/* ── Reset & base ─────────────────────────────────────────────── */
/* ── 404 ─────────────────────────────────────────────────────── */
.not-found {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 64px);
  text-align: center;
  padding: 4rem 1.5rem;
}

.not-found-code {
  font-family: var(--font-mono);
  font-size: clamp(5rem, 16vw, 10rem);
  font-weight: 700;
  color: var(--accent);
  line-height: 1;
  margin-bottom: 1rem;
  opacity: 0.15;
  user-select: none;
}

.not-found-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  color: #fff;
  margin-bottom: 1rem;
}

.not-found-sub {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 420px;
  margin-bottom: 2.5rem;
}

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

:root {
  --bg:          #0d0f14;
  --bg-alt:      #111318;
  --surface:     #181b22;
  --border:      #252932;
  --accent:      #5b8af0;
  --accent-dim:  #3a5fb5;
  --accent-glow: rgba(91, 138, 240, 0.18);
  --text:        #dde3ef;
  --text-muted:  #7a82a0;
  --green:       #3ecf8e;
  --yellow:      #f0b429;
  --font-mono:   'JetBrains Mono', 'Fira Code', monospace;
  --font-sans:   'Inter', system-ui, sans-serif;
  --radius:      10px;
  --max-w:       1100px;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.7;
  min-height: 100vh;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: #fff; }

/* ── Layout ───────────────────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ── Header ───────────────────────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 15, 20, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: #fff;
}

.logo-bracket { color: var(--accent); }

nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

nav a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.15s;
}

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

.btn-nav {
  background: var(--accent);
  color: #fff !important;
  padding: 0.4rem 1rem;
  border-radius: var(--radius);
  font-size: 0.85rem;
  font-weight: 600;
  transition: background 0.15s, transform 0.1s;
}

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

/* ── Buttons ──────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.7rem 1.5rem;
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-weight: 600;
  transition: background 0.15s, transform 0.1s, box-shadow 0.15s;
  cursor: pointer;
  text-decoration: none;
}

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

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:hover {
  background: var(--accent-dim);
  box-shadow: 0 0 28px var(--accent-glow);
  color: #fff;
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
  color: #fff;
}

/* ── Hero ─────────────────────────────────────────────────────── */
.hero {
  position: relative;
  padding: 6rem 0 5rem;
  overflow: hidden;
  text-align: center;
}

.hero-grid-bg {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.3;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 40%, transparent 100%);
}

.hero-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  margin-bottom: 1.5rem;
  letter-spacing: 0.02em;
}

.hero h1 {
  font-size: clamp(2.4rem, 5vw, 3.8rem);
  font-weight: 700;
  line-height: 1.15;
  margin-bottom: 1.25rem;
  color: #fff;
}

.highlight {
  color: var(--accent);
  position: relative;
}

.hero-sub {
  max-width: 640px;
  margin: 0 auto 2.5rem;
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ── Sections ─────────────────────────────────────────────────── */
.section {
  padding: 5rem 0;
}

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

.section-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 3rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  display: block;
  margin-top: 0.5rem;
  height: 3px;
  width: 48px;
  background: var(--accent);
  border-radius: 2px;
}

/* ── About cards ──────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: border-color 0.2s, transform 0.2s;
}

.about-card:hover {
  border-color: var(--accent);
  transform: translateY(-3px);
}

.card-icon {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.about-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
  margin-bottom: 0.6rem;
}

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

/* ── Projects ─────────────────────────────────────────────────── */
.projects-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.project-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem 2rem;
  transition: border-color 0.2s;
}

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

.project-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}

.project-header h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
}

.project-badge {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.badge-active {
  background: rgba(62, 207, 142, 0.12);
  color: var(--green);
  border: 1px solid rgba(62, 207, 142, 0.3);
}

.badge-archived {
  background: rgba(240, 180, 41, 0.1);
  color: var(--yellow);
  border: 1px solid rgba(240, 180, 41, 0.25);
}

.project-item p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
}

.project-link {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--accent);
  transition: color 0.15s;
}

.project-link:hover { color: #fff; }

/* ── CTA ──────────────────────────────────────────────────────── */
.cta-section {
  text-align: center;
}

.cta-inner h2 {
  font-size: 1.9rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.75rem;
}

.cta-inner p {
  color: var(--text-muted);
  margin-bottom: 2rem;
}

/* ── Footer ───────────────────────────────────────────────────── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem 0;
  background: var(--bg);
}

.site-footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.logo-small {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-muted);
}

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

/* ── Responsive ───────────────────────────────────────────────── */
@media (max-width: 600px) {
  nav { gap: 1rem; }
  nav a:not(.btn-nav) { display: none; }
  .hero { padding: 4rem 0 3.5rem; }
}