/* ==========================================================================
   NEXX Growth Co. — Stylesheet
   Structure:
   1. Reset & base
   2. Design tokens
   3. Utilities
   4. Background field (ambient)
   5. Header / Nav
   6. Hero + signature graph card
   7. Manifesto
   8. Services
   9. Projects
   10. Tools
   11. Blog
   12. Newsletter
   13. Footer
   14. Reveal animation system
   15. Responsive
   ========================================================================== */

/* ---------- 1. Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

@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;
  }
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; }
input { font: inherit; }

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

/* ---------- 2. Design tokens ---------- */
:root {
  /* Color */
  --bg: #050505;
  --surface: #0D0D0D;
  --surface-2: #161616;
  --text: #FFFFFF;
  --text-secondary: #BDBDBD;
  --blue: #4F8CFF;
  --green: #4ADE80;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);

  /* Type */
  --font-display: 'Satoshi', 'Inter', sans-serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4.5rem;
  --space-7: 7rem;

  /* Layout */
  --container-w: 1200px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;

  /* Motion */
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---------- 3. Utilities ---------- */
.container {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link {
  position: absolute;
  left: var(--space-2);
  top: -60px;
  background: var(--blue);
  color: #fff;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: var(--space-2); }

:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 3px;
  border-radius: 4px;
}

.text-gradient {
  background: linear-gradient(90deg, var(--blue), var(--green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section-eyebrow {
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--blue);
  font-weight: 600;
  margin-bottom: var(--space-2);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-6);
  max-width: 30ch;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease), border-color 0.25s var(--ease);
  white-space: nowrap;
}
.btn svg { transition: transform 0.25s var(--ease); }
.btn:hover svg { transform: translateX(3px); }

.btn--primary {
  background: var(--green);
  color: #05130a;
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px -6px rgba(74, 222, 128, 0.45);
}

.btn--ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn--ghost:hover {
  border-color: var(--blue);
  background: rgba(79, 140, 255, 0.08);
  transform: translateY(-2px);
}

/* ---------- 4. Background field ---------- */
.bg-field {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, black 40%, transparent 100%);
}

.bg-glow {
  position: absolute;
  width: 620px;
  height: 620px;
  border-radius: 50%;
  filter: blur(140px);
  opacity: 0.18;
}
.bg-glow--blue { background: var(--blue); top: -220px; left: -120px; }
.bg-glow--green { background: var(--green); top: 30%; right: -220px; opacity: 0.12; }

/* ---------- 5. Header / Nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(5, 5, 5, 0.72);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--border);
}

.nav {
  max-width: var(--container-w);
  margin-inline: auto;
  padding: var(--space-2) var(--space-4);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav__logo {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  margin-right: auto;
}

.nav__logo-mark { display: inline-flex; }

.nav__menu {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: 0.92rem;
  color: var(--text-secondary);
}
.nav__menu a { transition: color 0.2s var(--ease); position: relative; }
.nav__menu a:hover { color: var(--text); }
.nav__menu a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 1px;
  background: var(--blue);
  transition: width 0.25s var(--ease);
}
.nav__menu a:hover::after { width: 100%; }

.nav__cta { flex-shrink: 0; }

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  padding: 8px;
}
.nav__toggle span {
  width: 20px; height: 1.5px;
  background: var(--text);
  border-radius: 2px;
}

/* ---------- 6. Hero ---------- */
.hero {
  padding: var(--space-7) 0 var(--space-6);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-6);
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  margin-bottom: var(--space-3);
}
.eyebrow__dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.18);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.6rem, 5.6vw, 4.4rem);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-3);
}
.hero__title-accent {
  background: linear-gradient(100deg, var(--blue) 10%, var(--green) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero__subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 42ch;
  margin-bottom: var(--space-4);
}

.hero__actions {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-bottom: var(--space-5);
}

.hero__stats {
  display: flex;
  gap: var(--space-5);
  border-top: 1px solid var(--border);
  padding-top: var(--space-3);
}
.hero__stat dt {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 0.25rem;
}
.hero__stat dd {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
}

/* Signature element: growth graph card */
.hero__visual { position: relative; }

.graph-card {
  background: linear-gradient(180deg, var(--surface), var(--surface-2));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  box-shadow: 0 30px 80px -30px rgba(0,0,0,0.6);
  position: relative;
  overflow: hidden;
}
.graph-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 80% 0%, rgba(79,140,255,0.12), transparent 55%);
  pointer-events: none;
}

.graph-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-2);
  font-size: 0.8rem;
}
.graph-card__label { color: var(--text-secondary); font-family: monospace; }
.graph-card__status {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--green);
  font-weight: 600;
}
.graph-card__status i {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(74,222,128,0.18);
}

.graph-card__svg { width: 100%; height: auto; display: block; }

.graph-card__footer {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  border-top: 1px solid var(--border);
  padding-top: var(--space-2);
  margin-top: var(--space-1);
}
.graph-card__metric span {
  display: block;
  font-size: 0.75rem;
  color: var(--text-secondary);
}
.graph-card__metric strong {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--green);
}

/* graph node/link styling, drawn via JS */
.gnode { fill: var(--surface-2); stroke: var(--border-strong); stroke-width: 1; }
.gnode--active { fill: var(--blue); }
.glink { stroke: rgba(255,255,255,0.14); stroke-width: 1; }
.glink--pulse { stroke: url(#linkGradient); stroke-width: 1.4; }

/* ---------- 7. Manifesto ---------- */
.manifesto {
  padding: var(--space-6) 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
}
.manifesto__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.6vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  max-width: 22ch;
  margin-inline: auto;
  margin-bottom: var(--space-4);
}

.pill-row {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.pill {
  padding: 0.55rem 1.2rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--text-secondary);
  transition: border-color 0.25s var(--ease), color 0.25s var(--ease);
}
.pill:hover { border-color: var(--blue); color: var(--text); }

/* ---------- 8. Services ---------- */
.services { padding: var(--space-7) 0; }

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.service-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}
.service-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  background: var(--surface-2);
}
.service-card__icon {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-3);
}
.service-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; font-weight: 600; }
.service-card p { color: var(--text-secondary); font-size: 0.95rem; }

/* ---------- 9. Projects ---------- */
.projects { padding: var(--space-7) 0; background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.projects__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: 200px;
  gap: var(--space-3);
}

.project-card {
  position: relative;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: linear-gradient(160deg, var(--surface-2), var(--bg));
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.project-card:hover { transform: translateY(-4px); border-color: var(--blue); }
.project-card--lg { grid-column: span 2; grid-row: span 1; }

.project-card__glow {
  position: absolute;
  width: 240px; height: 240px;
  border-radius: 50%;
  background: var(--blue);
  filter: blur(90px);
  opacity: 0.25;
  top: -80px; right: -60px;
}

.project-card__tag {
  align-self: flex-start;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--green);
  font-weight: 600;
  margin-bottom: auto;
}
.project-card h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.35rem; font-family: var(--font-display); }
.project-card p { color: var(--text-secondary); font-size: 0.9rem; max-width: 40ch; }

/* ---------- 10. Tools ---------- */
.tools { padding: var(--space-7) 0; }

.tools__grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}
.tool-chip {
  padding: 0.7rem 1.3rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: all 0.25s var(--ease);
}
.tool-chip:hover {
  color: var(--text);
  border-color: var(--green);
  background: rgba(74, 222, 128, 0.06);
  transform: translateY(-2px);
}

/* ---------- 11. Blog ---------- */
.blog { padding: var(--space-7) 0; background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.blog__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

.blog-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}
.blog-card:hover { transform: translateY(-4px); border-color: var(--border-strong); }

.blog-card__cover {
  height: 160px;
  background-size: cover;
  background-position: center;
}
.blog-card__cover--1 { background: linear-gradient(135deg, #12213f, #050505); }
.blog-card__cover--2 { background: linear-gradient(135deg, #0f2b1c, #050505); }
.blog-card__cover--3 { background: linear-gradient(135deg, #1a1533, #050505); }

.blog-card__body { padding: var(--space-3); }
.blog-card__meta { font-size: 0.78rem; color: var(--text-secondary); display: block; margin-bottom: 0.5rem; }
.blog-card__category { color: var(--blue); font-weight: 600; }
.blog-card h3 { font-size: 1.05rem; font-weight: 600; line-height: 1.4; }

/* ---------- 12. Newsletter ---------- */
.newsletter { padding: var(--space-7) 0; }

.newsletter__inner {
  text-align: center;
  max-width: 640px;
}
.newsletter__inner h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.2vw, 2.2rem);
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.newsletter__form {
  display: flex;
  gap: 0.6rem;
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 0.4rem;
  border-radius: 999px;
}
.newsletter__form input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--text);
  padding: 0.7rem 1rem;
}
.newsletter__form input::placeholder { color: var(--text-secondary); }
.newsletter__form input:focus { outline: none; }

.newsletter__note {
  margin-top: var(--space-2);
  font-size: 0.85rem;
  color: var(--green);
  min-height: 1.2em;
}

/* ---------- 13. Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding-top: var(--space-6);
  background: var(--surface);
}

.footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-4);
  padding-bottom: var(--space-5);
}

.footer__brand p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: var(--space-2);
  max-width: 32ch;
}

.footer__links, .footer__social {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}
.footer__links h4, .footer__social h4 {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-secondary);
  margin-bottom: 0.3rem;
  font-weight: 600;
}
.footer__links a, .footer__social a {
  color: var(--text-secondary);
  font-size: 0.92rem;
  transition: color 0.2s var(--ease);
  width: fit-content;
}
.footer__links a:hover, .footer__social a:hover { color: var(--text); }

.footer__bottom {
  border-top: 1px solid var(--border);
  padding-block: var(--space-3);
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* ---------- 14. Reveal animation system ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  [data-reveal] { opacity: 1; transform: none; transition: none; }
}

/* ---------- 15. Responsive ---------- */
@media (max-width: 1024px) {
  .services__grid { grid-template-columns: repeat(2, 1fr); }
  .projects__grid { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 190px; }
  .project-card--lg { grid-column: span 2; }
  .blog__grid { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .footer__brand { grid-column: span 2; }
}

@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__visual { order: -1; max-width: 460px; margin-inline: auto; width: 100%; }
}

@media (max-width: 760px) {
  .nav__menu {
    position: fixed;
    inset: 64px 16px auto 16px;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-3);
    transform: translateY(-12px);
    opacity: 0;
    pointer-events: none;
    transition: all 0.25s var(--ease);
  }
  .nav__menu.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .nav__toggle { display: flex; }
  .nav__cta { display: none; }

  .services__grid { grid-template-columns: 1fr; }
  .projects__grid { grid-template-columns: 1fr; grid-auto-rows: auto; }
  .project-card--lg { grid-column: span 1; }
  .project-card { min-height: 170px; }
  .blog__grid { grid-template-columns: 1fr; }
  .hero__stats { flex-wrap: wrap; gap: var(--space-3); }
  .footer__grid { grid-template-columns: 1fr; }
  .footer__brand { grid-column: span 1; }
  .newsletter__form { flex-direction: column; border-radius: var(--radius-md); }
  .newsletter__form input { text-align: center; }
}