:root {
  --bg: #f2f6f4;
  --ink: #0f2438;
  --muted: #304a61;
  --accent: #007f86;
  --panel-bg: rgba(255, 255, 255, 0.72);
  --panel-border: rgba(15, 36, 56, 0.16);
  --ocean: #d6f0f4;
  --coral: #ffe4da;
  --lime: #e8f5db;
}

/* Hide class for JS logic */
.hide {
  display: none;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Segoe UI", "Helvetica Neue", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(
      circle at 10% 10%,
      rgba(0, 127, 134, 0.18),
      transparent 34%
    ),
    radial-gradient(
      circle at 85% 20%,
      rgba(255, 127, 80, 0.15),
      transparent 38%
    ),
    linear-gradient(160deg, #f8faf8, var(--bg));
}

.page-shell {
  width: min(1120px, calc(100% - 2rem));
  margin: 2.25rem auto 3.2rem;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 1.1rem;
}

.hero {
  grid-column: 2 / span 10;
  padding: 1.8rem 1.9rem;
  border-radius: 1.2rem;
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  backdrop-filter: blur(5px);
  box-shadow: 0 20px 35px rgba(15, 36, 56, 0.08);
}

.hero h1 {
  margin: 0.45rem 0 0.45rem;
  font-family: "Iowan Old Style", "Palatino Linotype", serif;
  font-size: clamp(2rem, 4.8vw, 3.25rem);
  line-height: 1.04;
  letter-spacing: -0.012em;
}

.eyebrow {
  margin: 0;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  font-weight: 800;
  color: var(--accent);
  font-size: 0.76rem;
}

.intro {
  margin: 0;
  max-width: 72ch;
  color: var(--muted);
  font-size: 1.03rem;
  line-height: 1.36;
}

.intro + .intro {
  margin-top: 0.55rem;
}

.grid-12 {
  grid-column: 2 / span 10;
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 1.1rem;
  align-items: stretch;
}

.logic-panel {
  border-radius: 1rem;
  border: 1px solid var(--panel-border);
  background: rgba(255, 255, 255, 0.8);
  box-shadow: 0 14px 30px rgba(15, 36, 56, 0.07);
  padding: 1.1rem 1rem 1rem;
}

.panel-kicker {
  margin: 0;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--accent);
  font-size: 0.75rem;
}

.logic-panel h2 {
  margin: 0.45rem 0 0.7rem;
  font-size: 1.12rem;
  line-height: 1.2;
}

.logic-panel ol {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
  line-height: 1.35;
}

.logic-panel li + li {
  margin-top: 0.3rem;
}

.panel-note {
  margin: 0.85rem 0 0;
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.3;
}

.date-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--panel-border);
  background: var(--panel-bg);
  padding: 1.15rem 1.05rem;
  border-radius: 1rem;
  text-align: left;
  box-shadow: 0 16px 28px rgba(15, 36, 56, 0.08);
  min-height: 128px;
  transition:
    transform 0.22s ease,
    box-shadow 0.22s ease;
}

.date-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 36px rgba(15, 36, 56, 0.14);
}

.date-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    145deg,
    rgba(255, 255, 255, 0.38),
    transparent 50%
  );
  pointer-events: none;
}

.date-card > * {
  position: relative;
  z-index: 1;
}

.card-kicker {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.72rem;
  color: rgba(15, 36, 56, 0.66);
  font-weight: 700;
}

.date-card h3 {
  margin: 0.35rem 0 0.42rem;
  font-size: 1.2rem;
  line-height: 1.2;
}

.card-date {
  margin: 0;
  color: rgba(15, 36, 56, 0.82);
  font-size: 0.99rem;
}

.span-3 {
  grid-column: span 3;
}

.span-4 {
  grid-column: span 4;
}

.span-6 {
  grid-column: span 6;
}

.span-8 {
  grid-column: span 8;
}

.span-12 {
  grid-column: span 12;
}

.tone-ocean {
  background: linear-gradient(
    165deg,
    rgba(214, 240, 244, 0.9),
    rgba(255, 255, 255, 0.72)
  );
}

.tone-coral {
  background: linear-gradient(
    165deg,
    rgba(255, 228, 218, 0.92),
    rgba(255, 255, 255, 0.74)
  );
}

.tone-lime {
  background: linear-gradient(
    165deg,
    rgba(232, 245, 219, 0.92),
    rgba(255, 255, 255, 0.74)
  );
}

@media (max-width: 900px) {
  .hero,
  .grid-12 {
    grid-column: 1 / -1;
  }

  .logic-panel {
    grid-column: span 12;
  }

  .span-3,
  .span-4,
  .span-6,
  .span-8 {
    grid-column: span 6;
  }
}

@media (max-width: 640px) {
  .page-shell {
    width: min(1120px, calc(100% - 1.2rem));
    margin-top: 1rem;
  }

  .hero {
    padding: 1.2rem 1rem;
  }

  .grid-12 {
    gap: 0.75rem;
  }

  .date-card {
    min-height: 120px;
  }

  .span-3,
  .span-4,
  .span-6,
  .span-8 {
    grid-column: span 12;
  }
}