/* =========================================================
   PORTFOLIO — styles.css
   Dark theme, IBM Plex Mono + Sora
   Content-first, minimal, production-grade
   ========================================================= */

/* ---- CSS Variables ---- */
:root {
  --bg:        #0d0d0d;
  --bg-card:   #141414;
  --bg-hover:  #1a1a1a;
  --border:    #242424;
  --text:      #c9c9c9;
  --text-dim:  #5a5a5a;
  --text-head: #f0f0f0;
  --accent:    #a8ff57;
  --accent-dim:#6ab832;

  --font-sans: 'Sora', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --max-w: 1080px;
  --nav-h: 64px;

  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-weight: 300;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

/* ---- Utility ---- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}
.mono { font-family: var(--font-mono); }
.accent { color: var(--accent); }
.small { font-size: 0.8rem; }

/* ---- Section Layout ---- */
section {
  padding: 100px 0;
  border-top: 1px solid var(--border);
}
.section-grid {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 0 60px;
  align-items: start;
}
.section-label-col {
  padding-top: 6px;
}
.section-label {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  text-transform: uppercase;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 600;
  color: var(--text-head);
  line-height: 1.25;
  margin-bottom: 40px;
  letter-spacing: -0.02em;
}

/* =========================================================
   NAVBAR
   ========================================================= */
#navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  background: rgba(13, 13, 13, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  z-index: 100;
  transition: border-color 0.3s var(--ease);
}
#navbar.scrolled {
  border-bottom-color: var(--border);
}
.nav-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-head);
  letter-spacing: 0.05em;
  transition: color 0.2s;
}
.nav-logo:hover { color: var(--accent); }
.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav-links a {
  font-size: 0.82rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  letter-spacing: 0.06em;
  transition: color 0.2s var(--ease);
}
.nav-links a:hover { color: var(--text-head); }
.nav-links a.nav-cta {
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 6px 16px;
  border-radius: 2px;
  transition: background 0.2s, color 0.2s;
}
.nav-links a.nav-cta:hover {
  background: var(--accent);
  color: var(--bg);
}
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.nav-toggle span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text);
  transition: transform 0.25s, opacity 0.25s;
}

/* =========================================================
   HERO
   ========================================================= */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  border-top: none;
  position: relative;
  overflow: hidden;
  padding: 0;
}
.hero-inner {
  padding-top: calc(var(--nav-h) + 60px);
  padding-bottom: 80px;
  position: relative;
  z-index: 1;
}
.hero-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 28px;
}
.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  font-weight: 700;
  color: var(--text-head);
  line-height: 1.1;
  letter-spacing: -0.035em;
  margin-bottom: 28px;
}
.hero-sub {
  font-size: clamp(0.95rem, 1.5vw, 1.1rem);
  color: var(--text-dim);
  max-width: 520px;
  line-height: 1.75;
  margin-bottom: 40px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
}
.btn {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  padding: 12px 28px;
  border-radius: 2px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s var(--ease);
  display: inline-block;
}
.btn-primary {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}
.btn-primary:hover {
  background: transparent;
  color: var(--accent);
}
.btn-ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover {
  border-color: var(--text);
  color: var(--text-head);
}
.hero-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-dim);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  letter-spacing: 0.04em;
}
.hero-meta .sep { color: var(--border); }

/* Grid background */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  opacity: 0.3;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 0%, transparent 70%);
}

/* =========================================================
   ABOUT
   ========================================================= */
#about {}
.about-body p {
  margin-bottom: 20px;
  font-size: 0.97rem;
  line-height: 1.8;
  color: var(--text);
  max-width: 600px;
}
.about-body p:last-child { margin-bottom: 0; }
.about-stats {
  display: flex;
  gap: 48px;
  margin-top: 48px;
  flex-wrap: wrap;
}
.stat {}
.stat-num {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  font-family: var(--font-mono);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label {
  font-size: 0.76rem;
  font-family: var(--font-mono);
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  max-width: 140px;
  display: block;
  line-height: 1.5;
}

/* =========================================================
   STACK
   ========================================================= */
#stack {}
.stack-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px 48px;
}
.stack-category {}
.stack-cat-title {
  font-size: 0.72rem;
  font-family: var(--font-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.stack-list li {
  font-size: 0.875rem;
  color: var(--text);
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 10px;
  line-height: 1.4;
}
.stack-list li:last-child { border-bottom: none; }
.tag {
  font-size: 0.68rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  color: var(--text-head);
  padding: 2px 8px;
  border-radius: 2px;
  white-space: nowrap;
  letter-spacing: 0.04em;
}

/* =========================================================
   PROJECTS
   ========================================================= */
#projects {}
.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 36px;
  margin-bottom: 24px;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.project-card:hover {
  border-color: #333;
  background: var(--bg-hover);
}
.project-card:last-child { margin-bottom: 0; }
.project-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 16px;
}
.project-num {
  font-size: 0.68rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  display: block;
  margin-bottom: 6px;
}
.project-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-head);
  letter-spacing: -0.01em;
}
.project-tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}
.project-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 24px;
}
.project-block h4 {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 10px;
}
.project-block p {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--text);
}

/* =========================================================
   EXPERIENCE
   ========================================================= */
#experience {}
.exp-blocks {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.exp-block {
  display: flex;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
  transition: background 0.2s;
}
.exp-block:first-child { border-top: 1px solid var(--border); }
.exp-icon {
  color: var(--accent);
  font-size: 0.9rem;
  padding-top: 3px;
  flex-shrink: 0;
  line-height: 1;
}
.exp-block h3 {
  font-size: 0.97rem;
  font-weight: 600;
  color: var(--text-head);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}
.exp-block p {
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--text);
  max-width: 580px;
}

/* =========================================================
   CONTACT
   ========================================================= */
#contact {
  border-bottom: 1px solid var(--border);
}
.contact-inner {
  max-width: 600px;
}
.contact-inner .section-label {
  display: block;
  margin-bottom: 24px;
}
.contact-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--text-head);
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 20px;
}
.contact-sub {
  font-size: 0.95rem;
  color: var(--text-dim);
  line-height: 1.75;
  margin-bottom: 40px;
  max-width: 480px;
}
.contact-links {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.contact-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
  transition: color 0.2s, border-color 0.2s;
}
.contact-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}
.contact-link svg {
  transition: transform 0.2s;
}
.contact-link:hover svg {
  transform: translate(2px, -2px);
}

/* =========================================================
   FOOTER
   ========================================================= */
footer {
  padding: 28px 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

/* =========================================================
   SCROLL REVEAL (JS-triggered)
   ========================================================= */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* =========================================================
   MOBILE NAV
   ========================================================= */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-h);
    left: 0; right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    padding: 16px 0;
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    padding: 14px 24px;
    width: 100%;
    display: block;
    border-bottom: 1px solid var(--border);
  }
  .nav-links a.nav-cta {
    border: none;
    border-bottom: 1px solid var(--border);
    border-radius: 0;
  }
  .nav-toggle { display: flex; }
}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width: 900px) {
  .section-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .section-label-col { padding-top: 0; }
  .project-grid { grid-template-columns: 1fr; gap: 20px; }
  .stack-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  section { padding: 72px 0; }
  .project-card { padding: 24px 20px; }
  .project-header { flex-direction: column; }
  .about-stats { gap: 28px; }
  .footer-inner { flex-direction: column; gap: 8px; text-align: center; }
  .hero-actions { flex-direction: column; }
  .btn { text-align: center; }
}