@charset "UTF-8";
/*
Theme Name: Rikka Club Child
Theme URI: https://rikkaclub.com
Template: swell
Description: SWELL用 Rikka Club 公式サイト 子テーマ。設計書 01.設計/ に準拠。デザインガイドライン §2 のカラー・タイポを CSS変数として定義し、front-page.php / archive-sponsor.php でブランドUIを実装する。
Author: Rikka Club
Version: 0.3.0
Text Domain: rikka-club-child
*/

/* =========================================================
   設計書 02.デザインガイドライン.md §2.4 の CSS 変数を継承
   ========================================================= */
:root {
  /* Brand */
  --color-rikka-navy: #0E2D4F;
  --color-rikka-navy-hover: #1A4A7E;
  --color-ink: #000000;
  --color-charcoal: #333333;
  --color-white: #FFFFFF;

  /* Surfaces */
  --color-surface: #FFFFFF;
  --color-surface-alt: #F4F4F4;
  --color-surface-stone: #B2AFAF;

  /* Lines */
  --color-border: #E5E5E5;

  /* Semantic */
  --color-link: var(--color-rikka-navy);
  --color-link-hover: var(--color-rikka-navy-hover);
  --color-success: #2E7D5B;
  --color-error: #A03333;

  /* Tier accent */
  --color-platinum: #6B6359;
  --color-gold: #8B7635;
  --color-silver: #5F646A;

  /* Typography
     設計書 §3.2 — Adobe Fonts プロジェクトで DIN 2014 Bold を採用(2026-06-04)
     ※ DIN Next LT Pro は Adobe Fonts 提供外だったため、代替候補の DIN 2014 を使用 */
  --font-display: "din-2014", "DIN 2014", "DIN Next LT Pro", "Barlow", "Helvetica Neue", Arial, sans-serif;
  --font-sans: "Noto Sans JP", "Hiragino Sans", "Yu Gothic", sans-serif;
  --font-body: var(--font-sans);

  /* Layout */
  --container-max: 1200px;
  --container-pad-pc: 40px;
  --container-pad-sp: 20px;
  --section-pad-pc: 96px;
  --section-pad-sp: 56px;
}

/* =========================================================
   ベース上書き(SWELL のリセットを残しつつ、和文タイポと
   リンク色を Rikka Navy 基調に揃える)
   ========================================================= */
html {
  /* アンカーリンク(#sponsors 等)クリック時のスムーズスクロール */
  scroll-behavior: smooth;
}
body {
  font-family: var(--font-body);
  color: var(--color-charcoal);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden; /* ヒーロー全開ブレイクアウトの副作用で出る横スクロールを防ぐ */
}

/* 各セクション最上部に、移動ヘッダーの高さ分のオフセットを確保
   (アンカーリンクで飛んだ時にヘッダーで見出しが隠れないように) */
#news,
#about,
#activities,
#sponsors,
#support,
#related,
#contact {
  scroll-margin-top: 80px;
}
a { color: var(--color-link); transition: color .2s; }
a:hover { color: var(--color-link-hover); }

.rk-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-pad-pc);
  padding-right: var(--container-pad-pc);
}
.rk-section {
  padding-top: var(--section-pad-pc);
  padding-bottom: var(--section-pad-pc);
}
.rk-section--alt { background: var(--color-surface-alt); }
.rk-section--navy {
  background: var(--color-rikka-navy);
  color: var(--color-white);
}
.rk-section-title {
  font-family: var(--font-sans);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.4;
  margin-bottom: 48px;
  color: var(--color-charcoal);
}
.rk-section--navy .rk-section-title { color: var(--color-white); }
.rk-section-title small {
  display: block;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--color-rikka-navy);
  margin-bottom: 8px;
  text-transform: uppercase;
}
.rk-section--navy .rk-section-title small { color: rgba(255, 255, 255, 0.7); }

/* ---------- Buttons ---------- */
.rk-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 32px;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-radius: 4px;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all .2s;
  text-decoration: none;
}
.rk-btn::after { content: "→"; font-size: 16px; }
.rk-btn-primary { background: var(--color-rikka-navy); color: var(--color-white); }
.rk-btn-primary:hover { background: var(--color-rikka-navy-hover); color: var(--color-white); }
.rk-btn-outline-white { background: transparent; color: var(--color-white); border-color: var(--color-white); }
.rk-btn-outline-white:hover { background: var(--color-white); color: var(--color-rikka-navy); }
.rk-btn-outline-navy { background: transparent; color: var(--color-rikka-navy); border-color: var(--color-rikka-navy); }
.rk-btn-outline-navy:hover { background: var(--color-rikka-navy); color: var(--color-white); }

/* ---------- Hero ---------- */
.rk-hero {
  /* SWELL の内側コンテンツ枠(max-width: 1200px等)から脱出して
     画面全開(viewport幅)に広げるブレイクアウト */
  position: relative;
  left: 50%;
  right: 50%;
  width: 100vw;
  max-width: 100vw;
  margin-left: -50vw;
  margin-right: -50vw;

  min-height: 720px;
  background: var(--color-rikka-navy);
  color: var(--color-white);
  display: flex;
  align-items: center;
  overflow: hidden;
}
.rk-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: var(--rk-hero-bg, url('assets/images/pattern-bg.png'));
  background-size: 600px;
  background-repeat: repeat;
  opacity: 0.18;
  mix-blend-mode: screen;
}
.rk-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(14, 45, 79, 0) 0%, rgba(14, 45, 79, 0.6) 100%);
}
.rk-hero .rk-container {
  position: relative;
  z-index: 2;
  padding-top: 120px;
  padding-bottom: 80px;
}
.rk-hero-eyebrow {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 24px;
}
.rk-hero-title {
  font-family: var(--font-sans);
  font-size: 56px;
  font-weight: 900;
  line-height: 1.3;
  margin-bottom: 24px;
  letter-spacing: 0.04em;
}
.rk-hero-title-en {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: 32px;
  display: block;
}
.rk-hero-lead {
  font-size: 17px;
  line-height: 2;
  max-width: 640px;
  margin-bottom: 40px;
  color: rgba(255, 255, 255, 0.9);
}
.rk-hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* =========================================================
   ピックアップスライダー(ヒーローとお知らせの間)
     - Swiper.js v11 (CDN) で初期化
     - 中央スライドを強調、左右に次/前スライドが少し見える
     - SP では1枚ずつ表示
   ========================================================= */
.rk-pickup-section {
  padding: 64px 0 48px;
  background: var(--color-white);
  overflow: hidden;
}
.rk-pickup-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 16px;
  position: relative;
}
.rk-pickup-slider {
  width: 100%;
  padding: 0 0 40px; /* 下にページネーションのスペース */
  /* キャプションは外に出したのでデフォルトの 50% 中央でOK */
  --swiper-navigation-top-offset: 50%;
}
.rk-pickup-slider .swiper-slide {
  display: flex;
  flex-direction: column;
  align-items: center;
}
/* スライドエフェクト時のみ、両端スライドを半透明にして中央を強調
   フェードエフェクト時(.swiper-fade) は Swiper が opacity を直接制御するので適用しない */
.rk-pickup-slider:not(.swiper-fade) .swiper-slide {
  transition: opacity .3s, transform .3s;
  opacity: 0.45;
  transform: scale(0.96);
}
.rk-pickup-slider:not(.swiper-fade) .swiper-slide-active {
  opacity: 1;
  transform: scale(1);
}
.rk-slide-link {
  display: block;
  width: 100%;
  text-decoration: none;
  color: inherit;
}
.rk-slide-image {
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--color-surface-alt);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 16px rgba(14, 45, 79, 0.08);
}
.rk-slide-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.rk-slide-placeholder {
  font-family: var(--font-display);
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--color-surface-stone);
  text-transform: uppercase;
}
/* スライダー外に出した新キャプション領域(JSで切替表示) */
.rk-pickup-caption {
  margin: 32px auto 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-charcoal);
  text-align: center;
  max-width: 720px;
  padding: 0 16px;
  min-height: 1.7em; /* 空でも高さを確保してレイアウトが跳ねないように */
}

/* Swiper の矢印・ドットを Rikka Navy に統一 */
.rk-pickup-slider .swiper-button-prev,
.rk-pickup-slider .swiper-button-next {
  color: var(--color-rikka-navy);
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.92);
  border-radius: 50%;
  box-shadow: 0 2px 8px rgba(14, 45, 79, 0.15);
  transition: background .2s;
  z-index: 10; /* キャプション・他のコンテンツより必ず手前 */
}
.rk-pickup-slider .swiper-button-prev:hover,
.rk-pickup-slider .swiper-button-next:hover {
  background: var(--color-white);
}
.rk-pickup-slider .swiper-button-prev::after,
.rk-pickup-slider .swiper-button-next::after {
  font-size: 16px;
  font-weight: 700;
}
.rk-pickup-slider .swiper-pagination-bullet {
  background: var(--color-surface-stone);
  opacity: 0.5;
  width: 8px;
  height: 8px;
}
.rk-pickup-slider .swiper-pagination-bullet-active {
  background: var(--color-rikka-navy);
  opacity: 1;
  width: 24px;
  border-radius: 4px;
}

/* ---------- News ---------- */
.rk-news-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.rk-news-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  padding: 24px;
  transition: transform .2s, box-shadow .2s;
  text-decoration: none;
  color: inherit;
  display: block;
}
.rk-news-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(14, 45, 79, 0.10);
}
.rk-news-card time {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--color-rikka-navy);
  display: block;
  margin-bottom: 8px;
}
.rk-news-tag {
  display: inline-block;
  background: var(--color-rikka-navy);
  color: var(--color-white);
  font-size: 11px;
  padding: 2px 10px;
  margin-left: 8px;
  letter-spacing: 0.08em;
}
.rk-news-card h3 {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.6;
  margin-top: 8px;
}
.rk-news-empty {
  text-align: center;
  color: var(--color-surface-stone);
  padding: 32px 0;
  font-size: 14px;
}

/* ---------- About ---------- */
.rk-about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.rk-about-mark { display: flex; justify-content: center; }
.rk-about-mark img { max-width: 320px; height: auto; }
.rk-about-text h3 {
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-rikka-navy);
  text-transform: uppercase;
  margin-bottom: 12px;
}
.rk-about-text h2 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 24px;
}
.rk-about-text p { font-size: 16px; line-height: 2; margin-bottom: 16px; }

/* ---------- Activities ---------- */
.rk-activities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.rk-activity-card {
  background: var(--color-white);
  border-top: 4px solid var(--color-rikka-navy);
  padding: 32px 24px;
}
.rk-activity-card .rk-num {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  color: var(--color-rikka-navy);
  letter-spacing: 0.05em;
  display: block;
  margin-bottom: 12px;
}
.rk-activity-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 12px; }
.rk-activity-card p { font-size: 14px; line-height: 1.9; }

/* ---------- Sponsors ---------- */
.rk-tier-block { margin-bottom: 64px; }
.rk-tier-block:last-of-type { margin-bottom: 0; }
.rk-tier-label {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  padding: 4px 12px;
  border: 1px solid currentColor;
  margin-bottom: 12px;
}
.rk-tier-platinum { color: var(--color-platinum); }
.rk-tier-gold { color: var(--color-gold); }
.rk-tier-silver { color: var(--color-silver); }

/* =========================================================
   スポンサーカード(2026-06-05 デザイン変更:ロゴ単体浮かせ版)
     - 背景・枠線なし、ロゴだけがセクション背景に浮く
     - 階層はロゴサイズ・列数で表現
     - Platinum 3列(大) > Gold 4列(中) > Silver 6列(小)
   ========================================================= */

/* Platinum: 3列、ロゴ最大サイズ・背景なし */
.rk-platinum-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}
.rk-sponsor-card-pt {
  background: transparent;
  border: none;
  padding: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 180px;
  text-decoration: none;
  transition: transform .2s, opacity .2s;
}
.rk-sponsor-card-pt:hover {
  transform: translateY(-2px);
  opacity: 0.85;
}
.rk-sponsor-card-pt .rk-logo-box {
  width: 100%;
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.rk-sponsor-card-pt .rk-logo-box img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
/* ロゴ画像が無い場合のフォールバック(社名テキスト) */
.rk-sponsor-card-pt .rk-logo-box:not(:has(img)) {
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 700;
  color: var(--color-charcoal);
  text-align: center;
}

/* Gold: 4列、ロゴ中サイズ・背景なし */
.rk-gold-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.rk-sponsor-card-gold {
  background: transparent;
  border: none;
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 120px;
  text-decoration: none;
  transition: transform .2s, opacity .2s;
}
.rk-sponsor-card-gold:hover {
  transform: translateY(-2px);
  opacity: 0.85;
}
.rk-sponsor-card-gold .rk-logo-box {
  width: 100%;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.rk-sponsor-card-gold .rk-logo-box img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
.rk-sponsor-card-gold .rk-logo-box:not(:has(img)) {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-charcoal);
  text-align: center;
}

/* Silver: 6列、ロゴ小サイズ・背景なし */
.rk-silver-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}
.rk-sponsor-card-silver {
  background: transparent;
  border: none;
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px;
  text-decoration: none;
  transition: opacity .2s;
}
.rk-sponsor-card-silver:hover { opacity: 0.7; }
.rk-sponsor-card-silver img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
}
/* Silverのロゴ無しフォールバック */
.rk-sponsor-card-silver:not(:has(img)) {
  font-family: var(--font-sans);
  font-size: 11px;
  font-weight: 700;
  color: var(--color-charcoal);
  text-align: center;
  letter-spacing: 0.02em;
}

/* 案内文(ロゴをクリックすると…) */
.rk-sponsors-note {
  text-align: center;
  font-size: 13px;
  color: #777;
  margin-bottom: 32px;
}

.rk-sponsors-empty {
  background: var(--color-white);
  border: 1px dashed var(--color-border);
  padding: 32px;
  text-align: center;
  color: var(--color-surface-stone);
  font-size: 14px;
}

.rk-sponsors-cta {
  text-align: center;
  margin-top: 56px;
  padding-top: 48px;
  border-top: 1px solid var(--color-border);
}
.rk-sponsors-cta p { margin-bottom: 24px; font-size: 15px; }

/* ---------- Support / Campaigns ---------- */
.rk-campaign-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.rk-campaign-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  display: flex;
  overflow: hidden;
}
.rk-campaign-card .rk-thumb {
  width: 200px;
  background: linear-gradient(135deg, var(--color-rikka-navy), var(--color-rikka-navy-hover));
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.4);
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.1em;
}
.rk-campaign-card .rk-thumb img { width: 100%; height: 100%; object-fit: cover; }
.rk-campaign-card .rk-body { padding: 24px; flex: 1; }
.rk-campaign-card .rk-badge {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  background: var(--color-success);
  color: var(--color-white);
  padding: 2px 10px;
  margin-bottom: 12px;
}
.rk-campaign-card .rk-badge.is-closed { background: var(--color-surface-stone); }
.rk-campaign-card h3 {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  margin-bottom: 8px;
}
.rk-campaign-card .rk-deadline { font-size: 13px; color: #777; margin-bottom: 12px; }
.rk-campaign-card .rk-ext-link {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-rikka-navy);
}

/* ---------- Related sites ---------- */
.rk-related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.rk-related-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 32px 24px;
  text-align: center;
  color: var(--color-white);
  text-decoration: none;
  transition: background .2s;
}
.rk-related-card:hover { background: rgba(255, 255, 255, 0.10); color: var(--color-white); }
.rk-related-card .rk-icon {
  width: 48px;
  height: 48px;
  border: 2px solid var(--color-white);
  border-radius: 50%;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
}
.rk-related-card h3 { font-size: 16px; font-weight: 700; margin-bottom: 8px; }
.rk-related-card p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 16px;
  line-height: 1.8;
}
.rk-related-card .rk-ext {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

/* ---------- CTA ---------- */
.rk-cta {
  text-align: center;
  padding: 80px 0;
  background: var(--color-surface-alt);
}
.rk-cta h2 { font-size: 32px; font-weight: 700; margin-bottom: 16px; }
.rk-cta p { margin-bottom: 32px; font-size: 15px; }

/* ---------- Footer add-ons (SWELLフッターに追加する帯) ---------- */
.rk-footer-strip {
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding: 32px 0;
}
.rk-footer-strip-label {
  font-family: var(--font-display);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.5);
  text-align: center;
  margin-bottom: 16px;
}
.rk-footer-strip-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 8px;
}
.rk-footer-strip-grid a {
  height: 40px;
  background: rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 9px;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.5);
}
.rk-footer-strip-grid a img { max-width: 80%; max-height: 70%; object-fit: contain; filter: grayscale(1) brightness(2); opacity: 0.6; }

/* ---------- Responsive ---------- */
@media (max-width: 959px) {
  .rk-container { padding-left: var(--container-pad-sp); padding-right: var(--container-pad-sp); }
  .rk-section { padding-top: var(--section-pad-sp); padding-bottom: var(--section-pad-sp); }

  .rk-hero-title { font-size: 32px; }
  .rk-hero-title-en { font-size: 16px; }
  .rk-hero { min-height: 560px; }

  .rk-news-list,
  .rk-activities-grid,
  .rk-related-grid,
  .rk-campaign-grid {
    grid-template-columns: 1fr;
  }
  /* スポンサーは小型化しつつ複数列維持(ブランド一覧の見通しを保つ) */
  .rk-platinum-grid { grid-template-columns: repeat(2, 1fr); }
  .rk-gold-grid     { grid-template-columns: repeat(2, 1fr); }
  .rk-silver-grid   { grid-template-columns: repeat(3, 1fr); }
  .rk-sponsor-card-pt { min-height: 160px; padding: 24px 20px; }
  .rk-sponsor-card-pt .rk-logo-box { height: 100px; }
  .rk-sponsor-card-gold { min-height: 100px; padding: 16px 12px; }
  .rk-sponsor-card-gold .rk-logo-box { height: 60px; }
  .rk-sponsor-card-silver { height: 80px; padding: 8px; }

  /* ピックアップスライダー: SP では余白圧縮+矢印小さく */
  .rk-pickup-section { padding: 40px 0 32px; }
  .rk-pickup-slider { padding-bottom: 40px; }
  .rk-pickup-slider .swiper-button-prev,
  .rk-pickup-slider .swiper-button-next { width: 36px; height: 36px; }
  .rk-pickup-slider .swiper-button-prev::after,
  .rk-pickup-slider .swiper-button-next::after { font-size: 14px; }
  .rk-slide-caption { font-size: 13px; }
  .rk-about-grid { grid-template-columns: 1fr; gap: 32px; }
  .rk-about-mark img { max-width: 200px; }
  .rk-footer-strip-grid { grid-template-columns: repeat(4, 1fr); }
}