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

:root {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --accent-primary: #2563eb;
  --accent-secondary: #f97316;
  --accent-glow: rgba(37, 99, 235, 0.1);
  --card-bg: rgba(255, 255, 255, 0.8);
  --card-border: rgba(226, 232, 240, 0.8);
  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-border: rgba(255, 255, 255, 0.4);
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --transition: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

:root.dark {
  --bg-primary: #020617;
  --bg-secondary: #0f172a;
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --accent-primary: #38bdf8; /* Sky Blue */
  --accent-secondary: #fb923c; /* Sunset Orange */
  --accent-glow: rgba(56, 189, 248, 0.15);
  --card-bg: rgba(15, 23, 42, 0.8);
  --card-border: rgba(30, 41, 59, 0.8);
  --glass-bg: rgba(15, 23, 42, 0.4);
  --glass-border: rgba(255, 255, 255, 0.1);
  --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

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

html {
  scroll-behavior: smooth;
}

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

h1, h2, h3, .brand-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Header --- */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--glass-border);
  transition: all var(--transition);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 900;
  font-size: 20px;
}

.brand-title {
  font-size: 1.25rem;
  color: var(--text-primary);
}

.brand-title span {
  color: var(--accent-primary);
}

.main-nav ul {
  display: flex;
  gap: 32px;
  list-style: none;
}

.main-nav a {
  text-decoration: none;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.95rem;
  transition: color var(--transition);
  position: relative;
}

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

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

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

.header-actions {
  display: flex;
  gap: 16px;
  align-items: center;
}

.dark-toggle {
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  padding: 8px;
  border-radius: 10px;
  cursor: pointer;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.dark-toggle:hover {
  background: var(--accent-glow);
  border-color: var(--accent-primary);
}

/* --- Hero --- */
.hero {
  padding: 160px 0 100px;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  z-index: -1;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 60px;
  align-items: center;
}

.hero-copy h2 {
  font-size: 3.5rem;
  line-height: 1.1;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-primary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-copy p {
  font-size: 1.125rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 600px;
}

.hero-ctas {
  display: flex;
  gap: 16px;
}

.btn {
  padding: 14px 28px;
  border-radius: var(--radius-md);
  font-weight: 700;
  text-decoration: none;
  transition: all var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent-primary);
  color: white;
  box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.39);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.23);
}

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

.btn-outline:hover {
  background: var(--bg-secondary);
  border-color: var(--accent-primary);
}

.visual-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--glass-border);
}

.visual-card img {
  width: 100%;
  display: block;
}

/* --- Sections --- */
.section {
  padding: 100px 0;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-header h2 {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

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

/* --- Projects --- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 32px;
}

.project-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.project-card:hover {
  transform: translateY(-8px);
  border-color: var(--accent-primary);
  box-shadow: 0 20px 40px -12px var(--accent-glow);
}

.project-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: 20px;
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}

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

.project-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--accent-glow);
  color: var(--accent-primary);
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.project-card h3 {
  font-size: 1.5rem;
  margin-bottom: 12px;
}

.project-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 24px;
  flex-grow: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.tech-tag {
  font-size: 0.8rem;
  color: var(--text-secondary);
  background: var(--bg-secondary);
  padding: 4px 8px;
  border-radius: 4px;
}

/* --- Skills --- */
.skills-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}

.skill {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  padding: 12px 24px;
  border-radius: var(--radius-md);
  font-weight: 600;
  transition: all var(--transition);
}

.skill:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
  transform: scale(1.05);
}

/* --- Contact --- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 60px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
}

.contact-item .icon {
  width: 48px;
  height: 48px;
  background: var(--accent-glow);
  color: var(--accent-primary);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

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

.form-row {
  margin-bottom: 20px;
}

.form-row label {
  display: block;
  margin-bottom: 8px;
  font-weight: 600;
}

.form-control {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: inherit;
  transition: all var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 4px var(--accent-glow);
}

/* --- Footer --- */
.site-footer {
  padding: 80px 0 40px;
  border-top: 1px solid var(--card-border);
}

.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 60px;
}

.footer-col h4 {
  margin-bottom: 24px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 12px;
}

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

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

.social-links {
  display: flex;
  gap: 16px;
}

.social-links a {
  width: 40px;
  height: 40px;
  background: var(--bg-secondary);
  border: 1px solid var(--card-border);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition);
}

.social-links a:hover {
  background: var(--accent-primary);
  color: white;
  transform: translateY(-4px);
}

/* --- Mobile --- */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 24px;
  cursor: pointer;
}

@media (max-width: 992px) {
  .hero-inner, .contact-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .hero-copy p {
    margin-left: auto;
    margin-right: auto;
  }
  .hero-ctas {
    justify-content: center;
  }
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
  }
  .mobile-menu-btn {
    display: block;
  }
  .hero-copy h2 {
    font-size: 2.5rem;
  }
}

/* --- Animations --- */
.reveal-up {
  opacity: 0;
  transform: translateY(30px);
  transition: all 800ms cubic-bezier(0.23, 1, 0.32, 1);
}

.reveal-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.delay-sm { transition-delay: 100ms; }
.delay-md { transition-delay: 200ms; }
.delay-lg { transition-delay: 300ms; }

/* --- Preloader --- */
.preloader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--bg-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 600ms ease, visibility 600ms ease;
}

.preloader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.preloader-logo {
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 900;
  font-size: 36px;
  font-family: 'Outfit', sans-serif;
  animation: preloaderPulse 1.2s ease-in-out infinite;
}

@keyframes preloaderPulse {
  0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(37, 99, 235, 0.4); }
  50% { transform: scale(1.1); box-shadow: 0 0 0 20px rgba(37, 99, 235, 0); }
}

/* --- Typing Animation --- */
.typing-wrapper {
  display: inline-flex;
  align-items: center;
  min-height: 1.4em;
}

.typing-text {
  color: var(--accent-primary);
}

.typing-cursor {
  display: inline-block;
  width: 3px;
  height: 1em;
  background: var(--accent-primary);
  margin-left: 2px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

/* --- Floating Gradient Orbs --- */
.hero {
  position: relative;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.35;
  z-index: -1;
  animation: orbFloat 8s ease-in-out infinite alternate;
}

.orb-1 {
  width: 350px;
  height: 350px;
  background: var(--accent-primary);
  top: -80px;
  right: -60px;
}

.orb-2 {
  width: 280px;
  height: 280px;
  background: var(--accent-secondary);
  bottom: -60px;
  left: -40px;
  animation-delay: -3s;
  animation-duration: 10s;
}

.orb-3 {
  width: 200px;
  height: 200px;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  animation-delay: -5s;
  animation-duration: 12s;
}

@keyframes orbFloat {
  0% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -20px) scale(1.05); }
  66% { transform: translate(-20px, 15px) scale(0.95); }
  100% { transform: translate(15px, -10px) scale(1.02); }
}

/* --- Project Filters --- */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}

.filter-btn {
  padding: 10px 22px;
  border-radius: 50px;
  border: 1px solid var(--card-border);
  background: var(--card-bg);
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 0.9rem;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover {
  border-color: var(--accent-primary);
  color: var(--accent-primary);
}

.filter-btn.active {
  background: var(--accent-primary);
  color: white;
  border-color: var(--accent-primary);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.project-card {
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition), opacity 400ms ease;
}

.project-card.filter-hidden {
  display: none;
}

.project-card.filter-show {
  animation: filterIn 500ms ease forwards;
}

@keyframes filterIn {
  from { opacity: 0; transform: scale(0.92) translateY(16px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

/* --- Skill Bars --- */
.skills-categories {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 40px;
}

.skill-category {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: border-color var(--transition);
}

.skill-category:hover {
  border-color: var(--accent-primary);
}

.skill-category-title {
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.15rem;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.skill-category-title .cat-icon {
  font-size: 1.3rem;
}

.skill-bar-item {
  margin-bottom: 20px;
}

.skill-bar-item:last-child {
  margin-bottom: 0;
}

.skill-bar-label {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  font-weight: 600;
  font-size: 0.9rem;
}

.skill-bar-label span:last-child {
  color: var(--accent-primary);
  font-size: 0.85rem;
}

.skill-bar-track {
  width: 100%;
  height: 8px;
  background: var(--bg-secondary);
  border-radius: 99px;
  overflow: hidden;
}

.skill-bar-fill {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
  border-radius: 99px;
  transition: width 1.2s cubic-bezier(0.23, 1, 0.32, 1);
}

/* --- Stats Counter --- */
.stats-section {
  padding: 60px 0;
  background: var(--bg-secondary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px;
  text-align: center;
}

.stat-item {
  padding: 24px 16px;
}

.stat-number {
  font-family: 'Outfit', sans-serif;
  font-size: 3rem;
  font-weight: 800;
  color: var(--accent-primary);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
  font-weight: 600;
}

/* --- Back to Top --- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 900;
  width: 48px;
  height: 48px;
  background: var(--accent-primary);
  color: white;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.5);
}

/* --- Mobile Sidebar --- */
.mobile-sidebar {
  position: fixed;
  top: 0;
  right: 0;
  width: 280px;
  height: 100%;
  z-index: 2000;
  background: var(--bg-primary);
  border-left: 1px solid var(--card-border);
  padding: 80px 32px 32px;
  transform: translateX(100%);
  transition: transform 400ms cubic-bezier(0.4, 0, 0.2, 1);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mobile-sidebar.open {
  transform: translateX(0);
}

.mobile-sidebar a {
  display: block;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 1.05rem;
  transition: all var(--transition);
}

.mobile-sidebar a:hover,
.mobile-sidebar a.active {
  background: var(--accent-glow);
  color: var(--accent-primary);
}

.sidebar-close {
  position: absolute;
  top: 20px;
  right: 20px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 28px;
  cursor: pointer;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  transition: all var(--transition);
}

.sidebar-close:hover {
  background: var(--accent-glow);
  color: var(--accent-primary);
}

.sidebar-overlay {
  position: fixed;
  inset: 0;
  z-index: 1999;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: all 400ms ease;
}

.sidebar-overlay.open {
  opacity: 1;
  visibility: visible;
}

/* --- Active Nav (Scroll-Spy) --- */
.main-nav a.active::after {
  width: 100%;
}

/* --- Resume Download Button --- */
.btn-resume {
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  color: white;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.3);
}

.btn-resume:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.4);
}

/* --- Parallax Hero --- */
.hero-visual {
  will-change: transform;
}

/* --- Additional responsive --- */
@media (max-width: 768px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .skills-categories {
    grid-template-columns: 1fr;
  }
  .filter-bar {
    gap: 8px;
  }
  .filter-btn {
    padding: 8px 16px;
    font-size: 0.8rem;
  }
  .stat-number {
    font-size: 2.2rem;
  }
  .back-to-top {
    bottom: 20px;
    right: 20px;
    width: 42px;
    height: 42px;
  }
}