:root {
    --bg-color: #0f172a;
    --panel-bg: rgba(30, 41, 59, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --success-color: #10b981;
    --success-hover: #059669;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --item-bg: rgba(255, 255, 255, 0.05);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

.background-blobs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.5;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: #3b82f6;
    animation: float 10s ease-in-out infinite;
}

.blob-2 {
    bottom: -10%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: #8b5cf6;
    animation: float 12s ease-in-out infinite reverse;
}

@keyframes float {
    0% { transform: translateY(0) scale(1); }
    50% { transform: translateY(50px) scale(1.1); }
    100% { transform: translateY(0) scale(1); }
}

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #60a5fa, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

.panel {
    background: var(--panel-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.panel-footer {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    gap: 1rem;
}

.btn {
    padding: 0.6rem 1.2rem;
    border-radius: 8px;
    border: none;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    color: white;
}

.btn-small {
    padding: 0.4rem 0.8rem;
    font-size: 0.85rem;
}

.btn-primary { background-color: var(--primary-color); }
.btn-primary:hover { background-color: var(--primary-hover); transform: translateY(-2px); }

.btn-secondary { background-color: transparent; border: 1px solid var(--border-color); }
.btn-secondary:hover { background-color: rgba(255, 255, 255, 0.1); }

.btn-success { background-color: var(--success-color); }
.btn-success:hover { background-color: var(--success-hover); transform: translateY(-2px); }

.btn-danger { background-color: transparent; border: 1px solid var(--danger-color); color: #fca5a5; }
.btn-danger:hover { background-color: var(--danger-color); color: white; }

.tree-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tree-item {
    background: var(--item-bg);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1rem;
    transition: all 0.2s;
}

.item-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.item-name-input {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-size: 1rem;
    width: 250px;
    transition: border-color 0.2s;
}

.item-name-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.item-actions {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.item-id-badge {
    font-family: monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
    background: rgba(0,0,0,0.3);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
}

.item-children {
    margin-top: 1rem;
    margin-left: 2rem;
    padding-left: 1rem;
    border-left: 2px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.status-indicator {
    font-size: 0.9rem;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.status-success {
    color: var(--success-color);
    opacity: 1;
}

.status-error {
    color: #fca5a5;
    opacity: 1;
}