:root {
  --ink: #454542;
  --paper: #fafaf8;
  --muted: #6b6b6b;
  --rule: #e0e0dc;
  --serif: "Averia Serif Libre", "Noto Serif JP", "Yu Mincho", "Hiragino Mincho ProN", serif;
  --sans: "Noto Sans", "Hiragino Kaku Gothic ProN", "Yu Gothic", sans-serif;
}

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

html {
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.6;
  letter-spacing: 0.05em;
  display: flex;
}

.sidebar {
  flex: 0 0 22%;
  min-height: 100vh;
  display: flex;
  align-items: stretch;
  border-right: 1px solid var(--rule);
}

#sidebar-graphic {
  width: 100%;
  height: 100%;
  min-height: 100vh;
  color: var(--ink);
}

#sidebar-graphic svg {
  width: 100%;
  height: 100%;
  display: block;
}

#puzzle {
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem 1.5rem;
  max-width: 36rem;
  margin: 0 auto;
  cursor: pointer;
}

.step {
  opacity: 0;
  visibility: hidden;
  transform: translateY(0.5em);
  transition: opacity 0.6s ease, transform 0.6s ease, visibility 0s linear 0.6s;
  margin-bottom: 2.5rem;
}

header.step {
  margin-bottom: 1rem;
}

.step:last-child {
  margin-bottom: 0;
}

#puzzle.reveal-step-0 .step[data-step="0"],
#puzzle.reveal-step-1 .step[data-step="0"],
#puzzle.reveal-step-1 .step[data-step="1"],
#puzzle.reveal-step-2 .step[data-step="0"],
#puzzle.reveal-step-2 .step[data-step="1"],
#puzzle.reveal-step-2 .step[data-step="2"],
#puzzle.reveal-step-3 .step[data-step="0"],
#puzzle.reveal-step-3 .step[data-step="1"],
#puzzle.reveal-step-3 .step[data-step="2"],
#puzzle.reveal-step-3 .step[data-step="3"] {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition-delay: 0s;
}

header {
  text-align: center;
}

.name {
  font-family: var(--serif);
  font-size: clamp(2rem, 5vw, 2.75rem);
  font-weight: 300;
  letter-spacing: 0.02em;
  margin: 0 0 0.5rem;
}

.invite {
  font-size: 0.75rem;
  color: var(--muted);
  letter-spacing: 0.15em;
  text-transform: lowercase;
  margin: 0;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-color: transparent;
  transition: color 0.2s ease, text-decoration-color 0.2s ease;
}

.invite:hover {
  color: var(--ink);
  text-decoration-color: var(--ink);
}

#puzzle.reveal-step-3 .invite {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s ease;
}

.tagline,
.bio {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink);
}

.tagline {
  font-style: italic;
}

.bio {
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
}

a {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: border-color 0.2s ease, color 0.2s ease;
}

a:hover {
  border-bottom-color: var(--ink);
}

.links {
  display: flex;
  gap: 1.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
}

.links a {
  border-bottom: none;
}

.links a:hover {
  color: var(--muted);
}

@media (max-width: 720px) {
  body {
    flex-direction: column;
  }

  #puzzle {
    order: 0;
  }

  .sidebar {
    order: 1;
    flex: 0 0 auto;
    min-height: 35vh;
    border-right: none;
    border-bottom: 1px solid var(--rule);
  }
}

body.error-body {
  justify-content: center;
  align-items: center;
}

body.error-body .sidebar {
  display: none;
}

.error-page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 2rem 1.5rem;
  text-align: center;
}

.error-page .error-title {
  font-family: var(--serif);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 300;
  letter-spacing: 0.02em;
  margin: 0 0 0.5rem;
  color: var(--ink);
}

.error-page .error-message {
  font-size: 0.95rem;
  color: var(--muted);
  margin: 0 0 1.25rem;
  letter-spacing: 0.03em;
}

.error-page a {
  font-size: 0.9rem;
  letter-spacing: 0.05em;
}