body { margin: 0; overflow: hidden; background-color: #000; font-family: 'Microsoft YaHei', sans-serif; }
canvas { display: block; }

/* UI 覆盖层 */
#ui-container {
    position: absolute;
    top: 20px;
    left: 20px;
    color: white;
    z-index: 10;
    background: rgba(0, 20, 40, 0.7);
    padding: 15px;
    border-radius: 8px;
    border: 1px solid rgba(0, 200, 255, 0.3);
    backdrop-filter: blur(5px);
    max-height: 90vh;
    overflow: hidden;
    width: 260px;
    max-width: calc(100vw - 40px);
    display: flex;
    flex-direction: column;
    box-sizing: border-box;
}

h1 { margin: 0 0 10px 0; font-size: 1.2rem; text-transform: uppercase; letter-spacing: 2px; color: #00d2ff; }
p { margin: 5px 0; font-size: 0.9rem; color: #aaa; }

.ui-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 10px;
}
.ui-header h1 { margin: 0; }
.ui-toggle {
    padding: 4px 10px;
    font-size: 0.75rem;
    text-align: center;
    border-radius: 999px;
    white-space: nowrap;
}
.ui-body {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
}
#ui-container.collapsed {
    width: auto;
    max-height: none;
    padding: 10px 12px;
}
#ui-container.collapsed .ui-header { margin-bottom: 0; }
#ui-container.collapsed .ui-body { display: none; }

@media (max-width: 768px), (max-height: 640px) {
    #ui-container {
        top: 10px;
        left: 10px;
        max-width: calc(100vw - 20px);
    }
}

.btn-group { display: flex; flex-direction: column; gap: 8px; margin-top: 10px; }
button {
    background: rgba(0, 200, 255, 0.1);
    border: 1px solid #00d2ff;
    color: #00d2ff;
    padding: 8px 12px;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 0.9rem;
    border-radius: 4px;
    text-align: left;
}
button:hover { background: #00d2ff; color: #000; }

/* 管理员按钮 */
#admin-btn {
    margin-top: 15px;
    border: 1px dashed #666;
    color: #888;
    font-size: 0.8rem;
    text-align: center;
    padding: 5px;
}
#admin-btn:hover { border-color: #00d2ff; color: #00d2ff; }

/* 速度控制滑条样式 */
.control-group {
    margin-top: 15px;
    border-top: 1px solid rgba(255,255,255,0.2);
    padding-top: 10px;
}
.control-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    color: #00d2ff;
    margin-bottom: 5px;
}
input[type=range] {
    width: 100%;
    cursor: pointer;
}

/* 行星标签样式 */
.planet-label {
    position: absolute;
    color: white;
    font-size: 12px;
    pointer-events: auto;
    cursor: pointer;
    text-shadow: 0 0 4px #000;
    background: rgba(0,0,0,0.5);
    padding: 2px 6px;
    border-radius: 4px;
    transform: translate(-50%, -150%);
    white-space: nowrap;
    text-align: center;
    opacity: 0.8;
    transition: all 0.2s;
    user-select: none;
}
.planet-label:hover {
    transform: translate(-50%, -150%) scale(1.2);
    background: rgba(0, 100, 200, 0.7);
    z-index: 100;
    opacity: 1 !important;
}

.star-label {
    font-size: 16px;
    font-weight: bold;
    color: #ffeb3b;
    background: none;
    text-shadow: 0 0 10px #000;
    pointer-events: auto;
    cursor: pointer;
}
.star-label:hover {
    transform: translate(-50%, -150%) scale(1.1);
    color: #fff;
}

/* 轨道半径标签样式 */
.orbit-label {
    position: absolute;
    color: #88aaff;
    font-size: 10px;
    pointer-events: none;
    text-shadow: 0 0 2px #000;
    opacity: 0.6;
    transform: translate(-50%, -50%);
    font-family: 'Consolas', monospace;
}
/* 质心标签样式 */
.barycenter-label {
    position: absolute;
    color: #00ff00;
    font-size: 10px;
    pointer-events: none;
    text-shadow: 0 0 2px #000;
    opacity: 0.8;
    transform: translate(-50%, -50%);
    border: 1px solid rgba(0, 255, 0, 0.3);
    background: rgba(0, 20, 0, 0.5);
    padding: 1px 3px;
    border-radius: 2px;
}
/* 系统总标签样式 */
.system-label {
    position: absolute;
    color: #ffcc00;
    font-size: 14px;
    font-weight: bold;
    pointer-events: auto;
    cursor: pointer;
    text-shadow: 0 0 5px #000;
    transform: translate(-50%, -150%);
    background: rgba(0, 0, 0, 0.7);
    padding: 6px 10px;
    border: 1px solid rgba(255, 204, 0, 0.6);
    border-radius: 4px;
    z-index: 5;
    text-align: center;
    white-space: nowrap;
    transition: all 0.2s;
}
.system-label:hover {
    transform: translate(-50%, -150%) scale(1.1);
    background: rgba(50, 50, 0, 0.9);
    border-color: #ffeb3b;
    z-index: 101;
}
.system-sub {
    display: block;
    font-size: 11px;
    color: #bbb;
    font-weight: normal;
    margin-top: 2px;
}

#loading {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    color: #00d2ff;
    font-size: 24px;
    z-index: 100;
    pointer-events: none;
    transition: opacity 0.5s;
}

/* --- 信息弹窗与模糊遮罩 --- */
#blur-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 999;
    display: none;
    opacity: 0;
    transition: opacity 0.4s ease;
}
#info-modal {
    position: fixed;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    width: 500px;
    max-width: 90%;
    max-height: 85vh;
    overflow-y: auto;
    background: rgba(12, 25, 40, 0.9);
    border: 1px solid #00d2ff;
    box-shadow: 0 0 30px rgba(0, 210, 255, 0.2);
    color: #eee;
    padding: 25px;
    border-radius: 12px;
    z-index: 1000;
    display: none;
    opacity: 0;
    transition: all 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28);
    font-family: 'Microsoft YaHei', sans-serif;
}
#info-modal.active {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
}
#info-modal h2 {
    margin-top: 0;
    color: #00d2ff;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    padding-bottom: 15px;
    font-size: 1.5rem;
    letter-spacing: 1px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
#info-modal .content {
    margin: 20px 0;
    line-height: 1.6;
    font-size: 0.95rem;
    color: #ccc;
}
#info-modal .close-btn {
    position: absolute;
    top: 15px; right: 20px;
    font-size: 28px;
    cursor: pointer;
    color: #666;
    transition: color 0.3s;
    line-height: 1;
}
#info-modal .close-btn:hover { color: #fff; }

/* --- 登录弹窗 --- */
#login-modal {
    position: fixed;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    background: rgba(0, 20, 40, 0.95);
    border: 1px solid #00d2ff;
    padding: 30px;
    z-index: 1100;
    border-radius: 10px;
    text-align: center;
    display: none;
    box-shadow: 0 0 20px rgba(0,0,0,0.8);
}
#login-modal input {
    background: rgba(0,0,0,0.5);
    border: 1px solid #444;
    color: white;
    padding: 8px;
    margin: 10px 0;
    border-radius: 4px;
    width: 200px;
}
#login-modal button {
    width: 100%;
    background: #00d2ff;
    color: #000;
    font-weight: bold;
}

/* --- 编辑器样式 --- */
.edit-mode textarea {
    width: 100%;
    height: 150px;
    background: rgba(0,0,0,0.3);
    border: 1px solid #444;
    color: #fff;
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 4px;
    resize: vertical;
}
.drop-zone {
    border: 2px dashed #444;
    padding: 20px;
    text-align: center;
    color: #888;
    margin: 10px 0;
    border-radius: 6px;
    transition: all 0.3s;
    background: rgba(0,0,0,0.2);
}
.drop-zone.dragover {
    border-color: #00d2ff;
    background: rgba(0, 210, 255, 0.1);
    color: #fff;
}
.media-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 10px;
}
.media-item {
    width: 80px;
    height: 80px;
    object-fit: cover;
    border-radius: 4px;
    border: 1px solid #444;
}
.document-item {
    width: 80px;
    height: 80px;
    border-radius: 4px;
    border: 1px solid #444;
    background: rgba(0,0,0,0.4);
    color: #00d2ff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 11px;
    text-align: center;
    padding: 6px;
    text-decoration: none;
}
.document-item:hover {
    background: rgba(0, 100, 200, 0.4);
    color: #fff;
}
.audio-item {
    width: 100%;
    max-width: 180px;
}
.link-input-group {
    display: flex;
    gap: 5px;
    margin-bottom: 5px;
}
.link-input-group input {
    background: rgba(0,0,0,0.3);
    border: 1px solid #444;
    color: white;
    padding: 5px;
    flex: 1;
    border-radius: 4px;
}
.admin-badge {
    background: #ff3300;
    color: white;
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: 4px;
    vertical-align: middle;
    margin-left: 10px;
}
.view-media img, .view-media video {
    max-width: 100%;
    border-radius: 8px;
    margin-top: 10px;
    border: 1px solid #333;
}
.view-links a {
    display: block;
    color: #00d2ff;
    text-decoration: none;
    margin: 5px 0;
}
.view-links a:hover { text-decoration: underline; }