/* ============================================
   UX Enhance — Phase 2 体験の磨き込み（全講座横断・追加のみ）
   - レッスン本文／ビュー切替のフェードイン
   - スクロール進捗バーのなめらか化
   - サイドバー現在地スクロールのなめらか化
   すべて prefers-reduced-motion を尊重。
   ============================================ */

@keyframes nvaEnter {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* JS が new content 挿入時に付与（reflow で再生）。 */
.lesson-content.nva-enter,
.view-mount.nva-view-enter {
  animation: nvaEnter var(--duration-normal, 320ms)
    var(--ease-out-expo, cubic-bezier(0.16, 1, 0.3, 1)) both;
}

/* 読書進捗バーをなめらかに追従させる。 */
.scroll-progress__bar {
  transition: width 120ms linear;
}

/* サイドバーの現在地への自動スクロールをなめらかに。 */
.sidebar {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  .lesson-content.nva-enter,
  .view-mount.nva-view-enter { animation: none; }
  .scroll-progress__bar { transition: none; }
  .sidebar { scroll-behavior: auto; }
}

/* ── ゲスト（ログイン不要）閲覧 ───────────────────────────── */
.auth-guest {
  margin: 18px auto 8px;
  text-align: center;
}
.auth-guest__btn {
  font-size: var(--text-sm, 0.875rem);
}

.guest-banner {
  position: fixed;
  left: 50%;
  bottom: calc(env(safe-area-inset-bottom, 0px) + 16px);
  transform: translateX(-50%);
  z-index: 90;
  display: flex;
  align-items: center;
  gap: var(--space-3, 12px);
  max-width: min(92vw, 560px);
  padding: 10px 12px 10px 16px;
  border-radius: 999px;
  background: color-mix(in oklch, var(--color-primary, #6366f1) 14%, var(--color-surface, #fff));
  color: var(--color-text, #111);
  border: 1px solid color-mix(in oklch, var(--color-primary, #6366f1) 35%, transparent);
  box-shadow: 0 10px 30px rgba(16, 24, 40, 0.18);
  font-size: var(--text-sm, 0.875rem);
}
.guest-banner[hidden] { display: none; }
.guest-banner__msg { line-height: 1.4; }
.guest-banner__login {
  flex: none;
  border: 0;
  border-radius: 999px;
  padding: 6px 16px;
  font-weight: var(--weight-bold, 700);
  background: var(--color-primary, #6366f1);
  color: #fff;
  cursor: pointer;
}
.guest-banner__login:hover { filter: brightness(1.06); }

/* ============================================
   東山講座リブランド — ダッシュボード検索＆続きから再開
   （2026-07-18 追加。既存 .dashboard__hero に載せる軽量UI）
   ============================================ */
.dashboard__resume { margin-top: 18px; }
.dashboard__resume-btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  max-width: 100%;
  padding: 10px 18px 10px 12px;
  border: 1px solid var(--color-border-brand, #c7d2fe);
  border-radius: 999px;
  background: var(--color-surface-raised, #fff);
  color: var(--color-text, #0f172a);
  cursor: pointer;
  text-align: left;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.06);
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.dashboard__resume-btn:hover {
  box-shadow: 0 4px 14px rgba(79, 70, 229, 0.16);
  transform: translateY(-1px);
}
.dashboard__resume-icon {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--gradient-brand, linear-gradient(135deg, #4f46e5, #7c3aed));
  color: #fff;
  font-size: 13px;
}
.dashboard__resume-copy { display: flex; flex-direction: column; min-width: 0; }
.dashboard__resume-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--color-primary, #4f46e5);
}
.dashboard__resume-title {
  font-size: 13.5px;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dashboard__toolbar { margin-top: 16px; }
.dashboard__search {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 460px;
  padding: 10px 16px;
  border: 1px solid var(--color-border, #e2e8f0);
  border-radius: 14px;
  background: var(--color-surface-raised, #fff);
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}
.dashboard__search:focus-within {
  border-color: var(--color-primary, #4f46e5);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}
.dashboard__search-icon { flex: 0 0 auto; font-size: 14px; opacity: 0.75; }
.dashboard__search-input {
  flex: 1 1 auto;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  font: inherit;
  font-size: 14px;
  color: var(--color-text, #0f172a);
}
.dashboard__search-input::placeholder { color: var(--color-text-muted, #94a3b8); }
.dashboard__search-input::-webkit-search-cancel-button { -webkit-appearance: none; }
.dashboard__search-empty {
  margin-top: 10px;
  font-size: 13px;
  color: var(--color-text-muted, #64748b);
}
@media (max-width: 640px) {
  .dashboard__resume-btn { width: 100%; }
  .dashboard__search { max-width: none; }
}