:root {
  --ink: #14213D;
  --ink-soft: #3B4863;
  --muted: #6B7385;
  --paper: #F4F6F9;
  --surface: #FFFFFF;
  --line: #DEE3EC;
  --accent: #2F5FFF;
  --accent-soft: #E8EDFF;
  --mint: #00C2A8;

  --font-display: "Space Grotesk", sans-serif;
  --font-mono: "JetBrains Mono", monospace;
  --font-body: "Inter", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  line-height: 1.6;
}

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

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent);
  letter-spacing: 0.02em;
  margin-bottom: 10px;
}

.eyebrow .prompt {
  color: var(--mint);
  margin-right: 6px;
}

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--ink);
  letter-spacing: -0.01em;
}

h2 {
  font-size: 2rem;
  margin-bottom: 32px;
}

/* NAV */
nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(244, 246, 249, 0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 18px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 1.1rem;
  color: var(--ink);
}

.brand .dot {
  color: var(--accent);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 28px;
}

nav ul a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--ink-soft);
  position: relative;
}

nav ul a:hover {
  color: var(--accent);
}

/* HERO */
.hero {
  position: relative;
  overflow: hidden;
  padding: 120px 24px 100px;
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.5;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, black 40%, transparent 90%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  animation: rise 0.7s ease both;
}

.hero h1 {
  font-size: clamp(2.8rem, 6vw, 4.2rem);
  margin: 8px 0 18px;
}

.hero .eyebrow {
  justify-content: center;
  display: inline-flex;
}

.hero .eyebrow .prompt::after {
  content: "";
  display: inline-block;
  width: 8px;
  height: 1em;
  background: var(--mint);
  margin-left: 6px;
  vertical-align: -2px;
  animation: blink 1s steps(1) infinite;
}

.tagline {
  font-size: 1.15rem;
  color: var(--ink-soft);
  max-width: 560px;
  margin: 0 auto 34px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
}

.btn {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  padding: 13px 24px;
  border-radius: 6px;
  font-weight: 500;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}

.btn-primary:hover {
  background: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(47, 95, 255, 0.25);
}

.btn-ghost {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink);
}

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

/* SECTIONS */
main section {
  max-width: 1040px;
  margin: 0 auto;
  padding: 90px 24px;
  border-bottom: 1px solid var(--line);
}

main section:last-of-type {
  border-bottom: none;
}

.about-body p {
  font-size: 1.1rem;
  color: var(--ink-soft);
  max-width: 700px;
}

/* SKILLS */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 20px;
}

.skill-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 26px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

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

.skill-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.skill-card p {
  color: var(--muted);
  font-size: 0.95rem;
}

/* PROJECTS */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 22px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 30px rgba(20, 33, 61, 0.08);
  border-color: var(--accent);
}

.card-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card-index {
  font-family: var(--font-mono);
  color: var(--mint);
  font-weight: 500;
  font-size: 0.9rem;
}

.card-links {
  display: flex;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.card-links a {
  color: var(--muted);
}

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

.card-wip {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--mint);
}

.card h3 {
  font-size: 1.15rem;
}

.card p {
  color: var(--muted);
  font-size: 0.95rem;
  flex-grow: 1;
}

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

.tags li {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--accent-soft);
  color: var(--accent);
  padding: 4px 10px;
  border-radius: 20px;
}

/* CERTIFICATES */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}

.cert-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 26px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
}

.cert-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 30px rgba(20, 33, 61, 0.08);
  border-color: var(--accent);
}

.cert-card .card-index {
  margin-bottom: 6px;
}

.cert-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.cert-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--muted);
}

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

.cert-card h3 {
  font-size: 1.1rem;
}

.cert-issuer {
  color: var(--ink-soft);
  font-size: 0.95rem;
  font-weight: 500;
}

.cert-date {
  font-family: var(--font-mono);
  color: var(--muted);
  font-size: 0.8rem;
}

/* CONTACT */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.contact-item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 22px 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

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

.contact-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--mint);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.contact-value {
  font-size: 1rem;
  font-weight: 500;
  color: var(--ink);
}

/* FOOTER */
footer {
  text-align: center;
  padding: 36px 24px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: var(--muted);
}

/* ANIMATIONS */
@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes blink {
  0%, 49% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .hero-inner { animation: none; }
  .eyebrow .prompt::after { animation: none; }
}

/* RESPONSIVE */
@media (max-width: 640px) {
  .nav-inner ul {
    gap: 16px;
  }
  .hero {
    padding: 90px 20px 70px;
  }
  main section {
    padding: 60px 20px;
  }
}