/* =====================================================
   Beijing Sancheng Zhiyuan Enterprise Management Consulting Co., Ltd.
   Animations Stylesheet - Premium BMW-inspired Effects
   ===================================================== */

/* =====================================================
   Scroll Animations
   ===================================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.fade-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.fade-in-up {
    opacity: 0;
    transform: translateY(50px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.zoom-in {
    opacity: 0;
    transform: scale(0.8);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.slide-in-bottom {
    opacity: 0;
    transform: translateY(100px);
    transition: opacity 0.8s ease, transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.slide-in-bottom.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =====================================================
   Staggered Animations
   ===================================================== */
.stagger-item {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.stagger-item.visible {
    opacity: 1;
    transform: translateY(0);
}

.stagger-item:nth-child(1) { transition-delay: 0.1s; }
.stagger-item:nth-child(2) { transition-delay: 0.2s; }
.stagger-item:nth-child(3) { transition-delay: 0.3s; }
.stagger-item:nth-child(4) { transition-delay: 0.4s; }
.stagger-item:nth-child(5) { transition-delay: 0.5s; }
.stagger-item:nth-child(6) { transition-delay: 0.6s; }
.stagger-item:nth-child(7) { transition-delay: 0.7s; }
.stagger-item:nth-child(8) { transition-delay: 0.8s; }

/* =====================================================
   Hover Animations
   ===================================================== */
.hover-lift {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.hover-lift:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

.hover-scale {
    transition: transform 0.3s ease;
}

.hover-scale:hover {
    transform: scale(1.05);
}

.hover-glow {
    transition: box-shadow 0.3s ease;
}

.hover-glow:hover {
    box-shadow: 0 0 30px rgba(0, 102, 179, 0.3);
}

.hover-rotate {
    transition: transform 0.3s ease;
}

.hover-rotate:hover {
    transform: rotate(5deg) scale(1.02);
}

.hover-flip {
    perspective: 1000px;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.hover-flip:hover {
    transform: rotateY(10deg);
}

/* =====================================================
   Icon Animations
   ===================================================== */
.icon-bounce {
    transition: transform 0.3s ease;
}

.icon-bounce:hover {
    animation: iconBounce 0.5s ease;
}

@keyframes iconBounce {
    0%, 100% { transform: translateY(0); }
    25% { transform: translateY(-10px); }
    50% { transform: translateY(0); }
    75% { transform: translateY(-5px); }
}

.icon-spin {
    transition: transform 0.3s ease;
}

.icon-spin:hover {
    transform: rotate(360deg);
}

.icon-pulse {
    transition: transform 0.3s ease;
}

.icon-pulse:hover {
    animation: iconPulse 0.6s ease infinite;
}

@keyframes iconPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

/* =====================================================
   Text Animations
   ===================================================== */
.text-reveal {
    overflow: hidden;
}

.text-reveal span {
    display: inline-block;
    transform: translateY(100%);
    transition: transform 0.6s cubic-bezier(0.77, 0, 0.175, 1);
}

.text-reveal.visible span {
    transform: translateY(0);
}

.typing-effect {
    overflow: hidden;
    border-right: 3px solid var(--primary-color);
    white-space: nowrap;
    animation: typing 3s steps(40) 1s forwards, blink 0.75s step-end infinite;
}

@keyframes typing {
    from { width: 0; }
    to { width: 100%; }
}

@keyframes blink {
    50% { border-color: transparent; }
}

.text-gradient-animate {
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color), var(--secondary-color), var(--primary-color));
    background-size: 300% 100%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: textGradient 5s linear infinite;
}

@keyframes textGradient {
    0% { background-position: 0% 50%; }
    100% { background-position: 300% 50%; }
}

/* =====================================================
   Background Animations
   ===================================================== */
.bg-move {
    animation: bgMove 20s linear infinite;
}

@keyframes bgMove {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.bg-pulse {
    animation: bgPulse 3s ease-in-out infinite;
}

@keyframes bgPulse {
    0%, 100% { opacity: 0.8; }
    50% { opacity: 1; }
}

.bg-float {
    animation: bgFloat 6s ease-in-out infinite;
}

@keyframes bgFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* =====================================================
   Loading Animations
   ===================================================== */
.loading-dots {
    display: inline-flex;
    gap: 8px;
}

.loading-dots span {
    width: 12px;
    height: 12px;
    background: var(--primary-color);
    border-radius: 50%;
    animation: loadingDot 1.4s ease-in-out infinite both;
}

.loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.loading-dots span:nth-child(2) { animation-delay: -0.16s; }
.loading-dots span:nth-child(3) { animation-delay: 0s; }

@keyframes loadingDot {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

.loading-bar {
    width: 100%;
    height: 4px;
    background: var(--light-gray);
    border-radius: 2px;
    overflow: hidden;
}

.loading-bar-progress {
    height: 100%;
    background: var(--gradient-primary);
    animation: loadingBar 2s ease-in-out infinite;
}

@keyframes loadingBar {
    0% { width: 0%; }
    50% { width: 70%; }
    100% { width: 100%; }
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--light-gray);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

/* =====================================================
   Button Animations
   ===================================================== */
.btn-ripple {
    position: relative;
    overflow: hidden;
}

.btn-ripple::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn-ripple:active::after {
    width: 300px;
    height: 300px;
}

.btn-shine {
    position: relative;
    overflow: hidden;
}

.btn-shine::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    transition: left 0.5s;
}

.btn-shine:hover::before {
    left: 100%;
}

.btn-magnetic {
    transition: transform 0.3s ease;
}

.btn-magnetic:hover {
    transform: scale(1.05);
}

/* =====================================================
   Card Animations
   ===================================================== */
.card-3d {
    perspective: 1000px;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.card-3d-inner {
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.card-3d:hover .card-3d-inner {
    transform: rotateY(10deg) rotateX(5deg);
}

.card-slide {
    overflow: hidden;
}

.card-slide-image {
    transition: transform 0.6s ease;
}

.card-slide:hover .card-slide-image {
    transform: scale(1.1);
}

.card-slide-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    transition: height 0.4s ease;
}

.card-slide:hover .card-slide-overlay {
    height: 100%;
}

.card-flip {
    perspective: 1000px;
}

.card-flip-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s;
    transform-style: preserve-3d;
}

.card-flip:hover .card-flip-inner {
    transform: rotateY(180deg);
}

.card-flip-front,
.card-flip-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
}

.card-flip-back {
    transform: rotateY(180deg);
}

/* =====================================================
   Navigation Animations
   ===================================================== */
.nav-item-line {
    position: relative;
}

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

.nav-item-line:hover::after,
.nav-item-line.active::after {
    width: 100%;
}

.nav-dropdown {
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease, visibility 0.3s;
}

.nav-item-dropdown:hover .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-mobile-toggle span {
    transition: all 0.3s ease;
}

.nav-mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* =====================================================
   Scroll Indicator Animations
   ===================================================== */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollIndicator 2s ease-in-out infinite;
}

@keyframes scrollIndicator {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
    50% { transform: translateX(-50%) translateY(15px); opacity: 0.5; }
}

.scroll-indicator-mouse {
    width: 26px;
    height: 40px;
    border: 2px solid var(--white-color);
    border-radius: 13px;
    position: relative;
}

.scroll-indicator-wheel {
    width: 4px;
    height: 8px;
    background: var(--white-color);
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollWheel 2s ease-in-out infinite;
}

@keyframes scrollWheel {
    0%, 100% { transform: translateX(-50%) translateY(0); opacity: 1; }
    50% { transform: translateX(-50%) translateY(10px); opacity: 0.3; }
}

/* =====================================================
   Parallax Effects
   ===================================================== */
.parallax-slow {
    transform: translateY(calc(var(--scroll-y, 0) * 0.3px));
}

.parallax-medium {
    transform: translateY(calc(var(--scroll-y, 0) * 0.5px));
}

.parallax-fast {
    transform: translateY(calc(var(--scroll-y, 0) * 0.7px));
}

.parallax-reverse {
    transform: translateY(calc(var(--scroll-y, 0) * -0.3px));
}

/* =====================================================
   Counter Animation
   ===================================================== */
.counter {
    display: inline-block;
    font-variant-numeric: tabular-nums;
}

.counter-animated {
    transition: width 1s ease-out;
}

/* =====================================================
   Reveal Animations
   ===================================================== */
.reveal-mask {
    position: relative;
    overflow: hidden;
}

.reveal-mask::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--white-color);
    transform: translateX(0);
    transition: transform 0.8s ease;
}

.reveal-mask.revealed::before {
    transform: translateX(100%);
}

.reveal-overlay {
    position: relative;
}

.reveal-overlay::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-color);
    transform: translateY(100%);
    transition: transform 0.6s ease;
}

.reveal-overlay.revealed::after {
    transform: translateY(0);
}

/* =====================================================
   Modal Animations
   ===================================================== */
.modal {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s;
}

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

.modal-content {
    transform: scale(0.9) translateY(20px);
    transition: transform 0.3s ease;
}

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

/* =====================================================
   Form Animations
   ===================================================== */
.input-focus-glow {
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.input-focus-glow:focus {
    box-shadow: 0 0 0 3px rgba(0, 102, 179, 0.2);
    border-color: var(--primary-color);
}

.input-float-label {
    position: relative;
}

.input-float-label input,
.input-float-label textarea {
    padding-top: 20px;
}

.input-float-label label {
    position: absolute;
    top: 15px;
    left: 15px;
    transition: all 0.3s ease;
    pointer-events: none;
}

.input-float-label input:focus + label,
.input-float-label input:not(:placeholder-shown) + label,
.input-float-label textarea:focus + label,
.input-float-label textarea:not(:placeholder-shown) + label {
    top: 5px;
    font-size: 12px;
    color: var(--primary-color);
}

/* =====================================================
   Timeline Animations
   ===================================================== */
.timeline-animate {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.timeline-animate.visible {
    opacity: 1;
    transform: translateY(0);
}

.timeline-line {
    position: absolute;
    left: 50%;
    width: 4px;
    height: 0;
    background: var(--gradient-primary);
    transition: height 1s ease;
}

.timeline-line.visible {
    height: 100%;
}

/* =====================================================
   Image Gallery Animations
   ===================================================== */
.gallery-item {
    overflow: hidden;
    position: relative;
}

.gallery-item img {
    transition: transform 0.6s ease;
}

.gallery-item:hover img {
    transform: scale(1.1);
}

.gallery-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 102, 179, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.4s ease;
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

/* =====================================================
   Video Animations
   ===================================================== */
.video-play-btn {
    width: 80px;
    height: 80px;
    background: var(--white-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.video-play-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
}

.video-play-btn::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--white-color);
    animation: videoPulse 2s ease-out infinite;
}

@keyframes videoPulse {
    0% { transform: scale(1); opacity: 0.7; }
    100% { transform: scale(1.5); opacity: 0; }
}

/* =====================================================
   Accordion Animations
   ===================================================== */
.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease;
}

.accordion-item.active .accordion-content {
    max-height: 1000px;
}

.accordion-icon {
    transition: transform 0.3s ease;
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

/* =====================================================
   Tab Animations
   ===================================================== */
.tab-content {
    display: none;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}

.tab-content.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

.tab-indicator {
    transition: left 0.3s ease, width 0.3s ease;
}

/* =====================================================
   Special Effects
   ===================================================== */

/* Particle Effect */
.particles {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    pointer-events: none;
}

.particle {
    position: absolute;
    width: 10px;
    height: 10px;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    animation: particleFloat 15s linear infinite;
}

@keyframes particleFloat {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-100vh) rotate(720deg);
        opacity: 0;
    }
}

/* Glow Effect */
.glow-effect {
    animation: glowPulse 2s ease-in-out infinite;
}

@keyframes glowPulse {
    0%, 100% { box-shadow: 0 0 20px rgba(0, 102, 179, 0.3); }
    50% { box-shadow: 0 0 40px rgba(0, 102, 179, 0.6); }
}

/* Marquee Effect */
.marquee {
    display: flex;
    overflow: hidden;
    user-select: none;
}

.marquee-content {
    display: flex;
    animation: marquee 30s linear infinite;
}

@keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* Tilt Effect */
.tilt-effect {
    transform-style: preserve-3d;
    transition: transform 0.3s ease;
}

/* Magnetic Button Effect */
.magnetic-btn {
    transition: transform 0.2s ease;
}

/* Text Split Animation */
.split-text .char {
    display: inline-block;
    opacity: 0;
    transform: translateY(100%);
    transition: opacity 0.5s ease, transform 0.5s ease;
}

.split-text.visible .char {
    opacity: 1;
    transform: translateY(0);
}

/* Image Reveal */
.image-reveal {
    position: relative;
    overflow: hidden;
}

.image-reveal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--white-color);
    transform-origin: left;
    transition: transform 0.8s ease;
}

.image-reveal.revealed::before {
    transform: scaleX(0);
}

/* Border Draw Animation */
.border-draw {
    position: relative;
}

.border-draw::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0;
    height: 0;
    border: 3px solid transparent;
    transition: all 0.4s ease;
}

.border-draw:hover::before {
    width: 100%;
    height: 100%;
    border-top-color: var(--primary-color);
    border-right-color: var(--primary-color);
}

.border-draw::after {
    content: '';
    position: absolute;
    bottom: 0;
    right: 0;
    width: 0;
    height: 0;
    border: 3px solid transparent;
    transition: all 0.4s ease;
}

.border-draw:hover::after {
    width: 100%;
    height: 100%;
    border-bottom-color: var(--primary-color);
    border-left-color: var(--primary-color);
}

/* Morphing Animation */
.morphing {
    animation: morphing 3s ease-in-out infinite;
}

@keyframes morphing {
    0%, 100% { border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%; }
    50% { border-radius: 30% 60% 70% 40% / 50% 60% 30% 60%; }
}