:root {
  --ink: #171717;
  --muted: #66645f;
  --paper: #f7f7f4;
  --white: #ffffff;
  --line: #d9d8d2;
  --accent: #b52a2f;
  --accent-dark: #8c1e23;
  --header-height: 64px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Yu Gothic", "Hiragino Kaku Gothic ProN", Meiryo, sans-serif;
  line-height: 1.75;
  letter-spacing: 0;
}

button,
a {
  font: inherit;
}

a {
  color: inherit;
}

.site-header {
  position: fixed;
  z-index: 10;
  top: 0;
  right: 0;
  left: 0;
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(20px, 5vw, 72px);
  color: var(--white);
  background: rgb(16 20 24 / 82%);
  border-bottom: 1px solid rgb(255 255 255 / 18%);
  backdrop-filter: blur(10px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 32px;
  height: 32px;
  place-items: center;
  color: var(--ink);
  background: var(--white);
  border-radius: 50%;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 16px;
}

.header-link {
  font-size: 13px;
  font-weight: 700;
  text-underline-offset: 4px;
}

.hero {
  position: relative;
  min-height: min(850px, 100svh);
  display: grid;
  align-items: center;
  padding: calc(var(--header-height) + 70px) clamp(24px, 8vw, 130px) 80px;
  overflow: hidden;
  color: var(--white);
  background-image: url("assets/aomori-winter-reunion-hero.webp");
  background-position: center;
  background-size: cover;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgb(3 13 25 / 82%) 0%, rgb(3 13 25 / 62%) 43%, rgb(3 13 25 / 8%) 76%),
    linear-gradient(0deg, rgb(3 13 25 / 42%) 0%, transparent 48%);
}

.hero-content {
  position: relative;
  z-index: 1;
  width: min(680px, 100%);
}

.status {
  display: inline-block;
  margin: 0 0 32px;
  padding: 7px 12px;
  color: var(--white);
  background: var(--accent);
  border-radius: 3px;
  font-size: 12px;
  font-weight: 700;
}

.eyebrow,
.section-kicker {
  margin: 0 0 12px;
  font-family: Arial, sans-serif;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
}

.hero h1 {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(46px, 6.3vw, 88px);
  font-weight: 600;
  line-height: 1.22;
}

.hero-lead {
  max-width: 590px;
  margin: 30px 0 0;
  font-size: clamp(15px, 1.6vw, 18px);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 36px;
}

.button {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

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

.button-primary:hover {
  background: var(--accent-dark);
}

.button-secondary {
  color: var(--white);
  background: rgb(0 0 0 / 18%);
  border-color: rgb(255 255 255 / 62%);
}

.hero-caption {
  position: absolute;
  z-index: 1;
  right: 24px;
  bottom: 16px;
  margin: 0;
  font-size: 10px;
  opacity: 0.72;
}

.section {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  padding: 104px 0;
}

.section-heading {
  max-width: 650px;
}

.section-kicker {
  color: var(--accent);
}

.section h2 {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(32px, 4vw, 52px);
  font-weight: 600;
  line-height: 1.35;
}

.section-heading > p:last-child {
  margin: 20px 0 0;
  color: var(--muted);
}

.facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 56px 0 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
}

.facts div {
  min-width: 0;
  padding: 28px 22px;
  border-right: 1px solid var(--line);
}

.facts div:last-child {
  border-right: 0;
}

.facts dt {
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.facts dd {
  margin: 0;
  font-size: 22px;
  font-weight: 700;
}

.facts span {
  display: block;
  margin-top: 6px;
  color: var(--muted);
  font-size: 12px;
}

.facts dd span {
  display: inline;
  margin: 0;
  color: inherit;
  font-size: inherit;
}

.story {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(48px, 8vw, 110px);
  align-items: start;
}

.story-copy p:not(.section-kicker) {
  margin: 24px 0 0;
  color: var(--muted);
}

.steps {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ink);
}

.steps li {
  display: grid;
  grid-template-columns: 54px 1fr;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.steps li > span {
  grid-row: 1 / 3;
  color: var(--accent);
  font-family: Arial, sans-serif;
  font-size: 13px;
  font-weight: 700;
}

.steps strong {
  font-size: 18px;
}

.steps small {
  color: var(--muted);
}

.invitation {
  width: 100%;
  padding-right: max(24px, calc((100vw - 1120px) / 2));
  padding-left: max(24px, calc((100vw - 1120px) / 2));
  background: var(--white);
}

.letter {
  max-width: 760px;
  margin-top: 48px;
  padding: 40px;
  background: var(--paper);
  border-left: 4px solid var(--accent);
}

.letter p {
  margin: 0;
  white-space: pre-line;
}

.text-button {
  display: inline-flex;
  gap: 18px;
  margin-top: 28px;
  padding: 0 0 5px;
  color: var(--accent);
  background: transparent;
  border: 0;
  border-bottom: 1px solid currentColor;
  cursor: pointer;
  font-weight: 700;
}

.check-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0 48px;
  margin: 52px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ink);
}

.check-list li {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 10px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line);
}

.check-list li > span {
  color: var(--accent);
  font-family: Arial, sans-serif;
  font-size: 13px;
  font-weight: 700;
}

.check-list strong,
.check-list small {
  display: block;
}

.check-list small {
  margin-top: 4px;
  color: var(--muted);
}

.final-cta {
  display: grid;
  justify-items: center;
  padding: 96px 24px;
  text-align: center;
  color: var(--white);
  background: var(--accent);
}

.final-cta p {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 600;
  line-height: 1.5;
}

.button-light {
  margin-top: 28px;
  color: var(--accent);
  background: var(--white);
}

.final-cta small {
  max-width: 650px;
  margin-top: 24px;
  opacity: 0.82;
}

footer {
  padding: 40px 24px;
  color: #c8c8c8;
  background: #191919;
  text-align: center;
  font-size: 12px;
}

footer p {
  margin: 4px 0;
}

.toast {
  position: fixed;
  z-index: 20;
  right: 20px;
  bottom: 20px;
  padding: 12px 16px;
  color: var(--white);
  background: var(--ink);
  border-radius: 4px;
  box-shadow: 0 12px 34px rgb(0 0 0 / 24%);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease;
  pointer-events: none;
  font-size: 13px;
}

.toast.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 760px) {
  :root {
    --header-height: 58px;
  }

  .site-header {
    padding: 0 16px;
  }

  .header-link {
    display: none;
  }

  .hero {
    min-height: 780px;
    padding: 108px 24px 76px;
    background-position: 62% center;
  }

  .hero-overlay {
    background:
      linear-gradient(90deg, rgb(3 13 25 / 78%) 0%, rgb(3 13 25 / 45%) 100%),
      linear-gradient(0deg, rgb(3 13 25 / 62%) 0%, transparent 60%);
  }

  .status {
    margin-bottom: 24px;
  }

  .hero-actions {
    display: grid;
  }

  .button {
    width: 100%;
  }

  .hero-caption {
    right: 16px;
    left: 16px;
    text-align: right;
  }

  .section {
    width: min(100% - 32px, 1120px);
    padding: 72px 0;
  }

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

  .facts div {
    padding: 22px 14px;
  }

  .facts div:nth-child(2) {
    border-right: 0;
  }

  .facts div:nth-child(-n + 2) {
    border-bottom: 1px solid var(--line);
  }

  .facts dd {
    font-size: 18px;
  }

  .story {
    display: block;
  }

  .steps {
    margin-top: 48px;
  }

  .invitation {
    width: 100%;
    padding-right: 16px;
    padding-left: 16px;
  }

  .letter {
    padding: 28px 22px;
  }

  .check-list {
    grid-template-columns: 1fr;
  }

  .final-cta {
    padding: 72px 20px;
  }

  .toast {
    right: 16px;
    bottom: 16px;
    left: 16px;
    text-align: center;
  }
}

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

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}
/* トップページ・招待状ページ */
.global-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}

.global-nav a {
  position: relative;
  padding: 20px 0 18px;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

.global-nav a::after {
  position: absolute;
  right: 0;
  bottom: 12px;
  left: 0;
  height: 2px;
  background: var(--white);
  content: "";
  opacity: 0;
}

.global-nav a:hover::after,
.global-nav a[aria-current="page"]::after {
  opacity: 1;
}

.intro,
.invitation-detail {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(48px, 8vw, 112px);
  align-items: start;
}

.intro-copy p,
.invitation-message p {
  margin: 0 0 22px;
  color: var(--muted);
}

.topics-band,
.invitation-summary {
  background: var(--white);
}

.topic-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 48px;
}

.topic-card {
  min-height: 310px;
  display: flex;
  flex-direction: column;
  padding: 28px;
  background: var(--paper);
  border-top: 3px solid var(--line);
}

.topic-card-featured {
  border-top-color: var(--accent);
}

.topic-meta {
  display: flex;
  gap: 12px;
  color: var(--muted);
  font-family: Arial, sans-serif;
  font-size: 11px;
  font-weight: 700;
}

.topic-card h3 {
  margin: 26px 0 12px;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: 24px;
  line-height: 1.45;
}

.topic-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

.topic-card > a {
  margin-top: auto;
  padding-top: 26px;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
}

.coming-soon {
  width: fit-content;
  margin-top: auto;
  padding: 7px 10px;
  color: var(--muted);
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 3px;
  font-size: 11px;
  font-weight: 700;
}

.role-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-top: 44px;
  padding: 32px 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--line);
}

.role-panel strong {
  font-size: 21px;
}

.role-panel p {
  margin: 8px 0 0;
  color: var(--muted);
}

.role-panel .notice {
  margin: 0;
  padding-left: 24px;
  border-left: 1px solid var(--line);
  font-size: 13px;
}

.page-hero {
  min-height: 520px;
  display: grid;
  align-items: end;
  padding: calc(var(--header-height) + 90px) max(24px, calc((100vw - 1120px) / 2)) 80px;
  color: var(--white);
  background:
    linear-gradient(90deg, rgb(3 13 25 / 86%), rgb(3 13 25 / 25%)),
    url("assets/aomori-winter-reunion-hero.webp") center 52% / cover;
}

.page-hero > div {
  width: min(680px, 100%);
}

.page-hero .section-kicker {
  color: var(--white);
}

.page-hero h1 {
  margin: 0;
  font-family: "Yu Mincho", "Hiragino Mincho ProN", serif;
  font-size: clamp(48px, 6vw, 78px);
  font-weight: 600;
  line-height: 1.25;
}

.page-hero p:last-child {
  margin: 24px 0 0;
  font-size: 17px;
}

.invitation-lead h2 {
  margin-top: 0;
}

.summary-list {
  margin: 44px 0 0;
  border-top: 1px solid var(--ink);
}

.summary-list div {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.summary-list dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.summary-list dd {
  margin: 0;
  font-weight: 700;
}

.response-actions {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-top: 44px;
}

.response-actions > div {
  min-height: 190px;
  display: flex;
  flex-direction: column;
  padding: 28px;
  background: var(--white);
  border-top: 3px solid var(--line);
}

.response-actions strong {
  font-size: 19px;
}

.response-actions p {
  color: var(--muted);
  font-size: 14px;
}

.final-cta-dark {
  background: #242424;
}

@media (max-width: 760px) {
  .global-nav {
    gap: 14px;
  }

  .global-nav a {
    font-size: 11px;
  }

  .intro,
  .invitation-detail {
    display: block;
  }

  .intro-copy,
  .invitation-message {
    margin-top: 36px;
  }

  .topic-grid,
  .response-actions {
    grid-template-columns: 1fr;
  }

  .topic-card {
    min-height: 270px;
  }

  .role-panel {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .role-panel .notice {
    padding: 24px 0 0;
    border-top: 1px solid var(--line);
    border-left: 0;
  }

  .page-hero {
    min-height: 480px;
    padding: calc(var(--header-height) + 70px) 20px 60px;
    background-position: 62% center;
  }

  .summary-list div {
    grid-template-columns: 92px 1fr;
    gap: 14px;
  }
}
.page-top {
  position: fixed;
  z-index: 18;
  right: 22px;
  bottom: 22px;
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: rgb(23 23 23 / 92%);
  border: 1px solid rgb(255 255 255 / 22%);
  border-radius: 50%;
  box-shadow: 0 8px 24px rgb(0 0 0 / 24%);
  cursor: pointer;
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 160ms ease, transform 160ms ease, background 160ms ease;
  pointer-events: none;
  font-size: 22px;
  line-height: 1;
}

.page-top:hover {
  background: var(--accent);
}

.page-top.is-visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

@media (max-width: 760px) {
  .page-top {
    right: 16px;
    bottom: 16px;
    width: 46px;
    height: 46px;
  }
}