/* ============================================================
   生徒・受講管理システム モック共通スタイル
   デザイン規約: 標準A(コーポレート・落ち着いた、紺×グレー基調)
   丸み・ピル型ボタン等のシェイプは標準Bの柔らかい形状を踏襲
   ============================================================ */
:root {
  --color-bg: #f5f6f8;
  --color-surface: #ffffff;
  --color-primary: #1f3a5f;
  --color-primary-hover: #17304d;
  --color-accent: #3d7ab8;
  --color-text: #1a1a1a;
  --color-text-muted: #5a6472;
  --color-border: #c7ccd3;
  --color-border-light: #e1e4e8;
  --color-border-strong: #b7c0cc;
  --color-danger: #b3261e;
  --color-success: #1e7b4d;
  --color-sidebar-bg: #383c40;
  --color-sidebar-bg-active: #2d3033;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --shadow-card: 0 3px 14px rgba(31, 58, 95, 0.07);
  --font-family: "Segoe UI", "Noto Sans JP", "Hiragino Sans", "Meiryo", sans-serif;
  --sidebar-width: 220px;
  --topbar-height: 56px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
  font-size: 14px;
  word-break: keep-all;
  overflow-wrap: break-word;
}

h1 { font-size: 24px; font-weight: 700; margin: 0 0 var(--space-2); }
h2 { font-size: 18px; font-weight: 700; margin: 0 0 var(--space-2); }
p { margin: 0 0 var(--space-2); }

a { color: var(--color-accent); }
a.btn { text-decoration: none; }

/* ---------- レイアウト: アプリシェル ---------- */
.app-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--color-sidebar-bg);
  color: #fff;
  display: flex;
  flex-direction: column;
}

.sidebar__brand {
  padding: var(--space-2) var(--space-2);
  font-size: 16px;
  font-weight: 700;
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  letter-spacing: 0.02em;
}

.sidebar__nav {
  flex: 1;
  padding: var(--space-2) 0;
}

.sidebar__link {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  margin: 2px 10px;
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
  font-size: 14px;
  border-radius: var(--radius-sm);
}

.sidebar__link:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
}

.sidebar__link.is-active {
  background: var(--color-accent);
  color: #fff;
  font-weight: 700;
}

.sidebar__icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.sidebar__icon svg { width: 100%; height: 100%; }

.sidebar__footer {
  padding: var(--space-2);
  font-size: 12px;
  color: rgba(255, 255, 255, 0.55);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  height: var(--topbar-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-3);
  flex-shrink: 0;
}

.topbar__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-text);
}

.topbar__user {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 13px;
  color: var(--color-text-muted);
}

.topbar__avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-accent);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
}

.content {
  padding: var(--space-3);
  flex: 1;
}

.page-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: var(--space-3);
  gap: var(--space-2);
  flex-wrap: wrap;
}

.page-header__text p {
  margin: 4px 0 0;
  color: var(--color-text-muted);
  font-size: 13px;
}

.breadcrumb {
  font-size: 12px;
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}
.breadcrumb a { color: var(--color-text-muted); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

/* ---------- カード ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border-light);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: var(--space-3);
}

.card + .card { margin-top: var(--space-3); }

.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-2);
}

@media (max-width: 960px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
}

/* ---------- ボタン ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  font-size: 14px;
  font-weight: 700;
  border: 1px solid transparent;
  background: var(--color-surface);
  color: var(--color-text);
  cursor: pointer;
  white-space: nowrap;
  font-family: inherit;
}
.btn--primary { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-hover); border-color: var(--color-primary-hover); }
.btn--secondary { background: transparent; border-color: var(--color-primary); color: var(--color-primary); }
.btn--secondary:hover { background: rgba(31, 58, 95, 0.06); }
.btn--danger { background: transparent; border-color: var(--color-danger); color: var(--color-danger); }
.btn--danger:hover { background: rgba(179, 38, 30, 0.06); }
.btn--sm { padding: 5px 12px; font-size: 12px; }
.btn-row { display: flex; gap: var(--space-1); justify-content: flex-end; margin-top: var(--space-3); }
.btn-row--split { justify-content: space-between; }

/* ---------- フォーム ---------- */
label { display: block; margin-bottom: 4px; font-weight: 600; font-size: 13px; }
.required::after { content: " *"; color: var(--color-danger); font-weight: 700; }

input, select, textarea {
  width: 100%;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--color-text);
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 2px rgba(61, 122, 184, 0.3);
}
input::placeholder { color: #9aa1ab; }

.form-row { margin-bottom: var(--space-2); }
.form-row--inline { display: flex; gap: var(--space-2); }
.form-row--inline > * { flex: 1; }
.form-hint { font-size: 12px; color: var(--color-text-muted); margin-top: 4px; }

fieldset { border: none; padding: 0; margin: 0 0 var(--space-3); }
legend { font-size: 15px; font-weight: 700; margin-bottom: var(--space-2); padding: 0; color: var(--color-primary); }

.search-bar {
  display: flex;
  gap: var(--space-1);
  margin-bottom: var(--space-2);
}
.search-bar input { flex: 1; }
.search-bar select { max-width: 180px; }

/* ---------- テーブル ---------- */
table { border-collapse: collapse; width: 100%; }
th { background: #edeff2; border-bottom: none; font-weight: 700; text-align: left; padding: 10px 8px; font-size: 13px; color: var(--color-text); white-space: nowrap; }
td { padding: 10px 8px; border-bottom: 1px solid var(--color-border-light); font-size: 14px; white-space: nowrap; }
tbody tr:hover { background: #fafbfc; }
td.numeric, th.numeric { text-align: right; }
.table-wrap { overflow-x: auto; }
.table-row-link { cursor: pointer; }

/* ---------- バッジ / ステータス ---------- */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  font-size: 12px;
  font-weight: 700;
  line-height: 1.8;
}
.badge--success { background: rgba(30, 123, 77, 0.12); color: var(--color-success); }
.badge--danger { background: rgba(179, 38, 30, 0.12); color: var(--color-danger); }
.badge--muted { background: #edeff2; color: var(--color-text-muted); }
.badge--accent { background: rgba(61, 122, 184, 0.12); color: var(--color-accent); }
.badge--warning { background: rgba(184, 134, 11, 0.12); color: #8a6500; }

/* ---------- タブ ---------- */
.tabs {
  display: flex;
  border-bottom: 1px solid var(--color-border-light);
  margin-bottom: var(--space-3);
  gap: var(--space-3);
}
.tab {
  padding: 10px 2px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text-muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  background: none;
  border-left: none;
  border-right: none;
  border-top: none;
  font-family: inherit;
}
.tab.is-active { color: var(--color-primary); border-bottom-color: var(--color-primary); }

/* ---------- ページネーション ---------- */
.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-2);
  font-size: 13px;
  color: var(--color-text-muted);
}
.pagination__pages { display: flex; gap: 4px; }
.pagination__pages button {
  width: 28px; height: 28px;
  border: 1px solid var(--color-border);
  background: #fff;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-size: 13px;
  color: var(--color-text);
}
.pagination__pages button.is-active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

/* ---------- ユーティリティ ---------- */
.text-muted { color: var(--color-text-muted); }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.flex { display: flex; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-gap-1 { display: flex; gap: var(--space-1); align-items: center; }
.flex-gap-2 { display: flex; gap: var(--space-2); align-items: center; }
.stack { display: flex; flex-direction: column; gap: var(--space-1); }

.kpi {
  text-align: left;
}
.kpi__label { font-size: 12px; color: var(--color-text-muted); margin-bottom: 4px; }
.kpi__value { font-size: 26px; font-weight: 700; color: var(--color-primary); }
.kpi__value.is-danger { color: var(--color-danger); }
.kpi__value.is-success { color: var(--color-success); }

.empty-state {
  text-align: center;
  padding: var(--space-4) var(--space-2);
  color: var(--color-text-muted);
}

/* ---------- レスポンシブ(スマホ幅) ---------- */
@media (max-width: 768px) {
  .app-shell { flex-direction: column; }

  .sidebar {
    width: 100%;
    flex-direction: row;
    align-items: center;
  }
  .sidebar__brand {
    border-bottom: none;
    border-right: 1px solid rgba(255, 255, 255, 0.15);
    white-space: nowrap;
    flex-shrink: 0;
  }
  .sidebar__nav {
    display: flex;
    flex: 1;
    padding: 0;
    overflow-x: auto;
  }
  .sidebar__link {
    flex-direction: column;
    gap: 4px;
    padding: 8px var(--space-1);
    margin: 2px;
    white-space: nowrap;
    font-size: 11px;
  }
  .sidebar__footer { display: none; }

  .content { padding: var(--space-2); }
  .page-header { align-items: flex-start; }

  .topbar { padding: 0 var(--space-2); }
  .topbar__user span { display: none; }

  .form-row--inline { flex-direction: column; gap: var(--space-2); }

  .table-wrap { -webkit-overflow-scrolling: touch; }
}