/* ==========================================================================
   动效样式 - 丝滑过渡、滚动揭示、Hero粒子背景
   ========================================================================== */

/* --------------------------------------------------------------------------
   关键帧
   -------------------------------------------------------------------------- */
@keyframes heroGradientShift {
    0%, 100% {
        background-position: 0% 0%, 100% 100%, 50% 50%;
    }
    50% {
        background-position: 50% 30%, 50% 70%, 30% 80%;
    }
}

@keyframes scrollWheel {
    0% { transform: translateX(-50%) translateY(0); opacity: 1; }
    50% { transform: translateX(-50%) translateY(8px); opacity: 0.5; }
    100% { transform: translateX(-50%) translateY(0); opacity: 1; }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.05); opacity: 0.85; }
}

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

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

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-30px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInLeft {
    from { opacity: 0; transform: translateX(-30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes fadeInRight {
    from { opacity: 0; transform: translateX(30px); }
    to { opacity: 1; transform: translateX(0); }
}

@keyframes zoomIn {
    from { opacity: 0; transform: scale(0.85); }
    to { opacity: 1; transform: scale(1); }
}

/* --------------------------------------------------------------------------
   揭示动画
   -------------------------------------------------------------------------- */
[data-reveal] {
    opacity: 0;
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    transition-delay: var(--reveal-delay, 0ms);
}

[data-reveal="fade-up"] {
    transform: translateY(40px);
}

[data-reveal="fade-down"] {
    transform: translateY(-40px);
}

[data-reveal="fade-left"] {
    transform: translateX(-40px);
}

[data-reveal="fade-right"] {
    transform: translateX(40px);
}

[data-reveal="zoom"] {
    transform: scale(0.9);
}

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

/* --------------------------------------------------------------------------
   Hero 首屏动画
   -------------------------------------------------------------------------- */
.reveal-line {
    display: block;
    overflow: hidden;
    animation: revealLine 1s cubic-bezier(0.4, 0, 0.2, 1) forwards;
    opacity: 0;
    transform: translateY(100%);
}

.reveal-line:nth-child(1) { animation-delay: 0.2s; }
.reveal-line:nth-child(2) { animation-delay: 0.4s; }

@keyframes revealLine {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* --------------------------------------------------------------------------
   加载状态
   -------------------------------------------------------------------------- */
.page-loading {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: var(--bg-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loading.loaded {
    opacity: 0;
    visibility: hidden;
}

.page-loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* --------------------------------------------------------------------------
   数字滚动动画
   -------------------------------------------------------------------------- */
.stat-num {
    transition: all 0.4s ease;
}

.stat-num.counting span {
    color: var(--accent);
}

/* --------------------------------------------------------------------------
   卡片悬浮光效
   -------------------------------------------------------------------------- */
.advantage-card,
.service-card,
.case-card {
    position: relative;
    overflow: hidden;
}

.advantage-card::after,
.service-card::after,
.case-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.4) 50%,
        transparent 100%);
    transition: left 0.6s ease;
    pointer-events: none;
}

.advantage-card:hover::after,
.service-card:hover::after,
.case-card:hover::after {
    left: 100%;
}

/* --------------------------------------------------------------------------
   链接悬停下划线
   -------------------------------------------------------------------------- */
.footer-col a,
.footer-bottom a,
.floating-item span {
    position: relative;
}

/* --------------------------------------------------------------------------
   微妙的浮动动效
   -------------------------------------------------------------------------- */
.about-photo-badge {
    animation: float 4s ease-in-out infinite;
}

/* --------------------------------------------------------------------------
   移动端减少动效
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    [data-reveal] {
        opacity: 1 !important;
        transform: none !important;
    }
}