/* =========================================================
   株式会社 中村製作所 TOPページ スタイルシート
   ベースカラー   : #FFFFFF
   メインカラー   : #082B61
   濃い背景色     : #031A3A
   本文色         : #222222
   補助色         : #F5F6F8
   罫線色         : #D9DEE7
   ========================================================= */

:root {
  --color-white: #FFFFFF;
  --color-primary: #082B61;
  --color-dark-bg: #031A3A;
  --color-text: #222222;
  --color-light-gray: #F5F6F8;
  --color-border: #D9DEE7;

  --max-width: 1200px;
  --pad-pc: 40px;
  --pad-tablet: 32px;
  --pad-sp: 20px;

  --section-pad-pc: 96px;
  --section-pad-sp: 64px;

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

  --header-height: 80px;
}

/* ---------- リセット ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--color-text);
  background-color: var(--color-white);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

h1, h2, h3, p {
  margin: 0;
}

button {
  font-family: inherit;
  cursor: pointer;
}

/* 横スクロール防止 */
html, body {
  max-width: 100%;
}

/* フォーカス状態は消さない */
a:focus-visible,
button:focus-visible {
  outline: 3px solid #4C8DFF;
  outline-offset: 2px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 8px;
  top: -48px;
  background: var(--color-primary);
  color: var(--color-white);
  padding: 10px 16px;
  border-radius: 4px;
  z-index: 1000;
  transition: top .2s ease;
}
.skip-link:focus {
  top: 8px;
}

/* ---------- 共通レイアウト ---------- */
.section-title {
  font-size: 26px;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: .02em;
  position: relative;
  padding-bottom: 16px;
}
.section-title::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 40px;
  height: 3px;
  background-color: var(--color-primary);
}
.section-title--center {
  text-align: center;
}
.section-title--center::after {
  left: 50%;
  transform: translateX(-50%);
}
.section-title--light {
  color: var(--color-white);
}
.section-title--light::after {
  background-color: var(--color-white);
}

.section-lead {
  margin-top: 20px;
  color: #4a4a4a;
  font-size: 15px;
}
.section-lead--light {
  color: #C4CEDE;
}

/* ---------- ボタン ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 48px;
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 500;
  border: 1px solid transparent;
  border-radius: 2px;
  transition: background-color .2s ease, color .2s ease, border-color .2s ease;
}

.btn--outline {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background-color: transparent;
}
.btn--outline:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn--light {
  background-color: var(--color-white);
  color: var(--color-primary);
}
.btn--light:hover {
  background-color: var(--color-light-gray);
}

.btn--small {
  min-height: 44px;
  padding: 10px 20px;
  font-size: 14px;
}

.btn__icon {
  width: 18px;
  height: 18px;
}

/* =========================================================
   ヘッダー
   ========================================================= */
.header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  z-index: 500;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  height: var(--header-height);
}

.header__inner {
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--pad-pc);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.header__logo-mark {
  width: 36px;
  height: 36px;
}
.header__logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}
.header__logo-main {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
}
.header__logo-sub {
  font-size: 9px;
  letter-spacing: .08em;
  color: #6b7482;
}

.header__nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.header__nav-list {
  display: flex;
  align-items: center;
  gap: 28px;
}
.header__nav-list a {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  transition: border-color .2s ease, color .2s ease;
}
.header__nav-list a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.header__cta {
  background-color: var(--color-primary);
  color: var(--color-white);
  font-size: 14px;
  font-weight: 500;
  padding: 12px 24px;
  border-radius: 2px;
  white-space: nowrap;
  transition: background-color .2s ease;
}
.header__cta:hover {
  background-color: #0a3676;
}

.header__menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  position: relative;
  flex-shrink: 0;
}
.header__menu-icon,
.header__menu-icon::before,
.header__menu-icon::after {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-primary);
  transition: transform .25s ease, opacity .25s ease;
}
.header__menu-icon::before,
.header__menu-icon::after {
  content: "";
  position: absolute;
}
.header__menu-icon::before { transform: translateY(-7px); }
.header__menu-icon::after { transform: translateY(7px); }

.header__menu-btn[aria-expanded="true"] .header__menu-icon {
  background-color: transparent;
}
.header__menu-btn[aria-expanded="true"] .header__menu-icon::before {
  transform: translateY(0) rotate(45deg);
}
.header__menu-btn[aria-expanded="true"] .header__menu-icon::after {
  transform: translateY(0) rotate(-45deg);
}

.header__overlay {
  display: none;
}

/* =========================================================
   HERO
   ========================================================= */
.hero {
  position: relative;
  height: 680px;
  max-height: 82vh;
  min-height: 480px;
  overflow: hidden;
}
.hero__media {
  position: absolute;
  inset: 0;
}
.hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 78% center;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg,
    rgba(3, 26, 58, .88) 0%,
    rgba(3, 26, 58, .68) 30%,
    rgba(3, 26, 58, .28) 55%,
    rgba(3, 26, 58, 0) 75%);
}
.hero__inner {
  position: relative;
  max-width: var(--max-width);
  height: 100%;
  margin: 0 auto;
  padding: 0 var(--pad-pc);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.hero__title {
  color: var(--color-white);
  font-size: 56px;
  line-height: 1.35;
  font-weight: 900;
  letter-spacing: .02em;
}
.hero__lead {
  margin-top: 28px;
  color: var(--color-white);
  font-size: 17px;
  line-height: 1.9;
}

/* =========================================================
   私たちについて
   ========================================================= */
.about {
  padding: var(--section-pad-pc) var(--pad-pc);
}
.about__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about__body {
  margin-top: 24px;
  font-size: 15px;
  line-height: 2;
  color: var(--color-text);
}
.about__text .btn {
  margin-top: 32px;
}
.about__media img {
  width: 100%;
  height: auto; /* HTML側のwidth/height属性より aspect-ratio を優先させるために明示指定 */
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* =========================================================
   事業内容
   ========================================================= */
.services {
  padding: var(--section-pad-pc) var(--pad-pc);
  background-color: var(--color-light-gray);
}
.services__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.services__head {
  text-align: center;
}
.services__head .section-title {
  display: inline-block;
}
.services__list {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.service-card {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}
.service-card__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.service-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(3, 26, 58, 0) 40%, rgba(3, 26, 58, .85) 100%);
}
.service-card__body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 24px;
  color: var(--color-white);
}
.service-card__title {
  font-size: 19px;
  font-weight: 700;
}
.service-card__desc {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.8;
  color: #E4E9F1;
}
.service-card__arrow {
  margin-top: 14px;
  width: 22px;
  height: 22px;
  filter: invert(1);
}

/* =========================================================
   中村製作所の強み
   ========================================================= */
.strengths {
  padding: var(--section-pad-pc) var(--pad-pc);
}
.strengths__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.strengths__list {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
}
.strength-card {
  text-align: center;
  padding: 32px 16px;
  border: 1px solid var(--color-border);
}
.strength-card img {
  margin: 0 auto;
}
.strength-card__title {
  margin-top: 20px;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-primary);
}
.strength-card__desc {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.8;
  color: #4a4a4a;
}

/* =========================================================
   製作事例
   ========================================================= */
.works {
  padding: var(--section-pad-pc) var(--pad-pc);
  background-color: var(--color-light-gray);
}
.works__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.works__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.works__list {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}
.works__item {
  aspect-ratio: 1 / 1;
  overflow: hidden;
}
.works__item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s ease;
}
.works__item:hover img {
  transform: scale(1.05);
}

/* =========================================================
   設備紹介
   ========================================================= */
.equipment {
  padding: var(--section-pad-pc) var(--pad-pc);
  background-color: var(--color-dark-bg);
}
.equipment__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.equipment__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.equipment__list {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}
.equipment-card img {
  width: 100%;
  height: auto; /* HTML側のwidth/height属性より aspect-ratio を優先させるために明示指定 */
  aspect-ratio: 4 / 3;
  object-fit: cover;
}
.equipment-card__name {
  margin-top: 14px;
  font-size: 13px;
  text-align: center;
  color: var(--color-white);
}

/* =========================================================
   ご依頼の流れ
   ========================================================= */
.flow {
  padding: var(--section-pad-pc) var(--pad-pc);
}
.flow__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}
.flow__list {
  margin-top: 48px;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  align-items: start;
}
.flow-card {
  position: relative;
  text-align: center;
  padding: 0 8px;
}
.flow-card::after {
  content: "";
  position: absolute;
  top: 26px;
  right: -8px;
  width: 16px;
  height: 16px;
  background-image: url("../assets/icons/arrow-right.svg");
  background-repeat: no-repeat;
  background-size: contain;
  opacity: .55;
}
.flow-card:last-child::after {
  display: none;
}
.flow-card__number {
  display: block;
  font-size: 13px;
  font-weight: 700;
  color: #9AA7BC;
  letter-spacing: .05em;
}
.flow-card img {
  margin: 10px auto 0;
}
.flow-card__label {
  margin-top: 14px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
}

/* =========================================================
   お問い合わせCTA
   ========================================================= */
.contact-cta {
  background-color: var(--color-dark-bg);
  padding: 56px var(--pad-pc);
}
.contact-cta__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}
.contact-cta__text {
  color: var(--color-white);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.7;
  flex: 1 1 280px;
}
.contact-cta__info {
  color: var(--color-white);
  flex: 0 0 auto;
}
.contact-cta__tel,
.contact-cta__mail {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
}
.contact-cta__tel img,
.contact-cta__mail img {
  filter: invert(1);
}
.contact-cta__mail {
  font-size: 15px;
  font-weight: 500;
  margin-top: 8px;
}
.contact-cta__hours {
  margin-top: 4px;
  margin-left: 32px;
  font-size: 12px;
  color: #A9B6CB;
}

/* =========================================================
   フッター
   ========================================================= */
.footer {
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  position: relative;
}
.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px var(--pad-pc) 32px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 32px;
}
.footer__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
}
.footer__address {
  margin-top: 14px;
  font-size: 13px;
  color: #4a4a4a;
}
.footer__nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
}
.footer__nav a {
  font-size: 13px;
  color: var(--color-text);
}
.footer__nav a:hover {
  color: var(--color-primary);
}
.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding: 20px var(--pad-pc);
  text-align: center;
}
.footer__bottom p {
  font-size: 12px;
  color: #6b7482;
}

.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background-color: var(--color-primary);
  border: none;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 12px rgba(3, 26, 58, .25);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .25s ease, transform .25s ease, visibility .25s ease;
  z-index: 400;
}
.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.back-to-top img {
  filter: invert(1);
}

/* =========================================================
   タブレット（769〜1024px）
   ========================================================= */
@media (max-width: 1024px) {
  :root {
    --section-pad-pc: 80px;
  }

  .header__inner,
  .hero__inner,
  .about,
  .services,
  .strengths,
  .works,
  .equipment,
  .flow,
  .contact-cta,
  .footer__inner,
  .footer__bottom {
    padding-left: var(--pad-tablet);
    padding-right: var(--pad-tablet);
  }

  .header__nav-list {
    gap: 18px;
  }

  .hero__title {
    font-size: 44px;
  }

  .about__inner {
    gap: 40px;
  }

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

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

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

  .flow__list {
    grid-template-columns: repeat(5, 1fr);
    gap: 4px;
  }
  .flow-card__label {
    font-size: 12px;
  }
}

/* ヘッダーがハンバーガーへ切り替わる境界（ナビが収まらない場合） */
@media (max-width: 900px) {
  .header__menu-btn {
    display: flex;
  }

  .header__nav {
    position: fixed;
    top: var(--header-height);
    right: 0;
    width: min(320px, 84vw);
    height: calc(100vh - var(--header-height));
    background-color: var(--color-white);
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 0;
    padding: 24px;
    transform: translateX(100%);
    transition: transform .28s ease;
    overflow-y: auto;
    box-shadow: -4px 0 16px rgba(3, 26, 58, .12);
  }
  .header__nav.is-open {
    transform: translateX(0);
  }

  .header__nav-list {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    width: 100%;
  }
  .header__nav-list a {
    display: block;
    width: 100%;
    padding: 14px 4px;
    border-bottom: 1px solid var(--color-border);
  }

  .header__cta {
    margin-top: 20px;
    width: 100%;
    text-align: center;
  }

  .header__overlay {
    display: block;
    position: fixed;
    inset: var(--header-height) 0 0 0;
    background-color: rgba(3, 26, 58, .45);
    opacity: 0;
    visibility: hidden;
    transition: opacity .28s ease, visibility .28s ease;
    z-index: 400;
  }
  .header__overlay.is-visible {
    opacity: 1;
    visibility: visible;
  }
}

/* =========================================================
   スマートフォン（768px以下）
   ========================================================= */
@media (max-width: 768px) {
  :root {
    --section-pad-sp: 56px;
  }

  .header__inner,
  .hero__inner,
  .about,
  .services,
  .strengths,
  .works,
  .equipment,
  .flow,
  .contact-cta,
  .footer__inner,
  .footer__bottom {
    padding-left: var(--pad-sp);
    padding-right: var(--pad-sp);
  }

  .about,
  .services,
  .strengths,
  .works,
  .equipment,
  .flow {
    padding-top: var(--section-pad-sp);
    padding-bottom: var(--section-pad-sp);
  }

  .section-title {
    font-size: 22px;
  }

  /* HERO */
  .hero {
    height: 600px;
    max-height: none;
    min-height: 560px;
  }
  .hero__img {
    object-position: 68% center;
  }
  .hero__overlay {
    background: linear-gradient(180deg,
      rgba(3, 26, 58, .35) 0%,
      rgba(3, 26, 58, .55) 45%,
      rgba(3, 26, 58, .92) 78%);
  }
  .hero__inner {
    justify-content: flex-end;
    padding-bottom: 48px;
  }
  .hero__title {
    font-size: 36px;
  }
  .hero__lead {
    margin-top: 20px;
    font-size: 14px;
  }

  /* 私たちについて */
  .about__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .about__media {
    order: 2;
  }
  .about__text {
    order: 1;
  }

  /* 事業内容 */
  .services__list {
    grid-template-columns: 1fr;
  }

  /* 強み */
  .strengths__list {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .strength-card {
    display: flex;
    align-items: center;
    text-align: left;
    gap: 20px;
    padding: 20px;
  }
  .strength-card img {
    flex-shrink: 0;
    margin: 0;
  }

  /* 製作事例 */
  .works__head {
    flex-direction: column;
    align-items: flex-start;
  }
  .works__list {
    grid-template-columns: repeat(2, 1fr);
  }

  /* 設備紹介 */
  .equipment__head {
    flex-direction: column;
    align-items: flex-start;
  }
  .equipment__list {
    grid-template-columns: repeat(2, 1fr);
  }

  /* ご依頼の流れ */
  .flow__list {
    grid-template-columns: 1fr;
    gap: 0;
  }
  .flow-card {
    display: flex;
    align-items: center;
    text-align: left;
    gap: 20px;
    padding: 18px 8px;
    border-bottom: 1px solid var(--color-border);
  }
  .flow-card:last-child {
    border-bottom: none;
  }
  .flow-card img {
    margin: 0;
    flex-shrink: 0;
  }
  .flow-card__label {
    margin-top: 0;
  }
  .flow-card::after {
    content: none;
  }

  /* お問い合わせCTA */
  .contact-cta__inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .contact-cta__info {
    width: 100%;
  }
  .contact-cta__hours {
    margin-left: 32px;
  }

  /* フッター */
  .footer__inner {
    flex-direction: column;
    gap: 24px;
  }

  .back-to-top {
    right: 16px;
    bottom: 16px;
    width: 44px;
    height: 44px;
  }
}