/* ============================================================
   ElectroMind AI — site stylesheet
   Dark, editorial look: serif display headings (Fraunces),
   monospace details (JetBrains Mono), circuit-green accent.
   ============================================================ */

:root {
  --bg: #0b0f0e;
  --bg-soft: #101614;
  --bg-card: #0e1412;
  --ink: #e8f0ec;
  --ink-dim: #93a49c;
  --ink-faint: #5c6d65;
  --line: #1e2a25;
  --accent: #34d399;
  --accent-dim: #1f7a58;
  --accent-soft: rgba(52, 211, 153, 0.12);
  --serif: "Fraunces", Georgia, "Times New Roman", serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: "Inter", system-ui, -apple-system, sans-serif;
  --radius: 14px;
  --maxw: 1080px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

::selection { background: var(--accent-dim); color: #fff; }

img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code {
  font-family: var(--mono);
  font-size: 0.86em;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 0.1em 0.4em;
  color: #a7d7c3;
}

h1, h2, h3, h4 {
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.72rem 1.5rem;
  border-radius: 10px;
  border: 1px solid var(--line);
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease, border-color 0.15s ease;
  cursor: pointer;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }

.btn--solid {
  background: var(--accent);
  border-color: var(--accent);
  color: #06281a;
  font-weight: 600;
}
.btn--solid:hover { box-shadow: 0 6px 24px rgba(52, 211, 153, 0.25); }

.btn--ghost {
  color: var(--ink);
  background: transparent;
}
.btn--ghost:hover { border-color: var(--accent-dim); background: var(--accent-soft); }

/* ---------- Nav ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(11, 15, 14, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0.8rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}
.nav__brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--serif);
  font-size: 1.15rem;
  color: var(--ink);
  font-weight: 600;
}
.nav__brand:hover { text-decoration: none; }
.nav__logo { width: 30px; height: 30px; }
.nav__links {
  display: flex;
  gap: 1.4rem;
  margin-left: auto;
}
.nav__links a {
  color: var(--ink-dim);
  font-size: 0.92rem;
  font-weight: 500;
  transition: color 0.15s;
}
.nav__links a:hover { color: var(--ink); text-decoration: none; }
.nav__cta { margin-left: 0.5rem; padding: 0.5rem 1.1rem; font-size: 0.82rem; }
.nav__burger {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 6px;
}
.nav__burger span {
  width: 20px;
  height: 2px;
  background: var(--ink);
  transition: transform 0.2s, opacity 0.2s;
}
.nav__burger.open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav__burger.open span:nth-child(2) { opacity: 0; }
.nav__burger.open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  max-width: 860px;
  margin: 0 auto;
  padding: 6.5rem 1.5rem 5rem;
  text-align: center;
  overflow: hidden;
}
.hero__circuit { position: absolute; inset: 0; pointer-events: none; }
.circuit-line {
  position: absolute;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(52, 211, 153, 0.35), transparent);
  width: 55%;
}
.circuit-line--1 { top: 22%; left: -5%; transform: rotate(-8deg); }
.circuit-line--2 { top: 60%; right: -8%; width: 48%; transform: rotate(6deg); }
.circuit-line--3 { top: 85%; left: 25%; width: 40%; transform: rotate(-3deg); }

.hero__eyebrow {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--accent);
  letter-spacing: 0.04em;
  margin-bottom: 1.6rem;
}
.hero h1 {
  font-size: clamp(2.6rem, 6.5vw, 4.4rem);
  font-weight: 500;
  margin-bottom: 1.4rem;
}
.hero__sub {
  font-size: 1.13rem;
  color: var(--ink-dim);
  max-width: 640px;
  margin: 0 auto 1.2rem;
}
.hero__sub em { color: var(--ink); font-style: italic; }
.hero__privacy {
  font-family: var(--mono);
  font-size: 0.82rem;
  color: var(--ink-faint);
  margin-bottom: 2.2rem;
}
.hero__actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1.6rem;
}
.hero__meta {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
}
.hero__meta code { border: 0; background: none; padding: 0; color: var(--ink-dim); }

/* ---------- Stats ---------- */
.stats { border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.stats__grid {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.stat {
  padding: 2.2rem 1.5rem;
  border-left: 1px solid var(--line);
}
.stat:first-child { border-left: 0; }
.stat__value {
  font-family: var(--serif);
  font-size: 2.6rem;
  color: var(--ink);
  line-height: 1;
  margin-bottom: 0.5rem;
}
.stat__unit { font-size: 1.1rem; color: var(--accent); }
.stat__label {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
  line-height: 1.55;
}

/* ---------- Sections ---------- */
.section {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 5.5rem 1.5rem;
}
.section--alt {
  max-width: none;
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.section--alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.section--alt > .section__head { padding-top: 5.5rem; }

.section__head { text-align: center; max-width: 720px; margin: 0 auto 3.5rem; }
.section__head h2 { font-size: clamp(1.9rem, 4vw, 2.8rem); margin-bottom: 0.8rem; }
.section__head p { color: var(--ink-dim); font-size: 1.02rem; }
.section__head--sub { margin-top: 4.5rem; margin-bottom: 2.2rem; }
.h3-like { font-size: 1.5rem; }

.tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(52, 211, 153, 0.25);
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  margin-bottom: 1rem;
}

/* ---------- Feature blocks ---------- */
.feature-blocks { display: flex; flex-direction: column; gap: 5rem; }
.feature-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}
.feature-block--flip .feature-block__text { order: 2; }
.feature-block--flip .feature-block__code { order: 1; }
.feature-block h3 { font-size: 1.7rem; margin-bottom: 0.9rem; }
.feature-block p { color: var(--ink-dim); }
.feature-block p strong { color: var(--ink); }

.ticks {
  list-style: none;
  margin-top: 1.3rem;
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}
.ticks li {
  padding-left: 1.5rem;
  position: relative;
  color: var(--ink-dim);
  font-size: 0.95rem;
}
.ticks li::before {
  content: "✔";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.8rem;
  top: 0.2em;
}

/* ---------- Code cards ---------- */
.code-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}
.code-card__bar {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0.7rem 1rem;
  border-bottom: 1px solid var(--line);
  background: var(--bg-soft);
}
.code-card__bar i {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--line);
}
.code-card__bar i:first-child { background: #2dd4a0; }
.code-card__bar span {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-faint);
}
.code-card pre {
  padding: 1.2rem 1.3rem;
  font-family: var(--mono);
  font-size: 0.84rem;
  line-height: 1.7;
  overflow-x: auto;
  color: #cfe4da;
}
.code-card--cmd pre { padding: 1rem 1.2rem; }
.code-card .c { color: var(--ink-faint); font-style: italic; }
.code-card .k { color: var(--accent); }
.code-card .ok { color: var(--accent); }

.copy-btn {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-dim);
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 0.25rem 0.6rem;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  z-index: 2;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent-dim); }
.copy-btn.copied { color: var(--accent); border-color: var(--accent-dim); }

/* ---------- Pipeline (how it works) ---------- */
.pipeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.2rem;
}
.pipe {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.6rem 1.4rem;
  position: relative;
  transition: border-color 0.2s, transform 0.2s;
}
.pipe:hover { border-color: var(--accent-dim); transform: translateY(-3px); }
.pipe__num {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  margin-bottom: 0.8rem;
  letter-spacing: 0.1em;
}
.pipe h3 { font-size: 1.15rem; margin-bottom: 0.55rem; }
.pipe p { font-size: 0.88rem; color: var(--ink-dim); }

/* ---------- Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}
.skill-card {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.3rem 1.4rem;
  transition: border-color 0.2s, transform 0.2s;
}
.skill-card:hover { border-color: var(--accent-dim); transform: translateY(-3px); }
.skill-card h4 { font-size: 1.02rem; margin-bottom: 0.6rem; }
.skill-card__icon { margin-right: 0.35rem; }
.skill-card p {
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.8;
  color: var(--ink-dim);
}
.skill-card--accent {
  border-color: var(--accent-dim);
  background: var(--accent-soft);
}
.skills-note {
  max-width: 760px;
  margin: 2.2rem auto 0;
  text-align: center;
  color: var(--ink-dim);
  font-size: 0.95rem;
  line-height: 1.7;
}
.skills-note strong { color: var(--ink); }
.skills-showcase { max-width: 640px; margin: 2.6rem auto 0; }

/* ---------- Architecture ---------- */
.arch {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.2rem;
}
.arch__item {
  border-left: 2px solid var(--accent-dim);
  padding: 0.2rem 0 0.2rem 1.2rem;
}
.arch__item h4 { font-size: 1.05rem; margin-bottom: 0.5rem; }
.arch__item h4 code { background: none; border: 0; padding: 0; color: var(--accent); font-size: 1em; }
.arch__item p { font-size: 0.9rem; color: var(--ink-dim); }

/* ---------- Steps ---------- */
.steps {
  display: flex;
  flex-direction: column;
  gap: 2.4rem;
  max-width: 760px;
  margin: 0 auto;
}
.step__head {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  margin-bottom: 0.7rem;
}
.step__num {
  font-family: var(--mono);
  font-size: 0.85rem;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--accent);
  border: 1px solid var(--accent-dim);
  background: var(--accent-soft);
  flex-shrink: 0;
}
.step h3 { font-size: 1.35rem; }
.step p { color: var(--ink-dim); margin-bottom: 0.9rem; }
.step p strong { color: var(--ink); }

.ol-steps {
  margin: 0.8rem 0 0 0;
  padding-left: 1.4rem;
  color: var(--ink-dim);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.ol-steps strong { color: var(--ink); }

.fineprint {
  max-width: 760px;
  margin: 3rem auto 0;
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-faint);
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 1rem 1.3rem;
  line-height: 1.7;
}

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}
.faq {
  border-bottom: 1px solid var(--line);
}
.faq summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.15rem 0.2rem;
  font-weight: 600;
  font-size: 0.98rem;
  color: var(--ink);
  transition: color 0.15s;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary:hover { color: var(--accent); }
.faq__chev { color: var(--ink-faint); transition: transform 0.2s; font-size: 0.9rem; }
.faq[open] .faq__chev { transform: rotate(180deg); }
.faq p {
  color: var(--ink-dim);
  font-size: 0.93rem;
  padding: 0 0.2rem 1.2rem;
  max-width: 680px;
}

/* ---------- Footer ---------- */
.footer {
  border-top: 1px solid var(--line);
  background: var(--bg-soft);
}
.footer__inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 3.2rem 1.5rem 2.4rem;
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 3rem;
}
.footer__brand {
  display: flex;
  gap: 0.9rem;
  align-items: flex-start;
}
.footer__logo { width: 42px; height: 42px; }
.footer__brand strong { font-family: var(--serif); font-size: 1.15rem; }
.footer__brand p { color: var(--ink-dim); font-size: 0.9rem; margin-top: 0.3rem; }
.footer__cols { display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }
.footer__col h5 {
  font-family: var(--mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-faint);
  margin-bottom: 0.9rem;
}
.footer__col a {
  display: block;
  color: var(--ink-dim);
  font-size: 0.9rem;
  padding: 0.18rem 0;
}
.footer__col p { color: var(--ink-dim); font-size: 0.9rem; }
.footer__bottom {
  border-top: 1px solid var(--line);
  padding: 1.2rem 1.5rem;
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--ink-faint);
}
.footer__bottom strong { color: var(--ink-dim); }

/* ---------- Reveal animation ---------- */
/* Hidden state only applies when JS is running (html.js) — no-JS visitors see everything. */
html.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
html.js .reveal.visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
html.js .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .feature-block { grid-template-columns: 1fr; gap: 1.6rem; }
  .feature-block--flip .feature-block__text { order: 1; }
  .feature-block--flip .feature-block__code { order: 2; }
  .pipeline { grid-template-columns: repeat(2, 1fr); }
  .stats__grid { grid-template-columns: repeat(2, 1fr); }
  .stat { border-left: 0; border-top: 1px solid var(--line); }
  .stat:nth-child(-n+2) { border-top: 0; }
  .stat:nth-child(even) { border-left: 1px solid var(--line); }
  .arch { grid-template-columns: 1fr; gap: 1.4rem; }
  .skills-grid { grid-template-columns: repeat(2, 1fr); }
  .footer__inner { grid-template-columns: 1fr; gap: 2rem; }
}

@media (max-width: 640px) {
  .nav__links, .nav__cta { display: none; }
  .nav__burger { display: flex; margin-left: auto; }
  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(11, 15, 14, 0.97);
    border-bottom: 1px solid var(--line);
    padding: 1rem 1.5rem;
    gap: 0.9rem;
  }
  .pipeline { grid-template-columns: 1fr; }
  .skills-grid { grid-template-columns: 1fr; }
  .stats__grid { grid-template-columns: 1fr; }
  .stat:nth-child(even) { border-left: 0; }
  .stat:nth-child(n+2) { border-top: 1px solid var(--line); }
  .stat:nth-child(-n+2) { border-top: 1px solid var(--line); }
  .stat:nth-child(-n+1) { border-top: 0; }
  .hero { padding-top: 4.5rem; }
  .hero h1 { font-size: 2.5rem; }
}