/* ============================================
   DESIGN TOKENS
   ============================================ */
:root {
  /* Typography */
  --font-display: 'Roboto Condensed', 'Helvetica Neue', sans-serif;
  --font-body: 'Roboto Condensed', 'Helvetica Neue', sans-serif;
  --font-reading: 'Roboto', 'Helvetica Neue', sans-serif;

  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);
  --text-hero: clamp(3rem,     0.5rem  + 7vw,    8rem);

  /* Spacing */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Monochrome palette */
  --color-bg: #000000;
  --color-surface: #0a0a0a;
  --color-surface-2: #141414;
  --color-text: #ffffff;
  --color-text-muted: #999999;
  --color-text-secondary: #999999;
  --color-text-faint: #555555;
  --color-border: rgba(255,255,255,0.1);
  --color-divider: rgba(255,255,255,0.06);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ============================================
   APP SHELL
   ============================================ */
#app {
  width: 100vw;
  height: 100dvh;
  overflow: hidden;
  position: relative;
}

/* ============================================
   HEADER
   ============================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 70;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: var(--space-4) var(--space-6);
  pointer-events: none;
  opacity: 0;
}

.header.visible {
  animation: headerFadeIn 5s ease forwards;
}

.header.visible > * {
  pointer-events: auto;
}

.header__logo {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 300;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #fff;
  line-height: 1;
}

.header__content {
  display: flex;
  flex-direction: column;
}

.header__subtitle {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 300;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-top: 0.25em;
  line-height: 1;
}

/* ============================================
   SOCIAL LINKS
   ============================================ */
.social-links {
  position: fixed;
  top: var(--space-6);
  left: var(--space-6);
  z-index: 80;
  display: flex;
  flex-direction: column;
  gap: 24px;
  opacity: 0;
  pointer-events: none;
}

.social-links.visible {
  animation: headerFadeIn 5s ease forwards;
  pointer-events: auto;
}

.social-links__item {
  display: block;
  width: 24px;
  height: 24px;
  opacity: 0.8;
  transition: opacity var(--transition-interactive);
}

.social-links__item:hover {
  opacity: 1;
}

.social-links__item img {
  width: 24px;
  height: 24px;
  display: block;
}

/* ============================================
   ART FOUNDATION HOME — Full-screen hero
   ============================================ */
.art-home {
  position: fixed;
  inset: 0;
  z-index: 55;
  overflow: hidden;
  background: #000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.8s var(--ease-out);
}

.art-home.active {
  opacity: 1;
  pointer-events: auto;
}

.art-home__bg {
  position: absolute;
  inset: -10%;
  width: 120%;
  height: 120%;
  background-size: cover;
  background-position: center;
  animation: heroBreathing 18s var(--ease-in-out) infinite alternate;
}

/* Animated atmospheric gradient hero — colors from paniaras-blue-03.png */
.art-home__bg.hero-gradient {
  background-color: #000030;
  animation: none;
}

.art-home__bg.hero-gradient::before,
.art-home__bg.hero-gradient::after {
  content: '';
  position: absolute;
  inset: -50%;
  width: 200%;
  height: 200%;
  border-radius: 50%;
  mix-blend-mode: screen;
  filter: blur(80px);
  opacity: 0.8;
}

.art-home__bg.hero-gradient::before {
  background:
    radial-gradient(ellipse 60% 50% at 20% 30%, #184890 0%, transparent 70%),
    radial-gradient(ellipse 50% 60% at 80% 20%, #003090 0%, transparent 65%),
    radial-gradient(ellipse 70% 40% at 50% 70%, #000060 0%, transparent 60%);
  animation: cloudDrift1 20s ease-in-out infinite alternate;
}

.art-home__bg.hero-gradient::after {
  background:
    radial-gradient(ellipse 55% 55% at 70% 60%, #306090 0%, transparent 65%),
    radial-gradient(ellipse 45% 65% at 30% 80%, #7890a8 0%, transparent 60%),
    radial-gradient(ellipse 60% 50% at 60% 30%, #001860 0%, transparent 70%);
  animation: cloudDrift2 28s ease-in-out infinite alternate;
}

/* Third layer via a child element for extra depth */
.hero-gradient-layer {
  position: absolute;
  inset: -50%;
  width: 200%;
  height: 200%;
  border-radius: 40%;
  background:
    radial-gradient(ellipse 50% 70% at 40% 50%, #6078a8 0%, transparent 55%),
    radial-gradient(ellipse 65% 45% at 75% 40%, #003078 0%, transparent 60%),
    radial-gradient(ellipse 40% 55% at 20% 70%, #000048 0%, transparent 70%);
  mix-blend-mode: screen;
  filter: blur(100px);
  opacity: 0.6;
  animation: cloudDrift3 35s ease-in-out infinite alternate;
}

@keyframes cloudDrift1 {
  0%   { transform: translate(0%, 0%) rotate(0deg) scale(1); }
  33%  { transform: translate(8%, -5%) rotate(3deg) scale(1.05); }
  66%  { transform: translate(-5%, 8%) rotate(-2deg) scale(0.95); }
  100% { transform: translate(3%, -3%) rotate(1deg) scale(1.02); }
}

@keyframes cloudDrift2 {
  0%   { transform: translate(0%, 0%) rotate(0deg) scale(1); }
  25%  { transform: translate(-8%, 6%) rotate(-3deg) scale(1.08); }
  50%  { transform: translate(6%, -8%) rotate(2deg) scale(0.92); }
  75%  { transform: translate(-3%, 4%) rotate(-1deg) scale(1.04); }
  100% { transform: translate(5%, -5%) rotate(2deg) scale(1); }
}

@keyframes cloudDrift3 {
  0%   { transform: translate(0%, 0%) rotate(0deg) scale(1); }
  20%  { transform: translate(6%, 4%) rotate(2deg) scale(1.06); }
  40%  { transform: translate(-4%, -6%) rotate(-3deg) scale(0.94); }
  60%  { transform: translate(3%, 7%) rotate(1deg) scale(1.03); }
  80%  { transform: translate(-7%, -3%) rotate(-2deg) scale(0.97); }
  100% { transform: translate(2%, -2%) rotate(1deg) scale(1.01); }
}



.art-home__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    rgba(0, 0, 0, 0.6) 0%,
    rgba(0, 0, 0, 0.15) 50%,
    rgba(0, 0, 0, 0.3) 100%
  );
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 70;
  padding: var(--space-4) var(--space-6);
  font-family: var(--font-reading);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  opacity: 0;
  pointer-events: none;
}

.footer.visible {
  animation: headerFadeIn 5s ease forwards;
  pointer-events: auto;
}

/* ============================================
   KEYFRAMES
   ============================================ */
@keyframes heroBreathing {
  0%   { transform: scale(1); }
  100% { transform: scale(1.08); }
}

@keyframes headerFadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .header__logo,
  .header__subtitle {
    font-size: var(--text-xl);
  }
}

@media (max-width: 768px) {
  .header {
    padding: var(--space-4) var(--space-4);
  }

  .header__logo,
  .header__subtitle {
    font-size: var(--text-xl);
  }
}

@media (max-width: 480px) {
  .header__logo,
  .header__subtitle {
    font-size: var(--text-xl);
    letter-spacing: 0.05em;
  }
}