/* =========================================================
   おうち書道 受講者専用ポータル — 共通スタイル
   student_*.html すべてから読み込みます。
   ブランドカラーは index_v2_visual.html B案「柿渋」に準拠。
   ========================================================= */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --color-ink:    #1a1a1a;
  --color-main:   #2c1a0e;   /* 古材黒 */
  --color-sub:    #4a3728;   /* 墨茶 */
  --color-cta:    #7c2d12;   /* 柿渋（最重要CTA） */
  --color-accent: #8b6914;   /* 金茶（補助CTA） */
  --color-light:  #f7f2e8;   /* 和紙 */
  --color-light2: #ede5d5;   /* 古紙（カード背景） */
  --color-border: #ddd5c5;
  --color-gray:   #666;
  --color-ok:     #2e6b3e;   /* 良い例（緑） */
  --color-ng:     #a3372f;   /* 悪い例（赤） */
  --font-serif:   'Noto Serif JP', '游明朝', 'YuMincho', serif;
  --font-sans:    'Noto Sans JP', 'Yu Gothic', sans-serif;
  --max-w:        900px;
}

body {
  font-family: var(--font-sans);
  color: var(--color-ink);
  background: var(--color-light);
  line-height: 1.85;
  font-size: 16px;
}

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

/* ===== HEADER ===== */
.s-header {
  position: sticky; top: 0; z-index: 100;
  background: var(--color-main);
  padding: 14px 20px;
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 8px;
}
.s-header__logo {
  font-family: var(--font-serif);
  color: #fff; font-size: 0.95rem; letter-spacing: 0.12em;
}
.s-header__back {
  color: rgba(255,255,255,0.75); font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-decoration: none;
}
.s-header__back:hover { color: #fff; }

/* ===== CONTAINER ===== */
.s-container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== BREADCRUMB ===== */
.s-breadcrumb {
  font-size: 0.78rem;
  color: var(--color-gray);
  padding: 16px 0 0;
  letter-spacing: 0.04em;
}
.s-breadcrumb a { color: var(--color-sub); text-decoration: underline; }
.s-breadcrumb a:hover { color: var(--color-cta); }
.s-breadcrumb__sep { margin: 0 6px; color: var(--color-border); }

/* ===== HERO (ページ見出し) ===== */
.s-hero {
  padding: 28px 0 24px;
}
.s-hero__label {
  font-size: 0.65rem; letter-spacing: 0.28em;
  color: var(--color-gray); margin-bottom: 10px;
}
.s-hero__title {
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 5vw, 2rem);
  font-weight: 700; color: var(--color-main);
  letter-spacing: 0.06em;
  line-height: 1.4;
}
.s-hero__desc {
  margin-top: 12px;
  font-size: 0.95rem;
  color: #444;
  max-width: 640px;
}

/* ===== SECTION ===== */
.s-section { padding: 24px 0 40px; }
.s-section__title {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-main);
  letter-spacing: 0.06em;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--color-main);
  margin-bottom: 20px;
}

/* ===== CARD GRID（受講者ガイド トップ用） ===== */
.s-card-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 8px;
}
.s-card {
  display: flex; flex-direction: column;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 24px 20px;
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.2s, transform 0.15s, border-color 0.2s;
  min-height: 120px;
}
.s-card:hover {
  box-shadow: 0 6px 24px rgba(44,26,14,0.10);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}
.s-card__icon {
  font-size: 1.8rem;
  margin-bottom: 10px;
}
.s-card__title {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-main);
  letter-spacing: 0.04em;
  margin-bottom: 6px;
}
.s-card__desc {
  font-size: 0.8rem;
  color: var(--color-gray);
  line-height: 1.7;
}

/* ===== 今月の教材（強調ボックス） ===== */
.s-monthly-box {
  background: var(--color-main);
  color: #fff;
  border-radius: 6px;
  padding: 28px 24px;
  margin-bottom: 28px;
}
.s-monthly-box__label {
  font-size: 0.65rem; letter-spacing: 0.26em;
  color: rgba(255,255,255,0.55);
  margin-bottom: 8px;
}
.s-monthly-box__title {
  font-family: var(--font-serif);
  font-size: 1.2rem; font-weight: 700;
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}
.s-monthly-box .btn {
  margin-top: 4px;
}

/* ===== 情報リスト（教材リンク等） ===== */
.s-info-list {
  list-style: none;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow: hidden;
}
.s-info-list li {
  display: flex; flex-wrap: wrap;
  align-items: center; justify-content: space-between;
  gap: 8px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--color-border);
}
.s-info-list li:last-child { border-bottom: none; }
.s-info-list__label {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--color-main);
}
.s-info-list__note {
  display: block;
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--color-gray);
  margin-top: 4px;
}

/* ===== チェックリスト ===== */
.s-checklist {
  list-style: none;
  display: flex; flex-direction: column; gap: 10px;
}
.s-checklist li {
  display: flex; align-items: flex-start; gap: 12px;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 14px 16px;
  font-size: 0.92rem;
}
.s-checklist__icon {
  flex-shrink: 0;
  width: 26px; height: 26px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
}
.s-checklist__icon--ok { background: #e6f0e8; color: var(--color-ok); }
.s-checklist__icon--ng { background: #f7e8e6; color: var(--color-ng); }

/* ===== 画像枠（良い例・悪い例プレースホルダー） ===== */
.s-photo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 16px 0 8px;
}
.s-photo-frame {
  aspect-ratio: 4 / 3;
  border: 2px dashed var(--color-border);
  border-radius: 6px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 8px;
  background: var(--color-light2);
  text-align: center;
  padding: 12px;
}
.s-photo-frame__tag {
  font-size: 0.7rem; font-weight: 700;
  letter-spacing: 0.1em;
  padding: 3px 12px; border-radius: 20px;
}
.s-photo-frame__tag--ok { background: #e6f0e8; color: var(--color-ok); }
.s-photo-frame__tag--ng { background: #f7e8e6; color: var(--color-ng); }
.s-photo-frame__text {
  font-size: 0.75rem; color: var(--color-gray);
}

/* ===== Q&A（FAQ アコーディオン） ===== */
.s-faq {
  display: flex; flex-direction: column; gap: 10px;
}
.s-faq__item {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 6px;
  overflow: hidden;
}
.s-faq__q {
  display: flex; align-items: center; gap: 12px;
  width: 100%;
  text-align: left;
  padding: 16px 18px;
  background: none; border: none;
  font-family: var(--font-sans);
  font-size: 0.95rem; font-weight: 700;
  color: var(--color-main);
  cursor: pointer;
}
.s-faq__q::before {
  content: 'Q';
  flex-shrink: 0;
  width: 28px; height: 28px;
  background: var(--color-accent); color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-serif); font-size: 0.85rem;
}
.s-faq__q::after {
  content: '+';
  margin-left: auto;
  font-size: 1.3rem; color: var(--color-gray);
  transition: transform 0.2s;
}
.s-faq__item[open] .s-faq__q::after { transform: rotate(45deg); }
.s-faq__a {
  display: flex; gap: 12px;
  padding: 0 18px 18px 18px;
  font-size: 0.88rem; color: #444;
}
.s-faq__a::before {
  content: 'A';
  flex-shrink: 0;
  width: 28px; height: 28px;
  background: var(--color-light2); color: var(--color-main);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-serif); font-size: 0.85rem; font-weight: 700;
}

/* ===== ボタン ===== */
.btn {
  display: inline-block;
  padding: 16px 36px;
  border-radius: 4px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  cursor: pointer;
  text-decoration: none;
  border: none;
  transition: background 0.2s, transform 0.15s, opacity 0.2s;
  text-align: center;
}
.btn--cta { background: var(--color-cta); color: #fff; }
.btn--cta:hover { background: #6a2510; transform: translateY(-1px); }
.btn--sub { background: var(--color-sub); color: #fff; }
.btn--sub:hover { background: #3a2a1c; transform: translateY(-1px); }
.btn--gold { background: var(--color-accent); color: #fff; }
.btn--gold:hover { background: #755910; transform: translateY(-1px); }
.btn--outline {
  background: transparent; color: var(--color-main);
  border: 2px solid var(--color-main);
}
.btn--outline:hover { background: var(--color-main); color: #fff; }
.btn--block { display: block; width: 100%; }
.btn--lg { padding: 20px 40px; font-size: 1.05rem; }

/* ===== フォーム ===== */
.s-form-group { margin-bottom: 22px; }
.s-form-group label {
  display: block;
  font-size: 0.92rem; font-weight: 700;
  color: var(--color-main);
  margin-bottom: 8px;
}
.s-form-group label .required {
  color: var(--color-cta);
  font-size: 0.7rem;
  font-weight: 700;
  border: 1px solid var(--color-cta);
  border-radius: 3px;
  padding: 1px 6px;
  margin-left: 8px;
  letter-spacing: 0.05em;
}
.s-form-group label .optional {
  color: var(--color-gray);
  font-size: 0.7rem;
  font-weight: 400;
  border: 1px solid var(--color-border);
  border-radius: 3px;
  padding: 1px 6px;
  margin-left: 8px;
  letter-spacing: 0.05em;
}
.s-form-group input[type="text"],
.s-form-group input[type="email"],
.s-form-group input[type="tel"],
.s-form-group input[type="date"],
.s-form-group select,
.s-form-group textarea {
  width: 100%;
  padding: 14px 16px;
  font-size: 1rem;
  font-family: var(--font-sans);
  color: var(--color-ink);
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: 4px;
}
.s-form-group input:focus,
.s-form-group select:focus,
.s-form-group textarea:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}
.s-form-group textarea { resize: vertical; min-height: 140px; }
.s-form-group__hint {
  font-size: 0.78rem; color: var(--color-gray);
  margin-top: 6px;
}
.s-form-fieldset {
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 20px;
  margin-bottom: 24px;
  background: var(--color-light2);
}
.s-form-fieldset legend {
  font-family: var(--font-serif);
  font-size: 0.95rem; font-weight: 700;
  color: var(--color-main);
  padding: 0 8px;
}

/* ===== 注意書きボックス ===== */
.s-note-box {
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--color-light2);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: 4px;
  padding: 16px 18px;
  font-size: 0.85rem;
  color: var(--color-sub);
  margin-bottom: 16px;
}
.s-note-box__icon { flex-shrink: 0; font-size: 1.1rem; }
.s-note-box ul { padding-left: 1.2em; margin-top: 4px; }

/* ===== 戻るボタン（下層ページ下部） ===== */
.s-return {
  padding: 8px 0 56px;
  text-align: center;
}

/* ===== フッター ===== */
.s-footer {
  background: var(--color-main);
  color: rgba(255,255,255,0.5);
  text-align: center;
  font-size: 0.72rem;
  padding: 28px 20px;
  letter-spacing: 0.06em;
}
.s-footer a {
  color: rgba(255,255,255,0.75);
  text-decoration: underline;
  margin: 0 8px;
}

/* ===== レスポンシブ ===== */
@media (max-width: 640px) {
  .s-card-grid { grid-template-columns: 1fr; }
  .s-photo-grid { grid-template-columns: 1fr; }
  .btn--block-mobile { display: block; width: 100%; text-align: center; }

  /* 情報リスト：スマホでは縦並びにし、ボタンは横幅いっぱいでタップしやすく */
  .s-info-list li { flex-direction: column; align-items: stretch; }
  .s-info-list li > .btn { display: block; width: 100%; text-align: center; margin-top: 4px; }

  /* 小さすぎる注釈・補足文字をやや拡大（高齢の受講者にも読みやすく） */
  .s-info-list__note,
  .s-card__desc,
  .s-faq__a,
  .s-checklist li,
  .s-form-group__hint,
  .s-breadcrumb,
  .login-notes {
    font-size: 0.85rem;
  }
  .s-footer { font-size: 0.78rem; }

  /* ボタンの左右余白をスマホ向けに調整（はみ出し防止・タップ領域確保） */
  .btn { padding: 16px 24px; }
  .btn--lg { padding: 18px 28px; }
}