@import url('https://fonts.googleapis.com/css2?family=Nunito+Sans:wght@300;400;600;700;800;900&display=swap');

:root {
  --bt-bg: #0f1923;
  --bt-surface: #152033;
  --bt-surface-2: #1e293b;
  --bt-border: rgba(255,255,255,0.06);
  --bt-border-2: #2d3f55;
  --bt-blue: #3b82f6;
  --bt-blue-dim: #2563eb;
  --bt-blue-light: #60a5fa;
  --bt-text: #f1f5f9;
  --bt-text-2: #cbd5e1;
  --bt-text-muted: #94a3b8;
  --bt-text-dim: #64748b;
}

*, *::before, *::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Nunito Sans', sans-serif;
  background: var(--bt-bg);
  color: var(--bt-text);
  margin: 0;
}

/* NAV */
.bt-nav {
  position: fixed;
  top: 0;
  width: 100%;
  z-index: 1000;
  height: 64px;
  display: flex;
  align-items: center;
  background: rgba(15,25,35,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--bt-border);
  padding: 0 2rem;
}

.bt-nav__brand {
  font-size: 1.05rem;
  font-weight: 300;
  letter-spacing: 0.04em;
  color: var(--bt-text);
  text-decoration: none;
  text-transform: uppercase;
}

.bt-nav__brand strong {
  font-weight: 900;
}

.bt-nav__links {
  list-style: none;
  display: flex;
  gap: 2rem;
  margin: 0;
  padding: 0;
  margin-left: auto;
}

.bt-nav__links li a {
  color: var(--bt-text-muted);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.bt-nav__links li a:hover {
  color: var(--bt-text);
}

.bt-nav__cta {
  background: var(--bt-blue);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.45rem 1.1rem;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-decoration: none;
  margin-left: 1.5rem;
  transition: background 0.15s;
}

.bt-nav__cta:hover {
  background: var(--bt-blue-dim);
}

.bt-nav__toggle {
  display: none;
  background: none;
  border: 1px solid var(--bt-border-2);
  color: var(--bt-text-muted);
  border-radius: 6px;
  padding: 0.35rem 0.6rem;
  cursor: pointer;
}

/* HERO */
.bt-hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 7rem 2rem 5rem;
  text-align: center;
  background: radial-gradient(ellipse 80% 60% at 50% -10%, rgba(59,130,246,0.12) 0%, transparent 70%), var(--bt-bg);
  position: relative;
  overflow: hidden;
}

.bt-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(0deg, transparent, transparent 59px, rgba(255,255,255,0.02) 60px),
    repeating-linear-gradient(90deg, transparent, transparent 59px, rgba(255,255,255,0.02) 60px);
  pointer-events: none;
}

.bt-hero__eyebrow {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--bt-blue-light);
  border: 1px solid rgba(96,165,250,0.25);
  border-radius: 100px;
  padding: 0.3rem 1rem;
  margin-bottom: 2rem;
  background: rgba(59,130,246,0.06);
}

.bt-hero__title {
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  font-weight: 900;
  line-height: 1.1;
  color: var(--bt-text);
  margin: 0 0 1.5rem;
  max-width: 820px;
}

.bt-hero__title em {
  font-style: normal;
  color: var(--bt-blue-light);
}

.bt-hero__sub {
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 300;
  color: var(--bt-text-muted);
  max-width: 560px;
  margin: 0 auto 2.5rem;
  line-height: 1.8;
}

.bt-hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.bt-btn {
  display: inline-block;
  border-radius: 8px;
  padding: 0.75rem 1.75rem;
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: all 0.15s;
  cursor: pointer;
  border: 2px solid transparent;
}

.bt-btn--blue {
  background: var(--bt-blue);
  color: #fff;
  border-color: var(--bt-blue);
}

.bt-btn--blue:hover {
  background: var(--bt-blue-dim);
  border-color: var(--bt-blue-dim);
  transform: translateY(-1px);
}

.bt-btn--outline {
  background: transparent;
  color: var(--bt-text-2);
  border-color: var(--bt-border-2);
}

.bt-btn--outline:hover {
  border-color: var(--bt-blue-light);
  color: var(--bt-blue-light);
}

.bt-hero__scroll {
  position: absolute;
  bottom: 2rem;
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--bt-text-dim);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.bt-hero__scroll::after {
  content: '';
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--bt-text-dim), transparent);
}

/* SECTIONS */
.bt-section {
  padding: 6rem 2rem;
}

.bt-section--alt {
  background: var(--bt-surface);
}

.bt-section--dark {
  background: #0a1219;
}

.bt-container {
  max-width: 1100px;
  margin: 0 auto;
  width: 100%;
}

.bt-eyebrow {
  display: block;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--bt-blue-light);
  margin-bottom: 1rem;
}

.bt-section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 900;
  line-height: 1.2;
  color: var(--bt-text);
  margin: 0 0 1rem;
}

.bt-section-title em {
  font-style: normal;
  color: var(--bt-blue-light);
}

.bt-section-sub {
  font-size: 1rem;
  font-weight: 300;
  color: var(--bt-text-muted);
  line-height: 1.8;
  max-width: 560px;
  margin-bottom: 3.5rem;
}

/* SERVICES GRID */
.bt-services {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.bt-service-card {
  background: var(--bt-surface-2);
  border: 1px solid var(--bt-border);
  border-radius: 16px;
  padding: 2rem 1.75rem;
  transition: transform 0.2s;
  border-top: 3px solid var(--bt-blue);
}

.bt-service-card:hover {
  transform: translateY(-3px);
}

.bt-service-card__icon {
  font-size: 1.75rem;
  color: var(--bt-blue-light);
  margin-bottom: 1.25rem;
}

.bt-service-card__title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--bt-text);
  margin: 0 0 0.75rem;
}

.bt-service-card__body {
  font-size: 0.88rem;
  color: var(--bt-text-muted);
  line-height: 1.75;
}

/* WORK / PORTFOLIO */
.bt-work-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.bt-work-card {
  background: var(--bt-surface-2);
  border: 1px solid var(--bt-border);
  border-radius: 16px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
}

.bt-work-card__tag {
  font-size: 0.68rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--bt-blue-light);
  background: rgba(59,130,246,0.08);
  border: 1px solid rgba(96,165,250,0.2);
  border-radius: 100px;
  padding: 0.2rem 0.7rem;
  align-self: flex-start;
  margin-bottom: 1rem;
}

.bt-work-card__title {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--bt-text);
  margin: 0 0 0.6rem;
}

.bt-work-card__body {
  font-size: 0.86rem;
  color: var(--bt-text-muted);
  line-height: 1.75;
  flex-grow: 1;
}

/* WHO WE SERVE */
.bt-clients {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  margin-top: 3rem;
}

.bt-client-tile {
  background: var(--bt-surface-2);
  border: 1px solid var(--bt-border);
  border-radius: 12px;
  padding: 1.5rem;
  text-align: center;
}

.bt-client-tile__icon {
  font-size: 1.5rem;
  color: var(--bt-blue);
  margin-bottom: 0.75rem;
}

.bt-client-tile__label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--bt-text-2);
}

.bt-client-tile__sub {
  font-size: 0.78rem;
  color: var(--bt-text-dim);
  margin-top: 0.25rem;
}

/* AI SECTION */
.bt-ai {
  background: linear-gradient(135deg, #1a2744 0%, #0f1923 60%, #0d1f3a 100%);
  border-top: 1px solid var(--bt-border);
  border-bottom: 1px solid var(--bt-border);
}

.bt-ai__inner {
  display: flex;
  align-items: center;
  gap: 4rem;
  flex-wrap: wrap;
}

.bt-ai__text {
  flex: 1 1 360px;
}

.bt-ai__visual {
  flex: 0 0 300px;
  background: rgba(59,130,246,0.05);
  border: 1px solid rgba(59,130,246,0.15);
  border-radius: 16px;
  padding: 2rem;
  font-family: monospace;
  font-size: 0.78rem;
  color: #60a5fa;
  line-height: 1.9;
}

.bt-ai__visual .dim {
  color: rgba(96,165,250,0.35);
}

/* PILLAR / PITCH */
.bt-pitch {
  text-align: center;
  padding: 5rem 2rem;
  background: radial-gradient(ellipse 70% 50% at 50% 50%, rgba(59,130,246,0.07) 0%, transparent 70%), var(--bt-surface);
}

.bt-pitch__quote {
  font-size: clamp(1.3rem, 3vw, 2rem);
  font-weight: 300;
  color: var(--bt-text-2);
  max-width: 760px;
  margin: 0 auto 0.5rem;
  line-height: 1.6;
  font-style: italic;
}

.bt-pitch__attr {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--bt-text-dim);
}

/* CONTACT */
.bt-contact__wrap {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: start;
}

.bt-contact__info {
  padding-top: 0.5rem;
}

.bt-contact__detail {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.bt-contact__detail-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(59,130,246,0.1);
  border: 1px solid rgba(59,130,246,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--bt-blue-light);
  font-size: 0.9rem;
}

.bt-contact__detail-label {
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--bt-text-dim);
  margin: 0 0 0.2rem;
}

.bt-contact__detail-value {
  font-size: 0.9rem;
  color: var(--bt-text-2);
  margin: 0;
}

/* FORM */
.bt-form__group {
  margin-bottom: 1.25rem;
}

.bt-form__label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--bt-text-dim);
  margin-bottom: 0.5rem;
}

.bt-form__control {
  width: 100%;
  background: var(--bt-surface-2);
  border: 1px solid var(--bt-border-2);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  color: var(--bt-text);
  font-family: 'Nunito Sans', sans-serif;
  font-size: 0.9rem;
  transition: border-color 0.15s, box-shadow 0.15s;
  outline: none;
}

.bt-form__control:focus {
  border-color: var(--bt-blue);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.18);
}

.bt-form__control::placeholder {
  color: var(--bt-text-dim);
}

.bt-form__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.bt-form__submit {
  width: 100%;
  margin-top: 0.5rem;
  font-family: 'Nunito Sans', sans-serif;
}

.bt-success {
  background: rgba(34,197,94,0.08);
  border: 1px solid rgba(34,197,94,0.25);
  border-radius: 8px;
  padding: 1rem 1.25rem;
  color: #86efac;
  font-size: 0.88rem;
  margin-bottom: 1rem;
  display: none;
}

.bt-success.show {
  display: block;
}

/* FOOTER */
.bt-footer {
  border-top: 1px solid var(--bt-border);
  padding: 2.5rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.bt-footer__copy {
  font-size: 0.78rem;
  color: var(--bt-text-dim);
}

.bt-footer__links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.bt-footer__links a {
  color: var(--bt-text-dim);
  text-decoration: none;
  font-size: 0.78rem;
}

.bt-footer__links a:hover {
  color: var(--bt-text-muted);
}

/* MOBILE */
@media (max-width: 768px) {
  .bt-nav__links {
    display: none;
  }

  .bt-nav__cta {
    display: none;
  }

  .bt-nav__links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    width: 100%;
    background: rgba(15,25,35,0.98);
    padding: 1.5rem 2rem;
    gap: 1.25rem;
    border-bottom: 1px solid var(--bt-border);
  }

  .bt-nav__cta.open {
    display: block;
    margin-left: 2rem;
    margin-bottom: 1.5rem;
  }

  .bt-nav__toggle {
    display: block;
  }

  .bt-contact__wrap {
    grid-template-columns: 1fr;
  }

  .bt-ai__inner {
    flex-direction: column;
  }

  .bt-ai__visual {
    flex: 0 0 auto;
    width: 100%;
  }

  .bt-form__row {
    grid-template-columns: 1fr;
  }

  .bt-footer {
    flex-direction: column;
    text-align: center;
  }
}