/* ==========================================================================
   Paradius LLC — Landing Page Styles
   Stack: Pure CSS, BEM methodology, CSS Custom Properties
   ========================================================================== */

/* ---------- Fonts ---------- */
@font-face {
  font-family: 'Paradius Dawn';
  src: url('../assets/ParadiusDawn-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}


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

:root {
  /* Colors */
  --color-bg: #000000;
  --color-surface: #0A0A0A;
  --color-divider: #1A1A1A;
  --color-text-primary: #FFFFFF;
  --color-text-secondary: #9CA3AF;
  --color-accent: #C0C8D4;
  --color-accent-dim: rgba(192, 200, 212, 0.12);
  --color-accent-glow: rgba(192, 200, 212, 0.06);

  /* Typography */
  --font-heading: 'Cormorant Garamond', 'Georgia', serif;
  --font-brand: 'Paradius Dawn', 'Cormorant Garamond', 'Georgia', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;
  --space-3xl: 8rem;

  /* Layout */
  --container-max: 1120px;
  --container-padding: 1.5rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

html {
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

html.menu-open {
  overflow: hidden;
}


body {
  position: relative;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: clip;
}

/* Circuit tree: scrolls with content, larger than page for expansion feel.
   Uses mask-image instead of filter:invert for GPU-friendly rendering.
   Two layers: dim base (::after) + shimmer sweep (::before) for pulse. */
body::after {
  content: '';
  position: absolute;
  top: -20vh;
  left: 50%;
  transform: translateX(-50%) translateZ(0);
  width: 195vw;
  height: calc(100% + 40vh);
  background-color: #fff;
  opacity: 0.04;
  pointer-events: none;
  z-index: 0;
  contain: strict;
  -webkit-mask-image: url('../assets/circuit_tree_full.svg');
  -webkit-mask-repeat: no-repeat;
  -webkit-mask-position: center center;
  -webkit-mask-size: contain;
  mask-image: url('../assets/circuit_tree_full.svg');
  mask-repeat: no-repeat;
  mask-position: center center;
  mask-size: contain;
}

/* Shimmer layer: soft heartbeat glow that sweeps slowly bottom→top.
   Combines tree shape + gradient sweep via mask-composite (intersect). */
body::before {
  content: '';
  position: absolute;
  top: -20vh;
  left: 50%;
  transform: translateX(-50%) translateZ(0);
  width: 195vw;
  height: calc(100% + 40vh);
  background-color: #fff;
  opacity: 0.10;
  pointer-events: none;
  z-index: 0;
  will-change: mask-position, -webkit-mask-position;
  contain: strict;
  -webkit-mask-image:
    url('../assets/circuit_tree_full.svg'),
    linear-gradient(
      to top,
      transparent 0%,
      rgba(255,255,255,0.15) 30%,
      rgba(255,255,255,0.4) 45%,
      rgba(255,255,255,0.4) 55%,
      rgba(255,255,255,0.15) 70%,
      transparent 100%
    );
  -webkit-mask-size: contain, 100% 350%;
  -webkit-mask-repeat: no-repeat, no-repeat;
  -webkit-mask-position: center center, center 280%;
  -webkit-mask-composite: source-in;
  mask-image:
    url('../assets/circuit_tree_full.svg'),
    linear-gradient(
      to top,
      transparent 0%,
      rgba(255,255,255,0.15) 30%,
      rgba(255,255,255,0.4) 45%,
      rgba(255,255,255,0.4) 55%,
      rgba(255,255,255,0.15) 70%,
      transparent 100%
    );
  mask-size: contain, 100% 350%;
  mask-repeat: no-repeat, no-repeat;
  mask-position: center center, center 280%;
  mask-composite: intersect;
  animation: tree-pulse 18s ease-in-out infinite;
}

@keyframes tree-pulse {
  0%, 30% {
    -webkit-mask-position: center center, center 280%;
    mask-position: center center, center 280%;
  }
  80%, 100% {
    -webkit-mask-position: center center, center -180%;
    mask-position: center center, center -180%;
  }
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

ul {
  list-style: none;
}

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

::selection {
  background-color: var(--color-accent);
  color: var(--color-bg);
}


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

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


/* ==========================================================================
   HEADER
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding-block: var(--space-sm);
  transition:
    background-color var(--transition-base),
    backdrop-filter var(--transition-base);
}

.header--scrolled {
  background-color: rgba(0, 0, 0, 0.92);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  backdrop-filter: blur(20px) saturate(180%);
}

.header__container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.header__logo {
  display: flex;
  align-items: center;
  color: var(--color-text-primary);
  z-index: 101;
}

.header__logo-svg {
  height: 60px;
  width: auto;
  fill: currentColor;
  vertical-align: middle;
}

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

.header__nav-link {
  font-family: var(--font-brand);
  font-size: 0.875rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.header__nav-link:hover,
.header__nav-link:focus-visible {
  color: var(--color-text-primary);
}

/* Mobile menu toggle */
.header__menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  z-index: 101;
}

.header__menu-bar {
  display: block;
  width: 22px;
  height: 1.5px;
  background-color: var(--color-text-primary);
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.header__menu-toggle--active .header__menu-bar:first-child {
  transform: translateY(3.25px) rotate(45deg);
}

.header__menu-toggle--active .header__menu-bar:last-child {
  transform: translateY(-3.25px) rotate(-45deg);
}


/* ==========================================================================
   HERO
   ========================================================================== */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  min-height: 100dvh;
  padding-block: 10rem 8rem;
  overflow: hidden;
}

.hero__backdrop {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 40%, var(--color-accent-glow), transparent),
    radial-gradient(ellipse 40% 30% at 30% 60%, rgba(192, 200, 212, 0.03), transparent);
  animation: hero-glow 12s ease-in-out infinite alternate;
  pointer-events: none;
  z-index: 0;
  will-change: opacity, transform;
}

@keyframes hero-glow {
  0% {
    opacity: 0.6;
    transform: scale(1);
  }
  100% {
    opacity: 1;
    transform: scale(1.05);
  }
}

.hero__container {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 1500px;
  margin-inline: auto;
  padding-inline: var(--container-padding);
  animation: hero-enter 1s cubic-bezier(0.16, 1, 0.3, 1) 200ms both;
}

@keyframes hero-enter {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Tagline SVG displayed as image */
.hero__tagline {
  display: block;
  width: 50vw;
  max-width: 960px;
  height: auto;
  margin-inline: auto;
  margin-bottom: var(--space-lg);
  filter: brightness(0) invert(1);
}

.hero__subtitle {
  font-family: var(--font-heading);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  font-weight: 400;
  font-style: italic;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  letter-spacing: 0.02em;
  line-height: 1.6;
}

.hero__cta {
  display: inline-block;
  padding: 0.875rem 2.5rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-bg);
  background-color: var(--color-text-primary);
  border: 1px solid var(--color-text-primary);
  transition:
    background-color var(--transition-base),
    color var(--transition-base),
    transform var(--transition-fast);
}

.hero__cta:hover,
.hero__cta:focus-visible {
  background-color: transparent;
  color: var(--color-text-primary);
  transform: translateY(-1px);
}


/* ==========================================================================
   SECTION REVEAL (Scroll Animation)
   ========================================================================== */
.section-reveal {
  opacity: 0;
  transform: translateY(32px);
  transition:
    opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
    transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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


/* ==========================================================================
   PHILOSOPHY
   ========================================================================== */
.philosophy {
  position: relative;
  padding-block: var(--space-3xl);
}

.philosophy__container {
  position: relative;
  z-index: 1;
  max-width: 720px;
  margin-inline: auto;
  padding-inline: var(--container-padding);
  text-align: center;
}

.philosophy__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-xl);
}

.philosophy__text {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  line-height: 1.85;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
}

.philosophy__quote {
  position: relative;
  padding: var(--space-lg) var(--space-xl);
  border-left: 2px solid var(--color-accent);
  background: linear-gradient(90deg, var(--color-accent-dim), transparent);
  text-align: left;
}

.philosophy__quote p {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 1.8vw, 1.35rem);
  font-style: italic;
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-accent);
}


/* ==========================================================================
   EXPERTISE
   ========================================================================== */
.expertise {
  padding-block: var(--space-3xl);
}

.expertise__container {
  position: relative;
  z-index: 1;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
  text-align: center;
}

.expertise__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
  margin-bottom: var(--space-sm);
}

.expertise__subtitle {
  font-size: clamp(1rem, 1.5vw, 1.125rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
}

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


/* ---------- Card ---------- */
.card {
  position: relative;
  z-index: 1;
  text-align: left;
  padding: var(--space-xl) var(--space-lg);
  background-color: var(--color-surface);
  border: 1px solid var(--color-divider);
  transition:
    border-color var(--transition-base),
    transform var(--transition-base),
    box-shadow var(--transition-base);
}

.card:hover {
  border-color: rgba(192, 200, 212, 0.2);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(192, 200, 212, 0.04);
}

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

.card__title {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: var(--space-sm);
  letter-spacing: 0.01em;
}

.card__description {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--color-text-secondary);
}


/* ==========================================================================
   FOOTER
   ========================================================================== */
.footer {
  position: relative;
  z-index: 1;
  padding-block: var(--space-lg);
}

.footer__container {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.footer__brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.5rem;
}

.footer__logo-svg {
  height: 38px;
  width: auto;
  fill: var(--color-text-primary);
}

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

.footer__contact {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.footer__email {
  font-size: 0.875rem;
  color: var(--color-accent);
  letter-spacing: 0.03em;
  transition: color var(--transition-fast);
}

.footer__email:hover,
.footer__email:focus-visible {
  color: var(--color-text-primary);
}

.footer__linkedin {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  letter-spacing: 0.03em;
  transition: color var(--transition-fast);
}

.footer__linkedin:hover,
.footer__linkedin:focus-visible {
  color: var(--color-text-primary);
}

.footer__linkedin-icon {
  width: 16px;
  height: 16px;
}

.footer__copyright {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  opacity: 0.6;
}


/* ==========================================================================
   RESPONSIVE
   ========================================================================== */

/* Medium screens (tablets, small laptops) */
@media (max-width: 1024px) {
  .hero {
    min-height: 70vh;
    min-height: 70dvh;
    padding-block: 8rem 4rem;
  }
}

/* Tablet */
@media (max-width: 768px) {
  :root {
    --space-3xl: 5rem;
    --space-2xl: 3.5rem;
  }

  .hero {
    min-height: auto;
    padding-block: 7rem 2.5rem;
  }

  .hero__tagline {
    max-width: 90vw;
    width: 80vw;
  }

  .hero__subtitle {
    margin-bottom: var(--space-md);
  }

  .hero__cta {
    padding: 0.75rem 2rem;
  }

  body::after,
  body::before {
    width: 220vw;
  }

  body::after {
    opacity: 0.035;
  }

  body::before {
    opacity: 0.08;
  }

  .header--scrolled {
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
    background-color: rgba(0, 0, 0, 0.95);
  }

  .header__logo-svg {
    height: 48px;
  }

  .expertise__grid {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
    max-width: 480px;
    margin-inline: auto;
  }

  .footer__container {
    flex-direction: column;
    text-align: center;
    gap: var(--space-lg);
  }

  .footer__brand {
    align-items: center;
  }

  /* Mobile nav */
  .header__menu-toggle {
    display: flex;
  }

  .header__nav {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #000000;
    opacity: 0;
    visibility: hidden;
    transition:
      opacity var(--transition-base),
      visibility var(--transition-base);
  }

  .header__nav--open {
    opacity: 1;
    visibility: visible;
  }

  .header__nav-list {
    flex-direction: column;
    align-items: center;
    gap: var(--space-xl);
  }

  .header__nav-link {
    font-size: 1.25rem;
    letter-spacing: 0.15em;
  }
}

/* Small mobile */
@media (max-width: 480px) {
  :root {
    --container-padding: 1.25rem;
    --space-3xl: 3rem;
    --space-2xl: 2.5rem;
  }

  .hero {
    min-height: auto;
    padding-block: 5rem 2rem;
  }

  .hero__tagline {
    max-width: 95vw;
    width: 90vw;
  }

  body::after,
  body::before {
    width: 280vw;
  }

  body::after {
    opacity: 0.03;
  }

  body::before {
    opacity: 0.06;
  }

  .header__logo-svg {
    height: 40px;
  }

  .philosophy__quote {
    padding: var(--space-md) var(--space-md);
  }

  .card {
    padding: var(--space-lg) var(--space-md);
  }
}

/* Large screens */
@media (min-width: 1400px) {
  :root {
    --container-max: 1240px;
  }

  .hero__tagline {
    max-width: 1600px;
  }
}


/* ==========================================================================
   ACCESSIBILITY
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }

  .section-reveal {
    opacity: 1;
    transform: none;
  }
}

/* Focus visible styles */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
}