/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
  --bg: #0A0F1E;
  --bg-surface: #111827;
  --bg-raised: #1C2333;
  --bg-border: #1E2940;
  --text-primary: #F0F4FF;
  --text-secondary: #8B9BB4;
  --text-muted: #4B5978;
  --accent: #3B82F6;
  --accent-hover: #60A5FA;
  --accent-glow: rgba(59, 130, 246, 0.25);
  --accent-subtle: rgba(59, 130, 246, 0.08);
  --success: #10B981;
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --nav-height: 68px;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.3);
  --transition: 0.25s ease;
}

/* ===== RESET ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
ul { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
input, textarea, select { font-family: inherit; }

/* ===== TYPOGRAPHY ===== */
h1, h2, h3 { font-weight: 700; line-height: 1.15; letter-spacing: -0.02em; }
h1 { font-size: clamp(2.5rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.75rem); }
h3 { font-size: 1.15rem; font-weight: 600; }
p { color: var(--text-secondary); }

.accent { color: var(--accent); }
em { color: var(--text-primary); font-style: normal; }

/* ===== LAYOUT ===== */
.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

.section {
  padding: 6rem 0;
  scroll-margin-top: var(--nav-height);
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.75rem;
}

.section-title {
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.1rem;
  max-width: 560px;
  margin-bottom: 3rem;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 0 24px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--bg-border);
}
.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-subtle);
}

.btn-lg {
  padding: 0.85rem 1.85rem;
  font-size: 1rem;
  border-radius: var(--radius);
}

.btn-full { width: 100%; justify-content: center; padding: 0.9rem; font-size: 1rem; }

/* ===== NAV ===== */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  transition: background var(--transition), backdrop-filter var(--transition), border-color var(--transition);
  border-bottom: 1px solid transparent;
}

.nav-header.scrolled {
  background: rgba(10, 15, 30, 0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-color: var(--bg-border);
}

.nav {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 2rem;
}

.nav-logo {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  flex-shrink: 0;
}

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

.nav-link {
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition), background var(--transition);
}
.nav-link:hover { color: var(--text-primary); background: var(--bg-raised); }

.nav-cta { margin-left: 0.5rem; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 0.4rem;
  margin-left: auto;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ===== HERO ===== */
#hero { scroll-margin-top: 0; }

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 0%, rgba(59, 130, 246, 0.12) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 80% 80%, rgba(59, 130, 246, 0.06) 0%, transparent 60%);
}

.hero-bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: radial-gradient(rgba(59, 130, 246, 0.12) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse 70% 70% at 50% 30%, black 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 70% 70% at 50% 30%, black 0%, transparent 80%);
}

.hero-content {
  position: relative;
  z-index: 1;
  padding-top: 3rem;
  padding-bottom: 3rem;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.hero-title { color: var(--text-primary); margin-bottom: 1.25rem; }

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  max-width: 580px;
  margin-bottom: 2.5rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.hero-ctas {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 4rem;
}

.hero-scroll {
  display: flex;
  align-items: center;
  gap: 1rem;
  color: var(--text-muted);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  font-family: var(--font-mono);
}

.scroll-line {
  width: 60px;
  height: 1px;
  background: linear-gradient(to right, var(--accent), transparent);
}

/* ===== ABOUT ===== */
.about { background: var(--bg-surface); }

.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  margin-top: 2.5rem;
}

.about-body {
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 1.25rem;
  color: var(--text-secondary);
}

.about-stats {
  display: flex;
  gap: 2rem;
  padding: 1.5rem;
  background: var(--bg-raised);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius);
  margin-top: 2rem;
  flex-wrap: wrap;
}

.stat { text-align: center; flex: 1; min-width: 80px; }

.stat-number {
  display: block;
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 0.3rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-family: var(--font-mono);
}

.about-card {
  background: var(--bg-raised);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.25rem;
}

.about-avatar {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent) 0%, #1d4ed8 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 32px var(--accent-glow);
}

.about-initials {
  font-size: 2.5rem;
  font-weight: 700;
  color: #fff;
  line-height: 1;
}

.about-card-name { font-size: 1.2rem; font-weight: 700; color: var(--text-primary); }
.about-card-role { font-size: 0.9rem; color: var(--text-secondary); margin-top: 0.2rem; }

.about-card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 0.5rem;
}

.tag {
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
  background: var(--accent-subtle);
  border: 1px solid rgba(59, 130, 246, 0.2);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 500;
  font-family: var(--font-mono);
}

/* ===== SERVICES ===== */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.service-card {
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.service-card:hover {
  transform: translateY(-4px);
  border-color: rgba(59, 130, 246, 0.4);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3), 0 0 0 1px rgba(59, 130, 246, 0.1);
}

.service-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 1.25rem;
  color: var(--accent);
}

.service-icon svg { width: 100%; height: 100%; }

.service-title {
  color: var(--text-primary);
  margin-bottom: 0.6rem;
}

.service-desc { font-size: 0.92rem; line-height: 1.7; }

/* ===== SKILLS ===== */
.skills { background: var(--bg-surface); }

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

.skill-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  padding: 1.25rem 0.75rem;
  background: var(--bg-raised);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius);
  transition: border-color var(--transition), transform var(--transition);
  text-align: center;
}

.skill-item:hover {
  border-color: rgba(59, 130, 246, 0.35);
  transform: translateY(-3px);
}

.skill-item i {
  font-size: 2rem;
  line-height: 1;
}

.skill-item span {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

/* ===== CONTACT ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 3rem;
  margin-top: 1rem;
}

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

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

.form-group label {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input,
.form-group textarea,
.form-group select {
  background: var(--bg-surface);
  border: 1px solid var(--bg-border);
  border-radius: var(--radius-sm);
  padding: 0.75rem 1rem;
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
  resize: vertical;
}

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

.form-group select { appearance: none; cursor: pointer; }
.form-group select option { background: var(--bg-surface); color: var(--text-primary); }

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-success {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-sm);
  color: var(--success);
  font-size: 0.92rem;
  font-weight: 500;
}

.form-success svg { width: 18px; height: 18px; flex-shrink: 0; stroke: var(--success); }

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.contact-detail {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.contact-icon {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  background: var(--accent-subtle);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
}

.contact-icon svg { width: 18px; height: 18px; }

.contact-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.2rem;
}

.contact-value {
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: color var(--transition);
}

a.contact-value:hover { color: var(--accent); }

.social-links {
  display: flex;
  gap: 0.75rem;
  margin-top: 0.5rem;
}

.social-link {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--bg-raised);
  border: 1px solid var(--bg-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition);
}

.social-link svg { width: 18px; height: 18px; }

.social-link:hover {
  color: var(--text-primary);
  border-color: var(--accent);
  background: var(--accent-subtle);
  transform: translateY(-2px);
}

/* ===== FOOTER ===== */
.footer {
  background: var(--bg-surface);
  border-top: 1px solid var(--bg-border);
  padding: 2rem 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

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

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: color var(--transition);
}

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

/* ===== RESPONSIVE ===== */
@media (min-width: 640px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .skills-grid { grid-template-columns: repeat(4, 1fr); }
  .about-card { flex-direction: row; text-align: left; }
  .about-card-tags { justify-content: flex-start; }
}

@media (min-width: 1024px) {
  .nav-links { display: flex; }
  .nav-cta { display: inline-flex; }
  .hamburger { display: none; }

  .services-grid { grid-template-columns: repeat(3, 1fr); }
  .skills-grid { grid-template-columns: repeat(6, 1fr); }

  .about-grid {
    grid-template-columns: 1fr 380px;
    align-items: start;
    gap: 5rem;
  }

  .about-card-wrap { position: sticky; top: calc(var(--nav-height) + 2rem); }

  .contact-grid { grid-template-columns: 1fr 360px; align-items: start; }
}

@media (max-width: 1023px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--bg-border);
    flex-direction: column;
    padding: 1rem 1.5rem 1.5rem;
    gap: 0.25rem;
  }

  .nav-links.open { display: flex; }
  .nav-link { padding: 0.65rem 0.85rem; font-size: 1rem; }

  .nav-cta { display: none; }
  .hamburger { display: flex; }
}

@media (max-width: 639px) {
  .section { padding: 4rem 0; }
  .hero-ctas { flex-direction: column; }
  .hero-ctas .btn { width: 100%; justify-content: center; }
  .skills-grid { grid-template-columns: repeat(3, 1fr); }
  .about-stats { gap: 1rem; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}