*,
*::before,
*::after {
    box-sizing: border-box
}

body,
html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: "微软雅黑", Arial, sans-serif;
    background: url('https://img.xihuannio.cn/uploads/2025/08/03/978611069.png') no-repeat center center fixed;
    background-size: cover;
    overflow-x: hidden;
    opacity: 0;
    animation: fadeIn 1s forwards
}

@keyframes fadeIn {
    to {
        opacity: 1
    }
}

.container {
    background: rgba(255, 255, 255, 0.25);
    max-width: 600px;
    margin: 40px auto;
    border-radius: 16px;
    padding: 30px 25px;
    box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.18);
    opacity: 0;
    transform: scale(0.95);
    animation: popIn 0.6s forwards 0.5s
}

@keyframes popIn {
    to {
        opacity: 1;
        transform: scale(1)
    }
}

h1 {
    margin: 0 0 20px 0;
    font-weight: 700;
    color: #2c3e50;
    user-select: none;
    text-shadow: 0 0 4px rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    font-size: 40px;
    justify-content: center
}

h2 {
    margin: 0 0 20px 0;
    font-weight: 700;
    color: #2c3e50;
    user-select: none;
    text-shadow: 0 0 4px rgba(255, 255, 255, 0.7);
    display: flex;
    align-items: center;
    font-size: 25px;
    justify-content: center
}

.logo {
    width: 85px;
    height: 85px;
    margin-right: 12px;
    user-select: none
}

label {
    display: block;
    text-align: left;
    font-weight: 600;
    margin-top: 20px;
    color: #34495e;
    user-select: none
}

textarea {
    width: 100%;
    height: 120px;
    margin-top: 8px;
    padding: 15px 20px;
    font-size: 16px;
    border-radius: 14px;
    border: 2px solid #a3c4f3;
    box-shadow: 0 4px 10px rgba(163, 196, 243, 0.4);
    transition: all 0.3s ease;
    font-family: "微软雅黑", Arial, sans-serif;
    background-color: rgba(255, 255, 255, 0.85);
    resize: vertical;
    box-sizing: border-box
}

textarea:focus {
    outline: none;
    border-color: #2e86de;
    box-shadow: 0 6px 20px rgba(46, 134, 222, 0.6);
    background-color: #f0f8ff
}

.btn-group {
    margin-top: 25px;
    display: flex;
    justify-content: center;
    gap: 20px
}

button {
    padding: 14px 32px;
    font-size: 18px;
    font-weight: 600;
    color: #fff;
    background: linear-gradient(135deg, #4a90e2 0%, #357ABD 100%);
    border: none;
    border-radius: 35px;
    cursor: pointer;
    box-shadow: 0 7px 16px rgba(53, 122, 189, 0.6);
    transition: all 0.25s ease;
    user-select: none;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.2))
}

button:hover {
    background: linear-gradient(135deg, #357ABD 0%, #2a5d9f 100%);
    box-shadow: 0 10px 25px rgba(41, 105, 160, 0.85);
    transform: translateY(-3px)
}

button:active {
    transform: translateY(0);
    box-shadow: 0 5px 12px rgba(53, 122, 189, 0.5)
}

@media(max-width:480px) {
    .container {
        margin: 20px 10px;
        padding: 20px 15px
    }

    textarea {
        height: 100px;
        font-size: 14px;
        padding: 14px 16px
    }

    button {
        flex: 1;
        font-size: 16px;
        padding: 12px 0
    }

    .btn-group {
        flex-direction: column;
        gap: 14px
    }

    h1 {
        font-size: 24px
    }

    .logo {
        width: 85px;
        height: 85px;
        margin-right: 12px
    }
}

.collapse-card {
    background: rgba(255, 255, 255, 0.3);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.4);
    padding: 16px 20px;
    margin-top: 15px;
    box-shadow: 0 4px 12px rgba(31, 38, 135, 0.2);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    user-select: none;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    overflow: hidden;
    transition: padding 0.35s ease
}

.collapse-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 700;
    font-size: 18px;
    color: #2c3e50;
    text-shadow: 0 0 4px rgba(255, 255, 255, 0.7);
    user-select: none
}

.collapse-header:focus {
    outline: 3px solid #4a90e2;
    outline-offset: 3px
}

.collapse-icon {
    font-weight: 900;
    font-size: 22px;
    user-select: none;
    transition: transform 0.3s ease
}

.collapse-content {
    font-size: 15px;
    line-height: 1.5;
    color: #34495e;
    user-select: text;
    max-height: 0;
    opacity: 0;
    transition: max-height 0.5s ease, opacity 0.4s ease 0.15s;
    overflow: hidden;
    margin-top: 12px
}

.expanded .collapse-content {
    max-height: 1000px;
    opacity: 1
}

.expanded .collapse-icon {
    transform: rotate(-90deg)
}

@media(max-width:480px) {
    .collapse-card {
        padding: 12px 16px;
        margin-top: 10px
    }

    .collapse-header {
        font-size: 16px
    }

    .collapse-content {
        font-size: 14px
    }
}