/* ============================================================
   Purpose Page — 「ともに挑み、地域を支える力」
   本サイト（rmp.co.jp）のトーン＆マナーに合わせた
   白ベース・赤アクセントのコーポレートパーパスページ
   ============================================================ */

.purpose-page {
  --c-bg: #ffffff;         /* メイン背景（白） */
  --c-bg-alt: #f4f4f4;     /* セクション切り替え用のライトグレー（事業内容セクション相当） */
  --c-panel: #ececec;      /* カード・図版パネルの背景 */
  --c-ink: #262626;        /* 見出し・主要文字色（濃いグレー） */
  --c-body: #5c5c5c;       /* 本文テキスト色 */
  --c-primary: #c8161c;    /* コーポレートカラー（赤） */
  --c-line: rgba(0, 0, 0, 0.09);
  --c-lattice: rgba(200, 22, 28, 0.045); /* 背景の格子模様（赤を極薄に） */

  --font-serif: "Noto Serif JP", "Yu Mincho", serif;
  --font-sans: "Noto Sans JP", "Hiragino Kaku Gothic ProN", sans-serif;

  --measure: 34em; /* 本文の行長の目安 */
  --section-pad: clamp(4.5rem, 10vw, 8rem);

  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.9;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

.purpose-page * {
  box-sizing: border-box;
}

/* スマホ表示時のみ改行させる汎用ユーティリティ */
.purpose-page .u-sp-only {
  display: none;
}

@media (max-width: 480px) {
  .purpose-page .u-sp-only {
    display: inline;
  }
}

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

/* ------------------------------------------------------------
   共通：フェードイン演出（スクロール連動・一度だけ）
   ------------------------------------------------------------ */
.purpose-page .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 1.1s cubic-bezier(0.16, 1, 0.3, 1),
              transform 1.1s cubic-bezier(0.16, 1, 0.3, 1);
}

.purpose-page .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .purpose-page .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* ------------------------------------------------------------
   共通：セクション見出し（本サイトの「赤い短いアンダーライン」を踏襲）
   ------------------------------------------------------------ */
.purpose-page .section-label {
  display: inline-block;
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--c-primary);
  margin: 0 0 1.25rem;
}

.purpose-page .section-title {
  position: relative;
  display: inline-block;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.5rem, 3vw, 2rem);
  color: var(--c-ink);
  margin: 0 0 2.5rem;
  padding-bottom: 1rem;
}

.purpose-page .section-title::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 42px;
  height: 3px;
  background: var(--c-primary);
  transform: translateX(-50%);
}

/* ------------------------------------------------------------
   1. ヒーローセクション
   ------------------------------------------------------------ */
.purpose-hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(3rem, 8vw, 5rem) 0 clamp(5rem, 10vw, 7rem);
  overflow: hidden;
}

.purpose-hero__bg {
  position: absolute;
  inset: 0;
  background-color: var(--c-bg);
  background-image:
    repeating-linear-gradient(45deg, var(--c-lattice) 0, var(--c-lattice) 1px, transparent 1px, transparent 58px),
    repeating-linear-gradient(-45deg, var(--c-lattice) 0, var(--c-lattice) 1px, transparent 1px, transparent 58px);
  opacity: 0;
  transition: opacity 1.6s ease;
}

.purpose-page.is-loaded .purpose-hero__bg {
  opacity: 1;
}

.purpose-hero__inner {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 1.5rem;
}

.purpose-hero__mark {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  margin: 0 auto 1.75rem;
  background: var(--c-primary);
  opacity: 0;
  transform: scale(0);
  transition: opacity 0.8s ease 0.3s, transform 0.8s cubic-bezier(0.16, 1, 0.3, 1) 0.3s;
}

.purpose-hero__mark::before,
.purpose-hero__mark::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 46px;
  height: 1px;
  background: var(--c-line);
}

.purpose-hero__mark::before { right: 100%; margin-right: 12px; }
.purpose-hero__mark::after { left: 100%; margin-left: 12px; }

.purpose-page.is-loaded .purpose-hero__mark {
  opacity: 1;
  transform: scale(1);
}

.purpose-hero__copy {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2.1rem, 6vw, 4.4rem);
  letter-spacing: 0.06em;
  line-height: 1.55;
  color: var(--c-ink);
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 1.3s ease 0.7s, transform 1.3s cubic-bezier(0.16, 1, 0.3, 1) 0.7s;
}

.purpose-page.is-loaded .purpose-hero__copy {
  opacity: 1;
  transform: translateY(0);
}

.purpose-hero__sub {
  margin-top: 1.75rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  letter-spacing: 0.22em;
  color: var(--c-primary);
  opacity: 0;
  transition: opacity 1.2s ease 1.2s;
}

.purpose-page.is-loaded .purpose-hero__sub {
  opacity: 1;
}

.purpose-hero__scroll {
  position: absolute;
  left: 50%;
  bottom: clamp(1.5rem, 4vw, 2.75rem);
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  z-index: 2;
  opacity: 0;
  transition: opacity 1.2s ease 1.6s;
}

.purpose-page.is-loaded .purpose-hero__scroll {
  opacity: 1;
}

.purpose-hero__scroll span {
  font-size: 0.68rem;
  letter-spacing: 0.32em;
  color: var(--c-body);
}

.purpose-hero__scroll-line {
  width: 1px;
  height: 42px;
  background: var(--c-line);
  position: relative;
  overflow: hidden;
}

.purpose-hero__scroll-line::after {
  content: "";
  position: absolute;
  left: 0;
  top: -100%;
  width: 100%;
  height: 100%;
  background: var(--c-primary);
  animation: purpose-scroll-flow 2.6s ease-in-out infinite;
}

@keyframes purpose-scroll-flow {
  0% { top: -100%; }
  60% { top: 100%; }
  100% { top: 100%; }
}

/* ------------------------------------------------------------
   2. リードメッセージ
   ------------------------------------------------------------ */
.purpose-lead {
  background-color: var(--c-bg-alt);
  padding: var(--section-pad) 1.5rem;
}

.purpose-lead__inner {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.purpose-lead__body {
  max-width: var(--measure);
  margin: 0 auto;
  font-size: 1rem;
  color: var(--c-body);
  text-align: left;
}

.purpose-lead__body p + p {
  margin-top: 1.4em;
}

.purpose-lead__sign {
  margin: clamp(2.5rem, 5vw, 3.5rem) auto 0;
  padding-top: clamp(2rem, 4vw, 2.5rem);
  border-top: 1px solid var(--c-line);
  max-width: var(--measure);
  text-align: right;
  color: var(--c-body);
  font-size: 0.92rem;
}

.purpose-lead__sign p {
  margin: 0;
}

.purpose-lead__sign p + p {
  margin-top: 0.4em;
}

.purpose-lead__sign p:last-child {
  font-family: var(--font-serif);
  color: var(--c-ink);
  font-size: 1.02rem;
  margin-top: 0.6em;
}

/* ------------------------------------------------------------
   3. 私たちの約束（3本柱・左右交互レイアウト）
   ------------------------------------------------------------ */
.purpose-pillars {
  background-color: var(--c-bg);
  padding: var(--section-pad) 1.5rem;
}

.purpose-pillars__intro {
  max-width: 720px;
  margin: 0 auto clamp(3.5rem, 8vw, 6rem);
  text-align: center;
}

.purpose-pillar {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  gap: clamp(2rem, 6vw, 5rem);
  max-width: 1180px;
  margin: 0 auto;
}

.purpose-pillar + .purpose-pillar {
  margin-top: clamp(4rem, 9vw, 7rem);
}

.purpose-pillar--reverse .purpose-pillar__figure {
  order: 2;
}

.purpose-pillar__figure {
  position: relative;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  background-color: var(--c-panel);
  background-image:
    repeating-linear-gradient(45deg, var(--c-lattice) 0, var(--c-lattice) 1px, transparent 1px, transparent 34px),
    repeating-linear-gradient(-45deg, var(--c-lattice) 0, var(--c-lattice) 1px, transparent 1px, transparent 34px);
  display: flex;
  align-items: center;
  justify-content: center;
}

.purpose-pillar__kanji {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(6rem, 15vw, 10.5rem);
  line-height: 1;
  color: rgba(200, 22, 28, 0.12);
  user-select: none;
}

.purpose-pillar__name {
  font-family: var(--font-serif);
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--c-ink);
  margin: 0 0 1.25rem;
  padding-bottom: 1.1rem;
  border-bottom: 3px solid var(--c-primary);
  display: inline-block;
}

.purpose-pillar__text {
  max-width: 42ch;
  color: var(--c-body);
  font-size: 0.98rem;
}

/* ------------------------------------------------------------
   4. クロージング
   ------------------------------------------------------------ */
.purpose-close {
  background-color: var(--c-bg-alt);
  padding: clamp(4rem, 9vw, 6rem) 1.5rem;
  text-align: center;
  border-top: 1px solid var(--c-line);
}

.purpose-close__statement {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.2rem, 2.4vw, 1.6rem);
  color: var(--c-ink);
  max-width: 30ch;
  margin: 0 auto;
  line-height: 1.9;
}

/* ------------------------------------------------------------
   レスポンシブ（〜768px）
   ------------------------------------------------------------ */
@media (max-width: 768px) {
  .purpose-hero {
    padding: clamp(2.5rem, 8vw, 4rem) 0 clamp(4rem, 12vw, 5rem);
  }

  .purpose-hero__scroll {
    bottom: 1.5rem;
  }

  .purpose-pillar,
  .purpose-pillar--reverse {
    grid-template-columns: 1fr;
  }

  .purpose-pillar--reverse .purpose-pillar__figure {
    order: 0;
  }

  .purpose-pillar__figure {
    aspect-ratio: 16 / 10;
  }
}