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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
    background: #18191a;
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
    color: #e4e6eb;
}

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

/* 顶部导航样式 */
.top-nav {
    background: #242526;
    border-radius: 8px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    margin-bottom: 20px;
    padding: 12px 24px;
}

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

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

/* 语言切换器样式 */
.lang-switcher {
    display: flex;
    gap: 8px;
}

.lang-switcher button {
    padding: 6px 12px;
    font-size: 13px;
}

.lang-switcher button.active {
    background: #1877f2 !important;
    color: white !important;
}

/* 地图容器样式 */
#map {
    width: 100%;
    height: 300px;
    border-radius: 8px;
    margin-top: 12px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* 旗帜样式 */
.flag {
    display: inline-block;
    width: 24px;
    height: 16px;
    margin-right: 8px;
    vertical-align: middle;
    border-radius: 2px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    background-size: cover;
    background-position: center;
}

.top-nav li {
    margin: 0;
}

.top-nav a {
    display: block;
    padding: 10px 20px;
    color: #e4e6eb;
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    border-radius: 6px;
    transition: all 0.2s;
    position: relative;
}

.top-nav a:hover {
    background: #3a3b3c;
    color: #1877f2;
}

.top-nav a.active {
    background: #1877f2;
    color: white;
    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: #242526;
    padding: 30px 20px;
    margin-bottom: 20px;
    border-radius: 8px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

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

.subtitle {
    font-size: 0.95em;
    color: #b0b3b8;
    font-weight: 400;
}

/* 搜索区域 */
.search-section {
    background: #242526;
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    margin-bottom: 20px;
}

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

#ipInput {
    flex: 1;
    padding: 10px 12px;
    font-size: 15px;
    border: 1px solid #3a3b3c;
    border-radius: 6px;
    outline: none;
    transition: all 0.2s;
    background: #3a3b3c;
    color: #e4e6eb;
}

#ipInput:focus {
    background: #3a3b3c;
    border-color: #1877f2;
    box-shadow: 0 0 0 2px rgba(24, 119, 242, 0.2);
}

#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: #3a3b3c;
    color: #e4e6eb;
}

.btn-secondary:hover {
    background: #4e4f50;
}

.btn-secondary:active {
    background: #606162;
}

/* 加载动画 */
.loading {
    background: #242526;
    border-radius: 8px;
    padding: 32px;
    text-align: center;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    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: #3f1d1d;
    border: 1px solid #f02849;
    color: #ff8c82;
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 20px;
    text-align: center;
    font-size: 0.9em;
}

/* IP信息显示 */
.ip-info {
    background: #242526;
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    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 #3a3b3c;
}

.info-header h2 {
    color: #e4e6eb;
    font-size: 1.6em;
    font-weight: 600;
}

.ip-type {
    padding: 6px 12px;
    background: #1a3d5d;
    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: #3a3b3c;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    transition: all 0.2s;
}

.info-item:hover {
    background: #4e4f50;
}

.info-label {
    font-size: 0.85em;
    color: #b0b3b8;
    font-weight: 600;
}

.info-value {
    font-size: 1em;
    color: #e4e6eb;
    font-weight: 500;
    word-break: break-all;
}

/* 地图容器 */
.map-container {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid #3a3b3c;
}

.map-container h3 {
    color: #e4e6eb;
    margin-bottom: 12px;
    font-size: 1.2em;
    font-weight: 600;
}

.map-link {
    padding: 12px;
    background: #3a3b3c;
    border-radius: 6px;
    font-size: 0.9em;
}

.map-link p {
    color: #b0b3b8;
    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: #242526;
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    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: #b0b3b8;
    font-size: 0.9em;
    line-height: 1.8;
}

.instructions li {
    padding: 4px 0;
    color: #e4e6eb;
}

.api-notice {
    background: #3d3716;
    border: 1px solid #ffc107;
    padding: 12px;
    border-radius: 6px;
    font-size: 0.9em;
    color: #ffd43b;
}

.api-notice strong {
    color: #e4e6eb;
}

.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: #b0b3b8;
    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: #242526;
    border-radius: 8px;
    padding: 24px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    margin-bottom: 20px;
}

.content-section p {
    color: #e4e6eb;
    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: #e4e6eb;
    margin: 16px 0 12px 0;
    font-size: 1.1em;
    font-weight: 600;
}

.content-section h4 {
    color: #e4e6eb;
    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: #e4e6eb;
    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: #b0b3b8;
    font-size: 0.9em;
    margin-bottom: 24px;
    padding: 12px;
    background: #3a3b3c;
    border-radius: 6px;
}

.policy-notice,
.disclaimer {
    background: #3d3716;
    border: 1px solid #ffc107;
    padding: 16px;
    border-radius: 6px;
    margin: 16px 0;
}

.policy-notice p,
.disclaimer ul {
    color: #ffd43b;
    margin: 0;
}

.policy-notice strong {
    color: #e4e6eb;
}

.back-link {
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid #3a3b3c;
    text-align: center;
}

.back-link a {
    display: inline-block;
    padding: 10px 24px;
    background: #3a3b3c;
    color: #e4e6eb;
    text-decoration: none;
    border-radius: 6px;
    font-weight: 600;
    transition: all 0.2s;
}

.back-link a:hover {
    background: #4e4f50;
}

/* 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: #3a3b3c;
    border-radius: 8px;
    text-align: center;
    transition: all 0.2s;
}

.feature-item:hover {
    background: #4e4f50;
    transform: translateY(-2px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.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: #b0b3b8;
    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: #3a3b3c;
    border-radius: 6px;
    margin-bottom: 12px;
}

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

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

.changelog-item {
    padding: 16px;
    background: #3a3b3c;
    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;
}

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

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

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

    .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;
    }

    .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;
    }

    /* 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;
    }
}