/* ============================================================
   BIRDHAUS - styles.css
   A lost Bauhaus exhibition poster, EST. 2026.
   ============================================================ */

/* ---- PALETTE & TOKENS ---- */
:root {
  --cream:    #F4F1EA;  /* off-white paper */
  --black:    #141414;  /* ink */
  --charcoal: #3A3A3A;  /* geometric shapes */
  --gray:     #8A857B;  /* muted rules / secondary text */
  --taupe:    #9B9082;  /* warm taupe - the textile/tufted mid-tone */
  --red:      #C0382B;  /* the one strong red sun (matches the rug red) */
  --blue:     #2A3A66;  /* optional deep blue accent */

  --rule:     1px;      /* thin rule weight */
  --maxw:     1100px;   /* content max width */
  --gutter:   clamp(1.25rem, 5vw, 4rem);

  /* System font stack. To add a real font later (e.g. a condensed
     grotesque like "Archivo" or "Oswald"), load it via <link> in
     index.html and prepend it here - the stack remains a fallback. */
  --font-display: "Helvetica Neue", "Arial Narrow", Helvetica, Arial, sans-serif;
  --font-body:    system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

/* ---- RESET ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--cream);
  color: var(--black);
  font-family: var(--font-body);
  line-height: 1.5;
  /* faint paper texture via layered gradients - no image assets */
  background-image:
    radial-gradient(circle at 80% 12%, rgba(0,0,0,0.015) 0, transparent 60%),
    radial-gradient(circle at 10% 90%, rgba(0,0,0,0.02) 0, transparent 55%);
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; }

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

/* ============================================================
   POSTER HERO
   Asymmetric grid: bird occupies the upper-right field, masthead anchors
   the lower-left. Sun + bars float as compositional weights.
   ============================================================ */
.poster {
  position: relative;
  min-height: 100svh;            /* full viewport, modern unit */
  min-height: 100vh;             /* fallback for older browsers */
  overflow: hidden;
  padding: var(--gutter);
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: 1fr auto;
  grid-template-areas:
    "bird bird"
    "mast mast";
  gap: var(--gutter);
  /* a hairline frame, like a printed poster border */
  border: var(--rule) solid var(--black);
  outline: var(--gutter) solid var(--cream); /* breathing room inside viewport */
  outline-offset: calc(-1 * var(--gutter));
}

@media (min-width: 760px) {
  .poster {
    grid-template-areas:
      "mast bird"
      "mast bird";
  }
}

/* ---- MASTHEAD / TITLE BLOCK ---- */
.masthead {
  grid-area: mast;
  align-self: end;
  position: relative;
  z-index: 3;
}

.title {
  font-family: var(--font-display);
  font-weight: 800;
  /* big, bold, condensed feel */
  font-size: clamp(3.25rem, 16vw, 11rem);
  line-height: 0.82;
  letter-spacing: -0.02em;
  margin: 0;
  transform: scaleY(1.08);        /* fake-condense -> taller letterforms */
  transform-origin: bottom left;
  text-transform: uppercase;
}

.subtitle {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: clamp(0.9rem, 2.4vw, 1.4rem);
  margin: 1.1rem 0 0;
  /* red underline rule */
  display: inline-block;
  border-bottom: 3px solid var(--red);
  padding-bottom: 0.35rem;
}

.tagline {
  max-width: 34ch;
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  color: var(--charcoal);
  margin: 1.4rem 0 0;
}

.est {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  font-size: 0.85rem;
  margin: 1.6rem 0 0;
  color: var(--blue);
}

/* ---- CROW MARK ---- */
.bird {
  grid-area: bird;
  align-self: center;
  justify-self: end;
  width: min(56vw, 580px);
  z-index: 2;
}
.bird__img {
  width: 100%;
  height: auto;
  /* crow.png has a transparent background, so it sits straight on
     the cream poster. (If you ever swap in a white-bg version,
     add: mix-blend-mode: multiply;) */
}
@media (max-width: 759px) {
  .bird { width: min(72vw, 380px); justify-self: center; }
}

/* ---- RED SUN MOTIF ---- */
.sun {
  position: absolute;
  top: clamp(2rem, 12vh, 9rem);
  right: clamp(1rem, 8vw, 7rem);
  width: clamp(120px, 22vw, 260px);
  aspect-ratio: 1;
  background: var(--red);
  border-radius: 50%;
  z-index: 1;                      /* sits behind the bird */
}

/* ---- VERTICAL BLACK BARS ---- */
.bars {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.bar {
  position: absolute;
  top: 0; bottom: 0;
  width: clamp(8px, 1.1vw, 16px);
  background: var(--black);
}
.bar--1 { left: 18%;  background: var(--black);    opacity: 0.9; }
.bar--2 { left: 22%;  width: 4px; background: var(--gray); }
.bar--3 { right: 30%; background: var(--charcoal); top: 30%; }

/* ---- CHARCOAL TRIANGLE (cubist scaffold) ---- */
.triangle {
  position: absolute;
  bottom: clamp(1rem, 8vh, 6rem);
  right: clamp(1rem, 6vw, 5rem);
  width: 0; height: 0;
  border-left:  clamp(40px, 9vw, 110px) solid transparent;
  border-bottom: clamp(60px, 13vw, 150px) solid var(--blue);
  z-index: 0;
  opacity: 0.85;
}

/* ============================================================
   MANIFESTO
   ============================================================ */
.manifesto {
  max-width: var(--maxw);
  margin: clamp(3rem, 9vw, 7rem) auto;
  padding: 0 var(--gutter);
}
.manifesto__list {
  list-style: none;
  margin: 0; padding: 0;
  display: grid;
  gap: 0;
}
.manifesto__list li {
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  font-size: clamp(1.5rem, 6vw, 3.4rem);
  line-height: 1.05;
  padding: clamp(0.6rem, 1.6vw, 1rem) 0;
  border-bottom: var(--rule) solid var(--black);
}
.manifesto__list li:first-child { border-top: var(--rule) solid var(--black); }
/* alternate a red marker on every other line */
.manifesto__list li:nth-child(even) { color: var(--charcoal); }
.manifesto__list li:nth-child(even)::before {
  content: "";
  display: inline-block;
  width: 0.7em; height: 0.7em;
  margin-right: 0.5em;
  background: var(--red);
  border-radius: 50%;
  vertical-align: 0.02em;
}

/* ============================================================
   COLLECTION
   ============================================================ */
.collection {
  max-width: var(--maxw);
  margin: clamp(3rem, 9vw, 7rem) auto;
  padding: 0 var(--gutter);
}
.collection__heading {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.28em;
  font-size: clamp(0.85rem, 2vw, 1.1rem);
  margin: 0 0 1.5rem;
  color: var(--blue);
}
.collection__list {
  list-style: none;
  margin: 0; padding: 0;
  counter-reset: none;
}
.collection__item a {
  display: flex;
  align-items: baseline;
  gap: clamp(1rem, 4vw, 3rem);
  text-decoration: none;
  padding: clamp(0.7rem, 1.8vw, 1.2rem) 0;
  border-top: var(--rule) solid var(--black);
  transition: padding-left 0.25s ease, background-color 0.25s ease;
}
.collection__list li:last-child a { border-bottom: var(--rule) solid var(--black); }

.collection__no {
  font-family: var(--font-display);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: var(--gray);
  font-size: clamp(0.9rem, 2vw, 1.2rem);
  min-width: 3ch;
}
.collection__name {
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  font-size: clamp(1.4rem, 5vw, 2.6rem);
}

/* hover: slide right, ink fill, red number */
@media (hover: hover) {
  .collection__item a:hover,
  .collection__item a:focus-visible {
    padding-left: clamp(0.8rem, 3vw, 2rem);
    background-color: var(--black);
    color: var(--cream);
    outline: none;
  }
  .collection__item a:hover .collection__no,
  .collection__item a:focus-visible .collection__no { color: var(--red); }
}
/* keyboard focus fallback for non-hover devices */
.collection__item a:focus-visible {
  outline: 3px solid var(--red);
  outline-offset: 2px;
}

/* ---- CTA ---- */
.cta {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: clamp(2rem, 5vw, 3.5rem);
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: clamp(0.85rem, 2vw, 1.05rem);
  text-decoration: none;
  color: var(--cream);
  background: var(--red);
  padding: 0.9rem 1.6rem;
  transition: transform 0.2s ease, background-color 0.2s ease;
}
.cta__arrow { transition: transform 0.2s ease; }
@media (hover: hover) {
  .cta:hover, .cta:focus-visible { background: var(--black); outline: none; }
  .cta:hover .cta__arrow, .cta:focus-visible .cta__arrow { transform: translateX(4px); }
}
.cta:focus-visible { outline: 3px solid var(--blue); outline-offset: 3px; }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(2rem, 6vw, 4rem) var(--gutter) clamp(3rem, 8vw, 5rem);
  display: flex;
  align-items: center;
  gap: 1rem;
  border-top: 3px solid var(--black);
}
.footer__mark {
  width: 18px; height: 18px;
  background: var(--red);
  border-radius: 50%;
  flex: none;
}
.footer p {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: clamp(0.75rem, 1.8vw, 0.95rem);
}

/* ============================================================
   MOTION - entrance animations
   Elements start displaced; script.js adds .is-loaded to <body>.
   ============================================================ */
.sun, .bird .plane, .title, .subtitle {
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* default (pre-load) states */
body:not(.is-loaded) .sun      { transform: scale(0.2); opacity: 0; }
body:not(.is-loaded) .title    { opacity: 0; transform: translateY(18px) scaleY(1.08); }
body:not(.is-loaded) .subtitle { opacity: 0; }
body:not(.is-loaded) .bird .plane { opacity: 0; }

/* loaded states + transitions */
.sun {
  transition: transform 0.9s var(--ease), opacity 0.9s ease;
}
.title {
  transition: opacity 0.8s ease 0.1s, transform 0.8s var(--ease) 0.1s;
}
.subtitle {
  transition: opacity 0.8s ease 0.45s;
}
.bird .plane {
  transition: opacity 0.6s ease calc(var(--i, 0) * 0.09s + 0.3s),
              transform 0.6s var(--ease) calc(var(--i, 0) * 0.09s + 0.3s);
  transform-box: fill-box;
  transform-origin: center;
}
body:not(.is-loaded) .bird .plane { transform: translateY(10px) scale(0.96); }

/* ---- RESPECT REDUCED MOTION ---- */
@media (prefers-reduced-motion: reduce) {
  .sun, .bird .plane, .title, .subtitle, .cta, .cta__arrow,
  .collection__item a {
    transition: none !important;
    animation: none !important;
  }
  /* ensure everything is visible immediately, regardless of JS */
  body .sun      { transform: none; opacity: 1; }
  body .title    { transform: scaleY(1.08); opacity: 1; }
  body .subtitle { opacity: 1; }
  body .bird .plane { transform: none; opacity: 1; }
}