:root {
  --ink: #101a2f;
  --muted: #5f6b7a;
  --line: #dce3eb;
  --paper: #f6f8fb;
  --white: #fff;
  --blue: #0067b8;
  --cyan: #00a4ef;
  --orange: #f5a623;
  --radius: 18px;
  --shadow: 0 18px 50px rgb(16 26 47 / 10%);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--white);
  font-family: Inter, "Noto Sans JP", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.75;
}

a {
  color: inherit;
}

img {
  display: block;
  max-width: 100%;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: -100px;
  left: 1rem;
  padding: 0.7rem 1rem;
  color: var(--white);
  background: var(--ink);
}

.skip-link:focus {
  top: 1rem;
}

.site-header {
  position: sticky;
  z-index: 20;
  top: 0;
  border-bottom: 1px solid rgb(220 227 235 / 85%);
  background: rgb(255 255 255 / 93%);
  backdrop-filter: blur(16px);
}

.header-inner,
.footer-inner,
.hero,
.section,
.page-hero,
.article,
.about-band {
  width: min(1180px, calc(100% - 40px));
  margin-inline: auto;
}

.header-inner {
  display: flex;
  min-height: 74px;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  color: var(--white);
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  font-size: 1.35rem;
  font-weight: 900;
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.15;
}

.brand strong {
  font-size: 1.15rem;
  letter-spacing: 0.08em;
}

.brand small {
  margin-top: 0.2rem;
  color: var(--muted);
  font-size: 0.68rem;
}

nav {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

nav a {
  color: #334155;
  font-size: 0.87rem;
  font-weight: 700;
  text-decoration: none;
}

nav a:hover,
.text-link:hover {
  color: var(--blue);
}

.hero {
  display: grid;
  min-height: 650px;
  align-items: center;
  gap: clamp(2rem, 6vw, 6rem);
  grid-template-columns: 1.02fr 0.98fr;
  padding-block: 72px;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--blue);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.19em;
}

.hero h1,
.page-hero h1,
.article-header h1 {
  margin: 0;
  font-size: clamp(2.6rem, 6vw, 5.3rem);
  letter-spacing: -0.055em;
  line-height: 1.1;
}

.hero h1 span,
.about-band h2 span {
  color: var(--blue);
}

.hero-lead {
  max-width: 620px;
  margin: 1.7rem 0 0;
  color: var(--muted);
  font-size: clamp(1rem, 2vw, 1.25rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2.2rem;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.25rem;
  border: 1px solid var(--blue);
  border-radius: 999px;
  font-size: 0.88rem;
  font-weight: 800;
  text-decoration: none;
}

.button-primary {
  color: var(--white);
  background: var(--blue);
}

.button-primary:hover {
  background: #004f8e;
}

.button-secondary {
  color: var(--blue);
  background: var(--white);
}

.hero-visual {
  position: relative;
  overflow: hidden;
  min-height: 485px;
  border-radius: 28px 28px 90px 28px;
  background: linear-gradient(145deg, #dff3ff, #e6ebf2);
  box-shadow: var(--shadow);
}

.hero-visual > img,
.hero-placeholder {
  width: 100%;
  height: 485px;
  object-fit: cover;
}

.hero-placeholder,
.card-placeholder {
  display: grid;
  place-items: center;
  color: rgb(255 255 255 / 88%);
  background:
    linear-gradient(135deg, rgb(0 103 184 / 90%), rgb(0 164 239 / 72%)),
    radial-gradient(circle at 70% 20%, var(--orange), transparent 35%);
  font-size: 4rem;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.hero-event {
  position: absolute;
  right: 24px;
  bottom: 24px;
  left: 24px;
  padding: 1.25rem 1.35rem;
  border: 1px solid rgb(255 255 255 / 55%);
  border-radius: 16px;
  color: var(--white);
  background: rgb(16 26 47 / 86%);
  backdrop-filter: blur(12px);
}

.hero-event span,
.hero-event time {
  display: block;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.hero-event strong {
  display: block;
  margin: 0.25rem 0;
  font-size: 1.05rem;
  line-height: 1.45;
}

.topics {
  display: grid;
  border-block: 1px solid var(--line);
  grid-template-columns: repeat(4, 1fr);
}

.topics p {
  margin: 0;
  padding: 1rem;
  border-right: 1px solid var(--line);
  color: #748091;
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  text-align: center;
}

.section {
  padding-block: 96px;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 2rem;
  margin-bottom: 2rem;
}

.section-heading h2,
.about-band h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.4rem);
  letter-spacing: -0.04em;
  line-height: 1.2;
}

.section-heading > a {
  color: var(--blue);
  font-weight: 800;
  text-decoration: none;
}

.card-grid {
  display: grid;
  gap: 1.4rem;
  grid-template-columns: repeat(3, 1fr);
}

.event-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--white);
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.event-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-4px);
}

.card-image {
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #e7edf4;
}

.card-image img,
.card-placeholder {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card-placeholder {
  font-size: 2rem;
}

.card-body {
  padding: 1.25rem;
}

.card-meta {
  display: flex;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.72rem;
}

.card-meta span {
  color: var(--blue);
  font-weight: 900;
}

.card-body h3 {
  margin: 0.7rem 0;
  font-size: 1.08rem;
  line-height: 1.5;
}

.card-body h3 a {
  text-decoration: none;
}

.card-body p {
  display: -webkit-box;
  overflow: hidden;
  margin: 0;
  color: var(--muted);
  font-size: 0.83rem;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
}

.about-band {
  display: grid;
  gap: clamp(3rem, 8vw, 8rem);
  grid-template-columns: 1fr 1fr;
  margin-bottom: 100px;
  padding: clamp(2rem, 6vw, 5rem);
  border-radius: 28px;
  color: var(--white);
  background: var(--ink);
}

.about-band > div:last-child {
  align-self: center;
  color: #cbd5e1;
}

.about-band .text-link {
  display: inline-block;
  margin-top: 1rem;
  color: #7dd3fc;
}

.page-hero {
  padding-block: 100px 55px;
}

.page-hero h1 {
  font-size: clamp(2.7rem, 6vw, 5rem);
}

.page-hero > p:last-child {
  max-width: 680px;
  color: var(--muted);
}

.article {
  max-width: 900px;
  padding-block: 85px 110px;
}

.article-header {
  margin-bottom: 2.5rem;
}

.article-header h1 {
  font-size: clamp(2.1rem, 5vw, 4.1rem);
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  margin-top: 1.4rem;
  color: var(--muted);
  font-size: 0.82rem;
}

.article-meta a {
  color: var(--blue);
}

.article-cover {
  width: 100%;
  max-height: 560px;
  margin-bottom: 2.5rem;
  border-radius: var(--radius);
  object-fit: cover;
}

.article-content {
  font-size: 1rem;
}

.article-content h2,
.article-content h3,
.article-content h4 {
  margin-top: 2.4em;
  letter-spacing: -0.025em;
  line-height: 1.4;
}

.article-content a {
  color: var(--blue);
}

.article-content table {
  display: block;
  overflow-x: auto;
  width: 100%;
  border-collapse: collapse;
  white-space: nowrap;
}

.article-content th,
.article-content td {
  padding: 0.7rem 0.85rem;
  border: 1px solid var(--line);
  text-align: left;
}

.article-content th {
  background: var(--paper);
}

.article-content blockquote {
  margin-inline: 0;
  padding: 0.8rem 1.4rem;
  border-left: 4px solid var(--cyan);
  color: var(--muted);
  background: var(--paper);
}

.article-content iframe {
  width: 100%;
  max-width: 100%;
  min-height: 420px;
  border: 0;
}

.article-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.text-link {
  color: var(--blue);
  font-weight: 800;
  text-decoration: none;
}

.error-page {
  min-height: 65vh;
  text-align: center;
}

.site-footer {
  padding-block: 55px;
  color: #cbd5e1;
  background: #0b1222;
}

.footer-inner {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr 2fr 1fr;
}

.footer-inner strong {
  color: var(--white);
  font-size: 1.35rem;
  letter-spacing: 0.08em;
}

.footer-inner p {
  margin: 0;
}

.copyright {
  text-align: right;
}

@media (max-width: 850px) {
  nav a:nth-child(-n + 2) {
    display: none;
  }

  .hero,
  .about-band {
    grid-template-columns: 1fr;
  }

  .hero {
    padding-block: 50px;
  }

  .hero-visual {
    min-height: 400px;
  }

  .hero-visual > img,
  .hero-placeholder {
    height: 400px;
  }

  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-inner {
    grid-template-columns: 1fr;
  }

  .copyright {
    text-align: left;
  }
}

@media (max-width: 560px) {
  .header-inner,
  .footer-inner,
  .hero,
  .section,
  .page-hero,
  .article,
  .about-band {
    width: min(100% - 28px, 1180px);
  }

  nav {
    gap: 1rem;
  }

  nav a {
    font-size: 0.75rem;
  }

  .brand small {
    display: none;
  }

  .hero {
    min-height: auto;
  }

  .hero h1 {
    font-size: 2.65rem;
  }

  .topics {
    grid-template-columns: repeat(2, 1fr);
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding-block: 70px;
  }

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

  .about-band {
    margin-bottom: 70px;
    padding: 2rem;
  }

  .article {
    padding-block: 55px 80px;
  }

  .article-footer {
    align-items: start;
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .event-card {
    transition: none;
  }
}