/* ==========================================================================
   LUPITEX — Global Consulting | Master Stylesheet
   Architecture: Custom Properties → Reset → Base → Layout → Components → Utilities
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CUSTOM PROPERTIES (Design Tokens)
   -------------------------------------------------------------------------- */

:root {
  /* Palette */
  --color-black:        #050505;
  --color-black-soft:   #0a0a0a;
  --color-surface:      #111111;
  --color-white:        #ffffff;
  --color-gray-100:     #f3f4f6;
  --color-gray-300:     #d1d5db;
  --color-gray-400:     #9ca3af;
  --color-gray-500:     #6b7280;
  --color-border:       rgba(255, 255, 255, 0.10);
  --color-border-hover: rgba(255, 255, 255, 0.30);

  /* Typography */
  --font-family:       'Inter', system-ui, -apple-system, sans-serif;
  --font-weight-light: 300;
  --font-weight-normal:400;
  --font-weight-medium:500;
  --font-weight-semi:  600;
  --font-weight-bold:  700;

  --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;
  --text-7xl:  4.5rem;

  /* Spacing scale (8px base) */
  --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;
  --space-32: 8rem;
  --space-40: 10rem;

  /* Layout */
  --container-max:    80rem;
  --container-px:     1.5rem;
  --container-px-lg:  3rem;
  --nav-height:       6rem;

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-base:   300ms ease;
  --transition-slow:   500ms ease;
  --transition-reveal: 700ms cubic-bezier(0.25, 0.46, 0.45, 0.94);

  /* Z-index scale */
  --z-nav:     100;
  --z-overlay: 200;
  --z-modal:   300;
}


/* --------------------------------------------------------------------------
   2. RESET & BASE
   -------------------------------------------------------------------------- */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-normal);
  background-color: var(--color-black);
  color: var(--color-gray-100);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

::selection {
  background-color: var(--color-gray-500);
  color: var(--color-white);
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

input,
textarea {
  font-family: inherit;
  font-size: inherit;
  outline: none;
}


/* --------------------------------------------------------------------------
   3. LAYOUT
   -------------------------------------------------------------------------- */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--container-px);
  padding-right: var(--container-px);
}

@media (min-width: 1024px) {
  .container {
    padding-left: var(--container-px-lg);
    padding-right: var(--container-px-lg);
  }
}


/* --------------------------------------------------------------------------
   4. NAVIGATION
   -------------------------------------------------------------------------- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--z-nav);
  border-bottom: 1px solid var(--color-border);
  transition: background-color var(--transition-base),
              backdrop-filter var(--transition-base);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background-color: rgba(5, 5, 5, 0.5);
}

.nav--scrolled {
  background-color: rgba(5, 5, 5, 0.92);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

.nav__logo {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-white);
}

.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

@media (min-width: 768px) {
  .nav__links {
    display: flex;
  }
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gray-300);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-white);
  transition: width var(--transition-base);
}

.nav__link:hover {
  color: var(--color-white);
}

.nav__link:hover::after {
  width: 100%;
}

.nav__cta {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-white);
  padding: var(--space-2) var(--space-5);
  border: 1px solid var(--color-border-hover);
  transition: background-color var(--transition-base),
              color var(--transition-base);
}

.nav__cta:hover {
  background-color: var(--color-white);
  color: var(--color-black);
}

/* Mobile toggle */
.nav__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  cursor: pointer;
}

@media (min-width: 768px) {
  .nav__toggle {
    display: none;
  }
}

.nav__toggle-bar {
  display: block;
  width: 100%;
  height: 1.5px;
  background-color: var(--color-white);
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.nav__toggle--open .nav__toggle-bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav__toggle--open .nav__toggle-bar:nth-child(2) {
  opacity: 0;
}

.nav__toggle--open .nav__toggle-bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile menu */
.nav__mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  width: 100%;
  height: calc(100vh - var(--nav-height));
  background-color: rgba(5, 5, 5, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: var(--z-overlay);
  padding: var(--space-12) var(--container-px);
}

.nav__mobile-menu--open {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.nav__mobile-link {
  font-size: var(--text-3xl);
  font-weight: var(--font-weight-light);
  color: var(--color-white);
  letter-spacing: -0.01em;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.5s ease forwards;
}

.nav__mobile-link:nth-child(1) { animation-delay: 50ms; }
.nav__mobile-link:nth-child(2) { animation-delay: 100ms; }
.nav__mobile-link:nth-child(3) { animation-delay: 150ms; }
.nav__mobile-link:nth-child(4) { animation-delay: 200ms; }


/* --------------------------------------------------------------------------
   5. HERO
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero__bg-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero__bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to right,
    rgba(5, 5, 5, 0.95) 15%,
    rgba(5, 5, 5, 0.7) 50%,
    rgba(5, 5, 5, 0.3) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 48rem;
  padding-top: var(--nav-height);
}

.hero__eyebrow {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semi);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-gray-400);
  margin-bottom: var(--space-6);
}

.hero__title {
  font-size: clamp(2.5rem, 6vw, var(--text-7xl));
  font-weight: var(--font-weight-light);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--color-white);
  margin-bottom: var(--space-8);
}

.hero__title strong {
  font-weight: var(--font-weight-semi);
}

.hero__description {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-light);
  line-height: 1.7;
  color: var(--color-gray-400);
  max-width: 38rem;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-12);
  padding: var(--space-3) var(--space-6);
  border: 1px solid var(--color-border-hover);
  font-size: var(--text-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-white);
  transition: background-color var(--transition-base),
              color var(--transition-base);
}

.hero__cta:hover {
  background-color: var(--color-white);
  color: var(--color-black);
}

.hero__cta-icon {
  width: 1rem;
  height: 1rem;
  transition: transform var(--transition-base);
}

.hero__cta:hover .hero__cta-icon {
  transform: translateX(4px);
}


/* --------------------------------------------------------------------------
   6. APPROACH
   -------------------------------------------------------------------------- */

.approach {
  padding: var(--space-32) 0;
  background-color: var(--color-black-soft);
}

.approach__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-16);
  align-items: center;
}

@media (min-width: 1024px) {
  .approach__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-20);
  }
}

.approach__title {
  font-size: clamp(1.875rem, 4vw, var(--text-5xl));
  font-weight: var(--font-weight-light);
  letter-spacing: -0.02em;
  color: var(--color-white);
  margin-bottom: var(--space-8);
}

.approach__title em {
  font-weight: var(--font-weight-semi);
  font-style: italic;
}

.approach__text {
  font-size: var(--text-lg);
  font-weight: var(--font-weight-light);
  line-height: 1.8;
  color: var(--color-gray-400);
  margin-bottom: var(--space-6);
}

.approach__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semi);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-white);
  margin-top: var(--space-10);
}

.approach__link-line {
  display: block;
  width: 3rem;
  height: 1px;
  background-color: var(--color-white);
  transition: width var(--transition-base);
}

.approach__link:hover .approach__link-line {
  width: 5rem;
}

.approach__image-wrapper {
  position: relative;
  width: 100%;
  height: 28rem;
  overflow: hidden;
  border: 1px solid var(--color-border);
}

@media (min-width: 1024px) {
  .approach__image-wrapper {
    height: 37.5rem;
  }
}

.approach__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(100%);
  transition: filter var(--transition-reveal);
}

.approach__image-wrapper:hover .approach__image {
  filter: grayscale(0%);
}


/* --------------------------------------------------------------------------
   7. EXPERTISE
   -------------------------------------------------------------------------- */

.expertise {
  padding: var(--space-32) 0;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.expertise__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.expertise__bg-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.expertise__bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    rgba(5, 5, 5, 0.88),
    rgba(5, 5, 5, 0.95)
  );
}

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

.expertise__header {
  margin-bottom: var(--space-20);
}

.expertise__eyebrow {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semi);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-gray-400);
  margin-bottom: var(--space-4);
}

.expertise__title {
  font-size: clamp(2rem, 4vw, var(--text-5xl));
  font-weight: var(--font-weight-light);
  color: var(--color-white);
}

.expertise__title strong {
  font-weight: var(--font-weight-semi);
}

.expertise__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-16) var(--space-12);
}

@media (min-width: 768px) {
  .expertise__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .expertise__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.expertise__card {
  cursor: default;
}

.expertise__card-line {
  width: 100%;
  height: 1px;
  background-color: var(--color-border);
  margin-bottom: var(--space-8);
  transition: background-color var(--transition-base);
}

.expertise__card:hover .expertise__card-line {
  background-color: var(--color-white);
}

.expertise__card-title {
  font-size: var(--text-2xl);
  font-weight: var(--font-weight-medium);
  color: var(--color-white);
  margin-bottom: var(--space-4);
}

.expertise__card-text {
  font-weight: var(--font-weight-light);
  line-height: 1.7;
  color: var(--color-gray-400);
}


/* --------------------------------------------------------------------------
   8. INSIGHT (Quote)
   -------------------------------------------------------------------------- */

.insight {
  padding: var(--space-40) 0;
  background-color: var(--color-black);
}

.insight__inner {
  max-width: 52rem;
  margin: 0 auto;
  text-align: center;
}

.insight__quote {
  font-size: clamp(1.5rem, 3.5vw, var(--text-5xl));
  font-weight: var(--font-weight-light);
  line-height: 1.3;
  color: var(--color-white);
  margin-bottom: var(--space-10);
}

.insight__quote em {
  font-weight: var(--font-weight-semi);
  font-style: italic;
}

.insight__attribution {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semi);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-gray-500);
}


/* --------------------------------------------------------------------------
   9. CONTACT
   -------------------------------------------------------------------------- */

.contact {
  padding: var(--space-32) 0;
  background-color: var(--color-black-soft);
  border-top: 1px solid var(--color-border);
}

.contact__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-16);
}

@media (min-width: 1024px) {
  .contact__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-20);
  }
}

.contact__title {
  font-size: var(--text-4xl);
  font-weight: var(--font-weight-light);
  color: var(--color-white);
  margin-bottom: var(--space-6);
}

.contact__description {
  font-weight: var(--font-weight-light);
  color: var(--color-gray-400);
  margin-bottom: var(--space-12);
  max-width: 28rem;
}

.contact__info-block {
  margin-bottom: var(--space-6);
}

.contact__info-label {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semi);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: var(--space-2);
}

.contact__info-value {
  font-weight: var(--font-weight-light);
  color: var(--color-white);
  line-height: 1.6;
}

.contact__info-link {
  position: relative;
}

.contact__info-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-white);
  transition: width var(--transition-base);
}

.contact__info-link:hover::after {
  width: 100%;
}

/* Form */
.contact__form-wrapper {
  background-color: var(--color-surface);
  padding: var(--space-10);
  border: 1px solid var(--color-border);
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: var(--space-8);
}

.contact__form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .contact__form-row {
    grid-template-columns: 1fr 1fr;
  }
}

.contact__form-group label {
  display: block;
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semi);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-bottom: var(--space-2);
}

.contact__form-group input,
.contact__form-group textarea {
  width: 100%;
  background-color: transparent;
  border: none;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-white);
  padding: var(--space-2) 0;
  transition: border-color var(--transition-base);
  border-radius: 0;
}

.contact__form-group input:focus,
.contact__form-group textarea:focus {
  border-color: var(--color-white);
}

.contact__form-group textarea {
  resize: none;
  min-height: 6rem;
}

.contact__form-submit {
  width: 100%;
  padding: var(--space-4) 0;
  border: 1px solid var(--color-white);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semi);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-white);
  background-color: transparent;
  transition: background-color var(--transition-base),
              color var(--transition-base);
}

.contact__form-submit:hover {
  background-color: var(--color-white);
  color: var(--color-black);
}

/* Success / Error states */
.contact__form-feedback {
  display: none;
  text-align: center;
  padding: var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-weight-medium);
  letter-spacing: 0.05em;
}

.contact__form-feedback--success {
  display: block;
  color: #4ade80;
  border: 1px solid rgba(74, 222, 128, 0.3);
}

.contact__form-feedback--error {
  display: block;
  color: #f87171;
  border: 1px solid rgba(248, 113, 113, 0.3);
}


/* --------------------------------------------------------------------------
   10. FOOTER
   -------------------------------------------------------------------------- */

.footer {
  padding: var(--space-12) 0;
  background-color: var(--color-black);
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  text-align: center;
}

@media (min-width: 768px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.footer__logo {
  font-size: var(--text-xl);
  font-weight: var(--font-weight-bold);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-white);
}

.footer__copyright {
  font-size: var(--text-xs);
  color: var(--color-gray-500);
}

.footer__links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}

.footer__link {
  font-size: var(--text-xs);
  font-weight: var(--font-weight-semi);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-white);
}


/* --------------------------------------------------------------------------
   11. SCROLL REVEAL (JS-driven)
   -------------------------------------------------------------------------- */

.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--transition-reveal),
              transform var(--transition-reveal);
}

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

.reveal--delay-1 { transition-delay: 100ms; }
.reveal--delay-2 { transition-delay: 200ms; }
.reveal--delay-3 { transition-delay: 300ms; }
.reveal--delay-4 { transition-delay: 400ms; }
.reveal--delay-5 { transition-delay: 500ms; }
.reveal--delay-6 { transition-delay: 600ms; }


/* --------------------------------------------------------------------------
   12. UTILITIES
   -------------------------------------------------------------------------- */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

.text-balance {
  text-wrap: balance;
}


/* --------------------------------------------------------------------------
   13. METRICS
   -------------------------------------------------------------------------- */

.metrics {
  padding: var(--space-16) 0;
  background-color: var(--color-black);
  border-bottom: 1px solid var(--color-border);
}

.metrics__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-8);
  text-align: center;
}

@media (min-width: 768px) {
  .metrics__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.metrics__value {
  font-size: clamp(2.5rem, 5vw, var(--text-5xl));
  font-weight: var(--font-weight-light);
  color: var(--color-white);
  letter-spacing: -0.02em;
}

.metrics__label {
  font-size: var(--text-sm);
  font-weight: var(--font-weight-semi);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gray-500);
  margin-top: var(--space-2);
}