/* =========================================================
   PulseGrid — Landing Page
   Design tokens
   ========================================================= */
:root {
  /* Color */
  --color-paper: #F2F4F9;
  --color-surface: #FFFFFF;
  --color-ink: #10152B;
  --color-muted: #5B6478;
  --color-line: #DBDFEA;
  --color-signal: #FF4426;   /* alert / primary accent */
  --color-signal-dim: #FFE4DC;
  --color-volt: #2547FF;     /* secondary accent */
  --color-volt-dim: #E4E9FF;
  --color-ok: #17A673;

  /* Type */
  --font-display: 'Space Grotesk', ui-sans-serif, sans-serif;
  --font-body: 'Inter', ui-sans-serif, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  /* Layout */
  --container: 1140px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --nav-h: 76px;
}

/* =========================================================
   Reset
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { margin: 0; padding: 0; list-style: none; }
button { font: inherit; cursor: pointer; }
h1, h2, h3, h4 { font-family: var(--font-display); margin: 0; line-height: 1.15; color: var(--color-ink); }
p { margin: 0; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

:focus-visible {
  outline: 2px solid var(--color-volt);
  outline-offset: 2px;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* =========================================================
   Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
  white-space: nowrap;
}
.btn:hover { transform: translateY(-1px); }
.btn--primary { background: var(--color-ink); color: var(--color-paper); }
.btn--primary:hover { background: var(--color-signal); }
.btn--ghost { color: var(--color-ink); padding-left: 10px; padding-right: 10px; }
.btn--ghost:hover { color: var(--color-volt); }
.btn--outline { border-color: var(--color-line); color: var(--color-ink); background: transparent; }
.btn--outline:hover { border-color: var(--color-ink); }
.btn--lg { padding: 15px 28px; font-size: 1rem; }

/* =========================================================
   Nav
   ========================================================= */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  background: rgba(242, 244, 249, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.nav.is-scrolled {
  border-bottom-color: var(--color-line);
  box-shadow: 0 2px 24px rgba(16, 21, 43, 0.05);
}
.nav__inner {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.nav__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}
.nav__logo-mark {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-signal);
  box-shadow: 0 0 0 4px var(--color-signal-dim);
}
.nav__links {
  display: flex;
  gap: 32px;
  font-size: 0.94rem;
  font-weight: 500;
}
.nav__links a { color: var(--color-muted); transition: color 0.15s ease; }
.nav__links a:hover { color: var(--color-ink); }
.nav__actions { display: flex; align-items: center; gap: 6px; }
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
}
.nav__toggle span {
  display: block;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

/* =========================================================
   Section labels / titles (shared)
   ========================================================= */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-muted);
  margin: 0 0 20px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.eyebrow__dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--color-ok);
  box-shadow: 0 0 0 3px rgba(23, 166, 115, 0.18);
  animation: blink 2.4s ease-in-out infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }

.section-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-signal);
  margin: 0 0 14px;
}
.section-label--center { text-align: center; }
.section-title {
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  text-align: center;
  max-width: 640px;
  margin: 0 auto 56px;
  letter-spacing: -0.01em;
}

/* =========================================================
   Hero
   ========================================================= */
.hero { padding: 96px 0 80px; }
.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}
.hero__title {
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  letter-spacing: -0.02em;
  margin-bottom: 22px;
}
.hero__sub {
  color: var(--color-muted);
  font-size: 1.08rem;
  max-width: 46ch;
  margin-bottom: 32px;
}
.hero__actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 16px; }
.hero__note { font-family: var(--font-mono); font-size: 0.82rem; color: var(--color-muted); }

.pulse-card {
  background: var(--color-ink);
  color: var(--color-paper);
  border-radius: var(--radius-lg);
  padding: 28px 26px 22px;
  box-shadow: 0 30px 60px -20px rgba(16, 21, 43, 0.35);
}
.pulse-card__head {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: rgba(242, 244, 249, 0.7);
  margin-bottom: 18px;
}
.pulse-card__status {
  color: var(--color-ok);
  display: flex;
  align-items: center;
  gap: 6px;
}
.pulse-card__status::before {
  content: "";
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--color-ok);
}
.pulse-line { width: 100%; height: 100px; overflow: visible; }
.pulse-line__path {
  fill: none;
  stroke: var(--color-signal);
  stroke-width: 2.5;
  stroke-linejoin: round;
  stroke-linecap: round;
  stroke-dasharray: 1000;
  stroke-dashoffset: 1000;
  animation: draw-pulse 3.5s linear infinite;
}
@keyframes draw-pulse {
  0% { stroke-dashoffset: 1000; }
  70% { stroke-dashoffset: 0; }
  100% { stroke-dashoffset: 0; }
}
.pulse-card__foot {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  color: rgba(242, 244, 249, 0.7);
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(242, 244, 249, 0.12);
}
.pulse-card__foot b { color: var(--color-paper); }

/* =========================================================
   Section divider (signature motif)
   ========================================================= */
.divider {
  position: relative;
  height: 2px;
  background: var(--color-line);
  margin: 0 auto;
  max-width: var(--container);
  overflow: visible;
}
.divider__blip {
  position: absolute;
  top: 50%;
  left: -6px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-signal);
  transform: translateY(-50%);
  box-shadow: 0 0 0 4px var(--color-signal-dim);
  animation: travel 6s linear infinite;
}
@keyframes travel {
  0% { left: -6px; }
  100% { left: 100%; }
}

/* =========================================================
   About
   ========================================================= */
.about { padding: 88px 0; }
.about__grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
}
.about__lead h2 { font-size: clamp(1.7rem, 3vw, 2.2rem); letter-spacing: -0.01em; }
.about__body p { color: var(--color-muted); margin-bottom: 16px; max-width: 56ch; }
.stat-row {
  display: flex;
  gap: 40px;
  margin-top: 28px;
  flex-wrap: wrap;
}
.stat { display: flex; flex-direction: column; gap: 4px; }
.stat__num { font-family: var(--font-mono); font-size: 1.7rem; font-weight: 500; color: var(--color-ink); }
.stat__label { font-size: 0.85rem; color: var(--color-muted); }

/* =========================================================
   Services
   ========================================================= */
.services { padding: 88px 0; }
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.service-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  transition: border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}
.service-card:hover {
  border-color: var(--color-ink);
  transform: translateY(-3px);
  box-shadow: 0 16px 32px -18px rgba(16, 21, 43, 0.25);
}
.service-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px; height: 34px;
  border-radius: 8px;
  background: var(--color-volt-dim);
  color: var(--color-volt);
  font-size: 0.9rem;
  margin-bottom: 18px;
}
.service-card h3 { font-size: 1.08rem; margin-bottom: 10px; }
.service-card p { color: var(--color-muted); font-size: 0.94rem; }

/* =========================================================
   Testimonials
   ========================================================= */
.testimonials { padding: 88px 0; }
.testimonials__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.testimonial-card {
  margin: 0;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 28px 24px;
  border-top: 3px solid var(--color-signal);
}
.testimonial-card blockquote {
  margin: 0 0 24px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.4;
  letter-spacing: -0.005em;
}
.testimonial-card figcaption { display: flex; align-items: center; gap: 12px; }
.testimonial-card figcaption b { display: block; font-size: 0.92rem; }
.testimonial-card figcaption small { color: var(--color-muted); font-size: 0.82rem; }
.avatar {
  width: 38px; height: 38px;
  border-radius: 50%;
  background: var(--color-ink);
  color: var(--color-paper);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  flex-shrink: 0;
}

/* =========================================================
   FAQ
   ========================================================= */
.faq { padding: 88px 0; }
.faq__grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 56px;
}
.faq__lead h2 { font-size: clamp(1.7rem, 3vw, 2.2rem); letter-spacing: -0.01em; margin-bottom: 14px; }
.faq__note { color: var(--color-muted); font-size: 0.94rem; }
.faq__note a { color: var(--color-volt); font-weight: 600; }

.faq-item { border-bottom: 1px solid var(--color-line); }
.faq-item__q {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: none;
  border: none;
  text-align: left;
  padding: 20px 2px;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  color: var(--color-ink);
}
.faq-item__icon {
  position: relative;
  flex-shrink: 0;
  width: 18px; height: 18px;
}
.faq-item__icon::before, .faq-item__icon::after {
  content: "";
  position: absolute;
  top: 50%; left: 50%;
  background: var(--color-ink);
  transform: translate(-50%, -50%);
  transition: transform 0.2s ease;
}
.faq-item__icon::before { width: 12px; height: 2px; }
.faq-item__icon::after { width: 2px; height: 12px; }
.faq-item__q[aria-expanded="true"] .faq-item__icon::after { transform: translate(-50%, -50%) rotate(90deg); opacity: 0; }
.faq-item__q[aria-expanded="true"] .faq-item__icon::before { background: var(--color-signal); }

.faq-item__a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.25s ease;
}
.faq-item__a > p {
  overflow: hidden;
  color: var(--color-muted);
  padding-right: 34px;
  max-width: 58ch;
}
.faq-item__q[aria-expanded="true"] + .faq-item__a { grid-template-rows: 1fr; }
.faq-item__a > p { min-height: 0; }
.faq-item__q[aria-expanded="true"] + .faq-item__a > p { padding-bottom: 20px; }

/* =========================================================
   CTA
   ========================================================= */
.cta { padding: 90px 0 100px; text-align: center; }
.cta__inner { max-width: 560px; margin: 0 auto; }
.cta h2 { font-size: clamp(1.8rem, 3.4vw, 2.4rem); margin-bottom: 14px; letter-spacing: -0.01em; }
.cta p { color: var(--color-muted); margin-bottom: 30px; }

/* =========================================================
   Footer
   ========================================================= */
.footer { background: var(--color-ink); color: rgba(242, 244, 249, 0.7); padding: 64px 0 0; }
.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
}
.nav__logo--footer { color: var(--color-paper); margin-bottom: 12px; }
.footer__brand p { font-size: 0.9rem; max-width: 30ch; }
.footer__col h4 { color: var(--color-paper); font-size: 0.85rem; margin-bottom: 16px; letter-spacing: 0.02em; }
.footer__col a { display: block; font-size: 0.9rem; margin-bottom: 10px; transition: color 0.15s ease; }
.footer__col a:hover { color: var(--color-paper); }
.footer__bottom {
  border-top: 1px solid rgba(242, 244, 249, 0.12);
  padding: 22px 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}

/* =========================================================
   Responsive — tablet (≤ 960px)
   ========================================================= */
@media (max-width: 960px) {
  .hero__grid { grid-template-columns: 1fr; gap: 48px; }
  .hero__visual { order: -1; }
  .about__grid { grid-template-columns: 1fr; gap: 32px; }
  .services__grid { grid-template-columns: repeat(2, 1fr); }
  .testimonials__grid { grid-template-columns: repeat(2, 1fr); }
  .faq__grid { grid-template-columns: 1fr; gap: 28px; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
}

/* =========================================================
   Responsive — mobile (≤ 680px)
   ========================================================= */
@media (max-width: 680px) {
  :root { --nav-h: 64px; }

  .nav__links,
  .nav__actions .btn--ghost {
    display: none;
  }
  .nav__toggle { display: flex; }
  .nav.is-open .nav__links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-line);
    padding: 20px 24px 28px;
    gap: 18px;
  }
  .nav.is-open .nav__toggle span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav.is-open .nav__toggle span:nth-child(2) { opacity: 0; }
  .nav.is-open .nav__toggle span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

  .hero { padding: 56px 0 56px; }
  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .btn { justify-content: center; }

  .about, .services, .testimonials, .faq { padding: 56px 0; }
  .services__grid { grid-template-columns: 1fr; }
  .testimonials__grid { grid-template-columns: 1fr; }
  .stat-row { gap: 28px; }

  .cta { padding: 64px 0 72px; }
  .footer__grid { grid-template-columns: 1fr; gap: 32px; padding-bottom: 32px; }
}