* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Microsoft YaHei', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #fff;
    overflow-x: hidden;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: #4a90d9;
}

ul {
    list-style: none;
}

.clear::after {
    content: "";
    display: table;
    clear: both;
}

.fl_left {
    float: left;
}

.fl_right {
    float: right;
}

.center {
    text-align: center;
}

.hoc {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.bgded {
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    position: relative;
    overflow: hidden;
}

.bgded::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(255, 255, 255, 0.1) 0%, transparent 40%);
    pointer-events: none;
}

.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: float 15s infinite ease-in-out;
}

.particle:nth-child(1) { left: 10%; top: 20%; animation-delay: 0s; animation-duration: 12s; }
.particle:nth-child(2) { left: 20%; top: 80%; animation-delay: 2s; animation-duration: 14s; }
.particle:nth-child(3) { left: 30%; top: 40%; animation-delay: 4s; animation-duration: 16s; }
.particle:nth-child(4) { left: 40%; top: 60%; animation-delay: 1s; animation-duration: 13s; }
.particle:nth-child(5) { left: 50%; top: 30%; animation-delay: 3s; animation-duration: 15s; }
.particle:nth-child(6) { left: 60%; top: 70%; animation-delay: 5s; animation-duration: 11s; }
.particle:nth-child(7) { left: 70%; top: 50%; animation-delay: 2s; animation-duration: 17s; }
.particle:nth-child(8) { left: 80%; top: 20%; animation-delay: 4s; animation-duration: 14s; }
.particle:nth-child(9) { left: 90%; top: 80%; animation-delay: 1s; animation-duration: 12s; }
.particle:nth-child(10) { left: 15%; top: 50%; animation-delay: 3s; animation-duration: 16s; }

@keyframes float {
    0%, 100% {
        transform: translateY(0) translateX(0) scale(1);
        opacity: 0.3;
    }
    25% {
        transform: translateY(-30px) translateX(10px) scale(1.2);
        opacity: 0.5;
    }
    50% {
        transform: translateY(-20px) translateX(-10px) scale(0.8);
        opacity: 0.4;
    }
    75% {
        transform: translateY(-40px) translateX(5px) scale(1.1);
        opacity: 0.6;
    }
}

.overlay {
    position: relative;
}

.overlay::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.4) 100%);
    z-index: 0;
}

.overlay > * {
    position: relative;
    z-index: 1;
}

.wrapper {
    display: block;
    width: 100%;
}

.row1 {
    background-color: transparent;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
}

.row3 {
    padding: 100px 0;
    background: linear-gradient(180deg, #f8fafc 0%, #e2e8f0 100%);
    position: relative;
}

.row3::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2, #f093fb, #764ba2, #667eea);
    background-size: 200% 100%;
    animation: gradientMove 3s linear infinite;
}

@keyframes gradientMove {
    0% { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

.row5 {
    padding: 40px 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #fff;
    position: relative;
}

.row5::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.5), transparent);
}

#header {
    padding: 25px 0;
}

#header #logo h1 {
    font-size: 32px;
    font-weight: 700;
}

#header #logo a {
    color: #fff;
    text-transform: uppercase;
    letter-spacing: 3px;
    background: linear-gradient(135deg, #fff 0%, #e0e7ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all 0.3s ease;
}

#header #logo a:hover {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

#mainav ul {
    display: flex;
    gap: 40px;
}

#mainav ul li a {
    color: #fff;
    font-weight: 500;
    padding: 12px 20px;
    position: relative;
    border-radius: 25px;
    transition: all 0.3s ease;
}

#mainav ul li a::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 25px;
    opacity: 0;
    transition: opacity 0.3s ease;
}

#mainav ul li a:hover::before,
#mainav ul li.active a::before {
    opacity: 1;
}

#mainav ul li a::after {
    display: none;
}

#pageintro {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 20px;
}

#pageintro article {
    color: #fff;
    max-width: 900px;
    animation: fadeInUp 1s ease-out;
}

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

#pageintro .heading {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 25px;
    text-shadow: 2px 4px 8px rgba(0, 0, 0, 0.3);
    letter-spacing: 2px;
}

#pageintro .underline {
    display: inline-block;
    position: relative;
    padding-bottom: 20px;
}

#pageintro .underline::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, #f093fb, #f5576c);
    border-radius: 2px;
}

#pageintro p {
    font-size: 22px;
    opacity: 0.95;
    letter-spacing: 1px;
}

.btmspace-80 {
    margin-bottom: 80px;
}

.heading {
    font-weight: 600;
    color: #1a1a2e;
}

.font-x2 {
    font-size: 36px;
    position: relative;
    display: inline-block;
}

.font-x2::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    border-radius: 2px;
}

.group {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
}

.overview {
    justify-content: center;
}

.one_quarter {
    flex: 0 0 calc(25% - 22.5px);
    max-width: calc(25% - 22.5px);
}

.overview li {
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInCard 0.6s ease-out forwards;
}

.overview li:nth-child(1) { animation-delay: 0.1s; }
.overview li:nth-child(2) { animation-delay: 0.2s; }
.overview li:nth-child(3) { animation-delay: 0.3s; }
.overview li:nth-child(4) { animation-delay: 0.4s; }

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

.overview li article {
    background: #fff;
    padding: 45px 30px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    height: 100%;
    position: relative;
    overflow: hidden;
}

.overview li article::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2, #f093fb);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.overview li article:hover::before {
    opacity: 1;
}

.overview li article:hover {
    transform: translateY(-15px) scale(1.02);
    box-shadow: 0 25px 60px rgba(102, 126, 234, 0.2);
}

.overview li article .step-number {
    position: absolute;
    top: 15px;
    right: 20px;
    font-size: 48px;
    font-weight: 800;
    color: rgba(102, 126, 234, 0.1);
    line-height: 1;
}

.overview li article a:first-child {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 90px;
    height: 90px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    font-size: 36px;
    margin-bottom: 25px;
    transition: all 0.4s ease;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
}

.overview li article:hover a:first-child {
    transform: scale(1.15) rotate(10deg);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.4);
}

.overview li article h6 {
    font-size: 22px;
    margin-bottom: 15px;
}

.overview li article h6 a {
    color: #1a1a2e;
    transition: color 0.3s ease;
}

.overview li article h6 a:hover {
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.overview li article p {
    color: #64748b;
    font-size: 15px;
    line-height: 1.9;
}

#copyright {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

#copyright p {
    font-size: 14px;
    opacity: 0.7;
    transition: opacity 0.3s ease;
}

#copyright p:hover {
    opacity: 1;
}

#copyright a {
    color: #a5b4fc;
    transition: color 0.3s ease;
}

#copyright a:hover {
    color: #f093fb;
}

#backtotop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 55px;
    height: 55px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border-radius: 50%;
    font-size: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 999;
    cursor: pointer;
    box-shadow: 0 10px 30px rgba(102, 126, 234, 0.4);
}

#backtotop.visible {
    opacity: 1;
    visibility: visible;
}

#backtotop:hover {
    transform: translateY(-8px) scale(1.1);
    box-shadow: 0 15px 40px rgba(102, 126, 234, 0.5);
}

@media screen and (max-width: 992px) {
    .one_quarter {
        flex: 0 0 calc(50% - 15px);
        max-width: calc(50% - 15px);
    }
    
    #pageintro .heading {
        font-size: 42px;
    }
    
    .overview li article .step-number {
        font-size: 36px;
    }
}

@media screen and (max-width: 768px) {
    #header {
        text-align: center;
    }
    
    #header #logo,
    #header #mainav {
        float: none;
    }
    
    #header #logo {
        margin-bottom: 15px;
    }
    
    #mainav ul {
        justify-content: center;
        gap: 20px;
    }
    
    #mainav ul li a {
        padding: 10px 15px;
        font-size: 14px;
    }
    
    #pageintro .heading {
        font-size: 32px;
    }
    
    #pageintro p {
        font-size: 18px;
    }
    
    .font-x2 {
        font-size: 28px;
    }
    
    .row3 {
        padding: 60px 0;
    }
    
    .btmspace-80 {
        margin-bottom: 50px;
    }
    
    .overview li article {
        padding: 35px 25px;
    }
    
    .overview li article a:first-child {
        width: 75px;
        height: 75px;
        font-size: 30px;
    }
}

@media screen and (max-width: 576px) {
    .one_quarter {
        flex: 0 0 100%;
        max-width: 100%;
    }
    
    #copyright {
        flex-direction: column;
        text-align: center;
    }
    
    #pageintro .heading {
        font-size: 28px;
    }
    
    .overview li article .step-number {
        font-size: 30px;
    }
}