/******************************************************************************
 * @file    adu-animations.css
 * @brief   Adu Network Studio — 动画与微交互系统
 *
 * @details 本文件提供所有动画与微交互效果，合并自：
 *          - apple-glass.css (滚动进度条/返回顶部/滚动揭示/骨架屏/按钮效果/Toast)
 *          - 新增增强：链接下划线动画/按钮按压/移动端菜单/blur-up图片/页面过渡
 *
 * @version  1.0.0
 ******************************************************************************/

/* ============================================================
   1. Scroll Progress Bar
   ============================================================ */

.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: var(--scroll-progress-height);
    background: linear-gradient(90deg,
        var(--accent-primary) 0%,
        var(--accent-info) 50%,
        #6366f1 100%);
    z-index: 9999;
    width: 0%;
    transition: width 0.1s linear;
    border-radius: 0 2px 2px 0;
    pointer-events: none;
}


/* ============================================================
   2. Back to Top Button
   ============================================================ */

.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: var(--back-to-top-size);
    height: var(--back-to-top-size);
    border-radius: 50%;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: var(--glass-shadow);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    opacity: 0;
    transform: translateY(16px);
    pointer-events: none;
    transition: opacity 0.35s var(--ease-out-expo),
                transform 0.35s var(--ease-out-expo),
                box-shadow 0.25s ease,
                background-color 0.25s ease;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 32px rgba(37, 99, 235, 0.18);
    background: var(--brand-gradient);
    color: #fff;
    border-color: transparent;
}

.back-to-top:active {
    transform: scale(0.92);
    transition: transform 0.12s var(--ease-out-expo);
}


/* ============================================================
   3. Scroll-Reveal Animations
   ============================================================ */

/* Base reveal */
.reveal {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.7s var(--ease-out-expo),
                transform 0.7s var(--ease-out-expo);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Up */
.reveal-up {
    opacity: 0;
    transform: translateY(48px);
    transition: opacity 0.7s var(--ease-out-expo),
                transform 0.7s var(--ease-out-expo);
}

.reveal-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Left */
.reveal-left {
    opacity: 0;
    transform: translateX(-40px);
    transition: opacity 0.7s var(--ease-out-expo),
                transform 0.7s var(--ease-out-expo);
}

.reveal-left.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Right */
.reveal-right {
    opacity: 0;
    transform: translateX(40px);
    transition: opacity 0.7s var(--ease-out-expo),
                transform 0.7s var(--ease-out-expo);
}

.reveal-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Scale */
.reveal-scale {
    opacity: 0;
    transform: scale(0.88);
    transition: opacity 0.65s var(--ease-out-expo),
                transform 0.65s var(--ease-out-expo);
}

.reveal-scale.visible {
    opacity: 1;
    transform: scale(1);
}

/* Stagger delays */
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }
.reveal-delay-5 { transition-delay: 0.40s; }


/* ============================================================
   4. Skeleton Loaders
   ============================================================ */

.skeleton {
    background: linear-gradient(
        90deg,
        var(--bg-muted) 25%,
        var(--bg-emphasis) 50%,
        var(--bg-muted) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-shimmer 1.6s ease-in-out infinite;
    border-radius: var(--radius-sm);
}

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

.skeleton-text {
    height: 1rem;
    margin-bottom: 0.75rem;
    border-radius: var(--radius-xs);
}

.skeleton-text:last-child {
    width: 60%;
}

.skeleton-title {
    height: 1.5rem;
    width: 70%;
    margin-bottom: 1rem;
    border-radius: var(--radius-sm);
}

.skeleton-avatar {
    width: 56px;
    height: 56px;
    border-radius: 50%;
}

.skeleton-image {
    width: 100%;
    height: 180px;
    border-radius: var(--radius-xl);
}

.skeleton-card {
    height: 200px;
    border-radius: var(--radius-xl);
}

/* Blog card skeleton */
.skeleton-blog-card {
    padding: 1.5rem;
    border-radius: var(--radius-xl);
    background: var(--card-bg);
    border: 1px solid var(--border-default);
}

/* Resource card skeleton */
.skeleton-resource-card {
    border-radius: var(--radius-xl);
    overflow: hidden;
    background: var(--card-bg);
    border: 1px solid var(--border-default);
}


/* ============================================================
   5. Link Underline Animation
   ============================================================ */

.link-underline {
    position: relative;
    text-decoration: none;
}

.link-underline::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent-primary);
    border-radius: 2px;
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.35s var(--ease-out-expo);
}

.link-underline:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}


/* ============================================================
   6. Page Enter Transition
   ============================================================ */

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

main {
    animation: page-enter 0.35s var(--ease-out-expo);
}


/* ============================================================
   7. Blur-up Image Loading
   ============================================================ */

.img-blur-load {
    filter: blur(12px);
    transform: scale(1.05);
    transition: filter 0.5s ease, transform 0.5s var(--ease-out-expo);
}

.img-blur-load.loaded {
    filter: blur(0);
    transform: scale(1);
}


/* ============================================================
   8. Hero Decorations
   ============================================================ */

.hero-decor {
    position: absolute;
    pointer-events: none;
    z-index: 1;
}

.hero-decor-circle {
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.12);
    animation: hero-float 6s ease-in-out infinite;
}

.hero-decor-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.25);
    animation: hero-pulse 3s ease-in-out infinite;
}

@keyframes hero-float {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(-18px); }
}

@keyframes hero-pulse {
    0%, 100% { opacity: 0.25; }
    50%      { opacity: 0.6; }
}


/* ============================================================
   9. Toast Notification
   ============================================================ */

.toast-adu {
    position: fixed;
    bottom: 1.5rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    padding: 0.85rem 1.5rem;
    border-radius: var(--radius-full);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: var(--glass-shadow);
    z-index: 1001;
    font-weight: 600;
    font-size: 0.9rem;
    opacity: 0;
    pointer-events: none;
    transition: transform 0.4s var(--ease-out-expo),
                opacity 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.toast-adu.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

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


/* ============================================================
   10. Mobile Menu Animation
   ============================================================ */

@media (max-width: 991.98px) {
    .navbar-collapse {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.96);
        backdrop-filter: var(--glass-blur-heavy);
        -webkit-backdrop-filter: var(--glass-blur-heavy);
        z-index: 1030;
        padding: 5rem 1.5rem 2rem;
        display: flex;
        flex-direction: column;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.25s ease;
    }

    .navbar-collapse.showing,
    .navbar-collapse.show {
        opacity: 1;
        pointer-events: auto;
    }

    [data-theme="dark"] .navbar-collapse {
        background: rgba(9, 9, 11, 0.96);
    }

    .navbar-toggler {
        position: relative;
        z-index: 1040;
    }
}


/* ============================================================
   11. Counter Animation Helper
   ============================================================ */

.counter-value {
    display: inline-block;
    font-variant-numeric: tabular-nums;
    font-feature-settings: "tnum";
}


/* ============================================================
   12. Glass Card Glow (Mouse Tracking)
    =========================================================== */

.glass-card-glow {
    position: relative;
    overflow: hidden;
}

.glass-card-glow::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: radial-gradient(
        600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
        rgba(37, 99, 235, 0.12),
        transparent 40%
    );
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
    z-index: 1;
}

.glass-card-glow:hover::after {
    opacity: 1;
}


/* ============================================================
   13. Pulse Ring (Status Indicator)
   ============================================================ */

.status-pulse {
    box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.5);
    animation: pulse-ring 2s infinite;
}

@keyframes pulse-ring {
    0%   { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.55); }
    70%  { box-shadow: 0 0 0 10px rgba(34, 211, 238, 0); }
    100% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0); }
}


/* ============================================================
   14. Responsive Fixes
   ============================================================ */

@media (max-width: 768px) {
    .back-to-top {
        bottom: 1.25rem;
        right: 1.25rem;
        width: 42px;
        height: 42px;
    }

    .reveal,
    .reveal-up,
    .reveal-left,
    .reveal-right,
    .reveal-scale {
        transform: translateY(24px);
    }

    .reveal-left,
    .reveal-right {
        transform: translateY(24px); /* Mobile: always fade up */
    }
}


/* ============================================================
   15. Reduced Motion
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
    .reveal,
    .reveal-up,
    .reveal-left,
    .reveal-right,
    .reveal-scale {
        opacity: 1;
        transform: none;
        transition: none;
    }

    .back-to-top {
        transition: opacity 0.15s ease;
    }

    .skeleton {
        animation: none;
        background: var(--bg-muted);
    }

    .card-adu-hover:hover,
    .glass-card-hover:hover {
        transform: none;
    }

    main {
        animation: none;
    }

    .img-blur-load {
        filter: none;
        transform: none;
        transition: none;
    }
}