/* ================================================================
   volvox-ltd.com — Design System
   Based on: esprit.md / design-principles.md / ui-mechanics.md
   ================================================================ */

/* --- Design Tokens --- */
:root {
  /* Colors (design-principles §2) */
  --bg-primary:    #FFFFFF;
  --bg-secondary:  #FAFAF8;
  --bg-tertiary:   #F5F3EF;
  --text-primary:  #1A1A1A;
  --text-secondary: #6B6B6B;
  --text-tertiary: #9B9B9B;
  --accent:        #2C2C2C;
  --accent-hover:  #000000;

  /* Borders (ui-mechanics §1.1) */
  --border-default:     0.5px solid rgba(0, 0, 0, 0.08);
  --border-subtle:      0.5px solid rgba(0, 0, 0, 0.04);
  --border-emphasis:    0.5px solid rgba(0, 0, 0, 0.15);
  --border-interactive: 1px solid rgba(0, 0, 0, 0.12);

  /* Fluid type scale (ui-mechanics §4.1) */
  --type-xs:   clamp(0.625rem, 0.56rem + 0.2vw, 0.75rem);
  --type-sm:   clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --type-base: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --type-md:   clamp(1.0rem, 0.9rem + 0.5vw, 1.25rem);
  --type-lg:   clamp(1.25rem, 1.0rem + 0.8vw, 1.563rem);
  --type-xl:   clamp(1.5rem, 1.1rem + 1.2vw, 1.953rem);
  --type-2xl:  clamp(1.75rem, 1.2rem + 1.8vw, 2.441rem);
  --type-hero: clamp(2.0rem, 1.2rem + 2.5vw, 3.5rem);

  /* Spacing (design-principles §3.1) */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-6:  24px;
  --space-8:  32px;
  --space-12: 48px;
  --space-16: 64px;
  --space-24: 96px;
  --space-32: 128px;

  /* Easing (ui-mechanics §3.1) */
  --ease-out:    cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in:     cubic-bezier(0.55, 0, 1, 0.45);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-snap:   cubic-bezier(0.2, 0, 0, 1);

  /* Duration (ui-mechanics §3.2) */
  --duration-instant: 80ms;
  --duration-fast:    150ms;
  --duration-normal:  250ms;
  --duration-slow:    400ms;
  --duration-gentle:  600ms;

  /* Layout */
  --content-max:  1120px;
  --prose-max:    720px;
  --gutter:       24px;
}


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

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


/* --- Base --- */
body {
  font-family: "Cormorant Garamond", "Shippori Mincho", serif;
  font-size: var(--type-base);
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
  transition: opacity var(--duration-fast) var(--ease-snap);
}

a:hover {
  opacity: 0.6;
}

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

ul, ol {
  list-style: none;
}


/* --- Layout Utilities --- */
.container {
  width: 100%;
  max-width: var(--content-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.container--narrow {
  max-width: var(--prose-max);
}


/* ================================================================
   HEADER
   ================================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background-color: var(--bg-primary);
  border-bottom: var(--border-default);
}

.site-header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-4) var(--gutter);
}

/* Logo */
.site-header__logo {
  display: block;
  line-height: 1;
}

.site-header__logo img {
  height: 40px;
  width: auto;
}

/* Hamburger */
.hamburger {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
  position: relative;
  z-index: 60;
  -webkit-tap-highlight-color: transparent;
}

.hamburger__line,
.hamburger__line::before,
.hamburger__line::after {
  display: block;
  width: 28px;
  height: 1px;
  background: var(--text-primary);
  transition: transform var(--duration-normal) var(--ease-out),
              opacity var(--duration-fast) var(--ease-snap);
  position: absolute;
}

.hamburger__line::before,
.hamburger__line::after {
  content: '';
}

.hamburger__line::before {
  transform: translateY(-8px);
}

.hamburger__line::after {
  transform: translateY(8px);
}

/* Hamburger active state */
.hamburger.is-active .hamburger__line {
  background: transparent;
}

.hamburger.is-active .hamburger__line::before {
  transform: rotate(45deg);
  background: var(--text-primary);
}

.hamburger.is-active .hamburger__line::after {
  transform: rotate(-45deg);
  background: var(--text-primary);
}

/* Mobile Nav Overlay */
.nav-overlay {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgba(255, 255, 255, 0.97);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-normal) var(--ease-out),
              visibility var(--duration-normal) var(--ease-out);
}

.nav-overlay.is-open {
  opacity: 1;
  visibility: visible;
}

.nav-overlay__list {
  text-align: center;
}

.nav-overlay__item {
  margin-bottom: var(--space-6);
}

.nav-overlay__link {
  font-family: "Cormorant Garamond", serif;
  font-size: var(--type-lg);
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--text-primary);
  text-decoration: none;
  transition: opacity var(--duration-fast) var(--ease-snap);
}

.nav-overlay__link:hover {
  opacity: 0.5;
}


/* ================================================================
   HERO SECTION
   ================================================================ */
.hero {
  padding-top: var(--space-32);
  padding-bottom: var(--space-24);
  background-color: var(--bg-primary);
  text-align: center;
}

.hero__title {
  font-family: "Cormorant Garamond", serif;
  font-size: var(--type-hero);
  font-weight: 300;
  letter-spacing: 0.08em;
  line-height: 1.15;
  color: var(--text-primary);
  margin-bottom: var(--space-8);
}

.hero__subtitle {
  font-family: "Cormorant Garamond", serif;
  font-size: var(--type-md);
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--text-secondary);
  margin-bottom: var(--space-12);
}

.hero__body {
  max-width: var(--prose-max);
  margin-left: auto;
  margin-right: auto;
  font-size: var(--type-base);
  line-height: 1.85;
  color: var(--text-secondary);
}


/* ================================================================
   ABOUT SECTION (Company Info)
   ================================================================ */
.about {
  padding-top: var(--space-24);
  padding-bottom: var(--space-24);
  background-color: var(--bg-secondary);
}

.about__heading {
  font-family: "Cormorant Garamond", serif;
  font-size: var(--type-xl);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin-bottom: var(--space-12);
  text-align: center;
}

/* Definition list for company info */
.info-list {
  max-width: var(--prose-max);
  margin-left: auto;
  margin-right: auto;
}

.info-list__row {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: var(--border-subtle);
  align-items: baseline;
}

.info-list__row:last-child {
  border-bottom: none;
}

.info-list__term {
  font-size: var(--type-sm);
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.02em;
}

.info-list__desc {
  font-size: var(--type-base);
  color: var(--text-primary);
}

.info-list__desc ul {
  padding-left: 1.2em;
  list-style: disc;
}

.info-list__desc ul li {
  margin-bottom: var(--space-1);
  line-height: 1.7;
}


/* ================================================================
   PROJECTS SECTION
   ================================================================ */
.projects {
  padding-top: var(--space-24);
  padding-bottom: var(--space-24);
  background-color: var(--bg-primary);
}

.projects__heading {
  font-family: "Cormorant Garamond", serif;
  font-size: var(--type-xl);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.25;
  margin-bottom: var(--space-12);
  text-align: center;
}

.projects__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-8);
  max-width: var(--content-max);
  margin: 0 auto;
}

.project-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-6);
  border-radius: 4px;
  text-decoration: none;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.project-card:hover {
  opacity: 0.7;
}

.project-card__logo {
  height: 40px;
  width: auto;
  margin-bottom: var(--space-3);
  object-fit: contain;
}

.project-card__logo-text {
  font-family: "Helvetica Neue", "Arial", sans-serif;
  font-size: var(--type-md);
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  height: 40px;
  display: flex;
  align-items: center;
  margin-bottom: var(--space-3);
}

.project-card__desc {
  font-size: var(--type-xs);
  color: var(--text-tertiary);
  line-height: 1.6;
}


/* ================================================================
   CLIENTS SECTION
   ================================================================ */
.clients {
  padding-top: var(--space-24);
  padding-bottom: var(--space-24);
  background-color: var(--text-primary);
}

.clients__heading {
  font-family: "Cormorant Garamond", serif;
  font-size: var(--type-xl);
  font-weight: 400;
  letter-spacing: 0.06em;
  line-height: 1.25;
  margin-bottom: var(--space-12);
  text-align: center;
  color: rgba(255, 255, 255, 0.4);
}

.clients__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--space-8) var(--space-6);
  max-width: var(--content-max);
  margin: 0 auto;
  align-items: center;
  justify-items: center;
}

.clients__logo {
  height: 28px;
  width: auto;
  max-width: 120px;
  object-fit: contain;
  filter: brightness(0) invert(1);
  opacity: 0.35;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.clients__logo:hover {
  opacity: 0.7;
}


/* ================================================================
   FOOTER
   ================================================================ */
.site-footer {
  border-top: var(--border-default);
  background-color: var(--bg-tertiary);
  padding: 0;
}

.site-footer__main {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-8);
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--space-16) var(--gutter);
}

/* Footer - Company Column */
.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.footer-brand__logo {
  height: 28px;
  width: auto;
  margin-bottom: var(--space-6);
}

.footer-brand__address {
  font-size: var(--type-xs);
  color: var(--text-tertiary);
  line-height: 1.8;
  font-style: normal;
}

/* Footer - Nav Columns */
.footer-nav__heading {
  display: block;
  font-family: "Cormorant Garamond", serif;
  font-size: var(--type-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: var(--space-4);
}

.footer-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-nav__link {
  font-size: var(--type-sm);
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-snap);
}

.footer-nav__link:hover {
  color: var(--text-primary);
  opacity: 1;
}

/* Footer - Bottom Bar */
.site-footer__bottom {
  border-top: var(--border-subtle);
  padding: var(--space-4) var(--gutter);
  max-width: var(--content-max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.site-footer__copy {
  font-family: "Cormorant Garamond", serif;
  font-size: var(--type-xs);
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
}


/* ================================================================
   PROSE (Legal Pages: privacy, terms, law)
   ================================================================ */
.prose {
  max-width: var(--prose-max);
  margin-left: auto;
  margin-right: auto;
  padding: var(--space-16) var(--gutter) var(--space-24);
}

.prose__title {
  font-family: "Cormorant Garamond", "Shippori Mincho", serif;
  font-size: var(--type-2xl);
  font-weight: 400;
  letter-spacing: -0.01em;
  line-height: 1.3;
  text-align: center;
  margin-bottom: var(--space-12);
}

.prose h2 {
  font-size: var(--type-lg);
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.4;
  margin-top: var(--space-12);
  margin-bottom: var(--space-4);
  padding-top: var(--space-4);
  border-top: var(--border-subtle);
}

.prose h3 {
  font-size: var(--type-md);
  font-weight: 500;
  line-height: 1.4;
  margin-top: var(--space-8);
  margin-bottom: var(--space-3);
}

.prose p {
  margin-bottom: var(--space-4);
}

.prose ul,
.prose ol {
  padding-left: 1.5em;
  margin-bottom: var(--space-4);
}

.prose ul {
  list-style: disc;
}

.prose ol {
  list-style: decimal;
}

.prose li {
  margin-bottom: var(--space-2);
  line-height: 1.75;
}

.prose a {
  color: var(--accent);
}


/* ================================================================
   CONTACT
   ================================================================ */
.contact {
  padding: var(--space-16) var(--gutter) var(--space-24);
  text-align: center;
}

.contact__heading {
  font-family: "Cormorant Garamond", "Shippori Mincho", serif;
  font-size: var(--type-2xl);
  font-weight: 400;
  letter-spacing: -0.01em;
  margin-bottom: var(--space-8);
}

.contact__body {
  max-width: var(--prose-max);
  margin: 0 auto;
  font-size: var(--type-base);
  color: var(--text-secondary);
  line-height: 1.85;
}

.contact__body p {
  margin-bottom: var(--space-4);
}

.contact__body a {
  color: var(--accent);
}


/* ================================================================
   FORM (for future use)
   ================================================================ */
form {
  width: 100%;
  max-width: var(--prose-max);
  margin: 0 auto;
}

form div {
  margin-bottom: var(--space-6);
}

form label {
  display: block;
  font-size: var(--type-xs);
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--text-secondary);
  margin-bottom: var(--space-1);
}

form label .required {
  color: var(--text-secondary);
  margin-left: var(--space-1);
}

form input[type="text"],
form input[type="email"],
form input[type="tel"],
form textarea,
form select {
  width: 100%;
  padding: var(--space-2) 0;
  font-family: "Shippori Mincho", serif;
  font-size: var(--type-base);
  border: none;
  border-bottom: var(--border-default);
  background: transparent;
  transition: border-color var(--duration-fast) var(--ease-out);
  border-radius: 0;
  -webkit-appearance: none;
  appearance: none;
}

form input:focus,
form textarea:focus,
form select:focus {
  outline: none;
  border-bottom-color: var(--text-primary);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

/* Buttons */
.btn-primary {
  display: inline-block;
  background: var(--text-primary);
  color: #FFFFFF;
  border: none;
  border-radius: 4px;
  padding: var(--space-2) var(--space-6);
  font-family: "Shippori Mincho", serif;
  font-size: var(--type-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: background var(--duration-fast) var(--ease-snap),
              transform var(--duration-instant) var(--ease-snap);
}

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

.btn-primary:active {
  transform: scale(0.97);
}

.btn-secondary {
  display: inline-block;
  background: transparent;
  color: var(--text-primary);
  border: var(--border-interactive);
  border-radius: 4px;
  padding: var(--space-2) var(--space-6);
  font-family: "Shippori Mincho", serif;
  font-size: var(--type-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-snap);
}

.btn-secondary:hover {
  background: var(--text-primary);
  color: #FFFFFF;
}

.btn-secondary:active {
  transform: scale(0.97);
}

.button-group {
  display: flex;
  justify-content: center;
  gap: var(--space-4);
  margin-top: var(--space-6);
}


/* ================================================================
   REVEAL ANIMATION (IntersectionObserver)
   ================================================================ */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--duration-gentle) var(--ease-out),
              transform var(--duration-gentle) var(--ease-out);
}

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

/* Stagger delays for sequential elements */
.reveal[data-delay="1"] { transition-delay: 50ms; }
.reveal[data-delay="2"] { transition-delay: 100ms; }
.reveal[data-delay="3"] { transition-delay: 150ms; }
.reveal[data-delay="4"] { transition-delay: 200ms; }

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}


/* ================================================================
   RESPONSIVE — Mobile First Overrides
   ================================================================ */
@media (max-width: 768px) {
  :root {
    --gutter: 20px;
  }

  /* Header */
  .site-header__logo img {
    height: 28px;
  }

  /* Hero */
  .hero {
    padding-top: var(--space-24);
    padding-bottom: var(--space-16);
  }

  /* About */
  .about {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }

  .info-list__row {
    grid-template-columns: 1fr;
    gap: var(--space-1);
    padding: var(--space-3) 0;
  }

  .info-list__term {
    font-size: var(--type-xs);
    color: var(--text-tertiary);
  }

  /* Projects */
  .projects {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }

  .projects__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }

  .project-card {
    padding: var(--space-4);
  }

  /* Clients */
  .clients {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
  }

  .clients__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6) var(--space-4);
  }

  .clients__logo {
    height: 22px;
    max-width: 100px;
  }

  /* Footer */
  .site-footer__main {
    grid-template-columns: 1fr;
    gap: var(--space-8);
    padding: var(--space-12) var(--gutter);
  }

  .site-footer__bottom {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }

  /* Prose */
  .prose {
    padding: var(--space-12) var(--gutter) var(--space-16);
  }

  /* Contact */
  .contact {
    padding: var(--space-12) var(--gutter) var(--space-16);
  }
}

@media (max-width: 480px) {
  .projects__grid {
    grid-template-columns: 1fr;
  }
}