/* GuildeHall - 37signals-inspired accordion design */

:root {
  --color-text: #fffafa;
  --color-bg: #c04657;
  --color-text-muted: rgba(255, 250, 250, 0.4375);
  --font-size: calc(1.25em + 1vw);
  --line-height: 1.3em;
  --spacing: 0.75em;
  --transition: 0.2s ease;
  --letter-spacing: -0.01em;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  height: 100%;
}

body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  font-family: 'nimbus-sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  font-size: var(--font-size);
  line-height: var(--line-height);
  letter-spacing: var(--letter-spacing);
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Header with logo */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  justify-content: flex-end;
  align-items: center;
  padding: calc(var(--spacing) * 1.5) calc(var(--spacing) * 2);
  pointer-events: none;
}

.logo {
  pointer-events: auto;
  color: #ffffff;
  text-decoration: none;
  transition: opacity var(--transition);
}

.logo:hover {
  opacity: 0.7;
}

.logo svg {
  height: 1.05em;
  width: auto;
  display: block;
}

/* Main content area */
.signals {
  padding: calc(var(--spacing) * 6) calc(var(--spacing) * 1.5) calc(var(--spacing) * 6);
  max-width: 100%;
  min-height: 100vh;
}

/* Individual sections - accordion style */
.signal {
  position: relative;
}

/* Section header (clickable link) */
.signal__header {
  display: block;
  text-decoration: none;
  color: inherit;
  cursor: pointer;
}

.signal__header h2 {
  font-size: 1em;
  font-weight: bold;
  line-height: var(--line-height);
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0 0.3em;
  transition: opacity var(--transition);
}

.signal__header h2 span {
  font-weight: bold;
  color: var(--color-text-muted);
  transition: opacity var(--transition);
}

.signal__header h2 strong {
  font-weight: bold;
  transition: opacity var(--transition);
}

/* Active section - full opacity for number and show title */
.signal.active .signal__header h2 span {
  opacity: 1 !important;
  color: var(--color-text);
}

.signal.active .signal__header h2 strong {
  opacity: 1;
}

/* Hover on inactive sections - show title at full opacity */
.signal:not(.active):hover .signal__header h2 span,
.signal:not(.active):hover .signal__header h2 strong {
  opacity: 1 !important;
}

/* Content area - hidden by default */
.signal__content {
  margin-left: 2.8ch;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.3s ease, opacity 0.3s ease, margin 0.3s ease;
}

/* Active section - show content */
.signal.active .signal__content {
  max-height: 2000px;
  opacity: 1;
  margin-top: 0.25em;
  margin-bottom: 1em;
}

.signal__content p {
  font-size: 0.85em;
  font-weight: 300;
  line-height: var(--line-height);
  margin: 0 0 0.75em 0;
}

.signal__content p:last-child {
  margin-bottom: 0;
}

/* Links in content */
.signal__content a {
  color: var(--color-text);
  text-decoration: underline;
  text-underline-offset: 0.15em;
  transition: opacity var(--transition);
}

.signal__content a:hover {
  opacity: 0.7;
}

/* Lists */
.signal__content ul {
  margin: 0 0 0.75em 0;
  padding-left: 1.5em;
  list-style-type: disc;
}

.signal__content ul li {
  font-size: 0.85em;
  font-weight: 300;
  margin-bottom: 0.25em;
  line-height: var(--line-height);
}

.signal__content ul li:last-child {
  margin-bottom: 0;
}

/* Subheadings in section 08 */
.signal__content h3 {
  font-size: 0.85em;
  font-weight: 300;
  font-style: italic;
  line-height: var(--line-height);
  margin: 1.5em 0 0.25em 0;
}

.signal__content h3:first-child {
  margin-top: 0;
}

/* Circular navigation button */
.nav-next {
  position: fixed;
  bottom: calc(var(--spacing) * 2);
  right: calc(var(--spacing) * 2);
  z-index: 100;
}

.nav-next button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: calc((var(--line-height) + var(--spacing)) * 2);
  height: calc((var(--line-height) + var(--spacing)) * 2);
  border: none;
  border-radius: 100%;
  background-color: var(--color-text);
  color: var(--color-bg);
  cursor: pointer;
  transition: transform var(--transition), opacity var(--transition), box-shadow var(--transition);
  box-shadow: 0 0 1em 0.1em rgba(192, 70, 87, 0.4);
}

.nav-next button:hover {
  transform: scale(1.05);
  box-shadow: 0 0 1.3em 0.2em rgba(192, 70, 87, 0.5);
}

.nav-next button:active {
  transform: scale(0.98);
}

.nav-next button svg {
  width: 50%;
  height: 50%;
}

/* Hide button when at the last section */
.nav-next.hidden {
  opacity: 0;
  pointer-events: none;
}

/* Responsive adjustments */
@media (max-width: 768px) {
  :root {
    --font-size: calc(1em + 1vw);
  }

  .signals {
    padding: calc(var(--spacing) * 4) var(--spacing) calc(var(--spacing) * 4);
  }

  .signal__content {
    margin-left: 0;
  }

  .signal.active .signal__content {
    margin-top: 0.5em;
  }

  .signal__header h2 {
    flex-direction: column;
    gap: 0;
  }
}

@media (min-width: 1200px) {
  :root {
    --font-size: calc(1.25em + 0.5vw);
  }

  .signals {
    max-width: 1100px;
    margin: 0 auto;
  }
}

/* Print styles */
@media print {
  .header,
  .nav-next {
    display: none;
  }

  .signals {
    padding: 0;
  }

  .signal__content {
    max-height: none;
    opacity: 1;
  }

  .signal__header h2 strong {
    opacity: 1;
  }
}