@font-face {
  font-family: "Inter";
  src: url("../assets/fonts/inter-latin-var.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: dark;
  --color-bg: #070b14;
  --color-bg-alt: #0a101d;
  --color-surface: #0e1627;
  --color-border: #1a2438;
  --color-text: #dbe4f0;
  --color-text-strong: #ffffff;
  --color-text-muted: #8fa3bf;
  --color-primary: #3b82f6;
  --color-primary-light: #7cb0ff;
  --color-button: #2563eb;
  --color-button-hover: #1d4ed8;
  --max-width: 1100px;
  --radius: 14px;
  --header-height: 64px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
}

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

html {
  background: var(--color-bg);
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.accent {
  color: var(--color-primary);
}

.nowrap {
  white-space: nowrap;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 300;
  padding: 10px 16px;
  background: var(--color-button);
  color: #fff;
  border-radius: 8px;
  font-weight: 600;
}

.skip-link:focus {
  top: 12px;
}

:focus-visible {
  outline: 2px solid var(--color-primary-light);
  outline-offset: 3px;
}

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: rgba(7, 11, 20, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(26, 36, 56, 0.7);
  z-index: 100;
}

.header__inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 7px;
  background: var(--color-button);
  color: #fff;
  font-weight: 800;
  font-size: 0.95rem;
  line-height: 1;
}

.brand__name {
  margin: 0;
  color: var(--color-text-strong);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
}

.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  padding: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 9px;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.nav-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform 0.25s, opacity 0.25s;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

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

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.nav {
  display: none;
}

.nav.is-open {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: calc(100% + 8px);
  right: 20px;
  min-width: 200px;
  padding: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.55);
}

.nav__link {
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.95rem;
}

.nav__link:hover,
.nav__link:focus-visible {
  background: rgba(59, 130, 246, 0.12);
  color: var(--color-primary-light);
}

/* Hero */
.hero {
  padding: calc(var(--header-height) + 32px) 0 56px;
  background: radial-gradient(ellipse 90% 45% at 50% 0%, rgba(37, 99, 235, 0.16), transparent 75%);
  text-align: center;
}

.hero__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.hero__photo {
  width: 190px;
  height: 190px;
  flex-shrink: 0;
  padding: 3px;
  border-radius: 50%;
  background: linear-gradient(160deg, var(--color-primary), rgba(59, 130, 246, 0.15));
  box-shadow:
    0 0 0 6px rgba(59, 130, 246, 0.07),
    0 12px 40px rgba(37, 99, 235, 0.28);
}

.hero__photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  border: 3px solid var(--color-bg);
}

.hero__heading {
  margin: 0 0 14px;
  font-weight: 800;
}

.hero__name {
  display: block;
  margin-bottom: 6px;
  color: var(--color-text-muted);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.hero__title {
  display: block;
  color: var(--color-text-strong);
  font-size: clamp(2.5rem, 11vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.035em;
}

.hero__subtitle {
  max-width: 340px;
  margin: 0 auto 16px;
  color: var(--color-text-muted);
  font-size: 1rem;
  line-height: 1.55;
}

.hero__stack {
  margin: 0 0 26px;
  color: var(--color-primary-light);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.18em;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  border: none;
  border-radius: 10px;
  font-family: inherit;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.btn--primary {
  background: var(--color-button);
  color: #fff;
  box-shadow: 0 10px 28px rgba(37, 99, 235, 0.3);
}

.btn--primary:hover {
  background: var(--color-button-hover);
  transform: translateY(-2px);
}

/* Sections */
.section {
  padding: 72px 0;
  text-align: center;
}

.section--alt {
  background: var(--color-bg-alt);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

.section__eyebrow {
  margin: 0 0 8px;
  color: var(--color-primary-light);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.section__title {
  max-width: 700px;
  margin: 0 auto 18px;
  color: var(--color-text-strong);
  font-size: clamp(1.6rem, 6vw, 2.3rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.section__text {
  max-width: 660px;
  margin: 0 auto;
  color: var(--color-text-muted);
}

/* Cards */
.cards {
  display: grid;
  gap: 16px;
  margin-top: 36px;
  text-align: left;
}

.card {
  padding: 26px 22px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  transition: border-color 0.2s, transform 0.2s;
}

.card:hover {
  border-color: rgba(59, 130, 246, 0.45);
  transform: translateY(-3px);
}

.card__index {
  display: block;
  margin-bottom: 10px;
  color: var(--color-primary);
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
}

.card h3 {
  margin: 0 0 8px;
  color: var(--color-text-strong);
  font-size: 1.1rem;
  letter-spacing: -0.01em;
}

.card p {
  margin: 0;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.projects {
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}

.project {
  display: flex;
  flex-direction: column;
  padding: 0;
  overflow: hidden;
}

.project__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 20px;
  background:
    radial-gradient(circle at 0% 0%, rgba(37, 99, 235, 0.22), transparent 60%),
    linear-gradient(rgba(59, 130, 246, 0.06) 1px, transparent 1px) 0 0 / 16px 16px,
    linear-gradient(90deg, rgba(59, 130, 246, 0.06) 1px, transparent 1px) 0 0 / 16px 16px,
    var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}

.project__icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 11px;
  background: rgba(37, 99, 235, 0.14);
  border: 1px solid rgba(59, 130, 246, 0.35);
  color: var(--color-primary-light);
}

.project__status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: rgba(7, 11, 20, 0.6);
  color: var(--color-text-muted);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  white-space: nowrap;
}

.project__status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
}

.project__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: 20px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: auto 0 0;
  padding: 16px 0 0;
  list-style: none;
}

.tags li {
  padding: 4px 10px;
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: 6px;
  background: rgba(37, 99, 235, 0.08);
  color: var(--color-primary-light);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

/* Contact form */
.form {
  display: flex;
  flex-direction: column;
  gap: 6px;
  max-width: 480px;
  margin: 36px auto 0;
  text-align: left;
}

.form label {
  color: var(--color-text);
  font-weight: 600;
  font-size: 0.9rem;
}

.form input,
.form textarea {
  width: 100%;
  margin-bottom: 14px;
  padding: 12px 14px;
  background: var(--color-surface);
  color: var(--color-text-strong);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  font-family: inherit;
  font-size: 1rem;
}

.form input::placeholder,
.form textarea::placeholder {
  color: #7086a5;
}

.form input:focus,
.form textarea:focus {
  border-color: var(--color-primary);
}

.form .btn {
  margin-top: 4px;
}

/* Footer */
.footer {
  padding: 32px 0;
  text-align: center;
}

.footer p {
  margin: 4px 0;
}

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

/* Tablet */
@media (min-width: 640px) {
  .hero {
    padding: calc(var(--header-height) + 48px) 0 72px;
  }

  .hero__photo {
    width: 210px;
    height: 210px;
  }

  .hero__subtitle {
    max-width: 420px;
    font-size: 1.1rem;
  }

  .hero__stack {
    font-size: 0.75rem;
  }

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

  .projects {
    max-width: none;
  }

  .project:last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }
}

/* Desktop */
@media (min-width: 960px) {
  .hero {
    padding: calc(var(--header-height) + 72px) 0 96px;
    background: radial-gradient(ellipse 60% 55% at 70% 20%, rgba(37, 99, 235, 0.16), transparent 75%);
  }

  .hero__inner {
    flex-direction: row-reverse;
    justify-content: space-between;
    gap: 56px;
    text-align: left;
  }

  .hero__photo {
    width: 260px;
    height: 260px;
    margin-right: 40px;
  }

  .hero__subtitle {
    margin-left: 0;
  }

  .hero__title {
    font-size: 4.2rem;
  }

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

  .project:last-child:nth-child(odd) {
    grid-column: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
  }
}