/* ============================================================
   Lucas Ly Ba — portfolio
   Theme: low-level / systems / compiler — dark terminal aesthetic
   ============================================================ */

:root {
  --bg:        #0a0e14;
  --bg-soft:   #0f141d;
  --panel:     #11161f;
  --panel-2:   #161c27;
  --border:    #1f2733;
  --border-hi: #2b3645;

  --text:      #c9d3df;
  --text-dim:  #7d8a9c;
  --text-mute: #586374;

  --green:     #7ee787;
  --cyan:      #56d4dd;
  --purple:    #d2a8ff;
  --orange:    #ffa657;
  --red:       #ff7b72;
  --yellow:    #f2cc60;
  --blue:      #79c0ff;

  --accent:    var(--green);

  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
  --sans: "Inter", system-ui, -apple-system, sans-serif;

  --maxw: 1080px;
  --r: 12px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  font-family: var(--sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }

/* ---------- background decoration ---------- */
.grid-bg {
  position: fixed; inset: 0; z-index: -2;
  background-image:
    linear-gradient(to right, rgba(86,212,221,.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(86,212,221,.04) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 75%);
}
.grid-bg::after {
  content: ""; position: absolute; inset: 0;
  background:
    radial-gradient(600px 400px at 15% 0%, rgba(126,231,135,.08), transparent 70%),
    radial-gradient(500px 400px at 90% 10%, rgba(210,168,255,.07), transparent 70%);
}
.noise {
  position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: .025;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--maxw); margin: 0 auto;
  padding: 18px 24px;
  backdrop-filter: blur(10px);
}
.nav::before {
  content: ""; position: absolute; inset: 0; z-index: -1;
  background: linear-gradient(180deg, rgba(10,14,20,.85), rgba(10,14,20,.4));
  border-bottom: 1px solid var(--border);
  mask-image: linear-gradient(180deg, #000 60%, transparent);
}
.nav__logo {
  display: inline-flex; align-items: center; gap: 11px;
  font-family: var(--mono);
}
.nav__mark {
  display: inline-grid; place-items: center;
  width: 34px; height: 34px; border-radius: 9px;
  font-weight: 700; font-size: .82rem; letter-spacing: .5px;
  color: var(--green);
  background: linear-gradient(160deg, rgba(126,231,135,.12), rgba(86,212,221,.06));
  border: 1px solid var(--border-hi);
  box-shadow: inset 0 0 12px rgba(126,231,135,.08);
  transition: border-color .2s, box-shadow .2s;
}
.nav__logo:hover .nav__mark {
  border-color: var(--green);
  box-shadow: inset 0 0 14px rgba(126,231,135,.18), 0 0 16px -6px rgba(126,231,135,.5);
}
.nav__wordmark {
  font-size: .82rem; font-weight: 600; letter-spacing: -.2px; color: var(--text-dim);
  transition: color .2s;
}
.nav__logo:hover .nav__wordmark { color: var(--text); }
.nav__links { display: flex; align-items: center; gap: 26px; }
.nav__links a {
  font-family: var(--mono); font-size: .85rem; color: var(--text-dim);
  transition: color .2s;
}
.nav__links a:hover { color: var(--text); }
.nav__cta {
  color: var(--green) !important;
  border: 1px solid var(--border-hi);
  padding: 6px 14px; border-radius: 8px;
  transition: all .2s !important;
}
.nav__cta:hover { background: rgba(126,231,135,.08); border-color: var(--green); }

/* ---------- layout ---------- */
.section {
  max-width: var(--maxw); margin: 0 auto;
  padding: 80px 24px;
}
.section__head {
  display: flex; align-items: center; gap: 16px; margin-bottom: 44px;
}
.section__index {
  font-family: var(--mono); font-size: .9rem; color: var(--green);
  font-weight: 600;
}
.section__title {
  font-family: var(--mono); font-size: 1.5rem; font-weight: 600;
  letter-spacing: -.5px;
}
.section__rule { flex: 1; height: 1px; background: linear-gradient(90deg, var(--border-hi), transparent); }

/* ---------- hero ---------- */
.hero {
  max-width: var(--maxw); margin: 0 auto;
  padding: 70px 24px 60px;
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 48px; align-items: center;
}
.hero__eyebrow {
  font-family: var(--mono); font-size: .8rem; color: var(--text-dim);
  display: inline-flex; align-items: center; gap: 10px; margin-bottom: 22px;
  padding: 9px 16px; border: 1px solid var(--border); border-radius: 16px;
  background: var(--panel);
}
.hero__eyebrow-text { line-height: 1.55; }
.status-dot {
  width: 8px; height: 8px; border-radius: 50%; background: var(--green);
  box-shadow: 0 0 0 0 rgba(126,231,135,.6); animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(126,231,135,.5); }
  70% { box-shadow: 0 0 0 8px rgba(126,231,135,0); }
  100% { box-shadow: 0 0 0 0 rgba(126,231,135,0); }
}
.hero__name {
  font-size: clamp(2.6rem, 6vw, 4.4rem); font-weight: 700; line-height: 1.02;
  letter-spacing: -2px; margin-bottom: 18px;
  background: linear-gradient(180deg, #fff 30%, #9fb0c4);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero__role { font-size: 1.2rem; color: var(--text); margin-bottom: 18px; }
.hero__tagline { font-size: 1.02rem; color: var(--text-dim); max-width: 46ch; }
.kw { color: var(--purple); font-family: var(--mono); font-weight: 600; }
.hl { color: var(--text); font-weight: 600; }
.dim { color: var(--text-mute); }
.acc-green { color: var(--green); } .acc-cyan { color: var(--cyan); }
.acc-orange { color: var(--orange); } .acc-purple { color: var(--purple); }

.hero__actions { display: flex; gap: 14px; margin: 32px 0 28px; flex-wrap: wrap; }
.hero__badges { list-style: none; display: grid; gap: 10px; }
.hero__badges li {
  font-family: var(--mono); font-size: .82rem; color: var(--text-dim);
  display: flex; align-items: center; gap: 10px;
}
.badge-icon { color: var(--green); font-size: .7rem; }

/* ---------- buttons ---------- */
.btn {
  font-family: var(--mono); font-size: .88rem; font-weight: 600;
  padding: 12px 22px; border-radius: 9px; transition: all .2s;
  display: inline-flex; align-items: center; gap: 8px; cursor: pointer;
  border: 1px solid transparent;
}
.btn--primary {
  background: var(--green); color: #07120a;
  box-shadow: 0 0 0 1px rgba(126,231,135,.4), 0 8px 24px -10px rgba(126,231,135,.6);
}
.btn--primary:hover { transform: translateY(-2px); box-shadow: 0 0 0 1px var(--green), 0 12px 28px -10px rgba(126,231,135,.7); }
.btn--ghost {
  background: var(--panel); color: var(--text); border-color: var(--border-hi);
}
.btn--ghost:hover { border-color: var(--green); color: var(--green); transform: translateY(-2px); }

/* ---------- terminal ---------- */
.terminal {
  background: var(--panel); border: 1px solid var(--border-hi); border-radius: var(--r);
  overflow: hidden; box-shadow: 0 30px 60px -25px rgba(0,0,0,.8);
  font-family: var(--mono);
}
.terminal__bar {
  display: flex; align-items: center; gap: 8px;
  padding: 11px 14px; background: var(--panel-2); border-bottom: 1px solid var(--border);
}
.dot { width: 11px; height: 11px; border-radius: 50%; }
.dot--r { background: #ff5f57; } .dot--y { background: #febc2e; } .dot--g { background: #28c840; }
.terminal__title { margin-left: 10px; font-size: .76rem; color: var(--text-mute); }
.terminal__body {
  padding: 20px 22px; font-size: .82rem; line-height: 1.85; overflow-x: auto;
}
.terminal__body code { color: var(--text); }
.t-comment { color: var(--text-mute); font-style: italic; }
.t-kw { color: var(--red); } .t-type { color: var(--orange); }
.t-str { color: var(--cyan); } .t-fn { color: var(--purple); }
.t-bool { color: var(--blue); }
.t-cursor { color: var(--green); animation: blink 1.1s step-end infinite; }
@keyframes blink { 50% { opacity: 0; } }

/* ---------- about ---------- */
.about { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; }
.about__text p { color: var(--text-dim); margin-bottom: 18px; max-width: 62ch; }
.about__text strong { color: var(--text); font-weight: 600; }
.about__facts { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; align-content: start; }
.fact {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--r);
  padding: 18px; transition: border-color .2s, transform .2s;
}
.fact:hover { border-color: var(--border-hi); transform: translateY(-3px); }
.fact__num {
  display: block; font-family: var(--mono); font-size: 1.7rem; font-weight: 700;
  color: var(--green); line-height: 1;
}
.fact__label { display: block; font-size: .76rem; color: var(--text-mute); margin-top: 8px; }

/* ---------- timeline ---------- */
.timeline { list-style: none; position: relative; }
.timeline::before {
  content: ""; position: absolute; left: 168px; top: 8px; bottom: 8px; width: 1px;
  background: var(--border);
}
.entry {
  display: grid; grid-template-columns: 168px 1fr; gap: 40px;
  padding-bottom: 44px; position: relative;
}
.entry__time { text-align: right; padding-right: 8px; }
.entry__date { display: block; font-family: var(--mono); font-size: .8rem; color: var(--text); font-weight: 500; }
.entry__tag { display: inline-block; margin-top: 6px; font-family: var(--mono); font-size: .68rem; color: var(--text-mute); }
.entry__body { position: relative; padding-left: 32px; }
.entry__body::before {
  content: ""; position: absolute; left: -8px; top: 7px; width: 11px; height: 11px;
  border-radius: 50%; background: var(--bg); border: 2px solid var(--green);
  box-shadow: 0 0 12px rgba(126,231,135,.5);
}
.entry__role { font-size: 1.15rem; font-weight: 600; margin-bottom: 4px; }
.entry__org { font-family: var(--mono); font-size: .82rem; color: var(--cyan); margin-bottom: 14px; }
.entry__desc { color: var(--text-dim); margin-bottom: 12px; max-width: 70ch; }
.entry__desc strong { color: var(--text); font-weight: 600; }
.entry__bullets { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 12px; }
.entry__bullets li { font-family: var(--mono); font-size: .8rem; color: var(--text-dim); position: relative; padding-left: 16px; }
.entry__bullets li::before { content: "→"; position: absolute; left: 0; color: var(--green); }
.entry__mentor { font-size: .82rem; color: var(--text-mute); margin-bottom: 12px; font-style: italic; }
.entry__tech { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.entry__tech li {
  font-family: var(--mono); font-size: .72rem; color: var(--text-dim);
  padding: 4px 10px; border: 1px solid var(--border); border-radius: 6px; background: var(--panel);
}
.entry__link { font-family: var(--mono); font-size: .8rem; color: var(--green); transition: opacity .2s; }
.entry__link:hover { opacity: .7; }

/* ---------- project cards ---------- */
.cards { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--r);
  padding: 26px; transition: border-color .2s, transform .2s, box-shadow .2s;
  position: relative; overflow: hidden;
}
.card::before {
  content: ""; position: absolute; inset: 0; opacity: 0; transition: opacity .3s;
  background: radial-gradient(400px 200px at var(--mx,50%) 0%, rgba(126,231,135,.07), transparent 70%);
}
.card:hover { border-color: var(--border-hi); transform: translateY(-4px); box-shadow: 0 24px 40px -28px rgba(0,0,0,.9); }
.card:hover::before { opacity: 1; }
.card__top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
.card__kind { font-family: var(--mono); font-size: .76rem; color: var(--text-mute); }
.card__icon {
  font-family: var(--mono); color: var(--text-dim); font-size: 1rem;
  width: 30px; height: 30px; display: grid; place-items: center;
  border: 1px solid var(--border); border-radius: 7px; transition: all .2s;
}
.card__icon:hover { color: var(--green); border-color: var(--green); }
.card__title { font-family: var(--mono); font-size: 1.2rem; font-weight: 700; margin-bottom: 10px; }
.card__desc { color: var(--text-dim); font-size: .92rem; margin-bottom: 18px; }
.card__tags { list-style: none; display: flex; flex-wrap: wrap; gap: 7px; }
.card__tags li {
  font-family: var(--mono); font-size: .7rem; color: var(--cyan);
  padding: 3px 9px; border-radius: 999px; background: rgba(86,212,221,.07);
  border: 1px solid rgba(86,212,221,.18);
}

/* ---------- also built ---------- */
.more {
  margin-top: 22px; padding: 22px 24px;
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--r);
}
.more__label { font-family: var(--mono); font-size: .76rem; color: var(--text-mute); display: block; margin-bottom: 14px; }
.more__list { list-style: none; display: flex; flex-wrap: wrap; gap: 8px 10px; }
.more__list li {
  font-family: var(--mono); font-size: .76rem; color: var(--text-dim);
  padding: 6px 12px; border: 1px solid var(--border); border-radius: 7px; background: var(--bg-soft);
  transition: all .2s;
}
.more__list li:hover { color: var(--text); border-color: var(--border-hi); }
.more__list code { color: inherit; font-family: inherit; background: none; }

/* ---------- stack ---------- */
.stack { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; }
.stack__group {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--r); padding: 24px;
}
.stack__label { font-family: var(--mono); font-size: .85rem; color: var(--green); margin-bottom: 16px; font-weight: 600; }
.chips { list-style: none; display: flex; flex-wrap: wrap; gap: 8px; }
.chips li {
  font-family: var(--mono); font-size: .78rem; color: var(--text-dim);
  padding: 6px 12px; border: 1px solid var(--border); border-radius: 7px;
  background: var(--bg-soft); transition: all .2s;
}
.chips li:hover { color: var(--text); border-color: var(--border-hi); }

/* ---------- community ---------- */
.community { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.community__item {
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--r);
  padding: 24px; transition: border-color .2s, transform .2s;
}
.community__item:hover { border-color: var(--border-hi); transform: translateY(-3px); }
.community__title { font-size: 1.05rem; font-weight: 600; margin-bottom: 10px; }
.community__desc { color: var(--text-dim); font-size: .92rem; margin-bottom: 14px; }
.community__desc strong { color: var(--text); font-weight: 600; }
.community__years { font-family: var(--mono); font-size: .74rem; color: var(--green); }

/* ---------- contact ---------- */
.section--contact { text-align: center; padding-top: 60px; padding-bottom: 100px; }
.contact { max-width: 620px; margin: 0 auto; }
.contact__kicker { font-family: var(--mono); color: var(--green); font-size: .85rem; margin-bottom: 14px; }
.contact__title {
  font-size: clamp(2.2rem, 5vw, 3.4rem); font-weight: 700; letter-spacing: -1.5px; margin-bottom: 18px;
  background: linear-gradient(180deg, #fff, #9fb0c4);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.contact__text { color: var(--text-dim); margin-bottom: 32px; }
.contact__links { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- footer ---------- */
.footer {
  max-width: var(--maxw); margin: 0 auto; padding: 28px 24px 50px;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  border-top: 1px solid var(--border);
  font-family: var(--mono); font-size: .78rem; color: var(--text-dim);
}
.footer__dim { color: var(--text-mute); }

/* ---------- reveal animation ---------- */
.section, .hero__inner > *, .terminal { will-change: opacity, transform; }
[data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; gap: 36px; padding-top: 40px; }
  .terminal { order: 2; }
  .about { grid-template-columns: 1fr; gap: 28px; }
  .cards { grid-template-columns: 1fr; }
  .stack { grid-template-columns: 1fr; }
  .community { grid-template-columns: 1fr; }
  .nav__links { gap: 16px; }
  .nav__links a:not(.nav__cta) { display: none; }
  .timeline::before { left: 5px; }
  .entry { grid-template-columns: 1fr; gap: 8px; }
  .entry__time { text-align: left; padding-left: 24px; }
  .entry__body { padding-left: 24px; }
  .entry__body::before { left: -19px; }
}
@media (max-width: 480px) {
  .section { padding: 56px 18px; }
  .hero { padding: 30px 18px; }
  .hero__actions { flex-direction: column; }
  .btn { justify-content: center; }
  .nav__wordmark { display: none; }
}