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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    background: #f0f2f5;
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

.container {
    max-width: 900px;
    margin: 0 auto;
}

/* 顶部导航样式 */
.top-nav {
    background: white;
    border-radius: 8px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
    padding: 12px 24px;
}

.top-nav ul {
    list-style: none;
    display: flex;
    gap: 8px;
    justify-content: center;
    align-items: center;
}

.top-nav li {
    margin: 0;
}

.top-nav a {
    display: block;
    padding: 10px 20px;
    color: #050505;
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    border-radius: 6px;
    transition: all 0.2s;
    position: relative;
}

.top-nav a:hover {
    background: #f0f2f5;
    color: #1877f2;
}

.top-nav a.active {
    background: #e7f3ff;
    color: #1877f2;
    font-weight: 600;
}

.top-nav a.active::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 40%;
    height: 3px;
    background: #1877f2;
    border-radius: 2px 2px 0 0;
}

/* 头部样式 */
header {
    text-align: center;
    background: white;
    padding: 30px 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

header h1 {
    font-size: 2em;
    color: #1877f2;
    margin-bottom: 8px;
    font-weight: 600;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 0.95em;
    color: #65676b;
    font-weight: 400;
}

/* 搜索区域 */
.search-section {
    background: white;
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.search-box {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
}

#ipInput {
    flex: 1;
    padding: 10px 12px;
    font-size: 15px;
    border: 1px solid #dddfe2;
    border-radius: 6px;
    outline: none;
    transition: all 0.2s;
    background: #f0f2f5;
    color: #050505;
}

#ipInput:focus {
    background: white;
    border-color: #1877f2;
    box-shadow: 0 0 0 2px rgba(24, 119, 242, 0.1);
}

#ipInput::placeholder {
    color: #8a8d91;
}

button {
    padding: 8px 16px;
    font-size: 14px;
    font-weight: 600;
    background: #1877f2;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
    white-space: nowrap;
}

button:hover {
    background: #166fe5;
}

button:active {
    background: #1564d6;
    transform: scale(0.98);
}

.btn-icon {
    font-size: 1em;
}

.quick-actions {
    display: flex;
    justify-content: center;
}

.btn-secondary {
    background: #e4e6eb;
    color: #050505;
}

.btn-secondary:hover {
    background: #d8dadf;
}

.btn-secondary:active {
    background: #ced0d4;
}

/* 加载动画 */
.loading {
    background: white;
    border-radius: 8px;
    padding: 32px;
    text-align: center;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.loading p {
    color: #1877f2;
}

.spinner {
    width: 40px;
    height: 40px;
    margin: 0 auto 16px;
    border: 3px solid #e4e6eb;
    border-top: 3px solid #1877f2;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 错误提示 */
.error {
    background: #ffebe9;
    border: 1px solid #f02849;
    color: #c41c00;
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
    text-align: center;
    font-size: 0.9em;
}

/* IP信息显示 */
.ip-info {
    background: white;
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
    animation: fadeIn 0.3s;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.info-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid #e4e6eb;
}

.info-header h2 {
    color: #050505;
    font-size: 1.6em;
    font-weight: 600;
}

.ip-type {
    padding: 6px 12px;
    background: #e7f3ff;
    color: #1877f2;
    border-radius: 6px;
    font-size: 0.85em;
    font-weight: 600;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.info-item {
    padding: 16px;
    background: #f0f2f5;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: all 0.2s;
}

.info-item:hover {
    background: #e4e6eb;
}

.info-label {
    font-size: 0.85em;
    color: #65676b;
    font-weight: 600;
}

.info-value {
    font-size: 1em;
    color: #050505;
    font-weight: 500;
    word-break: break-all;
}

/* 地图容器 */
.map-container {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid #e4e6eb;
}

.map-container h3 {
    color: #050505;
    margin-bottom: 12px;
    font-size: 1.2em;
    font-weight: 600;
}

.map-link {
    padding: 12px;
    background: #f0f2f5;
    border-radius: 6px;
    font-size: 0.9em;
}

.map-link p {
    color: #65676b;
    margin-bottom: 8px;
}

.map-link a {
    color: #1877f2;
    text-decoration: none;
    font-weight: 600;
}

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

/* 使用说明 */
.instructions {
    background: white;
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.instructions h3 {
    color: #1877f2;
    margin-bottom: 16px;
    font-size: 1.3em;
    font-weight: 600;
}

.instructions ul {
    list-style-position: inside;
    margin-bottom: 16px;
    color: #65676b;
    font-size: 0.9em;
    line-height: 1.8;
}

.instructions li {
    padding: 4px 0;
    color: #050505;
}

.api-notice {
    background: #fff3cd;
    border: 1px solid #ffc107;
    padding: 12px;
    border-radius: 6px;
    font-size: 0.9em;
    color: #856404;
}

.api-notice strong {
    color: #050505;
}

.api-notice a {
    color: #1877f2;
    text-decoration: none;
    font-weight: 600;
}

.api-notice a:hover {
    text-decoration: underline;
}

/* 页脚 */
footer {
    text-align: center;
    padding: 20px 0;
    color: #65676b;
    font-size: 0.85em;
}

footer p {
    margin: 4px 0;
}

footer a {
    color: #1877f2;
    text-decoration: none;
    font-weight: 600;
}

footer a:hover {
    text-decoration: underline;
}

/* 内容页面样式 (关于页面和隐私政策页面) */
.content-section {
    background: white;
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    margin-bottom: 20px;
}

.content-section p {
    color: #050505;
    margin-bottom: 12px;
    line-height: 1.8;
}

.content-section h2 {
    color: #1877f2;
    margin: 24px 0 16px 0;
    font-size: 1.4em;
    font-weight: 600;
}

.content-section h3 {
    color: #050505;
    margin: 16px 0 12px 0;
    font-size: 1.1em;
    font-weight: 600;
}

.content-section h4 {
    color: #050505;
    margin: 12px 0 8px 0;
    font-size: 1em;
    font-weight: 600;
}

.content-section ul {
    margin: 12px 0 16px 24px;
    line-height: 1.8;
}

.content-section li {
    color: #050505;
    margin: 8px 0;
}

.content-section a {
    color: #1877f2;
    text-decoration: none;
    font-weight: 600;
}

.content-section a:hover {
    text-decoration: underline;
}

.policy-section,
.about-section {
    margin-bottom: 32px;
}

.last-updated {
    color: #65676b;
    font-size: 0.9em;
    margin-bottom: 24px;
    padding: 12px;
    background: #f0f2f5;
    border-radius: 6px;
}

.policy-notice,
.disclaimer {
    background: #fff3cd;
    border: 1px solid #ffc107;
    padding: 16px;
    border-radius: 6px;
    margin: 16px 0;
}

.policy-notice p,
.disclaimer ul {
    color: #856404;
    margin: 0;
}

.policy-notice strong {
    color: #050505;
}

.back-link {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid #e4e6eb;
    text-align: center;
}

.back-link a {
    display: inline-block;
    padding: 10px 24px;
    background: #e4e6eb;
    color: #050505;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.2s;
}

.back-link a:hover {
    background: #d8dadf;
}

/* 功能网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 16px;
    margin: 20px 0;
}

.feature-item {
    padding: 20px;
    background: #f0f2f5;
    border-radius: 8px;
    text-align: center;
    transition: all 0.2s;
}

.feature-item:hover {
    background: #e4e6eb;
    transform: translateY(-2px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.feature-icon {
    font-size: 2em;
    margin-bottom: 12px;
}

.feature-item h3 {
    color: #1877f2;
    font-size: 1.1em;
    margin: 12px 0 8px 0;
}

.feature-item p {
    color: #65676b;
    font-size: 0.9em;
    margin: 0;
}

/* 使用场景列表 */
.use-cases {
    list-style: none;
    margin: 16px 0;
    padding: 0;
}

.use-cases li {
    padding: 12px;
    background: #f0f2f5;
    border-radius: 6px;
    margin-bottom: 12px;
}

.use-cases strong {
    color: #1877f2;
}

/* 更新日志 */
.changelog {
    margin: 16px 0;
}

.changelog-item {
    padding: 16px;
    background: #f0f2f5;
    border-radius: 6px;
    margin-bottom: 16px;
    border-left: 4px solid #1877f2;
}

.changelog-item h4 {
    color: #1877f2;
    margin-top: 0;
}

.changelog-item ul {
    margin: 8px 0 0 20px;
}

/* 语言切换器 */
.language-switcher {
    text-align: right;
    margin-bottom: 10px;
}

.language-switcher button {
    background: white;
    border: 1px solid #ddd;
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.language-switcher button:hover {
    background: #f0f2f5;
    border-color: #1877f2;
}

/* 统计面板 */
.stats-panel {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #1877f2 0%, #166fe5 100%);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(24, 119, 242, 0.3);
}

.stats-item {
    background: rgba(255, 255, 255, 0.15);
    padding: 20px 15px;
    border-radius: 10px;
    text-align: center;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.stats-item:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-3px);
}

.stats-number {
    display: block;
    font-size: 2.2em;
    font-weight: 700;
    color: white;
    margin-bottom: 8px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.stats-label {
    font-size: 0.9em;
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
}

/* 查询历史 */
.history-section {
    background: white;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    border: 1px solid #e4e6eb;
}

.history-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid #f0f2f5;
}

.history-header h3 {
    color: #1c1e21;
    font-size: 1.2em;
    font-weight: 600;
}

.btn-clear {
    background: transparent;
    color: #e74c3c;
    border: 1px solid #e74c3c;
    padding: 8px 16px;
    font-size: 13px;
    border-radius: 20px;
    transition: all 0.2s;
}

.btn-clear:hover {
    background: #e74c3c;
    color: white;
    transform: translateY(-1px);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 18px;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.25s ease;
    border: 1px solid #e4e6eb;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
}

.history-item:hover {
    background: linear-gradient(135deg, #e7f3ff 0%, #f0f7ff 100%);
    border-color: #1877f2;
    transform: translateX(5px);
    box-shadow: 0 3px 10px rgba(24, 119, 242, 0.15);
}

.history-ip {
    font-weight: 700;
    color: #1877f2;
    font-family: 'Courier New', monospace;
    font-size: 1.05em;
    min-width: 120px;
}

.history-location {
    color: #65676b;
    font-size: 0.9em;
    flex: 1;
    margin: 0 15px;
    text-align: center;
    font-weight: 500;
}

.history-time {
    font-size: 0.8em;
    color: #8c939d;
    background: #f0f2f5;
    padding: 4px 10px;
    border-radius: 12px;
    font-weight: 500;
}

/* 内嵌地图 */
.embedded-map {
    margin-top: 15px;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid #ddd;
}

.embedded-map iframe {
    display: block;
    border: none;
}

/* 操作按钮 */
.action-buttons {
    display: flex;
    gap: 12px;
    margin-top: 25px;
    flex-wrap: wrap;
}

.btn-action {
    flex: 1;
    min-width: 120px;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    color: #1c1e21;
    border: 1px solid #e4e6eb;
    padding: 14px 22px;
    font-size: 14px;
    border-radius: 10px;
    font-weight: 500;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
    transition: all 0.25s ease;
}

.btn-action:hover {
    background: linear-gradient(135deg, #e7f3ff 0%, #f0f7ff 100%);
    border-color: #1877f2;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(24, 119, 242, 0.2);
}

/* 热门查询 */
.popular-section {
    background: white;
    border-radius: 12px;
    padding: 25px;
    margin-bottom: 20px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    border: 1px solid #e4e6eb;
}

.popular-section h3 {
    color: #1c1e21;
    font-size: 1.2em;
    margin-bottom: 20px;
    font-weight: 600;
    padding-bottom: 15px;
    border-bottom: 2px solid #f0f2f5;
}

.popular-list {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.popular-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 18px;
    background: linear-gradient(135deg, #fff5f5 0%, #ffe8e8 100%);
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.25s ease;
    border: 1px solid #ffcdd2;
    box-shadow: 0 2px 5px rgba(231, 76, 60, 0.1);
}

.popular-item:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 6px 15px rgba(231, 76, 60, 0.25);
    border-color: #e74c3c;
}

.popular-ip {
    font-weight: 700;
    color: #e74c3c;
    font-family: 'Courier New', monospace;
    font-size: 0.95em;
}

.popular-count {
    font-size: 0.75em;
    color: #e74c3c;
    background: white;
    padding: 3px 10px;
    border-radius: 12px;
    font-weight: 600;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* Toast提示 */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #333;
    color: white;
    padding: 12px 24px;
    border-radius: 25px;
    font-size: 14px;
    z-index: 1000;
    opacity: 0;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 12px;
    }

    /* 统计面板移动端 */
    .stats-panel {
        grid-template-columns: repeat(3, 1fr);
        gap: 10px;
        padding: 15px;
    }

    .stats-item {
        padding: 15px 8px;
    }

    .stats-number {
        font-size: 1.6em;
    }

    .stats-label {
        font-size: 0.75em;
    }

    /* 导航移动端适配 */
    .top-nav {
        padding: 10px 16px;
    }

    .top-nav ul {
        gap: 6px;
        flex-wrap: wrap;
    }

    .top-nav a {
        padding: 8px 16px;
        font-size: 14px;
    }

    .top-nav a.active::after {
        width: 60%;
        height: 2px;
    }

    header {
        padding: 20px 16px;
    }

    header h1 {
        font-size: 1.6em;
    }

    .search-section {
        padding: 16px;
    }

    .search-box {
        flex-direction: column;
    }

    button {
        width: 100%;
        justify-content: center;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }

    .info-header {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    /* 历史记录移动端 */
    .history-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }

    .history-location {
        text-align: left;
        margin: 0;
    }

    /* 操作按钮移动端 */
    .action-buttons {
        flex-direction: column;
    }

    .btn-action {
        width: 100%;
    }

    .instructions {
        padding: 16px;
    }

    /* 内容页面移动端优化 */
    .content-section {
        padding: 16px;
    }

    .content-section h2 {
        font-size: 1.2em;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .feature-item {
        padding: 16px;
    }
}

@media (max-width: 480px) {
    /* 小屏幕导航优化 */
    .top-nav {
        padding: 8px 12px;
    }

    .top-nav ul {
        gap: 4px;
        flex-wrap: wrap;
    }

    .top-nav a {
        padding: 6px 14px;
        font-size: 13px;
    }

    header h1 {
        font-size: 1.4em;
    }

    .subtitle {
        font-size: 0.85em;
    }

    .info-header h2 {
        font-size: 1.3em;
    }

    /* 统计面板小屏幕 */
    .stats-panel {
        grid-template-columns: 1fr;
    }

    /* 小屏幕内容页面优化 */
    .content-section {
        padding: 12px;
    }

    .content-section h2 {
        font-size: 1.1em;
    }

    .content-section ul {
        margin-left: 16px;
    }

    .back-link a {
        padding: 8px 20px;
        font-size: 14px;
    }

    /* 语言切换器小屏幕 */
    .language-switcher button {
        padding: 6px 12px;
        font-size: 12px;
    }
}

/* FAQ页面样式 */
.faq-item {
    margin-bottom: 30px;
    padding: 25px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid #1877f2;
}

.faq-item h2 {
    color: #1c1e21;
    font-size: 1.2em;
    margin-bottom: 15px;
}

.faq-item p {
    color: #444;
    margin-bottom: 12px;
    line-height: 1.8;
}

.faq-item ul, .faq-item ol {
    margin-left: 20px;
    margin-bottom: 15px;
}

.faq-item li {
    margin-bottom: 8px;
    color: #444;
}

/* 知识科普页面样式 */
.toc {
    background: #f0f7ff;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    border: 1px solid #cce5ff;
}

.toc h3 {
    color: #1877f2;
    margin-bottom: 15px;
    font-size: 1.1em;
}

.toc ul {
    list-style: none;
    margin-left: 0;
}

.toc li {
    margin-bottom: 8px;
}

.toc a {
    color: #1877f2;
    text-decoration: none;
    display: block;
    padding: 5px 0;
    transition: color 0.2s;
}

.toc a:hover {
    color: #0056b3;
    text-decoration: underline;
}

article {
    margin-bottom: 40px;
    padding-bottom: 30px;
    border-bottom: 1px solid #e0e0e0;
}

article:last-of-type {
    border-bottom: none;
}

article h2 {
    color: #1c1e21;
    font-size: 1.5em;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #1877f2;
}

article h3 {
    color: #333;
    font-size: 1.2em;
    margin: 25px 0 15px;
}

article p {
    color: #444;
    line-height: 1.8;
    margin-bottom: 15px;
}

article ul, article ol {
    margin-left: 25px;
    margin-bottom: 20px;
}

article li {
    margin-bottom: 10px;
    line-height: 1.6;
}

/* 对比表格 */
.comparison-table {
    overflow-x: auto;
    margin: 20px 0;
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.comparison-table th,
.comparison-table td {
    padding: 12px 15px;
    text-align: left;
    border: 1px solid #e0e0e0;
}

.comparison-table th {
    background: #1877f2;
    color: white;
    font-weight: 600;
}

.comparison-table tr:nth-child(even) {
    background: #f8f9fa;
}

.comparison-table tr:hover {
    background: #e7f3ff;
}

/* 知识页面底部 */
.knowledge-footer {
    background: linear-gradient(135deg, #e7f3ff 0%, #f0f7ff 100%);
    padding: 30px;
    border-radius: 8px;
    margin-top: 30px;
}

.knowledge-footer h3 {
    color: #1877f2;
    margin-bottom: 15px;
}

.knowledge-footer ul {
    margin-left: 20px;
}

.knowledge-footer a {
    color: #1877f2;
}

/* 返回链接 */
.back-link {
    text-align: center;
    margin: 30px 0;
}

.back-link a {
    display: inline-block;
    padding: 12px 30px;
    background: #1877f2;
    color: white;
    text-decoration: none;
    border-radius: 25px;
    font-weight: 500;
    transition: all 0.2s;
}

.back-link a:hover {
    background: #166fe5;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(24, 119, 242, 0.3);
}