/* ===========================
   Variables
   =========================== */
:root {
  --bg: #ffffff;
  --surface: #f8fafc;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;

  --dark-bg: #0f172a;
  --dark-surface: #1e293b;
  --dark-border: rgba(255, 255, 255, 0.08);
  --dark-text: #f1f5f9;
  --dark-muted: #94a3b8;

  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --max-width: 960px;
  --radius: 10px;
}

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

html {
  scroll-behavior: smooth;
}

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

a {
  text-decoration: none;
}

/* ===========================
   Nav
   =========================== */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 58px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  color: var(--text);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 2rem;
}

nav ul a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted);
  transition: color 0.15s;
}

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

/* ===========================
   Hero
   =========================== */
#hero {
  background-color: var(--dark-bg);
  background-image: radial-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 28px 28px;
  padding: 7rem 1.5rem 7.5rem;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.25rem;
}

#hero h1 {
  font-size: clamp(3.25rem, 9vw, 6rem);
  font-weight: 800;
  color: var(--dark-text);
  line-height: 1.0;
  letter-spacing: -0.04em;
  margin-bottom: 1.1rem;
}

.hero-subtitle {
  font-size: clamp(1rem, 2.5vw, 1.2rem);
  font-weight: 500;
  color: var(--dark-muted);
  margin-bottom: 0.75rem;
}

.hero-tagline {
  font-size: 0.975rem;
  color: var(--dark-muted);
  max-width: 52ch;
  line-height: 1.75;
  margin-bottom: 2.75rem;
  opacity: 0.85;
}

.hero-cta {
  display: flex;
  gap: 0.875rem;
  flex-wrap: wrap;
}

/* ===========================
   Hero variants
   =========================== */
.hero-short {
  min-height: calc(100vh - 58px - 65px);
  display: flex;
  align-items: center;
}

/* ===========================
   Section layout
   =========================== */
section {
  padding: 5rem 1.5rem;
}

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

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

h2 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.025em;
  margin-bottom: 1.75rem;
}

/* ===========================
   About
   =========================== */
.about-body {
  border-left: 3px solid var(--accent);
  padding-left: 1.5rem;
}

.about-body p {
  font-size: 1.05rem;
  color: var(--muted);
  line-height: 1.85;
  max-width: 66ch;
}

/* ===========================
   Cards
   =========================== */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 1.4rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.07);
}

.card h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.6rem;
  letter-spacing: -0.01em;
}

.card p {
  font-size: 0.855rem;
  color: var(--muted);
  line-height: 1.7;
}

/* ===========================
   Tech tags
   =========================== */
.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tag {
  display: inline-block;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.775rem;
  font-weight: 500;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  transition: border-color 0.15s, color 0.15s;
}

.tag:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* ===========================
   Buttons
   =========================== */
.btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  padding: 0.625rem 1.35rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 600;
  transition: background 0.15s, transform 0.15s;
}

.btn:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--dark-muted);
  border: 1px solid var(--dark-border);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--dark-text);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}

.btn-secondary:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-1px);
}

/* ===========================
   Contact
   =========================== */
.contact-inner {
  max-width: 580px;
  margin: 0 auto;
  text-align: center;
}

.contact-inner p {
  color: var(--muted);
  font-size: 1rem;
  margin-bottom: 0;
}

.contact-links {
  display: flex;
  gap: 0.875rem;
  margin-top: 2rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===========================
   Footer
   =========================== */
footer {
  background: var(--dark-bg);
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--dark-border);
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo-light {
  color: var(--dark-text);
}

footer p {
  font-size: 0.8rem;
  color: var(--dark-muted);
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 720px) {
  .grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 500px) {
  nav ul {
    gap: 1.25rem;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .footer-inner {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
  }
}