/* ========================================
   ローディング & インタラクションフィードバック
   ======================================== */

/* ローディングスピナー */
.loading-spinner {
    display: inline-block;
    width: 40px;
    height: 40px;
    border: 4px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spinner-rotation 0.8s linear infinite;
}

@keyframes spinner-rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ローディングオーバーレイ */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 1.5rem;
    z-index: 9999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.loading-overlay.active {
    opacity: 1;
    visibility: visible;
}

.loading-text {
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
}

/* スケルトンスクリーン */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--gray-200) 0%,
        var(--gray-100) 50%,
        var(--gray-200) 100%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.5s ease-in-out infinite;
    border-radius: 8px;
}

@keyframes skeleton-shimmer {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

.skeleton-text {
    height: 1em;
    margin-bottom: 0.5em;
}

.skeleton-title {
    height: 2em;
    width: 60%;
    margin-bottom: 1em;
}

.skeleton-image {
    height: 200px;
    width: 100%;
}

.skeleton-card {
    padding: 1.5rem;
    background: var(--white);
    border-radius: 16px;
}

/* プログレスバー */
.progress-bar {
    width: 100%;
    height: 4px;
    background: var(--gray-200);
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transition: width 0.3s ease;
    animation: progress-shimmer 2s ease-in-out infinite;
}

@keyframes progress-shimmer {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

/* トースト通知 */
.toast {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--white);
    color: var(--text-primary);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    display: flex;
    align-items: center;
    gap: 1rem;
    min-width: 300px;
    max-width: 500px;
    transform: translateY(120%);
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 10000;
}

.toast.show {
    transform: translateY(0);
    opacity: 1;
}

.toast-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.toast-message {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.toast-close {
    background: transparent;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-light);
    padding: 0.25rem;
    line-height: 1;
    transition: color 0.2s ease;
}

.toast-close:hover {
    color: var(--text-primary);
}

/* トースト種類別スタイル */
.toast.success {
    border-left: 4px solid #10b981;
}

.toast.error {
    border-left: 4px solid #ef4444;
}

.toast.warning {
    border-left: 4px solid var(--accent);
}

.toast.info {
    border-left: 4px solid var(--primary);
}

/* ボタンのローディング状態 */
.btn-loading {
    position: relative;
    color: transparent !important;
    pointer-events: none;
}

.btn-loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top-color: currentColor;
    border-radius: 50%;
    animation: spinner-rotation 0.6s linear infinite;
}

/* モバイル対応 */
@media (max-width: 768px) {
    .toast {
        left: 1rem;
        right: 1rem;
        bottom: 1rem;
        min-width: auto;
    }
    
    .loading-spinner {
        width: 32px;
        height: 32px;
        border-width: 3px;
    }
}

/* プリローダー（ページ全体） */
.page-preloader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 2rem;
    z-index: 99999;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

.preloader-logo {
    font-size: 3rem;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.1); opacity: 0.8; }
}