:root {
  --color-base: #fff0eb;
  --color-main: #333333;
  --color-accent: #ec008c;
  --color-cyan: #00ced1;
  --color-yellow: #d4a400;
  --color-white: #ffffff;
  --color-border: rgba(51, 51, 51, 0.12);
  --color-muted: #777777;
  --shadow-soft: 0 18px 60px rgba(51, 51, 51, 0.08);
  --shadow-card: 0 10px 32px rgba(51, 51, 51, 0.08);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans JP", sans-serif;
  color: var(--color-main);
  background:
    radial-gradient(circle at top left, rgba(236, 0, 140, 0.06), transparent 30%),
    linear-gradient(180deg, #fff7f4 0%, var(--color-base) 52%, #fffaf8 100%);
  line-height: 1.7;
}

a {
  color: inherit;
}

.page-shell {
  width: min(1240px, calc(100% - 48px));
  margin: 0 auto;
  padding: 24px 0 80px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 16px 0 20px;
  backdrop-filter: blur(14px);
}

.topbar-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.topbar-external {
  display: flex;
  align-items: center;
  gap: 18px;
}

.topbar-external a {
  font-size: 13px;
  font-weight: 700;
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.18s ease;
}

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

.chip-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: rgba(255, 255, 255, 0.82);
  text-decoration: none;
  font-size: 14px;
  font-weight: 700;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.chip-link:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-card);
  border-color: rgba(236, 0, 140, 0.25);
}

.chip-link.is-primary {
  background: var(--color-accent);
  color: var(--color-white);
  border-color: transparent;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  gap: 24px;
  align-items: stretch;
  margin-top: 12px;
}

.hero-card,
.panel,
.content-card,
.prompt-card,
.sheet-card {
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--color-border);
  border-radius: 28px;
  box-shadow: var(--shadow-soft);
}

.hero-card {
  padding: 44px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(236, 0, 140, 0.1);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 700;
}

.hero h1 {
  margin: 20px 0 16px;
  font-family: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.hero p {
  margin: 0;
  font-size: 18px;
  color: var(--color-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.hero-side {
  display: grid;
  gap: 18px;
}

.panel {
  padding: 26px;
}

.panel h2 {
  margin: 0 0 10px;
  font-size: 20px;
}

.panel p,
.panel li {
  margin: 0;
  font-size: 15px;
  color: var(--color-muted);
}

.panel ul {
  padding-left: 18px;
  margin: 0;
}

.section {
  margin-top: 44px;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 18px;
}

.section-title h2 {
  margin: 0;
  font-family: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 1.15;
}

.section-title p {
  margin: 0;
  font-size: 15px;
  color: var(--color-muted);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.content-card {
  padding: 26px;
}

.content-card h3 {
  margin: 0 0 8px;
  font-family: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
  font-size: 24px;
  line-height: 1.2;
}

.content-card p {
  margin: 0 0 18px;
  color: var(--color-muted);
}

.content-card ul {
  padding-left: 18px;
  margin: 0 0 22px;
}

.content-card li {
  margin-bottom: 6px;
}

.content-card .card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}

.mini-tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(0, 206, 209, 0.12);
  color: #007f82;
  font-size: 12px;
  font-weight: 700;
}

.accent-line {
  height: 4px;
  width: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--color-accent), rgba(236, 0, 140, 0.12));
  margin-bottom: 18px;
}

.detail-hero {
  padding: 34px 38px;
  margin-top: 8px;
}

.detail-hero h1 {
  margin: 16px 0 10px;
  font-family: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
  font-size: clamp(32px, 5vw, 54px);
  line-height: 1.12;
}

.detail-hero p {
  margin: 0;
  color: var(--color-muted);
}

.detail-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.detail-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(280px, 0.45fr);
  gap: 20px;
  align-items: start;
  margin-top: 28px;
}

.prompt-list,
.sheet-list {
  display: grid;
  gap: 16px;
}

.prompt-card,
.sheet-card {
  padding: 24px;
}

.prompt-card h2,
.sheet-card h2 {
  margin: 0 0 8px;
  font-family: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
  font-size: 28px;
  line-height: 1.18;
}

.prompt-card p,
.sheet-card p,
.sheet-card li {
  color: var(--color-muted);
}

.scene {
  margin: 10px 0 14px;
  font-size: 14px;
}

.scene strong {
  color: var(--color-main);
}

.code-wrap {
  position: relative;
}

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  z-index: 1;
  padding: 6px 14px;
  border: none;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.15);
  color: rgba(255, 255, 255, 0.7);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease;
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.25);
  color: #fff;
}

pre {
  overflow-x: auto;
  padding: 18px 20px;
  border-radius: 18px;
  background: #231f20;
  color: #fff8fc;
  font-size: 14px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}

code {
  font-family: "SFMono-Regular", "Menlo", "Monaco", monospace;
}

.sidebar-stack {
  display: grid;
  gap: 16px;
  position: sticky;
  top: 92px;
}

.sidebar-stack .panel {
  padding: 22px;
}

.sidebar-stack h3 {
  margin: 0 0 10px;
  font-size: 18px;
}

.sidebar-stack ol,
.sidebar-stack ul {
  margin: 0;
  padding-left: 18px;
}

.sidebar-stack li {
  margin-bottom: 8px;
  font-size: 14px;
  color: var(--color-muted);
}

.check-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.check-card {
  padding: 22px;
}

.check-card h2 {
  margin: 0 0 12px;
  font-family: "Zen Kaku Gothic New", "Noto Sans JP", sans-serif;
  font-size: 28px;
  line-height: 1.18;
}

.check-card ul {
  margin: 0;
  padding-left: 18px;
}

.check-card li {
  margin-bottom: 8px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(255, 255, 255, 0.65);
  border-radius: 18px;
  overflow: hidden;
}

th,
td {
  padding: 14px 16px;
  border-bottom: 1px solid rgba(51, 51, 51, 0.08);
  text-align: left;
  vertical-align: top;
  font-size: 15px;
}

th {
  background: rgba(236, 0, 140, 0.08);
  font-weight: 700;
}

.sheet-step {
  counter-increment: step;
}

.sheet-step::before {
  content: counter(step);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: 14px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-white);
  font-weight: 700;
}

.sheet-steps {
  counter-reset: step;
  display: grid;
  gap: 16px;
}

.callout {
  padding: 22px;
  border-radius: 24px;
  background: linear-gradient(135deg, rgba(236, 0, 140, 0.12), rgba(0, 206, 209, 0.08));
  border: 1px solid rgba(236, 0, 140, 0.14);
}

.callout h2 {
  margin: 0 0 10px;
}

.footer-note {
  margin-top: 40px;
  text-align: center;
  color: var(--color-muted);
  font-size: 14px;
}

@media (max-width: 1040px) {
  .hero,
  .detail-grid,
  .card-grid,
  .check-grid {
    grid-template-columns: 1fr;
  }

  .sidebar-stack {
    position: static;
  }
}

/* Hamburger button */
.hamburger {
  display: none;
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 100;
  width: 56px;
  height: 56px;
  border: none;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 6px 24px rgba(236, 0, 140, 0.35);
  cursor: pointer;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  transition: transform 0.2s ease;
}

.hamburger:active {
  transform: scale(0.92);
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.hamburger.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.is-open span:nth-child(2) {
  opacity: 0;
}

.hamburger.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav overlay */
.mobile-nav {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(8px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s ease;
}

.mobile-nav.is-open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-nav a {
  display: flex;
  align-items: center;
  justify-content: center;
  width: min(280px, 80vw);
  min-height: 52px;
  padding: 0 24px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.95);
  text-decoration: none;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-main);
  box-shadow: var(--shadow-card);
  transition: transform 0.18s ease;
}

.mobile-nav a:active {
  transform: scale(0.96);
}

.mobile-nav-divider {
  width: min(200px, 60vw);
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.25);
  margin: 4px 0;
}

.mobile-nav-divider ~ a {
  background: none;
  box-shadow: none;
  color: rgba(255, 255, 255, 0.85);
  font-size: 14px;
  min-height: 40px;
  width: auto;
  padding: 0 16px;
}

.mobile-nav-divider ~ a:active {
  opacity: 0.6;
  transform: none;
}

@media (max-width: 680px) {
  .hamburger {
    display: flex;
  }

  .mobile-nav {
    display: flex;
  }

}

@media (max-width: 680px) {
  .page-shell {
    width: min(100% - 28px, 1240px);
    padding-bottom: 56px;
  }

  .hero-card,
  .panel,
  .content-card,
  .prompt-card,
  .sheet-card,
  .detail-hero,
  .check-card,
  .callout {
    padding: 20px;
    border-radius: 22px;
  }

  .topbar {
    display: none;
  }

  .section-title {
    flex-direction: column;
    align-items: flex-start;
  }
}