/* Scroll Animation Utility Classes
 *
 * 使い方：
 *   アニメーションさせたい要素に以下のクラスを付与するだけで動作します。
 *
 *   フェードイン:         class="anim-fade"
 *   ズームイン:           class="anim-zoom"
 *   フェードアップ(下→上): class="anim-fade-up"
 *   フェードダウン(上→下): class="anim-fade-down"
 *   フェードレフト(右→左): class="anim-fade-left"
 *   フェードライト(左→右): class="anim-fade-right"
 *
 *   遅延オプション（任意）:
 *   class="anim-fade-up anim-delay-1"  → 0.2s 遅延
 *   class="anim-fade-up anim-delay-2"  → 0.4s 遅延
 *   class="anim-fade-up anim-delay-3"  → 0.6s 遅延
 *   class="anim-fade-up anim-delay-4"  → 0.8s 遅延
 *
 *   スピードオプション（任意）:
 *   class="anim-fade-up anim-slow"     → ゆっくり（1.2s）
 *   class="anim-fade-up anim-fast"     → 速め（0.4s）
 */

/* ─── 既存アニメーション ─── */
.anim-fade,
.anim-zoom,
.anim-fade-up,
.anim-fade-down,
.anim-fade-left,
.anim-fade-right {
    opacity: 0;
    transition: opacity 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 0.7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ─── 新規：段落ごとに文字が左から右へ流れる ─── */
.anim-text-flow {
    opacity: 0;
    overflow: hidden;
}

.anim-text-flow span {
    display: inline-block;
    transform: translateX(-100%);
    transition-property: transform;
    transition-duration: 0.8s;
    transition-timing-function: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.anim-text-flow.is-visible {
    opacity: 1;
}

.anim-text-flow.is-visible span {
    transform: translateX(0);
}

/* 段落ごとの遅延 */
.anim-text-flow p:nth-child(1) span { transition-delay: 0.1s; }
.anim-text-flow p:nth-child(2) span { transition-delay: 0.3s; }
.anim-text-flow p:nth-child(3) span { transition-delay: 0.5s; }
.anim-text-flow p:nth-child(4) span { transition-delay: 0.7s; }
.anim-text-flow p:nth-child(5) span { transition-delay: 0.9s; }

/* ─── 新規：マスクで左から右に表示される（段落単位） ─── */
.anim-mask-reveal {
    opacity: 0;
    position: relative;
    overflow: hidden;
}

.anim-mask-reveal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        rgba(247, 249, 250, 0) 0%,
        rgba(247, 249, 250, 0.9) 50%,
        rgba(247, 249, 250, 0) 100%
    );
    transform: translateX(-100%);
    transition: transform 1.2s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1;
}

.anim-mask-reveal.is-visible {
    opacity: 1;
}

.anim-mask-reveal.is-visible::before {
    transform: translateX(100%);
}

/* 段落ごとのマスク遅延 */
.anim-mask-reveal p:nth-child(1)::before { transition-delay: 0.1s; }
.anim-mask-reveal p:nth-child(2)::before { transition-delay: 0.4s; }
.anim-mask-reveal p:nth-child(3)::before { transition-delay: 0.7s; }
.anim-mask-reveal p:nth-child(4)::before { transition-delay: 1.0s; }
.anim-mask-reveal p:nth-child(5)::before { transition-delay: 1.3s; }

/* ─── 既存：文章が行単位で出現（静か系） ─── */
.anim-lines {
    opacity: 0;
    transition: opacity 0.1s;
}

.anim-lines.is-visible {
    opacity: 1;
}

.anim-lines span {
    display: inline-block;
    opacity: 0;
    transform: translateY(20px);
    transition-property: opacity, transform;
    transition-duration: 0.6s;
    transition-timing-function: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.anim-lines.is-visible span {
    opacity: 1;
    transform: translateY(0);
}

/* 行ごとに遅延（JSで自動付与） */
.anim-lines span:nth-of-type(1) { transition-delay: 0.1s; }
.anim-lines span:nth-of-type(2) { transition-delay: 0.2s; }
.anim-lines span:nth-of-type(3) { transition-delay: 0.3s; }
.anim-lines span:nth-of-type(4) { transition-delay: 0.4s; }
.anim-lines span:nth-of-type(5) { transition-delay: 0.5s; }
.anim-lines span:nth-of-type(6) { transition-delay: 0.6s; }
.anim-lines span:nth-of-type(7) { transition-delay: 0.7s; }
.anim-lines span:nth-of-type(8) { transition-delay: 0.8s; }

/* ─── 新規：静か系アニメーション ─── */
.anim-reveal {
    opacity: 0;
    transition-property: opacity, transform;
    transition-duration: 1.2s;
    transition-timing-function: cubic-bezier(0.19, 1, 0.22, 1);
}

.anim-reveal-up {
    transform: translateY(60px);
}

.anim-reveal-down {
    transform: translateY(-60px);
}

.anim-reveal-left {
    transform: translateX(60px);
}

.anim-reveal-right {
    transform: translateX(-60px);
}

.anim-reveal.is-visible {
    opacity: 1;
    transform: none;
}

/* ─── 新規：クール・スタイリッシュ系アニメーション ─── */

/* スライドイン（シャープ） */
.anim-slide {
    opacity: 0;
    transition-property: opacity, transform;
    transition-duration: 0.8s;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

.anim-slide-up {
    transform: translateY(100px);
}

.anim-slide-down {
    transform: translateY(-100px);
}

.anim-slide-left {
    transform: translateX(100px);
}

.anim-slide-right {
    transform: translateX(-100px);
}

.anim-slide.is-visible {
    opacity: 1;
    transform: none;
}

/* マスクスライド（洗練） */
.anim-mask {
    position: relative;
    overflow: hidden;
}

.anim-mask::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(247, 249, 250, 0.8), transparent);
    transform: translateX(-100%);
    transition: transform 1s cubic-bezier(0.4, 0, 0.2, 1);
}

.anim-mask.is-visible::before {
    transform: translateX(100%);
}

/* スケール＋回転（ダイナミック） */
.anim-scale-rotate {
    opacity: 0;
    transform: scale(0.8) rotate(-5deg);
    transition-property: opacity, transform;
    transition-duration: 0.9s;
    transition-timing-function: cubic-bezier(0.34, 1.56, 0.64, 1);
}

.anim-scale-rotate.is-visible {
    opacity: 1;
    transform: scale(1) rotate(0);
}

/* グリッチ風（テクニカル） */
.anim-glitch {
    opacity: 0;
    transform: translateX(-20px);
    transition-property: opacity, transform;
    transition-duration: 0.5s;
    transition-timing-function: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.anim-glitch.is-visible {
    opacity: 1;
    transform: translateX(0);
    animation: glitch 2s infinite;
}

@keyframes glitch {
    0%, 100% { transform: translateX(0); }
    92% { transform: translateX(-2px); }
    94% { transform: translateX(2px); }
    96% { transform: translateX(-2px); }
}

/* ─── 既存アニメーションの初期 transform ─── */
.anim-zoom {
    transform: scale(0.92);
}

.anim-fade-up {
    transform: translateY(40px);
}

.anim-fade-down {
    transform: translateY(-40px);
}

.anim-fade-left {
    transform: translateX(40px);
}

.anim-fade-right {
    transform: translateX(-40px);
}

/* ─── is-visible が付与されたときのゴール状態 ─── */
.anim-fade.is-visible,
.anim-zoom.is-visible,
.anim-fade-up.is-visible,
.anim-fade-down.is-visible,
.anim-fade-left.is-visible,
.anim-fade-right.is-visible {
    opacity: 1;
    transform: none;
}

/* ─── 遅延オプション ─── */
.anim-delay-1 { transition-delay: 0.2s; }
.anim-delay-2 { transition-delay: 0.4s; }
.anim-delay-3 { transition-delay: 0.6s; }
.anim-delay-4 { transition-delay: 0.8s; }
.anim-delay-5 { transition-delay: 1.0s; }

/* ─── スピードオプション ─── */
.anim-fast { transition-duration: 0.4s; }
.anim-slow { transition-duration: 1.2s; }

/* ─── アクセシビリティ：モーション低減設定を尊重 ─── */
@media (prefers-reduced-motion: reduce) {
    .anim-fade,
    .anim-zoom,
    .anim-fade-up,
    .anim-fade-down,
    .anim-fade-left,
    .anim-fade-right,
    .anim-reveal,
    .anim-slide,
    .anim-scale-rotate,
    .anim-glitch,
    .anim-text-flow,
    .anim-mask-reveal,
    .anim-lines {
        opacity: 1;
        transform: none;
        transition: none;
    }
    
    .anim-lines span,
    .anim-text-flow span {
        opacity: 1;
        transform: none;
        transition: none;
    }
    
    .anim-mask::before,
    .anim-mask-reveal::before {
        display: none;
    }
}