/* ============================================
   選ばれる理由・強みセクション (F-007)
   株式会社PHOSS コーポレートサイト
   ============================================ */

/* ----------------------------------------
   セクションベース
   ---------------------------------------- */
.strengths {
  background-color: var(--color-white);
  padding-block: var(--space-24);
  position: relative;
  overflow: hidden;
}

/* 背景装飾 */
.strengths::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--color-primary-700),
    var(--color-accent-500),
    var(--color-primary-400)
  );
}

/* ----------------------------------------
   セクションヘッダー
   ---------------------------------------- */
.strengths__header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.strengths__label {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-widest);
  text-transform: uppercase;
  color: var(--color-accent-500);
  margin-bottom: var(--space-3);
}

.strengths__title {
  font-size: clamp(var(--font-size-xl), 3.5vw, var(--font-size-3xl));
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  line-height: var(--line-height-snug);
  margin-bottom: var(--space-4);
}

.strengths__subtitle {
  font-size: var(--font-size-md);
  color: var(--text-secondary);
  max-width: 560px;
  margin-inline: auto;
  line-height: var(--line-height-relaxed);
  margin-bottom: var(--space-4);
}

.strengths__divider {
  width: 60px;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--color-accent-500),
    var(--color-primary-300)
  );
  border-radius: var(--radius-full);
  margin-inline: auto;
}

/* ----------------------------------------
   強みカードグリッド
   ---------------------------------------- */
.strengths__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-16);
}

/* 5枚目のカードを中央寄せ（3カラムグリッドで最終行に1つ残る場合） */
.strengths__grid .strength-card:nth-child(4) {
  grid-column: 1;
}

.strengths__grid .strength-card:nth-child(5) {
  grid-column: 2;
}

/* ----------------------------------------
   強みカード
   ---------------------------------------- */
.strength-card {
  background-color: var(--color-white);
  border: 1px solid var(--border-color-base);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-4);
  box-shadow: var(--shadow-sm);
  transition:
    box-shadow var(--transition-base),
    transform var(--transition-base),
    border-color var(--transition-base);
  position: relative;
  overflow: hidden;

  /* スクロールアニメーション初期状態 */
  opacity: 0;
  transform: translateY(24px);
}

/* スクロールアニメーション: 表示 */
.strength-card.is-animated {
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease,
    box-shadow var(--transition-base),
    border-color var(--transition-base);
}

/* ホバー効果 */
.strength-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-6px);
  border-color: var(--color-primary-200);
}

.strength-card.is-animated:hover {
  transform: translateY(-6px);
}

/* カード左上の装飾ライン */
.strength-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(
    90deg,
    var(--color-accent-500),
    var(--color-primary-300)
  );
  border-radius: 0 var(--radius-full) var(--radius-full) 0;
  transition: width var(--transition-slow);
}

.strength-card:hover::before {
  width: 100%;
}

/* ----------------------------------------
   強みカード: アイコンエリア
   ---------------------------------------- */
.strength-card__icon-wrap {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-lg);
  background: linear-gradient(
    135deg,
    var(--color-primary-50) 0%,
    rgba(0, 144, 232, 0.10) 100%
  );
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--transition-base), transform var(--transition-spring);
}

.strength-card__icon-wrap svg {
  width: 28px;
  height: 28px;
  color: var(--color-accent-500);
  transition: color var(--transition-base);
}

.strength-card:hover .strength-card__icon-wrap {
  background: linear-gradient(
    135deg,
    rgba(0, 144, 232, 0.15) 0%,
    rgba(0, 144, 232, 0.25) 100%
  );
  transform: scale(1.05);
}

.strength-card:hover .strength-card__icon-wrap svg {
  color: var(--color-primary-500);
}

/* ----------------------------------------
   強みカード: テキストエリア
   ---------------------------------------- */
.strength-card__body {
  flex: 1;
  min-width: 0;
}

.strength-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  line-height: var(--line-height-snug);
}

.strength-card__desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: var(--line-height-relaxed);
  margin: 0;
}

/* ----------------------------------------
   実績数値バー（セクション最下部）
   ---------------------------------------- */
.strengths__numbers {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  background: linear-gradient(
    135deg,
    var(--color-primary-900) 0%,
    var(--color-primary-800) 50%,
    var(--color-primary-700) 100%
  );
  border-radius: var(--radius-2xl);
  overflow: hidden;
  position: relative;
}

/* 区切り線 */
.strengths__numbers .strength-number:not(:last-child) {
  border-right: 1px solid rgba(255, 255, 255, 0.10);
}

.strength-number {
  padding: var(--space-8) var(--space-6);
  text-align: center;
  position: relative;

  opacity: 0;
  transform: translateY(16px);
}

.strength-number.is-animated {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.strength-number__value {
  display: block;
  font-size: clamp(var(--font-size-2xl), 4vw, var(--font-size-4xl));
  font-weight: var(--font-weight-black);
  color: var(--color-white);
  line-height: 1;
  margin-bottom: var(--space-1);
}

.strength-number__value span {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent-300);
}

.strength-number__label {
  font-size: var(--font-size-xs);
  color: rgba(255, 255, 255, 0.55);
  letter-spacing: var(--letter-spacing-wider);
  line-height: var(--line-height-relaxed);
}

/* ----------------------------------------
   アニメーション遅延（カードを順番に出現）
   ---------------------------------------- */
.strength-card:nth-child(1) { transition-delay: 0.05s; }
.strength-card:nth-child(2) { transition-delay: 0.12s; }
.strength-card:nth-child(3) { transition-delay: 0.19s; }
.strength-card:nth-child(4) { transition-delay: 0.26s; }
.strength-card:nth-child(5) { transition-delay: 0.33s; }

.strength-card.is-animated:nth-child(1) { transition-delay: 0.05s; }
.strength-card.is-animated:nth-child(2) { transition-delay: 0.12s; }
.strength-card.is-animated:nth-child(3) { transition-delay: 0.19s; }
.strength-card.is-animated:nth-child(4) { transition-delay: 0.26s; }
.strength-card.is-animated:nth-child(5) { transition-delay: 0.33s; }

.strength-number:nth-child(1) { transition-delay: 0.10s; }
.strength-number:nth-child(2) { transition-delay: 0.18s; }
.strength-number:nth-child(3) { transition-delay: 0.26s; }
.strength-number:nth-child(4) { transition-delay: 0.34s; }

.strength-number.is-animated:nth-child(1) { transition-delay: 0.10s; }
.strength-number.is-animated:nth-child(2) { transition-delay: 0.18s; }
.strength-number.is-animated:nth-child(3) { transition-delay: 0.26s; }
.strength-number.is-animated:nth-child(4) { transition-delay: 0.34s; }

/* ----------------------------------------
   prefers-reduced-motion
   ---------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  .strength-card,
  .strength-number {
    opacity: 1;
    transform: none;
    transition: box-shadow var(--transition-base),
                border-color var(--transition-base);
  }

  .strength-card.is-animated,
  .strength-number.is-animated {
    transition: box-shadow var(--transition-base),
                border-color var(--transition-base);
  }

  .strength-card:hover,
  .strength-card.is-animated:hover {
    transform: none;
  }

  .strength-card::before {
    width: 0;
    transition: none;
  }

  .strength-card:hover::before {
    width: 0;
  }
}

/* ----------------------------------------
   レスポンシブ: タブレット（768px〜1023px）
   ---------------------------------------- */
@media (min-width: 768px) and (max-width: 1023px) {
  .strengths {
    padding-block: var(--space-16);
  }

  .strengths__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-5);
  }

  /* タブレットでは5枚目を2カラムに戻す */
  .strengths__grid .strength-card:nth-child(4) {
    grid-column: auto;
  }

  .strengths__grid .strength-card:nth-child(5) {
    grid-column: auto;
  }

  .strengths__title {
    font-size: var(--font-size-2xl);
  }

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

  .strengths__numbers .strength-number:nth-child(2) {
    border-right: none;
  }

  .strengths__numbers .strength-number:nth-child(1),
  .strengths__numbers .strength-number:nth-child(2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.10);
  }
}

/* ----------------------------------------
   レスポンシブ: スマートフォン（〜767px）
   ---------------------------------------- */
@media (max-width: 767px) {
  .strengths {
    padding-block: var(--space-12);
  }

  .strengths__header {
    margin-bottom: var(--space-10);
  }

  .strengths__title {
    font-size: var(--font-size-xl);
  }

  .strengths__subtitle {
    font-size: var(--font-size-base);
  }

  .strengths__grid {
    grid-template-columns: 1fr;
    gap: var(--space-4);
    margin-bottom: var(--space-10);
  }

  /* SP: nth-child 位置指定をリセット */
  .strengths__grid .strength-card:nth-child(4),
  .strengths__grid .strength-card:nth-child(5) {
    grid-column: auto;
  }

  .strength-card {
    padding: var(--space-6);
  }

  .strength-card__icon-wrap {
    width: 48px;
    height: 48px;
  }

  .strength-card__icon-wrap svg {
    width: 24px;
    height: 24px;
  }

  .strength-card__title {
    font-size: var(--font-size-base);
  }

  .strengths__numbers {
    grid-template-columns: repeat(2, 1fr);
    border-radius: var(--radius-xl);
  }

  .strengths__numbers .strength-number:not(:last-child) {
    border-right: none;
  }

  .strengths__numbers .strength-number:nth-child(1),
  .strengths__numbers .strength-number:nth-child(2) {
    border-bottom: 1px solid rgba(255, 255, 255, 0.10);
  }

  .strengths__numbers .strength-number:nth-child(1),
  .strengths__numbers .strength-number:nth-child(3) {
    border-right: 1px solid rgba(255, 255, 255, 0.10);
  }

  .strength-number {
    padding: var(--space-6) var(--space-4);
  }

  .strength-number__value {
    font-size: var(--font-size-2xl);
  }
}