/* ========================================
   顶级论坛高手资料论坛 - 高手榜资料云社区
   动画样式表
   更新日期: 2026-02-25
   ======================================== */

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

[data-animate].animated {
    opacity: 1;
    transform: translateY(0);
}

[data-animate="fade-up"] {
    transform: translateY(30px);
}

[data-animate="fade-down"] {
    transform: translateY(-30px);
}

[data-animate="fade-left"] {
    transform: translateX(30px);
}

[data-animate="fade-right"] {
    transform: translateX(-30px);
}

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

[data-animate="fade"] {
    transform: none;
}

/* Stagger delays */
[data-delay="0"].animated { transition-delay: 0ms; }
[data-delay="100"].animated { transition-delay: 100ms; }
[data-delay="200"].animated { transition-delay: 200ms; }
[data-delay="300"].animated { transition-delay: 300ms; }
[data-delay="400"].animated { transition-delay: 400ms; }
[data-delay="500"].animated { transition-delay: 500ms; }
[data-delay="600"].animated { transition-delay: 600ms; }
[data-delay="700"].animated { transition-delay: 700ms; }
[data-delay="800"].animated { transition-delay: 800ms; }

/* ========================================
   Hero Particles Animation
   ======================================== */
.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.hero-particles::before,
.hero-particles::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    opacity: 0.5;
    animation: float 20s infinite ease-in-out;
}

.hero-particles::before {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.3) 0%, transparent 70%);
    top: 10%;
    left: 10%;
    animation-delay: 0s;
}

.hero-particles::after {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(118, 75, 162, 0.3) 0%, transparent 70%);
    bottom: 10%;
    right: 10%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(50px, -50px) scale(1.1);
    }
    50% {
        transform: translate(0, -100px) scale(1);
    }
    75% {
        transform: translate(-50px, -50px) scale(0.9);
    }
}

/* ========================================
   Counter Animation
   ======================================== */
[data-count] {
    display: inline-block;
}

/* ========================================
   Card Hover Effects
   ======================================== */
.category-card,
.expert-card,
.resource-card,
.activity-item {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.category-card:hover,
.expert-card:hover,
.resource-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
}

/* ========================================
   Button Hover Effects
   ======================================== */
.btn {
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary::after,
.btn-white::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.2),
        transparent
    );
    transition: left 0.5s ease;
}

.btn-primary:hover::after,
.btn-white:hover::after {
    left: 100%;
}

/* ========================================
   Link Hover Effects
   ======================================== */
.nav-link {
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease, left 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
    left: 10%;
}

/* ========================================
   Image Hover Effects
   ======================================== */
.expert-avatar img,
.resource-author img {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.expert-card:hover .expert-avatar img {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.3);
}

/* ========================================
   Tag Hover Effects
   ======================================== */
.tag {
    transition: all 0.2s ease;
}

.tag:hover {
    transform: translateY(-2px);
}

/* ========================================
   Loading Skeleton Animation
   ======================================== */
.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-gray-200) 25%,
        var(--color-gray-100) 50%,
        var(--color-gray-200) 75%
    );
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s infinite;
}

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

/* ========================================
   Pulse Animation for Badges
   ======================================== */
.activity-badge.hot,
.activity-badge.new {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

/* ========================================
   Gradient Animation
   ======================================== */
.gradient-text {
    background-size: 200% auto;
    animation: gradient-shift 3s ease infinite;
}

@keyframes gradient-shift {
    0%, 100% {
        background-position: 0% center;
    }
    50% {
        background-position: 100% center;
    }
}

/* ========================================
   Mobile Menu Animation
   ======================================== */
.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   Search Overlay Animation
   ======================================== */
.search-overlay {
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.search-overlay.active .search-container {
    animation: search-slide-down 0.4s ease;
}

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

/* ========================================
   Back to Top Button Animation
   ======================================== */
.back-to-top {
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
}

.back-to-top.visible {
    animation: bounce-in 0.4s ease;
}

@keyframes bounce-in {
    0% {
        opacity: 0;
        transform: translateY(20px) scale(0.8);
    }
    50% {
        transform: translateY(-5px) scale(1.05);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* ========================================
   Section Reveal Animation
   ======================================== */
section {
    opacity: 1;
}

section.revealed {
    animation: section-reveal 0.8s ease;
}

@keyframes section-reveal {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   Icon Hover Animation
   ======================================== */
.category-icon svg,
.activity-icon svg {
    transition: transform 0.3s ease;
}

.category-card:hover .category-icon svg {
    transform: scale(1.1) rotate(5deg);
}

.activity-item:hover .activity-icon svg {
    transform: scale(1.1);
}

/* ========================================
   Social Link Hover Animation
   ======================================== */
.social-link {
    transition: all 0.3s ease;
}

.social-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.3);
}

/* ========================================
   Footer Link Hover Animation
   ======================================== */
.footer-list a,
.link-list a {
    position: relative;
    display: inline-block;
}

.footer-list a::after,
.link-list a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: currentColor;
    transition: width 0.3s ease;
}

.footer-list a:hover::after,
.link-list a:hover::after {
    width: 100%;
}

/* ========================================
   Scroll Progress Indicator
   ======================================== */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--gradient-primary);
    z-index: 9999;
    transition: width 0.1s ease;
}

/* ========================================
   Page Transition Animation
   ======================================== */
.page-transition {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    z-index: 9998;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.page-transition.active {
    opacity: 1;
    visibility: visible;
}

/* ========================================
   Notification Toast Animation
   ======================================== */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    padding: 16px 24px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    z-index: 9999;
    transform: translateX(150%);
    transition: transform 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.toast.show {
    transform: translateX(0);
}

.toast.success {
    border-left: 4px solid #22c55e;
}

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

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

/* ========================================
   Modal Animation
   ======================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    z-index: var(--z-modal);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    max-width: 500px;
    width: 90%;
    transform: scale(0.9) translateY(20px);
    transition: transform 0.3s ease;
}

.modal.active .modal-content {
    transform: scale(1) translateY(0);
}

/* ========================================
   Tooltip Animation
   ======================================== */
.tooltip {
    position: relative;
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(-8px);
    padding: 8px 12px;
    background: var(--color-gray-800);
    color: var(--color-white);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-md);
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
    z-index: var(--z-tooltip);
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

/* ========================================
   Dropdown Animation
   ======================================== */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    min-width: 200px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.2s ease, visibility 0.2s ease, transform 0.2s ease;
    z-index: var(--z-dropdown);
}

.dropdown:hover .dropdown-menu,
.dropdown.active .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item {
    display: block;
    padding: var(--space-3) var(--space-4);
    color: var(--text-secondary);
    transition: background 0.2s ease, color 0.2s ease;
}

.dropdown-item:hover {
    background: var(--color-gray-50);
    color: var(--primary-color);
}

/* ========================================
   Shimmer Effect for Loading States
   ======================================== */
.shimmer {
    position: relative;
    overflow: hidden;
}

.shimmer::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.4),
        transparent
    );
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    100% {
        left: 100%;
    }
}

/* ========================================
   Focus States for Accessibility
   ======================================== */
a:focus-visible,
button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ========================================
   Selection Color
   ======================================== */
::selection {
    background: rgba(102, 126, 234, 0.3);
    color: var(--text-primary);
}

::-moz-selection {
    background: rgba(102, 126, 234, 0.3);
    color: var(--text-primary);
}