:root {
  --ink: #221a37;
  --purple: #2d2345;
  --purple-soft: #665d83;
  --violet: #5a2ee6;
  --violet-hover: #4921c7;
  --pink: #f653a5;
  --paper: #f8f8fc;
  --white: #ffffff;
  --shadow: 0 14px 34px rgba(39, 27, 67, 0.09);
  --radius: 22px;
  --shell: 1320px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  position: relative;
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "DM Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  position: fixed;
  z-index: 20;
  top: -180px;
  left: 50%;
  width: min(1100px, 110vw);
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(246, 83, 165, 0.2) 0%, rgba(90, 46, 230, 0.11) 38%, transparent 70%);
  opacity: 0;
  pointer-events: none;
  transform: translateX(-50%) scale(0.86);
  animation: page-flare 1100ms cubic-bezier(0.22, 0.61, 0.36, 1) 80ms both;
}

main {
  animation: page-arrive 720ms cubic-bezier(0.22, 0.61, 0.36, 1) both;
}

.presenting-card {
  animation: card-arrive 760ms cubic-bezier(0.22, 0.61, 0.36, 1) 130ms both;
}

@keyframes page-flare {
  0% { opacity: 0; transform: translateX(-50%) scale(0.86); }
  38% { opacity: 1; }
  100% { opacity: 0; transform: translateX(-50%) scale(1.08); }
}

@keyframes page-arrive {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: none; }
}

@keyframes card-arrive {
  from { opacity: 0; transform: translateY(14px); }
  to { opacity: 1; transform: none; }
}

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

.shell {
  width: min(calc(100% - 96px), var(--shell));
  margin-inline: auto;
}

.tier { padding: 76px 0 96px; }

.tier--presenting {
  color: var(--white);
  background: var(--purple);
}

.tier--sponsors { padding-bottom: 64px; }
.tier--sponsors + .tier--sponsors { padding-top: 16px; }

.section-heading { max-width: 800px; margin-bottom: 46px; }
.section-heading h1,
.section-heading h2 { margin: 0 0 8px; font-size: clamp(2rem, 4vw, 3rem); line-height: 1.08; letter-spacing: -0.035em; }
.section-heading p { margin: 0; color: var(--purple-soft); font-size: clamp(1rem, 1.6vw, 1.18rem); }
.section-heading--light p { color: rgba(255, 255, 255, 0.72); }

.presenting-grid { display: grid; gap: 28px; }

.presenting-card {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(360px, 1fr);
  min-height: 560px;
  overflow: hidden;
  border-radius: var(--radius);
  background: #f8f6fb;
  color: var(--ink);
}

.presenting-grid[data-count="2"],
.presenting-grid[data-count="3"],
.presenting-grid[data-count="4"] {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.presenting-grid[data-count="2"] .presenting-card,
.presenting-grid[data-count="3"] .presenting-card,
.presenting-grid[data-count="4"] .presenting-card {
  grid-template-columns: 1fr;
}

.presenting-grid[data-count="3"] .presenting-card:first-child { grid-column: 1 / -1; }

.presenting-card__image { min-height: 360px; overflow: hidden; background: #eae6ef; }
.presenting-card__image img { width: 100%; height: 100%; object-fit: cover; }
.presenting-card__content { display: flex; flex-direction: column; padding: clamp(32px, 4vw, 54px); }
.eyebrow { margin: 0 0 22px; color: var(--pink); font-size: 0.78rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; }
.presenting-card__logo { width: auto; max-width: 220px; height: 62px; margin-bottom: 38px; object-fit: contain; object-position: left center; }
.presenting-card h2 { margin: 0; font-size: clamp(1.7rem, 3vw, 2.55rem); line-height: 1.2; letter-spacing: -0.03em; font-weight: 500; }
.presenting-card__actions { margin-top: auto; padding-top: 36px; }
.presenting-card__actions p { margin: 0 0 18px; color: var(--purple-soft); }

.button-row { display: flex; flex-wrap: wrap; gap: 12px; }
.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  border: 2px solid transparent;
  border-radius: 999px;
  font-weight: 700;
  line-height: 1.1;
  text-align: center;
  text-decoration: none;
  transition: transform 160ms ease, background 160ms ease, color 160ms ease, border-color 160ms ease;
}
.button:hover { transform: translateY(-1px); }
.button:focus-visible { outline: 3px solid var(--pink); outline-offset: 3px; }
.button--primary { background: var(--violet); color: var(--white); }
.button--primary:hover { background: var(--violet-hover); }
.button--outline { border-color: #8a80a4; color: var(--purple); }
.button--outline:hover { border-color: var(--purple); background: var(--purple); color: var(--white); }

.foundational-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.sponsor-card {
  display: flex;
  min-height: 330px;
  flex-direction: column;
  align-items: center;
  padding: 34px;
  border-radius: var(--radius);
  background: var(--white);
  box-shadow: var(--shadow);
  text-align: center;
}
.sponsor-card__logo-wrap { display: grid; width: 100%; min-height: 112px; place-items: center; }
.sponsor-card__logo-wrap img { width: auto; max-width: 80%; max-height: 76px; object-fit: contain; }
.sponsor-card > p:not(.eyebrow) { max-width: 330px; margin: 18px auto 28px; color: var(--purple-soft); line-height: 1.35; }
.sponsor-card > .button { margin-top: auto; }
.sponsor-card--inquiry { justify-content: center; background: var(--purple); color: var(--white); }
.sponsor-card--inquiry .eyebrow { margin-bottom: 12px; }
.sponsor-card--inquiry h2 { max-width: 290px; margin: 0; font-size: clamp(1.7rem, 3vw, 2.4rem); line-height: 1.12; }
.sponsor-card--inquiry > p:not(.eyebrow) { margin-block: 20px 26px; color: rgba(255, 255, 255, 0.72); }

.thanks { padding: 52px 0 92px; }
.thanks-card { display: grid; grid-template-columns: minmax(300px, 0.9fr) minmax(420px, 1.1fr); min-height: 540px; overflow: hidden; border-radius: var(--radius); background: var(--pink); color: var(--white); }
.thanks-card__photo { min-height: 480px; background: linear-gradient(90deg, rgba(246, 83, 165, 0) 55%, var(--pink) 100%), url("./assets/erika-lower-block.webp") center center / cover no-repeat; }
.thanks-card__content { align-self: center; max-width: 660px; padding: clamp(38px, 6vw, 76px); }
.thanks-card h2 { margin: 0 0 22px; font-size: clamp(2rem, 4vw, 3.5rem); line-height: 1.05; letter-spacing: -0.04em; }
.thanks-card p { color: rgba(255, 255, 255, 0.9); }
.signature { display: flex; flex-direction: column; margin-top: 28px; }
.signature strong { margin-top: 6px; font-size: 1.1rem; }

@media (max-width: 960px) {
  .presenting-card,
  .presenting-grid[data-count="2"] .presenting-card,
  .presenting-grid[data-count="3"] .presenting-card,
  .presenting-grid[data-count="4"] .presenting-card,
  .thanks-card { grid-template-columns: 1fr; }
  .presenting-grid[data-count="2"],
  .presenting-grid[data-count="3"],
  .presenting-grid[data-count="4"],
  .foundational-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .thanks-card__photo { min-height: 440px; background-image: linear-gradient(180deg, rgba(246, 83, 165, 0) 70%, var(--pink) 100%), url("./assets/erika-lower-block.webp"); }
}

@media (max-width: 640px) {
  .shell { width: min(calc(100% - 56px), var(--shell)); }
  .tier { padding: 54px 0 64px; }
  .section-heading { margin-bottom: 30px; }
  .presenting-grid[data-count="2"],
  .presenting-grid[data-count="3"],
  .presenting-grid[data-count="4"],
  .foundational-grid { grid-template-columns: 1fr; }
  .presenting-grid[data-count="3"] .presenting-card:first-child { grid-column: auto; }
  .presenting-card { min-height: 0; }
  .presenting-card__image { min-height: 260px; }
  .presenting-card__content,
  .sponsor-card { padding: 28px; }
  .presenting-card__logo { margin-bottom: 28px; }
  .button-row { flex-direction: column; }
  .button-row .button { width: 100%; }
  .thanks { padding: 20px 0 64px; }
  .thanks-card__photo { min-height: 360px; }
  .thanks-card__content { padding: 34px 28px 42px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    scroll-behavior: auto !important;
    transition: none !important;
    animation: none !important;
  }
}