:root {
  --sakura-white: #fff8f6;
  --sakura-pale: #f9e3e3;
  --sakura-soft: #efc5c8;
  --sakura-pink: #d9989f;
  --sakura-red: #a94650;
  --sakura-deep: #6d2730;
  --obi-red: #7d202c;
  --ink: #3b2529;
  --muted-ink: #71575c;
  --gold: #c7a86a;
  --paper: rgba(255, 250, 247, 0.92);
  --shadow: rgba(82, 30, 40, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  position: relative;
  margin: 0;
  min-height: 100vh;
  overflow-x: hidden;

  color: var(--ink);

  font-family:
    "Yu Mincho",
    "Hiragino Mincho ProN",
    "Noto Serif JP",
    Georgia,
    serif;

  background:
    radial-gradient(
      circle at 12% 8%,
      rgba(255, 255, 255, 0.98) 0 4%,
      transparent 16%
    ),
    radial-gradient(
      circle at 88% 20%,
      rgba(239, 197, 200, 0.5) 0 5%,
      transparent 18%
    ),
    radial-gradient(
      circle at 50% 100%,
      rgba(255, 248, 246, 0.75) 0 12%,
      transparent 34%
    ),
    linear-gradient(
      145deg,
      #fffaf8 0%,
      #f8e7e7 44%,
      #efd0d3 100%
    );

  background-attachment: fixed;
}

/*
   Falling sakura flowers.
   Requires sakura_flower.svg to be in the same folder as kyuka.css.
*/

.sakura-fall {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}

.sakura-fall span {
  position: absolute;
  top: -18vh;
  left: var(--x);

  width: var(--size);
  height: var(--size);

  background-image: url("sakura_flower.svg");
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;

  opacity: var(--opacity);

  transform-origin: 50% 50%;
  animation: sakura-spiral var(--duration) linear infinite;
  animation-delay: var(--delay);

  will-change: transform;
}

/* Larger, sparse falling flowers */

.sakura-fall span:nth-child(1) {
  --x: 3vw;
  --size: 96px;
  --opacity: 0.34;
  --duration: 24s;
  --delay: -4s;
  --drift-a: 80px;
  --drift-b: -50px;
  --drift-c: 110px;
  --drift-d: -70px;
}

.sakura-fall span:nth-child(2) {
  --x: 14vw;
  --size: 72px;
  --opacity: 0.28;
  --duration: 31s;
  --delay: -18s;
  --drift-a: -70px;
  --drift-b: 65px;
  --drift-c: -95px;
  --drift-d: 45px;
}

.sakura-fall span:nth-child(3) {
  --x: 25vw;
  --size: 118px;
  --opacity: 0.26;
  --duration: 38s;
  --delay: -11s;
  --drift-a: 90px;
  --drift-b: -80px;
  --drift-c: 120px;
  --drift-d: -40px;
}

.sakura-fall span:nth-child(4) {
  --x: 37vw;
  --size: 84px;
  --opacity: 0.3;
  --duration: 27s;
  --delay: -24s;
  --drift-a: -60px;
  --drift-b: 90px;
  --drift-c: -75px;
  --drift-d: 80px;
}

.sakura-fall span:nth-child(5) {
  --x: 48vw;
  --size: 132px;
  --opacity: 0.22;
  --duration: 44s;
  --delay: -30s;
  --drift-a: 100px;
  --drift-b: -100px;
  --drift-c: 75px;
  --drift-d: -85px;
}

.sakura-fall span:nth-child(6) {
  --x: 58vw;
  --size: 76px;
  --opacity: 0.32;
  --duration: 29s;
  --delay: -8s;
  --drift-a: -90px;
  --drift-b: 60px;
  --drift-c: -120px;
  --drift-d: 70px;
}

.sakura-fall span:nth-child(7) {
  --x: 68vw;
  --size: 108px;
  --opacity: 0.25;
  --duration: 36s;
  --delay: -20s;
  --drift-a: 60px;
  --drift-b: -70px;
  --drift-c: 105px;
  --drift-d: -65px;
}

.sakura-fall span:nth-child(8) {
  --x: 78vw;
  --size: 88px;
  --opacity: 0.3;
  --duration: 33s;
  --delay: -14s;
  --drift-a: -80px;
  --drift-b: 100px;
  --drift-c: -60px;
  --drift-d: 90px;
}

.sakura-fall span:nth-child(9) {
  --x: 88vw;
  --size: 124px;
  --opacity: 0.21;
  --duration: 47s;
  --delay: -33s;
  --drift-a: 110px;
  --drift-b: -85px;
  --drift-c: 95px;
  --drift-d: -110px;
}

.sakura-fall span:nth-child(10) {
  --x: 96vw;
  --size: 78px;
  --opacity: 0.28;
  --duration: 26s;
  --delay: -7s;
  --drift-a: -100px;
  --drift-b: 75px;
  --drift-c: -95px;
  --drift-d: 60px;
}

.sakura-fall span:nth-child(11) {
  --x: 44vw;
  --size: 92px;
  --opacity: 0.24;
  --duration: 41s;
  --delay: -36s;
  --drift-a: -75px;
  --drift-b: 105px;
  --drift-c: -110px;
  --drift-d: 70px;
}

.sakura-fall span:nth-child(12) {
  --x: 8vw;
  --size: 136px;
  --opacity: 0.19;
  --duration: 53s;
  --delay: -43s;
  --drift-a: 120px;
  --drift-b: -110px;
  --drift-c: 85px;
  --drift-d: -95px;
}

@keyframes sakura-spiral {
  0% {
    transform:
      translate3d(0, -22vh, 0)
      rotate(0deg);
  }

  20% {
    transform:
      translate3d(var(--drift-a), 10vh, 0)
      rotate(95deg);
  }

  40% {
    transform:
      translate3d(var(--drift-b), 38vh, 0)
      rotate(190deg);
  }

  60% {
    transform:
      translate3d(var(--drift-c), 66vh, 0)
      rotate(285deg);
  }

  80% {
    transform:
      translate3d(var(--drift-d), 94vh, 0)
      rotate(380deg);
  }

  100% {
    transform:
      translate3d(0, 128vh, 0)
      rotate(480deg);
  }
}

main {
  position: relative;
  z-index: 1;

  width: min(1450px, 100%);
  margin: 0 auto;
  padding: 0 28px 70px;
}

.page-header {
  position: relative;
}

h1 {
  position: relative;
  margin: 0;
  padding-top: 54px;

  color: var(--sakura-deep);
  text-align: center;

  font-size: clamp(48px, 8vw, 82px);
  font-weight: 500;
  letter-spacing: 0.12em;

  text-shadow: 0 2px 0 rgba(255, 255, 255, 0.8);
}

h1::before {
  content: none;
}

h1::after {
  content: "";
  display: block;

  width: min(360px, 70vw);
  height: 2px;
  margin: 18px auto 0;

  background:
    linear-gradient(
      90deg,
      transparent,
      var(--gold),
      var(--sakura-red),
      var(--gold),
      transparent
    );
}

/* Shared text-box styling */

.description,
.art-note {
  color: var(--muted-ink);
  text-align: center;

  background: var(--paper);

  border: 1px solid rgba(169, 70, 80, 0.18);
  border-top: 4px solid var(--sakura-red);
  border-radius: 3px 3px 14px 14px;

  box-shadow:
    0 12px 30px var(--shadow),
    inset 0 0 0 1px rgba(255, 255, 255, 0.72);
}

.description {
  max-width: 780px;
  margin: 28px auto 38px;
  padding: 24px 30px;

  font-size: 18px;
  line-height: 1.75;
}

.art-note {
  max-width: 760px;
  margin: 0 auto 34px;
  padding: 18px 24px;

  font-size: 16px;
  line-height: 1.65;
}

/* Kimono-pattern divider */

.kimono-divider {
  width: min(520px, 72vw);
  height: 14px;
  margin: 0 auto 46px;

  background:
    repeating-linear-gradient(
      90deg,
      rgba(169, 70, 80, 0.34) 0 16px,
      transparent 16px 26px,
      rgba(199, 168, 106, 0.36) 26px 28px,
      transparent 28px 40px
    );

  border-radius: 999px;
  opacity: 0.65;
}

/* Gallery */

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 34px 28px;
  align-items: start;
}

.gallery-item {
  position: relative;
  margin: 0;
  padding: 10px;
  overflow: hidden;

  background: rgba(255, 252, 249, 0.94);

  border: 1px solid rgba(125, 32, 44, 0.19);
  border-radius: 4px;

  box-shadow:
    0 10px 24px rgba(82, 30, 40, 0.14),
    0 2px 4px rgba(82, 30, 40, 0.08);

  transition:
    transform 0.28s ease,
    box-shadow 0.28s ease,
    border-color 0.28s ease;
}

.gallery-item::before {
  content: "";
  position: absolute;
  inset: 4px;
  z-index: 1;

  border: 1px solid rgba(199, 168, 106, 0.52);

  pointer-events: none;
}

.gallery-item::after {
  content: none;
}

.gallery-item:hover {
  transform: translateY(-3px);
  border-color: rgba(125, 32, 44, 0.36);

  box-shadow:
    0 14px 30px rgba(82, 30, 40, 0.18),
    0 3px 7px rgba(82, 30, 40, 0.1);
}

.gallery a {
  display: flex;
  align-items: center;
  justify-content: center;

  color: inherit;
  text-decoration: none;
}

/*
   No cropping.
   Images scale down to fit their card and the screen,
   but retain their original proportions.
*/

.gallery img {
  display: block;

  width: auto;
  max-width: 100%;

  height: auto;
  max-height: 72vh;

  filter:
    saturate(0.94)
    contrast(0.98)
    brightness(1.02);

  transition:
    transform 0.4s ease,
    filter 0.4s ease;
}

.gallery-item:hover img {
  transform: scale(1.012);

  filter:
    saturate(1.01)
    contrast(1)
    brightness(1.02);
}

::selection {
  color: #fff;
  background: var(--sakura-red);
}

/* Mobile layout */

@media (max-width: 720px) {
  main {
    padding-inline: 15px;
  }

  h1 {
    padding-top: 36px;
    letter-spacing: 0.08em;
  }

  .description {
    margin-bottom: 26px;
    padding: 20px;

    font-size: 16px;
    line-height: 1.65;
  }

  .art-note {
    margin-bottom: 28px;
    padding: 16px 18px;

    font-size: 15px;
    line-height: 1.6;
  }

  .kimono-divider {
    width: min(420px, 78vw);
    height: 12px;
    margin-bottom: 34px;
  }

  .gallery {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 14px;
  }

  .gallery-item {
    padding: 6px;
  }

  .gallery img {
    max-height: 55vh;
  }

  .sakura-fall span {
    width: calc(var(--size) * 0.72);
    height: calc(var(--size) * 0.72);
  }
}

@media (max-width: 430px) {
  .gallery {
    grid-template-columns: 1fr;
  }

  .gallery img {
    max-height: 70vh;
  }
}

/* Reduced motion */

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

  .sakura-fall span {
    animation: none;
  }

  .gallery-item,
  .gallery img {
    transition: none;
  }

  .gallery-item:hover,
  .gallery-item:hover img {
    transform: none;
  }
}