:root {
    --primary-color: #00f3ff;
    --secondary-color: #0066ff;
    --glass-bg: rgba(10, 20, 40, 0.75);
    --glass-border: rgba(0, 243, 255, 0.3);
    --text-main: #ffffff;
    --text-dim: #a0b0c0;
    --font-tech: 'Rajdhani', sans-serif;
    --font-body: 'Inter', sans-serif;
}

body {
    margin: 0;
    overflow: hidden;
    background-color: #000;
    font-family: var(--font-body);
    color: var(--text-main);
    user-select: none;
}

canvas {
    display: block;
    outline: none;
}

#ui-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 30px;
    box-sizing: border-box;
}

/* --- HUD Header (Top Bar) --- */
.hud-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    width: 100%;
    pointer-events: none; /* 让中间区域可穿透 */
}

/* --- HUD Buttons --- */
.hud-btn {
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid var(--glass-border);
    color: var(--primary-color);
    padding: 10px 24px;
    font-family: var(--font-tech);
    font-weight: 700;
    font-size: 16px;
    letter-spacing: 2px;
    text-transform: uppercase;
    cursor: pointer;
    pointer-events: auto;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    border-radius: 4px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 0 10px rgba(0, 243, 255, 0.1);
}

.hud-btn:hover {
    background: rgba(0, 243, 255, 0.15);
    box-shadow: 0 0 20px rgba(0, 243, 255, 0.4);
    text-shadow: 0 0 8px var(--primary-color);
    border-color: var(--primary-color);
}

.hud-btn.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(-20px);
}

/* 激活状态的按钮 (例如音乐开启) */
.hud-btn.active {
    background: rgba(0, 243, 255, 0.2);
    box-shadow: 0 0 15px rgba(0, 243, 255, 0.3);
    border-color: var(--primary-color);
}

/* --- Info Panel --- */
.glass-panel {
    position: absolute;
    top: 100px;
    right: 40px;
    width: 400px;
    max-height: 80vh;
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border: 1px solid var(--glass-border);
    border-left: 4px solid var(--primary-color);
    border-radius: 8px;
    padding: 0;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), 0 0 20px rgba(0, 243, 255, 0.1);
    pointer-events: auto;
    overflow: hidden;
    transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    transform-origin: top right;
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.glass-panel.hidden {
    opacity: 0;
    transform: scale(0.95) translateX(20px);
    pointer-events: none;
}

.panel-header {
    padding: 20px 25px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: linear-gradient(90deg, rgba(0, 243, 255, 0.1), transparent);
}

#info-title {
    margin: 0;
    font-family: var(--font-tech);
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--text-main);
    text-shadow: 0 0 10px rgba(0, 243, 255, 0.5);
    transition: opacity 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    transform: translateX(0);
    opacity: 1;
}

#info-close {
    background: none;
    border: none;
    color: var(--text-dim);
    font-size: 24px;
    cursor: pointer;
    transition: color 0.2s;
}

#info-close:hover {
    color: var(--primary-color);
}

#info-desc {
    padding: 25px;
    overflow-y: auto;
    font-size: 14px;
    line-height: 1.6;
    color: #d0d0d0;
    transition: opacity 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
    transform: translateX(0);
    opacity: 1;
}

/* 向左淡出 */
.content-fading-out {
    opacity: 0 !important;
    transform: translateX(-30px) !important;
}

/* 在右侧准备 (用于瞬间复位) */
.content-fading-in {
    opacity: 0 !important;
    transform: translateX(30px) !important;
    transition: none !important; /* 瞬间移动，不要动画 */
}

/* --- Mobile Responsive Design --- */
@media (max-width: 768px) {
    /* 0. 全局容器调整：减小内边距，让内容更靠边 */
    #ui-container {
        padding: 10px;
    }

    /* 1. 顶部栏调整：更紧凑，并排显示 */
    .hud-header {
        padding: 0; /* 移除 header 自身的 padding，完全靠 #ui-container 控制 */
        flex-direction: row; /* 改为横向排列，让按钮并排 */
        align-items: center;
        justify-content: space-between;
        gap: 5px;
        width: 100%;
    }

    .header-controls {
        gap: 5px !important;
    }

    .hud-btn {
        padding: 6px 10px; /* 缩小按钮内边距 */
        font-size: 12px; /* 缩小字体 */
        white-space: nowrap;
    }

    /* 2. 信息面板：改为底部抽屉，增加高度 */
    .glass-panel {
        top: auto;
        bottom: 0;
        right: 0;
        left: 0;
        width: 100%;
        max-height: 80vh; /* 增加高度，从 50vh 改为 80vh */
        border-radius: 20px 20px 0 0; /* 只有上面有圆角 */
        border-left: none;
        border-top: 4px solid var(--primary-color);
        transform-origin: bottom center;
        display: flex;
        flex-direction: column;

        /* 增加透明度，让背景可见 */
        background: rgba(10, 20, 40, 0.5);
        backdrop-filter: blur(8px) saturate(180%);
        -webkit-backdrop-filter: blur(8px) saturate(180%);

        z-index: 100; /* 确保在普通 UI 之上，但在拍照按钮之下 */
    }

    .glass-panel.hidden {
        transform: translateY(100%); /* 向下隐藏 */
        opacity: 0;
    }

    /* 确保描述区域可以滚动且不被遮挡 */
    #info-desc {
        flex: 1;
        overflow-y: auto;
        padding-bottom: 80px; /* 底部增加更多留白，防止被拍照按钮遮挡 */
    }

    /* 3. 底部控制栏调整 */
    .hud-footer {
        padding: 0;
        flex-direction: column-reverse; /* 提示语在按钮上面 */
        align-items: center;
        gap: 10px;
        margin-bottom: 60px; /* 给拍照按钮留出空间 */
    }

    #controls-hint {
        font-size: 11px;
        padding: 4px 10px;
        margin-bottom: 5px; /* 给面板留出一点空间，防止被误触 */
        opacity: 0.7;
    }

    /* 4. 调整内容过渡动画方向 (改为上下) */
    .content-fading-out {
        transform: translateY(-20px) !important;
    }
    .content-fading-in {
        transform: translateY(20px) !important;
    }

    /* 5. 拍照按钮调整 */
    #camera-container {
        bottom: 20px; /* 靠下放置 */
        z-index: 1001; /* 确保在抽屉之上 */
    }
}

/* --- Data Grid --- */
.info-grid {
    display: grid;
    gap: 8px;
    margin-bottom: 25px;
}

.info-row {
    display: flex;
    justify-content: space-between;
    padding: 8px 12px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 4px;
    border-left: 2px solid transparent;
    transition: background 0.2s;
}

.info-row:hover {
    background: rgba(255, 255, 255, 0.08);
    border-left-color: var(--primary-color);
}

.info-label {
    font-family: var(--font-body);
    color: var(--primary-color);
    font-weight: 600;
    font-size: 13px;
}

.info-value {
    font-family: var(--font-body);
    font-weight: 400;
    color: #fff;
    text-align: right;
}

.info-text {
    font-family: var(--font-body);
    color: #ccc;
    line-height: 1.8;
    font-size: 14px;
    text-align: justify;
}

/* --- Scrollbar --- */
#info-desc::-webkit-scrollbar {
    width: 4px;
}
#info-desc::-webkit-scrollbar-track {
    background: rgba(0,0,0,0.3);
}
#info-desc::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 2px;
}

/* --- Footer Controls --- */
.hud-footer {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    width: 100%;
    pointer-events: none;
}

.hud-footer > * {
    pointer-events: auto;
}

#controls-hint {
    font-family: var(--font-tech);
    color: var(--text-dim);
    font-size: 14px;
    letter-spacing: 2px;
    background: rgba(0, 0, 0, 0.6);
    padding: 8px 16px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
}

.separator {
    color: var(--primary-color);
    margin: 0 10px;
}

/* --- Planet Labels --- */
.label {
    color: rgba(255, 255, 255, 0.85);
    font-family: var(--font-tech);
    font-weight: 600;
    font-size: 13px;
    letter-spacing: 1px;
    pointer-events: auto;
    background: none;
    border: none;
    padding: 4px 8px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.8);
    transition: opacity 0.3s, color 0.3s, text-shadow 0.3s;
    cursor: pointer;
}

.label:hover {
    color: var(--primary-color);
    text-shadow: 0 0 10px rgba(0, 243, 255, 0.8), 0 2px 4px rgba(0, 0, 0, 0.8);
}

/* --- Camera Button --- */
#camera-container {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    pointer-events: auto;
}

#camera-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
    outline: none;
}

#camera-btn:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: scale(1.1);
}

/* --- Mobile Responsive Design (Landscape) --- */
@media (max-height: 500px) and (orientation: landscape) {
    /* 0. 全局容器调整 */
    #ui-container {
        padding: 10px 20px; /* 左右留白稍微多一点 */
    }

    /* 1. 顶部栏调整：缩小按钮 */
    .hud-header {
        align-items: flex-start;
    }

    .hud-btn {
        padding: 4px 12px; /* 极度压缩高度 */
        font-size: 11px; /* 缩小字体 */
        border-radius: 3px;
    }

    .header-controls {
        gap: 8px !important;
    }

    /* 2. 信息面板：右侧固定，全高 */
    .glass-panel {
        top: 0;
        right: 0;
        bottom: 0;
        width: 45%; /* 占据右侧接近一半 */
        max-width: 400px; /* 但不要太宽 */
        height: 100%; /* 占满高度 */
        max-height: 100vh;
        border-radius: 0; /* 移除圆角，贴边 */
        border-left: 1px solid var(--glass-border); /* 恢复左边框 */
        border-top: none;

        /* 增加透明度，让背景可见 */
        background: rgba(10, 20, 40, 0.6);
        backdrop-filter: blur(8px) saturate(180%);
        -webkit-backdrop-filter: blur(8px) saturate(180%);

        display: flex;
        flex-direction: column;
    }

    .glass-panel.hidden {
        transform: translateX(100%); /* 向右隐藏 */
        opacity: 0;
    }

    .panel-header {
        padding: 10px 15px; /* 压缩头部高度 */
    }

    #info-title {
        font-size: 18px; /* 缩小标题 */
    }

    #info-desc {
        padding: 10px 15px;
        flex: 1;
        overflow-y: auto; /* 确保可滚动 */
    }

    /* 3. 底部控制栏调整 */
    .hud-footer {
        margin-bottom: 0;
        align-items: flex-end;
    }

    #toggle-orbit {
        font-size: 11px;
        padding: 4px 12px;
    }

    #controls-hint {
        display: none; /* 横屏高度不够，隐藏提示语 */
    }

    /* 4. 拍照按钮调整 */
    #camera-container {
        bottom: 20px;
        left: auto; /* 取消居中 */
        right: 48%; /* 放在中间偏右一点，避开面板 */
        transform: translateX(50%);
    }

    #camera-btn {
        width: 40px;
        height: 40px;
    }
}