:root {
  --bg: #fffaf7;
  --ink: #e6dfe0;
  --text: #060606;
  --muted: #2d2d2d;
  --red: #ff8aa1;
  --blue: #7bb6ff;
  --yellow: #ffe08c;
  --green: #9ad8a5;
  --accent: #ff6fa3;
  --focus: #5aa9ff;
  --radius: 18px;
}

/* base */
* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  font: 16px/1.6 ui-serif, "Iowan Old Style", "Apple Garamond", Baskerville,
    "Times New Roman", Times, Georgia, "Noto Serif", "Droid Serif",
    "Source Serif Pro", serif;
  color: var(--text);
  background: var(--bg);
  background-image: radial-gradient(
      circle at 1px 1px,
      rgba(0, 0, 0, 0.035) 1px,
      transparent 2px
    ),
    radial-gradient(circle at 1px 1px, rgba(0, 0, 0, 0.02) 1px, transparent 2px),
    repeating-radial-gradient(
      circle at 0 0,
      rgba(0, 0, 0, 0.015) 0 1px,
      transparent 2px 6px
    );
  background-size: 24px 24px, 12px 12px, 160px 160px;
}
a {
  color: inherit;
  text-decoration: none;
}
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 24px;
}
.section {
  padding: 56px 24px;
}
.section h2 {
  font-size: clamp(1.6rem, 2vw+0.5rem, 2.2rem);
  margin: 0 0 10px;
}

/* also want a h2 where it's centered and the p child below is also centered */
.section.centered {
  text-align: center;
}

.lead {
  color: var(--muted);
  margin: 0 0 20px;
}
.section ul {
  color: var(--muted);
  padding-left: 1.2rem;
  margin: 10px 0 0;
}
.section li {
  margin: 6px 0;
}

/* header */
header {
  position: sticky;
  top: 0;
  z-index: 1000;
  backdrop-filter: blur(6px);
  background: linear-gradient(
    to bottom,
    rgba(255, 255, 255, 0.92),
    rgba(255, 255, 255, 0.7)
  );
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
nav ul {
  display: flex;
  gap: 14px;
  padding: 0;
  margin: 0;
  list-style: none;
}
nav a {
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 10px;
  color: var(--muted);
  letter-spacing: 0.1px;
}
nav a:hover,
nav a:focus {
  color: #111;
  background: rgba(0, 0, 0, 0.06);
  outline: 0;
}

/* hero */
.hero {
  position: relative;
  padding: 80px 24px 40px;
  overflow: hidden;
}
.hero .container {
  position: relative;
  z-index: 3;
}
.headline {
  font-weight: 900;
  letter-spacing: 0.3px;
  margin: 12px 0;
  line-height: 1.15;
  font-size: clamp(2rem, 4vw+0.5rem, 3.6rem);
}
.subhead {
  color: var(--muted);
  max-width: 720px;
  margin: 0 0 24px;
}

/* buttons */
.cta-row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 18px;
  border: 0;
  border-radius: 14px;
  font-weight: 700;
  box-shadow: 0 8px 0 rgba(0, 0, 0, 0.08);
  transition: transform 0.06s, box-shadow 0.2s;
}
.btn:focus {
  outline: 3px solid var(--focus);
  outline-offset: 2px;
}
.btn:hover {
  transform: translateY(-2px);
}
.btn:active {
  transform: translateY(2px);
  box-shadow: 0 4px 0 rgba(0, 0, 0, 0.08);
}
.btn.primary {
  background: var(--accent);
  color: #2b2b2b;
}
.btn.secondary {
  background: #fff;
  color: #2b2b2b;
  border: 2px solid rgba(0, 0, 0, 0.08);
}

/* hero bricks */
.brick-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.32;
  z-index: 0;
}
.brick-grid .layer {
  position: absolute;
  width: 120%;
  left: -10%;
}
.brick-grid .layer:nth-child(1) {
  top: -20px;
  transform: rotate(-2deg);
}
.brick-grid .layer:nth-child(2) {
  top: 140px;
  transform: rotate(1deg);
}
.brick-grid .layer:nth-child(3) {
  top: 300px;
  transform: rotate(-1deg);
}
.brick-row {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 12px;
  padding: 0 24px;
  margin: 14px 0;
}
.brick {
  position: relative;
  height: 58px;
  border-radius: 10px;
  filter: drop-shadow(0 6px 0 rgba(0, 0, 0, 0.08));
}
.brick.red {
  background: #ffd0da;
}
.brick.blue {
  background: #cfe3ff;
}
.brick.yellow {
  background: #fff0bf;
  color: #1a1a1a;
}
.brick.green {
  background: #d5f3db;
}
.brick:before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  opacity: 0.65;
  background-image: radial-gradient(
    circle at 10px 10px,
    rgba(255, 255, 255, 0.95) 0 6px,
    transparent 7px
  );
  background-size: 28px 28px;
  background-position: 4px 4px;
  mix-blend-mode: screen;
}

/* sakura petals */
.emoji-sakura {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 2;
}
.emoji-sakura span {
  position: absolute;
  top: -10vh;
  font-size: 20px;
  filter: drop-shadow(0 2px 1px rgba(0, 0, 0, 0.25));
  animation: petal-fall var(--dur, 14s) linear infinite;
  animation-delay: var(--delay, 0s);
}
.emoji-sakura span:nth-child(1) {
  left: 5%;
  --delay: -1s;
  --dur: 12s;
}
.emoji-sakura span:nth-child(2) {
  left: 12%;
  --delay: -3s;
  --dur: 16s;
}
.emoji-sakura span:nth-child(3) {
  left: 20%;
  --delay: -5s;
  --dur: 13s;
}
.emoji-sakura span:nth-child(4) {
  left: 28%;
  --delay: -7s;
  --dur: 17s;
}
.emoji-sakura span:nth-child(5) {
  left: 36%;
  --delay: -9s;
  --dur: 15s;
}
.emoji-sakura span:nth-child(6) {
  left: 48%;
  --delay: -2s;
  --dur: 18s;
}
.emoji-sakura span:nth-child(7) {
  left: 58%;
  --delay: -4s;
  --dur: 14s;
}
.emoji-sakura span:nth-child(8) {
  left: 66%;
  --delay: -6s;
  --dur: 19s;
}
.emoji-sakura span:nth-child(9) {
  left: 74%;
  --delay: -8s;
  --dur: 16s;
}
.emoji-sakura span:nth-child(10) {
  left: 82%;
  --delay: -10s;
  --dur: 20s;
}
.emoji-sakura span:nth-child(11) {
  left: 88%;
  --delay: -11s;
  --dur: 18s;
}
.emoji-sakura span:nth-child(12) {
  left: 94%;
  --delay: -12s;
  --dur: 21s;
}
@keyframes petal-fall {
  from {
    transform: translateY(-10vh) rotate(0);
  }
  to {
    transform: translateY(110vh) rotate(360deg);
  }
}

/* grid helpers */
.cards,
.mosaic {
  display: grid;
  gap: 18px;
}
.cards {
  grid-template-columns: repeat(12, 1fr);
}
.card {
  grid-column: span 12;
  background: linear-gradient(180deg, #fff 0%, #fff4f7 100%);
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.08);
}
@media (min-width: 720px) {
  .card {
    grid-column: span 6;
  }
}
@media (min-width: 1024px) {
  .card {
    grid-column: span 4;
  }
}
.card.full {
  grid-column: span 12 !important;
}
.card.half {
  grid-column: span 12;
}
@media (min-width: 720px) {
  .card.half {
    grid-column: span 6 !important;
  }
}
.card.third {
  @media (min-width: 1024px) {
    grid-column: span 4 !important;
  }
}
.card-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 10px;
}
.stud {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 2px solid rgba(0, 0, 0, 0.12);
  box-shadow: inset 0 3px 0 rgba(0, 0, 0, 0.08),
    inset 0 -3px 0 rgba(255, 255, 255, 0.5);
}
.stud.red {
  background: var(--red);
}
.stud.blue {
  background: var(--blue);
}
.stud.yellow {
  background: var(--yellow);
}
.stud.green {
  background: var(--green);
}
.card p {
  color: var(--muted);
  margin: 0;
}

/* submissions (brick tiles + caption) */
.mosaic {
  grid-template-columns: repeat(8, 1fr);
  gap: 10px;
  margin-top: 14px;
}
.submission {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.tile {
  position: relative;
  display: block;
  aspect-ratio: 1.5/1;
  border-radius: 12px;
  overflow: hidden;
  background: #fff;
  border: 1px solid rgba(0, 0, 0, 0.06);
  text-decoration: none;
  color: inherit;
}

.tile .studs {
  position: absolute;
  inset: 0;
  opacity: 0.5;
  background-image: radial-gradient(
    circle at 8px 8px,
    rgba(0, 0, 0, 0.08) 0 5px,
    transparent 6px
  );
  background-size: 22px 22px;
  background-position: 2px 2px;
  mix-blend-mode: multiply;
}
.tile.one {
  grid-column: span 4;
  background: linear-gradient(135deg, #ffd9e6, #ffc1d6);
}
.tile.two {
  grid-column: span 2;
  background: linear-gradient(135deg, #d6e7ff, #bcd9ff);
}
.tile.three {
  grid-column: span 2;
  background: linear-gradient(135deg, #fff1bd, #ffe8a6);
}
.tile.four {
  grid-column: span 3;
  background: linear-gradient(135deg, #d7f5dc, #c0f0ca);
}
.tile.five {
  grid-column: span 5;
  background: linear-gradient(135deg, #e9deff, #d7cbff);
}
.tile-label {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  font-weight: 700;
  text-align: center;
  color: #2b2b2b;
}
.authors {
  margin-top: 6px;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
}
.authors a {
  color: inherit;
  text-decoration: underline;
}

/* sponsors */
.sponsor-grid {
  /* display: grid; */
  gap: 14px;
  justify-items: center;
  margin-top: 10px;
  /* grid-template-columns: repeat(2, 1fr); */
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}
.sponsor {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 92px;
  padding: 12px 16px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, #fff 0%, #fff7fa 100%);
  border: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.06);
  text-decoration: none;
}
.sponsor img {
  max-height: 56px;
  max-width: 100%;
  object-fit: contain;
  filter: opacity(0.9);
  transition: transform 0.08s, filter 0.14s;
}
.sponsor:hover img,
.sponsor:focus img {
  transform: translateY(-2px);
  filter: none;
}

/* footer */
footer {
  padding: 28px 24px;
  color: var(--muted);
  border-top: 1px solid rgba(0, 0, 0, 0.06);
}
.foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.legal {
  font-size: 0.9rem;
}
.pill {
  padding: 6px 10px;
  border-radius: 10px;
  background: rgba(0, 0, 0, 0.04);
  border: 1px solid rgba(0, 0, 0, 0.08);
}