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

:root {
  --white: #ffffff;
  --black: #0f0f0f;
  --grey-100: #f5f5f5;
  --grey-200: #e8e8e8;
  --grey-400: #9e9e9e;
  --grey-600: #5a5a5a;
  --net-dot: rgba(30, 64, 175, 0.18);
  --net-line: rgba(30, 64, 175, 0.07);
  --accent: #1e3a8a;
  --accent-soft: rgba(30, 58, 138, 0.08);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Inter", sans-serif;
  background: var(--white);
  color: var(--black);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ── NETWORK CANVAS ── */
#network-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ── NAV ── */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--grey-200);
  padding: 0 48px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: "DM Sans", sans-serif;
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.02em;
  color: var(--black);
}

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 13px;
  font-weight: 500;
  color: var(--grey-600);
  text-decoration: none;
  letter-spacing: 0.01em;
  transition: color 0.2s;
}

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

/* ── MAIN WRAPPER ── */
main {
  position: relative;
  z-index: 1;
}

/* ── HERO ── */
#hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
}

.hero-eyebrow {
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
  opacity: 0;
  animation: fadeUp 0.7s 0.2s ease forwards;
}

.hero-hello {
  font-family: "DM Sans", sans-serif;
  font-size: clamp(42px, 7vw, 88px);
  font-weight: 300;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--black);
  opacity: 0;
  animation: fadeUp 0.7s 0.4s ease forwards;
}

.hero-hello .name {
  font-weight: 700;
  display: block;
}

.hero-sub {
  margin-top: 24px;
  font-size: 15px;
  color: var(--grey-600);
  max-width: 440px;
  opacity: 0;
  animation: fadeUp 0.7s 0.6s ease forwards;
}

.hero-divider {
  margin-top: 48px;
  width: 48px;
  height: 2px;
  background: var(--accent);
  opacity: 0;
  animation: fadeUp 0.7s 0.8s ease forwards;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ── SECTION BASE ── */
section {
  position: relative;
  z-index: 1;
  max-width: 960px;
  margin: 0 auto;
  padding: 80px 24px;
}

.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title {
  font-family: "DM Sans", sans-serif;
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--black);
  margin-bottom: 40px;
}

.section-rule {
  width: 100%;
  height: 1px;
  background: var(--grey-200);
  margin-bottom: 60px;
}

/* ── PROFILE ── */
#profile .profile-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 56px;
  align-items: start;
}

.profile-img-wrap {
  position: relative;
}

.profile-img-wrap img,
.profile-img-placeholder {
  width: 200px;
  height: 200px;
  object-fit: cover;
  border-radius: 4px;
  display: block;
  border: 1px solid var(--grey-200);
}

.profile-img-placeholder {
  background: var(--grey-100);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 8px;
  color: var(--grey-400);
  font-size: 12px;
}

.profile-img-placeholder svg {
  width: 40px;
  height: 40px;
  stroke: var(--grey-400);
}

.profile-text h3 {
  font-family: "DM Sans", sans-serif;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.profile-text .profile-role {
  font-size: 13px;
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: 20px;
}

.profile-text p {
  font-size: 14.5px;
  color: var(--grey-600);
  line-height: 1.78;
  margin-bottom: 14px;
}

.profile-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
}

.profile-tag {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  padding: 4px 12px;
  border: 1px solid var(--grey-200);
  border-radius: 2px;
  color: var(--grey-600);
}

/* ── SKILLS ── */
#skills {
  background: var(--grey-100);
  max-width: 100%;
  padding: 80px 0;
}

#skills .inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 16px;
}

.skill-card {
  background: var(--white);
  border: 1px solid var(--grey-200);
  border-radius: 4px;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  transition:
    border-color 0.2s,
    box-shadow 0.2s,
    transform 0.2s;
  cursor: default;
}

.skill-card:hover {
  border-color: var(--accent);
  box-shadow: 0 4px 20px rgba(30, 58, 138, 0.08);
  transform: translateY(-2px);
}

.skill-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.skill-icon svg,
.skill-icon img {
  width: 36px;
  height: 36px;
}

.skill-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--black);
  text-align: center;
  letter-spacing: 0.01em;
}

/* ── CERTIFICATES ── */
#certificates .cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 20px;
}

.cert-slot {
  border: 1.5px dashed var(--grey-200);
  border-radius: 4px;
  overflow: hidden;
  aspect-ratio: 4/3;
  position: relative;
  background: var(--grey-100);
  transition: border-color 0.2s;
}

.cert-slot:hover {
  border-color: var(--grey-400);
}

.cert-slot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.cert-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: var(--grey-400);
}

.cert-placeholder svg {
  width: 32px;
  height: 32px;
  stroke: var(--grey-300);
}

.cert-placeholder span {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.cert-number {
  position: absolute;
  top: 10px;
  left: 12px;
  font-size: 10px;
  font-weight: 600;
  color: var(--grey-400);
  letter-spacing: 0.08em;
}

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--grey-200);
  padding: 40px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  position: relative;
  z-index: 1;
}

.footer-icons {
  display: flex;
  gap: 24px;
}

.footer-icon {
  width: 40px;
  height: 40px;
  border: 1px solid var(--grey-200);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--grey-600);
  text-decoration: none;
  transition:
    border-color 0.2s,
    color 0.2s,
    transform 0.2s;
}

.footer-icon:hover {
  border-color: var(--black);
  color: var(--black);
  transform: translateY(-2px);
}

.footer-icon svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.footer-copy {
  font-size: 12px;
  color: var(--grey-400);
  letter-spacing: 0.03em;
}