:root {
  --bg: #16658a;
  --panel: #1e7aa3;
  --accent: #f3e6a6;
  --ink: #12334d;
  --text: #f5f8fa;
  --secondary: #d1e6f0;
  --hairline: rgba(255, 255, 255, 0.16);
  --glow: rgba(115, 184, 214, 0.45);
  --shadow: #0c3a52;
  --display: "Arial Black", Impact, Haettenschweiler, sans-serif;
  --serif: Georgia, "Palatino Linotype", Palatino, serif;
  --sans: ui-sans-serif, system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(ellipse 90% 42% at 50% -8%, var(--glow), transparent 58%),
    var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.05rem;
  line-height: 1.6;
  color-scheme: dark;
}

img,
video {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: var(--accent);
}

a:hover {
  color: white;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.skip {
  position: absolute;
  left: 1rem;
  top: 0;
  transform: translateY(-120%);
  background: var(--accent);
  color: var(--ink);
  padding: 0.5rem 0.8rem;
  border-radius: 8px;
  z-index: 2;
}

.skip:focus {
  transform: none;
}

.wrap {
  width: min(68rem, calc(100% - 2.4rem));
  margin-inline: auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 1;
  background: rgba(22, 101, 138, 0.94);
  border-bottom: 1px solid var(--hairline);
  backdrop-filter: blur(10px);
}

.site-header .wrap,
.site-footer .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 1.5rem;
  padding-block: 0.85rem;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4rem;
  color: var(--text);
  text-decoration: none;
}

.brand-rensha {
  font-family: var(--serif);
  font-size: 1.25rem;
  font-weight: 600;
}

.brand-loop {
  font-family: var(--display);
  font-size: 0.82rem;
  letter-spacing: -0.06em;
  color: var(--accent);
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
}

.nav a {
  color: var(--secondary);
  text-decoration: none;
  font-size: 0.92rem;
}

.nav a:hover {
  color: var(--accent);
}

.title-card {
  position: relative;
  padding: 4.5rem 1.25rem 3.25rem;
  text-align: center;
}

.mark {
  position: absolute;
  width: 18px;
  height: 18px;
  border: 0 solid rgba(255, 255, 255, 0.88);
}

.tl { top: 1.4rem; left: 0; border-top-width: 1.5px; border-left-width: 1.5px; }
.tr { top: 1.4rem; right: 0; border-top-width: 1.5px; border-right-width: 1.5px; }
.bl { bottom: 1.4rem; left: 0; border-bottom-width: 1.5px; border-left-width: 1.5px; }
.br { bottom: 1.4rem; right: 0; border-bottom-width: 1.5px; border-right-width: 1.5px; }

.bug {
  display: inline-block;
  margin: 0 0 1.1rem;
  padding: 0.28rem 0.7rem 0.22rem;
  background: var(--accent);
  color: var(--ink);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

h1.wordmark {
  margin: 0;
  font-family: var(--display);
  font-weight: 900;
  line-height: 0.84;
  letter-spacing: -0.03em;
}

.wordmark .rensha,
.wordmark .loop {
  display: block;
}

.wordmark .rensha {
  font-size: clamp(2.7rem, 10vw, 5.1rem);
  color: var(--text);
  text-shadow:
    -0.025em -0.025em 0 var(--ink),
    0.025em -0.025em 0 var(--ink),
    -0.025em 0.025em 0 var(--ink),
    0.025em 0.025em 0 var(--ink);
}

.wordmark .loop {
  margin-top: 0.06em;
  font-size: clamp(4.4rem, 20vw, 9rem);
  font-style: italic;
  letter-spacing: 0.04em;
  color: var(--accent);
  text-shadow:
    -0.03em -0.03em 0 var(--ink),
    0.03em -0.03em 0 var(--ink),
    -0.03em 0.03em 0 var(--ink),
    0.03em 0.03em 0 var(--ink),
    0 -0.03em 0 var(--ink),
    0 0.03em 0 var(--ink),
    -0.03em 0 0 var(--ink),
    0.03em 0 0 var(--ink),
    0.07em 0.07em 0 var(--shadow);
}

.rule {
  width: 6.5rem;
  height: 4px;
  margin: 1.35rem auto 1.1rem;
  border: 0;
  background: var(--accent);
}

.deck {
  max-width: 28rem;
  margin: 0 auto;
  color: var(--secondary);
  font-size: 1.12rem;
}

.section {
  padding: 1.5rem 0 3rem;
  scroll-margin-top: 4.5rem;
}

.section h2,
.sheet h1 {
  margin: 0.3rem 0 0.8rem;
  font-family: var(--serif);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 600;
  line-height: 1.15;
}

.label {
  margin: 0;
  color: var(--secondary);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.prose {
  max-width: 40rem;
}

.prose p,
.sheet p {
  margin: 0 0 1rem;
}

h3 {
  margin: 1.6rem 0 0.7rem;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
}

.modes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.8rem;
  margin: 0.4rem 0 0;
  padding: 0;
  list-style: none;
}

.modes li,
.panel {
  background: rgba(30, 122, 163, 0.94);
  border: 1px solid var(--hairline);
  border-radius: 22px;
  padding: 1rem 1.05rem 1.05rem;
}

.modes h3 {
  margin: 0.15rem 0 0.35rem;
  font-size: 1.25rem;
}

.modes p,
.films li,
.reels figcaption {
  margin: 0;
  color: var(--secondary);
}

.free {
  display: inline-block;
  margin-bottom: 0.35rem;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.films {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.45rem 1.5rem;
  max-width: 40rem;
  margin: 0.3rem 0 0;
  padding: 0;
  list-style: none;
}

.films strong {
  color: var(--accent);
  font-weight: 700;
}

.note {
  max-width: 40rem;
  margin-top: 1.4rem;
  padding: 0.95rem 1.1rem;
  background: var(--accent);
  color: var(--ink);
  border-radius: 18px;
}

.note p {
  margin: 0;
}

.kanji {
  margin: 0 0 0.7rem;
  padding-top: 1.35rem;
  color: var(--accent);
  font-family: var(--serif);
  font-size: clamp(3.2rem, 10vw, 5rem);
  line-height: 1;
}

.kanji rt {
  font-family: var(--sans);
  font-size: 0.28em;
  letter-spacing: 0.12em;
}

.reels {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
}

.gate {
  position: relative;
  aspect-ratio: 1;
  background: #0e4d6e;
  border-radius: 18px;
  border: 1px solid var(--hairline);
}

.gate .mark {
  width: 16px;
  height: 16px;
}

.gate .tl { top: 10px; left: 10px; }
.gate .tr { top: 10px; right: 10px; }
.gate .bl { bottom: 10px; left: 10px; }
.gate .br { bottom: 10px; right: 10px; }

.slate {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  margin: 0;
  color: var(--accent);
  font-family: var(--display);
  font-size: 1.4rem;
  letter-spacing: 0.08em;
}

.reels figcaption {
  margin-top: 0.7rem;
  font-size: 0.95rem;
}

.sheet {
  width: min(40rem, calc(100% - 2.4rem));
  margin: 2.5rem auto 3rem;
  scroll-margin-top: 4.5rem;
}

.sheet h2 {
  margin: 1.8rem 0 0.55rem;
  font-family: var(--serif);
  font-size: 1.35rem;
  font-weight: 600;
}

.updated {
  color: var(--secondary);
  font-size: 0.92rem;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.92em;
  color: var(--accent);
}

.site-footer {
  border-top: 1px solid var(--hairline);
  color: var(--secondary);
  font-size: 0.92rem;
}

.site-footer p {
  margin: 0;
}

.site-footer nav {
  display: flex;
  gap: 1rem;
}

@media (max-width: 800px) {
  .modes,
  .reels,
  .films {
    grid-template-columns: 1fr;
  }

  .site-header .wrap,
  .site-footer .wrap {
    align-items: flex-start;
    flex-direction: column;
  }

  .title-card {
    padding-top: 3.2rem;
  }
}