:root {
  --page-bg: transparent;
  --surface: #fbfbfb;
  --surface-strong: #ffffff;
  --text: #283444;
  --muted: #4f5e72;
  --heading: #25143e;
  --instruction: #536173;
  --shadow: 0 8px 18px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 12px 24px rgba(0, 0, 0, 0.12);
  --radius-xl: 6px;
  --radius-lg: 4px;
  --content-width: 1660px;
  --sans: Inter, Arial, Helvetica, sans-serif;
  --serif: Georgia, "Times New Roman", serif;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--page-bg);
  color: var(--text);
}

body {
  font-family: var(--sans);
}

.page-shell {
  width: min(var(--content-width), calc(100% - 88px));
  margin: 28px auto 64px;
}

.intro {
  margin-bottom: 34px;
}

.intro h1 {
  margin: 0 0 18px;
  font-family: var(--serif);
  font-size: 32px;
  line-height: 1.18;
  color: var(--heading);
  font-weight: 700;
  letter-spacing: -0.01em;
}

.intro .lede {
  margin: 0 0 18px;
  font-size: 18px;
  line-height: 1.5;
  color: var(--muted);
}

.intro .instruction {
  margin: 0;
  font-size: 16px;
  line-height: 1.5;
  color: var(--instruction);
}

.accordion {
  display: grid;
  gap: 12px;
}

.item-shell {
  background: var(--surface-strong);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 160ms ease, box-shadow 160ms ease;
  padding: 4px;
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.item-shell:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-hover);
}

.item h2 {
  margin: 0;
}

.trigger {
  width: 100%;
  border: 0;
  padding: 0;
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.trigger:focus-visible {
  outline: 4px solid rgba(120, 94, 163, 0.32);
  outline-offset: 4px;
  border-radius: var(--radius-xl);
}

.trigger-bar {
  width: 100%;
  min-height: 58px;
  padding: 14px 22px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  transition: filter 160ms ease, transform 160ms ease;
}

.item-shell:hover .trigger-bar,
.trigger[aria-expanded="true"] .trigger-bar {
  filter: brightness(1.02);
}

.title {
  color: inherit;
  font-size: 20px;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.chev {
  color: inherit;
  font-size: 1.1rem;
  font-weight: 700;
  flex: 0 0 auto;
  transition: transform 160ms ease;
}

.trigger[aria-expanded="true"] .chev {
  transform: rotate(180deg);
}

.panel {
  padding: 12px 6px 2px;
  background: var(--open-content-bg, var(--surface-strong));
}

.panel[hidden] {
  display: none;
}

.hero-image {
  display: block;
  width: 100%;
  max-height: 420px;
  object-fit: cover;
  border-radius: 4px;
  margin: 0 0 22px;
}

.content {
  color: var(--text);
  font-size: 16px;
  line-height: 1.7;
}

.content > :first-child { margin-top: 0; }
.content > :last-child { margin-bottom: 0; }
.content h2,
.content h3,
.content h4 {
  color: var(--heading);
  line-height: 1.25;
}

.content ul,
.content ol {
  padding-left: 1.35rem;
}

.empty-state {
  padding: 32px;
  border-radius: 24px;
  background: var(--surface-strong);
  box-shadow: var(--shadow);
  color: var(--muted);
}

@media (max-width: 900px) {
  .page-shell {
    width: min(calc(100% - 32px), var(--content-width));
    margin-top: 18px;
  }

  .intro h1 {
    font-size: 28px;
  }

  .trigger-bar {
    min-height: 52px;
    padding: 12px 16px;
  }

  .title {
    font-size: 18px;
  }

  .panel {
    padding: 20px 8px 4px;
  }
}
