/* =========================
   基本設定
========================= */

/* 余白計算をしやすくする設定 */
* {
  box-sizing: border-box;
}

/* ページ全体の基本デザイン */
body {
  margin: 0;
  font-family: "Helvetica Neue", "Arial", "Noto Sans JP", sans-serif;
  background-color: #111111;
  color: #f5f5f5;
  line-height: 1.8;
}

/* 画像が親要素からはみ出ないようにする */
img {
  max-width: 100%;
  display: block;
}

/* リンクの下線を消す */
a {
  text-decoration: none;
  color: inherit;
}

/* リストの点を消す */
ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

/* 横幅をそろえる共通クラス */
.container {
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
}

/* =========================
   ヘッダー
========================= */

.header {
  width: 100%;
  padding: 24px 0;
  background-color: rgba(17, 17, 17, 0.9);
  position: fixed;
  top: 0;
  left: 0;
  z-index: 10;
}

.header-inner {
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
  display: flex;  /* ロゴとナビを横並びにする */
  justify-content: space-between;
  align-items: center;
}

.logo {
  margin: 0;
  font-size: 24px;
  letter-spacing: 0.18em;
  font-weight: 400;
}

.nav ul {
  display: flex;
  gap: 32px;
}

.nav a {
  font-size: 13px;
  color: #cfcfcf;
  letter-spacing: 0.08em;
  transition: 0.3s;
}

.nav a:hover {
  color: #ffffff;
}

/* =========================
   ファーストビュー
========================= */

.hero {
  min-height: 100vh;
  padding-top: 120px;

  /* 黒背景に少しだけ光を入れる */
  background:
    radial-gradient(circle at 75% 45%, rgba(255,255,255,0.14), transparent 28%),
    linear-gradient(135deg, #111111, #1b1b1b);
}

.hero-inner {
  width: 90%;
  max-width: 1100px;
  min-height: calc(100vh - 120px);
  margin: 0 auto;

  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 60px;
}

.hero-text {
  width: 50%;
}

.hero-label,
.section-label {
  color: #a8a8a8;
  font-size: 13px;
  letter-spacing: 0.22em;
  margin-bottom: 16px;
}

.hero h2 {
  font-size: 64px;
  line-height: 1.25;
  font-weight: 500;
  margin: 0 0 28px;
}

.hero-copy {
  color: #c7c7c7;
  font-size: 16px;
  margin-bottom: 36px;
}

/* ボタン共通 */
.btn {
  display: inline-block;
  padding: 14px 36px;
  background-color: #f5f5f5;
  color: #111111;
  border: 1px solid #f5f5f5;
  border-radius: 999px;
  font-size: 14px;
  letter-spacing: 0.08em;
  transition: 0.3s;
}

.btn:hover {
  background-color: transparent;
  color: #f5f5f5;
}

/* 右側の画像エリア */
.hero-visual {
  width: 48%;
  overflow: hidden;  /* 画像がはみ出さないようにする */
  border-radius: 32px;
}

.hero-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.08);  /* 少し拡大 */
  display: block;

  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

/* =========================
   共通セクション
========================= */

.section {
  padding: 120px 0;
}

.section-title {
  font-size: 38px;
  line-height: 1.4;
  font-weight: 500;
  margin: 0 0 48px;
}

/* =========================
   悩みセクション
========================= */

.problem {
  background-color: #181818;
}

.problem-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);  /* 4つのカードを横並び */
  gap: 20px;
}

.problem-card {
  padding: 32px 20px;
  background-color: #222222;
  border: 1px solid #333333;
  border-radius: 20px;
  text-align: center;
  color: #e5e5e5;
}

/* =========================
   コンセプト
========================= */

.concept-inner {
  display: flex;
  align-items: center;
  gap: 80px;
}

.concept-text {
  width: 55%;
}

.concept-text p {
  color: #c7c7c7;
}

.concept-box {
  width: 45%;
  height: 360px;
  background: linear-gradient(145deg, #202020, #111111);
  border: 1px solid #333333;
  border-radius: 28px;

  display: flex;
  align-items: center;
  justify-content: center;
}

.concept-box p {
  font-size: 26px;
  letter-spacing: 0.25em;
  text-align: center;
  color: #f5f5f5;
}

/* =========================
   特徴
========================= */

.feature {
  background-color: #111111;
}

.feature-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.feature-card {
  padding: 40px 32px;
  background-color: #1b1b1b;
  border-radius: 24px;
  border: 1px solid #333333;
}

.feature-card span {
  display: block;
  font-size: 42px;
  color: #555555;
  margin-bottom: 24px;
}

.feature-card h3 {
  font-size: 22px;
  margin: 0 0 16px;
}

.feature-card p {
  color: #bdbdbd;
  font-size: 15px;
}

/* =========================
   商品紹介
========================= */

.product {
  background-color: #181818;
}

.product-inner {
  display: flex;
  align-items: center;
  gap: 70px;
}

.product-visual,
.product-text {
  width: 50%;
}

.product-visual {
  width: 50%;
  overflow: hidden;  /* 画像がはみ出ないようにする */
  border-radius: 32px;
}

.product-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;  /* 画像を枠いっぱいに表示 */
  display: block;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.product-text p {
  color: #c7c7c7;
}

.btn-dark {
  margin-top: 24px;
}

/* =========================
   お客様の声
========================= */

.voice {
  background-color: #111111;
}

.voice-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.voice-card {
  padding: 36px 28px;
  background-color: #1b1b1b;
  border: 1px solid #333333;
  border-radius: 22px;
}

.voice-card p {
  font-size: 17px;
  margin: 0 0 24px;
}

.voice-card span {
  color: #a8a8a8;
  font-size: 14px;
}

/* =========================
   CTA
========================= */

.cta {
  padding: 120px 0;
  text-align: center;
  background:
    radial-gradient(circle at center, rgba(255,255,255,0.12), transparent 35%),
    #181818;
}

.cta h2 {
  font-size: 42px;
  font-weight: 500;
  margin: 0 0 20px;
}

.cta p {
  color: #c7c7c7;
  margin-bottom: 36px;
}

/* =========================
   フッター
========================= */

.footer {
  padding: 32px 0;
  text-align: center;
  background-color: #0b0b0b;
}

.footer p {
  margin: 0;
  font-size: 13px;
  color: #777777;
}

/* =========================
   スマホ対応
========================= */

@media (max-width: 768px) {

  .header {
    padding: 18px 0;
  }

  .header-inner {
    flex-direction: column;
    gap: 16px;
  }

  .nav ul {
    gap: 18px;
    flex-wrap: wrap;
    justify-content: center;
  }

  .hero-inner {
    flex-direction: column;
    padding: 70px 0;
    text-align: center;
  }

  .hero-text,
  .hero-visual {
    width: 100%;
  }

  .hero h2 {
    font-size: 42px;
  }

  .hero-visual {
    min-height: 320px;
  }

  .section {
    padding: 80px 0;
  }

  .section-title {
    font-size: 30px;
  }

  .problem-list,
  .feature-list,
  .voice-list {
    grid-template-columns: 1fr;
  }

  .concept-inner,
  .product-inner {
    flex-direction: column;
  }

  .concept-text,
  .concept-box,
  .product-visual,
  .product-text {
    width: 100%;
  }

  .cta h2 {
    font-size: 32px;
  }
}