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

:root {
  --bg:            #09090f;
  --bg-alt:        #0e0e17;
  --surface:       #111120;
  --card:          #16162a;
  --border:        #1f1f38;
  --border-hover:  #2e2e54;
  --accent:        #6366f1;
  --accent-light:  #818cf8;
  --accent-dim:    rgba(99, 102, 241, 0.12);
  --accent-glow:   rgba(99, 102, 241, 0.25);
  --cyan:          #06b6d4;
  --green:         #22c55e;
  --text-primary:  #f1f5f9;
  --text-secondary:#94a3b8;
  --text-muted:    #4b5880;
  --font-heading:  'Space Grotesk', sans-serif;
  --font-body:     'Inter', sans-serif;
  --radius:        14px;
  --radius-sm:     8px;
  --radius-xs:     6px;
  --ease:          cubic-bezier(0.16, 1, 0.3, 1);
  --duration:      0.28s;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  font-size: 16px;
}

body {
  background-color: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* =============================================
   TYPOGRAPHY
   ============================================= */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  line-height: 1.15;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

h2 { font-size: clamp(1.9rem, 4vw, 2.8rem); }
h3 { font-size: 1.2rem; font-weight: 600; }
h4 { font-size: 0.95rem; font-weight: 500; color: var(--text-secondary); }

p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  line-height: 1.75;
}
p:last-child { margin-bottom: 0; }

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

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

ul { list-style: none; }

/* =============================================
   LAYOUT
   ============================================= */
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 28px;
}

.section {
  padding: 108px 0;
}

.section-alt {
  background-color: var(--bg-alt);
}

.section-header {
  text-align: center;
  max-width: 580px;
  margin: 0 auto 72px;
}

.section-header p { font-size: 1.05rem; }

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 14px;
}

/* =============================================
   BUTTONS
   ============================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 30px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--duration) var(--ease);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 28px rgba(99, 102, 241, 0.28);
}

.btn-primary:hover {
  background: var(--accent-light);
  color: #fff;
  box-shadow: 0 0 44px rgba(99, 102, 241, 0.45);
  transform: translateY(-2px);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: var(--accent-dim);
}

.btn-nav {
  padding: 9px 20px;
  font-size: 0.875rem;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-xs);
  box-shadow: 0 0 18px rgba(99, 102, 241, 0.25);
}

.btn-nav:hover {
  background: var(--accent-light);
  color: #fff;
  transform: none;
}

/* =============================================
   NAVIGATION
   ============================================= */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 22px 0;
  transition: padding var(--duration) var(--ease),
              background var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
}

.site-header.scrolled {
  background: rgba(9, 9, 15, 0.82);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 14px 0;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.04em;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo span { color: var(--accent-light); }
.nav-logo:hover { color: var(--text-primary); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-links li { display: flex; align-items: center; }

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--duration) var(--ease);
  position: relative;
}

.nav-links a:not(.btn-nav):hover { color: var(--text-primary); }

.nav-links a:not(.btn-nav)::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  right: 100%;
  height: 1px;
  background: var(--accent-light);
  transition: right var(--duration) var(--ease);
}

.nav-links a:not(.btn-nav):hover::after { right: 0; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  z-index: 101;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--duration) var(--ease);
  transform-origin: center;
}

.nav-toggle.open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle.open span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* =============================================
   HERO
   ============================================= */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 70% 60% at 15% 55%, rgba(99, 102, 241, 0.09) 0%, transparent 70%),
    radial-gradient(ellipse 50% 40% at 85% 20%, rgba(6, 182, 212, 0.06) 0%, transparent 60%),
    radial-gradient(ellipse 40% 50% at 60% 80%, rgba(99, 102, 241, 0.04) 0%, transparent 60%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  padding-top: 110px;
  padding-bottom: 80px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 16px;
  background: rgba(99, 102, 241, 0.10);
  border: 1px solid rgba(99, 102, 241, 0.22);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent-light);
  margin-bottom: 32px;
  letter-spacing: 0.01em;
}

.status-dot {
  width: 7px;
  height: 7px;
  background: var(--green);
  border-radius: 50%;
  box-shadow: 0 0 6px rgba(34, 197, 94, 0.7);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.55; transform: scale(1.4); }
}

.hero-name {
  font-size: clamp(2.8rem, 7vw, 5.5rem);
  font-weight: 700;
  margin-bottom: 22px;
  line-height: 1.05;
  letter-spacing: -0.03em;
}

.hero-name span {
  color: var(--accent-light);
  position: relative;
}

.hero-tagline {
  font-family: var(--font-heading);
  font-size: clamp(1.2rem, 2.5vw, 1.8rem);
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 18px;
  letter-spacing: -0.01em;
}

.hero-sub {
  max-width: 560px;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 44px;
}

.hero-cta {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

/* =============================================
   ABOUT
   ============================================= */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 80px;
  align-items: start;
}

.about-text .section-label { margin-bottom: 14px; }

.about-text h2 {
  margin: 0 0 26px;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  padding-top: 64px;
}

.stat-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 20px;
  text-align: center;
  transition: border-color var(--duration) var(--ease),
              transform var(--duration) var(--ease);
}

.stat-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.stat-number {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.1rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 500;
  line-height: 1.4;
}

/* =============================================
   SERVICES
   ============================================= */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.service-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: border-color var(--duration) var(--ease),
              transform var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease);
}

.service-card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
  box-shadow: 0 20px 48px rgba(99, 102, 241, 0.09);
}

.service-icon {
  font-size: 1.8rem;
  margin-bottom: 18px;
  display: block;
  line-height: 1;
}

.service-card h3 {
  margin-bottom: 12px;
  line-height: 1.3;
}

.service-card p { font-size: 0.9rem; }

/* =============================================
   SKILLS & TOOLS
   ============================================= */
.skills-layout {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 48px 64px;
  margin-bottom: 64px;
}

.skills-group h3 {
  font-size: 0.73rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 16px;
  font-family: var(--font-body);
}

.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag {
  padding: 8px 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.84rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--duration) var(--ease);
  cursor: default;
}

.tag:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: var(--accent-dim);
}

.certs-label {
  font-size: 0.73rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-bottom: 20px;
  font-family: var(--font-body);
}

.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
  gap: 12px;
}

.cert-badge {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: border-color var(--duration) var(--ease);
}

.cert-badge:hover { border-color: var(--accent); }

.cert-icon {
  font-size: 1rem;
  flex-shrink: 0;
}

/* =============================================
   WORK EXPERIENCE — TIMELINE
   ============================================= */
.timeline {
  position: relative;
  max-width: 760px;
  margin: 0 auto;
  padding-left: 28px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--accent) 0%, rgba(99,102,241,0.15) 80%, transparent 100%);
}

.timeline-item {
  position: relative;
  padding-bottom: 56px;
}

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
  content: '';
  position: absolute;
  left: -34px;
  top: 9px;
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 50%;
  border: 3px solid var(--bg-alt);
  box-shadow: 0 0 12px rgba(99, 102, 241, 0.5);
}

.timeline-meta {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.timeline-date {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-light);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.timeline-location {
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 500;
}

.timeline-content h3 { margin-bottom: 3px; }
.timeline-content h4 { margin-bottom: 12px; }
.timeline-content p { font-size: 0.92rem; }

/* =============================================
   CASE STUDIES
   ============================================= */
.case-studies-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.case-study-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 0;
  transition: border-color var(--duration) var(--ease),
              transform var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease);
}

.case-study-card:hover {
  border-color: var(--accent);
  transform: translateY(-5px);
  box-shadow: 0 20px 48px rgba(99, 102, 241, 0.08);
}

.case-study-client {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-light);
  margin-bottom: 10px;
}

.case-study-card h3 {
  font-size: 1.05rem;
  margin-bottom: 22px;
  line-height: 1.35;
  color: var(--text-primary);
}

.case-study-section {
  margin-bottom: 16px;
}

.case-study-section-label {
  display: block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 5px;
}

.case-study-section p {
  font-size: 0.87rem;
  line-height: 1.65;
  margin: 0;
}

.case-study-result {
  margin-top: auto;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}

.result-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: rgba(99, 102, 241, 0.1);
  border: 1px solid rgba(99, 102, 241, 0.2);
  border-radius: var(--radius-xs);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent-light);
  line-height: 1.4;
}

.loading-state {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--text-muted);
  padding: 72px 0;
  font-size: 0.9rem;
}

/* =============================================
   CONTACT
   ============================================= */
.contact-wrapper {
  max-width: 680px;
  margin: 0 auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 52px 48px;
  min-height: 180px;
}

/* =============================================
   FOOTER
   ============================================= */
.footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 52px 0;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  text-align: center;
}

.footer-tagline {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0;
}

.footer-nav {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  justify-content: center;
}

.footer-nav a {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

.footer-nav a:hover { color: var(--accent-light); }

.footer-copy {
  color: var(--text-muted);
  font-size: 0.78rem;
  margin: 0;
}

/* =============================================
   SCROLL ANIMATIONS
   ============================================= */
.fade-in {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =============================================
   RESPONSIVE — TABLET
   ============================================= */
@media (max-width: 960px) {
  .section { padding: 80px 0; }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 52px;
  }

  .about-stats { padding-top: 0; }

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

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

  .skills-layout {
    grid-template-columns: 1fr 1fr;
    gap: 36px 48px;
  }
}

/* =============================================
   RESPONSIVE — MOBILE
   ============================================= */
@media (max-width: 720px) {
  .nav-links {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(9, 9, 15, 0.97);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 36px;
    z-index: 99;
  }

  .nav-links.open { display: flex; }

  .nav-links li { width: auto; }

  .nav-links a:not(.btn-nav) {
    font-size: 1.3rem;
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--text-primary);
  }

  .nav-links a:not(.btn-nav)::after { display: none; }

  .btn-nav { font-size: 1rem; padding: 12px 28px; }

  .nav-toggle { display: flex; }

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

  .case-studies-grid { grid-template-columns: 1fr; }

  .skills-layout { grid-template-columns: 1fr; gap: 32px; }

  .timeline { padding-left: 0; }
  .timeline::before { display: none; }
  .timeline-item { padding-bottom: 44px; }
  .timeline-item::before { display: none; }

  .contact-wrapper { padding: 32px 24px; }

  .about-stats { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
  .container { padding: 0 20px; }

  .hero-cta {
    flex-direction: column;
    align-items: flex-start;
  }

  .btn { width: 100%; justify-content: center; }
  .btn-ghost { width: auto; }

  .stat-number { font-size: 1.7rem; }
}