:root {
    --primary: #4A90E2;
    --primary-dark: #357ABD;
    --bg-panel: #161e2b;
    --bg-header-tabs: #0f141e;
    --bg-item: #1d2636;
    --border: rgba(255, 255, 255, 0.08);
    --text-main: #cbd5e1;
    --text-dim: #94a3b8;
    --transition: all 0.2s ease;
}

*, *::before, *::after {
    box-sizing: border-box;
}

button, .btn {
    padding: 12px 24px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(52, 152, 219, 0.3);
}

.main-scroll-area {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    width: 100%;
    position: relative;
    scrollbar-width: thin;
    scrollbar-color: var(--primary) rgba(0,0,0,0.2);
}

.main-scroll-area::-webkit-scrollbar {
    width: 8px;
}

.main-scroll-area::-webkit-scrollbar-track {
    background: rgba(15, 23, 42, 0.5);
}

.main-scroll-area::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

.main-scroll-area::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}