```css
* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", Inter, Arial, sans-serif;
  background: #080b12;
  color: #eef2f7;
  line-height: 1.65;
  transition: background 0.3s ease, color 0.3s ease;
}

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

.container {
  width: min(1160px, 92%);
  margin: auto;
}

/* =========================
   HEADER
========================= */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(8, 11, 18, 0.88);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid #202632;
}

.nav {
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 12px;
  background: #eef2f7;
  color: #080b12;
  font-weight: 900;
}

.nav nav {
  display: flex;
  align-items: center;
  gap: 26px;
  font-size: 14px;
  color: #aeb8c7;
}

.nav nav a {
  transition: color 0.2s ease;
}

.nav nav a:hover {
  color: #ffffff;
}

.menu-toggle,
.theme-toggle {
  background: transparent;
  border: 0;
  color: #ffffff;
  cursor: pointer;
}

.theme-toggle {
  font-size: 19px;
}

.menu-toggle {
  display: none;
  font-size: 23px;
}


/* =========================
   HERO
========================= */

.hero {
  min-height: 720px;
  display: flex;
  align-items: center;
  padding: 110px 0 100px;
  background:
    radial-gradient(
      circle at 80% 20%,
      #192437 0,
      transparent 35%
    );
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.65fr;
  gap: 70px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 16px;
  color: #8995a6;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
}

.hero h1 {
  max-width: 850px;
  margin: 0 0 25px;
  font-size: clamp(44px, 6vw, 76px);
  line-height: 1.02;
  letter-spacing: -0.055em;
}

.hero h1 span {
  color: #98a5b6;
}

.hero-description {
  max-width: 720px;
  color: #aeb8c7;
  font-size: 19px;
}

.hero-buttons {
  display: flex;
  gap: 12px;
  margin: 32px 0 42px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 11px 20px;
  border-radius: 10px;
  border: 1px solid #303947;
  font-weight: 700;
  transition:
    transform 0.2s ease,
    background 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: #eef2f7;
  color: #080b12;
  border-color: #eef2f7;
}

.btn-secondary {
  background: #111721;
  color: #eef2f7;
}

.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 38px;
}

.stat {
  display: flex;
  flex-direction: column;
}

.stat strong {
  font-size: 26px;
}

.stat span {
  color: #8792a3;
  font-size: 12px;
}


/* =========================
   PROFILE CARD
========================= */

.profile-card {
  padding: 32px;
  border: 1px solid #293241;
  border-radius: 24px;
  background:
    linear-gradient(
      145deg,
      #121824,
      #0c1119
    );
  box-shadow:
    0 25px 80px rgba(0, 0, 0, 0.3);
}

.profile-avatar {
  width: 180px;
  height: 180px;
  margin: 0 auto 24px;
  border-radius: 50%;
  overflow: hidden;
  border: 4px solid #eef2f7;
  background: #111721;
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.35);
}

.profile-avatar img {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center top;
}
.availability {
  color: #cbd5e1 !important;
  font-size: 12px;
}

.profile-card h2 {
  margin: 15px 0 8px;
  line-height: 1.2;
}

.profile-card > p {
  color: #aeb8c7;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 22px;
}

.chips span {
  padding: 5px 9px;
  border: 1px solid #303947;
  border-radius: 7px;
  color: #aeb8c7;
  font-size: 11px;
}


/* =========================
   SECTIONS
========================= */

.section {
  padding: 105px 0;
}

.section-dark {
  background: #0c1018;
  border-top: 1px solid #1d2430;
  border-bottom: 1px solid #1d2430;
}

.section h2 {
  margin: 0 0 35px;
  font-size: clamp(32px, 4vw, 52px);
  line-height: 1.08;
  letter-spacing: -0.045em;
}

.two-column {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 90px;
}

.content-text {
  color: #aeb8c7;
  font-size: 17px;
}

.content-text p {
  margin-top: 0;
  margin-bottom: 23px;
}


/* =========================
   SKILLS
========================= */

.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 15px;
}

.skill-card {
  min-height: 205px;
  padding: 25px;
  border: 1px solid #252e3b;
  border-radius: 16px;
  background: #10151e;
  transition:
    transform 0.25s ease,
    border-color 0.25s ease;
}

.skill-card:hover {
  transform: translateY(-5px);
  border-color: #596679;
}

.skill-card > span {
  color: #778396;
  font-size: 11px;
  font-weight: 800;
}

.skill-card h3 {
  margin: 14px 0 8px;
}

.skill-card p {
  margin: 0;
  color: #8f9aaa;
  font-size: 14px;
}


/* =========================
   EXPERIENCE
========================= */

.timeline {
  margin-top: 45px;
  border-left: 1px solid #303947;
}

.timeline-item {
  position: relative;
  padding:
    0
    0
    48px
    38px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  top: 6px;
  left: -5px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #eef2f7;
}

.timeline-date {
  color: #8995a6;
  font-size: 12px;
  font-weight: 700;
}

.timeline-item h3 {
  margin: 7px 0;
  font-size: 22px;
}

.timeline-item p {
  max-width: 850px;
  margin: 0;
  color: #9ba6b5;
}


/* =========================
   PROJECTS
========================= */

.projects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
}

.project-card {
  min-height: 260px;
  padding: 27px;
  border: 1px solid #252e3b;
  border-radius: 17px;
  background: #10151e;
  transition:
    transform 0.25s ease,
    border-color 0.25s ease;
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: #596679;
}

.project-tag {
  display: inline-block;
  padding: 5px 9px;
  border: 1px solid #303947;
  border-radius: 7px;
  color: #aeb8c7;
  font-size: 10px;
  font-weight: 800;
}

.project-card h3 {
  margin: 17px 0 9px;
}

.project-card p {
  color: #8f9aaa;
  font-size: 14px;
}

.project-card small {
  color: #7f8b9d;
}


/* =========================
   ACHIEVEMENTS
========================= */

.achievement-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.achievement-grid > div {
  padding-top: 20px;
  border-top: 1px solid #344050;
}

.achievement-grid strong {
  color: #8995a6;
  font-size: 12px;
}

.achievement-grid p {
  color: #aeb8c7;
}


/* =========================
   CONTACT
========================= */

.contact-section {
  padding-top: 80px;
  padding-bottom: 110px;
}

.contact-card {
  display: grid;
  grid-template-columns: 1fr 0.55fr;
  gap: 50px;
  align-items: center;
  padding: 55px;
  border: 1px solid #303947;
  border-radius: 25px;
  background: #10151e;
}

.contact-card h2 {
  margin-bottom: 20px;
}

.contact-card p {
  max-width: 720px;
  color: #aeb8c7;
}

.contact-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}


/* =========================
   FOOTER
========================= */

footer {
  padding: 30px 0;
  border-top: 1px solid #202632;
  color: #788496;
  font-size: 12px;
}

footer span {
  margin: 0 6px;
}


/* =========================
   LIGHT MODE
========================= */

.light-mode {
  background: #f4f6f8;
  color: #111722;
}

.light-mode .site-header {
  background: rgba(255, 255, 255, 0.9);
  border-color: #dce1e8;
}

.light-mode .nav nav {
  color: #5d6877;
}

.light-mode .nav nav a:hover {
  color: #111722;
}

.light-mode .theme-toggle {
  color: #111722;
}

.light-mode .hero {
  background:
    radial-gradient(
      circle at 80% 20%,
      #e3e9ef 0,
      transparent 35%
    );
}

.light-mode .hero h1 span {
  color: #596575;
}

.light-mode .hero-description,
.light-mode .content-text,
.light-mode .profile-card > p,
.light-mode .skill-card p,
.light-mode .timeline-item p,
.light-mode .project-card p,
.light-mode .contact-card p {
  color: #5c6776;
}

.light-mode .section-dark {
  background: #ffffff;
  border-color: #dce1e8;
}

.light-mode .profile-card,
.light-mode .skill-card,
.light-mode .project-card,
.light-mode .contact-card {
  background: #ffffff;
  border-color: #dce1e8;
}

.light-mode .btn-secondary {
  background: #ffffff;
  color: #111722;
  border-color: #ccd3dc;
}

.light-mode .profile-avatar,
.light-mode .brand-mark {
  background: #111722;
  color: #ffffff;
}


/* =========================
   MOBILE
========================= */

@media (max-width: 900px) {

  .menu-toggle {
    display: block;
  }

  .nav nav {
    display: none;
  }

  .nav nav.mobile-open {
    position: absolute;
    top: 76px;
    left: 0;
    right: 0;

    display: flex;
    flex-direction: column;

    padding: 24px;

    background: #0c1018;
    border-bottom: 1px solid #222b38;
  }

  .hero-grid,
  .two-column,
  .contact-card {
    grid-template-columns: 1fr;
  }

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

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

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

  .contact-buttons {
    justify-content: flex-start;
  }

  .hero {
    padding-top: 75px;
  }

}


/* =========================
   SMALL MOBILE
========================= */

@media (max-width: 560px) {

  .container {
    width: min(92%, 520px);
  }

  .nav {
    height: 68px;
  }

  .hero {
    min-height: auto;
    padding: 70px 0;
  }

  .hero h1 {
    font-size: 43px;
  }

  .hero-description {
    font-size: 17px;
  }

  .hero-buttons {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }

  .stats {
    gap: 20px;
  }

  .section {
    padding: 75px 0;
  }

  .skills-grid,
  .projects-grid,
  .achievement-grid {
    grid-template-columns: 1fr;
  }

  .profile-card {
    padding: 25px;
  }

  .contact-card {
    padding: 30px;
  }

}


/* =========================
   ACCESSIBILITY
========================= */

:focus-visible {
  outline: 2px solid #ffffff;
  outline-offset: 4px;
}

::selection {
  background: #ffffff;
  color: #080b12;
}
```