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

body {
    font-family: "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
    background-color: #e8f5e9;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    position: relative;
    overflow: hidden;
}

#particles-js {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: -1;
}

.card {
    background: rgba(255, 255, 255, 0.9);
    border-radius: 20px;
    overflow: hidden;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 30px rgba(76, 175, 80, 0.1);
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.5s ease-out forwards;
    backdrop-filter: blur(10px);
}

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

.card-header {
    background: linear-gradient(135deg, #4CAF50, #81C784);
    color: white;
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

.card-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 0.5rem;
    position: relative;
    z-index: 1;
}

.card-header p {
    font-size: 0.875rem;
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
    position: relative;
    z-index: 1;
}

.card-content {
    padding: 2rem;
}

.input-wrapper {
    position: relative;
    margin-bottom: 1rem;
}

input {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid #A5D6A7;
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background-color: rgba(255, 255, 255, 0.8);
}

input:focus {
    outline: none;
    border-color: #4CAF50;
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.1);
}

.input-hint {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: #81C784;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

button {
    width: 100%;
    padding: 0.75rem 1rem;
    background: linear-gradient(135deg, #4CAF50, #81C784);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

button:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

button:active {
    transform: translateY(0);
}

.privilege-list {
    /* margin-top: 2rem; */
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.5s ease, opacity 0.5s ease;
}

.privilege-list.show {
    max-height: 1000px;
    opacity: 1;
}

.privilege-list h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: #2E7D32;
}

.privilege-item {
    padding: 1rem;
    border: 2px solid #A5D6A7;
    border-radius: 10px;
    margin-bottom: 0.75rem;
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(10px);
    background-color: rgba(255, 255, 255, 0.8);
}

.privilege-list.show .privilege-item {
    animation: slideIn 0.3s ease-out forwards;
}

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

.privilege-list.show .privilege-item:nth-child(2) { animation-delay: 0.1s; }
.privilege-list.show .privilege-item:nth-child(3) { animation-delay: 0.2s; }
.privilege-list.show .privilege-item:nth-child(4) { animation-delay: 0.3s; }

.privilege-item:hover {
    border-color: #4CAF50;
    box-shadow: 0 2px 10px rgba(76, 175, 80, 0.1);
}

.privilege-item h3 {
    font-size: 1rem;
    font-weight: 600;
    color: #2E7D32;
    margin-bottom: 0.25rem;
}

.privilege-item p {
    font-size: 0.875rem;
    color: #388E3C;
}

.privilege-item.selected {
    border-color: #4CAF50;
    background-color: rgba(76, 175, 80, 0.05);
}

.hidden {
    display: none;
}

.fade-out {
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

#backButton {
    margin-top: 1rem;
    background: transparent;
    border: 2px solid #4CAF50;
    color: #4CAF50;
}

#backButton:hover {
    background: rgba(76, 175, 80, 0.1);
}