/* ============================================================
   Naresh Upadhyay — Senior Data Engineer Portfolio
   Modern Professional Theme
   ============================================================ */

/* ─── Variables ─────────────────────────────────────────── */
:root {
  --bg-primary:    #0a0f1e;
  --bg-secondary:  #0d1526;
  --bg-card:       #111827;
  --bg-card-hover: #1a2438;
  --accent:        #4facfe;
  --accent-2:      #00f2fe;
  --accent-glow:   rgba(79, 172, 254, 0.15);
  --accent-border: rgba(79, 172, 254, 0.25);
  --text-primary:  #f0f6ff;
  --text-secondary:#94a3b8;
  --text-muted:    #64748b;
  --green:         #10b981;
  --border:        rgba(255, 255, 255, 0.07);
  --font-sans:     'Inter', sans-serif;
  --font-heading:  'Poppins', sans-serif;
  --font-mono:     'Fira Code', monospace;
  --radius-sm:     6px;
  --radius:        12px;
  --radius-lg:     20px;
  --shadow:        0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-lg:     0 8px 48px rgba(0, 0, 0, 0.5);
  --transition:    0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--transition);
}
a:hover { color: var(--accent-2); }

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  line-height: 1.25;
}

ul { list-style: none; }

/* ─── Scrollbar ──────────────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(var(--accent), var(--accent-2));
  border-radius: 3px;
}

/* ─── Navigation ─────────────────────────────────────────── */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 1rem 0;
  background: transparent;
  transition: background var(--transition), padding var(--transition), box-shadow var(--transition);
}

#navbar.scrolled {
  background: rgba(10, 15, 30, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 0.6rem 0;
  box-shadow: 0 1px 0 var(--border);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}
.nav-logo span { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.nav-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}
.nav-links a:hover { color: var(--text-primary); background: rgba(255,255,255,0.05); }
.nav-links a.active { color: var(--accent); }

.nav-resume-btn {
  color: var(--accent) !important;
  border: 1px solid var(--accent-border) !important;
  background: var(--accent-glow) !important;
  border-radius: var(--radius-sm) !important;
  padding: 0.45rem 1rem !important;
  font-weight: 600 !important;
  transition: all var(--transition) !important;
}
.nav-resume-btn:hover {
  background: var(--accent) !important;
  color: var(--bg-primary) !important;
  border-color: var(--accent) !important;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
  display: block;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ─── Section Common ─────────────────────────────────────── */
.section {
  padding: 100px 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-glow);
  border: 1px solid var(--accent-border);
  border-radius: 100px;
  padding: 0.3rem 1rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.section-title {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 1rem;
}

.section-subtitle {
  color: var(--text-secondary);
  font-size: 1.05rem;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.8;
}

/* ─── Buttons ─────────────────────────────────────────────── */
.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--bg-primary);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(79, 172, 254, 0.3);
}
.btn-primary:hover {
  color: var(--bg-primary);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(79, 172, 254, 0.45);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  transition: all var(--transition);
}
.btn-outline:hover {
  color: var(--accent);
  border-color: var(--accent-border);
  background: var(--accent-glow);
}

/* ─── Hero ────────────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 6rem 2rem 4rem;
}

.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(79, 172, 254, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79, 172, 254, 0.04) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
}

.hero-bg-grid::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(79, 172, 254, 0.08) 0%, transparent 70%);
}

.hero-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 800px;
  z-index: 1;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--green);
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: 100px;
  padding: 0.35rem 1rem;
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.tag-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  animation: pulse-dot 2s infinite;
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
  50% { box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
}

.hero-name {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 800;
  letter-spacing: -1.5px;
  background: linear-gradient(135deg, #ffffff 0%, rgba(255,255,255,0.75) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.75rem;
  line-height: 1.1;
}

.hero-title {
  font-size: clamp(1.2rem, 3.5vw, 1.8rem);
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.title-prefix {
  color: var(--text-secondary);
  margin-right: 0.4rem;
}

.typed-text {
  color: var(--accent);
  font-weight: 600;
}

.cursor {
  color: var(--accent);
  animation: blink 1s step-end infinite;
  font-weight: 300;
}

@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 2.5rem;
  line-height: 1.8;
}
.hero-description strong { color: var(--text-primary); }

.hero-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
}

.hero-social {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
}

.hero-social a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 1.2rem;
  transition: all var(--transition);
}
.hero-social a:hover {
  color: var(--accent);
  border-color: var(--accent-border);
  background: var(--accent-glow);
  transform: translateY(-3px);
}

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  text-align: center;
}
.hero-scroll a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: color var(--transition);
  animation: bounce 2s infinite;
}
.hero-scroll a:hover { color: var(--accent); }
.hero-scroll i { font-size: 1.2rem; }

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* ─── Stats ───────────────────────────────────────────────── */
.stats {
  padding: 60px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  background: var(--bg-secondary);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-item {
  padding: 1.5rem;
}

.stat-number {
  font-family: var(--font-heading);
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.stat-plus {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ─── About ───────────────────────────────────────────────── */
.about {
  background: var(--bg-primary);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 5rem;
  align-items: center;
}

.about-image-wrap {
  position: relative;
}

.about-image-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 2px solid var(--accent-border);
  box-shadow: 0 0 40px rgba(79, 172, 254, 0.12);
  position: relative;
}

.about-image-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(10, 15, 30, 0.6) 100%);
  z-index: 1;
}

.about-photo {
  width: 100%;
  object-fit: cover;
}

.about-badge {
  position: absolute;
  bottom: -1.5rem;
  right: -1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: var(--shadow);
  z-index: 2;
}

.aws-badge img {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.aws-badge span {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.4;
}

.about-content h3 {
  font-size: 1.4rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-weight: 600;
}

.about-content p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.8;
}
.about-content p strong { color: var(--text-primary); }

.about-info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 1.75rem 0;
  padding: 1.5rem;
  background: var(--bg-card);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.info-item { display: flex; flex-direction: column; gap: 0.2rem; }
.info-label { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; }
.info-value { font-size: 0.9rem; color: var(--text-primary); font-weight: 500; }

.status-open {
  color: var(--green) !important;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.status-open::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green);
  display: inline-block;
  animation: pulse-dot 2s infinite;
}

.about-specialties {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.specialty-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.3rem 0.75rem;
  background: var(--accent-glow);
  border: 1px solid var(--accent-border);
  border-radius: 100px;
  color: var(--accent);
  font-weight: 500;
}

/* ─── Experience ─────────────────────────────────────────── */
.experience {
  background: var(--bg-secondary);
}

.exp-list {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

/* Card shell */
.exp-card {
  position: relative;
  display: grid;
  grid-template-columns: 240px 1fr;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.exp-card:hover {
  border-color: var(--accent-border);
  box-shadow: 0 12px 48px rgba(0, 0, 0, 0.35);
  transform: translateY(-3px);
}

/* Left colour accent strip */
.exp-card-accent {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--accent), var(--accent-2));
  border-radius: 4px 0 0 4px;
}

/* ── Left panel ── */
.exp-left {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
  padding: 2rem 1.5rem 2rem 2rem;
  border-right: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.015);
}

.exp-company-logo {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  box-shadow: 0 4px 16px rgba(79, 172, 254, 0.3);
}

.exp-logo-letter {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--bg-primary);
}

.exp-meta {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.exp-role {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
}

.exp-company {
  font-size: 0.88rem;
  color: var(--accent);
  font-weight: 600;
}
a.exp-company:hover { color: var(--accent-2); }

.exp-period,
.exp-location {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}
.exp-period i,
.exp-location i { font-size: 0.85rem; color: var(--text-muted); }

.exp-badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.7rem;
  border-radius: 100px;
  letter-spacing: 0.04em;
  margin-top: 0.25rem;
  width: fit-content;
}
.exp-badge.current {
  background: rgba(16, 185, 129, 0.12);
  color: var(--green);
  border: 1px solid rgba(16, 185, 129, 0.3);
}
.exp-badge.intern {
  background: rgba(139, 92, 246, 0.12);
  color: #a78bfa;
  border: 1px solid rgba(139, 92, 246, 0.25);
}

.exp-duration {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-top: 0.15rem;
}

/* ── Right panel ── */
.exp-right {
  padding: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* Impact chips row */
.exp-impacts {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.impact-chip {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  background: var(--accent-glow);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 1rem;
  min-width: 72px;
}

.impact-value {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.impact-label {
  font-size: 0.65rem;
  color: var(--text-muted);
  text-align: center;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
  white-space: nowrap;
}

/* Bullet points */
.exp-points {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.exp-points li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.exp-bullet {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
  margin-top: 0.55rem;
  box-shadow: 0 0 6px rgba(79, 172, 254, 0.5);
}

.exp-points strong { color: var(--text-primary); font-weight: 600; }

/* Tech stack pills */
.exp-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding-top: 0.25rem;
  border-top: 1px solid var(--border);
}

.exp-tech span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.25rem 0.65rem;
  background: rgba(79, 172, 254, 0.07);
  border: 1px solid rgba(79, 172, 254, 0.15);
  border-radius: var(--radius-sm);
  color: var(--accent);
  transition: background var(--transition), border-color var(--transition);
}
.exp-tech span:hover {
  background: rgba(79, 172, 254, 0.15);
  border-color: var(--accent);
}

/* ─── Skills ─────────────────────────────────────────────── */
.skills {
  background: var(--bg-primary);
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-bottom: 4rem;
}

.skill-category {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: border-color var(--transition), transform var(--transition);
}
.skill-category:hover {
  border-color: var(--accent-border);
  transform: translateY(-4px);
}

.skill-category-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.skill-category-header i {
  font-size: 1.3rem;
  color: var(--accent);
}

.skill-category-header h4 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.skill-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.skill-logo-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  min-width: 60px;
}

.skill-logo-item img {
  height: 36px;
  width: auto;
  max-width: 90px;
  object-fit: contain;
  filter: grayscale(20%) opacity(0.85);
  transition: filter var(--transition), transform var(--transition);
}
.skill-logo-item:hover img { filter: grayscale(0%) opacity(1); transform: scale(1.1); }

.skill-logo-item span {
  font-size: 0.68rem;
  color: var(--text-muted);
  text-align: center;
  font-weight: 500;
  white-space: nowrap;
}

/* Competency Bars */
.competencies {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.competencies-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.competencies-title::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.competency-bars {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.competency-item { display: flex; flex-direction: column; gap: 0.5rem; }

.competency-info {
  display: flex;
  justify-content: space-between;
  font-size: 0.85rem;
}
.competency-info span:first-child { color: var(--text-secondary); font-weight: 500; }
.competency-info span:last-child { color: var(--accent); font-family: var(--font-mono); font-size: 0.8rem; }

.competency-bar {
  height: 5px;
  background: rgba(255,255,255,0.06);
  border-radius: 100px;
  overflow: hidden;
}

.competency-fill {
  height: 100%;
  border-radius: 100px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  width: 0;
  transition: width 1.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Projects ────────────────────────────────────────────── */
.projects {
  background: var(--bg-secondary);
}

.project-filters {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 3rem;
}

.filter-btn {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 0.45rem 1.25rem;
  cursor: pointer;
  transition: all var(--transition);
}
.filter-btn:hover, .filter-btn.active {
  color: var(--accent);
  background: var(--accent-glow);
  border-color: var(--accent-border);
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}
.project-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
}
.project-card.hidden { display: none; }

.project-image {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
}

.project-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.project-card:hover .project-image img { transform: scale(1.06); }

.project-overlay {
  position: absolute;
  inset: 0;
  background: rgba(10, 15, 30, 0.85);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--transition);
}
.project-card:hover .project-overlay { opacity: 1; }

.project-detail-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent);
  color: var(--bg-primary);
  font-weight: 600;
  font-size: 0.85rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}
.project-detail-btn:hover {
  background: var(--accent-2);
  color: var(--bg-primary);
  transform: scale(1.05);
}

.project-info { padding: 1.25rem; }

.project-category-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 500;
}

.project-info h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0.4rem 0 0.5rem;
}

.project-info p {
  font-size: 0.83rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.project-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.project-tech span {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.15rem 0.55rem;
  background: rgba(79, 172, 254, 0.08);
  border: 1px solid rgba(79, 172, 254, 0.15);
  border-radius: 4px;
  color: var(--accent);
}

/* ─── Education ───────────────────────────────────────────── */
.education {
  background: var(--bg-primary);
}

.education-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.education-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.education-card:hover {
  border-color: var(--accent-border);
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.education-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
  border: 1px solid var(--accent-border);
}
.education-icon i { font-size: 1.5rem; color: var(--accent); }

.education-cert-img img {
  height: 52px;
  width: auto;
  object-fit: contain;
}

.edu-featured {
  border-color: var(--accent-border);
  background: linear-gradient(135deg, rgba(79,172,254,0.05) 0%, var(--bg-card) 60%);
  box-shadow: 0 0 30px rgba(79, 172, 254, 0.08);
}
.edu-featured h4 { color: var(--accent); }

.education-year {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: 500;
}

.education-content h4 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.2rem;
}

.education-content h5 {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.3rem;
}

.education-content p {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.education-subjects {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.75rem;
}

.education-subjects span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.2rem 0.6rem;
  background: rgba(79, 172, 254, 0.07);
  border: 1px solid rgba(79, 172, 254, 0.12);
  border-radius: 4px;
  color: var(--text-secondary);
}

/* ─── Contact ─────────────────────────────────────────────── */
.contact {
  background: var(--bg-secondary);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4rem;
  align-items: center;
}

.contact-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.contact-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--accent-glow);
  border: 1px solid var(--accent-border);
  flex-shrink: 0;
}
.contact-icon i { font-size: 1.2rem; color: var(--accent); }

.contact-item h5 {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.contact-item p {
  font-size: 0.92rem;
  color: var(--text-secondary);
}
.contact-item a { color: var(--text-secondary); }
.contact-item a:hover { color: var(--accent); }

.contact-social {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 2rem;
}

.social-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  transition: all var(--transition);
  width: fit-content;
}

.linkedin-btn:hover { color: #0077b5; border-color: #0077b5; background: rgba(0, 119, 181, 0.1); }
.github-btn:hover { color: #fff; border-color: #fff; background: rgba(255,255,255,0.05); }
.resume-btn:hover { color: var(--accent); border-color: var(--accent-border); background: var(--accent-glow); }

.cta-card {
  background: var(--bg-card);
  border: 1px solid var(--accent-border);
  border-radius: var(--radius-lg);
  padding: 3rem;
  text-align: center;
  box-shadow: 0 0 40px rgba(79, 172, 254, 0.08);
}

.cta-icon {
  font-size: 2.5rem;
  color: var(--accent);
  margin-bottom: 1.25rem;
  display: block;
}

.cta-card h3 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.cta-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 1.75rem;
}

/* ─── Contact Form ───────────────────────────────────────── */
.contact-form-wrap {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  position: relative;
}

.form-group label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.form-group input,
.form-group textarea {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 0.75rem 1rem;
  outline: none;
  transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
  width: 100%;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  background: rgba(79, 172, 254, 0.04);
  box-shadow: 0 0 0 3px rgba(79, 172, 254, 0.12);
}

.form-group input.invalid,
.form-group textarea.invalid {
  border-color: #f87171;
  box-shadow: 0 0 0 3px rgba(248, 113, 113, 0.1);
}

.form-group textarea {
  resize: vertical;
  min-height: 130px;
  line-height: 1.6;
}

.form-error {
  font-size: 0.75rem;
  color: #f87171;
  display: none;
}
.form-group.has-error .form-error { display: block; }

/* Status message */
.form-status {
  font-size: 0.875rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  display: none;
  align-items: center;
  gap: 0.5rem;
}
.form-status.success {
  display: flex;
  background: rgba(16, 185, 129, 0.12);
  border: 1px solid rgba(16, 185, 129, 0.3);
  color: #34d399;
}
.form-status.error {
  display: flex;
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.25);
  color: #f87171;
}

/* Submit button */
.form-submit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--bg-primary);
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.85rem 2rem;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  box-shadow: 0 4px 20px rgba(79, 172, 254, 0.3);
  align-self: flex-start;
}
.form-submit:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(79, 172, 254, 0.45);
}
.form-submit:disabled {
  opacity: 0.7;
  cursor: not-allowed;
  transform: none;
}

.submit-loading { display: none; }
.form-submit.loading .submit-text  { display: none; }
.form-submit.loading .submit-loading { display: flex; align-items: center; gap: 0.5rem; }

/* ─── Footer ─────────────────────────────────────────────── */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  background: var(--bg-primary);
}

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

.footer p {
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer strong { color: var(--text-secondary); }

.footer-social {
  display: flex;
  gap: 0.75rem;
}
.footer-social a {
  color: var(--text-muted);
  font-size: 1.1rem;
  transition: color var(--transition);
}
.footer-social a:hover { color: var(--accent); }

/* ─── Back to Top ────────────────────────────────────────── */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--bg-primary);
  border-radius: 50%;
  font-size: 1.2rem;
  box-shadow: 0 4px 16px rgba(79, 172, 254, 0.35);
  opacity: 0;
  pointer-events: none;
  transition: all var(--transition);
  z-index: 999;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}
.back-to-top:hover {
  color: var(--bg-primary);
  transform: translateY(-3px);
  box-shadow: 0 8px 24px rgba(79, 172, 254, 0.5);
}

/* ─── Fade-in on scroll ──────────────────────────────────── */
.fade-in-el {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in-el.fade-in-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Particle dots ──────────────────────────────────────── */
.particle {
  position: absolute;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0;
  animation: float-particle linear infinite;
  pointer-events: none;
}

@keyframes float-particle {
  0% { transform: translateY(100vh) scale(0); opacity: 0; }
  10% { opacity: 0.6; }
  90% { opacity: 0.2; }
  100% { transform: translateY(-10vh) scale(1); opacity: 0; }
}

/* ─── Responsive ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .education-grid { grid-template-columns: 1fr 1fr; }
  .competency-bars { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; gap: 3rem; }
  .about-image-wrap { max-width: 400px; margin: 0 auto; }
}

@media (max-width: 768px) {
  .section { padding: 72px 0; }

  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    height: 100vh;
    width: 280px;
    background: rgba(13, 21, 38, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    align-items: flex-start;
    padding: 5rem 2rem 2rem;
    gap: 0.25rem;
    transition: right 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    border-left: 1px solid var(--border);
    box-shadow: -20px 0 60px rgba(0,0,0,0.5);
  }
  .nav-links.open { right: 0; }
  .nav-links a { font-size: 1rem; padding: 0.75rem 1rem; width: 100%; }
  .nav-toggle { display: flex; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
  .skills-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
  .education-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .form-row { grid-template-columns: 1fr; }
  .footer .container { flex-direction: column; gap: 1rem; text-align: center; }
  .exp-card { grid-template-columns: 1fr; }
  .exp-left { border-right: none; border-bottom: 1px solid var(--border); flex-direction: row; flex-wrap: wrap; align-items: center; padding: 1.5rem; gap: 1rem; }
  .exp-meta { flex: 1; }
  .exp-right { padding: 1.5rem; }
}

@media (max-width: 480px) {
  .hero-name { font-size: 2.5rem; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stat-number { font-size: 2.2rem; }
  .project-filters { gap: 0.4rem; }
  .filter-btn { font-size: 0.78rem; padding: 0.35rem 0.9rem; }
  .cta-card { padding: 2rem 1.5rem; }
  .competencies { padding: 1.5rem; }
  .exp-left { flex-direction: column; align-items: flex-start; }
  .exp-impacts { gap: 0.5rem; }
  .impact-chip { min-width: 60px; padding: 0.4rem 0.75rem; }
}