* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    padding-bottom: 80px;
}

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

header {
    background-color: #0076db;
    color: white;
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    display: flex;
    align-items: center;
}

.logo i {
    margin-right: 10px;
    font-size: 28px;
}

.announcement {
    background-color: #fff;
    margin: 20px 0;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.announcement h2 {
    color: #0076db;
    margin-bottom: 15px;
    font-size: 18px;
}

.announcement-list {
    position: relative;
}

.announcement-item {
    width: 100%;
}

.announcement-item strong {
    color: #e53935;
}

.section {
    background-color: #fff;
    margin: 20px 0;
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.section h2 {
    color: #0076db;
    margin-bottom: 20px;
    font-size: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid #eee;
}

.tool-container {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.button-group {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.input-group {
    flex: 1;
    min-width: 160px;
}

.input-group input {
    width: 100%;
    padding: 10px 15px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.input-group.extract-code {
    flex: 0 0 130px;
    min-width: 130px;
}

.btn,
a.btn {
    padding: 10px 15px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s;
    background: none;
    outline: none;
    user-select: none;
}

a.btn:focus {
    outline: 2px solid #0076db;
}

.btn i,
a.btn i {
    margin-right: 5px;
}

.btn-primary,
a.btn.btn-primary {
    background-color: #0076db;
    color: white;
}

.btn-primary:hover,
a.btn.btn-primary:hover {
    background-color: #005baa;
}

.btn-secondary,
a.btn.btn-secondary {
    background-color: #f0f0f0;
    color: #333;
}

.btn-secondary:hover,
a.btn.btn-secondary:hover {
    background-color: #e0e0e0;
}

.hint {
    text-align: center;
    margin: 15px 0;
    color: #666;
}

.collapsible {
    background-color: #f5f5f5;
    color: #333;
    cursor: pointer;
    padding: 15px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 16px;
    border-radius: 4px;
    margin-bottom: 10px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.collapsible:after {
    content: '\f078';
    font-family: 'FontAwesome';
    transition: transform 0.3s;
}

.active:after {
    transform: rotate(180deg);
}

.content {
    padding: 0 15px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.2s ease-out;
    background-color: white;
}

.password-table {
    width: 100%;
    border-collapse: collapse;
    margin: 15px 0;
}

.password-table th {
    color: #ff9800;
    padding: 12px;
    text-align: left;
    border-bottom: 2px solid #f0f0f0;
}

.password-table td {
    padding: 12px;
    border-bottom: 1px solid #f0f0f0;
}

.qr-container {
    text-align: center;
    margin: 20px 0;
}

.qr-image {
    max-width: 200px;
    height: auto;
    border: 1px solid #eee;
    padding: 10px;
    border-radius: 4px;
}

.button-center {
    text-align: center;
    margin: 20px 0;
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.help-text {
    margin-bottom: 15px;
    line-height: 1.8;
}

.link,
a {
    color: #0076db;
    text-decoration: none;
}

.link:hover,
a:hover {
    text-decoration: underline;
}

a.btn:hover,
a.btn:active {
    text-decoration: none;
}

.divider {
    height: 1px;
    background-color: #eee;
    margin: 20px 0;
}

footer {
    background-color: #f0f0f0;
    padding: 20px 0;
    margin-top: 30px;
    text-align: center;
    color: #666;
    font-size: 14px;
    position: static;
    width: 100%;
}

.float-button {
    position: fixed;
    right: 20px;
    z-index: 100;
    width: 40px;
    height: 40px;
    transition: width 0.3s ease;
    overflow: hidden;
    border-radius: 20px;
}

#qrButton {
    bottom: 20px;
}

#topButton {
    bottom: 70px;
}

.float-button.active {
    width: 160px;
}

.float-button:hover {
    width: 160px;
}

.float-btn {
    width: 40px;
    height: 40px;
    background-color: #0076db;
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    right: 0;
    top: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
    z-index: 2;
}

.float-content {
    position: absolute;
    right: 0;
    top: 0;
    height: 40px;
    display: flex;
    align-items: center;
    padding-right: 45px;
    background-color: #0076db;
    color: white;
    border-radius: 20px;
    white-space: nowrap;
    z-index: 1;
    transition: opacity 0.3s ease;
    opacity: 0;
}

.float-button.active .float-content,
.float-button:hover .float-content {
    opacity: 1;
}

.wechat-qr-container {
    position: fixed;
    right: 20px;
    bottom: 80px;
    z-index: 999;
    display: none;
    opacity: 0;
    transition: opacity 0.3s ease, transform 0.3s ease;
    transform-origin: bottom right;
    transform: scale(0.95);
}

.wechat-qr-container .wechat-qr-content {
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    padding: 10px 10px 5px 10px;
    text-align: center;
}

.wechat-qr-image {
    width: 160px;
    height: 160px;
    border: 5px solid white;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    margin-bottom: 8px;
}

.wechat-qr-text {
    font-size: 15px;
    color: #0076db;
    margin-bottom: 2px;
}

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.4);
}

.modal-content {
    background-color: #fefefe;
    margin: 15% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 80%;
    max-width: 500px;
    border-radius: 8px;
    position: relative;
    animation: modalFadeIn 0.3s;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
        transform: translateY(-50px);
    }

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

.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    position: absolute;
    right: 20px;
    top: 10px;
}

.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
}

.modal-body {
    margin-top: 20px;
    margin-bottom: 20px;
}

.modal-footer {
    text-align: center;
    padding-top: 15px;
    border-top: 1px solid #eee;
}

@media (max-width: 768px) {
    .section {
        padding: 10px !important;
        /* 原来是25px，改小一点 */
    }

    .tool-container {
        gap: 0 !important;
        /* 间距为0，彻底去掉空白 */
        margin-bottom: 10px !important;
    }

    .input-group,
    .input-group.extract-code {
        min-width: 0 !important;
        width: 100% !important;
        margin-bottom: 5px !important;
    }

    .button-group {
        gap: 5px !important;
        margin-top: 0 !important;
        justify-content: center !important;
        /* 新增：按钮居中 */
        width: 100%;
        display: flex;
    }
}

/* button */
.btn-green,
a.btn.btn-green {
    background-color: #4CAF50;
    color: white;
}

.btn-green:hover,
a.btn.btn-green:hover {
    background-color: #45a049;
    /* 深绿色（ hover 效果） */
}