/* ========================================
   株式会社free bullet コーポレートサイト
   ======================================== */

/* ----- 【色の変更箇所】CSSカスタムプロパティ ----- */
:root {
  /* メインカラー（淡い青系） */
  --color-bg-light: #E8F1F8;
  --color-bg-gradient-start: #E8F1F8;
  --color-bg-gradient-end: #D4E6F4;

  /* アクセントカラー（青系） */
  --color-accent: #4A90D9;
  --color-accent-hover: #3A7BC8;
  --color-accent-light: rgba(74, 144, 217, 0.12);

  /* ベースカラー */
  --color-white: #FFFFFF;
  --color-text: #333333;
  --color-text-muted: #666666;
  --color-border: #D0DDE8;

  /* レイアウト */
  --header-height: 88px;
  --container-max: 1120px;
  --section-padding: clamp(80px, 12vw, 140px);
  --gap: clamp(24px, 4vw, 48px);

  /* トランジション・アニメーション */
  --transition: 0.3s ease;
  --transition-slow: 0.6s ease-out;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --duration-fade: 1.2s;
  --stagger-step: 80ms;
}

/* ----- リセット & ベース ----- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: "Shippori Mincho", "Hiragino Mincho ProN", "Yu Mincho", serif;
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ----- ユーティリティ ----- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(20px, 5vw, 40px);
}

/* ----- ボタン ----- */
.btn {
  display: inline-block;
  padding: 14px 36px;
  font-size: 15px;
  letter-spacing: 0.08em;
  border-radius: 2px;
  transition:
    background-color var(--transition),
    color var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

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

.btn--primary:hover {
  background-color: var(--color-accent-hover);
  box-shadow: 0 4px 14px rgba(74, 144, 217, 0.28);
}

.btn--outline {
  background-color: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.btn--outline:hover {
  background-color: var(--color-accent-light);
  box-shadow: 0 4px 14px rgba(74, 144, 217, 0.16);
}

.btn--full {
  width: 100%;
  text-align: center;
}

/* ----- フェードインアニメーション（スクロール連動） ----- */
/* デフォルトは表示（JS未読込・動きを減らす設定時のフォールバック） */
.fade-in {
  opacity: 1;
  transform: none;
}

/* アニメーション有効時のみ非表示スタート → is-visible でふわっと表示 */
@media (prefers-reduced-motion: no-preference) {
  .fade-in {
    opacity: 0;
    transform: translateY(60px);
    transition:
      opacity var(--duration-fade) var(--ease-out),
      transform var(--duration-fade) var(--ease-out);
    transition-delay: var(--fade-delay, 0ms);
    will-change: opacity, transform;
  }

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

/* 開発確認用: ?motion=1 で OS の「動きを減らす」設定を上書き */
html.force-motion .fade-in {
  opacity: 0;
  transform: translateY(60px);
  transition:
    opacity var(--duration-fade) var(--ease-out),
    transform var(--duration-fade) var(--ease-out);
  transition-delay: var(--fade-delay, 0ms);
  will-change: opacity, transform;
}

html.force-motion .fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* アクセシビリティ: 動きを減らす設定 */
@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
    transition: none;
    will-change: auto;
  }

  .news-card,
  .member-card,
  .btn,
  .member-card__photo {
    transition: none;
  }

  .news-card.fade-in.is-visible:hover,
  .member-card.fade-in.is-visible:hover {
    transform: none;
  }

  .member-card.fade-in.is-visible:hover .member-card__photo,
  .news-card.fade-in.is-visible:hover {
    box-shadow: none;
  }

  .btn--primary:hover,
  .btn--outline:hover {
    box-shadow: none;
  }
}

/* ========================================
   ヘッダー
   ======================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  z-index: 1000;
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.header__logo img {
  height: 72px;
  width: auto;
}

/* ハンバーガーメニュー */
.header__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 40px;
  height: 40px;
  padding: 8px;
  z-index: 1001;
}

.header__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--transition), opacity var(--transition);
}

.header__hamburger.is-active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.header__hamburger.is-active span:nth-child(2) {
  opacity: 0;
}

.header__hamburger.is-active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.header__menu {
  display: flex;
  gap: clamp(16px, 3vw, 36px);
}

.header__link {
  font-size: 14px;
  letter-spacing: 0.06em;
  position: relative;
  padding-bottom: 4px;
  transition: color var(--transition);
}

.header__link::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--color-accent);
  transition: width var(--transition);
}

.header__link:hover {
  color: var(--color-accent);
}

.header__link:hover::after {
  width: 100%;
}

/* ========================================
   ヒーロー
   ======================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  /* 【画像の差し替え場所】ヒーロー背景: images/hero.jpg */
  background:
    linear-gradient(
      160deg,
      rgba(232, 241, 248, 0.82) 0%,
      rgba(212, 230, 244, 0.72) 100%
    ),
    url("../images/hero.jpg") center center / cover no-repeat;
  padding: calc(var(--header-height) + 60px) 0 80px;
  overflow: hidden;
}

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

.hero__title {
  font-size: clamp(32px, 6vw, 56px);
  font-weight: 500;
  letter-spacing: 0.15em;
  line-height: 1.5;
  margin-bottom: clamp(40px, 6vw, 64px);
  color: var(--color-text);
}

.hero__cta {
  font-size: clamp(14px, 2vw, 16px);
}

/* ヒーロー登場演出（JSで遅延付与） */
.hero .fade-in {
  transition-delay: var(--fade-delay, 0ms);
}

/* ========================================
   セクション共通
   ======================================== */
.section {
  padding: var(--section-padding) 0;
}

.section:nth-child(even) {
  background-color: var(--color-bg-light);
}

.section__title {
  font-size: clamp(24px, 4vw, 32px);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-align: center;
  margin-bottom: clamp(48px, 8vw, 80px);
  color: var(--color-text);
}

/* ========================================
   お知らせ
   ======================================== */
.news__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}

.news-card {
  background-color: var(--color-white);
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 2px 16px rgba(74, 144, 217, 0.08);
  transition:
    transform var(--transition),
    box-shadow var(--transition);
}

.news-card.fade-in.is-visible:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(74, 144, 217, 0.14);
}

.news-card__image {
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

.news-card__image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.news-card__body {
  padding: clamp(20px, 3vw, 28px);
}

.news-card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.news-card__date {
  font-size: 13px;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

.news-card__category {
  display: inline-block;
  padding: 2px 10px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--color-accent);
  background-color: var(--color-accent-light);
  border-radius: 2px;
}

.news-card__title {
  font-size: clamp(16px, 2vw, 18px);
  font-weight: 600;
  line-height: 1.6;
  margin-bottom: 12px;
}

.news-card__excerpt {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.8;
  white-space: pre-line;
}

.news__more-wrap {
  text-align: center;
  margin-top: clamp(40px, 6vw, 56px);
}

.news__extra {
  margin-top: var(--gap);
}

.news__extra .news__grid {
  margin-top: var(--gap);
}

/* ========================================
   サービス（アコーディオン）
   ======================================== */
.accordion {
  max-width: 800px;
  margin: 0 auto;
}

.accordion__item {
  border-bottom: 1px solid var(--color-border);
}

.accordion__item:first-child {
  border-top: 1px solid var(--color-border);
}

.accordion__trigger {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 16px;
  width: 100%;
  padding: clamp(20px, 3vw, 28px) 0;
  text-align: left;
  transition: color var(--transition);
}

.accordion__trigger:hover {
  color: var(--color-accent);
}

.accordion__heading {
  font-size: clamp(16px, 2.5vw, 18px);
  font-weight: 600;
  letter-spacing: 0.06em;
}

.accordion__catch {
  font-size: 14px;
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
}

.accordion__icon {
  margin-left: auto;
  width: 20px;
  height: 20px;
  position: relative;
  flex-shrink: 0;
}

.accordion__icon::before,
.accordion__icon::after {
  content: "";
  position: absolute;
  background-color: var(--color-accent);
  transition: transform var(--transition);
}

.accordion__icon::before {
  top: 50%;
  left: 0;
  width: 100%;
  height: 2px;
  transform: translateY(-50%);
}

.accordion__icon::after {
  top: 0;
  left: 50%;
  width: 2px;
  height: 100%;
  transform: translateX(-50%);
}

.accordion__trigger[aria-expanded="true"] .accordion__icon::after {
  transform: translateX(-50%) rotate(90deg);
  opacity: 0;
}

.accordion__panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow), padding var(--transition-slow);
}

.accordion__trigger[aria-expanded="true"] + .accordion__panel {
  max-height: 300px;
  padding-bottom: clamp(20px, 3vw, 28px);
}

.accordion__trigger[aria-expanded="true"] + .accordion__panel--rich {
  max-height: 4000px;
}

.accordion__content .accordion__body + .accordion__body {
  margin-top: 0.75em;
}

.accordion__subheading {
  margin-top: clamp(28px, 4vw, 40px);
  margin-bottom: clamp(16px, 2.5vw, 24px);
  font-size: clamp(15px, 2.2vw, 17px);
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--color-text);
}

.accordion__body {
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.9;
  padding-left: 0;
}

/* 過去事例カード */
.case-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.5vw, 20px);
}

@media (min-width: 640px) {
  .case-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 960px) {
  .case-cards {
    grid-template-columns: repeat(3, 1fr);
  }
}

.case-card {
  padding: clamp(18px, 2.5vw, 24px);
  background-color: var(--color-bg-light);
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.case-card__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.case-card__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.case-card__item dt {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-accent);
}

.case-card__item dd {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-muted);
}

.case-card--feature {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.case-card__title {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-text);
  line-height: 1.6;
}

.case-card__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-muted);
}

/* RenGo コミュニティ事業（ビジュアルショーケース） */
.accordion:has(.rengo-showcase) {
  max-width: 800px;
}

.rengo-showcase {
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3vw, 32px);
}

.rengo-showcase__lead {
  text-align: center;
  max-width: 40em;
  margin-inline: auto;
}

.rengo-showcase__cta {
  text-align: center;
  margin-top: 0;
}

.rengo-visual {
  width: min(88%, 480px);
  max-width: 480px;
  margin-inline: auto;
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  box-shadow: 0 4px 20px rgba(74, 144, 217, 0.08);
  transition:
    box-shadow var(--transition),
    transform var(--transition);
}

.rengo-visual:hover {
  box-shadow: 0 8px 28px rgba(74, 144, 217, 0.14);
  transform: translateY(-2px);
}

.rengo-visual--hero {
  width: min(92%, 520px);
  max-width: 520px;
  border: none;
  box-shadow: none;
  background: transparent;
  border-radius: 0;
}

.rengo-visual--hero:hover {
  transform: none;
  box-shadow: none;
}

.rengo-visual img {
  width: 100%;
  height: auto;
  display: block;
}

.rengo-showcase__pair {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.5vw, 24px);
  width: min(100%, 640px);
  margin-inline: auto;
}

@media (min-width: 900px) {
  .rengo-showcase__pair {
    grid-template-columns: repeat(2, 1fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .rengo-visual:hover {
    transform: none;
  }
}

/* ========================================
   メンバー
   ======================================== */
.members__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(40px, 6vw, 64px);
  align-items: start;
}

.member-card {
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 4vw, 32px);
  transition: transform var(--transition);
}

.member-card.fade-in.is-visible:hover {
  transform: translateY(-4px);
}

/* 写真枠: 縦4:横3（3/4）— 表示幅はカラムの半分 */
.member-card__photo {
  position: relative;
  width: 50%;
  max-width: 50%;
  margin-inline: auto;
  aspect-ratio: 3 / 4;
  overflow: hidden;
  border-radius: 8px;
  background-color: var(--color-bg-light);
  box-shadow: 0 4px 20px rgba(74, 144, 217, 0.12);
  transition: box-shadow var(--transition);
}

.member-card.fade-in.is-visible:hover .member-card__photo {
  box-shadow: 0 8px 28px rgba(74, 144, 217, 0.2);
}

.member-card__photo img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
}

.member-card__role {
  font-size: 13px;
  color: var(--color-accent);
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

.member-card__name {
  font-size: clamp(22px, 3vw, 26px);
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
}

.member-card__name-en {
  font-size: 14px;
  color: var(--color-text-muted);
  letter-spacing: 0.06em;
  margin-bottom: clamp(20px, 3vw, 28px);
}

.member-card__details {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.member-card__detail dt {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-accent);
  margin-bottom: 10px;
  letter-spacing: 0.08em;
}

.member-card__detail dd {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 2;
  text-indent: 1em;
}

.member-card__detail dd:has(.member-card__career) {
  text-indent: 0;
}

/* 経歴: 箇条書き（会社名 = 太字、実績 = 通常テキスト） */
.member-card__career {
  list-style: none;
  padding: 0;
  margin: 0;
  text-indent: 0;
}

.member-card__career li {
  position: relative;
  padding-left: 1.1em;
  margin-bottom: 14px;
  line-height: 1.85;
}

.member-card__career li:last-child {
  margin-bottom: 0;
}

.member-card__career li::before {
  content: "・";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: 600;
}

.member-card__career li strong {
  display: block;
  font-weight: 600;
  color: var(--color-text);
}

.member-card__career li em {
  display: block;
  font-style: normal;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* ========================================
   お問い合わせフォーム
   ======================================== */
.contact-form {
  max-width: 640px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 28px;
}

.form-label {
  display: block;
  font-size: 14px;
  letter-spacing: 0.06em;
  margin-bottom: 8px;
}

.form-required {
  font-size: 12px;
  color: var(--color-accent);
  margin-left: 8px;
}

.form-input,
.form-textarea {
  width: 100%;
  padding: 14px 16px;
  font-family: inherit;
  font-size: 15px;
  color: var(--color-text);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: 2px;
  transition: border-color var(--transition);
}

.form-input:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-textarea {
  resize: vertical;
  min-height: 160px;
}

.form-error {
  font-size: 13px;
  color: #C0392B;
  margin-top: 6px;
  min-height: 20px;
}

.form-input.is-error,
.form-textarea.is-error {
  border-color: #C0392B;
}

/* ========================================
   会社情報
   ======================================== */
.company-table {
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  border-collapse: collapse;
}

.company-table th,
.company-table td {
  padding: clamp(16px, 3vw, 24px);
  border-bottom: 1px solid var(--color-border);
  text-align: left;
  vertical-align: top;
  font-size: 15px;
  line-height: 1.8;
}

.company-table th {
  width: 30%;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--color-text);
  white-space: nowrap;
}

.company-table td {
  color: var(--color-text-muted);
}

/* ========================================
   フッター
   ======================================== */
.footer {
  background-color: var(--color-text);
  color: rgba(255, 255, 255, 0.85);
  padding: clamp(48px, 8vw, 64px) 0 clamp(32px, 5vw, 48px);
}

.footer__inner {
  text-align: center;
}

.footer__company {
  font-size: 16px;
  letter-spacing: 0.1em;
  margin-bottom: 24px;
}

.footer__menu {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: clamp(12px, 3vw, 28px);
  margin-bottom: 32px;
}

.footer__menu a {
  font-size: 13px;
  letter-spacing: 0.06em;
  transition: color var(--transition);
}

.footer__menu a:hover {
  color: var(--color-white);
}

.footer__copyright {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  letter-spacing: 0.04em;
}

/* ========================================
   レスポンシブ: タブレット
   ======================================== */
@media (max-width: 900px) {
  .news__grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .members__grid {
    grid-template-columns: 1fr;
    max-width: 560px;
    margin: 0 auto;
  }

  /* スマホ・タブレット: 写真を中央揃え（従来の半分） */
  .member-card__photo {
    width: 50%;
    max-width: 180px;
    margin-left: auto;
    margin-right: auto;
  }
}

/* ========================================
   レスポンシブ: スマホ
   ======================================== */
@media (max-width: 640px) {
  :root {
    --header-height: 72px;
  }

  .header__logo img {
    height: 56px;
  }

  /* ハンバーガーメニュー表示 */
  .header__hamburger {
    display: flex;
  }

  .header__nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background-color: var(--color-white);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.08);
    transition: right var(--transition);
    padding: calc(var(--header-height) + 32px) 32px 32px;
    z-index: 999;
  }

  .header__nav.is-open {
    right: 0;
  }

  .header__menu {
    flex-direction: column;
    gap: 0;
  }

  .header__link {
    display: block;
    padding: 16px 0;
    font-size: 15px;
    border-bottom: 1px solid var(--color-border);
  }

  .header__link::after {
    display: none;
  }

  /* お知らせ: 1カラム */
  .news__grid {
    grid-template-columns: 1fr;
  }

  /* 会社情報テーブル: 縦積み */
  .company-table th,
  .company-table td {
    display: block;
    width: 100%;
    padding: 12px 0;
  }

  .company-table th {
    border-bottom: none;
    padding-bottom: 4px;
  }

  .company-table td {
    padding-top: 0;
    padding-bottom: 20px;
  }

  /* アコーディオン: 縦積み */
  .accordion__trigger {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding-right: 32px;
    position: relative;
  }

  .accordion__icon {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
  }

  .accordion__catch {
    width: 100%;
  }
}

/* オーバーレイ（モバイルメニュー開時） */
.nav-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.3);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition), visibility var(--transition);
}

.nav-overlay.is-visible {
  opacity: 1;
  visibility: visible;
}