/* ============================================================
   DESIGN TOKENS
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600&family=Outfit:wght@400;600;700;800&display=swap');

:root {
  /* Colors */
  --bg-base:        #080c14;
  --bg-surface:     #0d1526;
  --bg-glass:       rgba(255, 255, 255, 0.04);
  --bg-glass-hover: rgba(255, 255, 255, 0.08);
  --border-glass:   rgba(255, 255, 255, 0.08);
  --border-hover:   rgba(0, 212, 170, 0.4);

  --accent:         #00d4aa;
  --accent-dim:     rgba(0, 212, 170, 0.15);
  --accent-glow:    rgba(0, 212, 170, 0.25);

  --text-primary:   #f0f4f8;
  --text-secondary: #8899aa;
  --text-muted:     #4a5a6a;

  /* Typography */
  --font-body:      'Inter', system-ui, sans-serif;
  --font-display:   'Outfit', system-ui, sans-serif;

  /* Spacing */
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  1.5rem;
  --space-lg:  2.5rem;
  --space-xl:  4rem;
  --space-2xl: 6rem;

  /* Radii */
  --radius-sm:  8px;
  --radius-md:  14px;
  --radius-lg:  20px;
  --radius-full: 9999px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration: 280ms;

  /* Nav height */
  --nav-h: 64px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-base);
  background-image:
    radial-gradient(ellipse 80% 50% at 20% -10%, rgba(0, 212, 170, 0.07) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 110%, rgba(30, 60, 120, 0.15) 0%, transparent 60%);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

img, svg { display: block; }

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  padding: 0 var(--space-lg);
  transition: background var(--duration) var(--ease-out), backdrop-filter var(--duration) var(--ease-out), border-color var(--duration) var(--ease-out);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  background: rgba(8, 12, 20, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom-color: var(--border-glass);
}

.nav__inner {
  width: 100%;
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.nav__logo span { color: var(--accent); }

.nav__links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.nav__links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  padding-bottom: 3px;
}

.nav__links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 2px;
  background: var(--accent);
  border-radius: var(--radius-full);
  transition: width var(--duration) var(--ease-out);
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--text-primary);
}

.nav__links a:hover::after,
.nav__links a.active::after {
  width: 100%;
}

/* ============================================================
   PAGE WRAPPER
   ============================================================ */
.page {
  max-width: 900px;
  margin: 0 auto;
  padding: calc(var(--nav-h) + var(--space-xl)) var(--space-lg) var(--space-2xl);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding: var(--space-xl) 0 var(--space-2xl);
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-sm);
}

.hero__eyebrow .dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2.4s ease-in-out infinite;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

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

.hero__tagline {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text-secondary);
  max-width: 480px;
  line-height: 1.6;
}

/* ============================================================
   SECTION HEADER
   ============================================================ */
.section-header {
  margin-bottom: var(--space-lg);
}

.section-header__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-xs);
}

.section-header__title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--border-glass);
}

.about__body {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 640px;
  line-height: 1.8;
}

.about__body p + p { margin-top: var(--space-sm); }

/* ============================================================
   LINKS ROW (Social + CV)
   ============================================================ */
.links-section {
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--border-glass);
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-sm);
}

.link-card {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.95rem;
  transition: background var(--duration) var(--ease-out),
              border-color var(--duration) var(--ease-out),
              transform var(--duration) var(--ease-out),
              box-shadow var(--duration) var(--ease-out);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.link-card:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px var(--accent-glow);
  color: var(--text-primary);
}

.link-card__icon {
  flex-shrink: 0;
  width: 40px; height: 40px;
  border-radius: var(--radius-sm);
  background: var(--accent-dim);
  display: flex; align-items: center; justify-content: center;
  color: var(--accent);
}

.link-card__icon svg { width: 20px; height: 20px; }

.link-card__meta { display: flex; flex-direction: column; gap: 2px; }
.link-card__label { font-size: 0.78rem; color: var(--text-muted); font-weight: 400; }

/* ============================================================
   PAGE HERO (Projects page)
   ============================================================ */
.page-hero {
  padding: var(--space-xl) 0 var(--space-lg);
  border-bottom: 1px solid var(--border-glass);
  margin-bottom: var(--space-xl);
}

.page-hero__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--space-xs);
}

.page-hero__subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
}

/* ============================================================
   PROJECT CARDS
   ============================================================ */
.posts-grid {
  display: grid;
  gap: var(--space-md);
}

.post-card {
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  transition: background var(--duration) var(--ease-out),
              border-color var(--duration) var(--ease-out),
              transform var(--duration) var(--ease-out),
              box-shadow var(--duration) var(--ease-out);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  cursor: pointer;
}

.post-card:hover {
  background: var(--bg-glass-hover);
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.3), 0 0 0 1px var(--border-hover);
}

.post-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.post-card__tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 3px 10px;
  border-radius: var(--radius-full);
}

.post-card__date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.post-card__title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  line-height: 1.3;
  margin-top: 4px;
}

.post-card__excerpt {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-top: 4px;
}

.post-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-sm);
  padding-top: var(--space-sm);
  border-top: 1px solid var(--border-glass);
}

.post-card__read-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  transition: gap var(--duration) var(--ease-out), color var(--duration) var(--ease-out);
}

.post-card:hover .post-card__read-more { gap: 10px; color: #fff; }

.post-card__read-more svg { width: 16px; height: 16px; }

.post-card__reading-time {
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  margin-top: var(--space-2xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--border-glass);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}

.footer__copy {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer__links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}

.footer__links a {
  font-size: 0.82rem;
  color: var(--text-muted);
  transition: color var(--duration) var(--ease-out);
}

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

/* ============================================================
   SCROLL REVEAL ANIMATION
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered children */
.reveal-group > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s var(--ease-out), transform 0.5s var(--ease-out);
}

.reveal-group.visible > *:nth-child(1) { opacity: 1; transform: translateY(0); transition-delay: 0ms; }
.reveal-group.visible > *:nth-child(2) { opacity: 1; transform: translateY(0); transition-delay: 80ms; }
.reveal-group.visible > *:nth-child(3) { opacity: 1; transform: translateY(0); transition-delay: 160ms; }
.reveal-group.visible > *:nth-child(4) { opacity: 1; transform: translateY(0); transition-delay: 240ms; }

/* ============================================================
   KEYFRAMES
   ============================================================ */
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.5; transform: scale(0.75); }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 640px) {
  .page { padding-inline: var(--space-sm); }
  .nav  { padding-inline: var(--space-sm); }
  .footer { flex-direction: column; align-items: flex-start; }
  .post-card { padding: var(--space-sm) var(--space-md); }
}