/* ============================================
   Tranquillo — Minimal, Apple-inspired design
   ============================================ */

:root {
  --color-bg: #fafafa;
  --color-bg-alt: #ffffff;
  --color-bg-dark: #0a0a0a;
  --color-text: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-text-tertiary: #86868b;
  --color-text-inverse: #f5f5f7;
  --color-accent: #0071e3;
  --color-accent-hover: #0077ED;
  --color-border: rgba(0, 0, 0, 0.08);
  --color-border-light: rgba(0, 0, 0, 0.04);
  --color-card: #ffffff;
  --color-card-hover: #f5f5f7;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 10rem;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-full: 980px;

  --transition: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
  --transition-slow: 0.6s cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-weight: var(--font-weight-regular);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

ul { list-style: none; }
img { max-width: 100%; display: block; }

/* Container */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

/* ============================================
   Navigation
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-sm) 0;
  transition: var(--transition);
  background: rgba(250, 250, 250, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
}

.nav--scrolled {
  border-bottom: 1px solid var(--color-border);
}

.nav__inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
}

.nav__logo {
  font-size: 1.25rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

.nav__links a {
  font-size: 0.875rem;
  font-weight: var(--font-weight-regular);
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

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

.nav__cta {
  color: var(--color-accent) !important;
  font-weight: var(--font-weight-medium) !important;
}

.nav__cta:hover {
  color: var(--color-accent-hover) !important;
}

/* Mobile toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--color-text);
  transition: var(--transition);
  transform-origin: center;
}

.nav__toggle.active span:first-child {
  transform: translateY(3.75px) rotate(45deg);
}

.nav__toggle.active span:last-child {
  transform: translateY(-3.75px) rotate(-45deg);
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: var(--font-weight-medium);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

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

.btn--primary:hover {
  background: var(--color-accent-hover);
  transform: scale(1.02);
}

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

.btn--ghost:hover {
  background: var(--color-card-hover);
  border-color: rgba(0, 0, 0, 0.12);
}

.btn--large {
  padding: 16px 32px;
  font-size: 1.0625rem;
}

/* ============================================
   Section Header
   ============================================ */
.section-header {
  margin-bottom: var(--space-xl);
}

.section-header__eyebrow {
  font-size: 0.8125rem;
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.section-header__title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--color-text);
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 80px;
  overflow: hidden;
}

.hero__content {
  max-width: 720px;
}

.hero__eyebrow {
  font-size: 0.8125rem;
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-md);
}

.hero__title {
  font-size: clamp(2.75rem, 7vw, 5rem);
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.04em;
  line-height: 1.05;
  color: var(--color-text);
  margin-bottom: var(--space-md);
}

.hero__subtitle {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  font-weight: var(--font-weight-light);
  color: var(--color-text-secondary);
  line-height: 1.6;
  max-width: 540px;
  margin-bottom: var(--space-xl);
}

.hero__actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.hero__gradient {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60%;
  height: 80%;
  background: radial-gradient(ellipse at center, rgba(0, 113, 227, 0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
}

/* ============================================
   Logo Strip
   ============================================ */
.logos {
  padding: var(--space-xl) 0;
  border-bottom: 1px solid var(--color-border-light);
}

.logos__label {
  font-size: 0.75rem;
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-tertiary);
  text-align: center;
  margin-bottom: var(--space-lg);
}

.logos__strip {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm) var(--space-lg);
}

.logos__item {
  width: 100px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-tertiary);
  opacity: 0.5;
  transition: opacity var(--transition);
}

.logos__item:hover {
  opacity: 0.85;
}

.logos__item svg {
  width: 100%;
  height: 100%;
}

/* ============================================
   About
   ============================================ */
.about {
  padding: var(--space-xl) 0 0;
}

.about__text {
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  font-weight: var(--font-weight-light);
  color: var(--color-text-secondary);
  line-height: 1.7;
  max-width: 680px;
  text-align: center;
  margin: 0 auto;
}

/* ============================================
   Services
   ============================================ */
.services {
  padding: var(--space-3xl) 0;
}

.services__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
}

.service-card {
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  background: var(--color-card);
  border: 1px solid var(--color-border-light);
  transition: var(--transition);
}

.service-card:hover {
  border-color: var(--color-border);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
}

.service-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  background: var(--color-bg);
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

.service-card__title {
  font-size: 1.125rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
}

.service-card__desc {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-sm);
}

.service-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  list-style: none;
}

.service-card__tags li {
  font-size: 0.6875rem;
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  background: var(--color-bg);
  color: var(--color-text-tertiary);
  border: 1px solid var(--color-border-light);
}

/* ============================================
   Approach
   ============================================ */
.approach {
  padding: var(--space-3xl) 0;
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
}

.approach .section-header__title {
  color: var(--color-text-inverse);
}

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

.approach__item {
  padding: var(--space-lg) 0;
}

.approach__number {
  display: block;
  font-size: 0.75rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-md);
}

.approach__item h3 {
  font-size: 1.375rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.approach__item p {
  font-size: 0.9375rem;
  color: rgba(245, 245, 247, 0.6);
  line-height: 1.6;
}

/* ============================================
   Experience
   ============================================ */
.experience {
  padding: var(--space-3xl) 0;
}

.experience__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
  margin-bottom: var(--space-xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.stat__number {
  display: block;
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.04em;
  color: var(--color-text);
  line-height: 1;
  margin-bottom: var(--space-xs);
}

.stat__label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

.experience__domains {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  font-size: 0.8125rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  transition: var(--transition);
}

.tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ============================================
   Engagements / Case Cards
   ============================================ */
.engagements {
  padding: var(--space-3xl) 0;
  background: var(--color-bg-alt);
}

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

.case-card {
  padding: var(--space-lg);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  border: 1px solid var(--color-border-light);
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.case-card:hover {
  border-color: var(--color-border);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.case-card--muted {
  opacity: 0.7;
}

.case-card--muted:hover {
  opacity: 1;
}

.case-card__sector {
  display: inline-block;
  font-size: 0.6875rem;
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.case-card__title {
  font-size: 1.125rem;
  font-weight: var(--font-weight-semibold);
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xs);
  color: var(--color-text);
  line-height: 1.3;
}

.case-card__desc {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  flex: 1;
  margin-bottom: var(--space-sm);
}

.case-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  list-style: none;
  margin-top: auto;
}

.case-card__tags li {
  font-size: 0.625rem;
  font-weight: var(--font-weight-medium);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 3px 8px;
  border-radius: var(--radius-full);
  background: var(--color-card);
  color: var(--color-text-tertiary);
  border: 1px solid var(--color-border-light);
}

/* ============================================
   Technologies
   ============================================ */
.technologies {
  padding: var(--space-3xl) 0;
  background: var(--color-bg-dark);
  color: var(--color-text-inverse);
}

.technologies .section-header__title {
  color: var(--color-text-inverse);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-lg);
}

.tech-group h4 {
  font-size: 0.8125rem;
  font-weight: var(--font-weight-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-xs);
}

.tech-group p {
  font-size: 0.9375rem;
  color: rgba(245, 245, 247, 0.6);
  line-height: 1.7;
}

/* ============================================
   Contact
   ============================================ */
.contact {
  padding: var(--space-3xl) 0;
}

.contact__inner {
  max-width: 600px;
}

.contact__desc {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-lg);
}

.contact__actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-md);
}

.contact__location {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

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

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-xl);
}

.footer__brand p {
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
  margin-top: var(--space-xs);
  line-height: 1.5;
}

.footer__links {
  display: flex;
  gap: var(--space-lg);
}

.footer__links a {
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  transition: color var(--transition);
}

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

.footer__bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border-light);
}

.footer__bottom p {
  font-size: 0.75rem;
  color: var(--color-text-tertiary);
}

/* ============================================
   Animations
   ============================================ */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.8s cubic-bezier(0.25, 0.1, 0.25, 1),
              transform 0.8s cubic-bezier(0.25, 0.1, 0.25, 1);
}

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

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
  .services__grid {
    gap: var(--space-sm);
  }

  .approach__grid {
    gap: var(--space-md);
  }

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

  .tech-grid {
    gap: var(--space-md);
  }
}

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

  .nav__links {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(250, 250, 250, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
  }

  .nav__links.open {
    opacity: 1;
    visibility: visible;
  }

  .nav__links a {
    font-size: 1.25rem;
  }

  /* Hero */
  .hero {
    min-height: auto;
    padding-top: 140px;
    padding-bottom: var(--space-3xl);
  }

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

  /* Approach */
  .approach__grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
  }

  .approach__item {
    padding: var(--space-md) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  }

  .approach__item:last-child {
    border-bottom: none;
  }

  /* Experience */
  .experience__stats {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  /* Case cards */
  .case-grid {
    grid-template-columns: 1fr;
  }

  /* Technologies */
  .tech-grid {
    grid-template-columns: 1fr;
  }

  /* Footer */
  .footer__inner {
    flex-direction: column;
    gap: var(--space-lg);
  }

  .footer__links {
    flex-direction: column;
    gap: var(--space-sm);
  }
}

@media (max-width: 480px) {
  .hero__actions {
    flex-direction: column;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .contact__actions {
    flex-direction: column;
  }

  .contact__actions .btn {
    width: 100%;
    text-align: center;
  }
}