/* ============================================
   ANKUR TIWARI — PORTFOLIO STYLES
   Futuristic AI Theme | Dark/Light Toggle
   ============================================ */

/* ---------- IMPORTS ---------- */
@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@300;400;500;600;700&family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ---------- CSS CUSTOM PROPERTIES ---------- */
:root {
  /* Dark theme (default) */
  --bg-primary: #050510;
  --bg-secondary: #0c0c1d;
  --bg-card: rgba(15, 15, 35, 0.7);
  --bg-card-solid: #0f0f23;
  --bg-nav: rgba(5, 5, 16, 0.85);
  --text-primary: #e8e8f0;
  --text-secondary: #9090a8;
  --text-muted: #606078;
  --accent: #00c8ff;
  --accent-secondary: #0066ff;
  --accent-purple: #7b2fff;
  --accent-glow: rgba(0, 200, 255, 0.15);
  --accent-gradient: linear-gradient(135deg, #00c8ff, #0066ff, #7b2fff);
  --border-color: rgba(255, 255, 255, 0.06);
  --border-glow: rgba(0, 200, 255, 0.2);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 30px rgba(0, 200, 255, 0.1);
  --grid-color: rgba(0, 200, 255, 0.03);
  --code-bg: rgba(0, 200, 255, 0.06);
  --toggle-bg: rgba(255, 255, 255, 0.08);
  --section-divider: linear-gradient(90deg, transparent, rgba(0,200,255,0.2), transparent);
}

[data-theme="light"] {
  --bg-primary: #f0f2f5;
  --bg-secondary: #e8eaef;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-solid: #ffffff;
  --bg-nav: rgba(240, 242, 245, 0.9);
  --text-primary: #1a1a2e;
  --text-secondary: #555570;
  --text-muted: #8888a0;
  --accent: #0055cc;
  --accent-secondary: #0044aa;
  --accent-purple: #5a1fcc;
  --accent-glow: rgba(0, 85, 204, 0.1);
  --accent-gradient: linear-gradient(135deg, #0066ff, #0044aa, #5a1fcc);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-glow: rgba(0, 85, 204, 0.15);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 30px rgba(0, 85, 204, 0.06);
  --grid-color: rgba(0, 85, 204, 0.03);
  --code-bg: rgba(0, 85, 204, 0.05);
  --toggle-bg: rgba(0, 0, 0, 0.06);
  --section-divider: linear-gradient(90deg, transparent, rgba(0,85,204,0.15), transparent);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
  font-size: 16px;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  transition: background 0.5s ease, color 0.4s ease;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Selection styling */
::selection {
  background: var(--accent);
  color: #fff;
}

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

/* ---------- GRID BACKGROUND ---------- */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image:
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

/* ---------- CURSOR GLOW ---------- */
.cursor-glow {
  position: fixed;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow), transparent 70%);
  pointer-events: none;
  z-index: 1;
  transform: translate(-50%, -50%);
  transition: opacity 0.3s ease;
  opacity: 0;
  will-change: left, top;
}
.cursor-glow.active {
  opacity: 1;
}

/* ---------- TYPOGRAPHY ---------- */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 600;
  line-height: 1.2;
}

.section-label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 10px;
}
.section-label::before {
  content: '//';
  opacity: 0.5;
}

.section-title {
  font-size: clamp(2rem, 4vw, 2.8rem);
  margin-bottom: 1.25rem;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.7;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.3s ease;
}
a:hover {
  color: var(--accent-secondary);
}

/* ---------- LAYOUT ---------- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

section {
  position: relative;
  padding: 100px 0;
  z-index: 2;
}

.section-divider {
  width: 100%;
  height: 1px;
  background: var(--section-divider);
  border: none;
  margin: 0;
}

/* ---------- NAVBAR ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 20px 0;
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(0px);
}
.navbar.scrolled {
  padding: 12px 0;
  background: var(--bg-nav);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-color);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  transition: color 0.3s;
}
.nav-logo span {
  color: var(--accent);
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}
.nav-links a {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.5px;
  position: relative;
  padding: 4px 0;
  transition: color 0.3s ease;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 1px;
  transition: width 0.3s ease;
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--accent);
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Theme toggle */
.theme-toggle {
  background: var(--toggle-bg);
  border: 1px solid var(--border-color);
  border-radius: 50px;
  padding: 8px 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 1rem;
  color: var(--text-primary);
  transition: all 0.3s ease;
}
.theme-toggle:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-glow);
}
.theme-toggle svg {
  width: 18px;
  height: 18px;
  transition: transform 0.4s ease;
}
.theme-toggle:hover svg {
  transform: rotate(30deg);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
  z-index: 1001;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s ease;
}
.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ---------- HERO SECTION ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 120px 0 80px;
}

#particleCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

/* Floating orbs */
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.3;
  z-index: 0;
  animation: orbFloat 8s ease-in-out infinite;
}
.hero-orb--1 {
  width: 400px;
  height: 400px;
  background: var(--accent);
  top: 10%;
  right: -10%;
  animation-delay: 0s;
}
.hero-orb--2 {
  width: 300px;
  height: 300px;
  background: var(--accent-purple);
  bottom: 10%;
  left: -5%;
  animation-delay: -3s;
}
.hero-orb--3 {
  width: 200px;
  height: 200px;
  background: var(--accent-secondary);
  top: 50%;
  left: 40%;
  animation-delay: -5s;
}

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

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
}

.hero-greeting {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: 16px;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 0.3s;
}
.hero-greeting .wave {
  display: inline-block;
  animation: wave 2s ease-in-out infinite;
  transform-origin: 70% 70%;
}

@keyframes wave {
  0%, 60%, 100% { transform: rotate(0deg); }
  10% { transform: rotate(14deg); }
  20% { transform: rotate(-8deg); }
  30% { transform: rotate(14deg); }
  40% { transform: rotate(-4deg); }
  50% { transform: rotate(10deg); }
}

.hero-name {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 700;
  letter-spacing: -2px;
  margin-bottom: 16px;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 0.5s;
}
.hero-name .gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-title-wrapper {
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 0.7s;
}
.hero-title {
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(0.95rem, 2vw, 1.2rem);
  color: var(--text-secondary);
}
.hero-title .typed-cursor {
  display: inline-block;
  width: 2px;
  height: 1.2em;
  background: var(--accent);
  margin-left: 4px;
  vertical-align: middle;
  animation: blink 1s step-end infinite;
}

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

.hero-description {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 580px;
  margin: 0 auto 36px;
  line-height: 1.8;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 0.9s;
}

.hero-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 1.1s;
}

/* Buttons */
.btn {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 0.95rem;
  font-weight: 500;
  padding: 14px 32px;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  letter-spacing: 0.3px;
  text-decoration: none;
}
.btn svg {
  width: 18px;
  height: 18px;
  transition: transform 0.3s ease;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 20px rgba(0, 200, 255, 0.25);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 200, 255, 0.35);
  color: #fff;
}
.btn-primary:hover svg {
  transform: translateX(3px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border-glow);
  backdrop-filter: blur(8px);
}
.btn-outline:hover {
  border-color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
  color: var(--text-primary);
}

/* Hero social */
.hero-social {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 40px;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 1.3s;
}
.hero-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all 0.3s ease;
  background: var(--bg-card);
  backdrop-filter: blur(8px);
}
.hero-social a:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}
.hero-social a svg {
  width: 20px;
  height: 20px;
}

/* Scroll indicator */
.scroll-indicator {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  z-index: 2;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
  animation-delay: 1.5s;
}
.scroll-indicator span {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.7rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text-muted);
}
.scroll-indicator .mouse {
  width: 24px;
  height: 38px;
  border: 2px solid var(--text-muted);
  border-radius: 12px;
  position: relative;
}
.scroll-indicator .mouse::before {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 3px;
  height: 8px;
  background: var(--accent);
  border-radius: 2px;
  animation: scrollMouse 2s ease-in-out infinite;
}

@keyframes scrollMouse {
  0%, 100% { top: 8px; opacity: 1; }
  50% { top: 18px; opacity: 0.3; }
}

/* ---------- ABOUT SECTION ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 1.02rem;
  margin-bottom: 20px;
  line-height: 1.8;
}
.about-text p strong {
  color: var(--text-primary);
  font-weight: 600;
}

.about-highlight {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 2px 10px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--accent);
  white-space: nowrap;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 28px 24px;
  text-align: center;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.stat-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--accent-gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.stat-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.stat-card:hover::before {
  opacity: 1;
}
.stat-number {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 8px;
}
.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ---------- SKILLS SECTION ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 28px;
  backdrop-filter: blur(10px);
  transition: all 0.35s ease;
  position: relative;
  overflow: hidden;
}
.skill-category::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 0 4px 4px 0;
  opacity: 0;
  transition: opacity 0.3s ease;
}
.skill-category:hover {
  border-color: var(--border-glow);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}
.skill-category:hover::before {
  opacity: 1;
}
.skill-category-icon {
  font-size: 1.6rem;
  margin-bottom: 12px;
}
.skill-category-title {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.skill-tag {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  padding: 5px 12px;
  border-radius: 20px;
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  transition: all 0.3s ease;
  cursor: default;
}
.skill-tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
  transform: translateY(-1px);
}

/* ---------- PROJECTS SECTION ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 40px;
  backdrop-filter: blur(10px);
  transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  transform-style: preserve-3d;
  perspective: 1000px;
}
.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s ease;
}
.project-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}
.project-card:hover::before {
  transform: scaleX(1);
}

.project-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 20px;
}
.project-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: var(--accent-glow);
  border: 1px solid var(--border-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
}
.project-links {
  display: flex;
  gap: 10px;
}
.project-link {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all 0.3s ease;
  background: transparent;
}
.project-link:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}
.project-link svg {
  width: 18px;
  height: 18px;
}

.project-name {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
}
.project-subtitle {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: var(--accent);
  margin-bottom: 16px;
}
.project-description {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 20px;
  line-height: 1.7;
}

.project-features {
  list-style: none;
  margin-bottom: 24px;
}
.project-features li {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding: 6px 0;
  padding-left: 24px;
  position: relative;
  line-height: 1.6;
}
.project-features li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.project-tech span {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.75rem;
  padding: 4px 12px;
  border-radius: 20px;
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  color: var(--accent);
}

/* ---------- EDUCATION SECTION ---------- */
.education-timeline {
  position: relative;
  padding-left: 40px;
}
.education-timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent), var(--accent-purple));
  border-radius: 1px;
}

.timeline-item {
  position: relative;
  padding-bottom: 40px;
}
.timeline-item:last-child {
  padding-bottom: 0;
}
.timeline-dot {
  position: absolute;
  left: -34px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--bg-primary);
  border: 3px solid var(--accent);
  z-index: 2;
  transition: all 0.3s ease;
}
.timeline-item:hover .timeline-dot {
  background: var(--accent);
  box-shadow: 0 0 15px rgba(0, 200, 255, 0.4);
}

.timeline-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 28px;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
}
.timeline-card:hover {
  border-color: var(--border-glow);
  transform: translateX(6px);
  box-shadow: var(--shadow-glow);
}
.timeline-date {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--accent);
  margin-bottom: 8px;
}
.timeline-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.timeline-institution {
  font-size: 0.95rem;
  color: var(--text-secondary);
  margin-bottom: 4px;
}
.timeline-detail {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.timeline-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 10px;
  padding: 4px 12px;
  border-radius: 20px;
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  color: var(--accent);
}

/* ---------- COMPETITIVE PROGRAMMING ---------- */
.cp-content {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 40px;
  align-items: start;
}
.cp-stats-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 36px;
  backdrop-filter: blur(10px);
  text-align: center;
  transition: all 0.3s ease;
}
.cp-stats-card:hover {
  border-color: var(--border-glow);
  box-shadow: var(--shadow-glow);
}
.cp-platform {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  color: var(--accent);
  margin-bottom: 8px;
}
.cp-total {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 4px;
}
.cp-total-label {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 20px;
}
.cp-langs {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}
.cp-lang {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.78rem;
  padding: 4px 12px;
  border-radius: 20px;
  background: var(--code-bg);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.cp-topics {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.cp-topic {
  display: grid;
  grid-template-columns: 140px 1fr 40px;
  align-items: center;
  gap: 16px;
}
.cp-topic-name {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.82rem;
  color: var(--text-secondary);
  text-align: right;
}
.cp-topic-bar {
  height: 8px;
  background: var(--code-bg);
  border-radius: 4px;
  overflow: hidden;
  position: relative;
}
.cp-topic-fill {
  height: 100%;
  background: var(--accent-gradient);
  border-radius: 4px;
  width: 0;
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}
.cp-topic-count {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--accent);
  text-align: right;
}

/* ---------- ACHIEVEMENTS SECTION ---------- */
.achievements-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.achievement-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 28px;
  backdrop-filter: blur(10px);
  text-align: center;
  transition: all 0.35s ease;
}
.achievement-card:hover {
  border-color: var(--border-glow);
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
}
.achievement-icon {
  font-size: 2.2rem;
  margin-bottom: 14px;
}
.achievement-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-primary);
}
.achievement-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---------- CONTACT SECTION ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  max-width: 600px;
  margin: 0 auto;
  gap: 48px;
  align-items: start;
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.contact-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 20px 24px;
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  text-decoration: none;
}
.contact-card:hover {
  border-color: var(--border-glow);
  transform: translateX(6px);
  box-shadow: var(--shadow-glow);
}
.contact-card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent-glow);
  border: 1px solid var(--border-glow);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}
.contact-card-icon svg {
  width: 22px;
  height: 22px;
}
.contact-card-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 2px;
  font-family: 'JetBrains Mono', monospace;
}
.contact-card-value {
  font-size: 0.95rem;
  color: var(--text-primary);
  font-weight: 500;
}

/* Contact form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.form-group label {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.8rem;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}
.form-group input,
.form-group textarea {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 14px 18px;
  font-family: 'Inter', sans-serif;
  font-size: 0.95rem;
  color: var(--text-primary);
  transition: all 0.3s ease;
  outline: none;
  resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}
.form-group textarea {
  min-height: 120px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

/* ---------- FOOTER ---------- */
.footer {
  position: relative;
  z-index: 2;
  border-top: 1px solid var(--border-color);
  padding: 40px 0;
}
.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}
.footer-text {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer-text span {
  color: var(--accent);
}
.footer-links {
  display: flex;
  gap: 20px;
}
.footer-links a {
  color: var(--text-secondary);
  font-size: 0.85rem;
  transition: color 0.3s ease;
}
.footer-links a:hover {
  color: var(--accent);
}

/* ---------- REVEAL ANIMATION ---------- */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}
.reveal.active {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal-stagger.active > * {
  opacity: 1;
  transform: translateY(0);
}
.reveal-stagger.active > *:nth-child(1) { transition-delay: 0.05s; }
.reveal-stagger.active > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger.active > *:nth-child(3) { transition-delay: 0.15s; }
.reveal-stagger.active > *:nth-child(4) { transition-delay: 0.2s; }
.reveal-stagger.active > *:nth-child(5) { transition-delay: 0.25s; }
.reveal-stagger.active > *:nth-child(6) { transition-delay: 0.3s; }
.reveal-stagger.active > *:nth-child(7) { transition-delay: 0.35s; }
.reveal-stagger.active > *:nth-child(8) { transition-delay: 0.4s; }

/* ---------- KEYFRAME ANIMATIONS ---------- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ---------- BACK TO TOP ---------- */
.back-to-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
}
.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}
.back-to-top svg {
  width: 20px;
  height: 20px;
}

/* ---------- MOBILE NAV OVERLAY ---------- */
.nav-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(5, 5, 16, 0.95);
  backdrop-filter: blur(20px);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s ease;
}
.nav-overlay.active {
  opacity: 1;
  visibility: visible;
}
.nav-overlay .nav-links {
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 28px;
}
.nav-overlay .nav-links a {
  font-size: 1.3rem;
}

/* ---------- REDUCED MOTION ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .reveal-stagger > * { opacity: 1; transform: none; }
}

/* ---------- RESPONSIVE ---------- */
@media (max-width: 1024px) {
  .skills-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .cp-content {
    grid-template-columns: 1fr;
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  html { font-size: 15px; }
  
  section { padding: 70px 0; }
  
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-overlay { display: block; }
  
  .hero { padding: 100px 0 60px; }
  .hero-name { letter-spacing: -1px; }
  
  .skills-grid {
    grid-template-columns: 1fr;
  }
  .achievements-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .about-stats {
    grid-template-columns: 1fr 1fr;
  }
  .project-card { padding: 28px; }
  
  .cp-topic {
    grid-template-columns: 100px 1fr 30px;
    gap: 10px;
  }
  
  .cursor-glow { display: none; }
  
  .footer-content {
    flex-direction: column;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  
  .hero-cta { flex-direction: column; }
  .btn { width: 100%; justify-content: center; }
  
  .about-stats {
    grid-template-columns: 1fr;
  }
  .stat-card { padding: 20px; }
  
  .hero-social { gap: 10px; }
  
  .cp-topic {
    grid-template-columns: 80px 1fr 28px;
    gap: 8px;
  }
  .cp-topic-name {
    font-size: 0.72rem;
  }
}