:root {
  --bg: #f4f6f9; --panel: #ffffff; --ink: #1d2733; --muted: #5d6b7a; --line: #d9dfe7;
  --head: #1f3a5f; --head-ink: #ffffff; --head-sub: #c9d6e6;
  --primary: #1f7ae0; --primary-ink: #ffffff; --ok: #1e7f4f; --ok-bg: #e5f4ec; --warn: #9a5b00; --warn-bg: #fff3dc;
  --danger: #b42318; --danger-bg: #fdecea; --info-bg: #e8f1fc; --sel: #eef4fd;
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body { font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Noto Sans JP", "Yu Gothic UI", sans-serif; color: var(--ink); background: var(--bg); font-size: 15px; line-height: 1.6; }
a { color: var(--primary); }
h1 { font-size: 22px; margin: 0 0 12px; }
h2 { font-size: 18px; margin: 20px 0 10px; }
h3 { font-size: 16px; margin: 16px 0 8px; }
.muted { color: var(--muted); }
.small { font-size: 13px; }
.error { color: var(--danger); background: var(--danger-bg); padding: 8px 12px; border-radius: 6px; }

/* ヘッダー：契約アカウント選択を常時表示 */
.topbar { display: flex; align-items: center; gap: 16px; background: var(--head); color: var(--head-ink); padding: 10px 20px; position: sticky; top: 0; z-index: 10; flex-wrap: wrap; }
.brand { color: var(--head-ink); font-weight: 700; text-decoration: none; font-size: 16px; }
.conn-switch { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--head-sub); }
.conn-switch select { font-size: 15px; font-weight: 700; padding: 5px 8px; border-radius: 6px; border: 0; min-width: 160px; }
.top-actions { margin-left: auto; display: flex; gap: 12px; align-items: center; }
.toplink { color: var(--head-ink); background: none; border: 0; font: inherit; font-size: 14px; cursor: pointer; text-decoration: none; padding: 4px 6px; }

.layout { display: grid; grid-template-columns: 230px minmax(0, 1fr); min-height: calc(100vh - 54px); }
.layout > * { min-width: 0; }
.sidenav { background: var(--panel); border-right: 1px solid var(--line); padding: 12px 0; }
.sidenav a { display: block; padding: 9px 20px; color: var(--ink); text-decoration: none; }
.sidenav a.active { background: var(--sel); color: var(--primary); font-weight: 700; border-right: 3px solid var(--primary); }
.sidenav .navnote { font-size: 12px; color: var(--muted); padding: 0 20px; margin-top: -4px; }
.sidenav hr { border: 0; border-top: 1px solid var(--line); margin: 10px 0; }
main { padding: 20px 28px 60px; max-width: 1280px; outline: none; }

.crumbs { font-size: 13px; color: var(--muted); margin-bottom: 8px; }
.crumbs a { color: var(--muted); }
.panel { background: var(--panel); border: 1px solid var(--line); border-radius: 10px; padding: 16px 18px; margin-bottom: 16px; }
.grid2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.grid3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }

table.list { width: 100%; border-collapse: collapse; background: var(--panel); }
table.list th, table.list td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: middle; }
table.list th { font-size: 13px; color: var(--muted); font-weight: 600; background: #f8fafc; }
table.list td.actions { white-space: nowrap; text-align: right; }

.badge { display: inline-block; font-size: 12px; padding: 1px 8px; border-radius: 999px; border: 1px solid transparent; white-space: nowrap; }
.badge.ok { background: var(--ok-bg); color: var(--ok); border-color: #b9e0c9; }
.badge.warn { background: var(--warn-bg); color: var(--warn); border-color: #f1d49a; }
.badge.danger { background: var(--danger-bg); color: var(--danger); border-color: #f3b8b2; }
.badge.info { background: var(--info-bg); color: #1d5ea8; border-color: #bcd6f5; }
.badge.plain { background: #f1f3f6; color: var(--muted); border-color: var(--line); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 36px; min-width: 88px; padding: 6px 14px; border-radius: 8px; border: 1px solid var(--line); background: #fff; color: var(--ink); font: inherit; font-size: 14px; cursor: pointer; text-decoration: none; white-space: nowrap; }
.btn:hover { border-color: #a9b6c6; }
.btn.primary { background: var(--primary); color: var(--primary-ink); border-color: var(--primary); }
.btn.ok { background: var(--ok); color: #fff; border-color: var(--ok); }
.btn.danger { color: var(--danger); border-color: #f0b4ae; }
.btn.small { min-height: 30px; min-width: 0; padding: 3px 10px; font-size: 13px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn.wide { width: 100%; }
.btnrow { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }

label { display: block; font-size: 14px; margin-bottom: 10px; }
input[type=text], input[type=email], input[type=password], input[type=search], select, textarea { width: 100%; font: inherit; padding: 7px 10px; border: 1px solid var(--line); border-radius: 7px; background: #fff; margin-top: 4px; }
textarea { min-height: 110px; resize: vertical; }
.inline { display: flex; gap: 8px; align-items: flex-end; flex-wrap: wrap; }
.inline label { margin: 0; flex: 1 1 200px; }

.notice { padding: 10px 14px; border-radius: 8px; margin: 10px 0; }
.notice.info { background: var(--info-bg); }
.notice.warn { background: var(--warn-bg); }
.notice.danger { background: var(--danger-bg); }
.notice.ok { background: var(--ok-bg); }

/* レッスン編集 */
.editor { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 18px; align-items: start; }
.col-box { border: 1px dashed #b7c3d2; border-radius: 10px; padding: 10px; margin-bottom: 14px; background: #fbfcfe; }
.col-box > .col-title { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.block { background: #fff; border: 1px solid var(--line); border-radius: 8px; padding: 10px 12px; margin-bottom: 10px; }
.block.keep { background: #f3f5f8; color: var(--muted); }
.block.changed { border-color: var(--primary); box-shadow: 0 0 0 1px var(--primary) inset; }
.block.new { border-color: var(--ok); }
.block-head { display: flex; align-items: center; gap: 8px; margin-bottom: 6px; }
.block-head .kind { font-weight: 700; font-size: 13px; }
.block-head .btnrow { margin-left: auto; }
.side-panel { position: sticky; top: 70px; }
.changes li { margin-bottom: 4px; }
.video-pick { display: flex; gap: 10px; align-items: center; }
.video-pick img { width: 96px; height: 54px; object-fit: cover; border-radius: 4px; background: #e6eaf0; }
.thumb { width: 96px; height: 54px; object-fit: cover; border-radius: 4px; background: #e6eaf0; display: block; }

.drop { border: 2px dashed #a9b9cc; border-radius: 10px; padding: 18px; text-align: center; background: #fbfcfe; }
.progress { height: 8px; background: #e6eaf0; border-radius: 99px; overflow: hidden; margin-top: 6px; }
.progress > span { display: block; height: 100%; background: var(--primary); width: 0; }

.toast { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); background: #1d2733; color: #fff; padding: 10px 16px; border-radius: 8px; z-index: 50; max-width: 90vw; }

/* ログイン */
.login-page { display: flex; min-height: 100vh; align-items: center; justify-content: center; padding: 16px; }
.login-box { background: #fff; border: 1px solid var(--line); border-radius: 12px; padding: 28px 26px; width: 100%; max-width: 400px; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .sidenav { display: flex; overflow-x: auto; padding: 0; border-right: 0; border-bottom: 1px solid var(--line); white-space: nowrap; }
  .sidenav a { padding: 10px 14px; }
  .sidenav a.active { border-right: 0; border-bottom: 3px solid var(--primary); }
  .sidenav hr, .sidenav .navnote { display: none; }
  main { padding: 14px 14px 60px; }
  .grid2, .grid3, .editor { grid-template-columns: 1fr; }
  .side-panel { position: static; }
  .topbar { padding: 8px 14px; gap: 8px; }
  .conn-switch span { display: none; }
  table.list th.hide-sp, table.list td.hide-sp { display: none; }
  /* 一覧表は行ごとのカード表示にして横はみ出しを防ぐ */
  table.list thead { display: none; }
  table.list, table.list tbody { display: block; }
  table.list tr { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 10px; padding: 8px 4px; border-bottom: 1px solid var(--line); }
  table.list td { border: 0; padding: 0; }
  table.list td.actions { flex-basis: 100%; text-align: left; white-space: normal; }
  table.list tr[hidden] { display: none; }
  .topbar .brand { flex: 1 1 100%; }
  .conn-switch select { min-width: 0; max-width: 60vw; }
}