:root {
    --dark-gray: #2c3e3f;
    --deep-blue: #1a4d8c;
    --white: #ffffff;
    --snow-white: #f5f7fa;
    --border-light: #e0e4e8;
    --text-gray: #4a5b5c;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--snow-white);
    color: var(--dark-gray);
}

/* 导航栏 */
.navbar {
    background-color: var(--white);
    border-bottom: 1px solid var(--border-light);
    padding: 1rem 2rem;
    display: flex;
    gap: 2rem;
    align-items: center;
}

    .navbar a {
        color: var(--dark-gray);
        text-decoration: none;
        font-weight: 500;
        padding: 0.5rem 1rem;
        border-radius: 4px;
        transition: all 0.2s;
    }

        .navbar a:hover {
            background-color: var(--snow-white);
            color: var(--deep-blue);
        }

        .navbar a.active {
            background-color: var(--deep-blue);
            color: white;
        }

/* 容器 */
.container {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 2rem;
}

/* 两列布局 */
.two-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

/* 卡片 */
.card {
    background: var(--white);
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    border: 1px solid var(--border-light);
    overflow: hidden;
}

.card-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-light);
    font-weight: 600;
    background-color: var(--snow-white);
    color: var(--deep-blue);
}

.card-body {
    padding: 1.5rem;
}

/* 聊天区域 */
.chat-input-area {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.5rem;
}

    .chat-input-area input {
        flex: 1;
        padding: 0.75rem;
        border: 1px solid var(--border-light);
        border-radius: 4px;
        font-size: 0.9rem;
    }

    .chat-input-area button {
        background-color: var(--deep-blue);
        color: white;
        border: none;
        padding: 0 1.25rem;
        border-radius: 4px;
        cursor: pointer;
        transition: background 0.2s;
    }

        .chat-input-area button:hover {
            background-color: #0f3b6e;
        }

.message-list {
    max-height: 300px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.message-item {
    padding: 0.75rem;
    background-color: var(--snow-white);
    border-radius: 8px;
    font-size: 0.9rem;
    border-left: 3px solid var(--deep-blue);
}

.message-time {
    font-size: 0.7rem;
    color: var(--text-gray);
    margin-bottom: 0.25rem;
}

.message-text {
    word-break: break-word;
}

/* 地图容器 */
#map {
    height: 70vh;
    width: 90%;
    background-color: #eaeef2;
    border-radius: 8px;
    border: 1px solid var(--border-light);
}

/* 按钮 */
.btn {
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-light);
    background: white;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
}

.btn-primary {
    background-color: var(--deep-blue);
    border-color: var(--deep-blue);
    color: white;
}

/* 呼吸灯动画 */
.breathing-wrapper {
    animation: breathing 1.5s ease-in-out infinite;
    display: inline-block;
    border-radius: 50%;
}

@keyframes breathing {
    0% {
        box-shadow: 0 0 0 0 rgba(255, 0, 0, 0.7);
    }

    70% {
        box-shadow: 0 0 0 12px rgba(255, 0, 0, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(255, 0, 0, 0);
    }
}

.legend-color {
    display: inline-block;
    width: 20px;
    height: 12px;
    margin-right: 5px;
}