/* ==========================================================================
   宇都宮駅東LRT開業記念 子ども相撲大会
   Design System: 和モダン（Refined Japanese Modern）
   ========================================================================== */

:root {
  /* Color Palette */
  --color-bg: #f9f8f4;          /* 和紙のような生成り色 */
  --color-bg-tint: #f2efe6;     /* セクション区切りの淡い生成り */
  --color-surface: #fffefb;     /* カード面 */
  --color-ink: #2a2824;         /* 見出し・墨色 */
  --color-text: #4d4a43;        /* 本文 */
  --color-text-soft: #7a766c;   /* 補助テキスト */
  --color-accent: #8f2e28;      /* 紅（アクセント） */
  --color-accent-soft: #a8514b;
  --color-gold: #a5895a;        /* 金茶（細線・装飾） */
  --color-line: #d8d2c2;        /* 罫線 */
  --color-line-strong: #bdb49c;

  /* Font Families */
  --font-mincho: 'Shippori Mincho', 'Noto Serif JP', serif;
  --font-gothic: 'Zen Maru Gothic', 'Hiragino Maru Gothic ProN', sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-gothic);
  font-weight: 400;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.9;
  letter-spacing: 0.04em;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-line);
  padding: 22px 0;
  text-align: center;
}

.site-header__badge {
  margin: 0 0 10px;
  font-family: var(--font-gothic);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  color: var(--color-accent);
}

.site-header__title {
  margin: 0;
  font-family: var(--font-mincho);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.6vw, 1.5rem);
  letter-spacing: 0.12em;
  color: var(--color-ink);
}

/* ==========================================================================
   Nav
   ========================================================================== */

.gnav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(249, 248, 244, 0.94);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-line);
}

.gnav__inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 2px 4px;
  overflow-x: auto;
  padding-top: 14px;
  padding-bottom: 14px;
  scrollbar-width: none;
}

.gnav__inner::-webkit-scrollbar {
  display: none;
}

.gnav a {
  flex: 0 0 auto;
  display: inline-block;
  padding: 6px 18px;
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease, color 0.25s ease;
}

.gnav a:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  position: relative;
  overflow: hidden;
  padding: 108px 0 96px;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: grayscale(35%);
  opacity: 0.5;
}

.hero__scrim {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(249, 248, 244, 0.55) 0%, rgba(249, 248, 244, 0.88) 55%, var(--color-bg) 100%);
}

.hero__kanji {
  position: absolute;
  top: -4vw;
  right: 2vw;
  margin: 0;
  font-family: var(--font-mincho);
  font-weight: 700;
  font-size: 22vw;
  line-height: 1;
  color: var(--color-ink);
  opacity: 0.05;
  writing-mode: vertical-rl;
  pointer-events: none;
  user-select: none;
}

.hero__inner {
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-gothic);
  font-weight: 500;
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  color: var(--color-accent);
}

.hero__title {
  margin: 0 0 28px;
  font-family: var(--font-mincho);
  font-weight: 700;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  letter-spacing: 0.08em;
  line-height: 1.6;
  color: var(--color-ink);
}

.hero__title span {
  display: inline-block;
  margin-top: 10px;
  font-size: clamp(2.1rem, 5vw, 3.1rem);
  letter-spacing: 0.14em;
}

.hero__lead {
  max-width: 640px;
  margin: 0 auto 48px;
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.05em;
  line-height: 2;
  color: var(--color-text);
}

.hero__meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  max-width: 880px;
  margin: 0 auto 48px;
  border: 1px solid var(--color-line);
  background: var(--color-line);
}

.hero__meta-item {
  background: var(--color-surface);
  padding: 26px 20px;
}

.hero__meta-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.2em;
  margin-bottom: 10px;
}

.hero__meta-value {
  display: block;
  font-family: var(--font-mincho);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--color-ink);
}

.hero__meta-value small {
  display: block;
  margin-top: 6px;
  font-family: var(--font-gothic);
  font-size: 0.74rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  color: var(--color-text-soft);
}

/* ==========================================================================
   Buttons
   ========================================================================== */

.btn {
  display: inline-block;
  border: 1px solid var(--color-ink);
  border-radius: 2px;
  padding: 14px 44px;
  font-family: var(--font-mincho);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.16em;
  color: var(--color-ink);
  text-decoration: none;
  background: transparent;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.btn--primary:hover {
  background: var(--color-ink);
  color: var(--color-bg);
}

/* ==========================================================================
   Section common
   ========================================================================== */

.section {
  padding: 96px 0;
  scroll-margin-top: 64px;
}

.section--tint {
  background-color: var(--color-bg-tint);
}

.section--formal {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-line);
}

.section__head {
  display: flex;
  align-items: flex-start;
  gap: 28px;
  margin-bottom: 28px;
}

.section__label {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0;
  padding-top: 4px;
  font-family: var(--font-mincho);
  color: var(--color-accent);
  flex: none;
}

.section__label-kanji {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.section__label-en {
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.3em;
  color: var(--color-text-soft);
}

.section__eyebrow {
  margin: 0 0 6px;
  font-family: var(--font-gothic);
  font-weight: 500;
  font-size: 0.76rem;
  letter-spacing: 0.28em;
  color: var(--color-accent);
}

.section__title {
  margin: 0;
  font-family: var(--font-mincho);
  font-weight: 700;
  font-size: clamp(1.4rem, 2.8vw, 1.9rem);
  letter-spacing: 0.1em;
  color: var(--color-ink);
}

.section__lead {
  max-width: 640px;
  margin: 0 0 48px;
  font-size: 0.98rem;
  letter-spacing: 0.04em;
  line-height: 2;
}

.section__lead--formal {
  max-width: 720px;
}

.section__note {
  max-width: 700px;
  margin: -16px 0 48px;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  padding-left: 1px;
}

/* ==========================================================================
   Breather (sky strip)
   ========================================================================== */

.breather {
  position: relative;
  height: 220px;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
  justify-content: center;
}

.breather::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(42, 40, 36, 0.18);
}

.breather__text {
  position: relative;
  writing-mode: vertical-rl;
  font-family: var(--font-mincho);
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: 0.4em;
  color: #fff;
  text-shadow: 0 1px 6px rgba(0, 0, 0, 0.35);
}

/* ==========================================================================
   Info Cards
   ========================================================================== */

.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-bottom: 16px;
  background: var(--color-line);
  border: 1px solid var(--color-line);
}

.info-card {
  background: var(--color-surface);
  padding: 30px 26px;
}

.info-card__title {
  margin: 0 0 14px;
  font-family: var(--font-mincho);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-ink);
  position: relative;
  padding-left: 16px;
}

.info-card__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  bottom: 5px;
  width: 2px;
  background: var(--color-accent);
}

.info-card__body {
  margin: 0;
  font-size: 0.92rem;
  letter-spacing: 0.04em;
}

/* ==========================================================================
   Media pair (schedule / leaflet)
   ========================================================================== */

.media-pair {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 760px;
  margin: 0 auto;
}

.media-card {
  margin: 0;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 2px;
  padding: 14px;
  text-align: center;
}

.media-card img {
  margin: 0 auto 12px;
}

.media-card figcaption {
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--color-text-soft);
}

/* ==========================================================================
   Entry section
   ========================================================================== */

.check-list {
  max-width: 720px;
  margin: 0 0 48px;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--color-line);
}

.check-list li {
  position: relative;
  padding: 16px 0 16px 28px;
  font-size: 0.94rem;
  letter-spacing: 0.03em;
  border-bottom: 1px solid var(--color-line);
}

.check-list li::before {
  content: "・";
  position: absolute;
  left: 0;
  top: 15px;
  color: var(--color-accent);
  font-weight: 700;
}

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

.deadline-card {
  max-width: 480px;
  border: 1px solid var(--color-ink);
  padding: 22px 36px;
  text-align: center;
}

.deadline-card__label {
  display: block;
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.24em;
  color: var(--color-accent);
  margin-bottom: 8px;
}

.deadline-card__date {
  display: block;
  font-family: var(--font-mincho);
  font-size: 1.2rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-ink);
}

/* ==========================================================================
   Greeting cards
   ========================================================================== */

.greeting-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 2px;
  padding: 44px 40px;
  margin-bottom: 28px;
}

.greeting-card:last-child {
  margin-bottom: 0;
}

.greeting-card__name {
  margin: 0 0 22px;
  font-family: var(--font-mincho);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  padding-bottom: 18px;
  border-bottom: 1px solid var(--color-line);
}

.greeting-card__body p {
  margin: 0 0 20px;
  font-size: 0.94rem;
  letter-spacing: 0.03em;
  line-height: 2;
}

.greeting-card__body p:last-child {
  margin-bottom: 0;
}

/* ==========================================================================
   Akashi / Article cards
   ========================================================================== */

.section--stone {
  position: relative;
  background-image:
    linear-gradient(rgba(242, 239, 230, 0.94), rgba(242, 239, 230, 0.94)),
    url('img/pexels/stone-texture.jpg');
  background-size: cover;
  background-position: center;
}

.akashi-hero__images {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  max-width: 640px;
  margin: 0 auto 56px;
}

.akashi-hero__images img {
  border: 1px solid var(--color-line-strong);
  filter: grayscale(15%);
}

.article-card {
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 2px;
  padding: 44px 40px;
  margin-bottom: 28px;
}

.article-card:last-child {
  margin-bottom: 0;
}

.article-card__title {
  margin: 0 0 10px;
  font-family: var(--font-mincho);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-ink);
  line-height: 1.7;
}

.article-card__author {
  margin: 0 0 22px;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--color-accent);
}

.article-card__body p {
  margin: 0 0 20px;
  font-size: 0.92rem;
  letter-spacing: 0.03em;
  line-height: 2;
}

.article-card__body p:last-child {
  margin-bottom: 0;
}

.article-card__quote {
  position: relative;
  margin: 0;
  padding: 26px 24px;
  border: 1px solid var(--color-line-strong);
  background-size: cover;
  background-position: center;
  text-align: center;
  overflow: hidden;
}

.article-card__quote::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(249, 248, 244, 0.86);
}

.article-card__quote span {
  position: relative;
  display: block;
  font-family: var(--font-mincho);
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  line-height: 1.9;
}

.article-card__figure {
  margin: 28px 0 0;
  text-align: center;
}

.article-card__figure img {
  display: inline-block;
  max-width: 320px;
  border: 1px solid var(--color-line);
}

/* ==========================================================================
   Nunohiki split card
   ========================================================================== */

.split-card {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 40px;
  align-items: center;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 2px;
  padding: 40px;
  margin-bottom: 32px;
}

.split-card__figure {
  margin: 0;
}

.split-card__figure img {
  border: 1px solid var(--color-line-strong);
}

.split-card__body p {
  margin: 0 0 18px;
  font-size: 0.92rem;
  letter-spacing: 0.03em;
  line-height: 2;
}

.split-card__note {
  border-left: 2px solid var(--color-accent);
  padding: 4px 0 4px 18px;
  font-size: 0.86rem;
  color: var(--color-text-soft);
}

.split-card__credit {
  text-align: right;
  font-size: 0.82rem;
  color: var(--color-text-soft);
  margin-bottom: 0 !important;
}

.wood-strip {
  height: 64px;
  background-size: cover;
  background-position: center 70%;
  border: 1px solid var(--color-line);
  filter: grayscale(20%);
}

/* ==========================================================================
   Sponsor Grid (記念誌イメージ)
   ========================================================================== */

.sponsor-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}

.sponsor-item__btn {
  display: block;
  width: 100%;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  font: inherit;
  color: inherit;
  text-align: left;
}

.sponsor-item__frame {
  display: flex;
  align-items: center;
  justify-content: center;
  aspect-ratio: 3 / 4;
  background: var(--color-surface);
  border: 1px solid var(--color-line-strong);
  padding: 8px;
  overflow: hidden;
}

.sponsor-item__frame img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  transition: opacity 0.25s ease;
}

.sponsor-item__btn:hover .sponsor-item__frame img {
  opacity: 0.8;
}

.sponsor-item__btn:hover .sponsor-item__frame {
  border-color: var(--color-accent);
}

.sponsor-item__label {
  display: block;
  margin-top: 10px;
  text-align: center;
  font-family: var(--font-mincho);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--color-text-soft);
}

/* ==========================================================================
   Lightbox
   ========================================================================== */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
}

.lightbox.is-open {
  display: block;
}

.lightbox__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(20, 18, 15, 0.88);
}

.lightbox__inner {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
}

.lightbox__image {
  max-width: min(90vw, 760px);
  max-height: 76vh;
  width: auto;
  border: 1px solid rgba(255, 255, 255, 0.2);
  background: #fff;
}

.lightbox__caption {
  margin: 18px 0 0;
  font-family: var(--font-mincho);
  letter-spacing: 0.14em;
  color: #f2efe6;
  font-size: 0.9rem;
}

.lightbox__close {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 40px;
  height: 40px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  background: transparent;
  color: #fff;
  font-size: 1.4rem;
  line-height: 1;
  cursor: pointer;
}

.lightbox__nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border: 1px solid rgba(255, 255, 255, 0.4);
  background: transparent;
  color: #fff;
  font-size: 1.8rem;
  line-height: 1;
  cursor: pointer;
}

.lightbox__nav--prev {
  left: 24px;
}

.lightbox__nav--next {
  right: 24px;
}

/* ==========================================================================
   Committee (実行委員会)
   ========================================================================== */

.committee-block {
  margin-bottom: 44px;
}

.committee-block:last-child {
  margin-bottom: 0;
}

.committee-block__title {
  margin: 0 0 4px;
  font-family: var(--font-mincho);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--color-accent);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-line-strong);
}

.committee-roll {
  margin: 0;
  padding: 0;
  list-style: none;
}

.committee-roll--grid2,
.committee-roll--grid3 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  column-gap: 32px;
}

.committee-roll--grid3 {
  grid-template-columns: repeat(3, 1fr);
}

.committee-roll__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 13px 0;
  font-size: 0.9rem;
  letter-spacing: 0.03em;
  border-bottom: 1px solid var(--color-line);
}

.committee-roll__role {
  flex: none;
  font-size: 0.78rem;
  color: var(--color-text-soft);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.committee-roll__name {
  font-family: var(--font-mincho);
  font-weight: 600;
  color: var(--color-ink);
  letter-spacing: 0.06em;
}

.committee-roll__note {
  margin-left: auto;
  font-size: 0.76rem;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  white-space: nowrap;
}

.committee-roll__divider {
  height: 1px;
  margin: 8px 0;
  background: var(--color-line-strong);
  list-style: none;
}

.committee-roll--grid2 .committee-roll__divider--span,
.committee-roll--grid3 .committee-roll__divider--span {
  grid-column: 1 / -1;
}

.committee-supporters {
  margin: 0;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  line-height: 2.1;
  color: var(--color-text);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background: var(--color-ink);
  padding: 44px 0;
  text-align: center;
}

.site-footer__title {
  margin: 0 0 10px;
  color: var(--color-bg);
  font-family: var(--font-mincho);
  font-weight: 700;
  letter-spacing: 0.1em;
  font-size: 1rem;
}

.site-footer__org {
  margin: 0;
  color: #b7b2a5;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
}

/* ==========================================================================
   Responsive: Tablet
   ========================================================================== */

@media (max-width: 860px) {
  .hero__meta {
    grid-template-columns: 1fr;
    max-width: 420px;
  }

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

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

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

  .split-card__figure img {
    max-width: 320px;
    margin: 0 auto;
  }

  .sponsor-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .committee-roll--grid3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ==========================================================================
   Responsive: Mobile
   ========================================================================== */

@media (max-width: 560px) {
  .gnav__inner {
    gap: 0 2px;
    padding-top: 8px;
    padding-bottom: 8px;
  }

  .gnav a {
    padding: 6px 10px;
    font-size: 0.72rem;
    letter-spacing: 0.03em;
  }

  .section {
    padding: 72px 0;
  }

  .hero {
    padding: 76px 0 72px;
  }

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

  .section__head {
    gap: 16px;
  }

  .section__label-kanji {
    font-size: 1.05rem;
  }

  .media-pair {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .greeting-card,
  .article-card,
  .split-card {
    padding: 30px 22px;
  }

  .akashi-hero__images {
    grid-template-columns: 1fr;
  }

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

  .committee-roll--grid2,
  .committee-roll--grid3 {
    grid-template-columns: 1fr;
  }

  .committee-roll__item {
    flex-wrap: wrap;
  }

  .committee-roll__note {
    margin-left: 0;
  }

  .btn {
    width: 100%;
    text-align: center;
    padding: 16px 24px;
  }

  .lightbox__nav {
    width: 40px;
    height: 40px;
    font-size: 1.4rem;
  }

  .lightbox__inner {
    padding: 20px;
  }
}