/* ============================================================
   kosen-faq.css — 高専生向けFAQ（ライト off-white）
   5問アコーディオン / ゴールドQバッジ / careers-faqと同構造
   ============================================================ */

/* --- Section --- */
.kosen-faq {
  position: relative;
  z-index: var(--z-content, 10);
  padding: 100px 0;
  background: var(--c-bg-section, #F7F8FA);
}

/* --- Container --- */
.kosen-faq__container {
  max-width: var(--s-container, 1200px);
  margin: 0 auto;
  padding: 0 var(--s-gutter, 32px);
}

/* --- Header --- */
.kosen-faq__header {
  margin-bottom: 64px;
}

.kosen-faq__eyebrow {
  display: inline-block;
  font-family: var(--f-label, 'Inter', sans-serif);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--c-gold);
  margin-bottom: 16px;
}

.kosen-faq__title {
  font-family: var(--f-heading-ja, 'Noto Serif JP', serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--c-text, #1A1A1A);
  margin: 0 0 16px;
  line-height: 1.4;
}

.kosen-faq__subtitle {
  font-family: var(--f-body, 'Noto Sans JP', sans-serif);
  font-size: 1rem;
  color: var(--c-text-light, #555555);
  line-height: 1.8;
  margin: 0;
}

/* --- Accordion List --- */
.kosen-faq__list {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* --- Accordion Item --- */
.kosen-faq__item {
  background: var(--c-bg, #FFFFFF);
  border-radius: 12px;
  border: 1px solid var(--c-border-light, #F0F0F0);
  overflow: hidden;
  transition: box-shadow var(--t-base, 0.4s) var(--ease-smooth);
}

.kosen-faq__item:hover {
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
}

.kosen-faq__item.is-open {
  border-color: rgba(201, 168, 76, 0.3);
  box-shadow: 0 4px 20px rgba(201, 168, 76, 0.08);
}

/* --- Question Button --- */
.kosen-faq__question {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 100%;
  padding: 24px 28px;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  transition: background var(--t-base, 0.4s) var(--ease-smooth);
}

.kosen-faq__question:hover {
  background: rgba(201, 168, 76, 0.04);
}

.kosen-faq__question:focus-visible {
  outline: 2px solid var(--c-gold);
  outline-offset: -2px;
  border-radius: 12px;
}

/* --- Q Badge --- */
.kosen-faq__q-badge {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--c-gold), var(--c-gold-light));
  color: #FFFFFF;
  font-family: var(--f-label, 'Inter', sans-serif);
  font-size: 0.9rem;
  font-weight: 700;
  flex-shrink: 0;
  letter-spacing: 0.02em;
}

/* --- Q Text --- */
.kosen-faq__q-text {
  flex: 1;
  font-family: var(--f-body, 'Noto Sans JP', sans-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--c-text, #1A1A1A);
  line-height: 1.5;
}

/* --- Toggle Icon --- */
.kosen-faq__toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  color: var(--c-text-muted, #999999);
  transition: transform var(--t-base, 0.4s) var(--ease-out),
              color var(--t-base, 0.4s) var(--ease-smooth);
}

.kosen-faq__item.is-open .kosen-faq__toggle {
  transform: rotate(180deg);
  color: var(--c-gold);
}

/* --- Answer Panel --- */
.kosen-faq__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.45s var(--ease-out);
}

.kosen-faq__answer:not([hidden]) {
  /* max-height is set via JS */
}

.kosen-faq__answer[hidden] {
  display: block; /* override hidden to allow CSS animation */
  max-height: 0;
  visibility: hidden;
}

.kosen-faq__answer-inner {
  padding: 0 28px 24px 80px; /* align with Q text (28 left + 36 badge + 16 gap) */
}

.kosen-faq__a-text {
  font-family: var(--f-body, 'Noto Sans JP', sans-serif);
  font-size: 0.95rem;
  color: var(--c-text-light, #555555);
  line-height: 1.9;
  margin: 0;
  padding-top: 4px;
  border-top: 1px solid var(--c-border-light, #F0F0F0);
}

/* --- Reveal Animation (delay only — .rv base in base.css) --- */
.kosen-faq .d1 { transition-delay: 0.08s; }
.kosen-faq .d2 { transition-delay: 0.16s; }
.kosen-faq .d3 { transition-delay: 0.24s; }
.kosen-faq .d4 { transition-delay: 0.32s; }
.kosen-faq .d5 { transition-delay: 0.40s; }

/* ============================================================
   Responsive
   ============================================================ */

/* --- Tablet (768px) --- */
@media (max-width: 768px) {
  .kosen-faq {
    padding: 72px 0;
  }

  .kosen-faq__header {
    margin-bottom: 48px;
  }

  .kosen-faq__question {
    padding: 20px 20px;
    gap: 12px;
  }

  .kosen-faq__q-badge {
    width: 32px;
    height: 32px;
    font-size: 0.8rem;
  }

  .kosen-faq__q-text {
    font-size: 0.95rem;
  }

  .kosen-faq__answer-inner {
    padding: 0 20px 20px 64px; /* 20 left + 32 badge + 12 gap */
  }

  .kosen-faq__a-text {
    font-size: 0.9rem;
  }
}

/* --- Mobile (480px) --- */
@media (max-width: 480px) {
  .kosen-faq {
    padding: 56px 0;
  }

  .kosen-faq__container {
    padding: 0 20px;
  }

  .kosen-faq__header {
    margin-bottom: 36px;
  }

  .kosen-faq__list {
    gap: 8px;
  }

  .kosen-faq__item {
    border-radius: 8px;
  }

  .kosen-faq__question {
    padding: 16px 16px;
    gap: 12px;
  }

  .kosen-faq__q-badge {
    width: 28px;
    height: 28px;
    font-size: 0.75rem;
  }

  .kosen-faq__q-text {
    font-size: 0.9rem;
  }

  .kosen-faq__toggle {
    width: 24px;
    height: 24px;
    font-size: 0.8rem;
  }

  .kosen-faq__answer-inner {
    padding: 0 16px 16px 56px; /* 16 left + 28 badge + 12 gap */
  }

  .kosen-faq__a-text {
    font-size: 0.85rem;
    line-height: 1.8;
  }
}