:root {
  --bg: #05070f;
  --bg-elev: #0a0f1e;
  --bg-card: #0c1224;
  --bg-card-hover: #101a33;
  --border: rgba(56, 189, 248, 0.16);
  --border-strong: rgba(56, 189, 248, 0.4);
  --text: #e6edf7;
  --text-dim: #9aa8c0;
  --text-mono: #7dd3fc;
  --accent: #38bdf8;
  --accent-2: #a78bfa;
  --accent-3: #34d399;
  --danger: #fb7185;
  --glow: 0 0 24px rgba(56, 189, 248, 0.35);
  --radius: 14px;
  --font-main: "Space Grotesk", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --max-width: 1160px;
}

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

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

body {
  font-family: var(--font-main);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

.mono {
  font-family: var(--font-mono);
}

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

/* ---------- Background layers ---------- */

.grid-overlay {
  position: fixed;
  inset: 0;
  z-index: -2;
  background-image:
    linear-gradient(rgba(56, 189, 248, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(56, 189, 248, 0.045) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 30%, transparent 78%);
  pointer-events: none;
}

#particle-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.55;
}

/* ---------- Nav ---------- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 28px;
  background: rgba(5, 7, 15, 0.72);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}

.nav.scrolled {
  border-bottom-color: var(--border);
  background: rgba(5, 7, 15, 0.9);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  font-weight: 600;
}

.brand-text {
  font-size: 1.05rem;
  letter-spacing: 0.02em;
}

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

.nav-links a {
  color: var(--text-dim);
  font-size: 0.92rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
  transition: color 0.25s;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.25s;
}

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

.nav-links a:hover::after {
  width: 100%;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  width: 26px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Hero ---------- */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 140px 28px 80px;
}

.hero-content {
  width: 100%;
}

.hero-eyebrow {
  color: var(--text-mono);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  margin-bottom: 18px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.12;
  margin-bottom: 22px;
  font-weight: 700;
}

.hero-type {
  display: block;
  color: var(--accent);
  font-weight: 600;
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  line-height: 1.5;
  margin-top: 14px;
}

.hero-sub {
  color: var(--text-dim);
  font-size: 1.08rem;
  max-width: 620px;
  margin-bottom: 34px;
}

.hero-sub strong {
  color: var(--text);
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 44px;
}

.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.98rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s, border-color 0.2s;
}

.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #05070f;
  box-shadow: var(--glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 34px rgba(56, 189, 248, 0.55);
}

.btn-ghost {
  border-color: var(--border-strong);
  color: var(--text);
  background: rgba(12, 18, 36, 0.5);
}

.btn-ghost:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.hero-stats {
  display: flex;
  gap: 44px;
  list-style: none;
  flex-wrap: wrap;
}

.hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-num,
.stat-suffix {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
}

.stat-suffix {
  margin-top: -2px;
}

.stat-label {
  color: var(--text-dim);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

/* ---------- Sections ---------- */

.section {
  padding: 110px 28px;
}

.section-alt {
  background: linear-gradient(180deg, rgba(10, 15, 30, 0.6), rgba(5, 7, 15, 0.2));
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section-title {
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  margin-bottom: 16px;
}

.section-index {
  color: var(--accent);
  font-size: 1rem;
  margin-right: 14px;
  vertical-align: middle;
}

.section-lead {
  color: var(--text-dim);
  max-width: 640px;
  margin-bottom: 44px;
}

/* ---------- About ---------- */

.about-grid {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 48px;
  align-items: start;
}

.about-text p {
  color: var(--text-dim);
  margin-bottom: 18px;
}

.about-text strong {
  color: var(--text);
}

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

.about-philosophy {
  list-style: none;
  margin-top: 26px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.about-philosophy li {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}

.phil-icon {
  font-family: var(--font-mono);
  color: var(--accent);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  padding: 4px 8px;
  font-size: 0.8rem;
  flex-shrink: 0;
}

.about-philosophy strong {
  color: var(--text);
}

.about-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 26px;
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
}

.about-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: 0 16px 44px rgba(0, 0, 0, 0.45);
}

.identity {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 22px;
  padding-bottom: 22px;
  border-bottom: 1px solid var(--border);
}

.identity-avatar {
  width: 60px;
  height: 60px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.2rem;
  background: linear-gradient(135deg, var(--accent-2), var(--accent));
  color: #05070f;
}

.identity-name {
  font-weight: 600;
  font-size: 1.1rem;
}

.identity-role {
  color: var(--text-mono);
  font-size: 0.82rem;
}

.identity-meta div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 9px 0;
}

.identity-meta dt {
  color: var(--text-dim);
  font-size: 0.86rem;
}

.identity-meta dd {
  text-align: right;
  font-size: 0.9rem;
}

.status-dot {
  display: inline-block;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent-3);
  box-shadow: 0 0 10px var(--accent-3);
  margin-right: 8px;
}

/* ---------- Expertise ---------- */

.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 26px;
}

.expertise-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 30px 26px;
  transition: transform 0.3s, box-shadow 0.3s, border-color 0.3s;
  position: relative;
  overflow: hidden;
}

.expertise-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), var(--accent-3));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s;
}

.expertise-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-strong);
  box-shadow: 0 18px 50px rgba(0, 0, 0, 0.5);
}

.expertise-card:hover::before {
  transform: scaleX(1);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent);
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid var(--border);
  margin-bottom: 22px;
}

.expertise-card h3 {
  font-size: 1.2rem;
  margin-bottom: 12px;
}

.expertise-card p {
  color: var(--text-dim);
  font-size: 0.94rem;
  margin-bottom: 18px;
}

.skill-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.skill-tags li {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-mono);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 12px;
  background: rgba(56, 189, 248, 0.06);
}

.stack {
  color: var(--text-dim);
  font-size: 0.8rem;
}

/* ---------- Services ---------- */

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.service-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 26px;
  transition: transform 0.25s, border-color 0.25s, background 0.25s;
}

.service-item:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  background: var(--bg-card-hover);
}

.service-item h3 {
  font-size: 1.05rem;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.service-item h3::before {
  content: ">";
  font-family: var(--font-mono);
  color: var(--accent);
}

.service-item p {
  color: var(--text-dim);
  font-size: 0.92rem;
}

/* ---------- Work with me / contact form ---------- */

.topic-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 36px;
}

.topic-chip {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-mono);
  background: rgba(12, 18, 36, 0.8);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 10px 20px;
  cursor: pointer;
  transition: transform 0.2s, border-color 0.2s, background 0.2s, color 0.2s, box-shadow 0.2s;
}

.topic-chip:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
}

.topic-chip.active {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #05070f;
  font-weight: 600;
  border-color: transparent;
  box-shadow: var(--glow);
}

.contact-form {
  max-width: 760px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 34px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-field {
  margin-bottom: 22px;
}

.form-field label {
  display: block;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 8px;
  font-weight: 500;
}

.form-field input,
.form-field textarea {
  width: 100%;
  font-family: var(--font-main);
  font-size: 0.98rem;
  color: var(--text);
  background: rgba(5, 7, 15, 0.7);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 13px 15px;
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.form-field input:read-only {
  color: var(--text-mono);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.form-field textarea {
  resize: vertical;
  min-height: 130px;
}

.field-error {
  color: var(--danger);
  font-size: 0.82rem;
  margin-top: 6px;
}

.form-field.invalid input,
.form-field.invalid textarea {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(251, 113, 133, 0.12);
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.form-note {
  color: var(--text-dim);
  font-size: 0.78rem;
}

.form-status {
  color: var(--accent-3);
  font-size: 0.85rem;
  margin-top: 14px;
}

/* ---------- Connect ---------- */

.connect-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.connect-card {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-card);
  padding: 28px;
  color: var(--text);
  transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
}

.connect-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--glow);
}

.connect-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-weight: 700;
  background: rgba(56, 189, 248, 0.1);
  border: 1px solid var(--border);
  color: var(--accent);
  margin-bottom: 10px;
}

.connect-label {
  font-size: 1.05rem;
  font-weight: 600;
}

.connect-sub {
  color: var(--text-dim);
  font-size: 0.86rem;
}

/* ---------- Footer ---------- */

.footer {
  border-top: 1px solid var(--border);
  padding: 40px 28px;
  text-align: center;
  background: rgba(5, 7, 15, 0.7);
}

.footer p {
  color: var(--text-dim);
  font-size: 0.9rem;
}

.footer .mono {
  color: var(--text-mono);
  margin-bottom: 10px;
}

/* ---------- Reveal animations ---------- */

[data-reveal] {
  opacity: 0;
  transition: opacity 1s ease;
}

[data-reveal].revealed {
  opacity: 1;
}

/* ---------- Responsive ---------- */

@media (max-width: 960px) {
  .hero {
    flex-direction: column;
    padding-top: 120px;
  }

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

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

@media (max-width: 680px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 4px;
    background: rgba(5, 7, 15, 0.97);
    border-bottom: 1px solid var(--border);
    padding: 14px 28px;
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s, transform 0.25s;
  }

  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-links a {
    padding: 12px 0;
    border-bottom: 1px solid rgba(56, 189, 248, 0.08);
  }

  .nav-toggle {
    display: flex;
  }

  .hero-stats {
    gap: 26px;
  }

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

  .form-row {
    grid-template-columns: 1fr;
    gap: 0;
  }

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

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}