@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600;700&display=swap');

:root {
  /* Light Theme */
  --primary-color: #e4e4e7;
  --accent-color: #a1a1aa;
  --highlight: #18181b;
  --bg-color: #fafafa;
  --bg-secondary: #f4f4f5;
  --text-color: #09090b;
  --text-secondary: #71717a;
  --text-tertiary: #a1a1aa;
  --border-color: #e4e4e7;
  --shadow: rgba(0, 0, 0, 0.04);
  --card-bg: #ffffff;
  --navbar-bg: rgba(250, 250, 250, 0.8);
  --code-bg: #f4f4f5;
  --hover-bg: rgba(0, 0, 0, 0.03);
  --accent-subtle: rgba(24, 24, 27, 0.06);
  --hero-glow-1: rgba(99, 102, 241, 0.12);
  --hero-glow-2: rgba(168, 85, 247, 0.08);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  /* Spacing */
  --section-padding: clamp(5rem, 10vw, 8rem) clamp(1.5rem, 5vw, 6rem);
  --container-max: 1100px;
}

[data-theme="dark"] {
  --primary-color: #27272a;
  --accent-color: #52525b;
  --highlight: #fafafa;
  --bg-color: #09090b;
  --bg-secondary: #18181b;
  --text-color: #fafafa;
  --text-secondary: #a1a1aa;
  --text-tertiary: #52525b;
  --border-color: #27272a;
  --shadow: rgba(0, 0, 0, 0.3);
  --card-bg: #18181b;
  --navbar-bg: rgba(9, 9, 11, 0.8);
  --code-bg: #18181b;
  --hover-bg: rgba(255, 255, 255, 0.03);
  --accent-subtle: rgba(250, 250, 250, 0.06);
  --hero-glow-1: rgba(99, 102, 241, 0.15);
  --hero-glow-2: rgba(168, 85, 247, 0.1);
}

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

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-color);
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
  font-size: 16px;
  line-height: 1.6;
  letter-spacing: -0.011em;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  letter-spacing: -0.03em;
  line-height: 1.15;
}

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

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

header {
  position: fixed;
  width: 100%;
  top: 0;
  z-index: 1000;
  background-color: var(--navbar-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 clamp(1.5rem, 5vw, 4rem);
  max-width: 1400px;
  margin: 0 auto;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  transition: opacity 0.2s ease;
}

.logo:hover {
  opacity: 0.7;
}

.logo-img {
  height: 32px;
  width: auto;
  object-fit: contain;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.navbar a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.875rem;
  transition: color 0.2s ease;
  position: relative;
}

.navbar a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1.5px;
  background: var(--text-color);
  transition: width 0.2s ease;
}

.navbar a:hover {
  color: var(--text-color);
}

.navbar a:hover::after {
  width: 100%;
}

/* Navigation Controls */
.nav-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle,
.lang-toggle {
  background: transparent;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
  color: var(--text-secondary);
}

.theme-toggle {
  width: 36px;
  height: 36px;
  font-size: 0.9rem;
}

.lang-toggle {
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
  font-family: var(--font-sans);
  gap: 0;
}

.theme-toggle:hover,
.lang-toggle:hover {
  background: var(--hover-bg);
  border-color: var(--text-tertiary);
  color: var(--text-color);
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 5px;
}

.hamburger span {
  width: 20px;
  height: 1.5px;
  background: var(--text-color);
  border-radius: 1px;
  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-section {
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--bg-color);
  color: var(--text-color);
  position: relative;
  overflow: hidden;
}

/* Grain texture overlay */
.hero-grain {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.03;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 128px 128px;
  pointer-events: none;
}

[data-theme="dark"] .hero-grain {
  opacity: 0.04;
}

/* Animated gradient orb behind hero content */
.hero-section::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 700px;
  height: 700px;
  background:
    radial-gradient(circle at 30% 40%, var(--hero-glow-1) 0%, transparent 50%),
    radial-gradient(circle at 70% 60%, var(--hero-glow-2) 0%, transparent 50%);
  z-index: 0;
  pointer-events: none;
  animation: heroOrb 8s ease-in-out infinite alternate;
  filter: blur(60px);
}

@keyframes heroOrb {
  0% {
    opacity: 0.6;
    transform: translate(-50%, -50%) scale(1) rotate(0deg);
  }
  33% {
    opacity: 0.8;
    transform: translate(-48%, -52%) scale(1.05) rotate(5deg);
  }
  66% {
    opacity: 0.7;
    transform: translate(-52%, -48%) scale(0.95) rotate(-3deg);
  }
  100% {
    opacity: 0.9;
    transform: translate(-50%, -50%) scale(1.08) rotate(2deg);
  }
}

/* Floating grid lines */
.hero-section::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.02;
  background-image:
    linear-gradient(var(--text-tertiary) 1px, transparent 1px),
    linear-gradient(90deg, var(--text-tertiary) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

[data-theme="dark"] .hero-section::after {
  opacity: 0.035;
}

.hero-content {
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  max-width: 700px;
  margin: 0 auto;
  padding: 0 2rem;
  position: relative;
}

/* Status badge */
.hero-status {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  border-radius: 100px;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  font-family: var(--font-mono);
  animation: heroFadeDown 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.1s both;
  letter-spacing: 0.01em;
}

.hero-status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
  animation: statusPulse 2s ease-in-out infinite;
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4); }
  50% { opacity: 0.8; box-shadow: 0 0 0 4px rgba(34, 197, 94, 0); }
}

@keyframes heroFadeDown {
  0% { opacity: 0; transform: translateY(-10px); }
  100% { opacity: 1; transform: translateY(0); }
}

.hero-memoji {
  flex-shrink: 0;
  animation: heroMemojiIn 1s cubic-bezier(0.16, 1, 0.3, 1) 0.3s both;
}

.memoji-avatar {
  width: 110px;
  height: 110px;
  border-radius: 50%;
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.08));
}

@keyframes heroMemojiIn {
  0% {
    opacity: 0;
    transform: scale(0.6) translateY(20px);
    filter: blur(8px) drop-shadow(0 4px 12px rgba(0, 0, 0, 0.08));
  }
  60% {
    transform: scale(1.05) translateY(-4px);
    filter: blur(0px) drop-shadow(0 4px 12px rgba(0, 0, 0, 0.08));
  }
  100% {
    opacity: 1;
    transform: scale(1) translateY(0);
    filter: blur(0px) drop-shadow(0 4px 12px rgba(0, 0, 0, 0.08));
  }
}

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

.hero-title {
  font-size: clamp(2.75rem, 7vw, 4.5rem);
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: var(--text-color);
  letter-spacing: -0.05em;
  line-height: 1.15;
  display: block;
  overflow: hidden;
  padding-bottom: 0.05em;
}

.hero-title-line {
  display: inline-block;
  animation: heroReveal 1s cubic-bezier(0.16, 1, 0.3, 1) 0.5s both;
  background: linear-gradient(135deg, var(--text-color) 0%, #6366f1 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

@keyframes heroReveal {
  0% {
    opacity: 0;
    clip-path: inset(0 100% 0 0);
    transform: translateY(8px);
  }
  100% {
    opacity: 1;
    clip-path: inset(0 0% 0 0);
    transform: translateY(0);
  }
}

.hero-cursor {
  display: inline-block;
  width: 3px;
  height: 0.8em;
  background: var(--text-color);
  margin-left: 6px;
  vertical-align: baseline;
  opacity: 0;
  animation: cursorFadeIn 0.01s 1.5s forwards, cursorBlink 1s step-end 1.5s infinite;
}

@keyframes cursorFadeIn {
  to { opacity: 1; }
}

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

.hero-role {
  font-size: clamp(0.85rem, 1.8vw, 1rem);
  color: var(--text-secondary);
  font-weight: 400;
  line-height: 1.6;
  max-width: 520px;
  margin: 0 auto;
  animation: heroFadeUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) 0.8s both;
}

.hero-desc {
  font-size: clamp(0.78rem, 1.4vw, 0.875rem);
  color: var(--text-tertiary);
  font-weight: 400;
  line-height: 1.5;
  max-width: 480px;
  margin: 0 auto;
  font-family: var(--font-mono);
  animation: heroFadeUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) 1s both;
}

@keyframes heroFadeUp {
  0% {
    opacity: 0;
    transform: translateY(16px);
    filter: blur(4px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
    filter: blur(0px);
  }
}

/* Hero social links */
.hero-links {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
  animation: heroFadeUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) 1.2s both;
}

.hero-social {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  font-size: 1rem;
  transition: all 0.2s ease;
}

.hero-social:hover {
  color: var(--text-color);
  border-color: var(--text-tertiary);
  background: var(--hover-bg);
  transform: translateY(-2px);
}

.hero-social::after {
  display: none;
}

/* Scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  animation: heroFadeUp 0.7s cubic-bezier(0.16, 1, 0.3, 1) 1.6s both;
}

.hero-scroll-line {
  width: 1px;
  height: 40px;
  background: var(--border-color);
  position: relative;
  overflow: hidden;
}

.hero-scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--text-secondary);
  animation: scrollLine 2s ease-in-out infinite;
}

@keyframes scrollLine {
  0% { top: -100%; }
  50% { top: 100%; }
  100% { top: 100%; }
}

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

.skills-section {
  padding: var(--section-padding);
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.skills-section h2 {
  text-align: center;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--text-color);
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.section-subtitle {
  text-align: center;
  color: var(--text-secondary);
  font-size: 1rem;
  margin-bottom: 3.5rem;
  font-weight: 400;
}

.skills-container {
  max-width: var(--container-max);
  margin: 0 auto;
  display: grid;
  gap: 1.5rem;
}

.skill-category {
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  transition: border-color 0.2s ease;
}

.skill-category:hover {
  border-color: var(--text-tertiary);
}

.skill-category h3 {
  color: var(--text-color);
  font-size: 1rem;
  margin-bottom: 1.25rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  letter-spacing: -0.01em;
}

.skill-category h3 i {
  font-size: 1.1rem;
  color: var(--text-secondary);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 0.75rem;
}

.skill-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1rem 0.75rem;
  background: var(--bg-secondary);
  border-radius: 10px;
  border: 1px solid transparent;
  cursor: default;
  transition: all 0.2s ease;
  position: relative;
}

.skill-item:hover {
  border-color: var(--border-color);
  background: var(--hover-bg);
}

.skill-logo {
  width: 2rem;
  height: 2rem;
  margin-bottom: 0.5rem;
  transition: transform 0.2s ease;
  object-fit: contain;
}

.skill-item:hover .skill-logo {
  transform: scale(1.1);
}

.skill-icon-fallback {
  font-size: 2rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
  transition: transform 0.2s ease;
}

.skill-item:hover .skill-icon-fallback {
  transform: scale(1.1);
}

.skill-item span {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-align: center;
}

.skill-item::before {
  content: attr(data-tooltip);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  background: var(--text-color);
  color: var(--bg-color);
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
  font-size: 0.75rem;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 10;
  font-weight: 500;
}

.skill-item:hover::before {
  opacity: 1;
}

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

.projects-section {
  padding: var(--section-padding);
  background-color: var(--bg-color);
  border-top: 1px solid var(--border-color);
  position: relative;
}

.projects-section h2 {
  text-align: center;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--text-color);
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.projects-section .section-subtitle {
  text-align: center;
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 3.5rem;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 1.5rem;
  max-width: var(--container-max);
  margin: 0 auto;
}

.project-card {
  background: var(--card-bg);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: var(--text-tertiary);
  box-shadow: 0 8px 32px var(--shadow);
}

.project-preview {
  width: 100%;
  height: 220px;
  overflow: hidden;
  position: relative;
  background: var(--bg-secondary);
}

.project-preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.project-card:hover .project-preview img {
  transform: scale(1.03);
}

.project-content {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  flex: 1;
}

.project-content h3 {
  font-size: 1.125rem;
  color: var(--text-color);
  font-weight: 600;
  letter-spacing: -0.02em;
}

.project-content p {
  color: var(--text-secondary);
  line-height: 1.6;
  font-size: 0.9rem;
  flex: 1;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.project-tech .tech-badge {
  background: var(--accent-subtle);
  color: var(--text-secondary);
  padding: 0.3rem 0.65rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 500;
  border: none;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  transition: all 0.2s ease;
  font-family: var(--font-mono);
}

.project-tech .tech-badge i {
  font-size: 0.7rem;
}

.project-tech .tech-badge:hover {
  background: var(--text-color);
  color: var(--bg-color);
}

.project-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.btn-demo,
.btn-github {
  flex: 1;
  padding: 0.65rem 1rem;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.85rem;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  transition: all 0.2s ease;
  border: 1px solid;
  font-family: var(--font-sans);
}

.btn-demo {
  background: var(--text-color);
  color: var(--bg-color);
  border-color: var(--text-color);
}

.btn-demo:hover {
  opacity: 0.85;
}

.btn-github {
  background: transparent;
  color: var(--text-color);
  border-color: var(--border-color);
}

.btn-github:hover {
  background: var(--hover-bg);
  border-color: var(--text-tertiary);
}

.btn-wip {
  flex: 1;
  padding: 0.65rem 1rem;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-family: var(--font-sans);
  background: transparent;
  color: var(--text-tertiary);
  border: 1px dashed var(--border-color);
  cursor: default;
}

.btn-demo i,
.btn-github i {
  font-size: 0.85rem;
}

.project-overlay h3 {
  font-size: 1.5rem;
  font-weight: 700;
}

.project-preview-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-subtle);
  color: var(--text-tertiary);
  font-size: 2.5rem;
}

/* Mini Projects */
.projects-mini {
  margin-top: 3rem;
  text-align: center;
}

.projects-mini h3 {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-tertiary);
  margin-bottom: 1.25rem;
  letter-spacing: -0.01em;
}

.mini-projects-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
}

.mini-project {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  padding: 1.25rem 0.75rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  text-decoration: none;
  transition: all 0.2s ease;
}

.mini-project:hover {
  border-color: var(--text-tertiary);
  background: var(--hover-bg);
}

.mini-project i {
  font-size: 1.25rem;
  color: var(--text-tertiary);
}

.mini-project span {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-color);
  font-family: var(--font-mono);
}

.mini-project small {
  font-size: 0.7rem;
  color: var(--text-tertiary);
  text-align: center;
  line-height: 1.3;
}

/* ============================================
   FUN FACTS SECTION
   ============================================ */

.funfacts-section {
  padding: 4rem 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  border-top: 1px solid var(--border-color);
}

.funfacts-section h2 {
  text-align: center;
  margin-bottom: 2rem;
}

.funfacts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.funfact-card {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1.25rem;
  border-radius: 10px;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  transition: all 0.2s ease;
}

.funfact-card:hover {
  border-color: var(--text-tertiary);
}

.funfact-emoji {
  font-size: 1.5rem;
  line-height: 1;
  flex-shrink: 0;
}

.funfact-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

/* ============================================
   CERTIFICATES SECTION
   ============================================ */

.section-note {
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-tertiary);
  margin-top: 0.5rem;
  font-family: var(--font-mono);
}

.section-note a {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
}

.section-note a:hover {
  color: var(--text-color);
}

.section-note a::after {
  display: none;
}

.certificates-section {
  padding: var(--section-padding);
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.certificates-section h2 {
  text-align: center;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--text-color);
  margin-bottom: 0.75rem;
  font-weight: 700;
}

.certificates-filters {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 0.5rem 1rem;
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  color: var(--text-secondary);
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-sans);
}

.filter-btn:hover {
  border-color: var(--text-tertiary);
  color: var(--text-color);
}

.filter-btn.active,
.filter-btn[data-filter="top4"].active,
.filter-btn[data-filter="ai"].active,
.filter-btn[data-filter="web"].active,
.filter-btn[data-filter="cloud"].active,
.filter-btn[data-filter="data"].active,
.filter-btn[data-filter="tools"].active,
.filter-btn[data-filter="all"].active {
  background: var(--text-color);
  color: var(--bg-color);
  border-color: var(--text-color);
}

/* Override individual filter hover colors to keep minimal */
.filter-btn[data-filter="top4"]:hover,
.filter-btn[data-filter="ai"]:hover,
.filter-btn[data-filter="web"]:hover,
.filter-btn[data-filter="cloud"]:hover,
.filter-btn[data-filter="data"]:hover,
.filter-btn[data-filter="tools"]:hover,
.filter-btn[data-filter="all"]:hover {
  border-color: var(--text-tertiary);
  color: var(--text-color);
  background: var(--card-bg);
}

.filter-btn[data-filter="top4"].active:hover,
.filter-btn[data-filter="ai"].active:hover,
.filter-btn[data-filter="web"].active:hover,
.filter-btn[data-filter="cloud"].active:hover,
.filter-btn[data-filter="data"].active:hover,
.filter-btn[data-filter="tools"].active:hover,
.filter-btn[data-filter="all"].active:hover {
  background: var(--text-color);
  color: var(--bg-color);
  border-color: var(--text-color);
}

.certificates-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  max-width: var(--container-max);
  margin: 0 auto;
}

.certificate-card {
  background: var(--card-bg);
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  transition: all 0.2s ease;
  cursor: pointer;
  min-height: auto;
}

.certificate-card:hover {
  border-color: var(--text-tertiary);
  box-shadow: 0 4px 16px var(--shadow);
}

.certificate-card.featured {
  border: 1px solid var(--border-color);
  background: var(--card-bg);
  position: relative;
}

.certificate-card.featured:hover {
  border-color: var(--text-tertiary);
}

.featured-badge {
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--text-color);
  color: var(--bg-color);
  padding: 0.3rem 0.7rem;
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 0.3rem;
  z-index: 10;
  box-shadow: none;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.featured-badge i {
  font-size: 0.7rem;
  animation: none;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.1); }
}

.certificate-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 300px;
  padding: 2rem;
  text-align: center;
  color: var(--text-secondary);
}

.certificate-placeholder i {
  font-size: 3rem;
  color: var(--text-tertiary);
  margin-bottom: 1rem;
}

.certificate-placeholder p {
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--text-color);
}

.certificate-placeholder small {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.certificate-image {
  position: relative;
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: var(--bg-secondary);
}

.certificate-image img,
.certificate-image embed,
.certificate-image object {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
  pointer-events: none;
}

.certificate-card:hover .certificate-image img,
.certificate-card:hover .certificate-image embed,
.certificate-card:hover .certificate-image object {
  transform: scale(1.03);
}

.certificate-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(9, 9, 11, 0.6);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  opacity: 0;
  transition: opacity 0.2s ease;
  color: white;
}

.certificate-card:hover .certificate-overlay {
  opacity: 1;
}

.certificate-overlay i {
  font-size: 1.5rem;
}

.certificate-overlay span {
  font-size: 0.85rem;
  font-weight: 500;
}

.certificate-info {
  padding: 1.25rem;
}

.certificate-info h3 {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-color);
  margin-bottom: 0.5rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.certificate-issuer,
.certificate-date {
  font-size: 0.8rem;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.certificate-issuer i,
.certificate-date i {
  color: var(--text-tertiary);
  font-size: 0.75rem;
}

.certificate-link {
  text-decoration: none;
  color: inherit;
  display: block;
  height: 100%;
}

.certificate-link:hover .certificate-info h3 {
  color: var(--text-secondary);
}

.certificate-badge {
  margin-top: 0.5rem;
  padding: 0.35rem 0.6rem;
  background: var(--accent-subtle);
  border-radius: 6px;
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.certificate-badge i {
  font-size: 0.8rem;
}

/* Category Badges - minimal style */
.certificate-category-badge {
  display: inline-block;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  font-size: 0.7rem;
  font-weight: 500;
  margin-top: 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
}

.ai-badge,
.web-badge,
.cloud-badge,
.data-badge,
.tools-badge {
  background: var(--accent-subtle);
  color: var(--text-secondary);
  border: none;
}

/* Lightbox Modal */
.lightbox {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(9, 9, 11, 0.92);
  z-index: 10000;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  backdrop-filter: blur(8px);
}

.lightbox.active {
  display: flex;
}

.lightbox-content {
  max-width: 90%;
  max-height: 90%;
  position: relative;
}

.lightbox-content img,
.lightbox-content iframe {
  max-width: 100%;
  max-height: 85vh;
  border-radius: 8px;
}

.lightbox-close {
  position: absolute;
  top: -40px;
  right: 0;
  background: var(--text-color);
  color: var(--bg-color);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s ease;
}

.lightbox-close:hover {
  opacity: 0.8;
}

/* ============================================
   EXPERIENCE SECTION
   ============================================ */

.experience-section {
  padding: var(--section-padding);
  background-color: var(--bg-color);
  border-top: 1px solid var(--border-color);
}

.experience-section h2 {
  text-align: center;
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  color: var(--text-color);
  margin-bottom: 3.5rem;
  font-weight: 700;
}

.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
}

.timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 1px;
  height: 100%;
  background: var(--border-color);
}

.timeline-item {
  width: 100%;
  padding: 0;
  position: relative;
  padding-left: 2.5rem;
  margin-bottom: 2rem;
}

.timeline-item:nth-child(odd) {
  left: 0;
  text-align: left;
}

.timeline-item:nth-child(even) {
  left: 0;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -4px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--text-color);
  border: 2px solid var(--bg-color);
}

.timeline-content {
  background: var(--card-bg);
  padding: 1.5rem;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  transition: border-color 0.2s ease;
  box-shadow: none;
}

.timeline-content:hover {
  border-color: var(--text-tertiary);
}

.timeline-content h3 {
  color: var(--text-color);
  margin-bottom: 0.5rem;
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.timeline-content p {
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
  font-size: 0.9rem;
  line-height: 1.6;
}

.timeline-date {
  color: var(--text-tertiary);
  font-weight: 500;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

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

.contact-section {
  padding: 0;
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
}

.contact-container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 80vh;
  max-width: 1400px;
  margin: 0 auto;
}

.contact-info {
  background: transparent;
  color: var(--text-color);
  padding: 5rem clamp(2rem, 5vw, 4rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.contact-info h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 0.75rem;
  font-weight: 700;
  color: var(--text-color);
  letter-spacing: -0.03em;
}

.contact-subtitle {
  font-size: 1rem;
  margin-bottom: 3rem;
  color: var(--text-secondary);
  line-height: 1.6;
  text-align: left;
}

.contact-details h3 {
  font-size: 0.8rem;
  margin-bottom: 1.25rem;
  color: var(--text-tertiary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.contact-details > p {
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 2.5rem;
  color: var(--text-secondary);
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.contact-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-subtle);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.contact-icon i {
  font-size: 1rem;
  color: var(--text-secondary);
}

.contact-item h4 {
  font-size: 0.7rem;
  margin-bottom: 0.15rem;
  font-weight: 500;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.contact-item p,
.contact-item a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-color);
  margin: 0;
  transition: color 0.2s ease;
}

.contact-item a:hover {
  color: var(--text-secondary);
}

.contact-form-wrapper {
  background: var(--bg-color);
  padding: 5rem clamp(2rem, 5vw, 4rem);
  display: flex;
  align-items: center;
  justify-content: center;
  border-left: 1px solid var(--border-color);
}

.contact-form {
  width: 100%;
  max-width: 460px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 0.4rem;
}

.required {
  color: var(--text-tertiary);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  background: var(--bg-secondary);
  color: var(--text-color);
  transition: all 0.2s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--text-tertiary);
  box-shadow: 0 0 0 3px var(--accent-subtle);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-group small {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  line-height: 1.4;
}

.btn-submit {
  width: 100%;
  padding: 0.8rem 1.5rem;
  background: var(--text-color);
  color: var(--bg-color);
  border: none;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  font-family: var(--font-sans);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  transition: opacity 0.2s ease;
  margin-top: 0.5rem;
}

.btn-submit:hover {
  opacity: 0.85;
}

.btn-submit i {
  font-size: 0.9rem;
}

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

footer {
  background: var(--bg-color);
  color: var(--text-tertiary);
  text-align: center;
  padding: 2rem;
  font-weight: 400;
  font-size: 0.85rem;
  border-top: 1px solid var(--border-color);
}

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

.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}

.animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

@media (max-width: 1024px) {
  .navbar {
    padding: 0 1.5rem;
  }

  .nav-menu {
    gap: 1.5rem;
  }

  .timeline::before {
    left: 0;
  }

  .timeline-item {
    width: 100%;
    padding-left: 2.5rem !important;
    text-align: left !important;
    left: 0 !important;
  }

  .timeline-item:nth-child(even) {
    padding-right: 0;
  }

  .timeline-item::before {
    left: -4px;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 0 1.25rem;
  }

  .nav-menu {
    position: fixed;
    left: -100%;
    top: 64px;
    flex-direction: column;
    background-color: var(--navbar-bg);
    backdrop-filter: blur(12px);
    width: 100%;
    text-align: center;
    transition: left 0.3s ease;
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem 0;
    gap: 0;
  }

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

  .nav-menu li {
    padding: 0.75rem 0;
  }

  .hamburger {
    display: flex;
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .hero-content p {
    font-size: 1rem;
  }

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

  .mini-projects-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .contact-container {
    grid-template-columns: 1fr;
  }

  .contact-info {
    padding: 3rem 1.5rem;
  }

  .contact-form-wrapper {
    padding: 3rem 1.5rem;
    border-left: none;
    border-top: 1px solid var(--border-color);
  }

  .form-row {
    grid-template-columns: 1fr;
  }

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

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

  .memoji-avatar {
    width: 100px;
    height: 100px;
  }

  .skills-grid {
    grid-template-columns: repeat(auto-fill, minmax(80px, 1fr));
    gap: 0.5rem;
  }

  .skill-category {
    padding: 1.25rem;
  }

  .skill-item {
    padding: 0.75rem 0.5rem;
  }

  .skill-item span {
    font-size: 0.7rem;
  }

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

  .certificates-filters {
    gap: 0.35rem;
  }

  .filter-btn {
    padding: 0.4rem 0.75rem;
    font-size: 0.75rem;
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: 0 1rem;
  }

  .logo-img {
    height: 28px;
  }

  .theme-toggle {
    width: 32px;
    height: 32px;
    font-size: 0.8rem;
  }

  .memoji-avatar {
    width: 90px;
    height: 90px;
  }

  .skills-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .skill-category h3 {
    font-size: 0.9rem;
  }

  .timeline-item {
    padding-left: 2rem !important;
  }

  .timeline::before {
    left: 0;
  }

  .timeline-item::before {
    left: -4px;
  }
}

/* ============================================
   SCROLLBAR (subtle)
   ============================================ */

::-webkit-scrollbar {
  width: 6px;
}

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

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text-tertiary);
}

/* ============================================
   SELECTION
   ============================================ */

::selection {
  background: var(--text-color);
  color: var(--bg-color);
}