:root {
  --background: #ffffff;
  --surface: #f5f5f7;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --header: #0d1117;
  --header-border: #30363d;
  --accent: #0071e3;
  --max-width: 1180px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  background: var(--background);
  color: var(--text);
  line-height: 1.6;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ─── Header ─── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  background: rgba(13, 17, 23, 0.96);
  border-bottom: 1px solid var(--header-border);
  backdrop-filter: blur(16px);
}

.nav {
  width: min(100% - 32px, var(--max-width));
  min-height: 64px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: #f0f6fc;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border: 1px solid #8b949e;
  border-radius: 50%;
  font-size: 0.82rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.nav-links a {
  display: block;
  padding: 8px 12px;
  border-radius: 7px;
  color: #f0f6fc;
  font-size: 0.94rem;
  transition: background 180ms ease, color 180ms ease;
}

.nav-links a:hover,
.nav-links a:focus-visible,
.nav-links a.active {
  background: #21262d;
  color: #ffffff;
  outline: none;
}

/* ─── Buttons ─── */
.button {
  display: inline-block;
  min-width: 132px;
  padding: 12px 22px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  text-align: center;
  transition: transform 180ms ease, background 180ms ease;
}

.button:hover { transform: translateY(-2px); }
.button-primary { background: var(--accent); color: #ffffff; }
.button-secondary { color: var(--accent); background: transparent; }

/* ─── Sections ─── */
.section {
  padding: 110px 24px;
}

.section-inner {
  width: min(100%, var(--max-width));
  margin: 0 auto;
}

.section-center {
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
}

.eyebrow {
  margin-bottom: 18px;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.section h2 {
  margin-bottom: 20px;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.05em;
}

.section p {
  color: var(--muted);
  font-size: 1.15rem;
}

.section-alt { background: var(--surface); }

/* ─── Hero ─── */
.hero {
  min-height: calc(100vh - 64px);
  padding: 96px 24px 72px;
  display: grid;
  place-items: center;
  overflow: hidden;
  text-align: center;
  background:
    radial-gradient(circle at 50% 20%, rgba(0, 113, 227, 0.11), transparent 35%),
    linear-gradient(180deg, #ffffff 0%, #f5f5f7 100%);
}

.hero-content { width: min(100%, 900px); }

.hero h1 {
  max-width: 850px;
  margin: 0 auto;
  font-size: clamp(3rem, 8vw, 6.8rem);
  line-height: 0.95;
  letter-spacing: -0.065em;
}

.hero-copy {
  max-width: 670px;
  margin: 28px auto 0;
  color: var(--muted);
  font-size: clamp(1.1rem, 2.3vw, 1.45rem);
  letter-spacing: -0.02em;
}

.hero-actions {
  margin-top: 34px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
}

/* ─── Cards Grid ─── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.card {
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: 16px;
  padding: 32px;
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.08);
}

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: 18px;
  display: grid;
  place-items: center;
  background: rgba(0, 113, 227, 0.08);
  border-radius: 12px;
  font-size: 1.4rem;
}

.card h3 {
  margin-bottom: 10px;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}

.card p {
  color: var(--muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* ─── Portfolio Grid ─── */
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.portfolio-item {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  aspect-ratio: 16/10;
  background: var(--surface);
  border: 1px solid rgba(0, 0, 0, 0.06);
  transition: transform 200ms ease;
}

.portfolio-item:hover { transform: scale(1.02); }

.portfolio-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.portfolio-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 24px;
  background: linear-gradient(transparent 40%, rgba(0,0,0,0.7));
  color: #fff;
  opacity: 0;
  transition: opacity 200ms ease;
}

.portfolio-item:hover .portfolio-overlay { opacity: 1; }
.portfolio-overlay h3 { font-size: 1.1rem; margin-bottom: 4px; }
.portfolio-overlay p { font-size: 0.85rem; opacity: 0.85; }

/* ─── Contact ─── */
.contact-form {
  max-width: 560px;
  margin: 48px auto 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-form input,
.contact-form textarea {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid #d2d2d7;
  border-radius: 10px;
  font-size: 1rem;
  font-family: inherit;
  background: #fff;
  transition: border-color 180ms ease;
}

.contact-form input:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.contact-form textarea { min-height: 140px; resize: vertical; }

.contact-info {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.contact-info a {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  font-size: 0.95rem;
  transition: color 180ms ease;
}

.contact-info a:hover { color: var(--accent); }

/* ─── Footer ─── */
.site-footer {
  padding: 28px 24px;
  background: var(--surface);
  color: var(--muted);
  text-align: center;
  font-size: 0.88rem;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .nav {
    min-height: auto;
    padding: 14px 0;
    align-items: center;
    flex-wrap: wrap;
  }
  .nav-links {
    width: 100%;
    justify-content: center;
    gap: 4px;
    margin-top: 8px;
  }
  .nav-links a {
    padding: 8px 10px;
    font-size: 0.85rem;
  }
  .hero {
    min-height: auto;
    padding: 60px 20px 48px;
  }
  .hero h1 {
    font-size: clamp(2.2rem, 10vw, 3.5rem);
  }
  .hero-copy {
    font-size: 1rem;
    margin-top: 20px;
  }
  .hero-actions {
    margin-top: 28px;
    flex-direction: column;
    align-items: center;
  }
  .button {
    width: 100%;
    max-width: 280px;
    padding: 14px 22px;
  }
  .section {
    padding: 60px 20px;
  }
  .section h2 {
    font-size: clamp(1.6rem, 6vw, 2.5rem);
  }
  .section p {
    font-size: 1rem;
  }
  .cards-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .card {
    padding: 24px;
  }
  .portfolio-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .portfolio-item {
    aspect-ratio: 16/9;
  }
  .contact-form input,
  .contact-form textarea {
    padding: 16px;
    font-size: 1rem;
  }
  .contact-info {
    flex-direction: column;
    align-items: center;
    gap: 16px;
  }
  .contact-info a {
    font-size: 1rem;
  }
  .site-footer {
    padding: 20px 16px;
  }
}