.project-desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  height: 4.8em;
}

.project-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent-1);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 600;
}

.project-link svg {
  transition: transform 0.2s ease;
}

.project-link:hover svg {
  transform: translateX(4px);
}

/* Skills Section */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
}

.skill-card {
  padding: 2.5rem;
}

.skill-card:hover {
  border-color: var(--accent-1);
  transform: translateY(-4px);
  box-shadow: 0 8px 25px var(--card-glow);
}

.skill-icon {
  width: 50px;
  height: 50px;
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.1) 0%, rgba(127, 0, 255, 0.1) 100%);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-1);
  margin-bottom: 1.5rem;
  border: 1px solid rgba(0, 242, 254, 0.15);
}

.skill-card h3 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.skill-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* Contact Section */
.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 5rem;
}

.contact-lead-text {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 3rem;
}

.contact-methods {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.contact-method-item {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.icon-circle {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--card-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-1);
}

.contact-method-item h4 {
  font-size: 0.85rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
}

.contact-method-item p a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition-fast);
}

.contact-method-item p a:hover {
  color: var(--accent-1);
}

.contact-form {
  padding: 3rem;
}

.form-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 2rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.form-group input, .form-group textarea {
  width: 100%;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--card-border);
  border-radius: 8px;
  padding: 0.8rem 1rem;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.95rem;
  transition: var(--transition-smooth);
}

.form-group input:focus, .form-group textarea:focus {
  outline: none;
  border-color: var(--accent-1);
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.15);
}

.form-submit-btn {
  width: 100%;
  padding: 0.9rem;
  gap: 8px;
  z-index: 2;
  position: relative;
}

.form-status {
  margin-top: 1rem;
  font-size: 0.9rem;
  text-align: center;
}

.form-status.success {
  color: #10b981;
}

.form-status.error {
  color: #ef4444;
}

/* Footer */
.main-footer {
  border-top: 1px solid var(--card-border);
  padding: 3rem 0;
  background-color: var(--bg-secondary);
}

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

.copyright {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

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

.separator {
  color: rgba(255, 255, 255, 0.05);
}

/* Mobile responsive menu button */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 24px;
  height: 18px;
  background: transparent;
  border: none;
  cursor: pointer;
  z-index: 200;
}

.mobile-toggle span {
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition-fast);
}

/* Reveal on scroll base classes */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive Breakpoints */
@media (max-width: 992px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
  
  .contact-container {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    position: fixed;
    top: 80px;
    left: 100%;
    width: 100%;
    height: calc(100vh - 80px);
    background-color: var(--bg-primary);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    transition: var(--transition-smooth);
    border-top: 1px solid var(--card-border);
  }

  .nav-menu.open {
    left: 0;
  }

  .mobile-toggle {
    display: flex;
  }

  .mobile-toggle.open span:first-child {
    transform: translateY(8px) rotate(45deg);
  }

  .mobile-toggle.open span:last-child {
    transform: translateY(-8px) rotate(-45deg);
  }

  .mobile-toggle.open span:nth-child(2) {
    opacity: 0;
  }

  .header-actions .cta-btn-header {
    display: none;
  }

  .stats-row {
    justify-content: space-between;
  }
  
  .contact-form {
    padding: 2rem;
  }
}