/* ============================================================
   NEXUS STUDIO — style.css
   Mobile-first · Custom properties · No framework
   ============================================================ */

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

:root {
  /* Palette */
  --color-bg:            #F8FAFC;
  --color-surface:       #FFFFFF;
  --color-surface-alt:   #F1F5F9;
  --color-border:        #E2E8F0;
  --color-text:          #0F172A;
  --color-text-muted:    #64748B;
  --color-accent:        #2563EB;
  --color-accent-dark:   #1D4ED8;
  --color-accent-soft:   #DBEAFE;
  --color-accent-hover:  #EFF6FF;
  --color-success:       #10B981;
  --color-error:         #EF4444;

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius:    0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm:  0 1px 3px rgba(15,23,42,.08), 0 1px 2px rgba(15,23,42,.06);
  --shadow:     0 4px 16px rgba(15,23,42,.08);
  --shadow-lg:  0 8px 32px rgba(15,23,42,.12);
  --shadow-xl:  0 20px 60px rgba(15,23,42,.15);

  /* Motion */
  --ease: cubic-bezier(.4,0,.2,1);
  --duration: 250ms;

  /* Layout */
  --navbar-h: 70px;
  --container-max: 1200px;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--navbar-h);
  -webkit-text-size-adjust: 100%;
}

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

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, textarea, select { font-family: inherit; font-size: inherit; }

/* ── Utilities ────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.section          { padding-block: var(--space-20); }
.section--alt     { background: var(--color-surface-alt); }

.section-eyebrow  {
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}
.section-title    {
  font-size: clamp(var(--text-2xl), 4vw, var(--text-4xl));
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--color-text);
  margin-bottom: var(--space-4);
}
.section-desc     {
  max-width: 56ch;
  color: var(--color-text-muted);
  font-size: var(--text-lg);
}
.section-header   {
  text-align: center;
  margin-bottom: var(--space-12);
}
.section-header .section-desc { margin-inline: auto; }

.text-accent { color: var(--color-accent); }

/* Badge */
.badge {
  display: inline-block;
  padding: var(--space-1) var(--space-4);
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--space-5);
}

/* ── Buttons ──────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: .625rem var(--space-5);
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  transition: background var(--duration) var(--ease),
              color     var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease),
              transform  150ms var(--ease);
  white-space: nowrap;
}
.btn:active { transform: scale(.97); }

.btn--primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 0 0 0 rgba(37,99,235,0);
}
.btn--primary:hover, .btn--primary:focus-visible {
  background: var(--color-accent-dark);
  box-shadow: 0 4px 20px rgba(37,99,235,.35);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}
.btn--ghost:hover, .btn--ghost:focus-visible {
  background: var(--color-surface);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.btn--lg  { padding: .875rem var(--space-8); font-size: var(--text-base); border-radius: var(--radius-lg); }
.btn--full { width: 100%; }

/* Spinner inside button */
.btn-spinner {
  display: none;
  width: 18px; height: 18px;
  border: 2.5px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
}
.btn--loading .btn-text   { display: none; }
.btn--loading .btn-spinner { display: inline-block; }
.btn--loading { pointer-events: none; opacity: .8; }

@keyframes spin { to { transform: rotate(360deg); } }

/* ── Scroll Reveal System ─────────────────────────────────── */
/*
  Usage: data-animate="fade-up|fade-down|fade-left|fade-right|scale-up|fade-in"
         data-delay="0|100|200|…"  (ms)
  JS adds .is-visible when the element enters the viewport.
*/
[data-animate] {
  opacity: 0;
  transition: opacity .65s var(--ease), transform .65s var(--ease);
  will-change: opacity, transform;
}
[data-animate="fade-up"]    { transform: translateY(36px); }
[data-animate="fade-down"]  { transform: translateY(-36px); }
[data-animate="fade-left"]  { transform: translateX(-44px); }
[data-animate="fade-right"] { transform: translateX(44px); }
[data-animate="scale-up"]   { transform: scale(.9); }
[data-animate="fade-in"]    { /* opacity only */ }

[data-animate].is-visible {
  opacity: 1;
  transform: none;
}

/* Reduced motion: skip transform, keep a fast fade */
@media (prefers-reduced-motion: reduce) {
  [data-animate]            { transform: none !important; transition-duration: .01ms !important; }
  [data-animate].is-visible { opacity: 1; }
}

/* ── Navbar ───────────────────────────────────────────────── */
.navbar {
  position: fixed;
  inset-block-start: 0;
  inset-inline: 0;
  height: var(--navbar-h);
  z-index: 100;
  background: rgba(248,250,252,.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration) var(--ease),
              box-shadow   var(--duration) var(--ease);
}
.navbar.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.navbar__inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--space-6);
}

.navbar__logo {
  font-size: var(--text-xl);
  font-weight: 800;
  letter-spacing: -.03em;
  flex-shrink: 0;
}
.logo-mark   { color: var(--color-accent); }
.logo-accent { color: var(--color-accent); }

.navbar__nav   { margin-inline-start: auto; }
.navbar__list  { display: flex; gap: var(--space-1); }
.navbar__link  {
  display: block;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  transition: color var(--duration) var(--ease),
              background var(--duration) var(--ease);
}
.navbar__link:hover,
.navbar__link:focus-visible,
.navbar__link.active {
  color: var(--color-accent);
  background: var(--color-accent-hover);
}

.navbar__cta    { margin-inline-start: var(--space-4); }
.navbar__burger { display: none; flex-direction: column; gap: 5px; padding: var(--space-2); }
.navbar__burger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: transform var(--duration) var(--ease), opacity var(--duration) var(--ease);
  transform-origin: center;
}
.navbar__burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.navbar__burger.open span:nth-child(2) { opacity: 0; }
.navbar__burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Hero ─────────────────────────────────────────────────── */
.hero {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-block: calc(var(--navbar-h) + var(--space-16)) var(--space-20);
  background:
    radial-gradient(ellipse 80% 60% at 60% 10%, rgba(37,99,235,.08) 0%, transparent 70%),
    var(--color-bg);
  position: relative;
  overflow: hidden;
}

.hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: center;
}

.hero__title {
  font-size: clamp(var(--text-3xl), 6vw, var(--text-5xl));
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -.03em;
  margin-bottom: var(--space-5);
}
.hero__subtitle {
  font-size: clamp(var(--text-base), 2vw, var(--text-lg));
  color: var(--color-text-muted);
  max-width: 52ch;
  margin-bottom: var(--space-8);
  line-height: 1.7;
}
.hero__actions { display: flex; flex-wrap: wrap; gap: var(--space-4); }

/* Floating visual cards */
.hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 280px;
}
.hero__blob {
  position: absolute;
  width: 340px; height: 340px;
  background: radial-gradient(circle, rgba(37,99,235,.12) 0%, transparent 70%);
  border-radius: 50%;
  filter: blur(30px);
}
.hero__card {
  position: absolute;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  box-shadow: var(--shadow-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  min-width: 160px;
}
.hero__card span  { font-size: var(--text-xs); color: var(--color-text-muted); font-weight: 500; }
.hero__card strong { font-size: var(--text-2xl); font-weight: 800; color: var(--color-text); }
.hero__card--1  { top: 10%;  left: 5%;  animation: float 6s ease-in-out infinite; }
.hero__card--2  { bottom: 10%; right: 5%; animation: float 6s ease-in-out infinite 1s; }

.card-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  margin-bottom: var(--space-1);
}
.card-dot--green { background: var(--color-success); box-shadow: 0 0 0 3px rgba(16,185,129,.2); }
.card-dot--blue  { background: var(--color-accent);  box-shadow: 0 0 0 3px rgba(37,99,235,.2); }

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-12px); }
}

/* Scroll hint */
.hero__scroll-hint {
  display: flex;
  justify-content: center;
  padding-top: var(--space-8);
}
.scroll-line {
  display: block;
  width: 2px; height: 48px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  border-radius: var(--radius-full);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: 1; transform: scaleY(1); }
  50%       { opacity: .4; transform: scaleY(.6); }
}

/* ── About ────────────────────────────────────────────────── */
.about__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: center;
}

.about__image-wrap {
  position: relative;
  max-width: 440px;
  margin-inline: auto;
  width: 100%;
}
.about__image-placeholder {
  background: var(--color-accent-soft);
  border-radius: var(--radius-xl);
  aspect-ratio: 4/3;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.about__image-placeholder svg { width: 60%; height: auto; }

.about__badge-float {
  position: absolute;
  bottom: -var(--space-4);
  right: -var(--space-4);
  background: var(--color-accent);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-5);
  display: flex;
  flex-direction: column;
  align-items: center;
  box-shadow: var(--shadow-lg);
}
.about__badge-float strong { font-size: var(--text-xl); font-weight: 800; line-height: 1; }
.about__badge-float span   { font-size: var(--text-xs); opacity: .85; }

.about__text { color: var(--color-text-muted); margin-bottom: var(--space-6); line-height: 1.8; }

.about__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}
.about__list li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-weight: 500;
}
.check-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px; height: 24px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border-radius: 50%;
  font-size: var(--text-sm);
  font-weight: 700;
  flex-shrink: 0;
}

.about__stats {
  display: flex;
  gap: var(--space-8);
  flex-wrap: wrap;
}
.stat {
  display: flex;
  flex-direction: column;
}
.stat strong {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-accent);
  line-height: 1;
}
.stat span {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* ── Services ─────────────────────────────────────────────── */
.services__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

.service-card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  border: 1.5px solid var(--color-border);
  position: relative;
  transition: transform var(--duration) var(--ease),
              box-shadow var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
}
.service-card:hover {
  box-shadow: var(--shadow-xl);
  border-color: var(--color-accent);
}
/* Once revealed, restore the hover lift (overrides transform:none from reveal) */
.service-card.is-visible:hover {
  transform: translateY(-4px);
}

.service-card--featured {
  background: var(--color-text);
  border-color: var(--color-text);
  color: #fff;
}
.service-card--featured .service-card__text { color: #94A3B8; }
.service-card--featured .service-card__link { color: var(--color-accent-soft); }
.service-card--featured .service-card__icon { color: var(--color-accent-soft); background: rgba(255,255,255,.08); }
.service-card--featured:hover { border-color: var(--color-accent); }

.service-card__icon {
  width: 52px; height: 52px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
}
.service-card__icon svg { width: 26px; height: 26px; }

.service-card__badge {
  position: absolute;
  top: var(--space-5);
  right: var(--space-5);
  background: var(--color-accent);
  color: #fff;
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 2px var(--space-3);
  border-radius: var(--radius-full);
  letter-spacing: .04em;
  text-transform: uppercase;
}

.service-card__title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
}
.service-card__text {
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-5);
}
.service-card__link {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-accent);
  transition: gap var(--duration) var(--ease);
}
.service-card__link:hover { text-decoration: underline; }

/* ── Contact ──────────────────────────────────────────────── */
.contact__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: start;
}

.contact__text {
  color: var(--color-text-muted);
  margin-bottom: var(--space-8);
  line-height: 1.8;
}

.contact__details {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}
.contact__details li {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.contact__details a { color: var(--color-text); font-weight: 500; transition: color var(--duration); }
.contact__details a:hover { color: var(--color-accent); }

.contact__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  border-radius: var(--radius);
  font-size: var(--text-base);
  flex-shrink: 0;
}

/* Form */
.contact-form {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow);
  border: 1.5px solid var(--color-border);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}
.form-group label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}
.form-group label span { color: var(--color-accent); margin-inline-start: 2px; }

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: .75rem var(--space-4);
  background: var(--color-bg);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius);
  color: var(--color-text);
  transition: border-color var(--duration) var(--ease),
              box-shadow   var(--duration) var(--ease);
  outline: none;
  -webkit-appearance: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: #94A3B8; }
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(37,99,235,.12);
}
.form-group input.error,
.form-group textarea.error {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(239,68,68,.1);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group select   { background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748B' d='M6 8L1 3h10z'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right .75rem center; padding-right: 2.5rem; }

.form-error {
  font-size: var(--text-xs);
  color: var(--color-error);
  font-weight: 500;
  min-height: 1em;
}

.form-success {
  margin-top: var(--space-4);
  padding: var(--space-4);
  background: rgba(16,185,129,.1);
  border: 1px solid rgba(16,185,129,.3);
  border-radius: var(--radius);
  color: #065F46;
  font-size: var(--text-sm);
  font-weight: 500;
  text-align: center;
  display: none;
}
.form-success.visible { display: block; }

/* ── Footer ───────────────────────────────────────────────── */
.footer {
  background: var(--color-text);
  color: #CBD5E1;
}

.footer__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  padding-block: var(--space-16);
}

.footer__brand p { font-size: var(--text-sm); margin-top: var(--space-3); max-width: 30ch; line-height: 1.7; }
.footer__brand .navbar__logo { color: #F8FAFC; }
.footer__brand .logo-mark, .footer__brand .logo-accent { color: var(--color-accent-soft); }

.footer__heading {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: .1em;
  color: #94A3B8;
  font-weight: 600;
  margin-bottom: var(--space-4);
}
.footer__nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.footer__nav a {
  font-size: var(--text-sm);
  transition: color var(--duration);
}
.footer__nav a:hover { color: #F8FAFC; }

.socials-list {
  display: flex;
  gap: var(--space-3);
}
.socials-list a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  background: rgba(255,255,255,.07);
  border-radius: var(--radius);
  font-size: var(--text-sm);
  font-weight: 700;
  transition: background var(--duration);
}
.socials-list a:hover { background: var(--color-accent); color: #fff; }

.footer__bottom {
  border-top: 1px solid rgba(255,255,255,.08);
  padding-block: var(--space-6);
}
.footer__bottom .container {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: center;
  text-align: center;
  font-size: var(--text-sm);
  color: #64748B;
}
.footer__bottom a { transition: color var(--duration); }
.footer__bottom a:hover { color: #F8FAFC; }

/* ── Focus visible (accessibility) ───────────────────────── */
:focus-visible {
  outline: 2.5px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* ── Reduced motion ───────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   RESPONSIVE — Tablet (≥ 640px)
   ============================================================ */
@media (min-width: 640px) {
  .form-row { grid-template-columns: 1fr 1fr; }

  .services__grid { grid-template-columns: repeat(2, 1fr); }

  .footer__inner { grid-template-columns: repeat(2, 1fr); }
  .footer__bottom .container { flex-direction: row; justify-content: space-between; text-align: left; }
}

/* ============================================================
   RESPONSIVE — Desktop (≥ 1024px)
   ============================================================ */
@media (min-width: 1024px) {
  .container { padding-inline: var(--space-8); }

  /* Navbar */
  .navbar__burger { display: none !important; }
  .navbar__nav    { display: block !important; }

  /* Hero */
  .hero__inner {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
  }

  /* About */
  .about__inner {
    grid-template-columns: 1fr 1fr;
  }

  /* Services */
  .services__grid { grid-template-columns: repeat(3, 1fr); }

  /* Contact */
  .contact__inner { grid-template-columns: 1fr 1.4fr; }

  /* Footer */
  .footer__inner { grid-template-columns: 2fr 1fr 1fr; }
}

/* ============================================================
   MOBILE MENU OVERLAY (< 1024px)
   ============================================================ */
@media (max-width: 1023px) {
  .navbar__cta   { display: none; }
  .navbar__burger { display: flex; margin-inline-start: auto; }

  .navbar__nav {
    display: none;
    position: fixed;
    inset: var(--navbar-h) 0 0 0;
    background: var(--color-surface);
    padding: var(--space-8) var(--space-6);
    border-top: 1px solid var(--color-border);
    z-index: 99;
  }
  .navbar__nav.open { display: block; }
  .navbar__list { flex-direction: column; gap: var(--space-2); }
  .navbar__link {
    font-size: var(--text-lg);
    padding: var(--space-4);
  }
}