/* ==========================================================
   page-transition.css
   アプリ内ナビゲーション: プログレスバー + フェードトランジション
   （アプリ間遷移は従来の全画面ローディング page-transition.js が担当）
   ========================================================== */

/* ---------- プログレスバー（画面上部固定・3px） ---------- */
#xidea-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    z-index: 100000; /* 全画面ローディング(99999)より上 */
    pointer-events: none;
    opacity: 1;
    transition: opacity 250ms ease;
}

#xidea-progress.is-hidden {
    opacity: 0;
}

#xidea-progress .xidea-progress__bar {
    position: relative;
    height: 100%;
    width: 0%;
    background: var(--xidea-progress-color, var(--xidea-accent, #FF6B35));
    border-radius: 0 2px 2px 0;
    box-shadow:
        0 0 8px color-mix(in srgb, var(--xidea-progress-color, var(--xidea-accent, #FF6B35)) 55%, transparent),
        0 0 2px var(--xidea-progress-color, var(--xidea-accent, #FF6B35));
    overflow: hidden;
}

/* color-mix 非対応ブラウザ向けフォールバック（box-shadow なしでも成立） */
@supports not (background: color-mix(in srgb, red 50%, blue)) {
    #xidea-progress .xidea-progress__bar {
        box-shadow: 0 0 6px var(--xidea-progress-color, var(--xidea-accent, #FF6B35));
    }
}

/* 70%滞留中の shimmer: 白い光が右へ流れる */
#xidea-progress.is-waiting .xidea-progress__bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: -40%;
    width: 40%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.65) 50%,
        transparent 100%
    );
    animation: xidea-progress-shimmer 1.1s ease-in-out infinite;
}

@keyframes xidea-progress-shimmer {
    0%   { left: -40%; }
    100% { left: 110%; }
}

/* ---------- コンテンツフェード（arrival フェードイン専用。departure フェードは廃止） ---------- */
.xidea-fade {
    will-change: opacity;
}

.xidea-fade--out {
    opacity: 0 !important;
}

.xidea-fade--in {
    opacity: 1;
    transition: opacity 200ms ease-in;
}

/* 到着直後（JS実行前）のフラッシュ防止:
   meta.php の早期スクリプトが html[data-xidea-arriving] を付与し、
   header / footer / スクリプト以外の body 直下要素を透明で開始させる */
html[data-xidea-arriving] body > :not(.xidea-header):not(.xidea-footer):not(script):not(style):not(svg):not(.modal):not(.modal-backdrop):not(#xidea-progress):not(#page-transition-loading):not(#xidea-loading-overlay):not(#line-browser-overlay):not(#xidea-spinner) {
    opacity: 0;
}

/* ---------- アクセシビリティ ---------- */
@media (prefers-reduced-motion: reduce) {
    .xidea-fade,
    .xidea-fade--in {
        transition: none;
    }
    #xidea-progress.is-waiting .xidea-progress__bar::after {
        animation: none;
    }
}

/* ---------- 中央円形スピナー（アプリ内遷移時・二重リング逆回転） ---------- */
#xidea-spinner {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 44px;
    height: 44px;
    z-index: 100000;
    pointer-events: none;
    opacity: 0;
    transition: opacity 150ms ease;
}

#xidea-spinner.is-visible {
    opacity: 1;
}

.xidea-spinner__ring {
    position: absolute;
    border-radius: 50%;
    border: 3px solid transparent;
    will-change: transform;
}

.xidea-spinner__ring--outer {
    inset: 0;
    border-top-color: var(--xidea-progress-color, var(--xidea-accent, #4f8cff));
    border-right-color: var(--xidea-progress-color, var(--xidea-accent, #4f8cff));
    animation: xidea-spin 0.9s linear infinite;
}

.xidea-spinner__ring--inner {
    inset: 9px;
    border-bottom-color: var(--xidea-progress-color, var(--xidea-accent, #4f8cff));
    border-left-color: var(--xidea-progress-color, var(--xidea-accent, #4f8cff));
    opacity: 0.55; /* color-mix 不使用で濃淡を表現（旧ブラウザ互換） */
    animation: xidea-spin 0.6s linear infinite reverse;
}

@keyframes xidea-spin {
    to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
    #xidea-spinner { display: none; } /* バーのみで通知 */
}

/* ---------- departure ブラーアウト（アプリ内遷移時） ---------- */
.xidea-blur-out {
    filter: blur(10px) !important;
    opacity: 0.6 !important;
    transition: filter 130ms ease, opacity 130ms ease;
    pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
    .xidea-blur-out {
        filter: none !important;
        opacity: 1 !important;
        transition: none;
    }
}