/* ===========================
   CSS Custom Properties
   =========================== */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #0f0f18;
  --bg-card: #13131f;
  --bg-card-hover: #1a1a2e;
  --bg-nav: rgba(10, 10, 15, 0.85);

  --text-primary: #e8e8f0;
  --text-secondary: #8888a0;
  --text-muted: #5a5a72;

  --accent: #00d4ff;
  --accent-dim: rgba(0, 212, 255, 0.12);
  --accent-glow: rgba(0, 212, 255, 0.25);

  --role-lead: #00d4ff;
  --role-mlops: #a855f7;
  --role-ml: #22c55e;
  --role-de: #f59e0b;

  --cat-ml: #22c55e;
  --cat-mlops: #a855f7;
  --cat-de: #f59e0b;

  --border: rgba(255, 255, 255, 0.06);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-pill: 100px;

  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --container: 1200px;
  --nav-height: 72px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: opacity 0.2s;
}

a:hover {
  opacity: 0.85;
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  display: block;
}

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

/* ===========================
   Section Headings
   =========================== */
.section__label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 12px;
}

.section__title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
}

.section__subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin-bottom: 40px;
}

/* ===========================
   Navigation
   =========================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: transparent;
  transition: background 0.3s, box-shadow 0.3s, backdrop-filter 0.3s;
}

.nav--scrolled {
  background: var(--bg-nav);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--border);
}

.nav__container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__logo:hover {
  opacity: 1;
}

.nav__logo-icon {
  color: var(--accent);
  font-size: 1.4rem;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.nav__links a:hover {
  color: var(--text-primary);
  opacity: 1;
}

.nav__cta {
  background: var(--accent-dim);
  color: var(--accent) !important;
  padding: 8px 20px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(0, 212, 255, 0.2);
  transition: background 0.2s, border-color 0.2s !important;
}

.nav__cta:hover {
  background: rgba(0, 212, 255, 0.2) !important;
  border-color: rgba(0, 212, 255, 0.4);
}

.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__toggle span {
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.nav__toggle--active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle--active span:nth-child(2) {
  opacity: 0;
}

.nav__toggle--active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ===========================
   Hero
   =========================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-height) + 40px) 0 80px;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(0, 212, 255, 0.08) 0%, transparent 70%),
    radial-gradient(ellipse 40% 40% at 80% 20%, rgba(168, 85, 247, 0.06) 0%, transparent 60%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
}

.hero__label {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}

.hero__title {
  font-size: clamp(2.4rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.08;
  margin-bottom: 24px;
  background: linear-gradient(135deg, var(--text-primary) 0%, rgba(200, 200, 220, 0.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.7;
  margin-bottom: 40px;
}

.hero__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-pill);
  transition: all 0.25s;
  cursor: pointer;
  border: none;
}

.btn--primary {
  background: var(--accent);
  color: var(--bg-primary);
}

.btn--primary:hover {
  opacity: 1;
  box-shadow: 0 0 32px var(--accent-glow);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
}

.btn--ghost:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.15);
  opacity: 1;
}

/* Hero Stats */
.hero__stats {
  display: flex;
  gap: 48px;
}

.hero__stat {
  display: flex;
  flex-direction: column;
}

.hero__stat-number {
  font-size: 2rem;
  font-weight: 800;
  color: var(--text-primary);
}

.hero__stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===========================
   Services
   =========================== */
.services {
  padding: 100px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
}

.service-card:hover {
  border-color: rgba(0, 212, 255, 0.15);
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.3);
}

.service-card__icon {
  width: 48px;
  height: 48px;
  color: var(--accent);
  margin-bottom: 20px;
}

.service-card__title {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-card__desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 20px;
}

.service-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.service-card__tags li {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 4px 10px;
  background: var(--accent-dim);
  color: var(--accent);
  border-radius: var(--radius-pill);
  font-weight: 500;
}

/* ===========================
   Use Cases / Projects
   =========================== */
.use-cases {
  padding: 100px 0;
}

/* Filter */
.filter {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}

.filter__btn {
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 8px 20px;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.filter__btn:hover {
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.15);
}

.filter__btn--active {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: rgba(0, 212, 255, 0.25);
}

.filter__count {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  background: rgba(255, 255, 255, 0.06);
  padding: 2px 7px;
  border-radius: var(--radius-pill);
}

.filter__btn--active .filter__count {
  background: rgba(0, 212, 255, 0.15);
}

/* Project Grid */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.project-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
  display: flex;
  flex-direction: column;
}

.project-card:hover {
  border-color: rgba(0, 212, 255, 0.12);
  transform: translateY(-3px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25);
}

.project-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  gap: 8px;
}

.project-card__category {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.project-card__category--ml {
  background: rgba(34, 197, 94, 0.12);
  color: var(--cat-ml);
}

.project-card__category--mlops {
  background: rgba(168, 85, 247, 0.12);
  color: var(--cat-mlops);
}

.project-card__category--de {
  background: rgba(245, 158, 11, 0.12);
  color: var(--cat-de);
}

.project-card__role {
  font-size: 0.72rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

.project-card__role--lead {
  background: rgba(0, 212, 255, 0.1);
  color: var(--role-lead);
}

.project-card__role--mlops {
  background: rgba(168, 85, 247, 0.1);
  color: var(--role-mlops);
}

.project-card__role--ml {
  background: rgba(34, 197, 94, 0.1);
  color: var(--role-ml);
}

.project-card__role--de {
  background: rgba(245, 158, 11, 0.1);
  color: var(--role-de);
}

.project-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 6px;
}

.project-card__client {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  font-weight: 500;
}

.project-card__desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 16px;
  flex-grow: 1;
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.project-card__tags span {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 3px 8px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-muted);
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.06);
  font-weight: 500;
}

/* ===========================
   Clients
   =========================== */
.clients {
  padding: 100px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  text-align: center;
}

.clients__grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-top: 48px;
}

.client-badge {
  font-size: 0.95rem;
  font-weight: 600;
  padding: 14px 28px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-secondary);
  transition: border-color 0.3s, color 0.3s;
}

.client-badge:hover {
  border-color: rgba(0, 212, 255, 0.15);
  color: var(--text-primary);
}

/* ===========================
   Contact
   =========================== */
.contact {
  padding: 100px 0;
  text-align: center;
}

.contact .section__subtitle {
  margin-left: auto;
  margin-right: auto;
}

.contact__links {
  display: flex;
  justify-content: center;
  gap: 24px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.contact__card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 36px 48px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  transition: border-color 0.3s, transform 0.3s;
  min-width: 240px;
}

.contact__card:hover {
  border-color: rgba(0, 212, 255, 0.2);
  transform: translateY(-3px);
  opacity: 1;
}

.contact__icon {
  width: 32px;
  height: 32px;
  color: var(--accent);
}

.contact__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
}

.contact__value {
  font-size: 0.92rem;
  color: var(--text-secondary);
}

/* ===========================
   Footer
   =========================== */
.footer {
  padding: 40px 0;
  border-top: 1px solid var(--border);
}

.footer__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer__brand {
  font-size: 1.1rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 8px;
}

.footer__copy {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.footer__links {
  display: flex;
  gap: 24px;
}

.footer__links a {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.footer__links a:hover {
  color: var(--text-primary);
  opacity: 1;
}

/* ===========================
   Animations
   =========================== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-in--visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===========================
   Responsive
   =========================== */
@media (max-width: 1024px) {
  .services__grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    padding: 16px 24px;
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.3s, opacity 0.3s;
  }

  .nav__links--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__links li {
    padding: 12px 0;
  }

  .nav__cta {
    margin-top: 8px;
    text-align: center;
    display: block;
  }

  .services__grid {
    grid-template-columns: 1fr;
  }

  .projects__grid {
    grid-template-columns: 1fr;
  }

  .hero__stats {
    flex-direction: column;
    gap: 24px;
  }

  .hero__title {
    font-size: clamp(2rem, 8vw, 3rem);
  }

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

  .contact__card {
    min-width: auto;
    flex: 1;
    padding: 28px 24px;
  }
}

@media (max-width: 480px) {
  .filter {
    gap: 6px;
  }

  .filter__btn {
    font-size: 0.8rem;
    padding: 6px 14px;
  }

  .hero__actions {
    flex-direction: column;
  }

  .btn {
    text-align: center;
    justify-content: center;
  }
}