/* ==========================================
   PYGIT Interactions CSS - 滚动动画、转场、微交互样式
   ========================================== */

/* --- Scroll Reveal Animations --- */
[data-reveal] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* 不同延迟 */
[data-reveal][data-delay="1"] { transition-delay: 100ms; }
[data-reveal][data-delay="2"] { transition-delay: 200ms; }
[data-reveal][data-delay="3"] { transition-delay: 300ms; }
[data-reveal][data-delay="4"] { transition-delay: 400ms; }
[data-reveal][data-delay="5"] { transition-delay: 500ms; }

/* 不同方向 */
[data-reveal="fade-up"] { transform: translateY(30px); }
[data-reveal="fade-down"] { transform: translateY(-30px); }
[data-reveal="fade-left"] { transform: translateX(30px); }
[data-reveal="fade-right"] { transform: translateX(-30px); }
[data-reveal="zoom-in"] { transform: scale(0.9); }
[data-reveal="fade"] { transform: none; }

/* Stagger 子元素 */
.reveal-stagger > * { opacity: 0; transform: translateY(20px); transition: opacity 0.5s ease, transform 0.5s ease; }
.reveal-stagger.is-visible > * { opacity: 1; transform: translateY(0); }
.reveal-stagger > *:nth-child(1) { transition-delay: 50ms; }
.reveal-stagger > *:nth-child(2) { transition-delay: 100ms; }
.reveal-stagger > *:nth-child(3) { transition-delay: 150ms; }
.reveal-stagger > *:nth-child(4) { transition-delay: 200ms; }
.reveal-stagger > *:nth-child(5) { transition-delay: 250ms; }
.reveal-stagger > *:nth-child(6) { transition-delay: 300ms; }

/* --- Counter Animation --- */
[data-counter] { font-variant-numeric: tabular-nums; }

/* --- Page Transitions --- */
body { opacity: 1; transition: opacity 0.2s ease; }
body.page-exiting { opacity: 0; }
body.page-loaded { animation: pageEnter 0.4s ease; }

@keyframes pageEnter {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- Header Scroll State --- */
.site-header.scrolled {
    box-shadow: var(--shadow-card);
    background: rgba(255,255,255,0.98);
}

/* --- Form Focus States --- */
.form-group { position: relative; transition: all var(--transition-base); }
.form-group.focused .form-label { color: var(--c-primary); }
.form-group.focused .form-input,
.form-group.focused .form-textarea { border-color: var(--c-primary); box-shadow: 0 0 0 3px var(--c-primary-light); }

.form-label { transition: color var(--transition-fast); }
.form-label.has-value { color: var(--c-text); }

/* --- Button Ripple --- */
.btn { position: relative; overflow: hidden; }

/* --- Card Hover Enhancement --- */
.card, .service-card, .project-card, .blog-card, .about-service-item {
    will-change: transform, box-shadow;
}

/* --- Video Tab Transition --- */
.video-tab { position: relative; overflow: hidden; }
.video-tab::before {
    content: '';
    position: absolute; inset: 0;
    background: var(--c-primary);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--transition-base);
    z-index: -1;
}
.video-tab.active::before { transform: scaleX(1); }

/* --- Focus Visible Enhancement --- */
:focus-visible {
    outline: 2px solid var(--c-primary);
    outline-offset: 2px;
}

button:focus-visible, a:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
    outline: 2px solid var(--c-primary);
    outline-offset: 2px;
}

/* --- Loading Skeleton --- */
.skeleton {
    background: linear-gradient(90deg, var(--c-bg-light) 25%, var(--c-border) 50%, var(--c-bg-light) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    border-radius: var(--radius);
}

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

.skeleton-text {
    height: 1rem;
    margin-bottom: var(--space-2);
}
.skeleton-title { height: 1.5rem; width: 60%; margin-bottom: var(--space-4); }
.skeleton-avatar { width: 48px; height: 48px; border-radius: 50%; }
.skeleton-image { aspect-ratio: 16/9; width: 100%; }

/* --- Toast/Notification --- */
.toast-container {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.toast {
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius);
    background: var(--c-bg);
    box-shadow: var(--shadow-lg);
    border-left: 4px solid var(--c-primary);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-width: 280px;
    max-width: 400px;
    animation: toastIn 0.3s ease;
}

.toast--success { border-color: var(--c-success); }
.toast--error { border-color: var(--c-error); }
.toast--warning { border-color: var(--c-warning); }

@keyframes toastIn {
    from { opacity: 0; transform: translateX(100%); }
    to { opacity: 1; transform: translateX(0); }
}

/* --- Modal/Dialog --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: var(--z-modal-backdrop);
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}
.modal-overlay.open { opacity: 1; visibility: visible; }

.modal {
    background: var(--c-bg);
    border-radius: var(--radius-lg);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform var(--transition-base);
}
.modal-overlay.open .modal { transform: scale(1); }

.modal-header { padding: var(--space-6); border-bottom: 1px solid var(--c-border); display: flex; justify-content: space-between; align-items: center; }
.modal-title { font-size: var(--fs-xl); font-weight: var(--fw-bold); }
.modal-close { width: 32px; height: 32px; border-radius: var(--radius); display: flex; align-items: center; justify-content: center; color: var(--c-text-secondary); }
.modal-close:hover { background: var(--c-bg-light); color: var(--c-text); }
.modal-body { padding: var(--space-6); }
.modal-footer { padding: var(--space-6); border-top: 1px solid var(--c-border); display: flex; justify-content: flex-end; gap: var(--space-3); }

/* --- Tooltip --- */
.tooltip {
    position: absolute;
    z-index: var(--z-tooltip);
    padding: var(--space-2) var(--space-3);
    background: var(--c-text);
    color: var(--c-text-inverse);
    font-size: var(--fs-xs);
    border-radius: var(--radius);
    white-space: nowrap;
    pointer-events: none;
    opacity: 0;
    transition: opacity var(--transition-fast);
}
.tooltip::after {
    content: '';
    position: absolute;
    width: 0; height: 0;
    border: 5px solid transparent;
}
.tooltip-top { bottom: 100%; left: 50%; transform: translateX(-50%); margin-bottom: 5px; }
.tooltip-top::after { top: 100%; left: 50%; margin-left: -5px; border-top-color: var(--c-text); }

/* --- Floating Action Button --- */
.fab {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-fixed);
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background: var(--c-primary);
    color: var(--c-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}
.fab:hover { transform: scale(1.1); box-shadow: var(--shadow-hover); }
.fab:active { transform: scale(0.95); }

/* --- Progress Bar (页面顶部加载进度) --- */
.progress-bar {
    position: fixed;
    top: 0; left: 0;
    height: 3px;
    background: var(--c-primary);
    z-index: var(--z-toast);
    transform-origin: left;
    transform: scaleX(0);
    transition: transform 0.2s ease;
}

/* --- Back to Top --- */
.back-to-top {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    z-index: var(--z-fixed);
    width: 44px;
    height: 44px;
    border-radius: var(--radius-full);
    background: var(--c-primary);
    color: var(--c-text-inverse);
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: opacity var(--transition-base), transform var(--transition-base);
}
.back-to-top.visible { display: flex; opacity: 1; }
.back-to-top:hover { background: var(--c-primary-dark); transform: translateY(-2px); }

/* Reduced Motion Override */
@media (prefers-reduced-motion: reduce) {
    [data-reveal], .skeleton, .toast, .modal, .back-to-top,
    .btn, .card, .video-tab, .form-input, .form-textarea {
        animation: none !important;
        transition: none !important;
    }
    [data-reveal] { opacity: 1; transform: none; }
}