/* ============================================
   VoltLogic Tech Holdings — Design System
   ============================================ */

:root {
  --color-bg: #06060a;
  --color-bg-elevated: rgba(255, 255, 255, 0.03);
  --color-surface: rgba(255, 255, 255, 0.04);
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(0, 229, 255, 0.35);
  --color-text: #f0f0f5;
  --color-text-muted: rgba(240, 240, 245, 0.55);
  --color-text-subtle: rgba(240, 240, 245, 0.35);
  --color-accent: #00e5ff;
  --color-accent-secondary: #7c3aed;
  --color-accent-glow: rgba(0, 229, 255, 0.15);
  --color-unifidy: #00e5ff;
  --color-joltryde: #a78bfa;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Orbitron', var(--font-sans);

  --container-max: 1120px;
  --header-height: 72px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;

  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---- Reset & Base ---- */

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

/* ---- Background Effects ---- */

.bg-glow {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
  filter: blur(120px);
}

.bg-glow--1 {
  top: -20%;
  left: -10%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.08) 0%, transparent 70%);
}

.bg-glow--2 {
  bottom: -15%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(124, 58, 237, 0.07) 0%, transparent 70%);
}

.grid-overlay {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 20%, transparent 80%);
}

/* ---- Layout ---- */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.5rem);
}

/* ---- Header ---- */

.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(6, 6, 10, 0.72);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  transition: opacity var(--transition-fast);
}

.logo:hover {
  opacity: 0.85;
}

.logo__mark {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
}

.logo__text {
  font-family: var(--font-display);
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.logo__accent {
  color: var(--color-accent);
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-muted);
  padding: 0.5rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  backdrop-filter: blur(12px);
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast),
    background var(--transition-fast),
    box-shadow var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
  box-shadow: 0 0 20px var(--color-accent-glow);
}

/* ---- Hero ---- */

.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--header-height);
}

.hero__content {
  padding-block: clamp(4rem, 12vh, 8rem);
}

.hero__eyebrow {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 1.5rem;
}

.hero__title {
  font-size: clamp(2.25rem, 5.5vw, 4rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero__title-accent {
  background: linear-gradient(135deg, var(--color-text) 30%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.1875rem);
  font-weight: 400;
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 560px;
}

/* ---- Portfolio ---- */

.portfolio {
  position: relative;
  z-index: 1;
  padding-block: clamp(4rem, 10vh, 7rem);
}

.portfolio__header {
  text-align: center;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.portfolio__title {
  font-family: var(--font-display);
  font-size: clamp(0.8125rem, 1.5vw, 0.875rem);
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-subtle);
  margin-bottom: 0.75rem;
}

.portfolio__desc {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  font-weight: 500;
  color: var(--color-text);
}

.portfolio__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(1.25rem, 3vw, 2rem);
}

/* ---- Cards ---- */

.card {
  position: relative;
  border-radius: var(--radius-lg);
  isolation: isolate;
}

.card__glow {
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  opacity: 0;
  transition: opacity var(--transition-smooth);
  z-index: -1;
}

.card:first-child .card__glow {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.3), transparent 60%);
}

.card:last-child .card__glow {
  background: linear-gradient(135deg, rgba(167, 139, 250, 0.3), transparent 60%);
}

.card__inner {
  position: relative;
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: clamp(1.75rem, 4vw, 2.5rem);
  background: var(--color-bg-elevated);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid var(--color-border);
  border-radius: inherit;
  transition:
    transform var(--transition-smooth),
    border-color var(--transition-smooth),
    box-shadow var(--transition-smooth);
}

.card:hover .card__inner {
  transform: translateY(-4px);
  border-color: var(--color-border-hover);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.4),
    0 0 0 1px rgba(255, 255, 255, 0.04) inset;
}

.card:hover .card__glow {
  opacity: 1;
}

.card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  margin-bottom: 1.5rem;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  transition:
    border-color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.card__icon--unifidy {
  color: var(--color-unifidy);
}

.card__icon--joltryde {
  color: var(--color-joltryde);
}

.card:hover .card__icon--unifidy {
  border-color: rgba(0, 229, 255, 0.3);
  box-shadow: 0 0 24px rgba(0, 229, 255, 0.12);
}

.card:hover .card__icon--joltryde {
  border-color: rgba(167, 139, 250, 0.3);
  box-shadow: 0 0 24px rgba(167, 139, 250, 0.12);
}

.card__name {
  font-size: clamp(1.375rem, 2.5vw, 1.625rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.375rem;
}

.card__tagline {
  font-family: var(--font-display);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: 1rem;
}

.card:first-child .card__tagline {
  color: var(--color-unifidy);
}

.card:last-child .card__tagline {
  color: var(--color-joltryde);
}

.card__description {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--color-text-muted);
  flex: 1;
  margin-bottom: 2rem;
}

.card__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  padding: 0.75rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: rgba(255, 255, 255, 0.03);
  align-self: flex-start;
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast),
    background var(--transition-fast),
    gap var(--transition-spring);
}

.card__cta svg {
  transition: transform var(--transition-spring);
}

.card:first-child:hover .card__cta {
  border-color: rgba(0, 229, 255, 0.4);
  background: rgba(0, 229, 255, 0.06);
}

.card:last-child:hover .card__cta {
  border-color: rgba(167, 139, 250, 0.4);
  background: rgba(167, 139, 250, 0.06);
}

.card__cta:hover {
  gap: 0.75rem;
}

.card__cta:hover svg {
  transform: translateX(3px);
}

/* ---- Footer ---- */

.footer {
  position: relative;
  z-index: 1;
  padding-block: clamp(2.5rem, 5vh, 4rem);
  border-top: 1px solid var(--color-border);
}

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

.footer__copyright {
  font-size: 0.8125rem;
  color: var(--color-text-subtle);
}

.footer__email {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

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

/* ---- Scroll Animations ---- */

.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1),
    transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.fade-in:nth-child(2) { transition-delay: 0.1s; }
.fade-in:nth-child(3) { transition-delay: 0.2s; }

.portfolio__grid .fade-in:nth-child(1) { transition-delay: 0.05s; }
.portfolio__grid .fade-in:nth-child(2) { transition-delay: 0.15s; }

/* ---- Responsive ---- */

@media (max-width: 768px) {
  .portfolio__grid {
    grid-template-columns: 1fr;
  }

  .hero__title br {
    display: none;
  }

  .card:hover .card__inner {
    transform: none;
  }
}

@media (max-width: 480px) {
  .logo__text {
    font-size: 0.8125rem;
  }

  .nav-link {
    padding: 0.4375rem 0.875rem;
    font-size: 0.8125rem;
  }
}

/* ---- Reduced Motion ---- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .card__inner,
  .card__cta,
  .card__cta svg,
  .nav-link,
  .logo {
    transition: none;
  }

  .card:hover .card__inner {
    transform: none;
  }
}